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Compare Revisions

• This comparison shows the changes necessary to convert path

  → /programs/develop/ktcc/trunk/source/tccelf.c @ 6428

  → /programs/develop/ktcc/trunk/source/tccelf.c @ 6429

  ↔ Reverse comparison

• Compare Path:	Rev

  With Path:	Rev

Regard whitespace Rev 6428 → Rev 6429

/programs/develop/ktcc/trunk/source/tccelf.c
18,7 → 18,15
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
static int put_elf_str(Section *s, const char *sym)
#include "tcc.h"
/* Define this to get some debug output during relocation processing. */
#undef DEBUG_RELOC
/* XXX: avoid static variable */
static int new_undef_sym = 0; /* Is there a new undefined sym since last new_undef_sym() */
ST_FUNC int put_elf_str(Section *s, const char *sym)
{
int offset, len;
char *ptr;
49,12 → 57,12
/* NOTE: we do factorize the hash table code to go faster */
static void rebuild_hash(Section *s, unsigned int nb_buckets)
{
Elf32_Sym *sym;
ElfW(Sym) *sym;
int *ptr, *hash, nb_syms, sym_index, h;
char *strtab;
unsigned char *strtab;
strtab = s->link->data;
nb_syms = s->data_offset / sizeof(Elf32_Sym);
nb_syms = s->data_offset / sizeof(ElfW(Sym));
s->hash->data_offset = 0;
ptr = section_ptr_add(s->hash, (2 + nb_buckets + nb_syms) * sizeof(int));
65,9 → 73,9
memset(hash, 0, (nb_buckets + 1) * sizeof(int));
ptr += nb_buckets + 1;
sym = (Elf32_Sym *)s->data + 1;
sym = (ElfW(Sym) *)s->data + 1;
for(sym_index = 1; sym_index < nb_syms; sym_index++) {
if (ELF32_ST_BIND(sym->st_info) != STB_LOCAL) {
if (ELFW(ST_BIND)(sym->st_info) != STB_LOCAL) {
h = elf_hash(strtab + sym->st_name) % nb_buckets;
*ptr = hash[h];
hash[h] = sym_index;
80,16 → 88,15
}
/* return the symbol number */
static int put_elf_sym(Section *s,
unsigned long value, unsigned long size,
ST_FUNC int put_elf_sym(Section *s, addr_t value, unsigned long size,
int info, int other, int shndx, const char *name)
{
int name_offset, sym_index;
int nbuckets, h;
Elf32_Sym *sym;
ElfW(Sym) *sym;
Section *hs;
sym = section_ptr_add(s, sizeof(Elf32_Sym));
sym = section_ptr_add(s, sizeof(ElfW(Sym)));
if (name)
name_offset = put_elf_str(s->link, name);
else
101,7 → 108,7
sym->st_info = info;
sym->st_other = other;
sym->st_shndx = shndx;
sym_index = sym - (Elf32_Sym *)s->data;
sym_index = sym - (ElfW(Sym) *)s->data;
hs = s->hash;
if (hs) {
int *ptr, *base;
108,10 → 115,10
ptr = section_ptr_add(hs, sizeof(int));
base = (int *)hs->data;
/* only add global or weak symbols */
if (ELF32_ST_BIND(info) != STB_LOCAL) {
if (ELFW(ST_BIND)(info) != STB_LOCAL) {
/* add another hashing entry */
nbuckets = base[0];
h = elf_hash(name) % nbuckets;
h = elf_hash((unsigned char *) name) % nbuckets;
*ptr = base[2 + h];
base[2 + h] = sym_index;
base[1]++;
130,9 → 137,9
/* find global ELF symbol 'name' and return its index. Return 0 if not
found. */
static int find_elf_sym(Section *s, const char *name)
ST_FUNC int find_elf_sym(Section *s, const char *name)
{
Elf32_Sym *sym;
ElfW(Sym) *sym;
Section *hs;
int nbuckets, sym_index, h;
const char *name1;
141,11 → 148,11
if (!hs)
return 0;
nbuckets = ((int *)hs->data)[0];
h = elf_hash(name) % nbuckets;
h = elf_hash((unsigned char *) name) % nbuckets;
sym_index = ((int *)hs->data)[2 + h];
while (sym_index != 0) {
sym = &((Elf32_Sym *)s->data)[sym_index];
name1 = s->link->data + sym->st_name;
sym = &((ElfW(Sym) *)s->data)[sym_index];
name1 = (char *) s->link->data + sym->st_name;
if (!strcmp(name, name1))
return sym_index;
sym_index = ((int *)hs->data)[2 + nbuckets + sym_index];
153,38 → 160,48
return 0;
}
/* return elf symbol value or error */
int tcc_get_symbol(TCCState *s, unsigned long *pval, const char *name)
/* return elf symbol value, signal error if 'err' is nonzero */
ST_FUNC addr_t get_elf_sym_addr(TCCState *s, const char *name, int err)
{
int sym_index;
Elf32_Sym *sym;
ElfW(Sym) *sym;
sym_index = find_elf_sym(symtab_section, name);
if (!sym_index)
return -1;
sym = &((Elf32_Sym *)symtab_section->data)[sym_index];
*pval = sym->st_value;
sym_index = find_elf_sym(s->symtab, name);
sym = &((ElfW(Sym) *)s->symtab->data)[sym_index];
if (!sym_index || sym->st_shndx == SHN_UNDEF) {
if (err)
tcc_error("%s not defined", name);
return 0;
}
return sym->st_value;
}
void *tcc_get_symbol_err(TCCState *s, const char *name)
/* return elf symbol value */
LIBTCCAPI void *tcc_get_symbol(TCCState *s, const char *name)
{
unsigned long val;
if (tcc_get_symbol(s, &val, name) < 0)
error("%s not defined", name);
return (void *)val;
return (void*)(uintptr_t)get_elf_sym_addr(s, name, 0);
}
#if defined TCC_IS_NATIVE || defined TCC_TARGET_PE || defined TCC_TARGET_MEOS
/* return elf symbol value or error */
ST_FUNC void* tcc_get_symbol_err(TCCState *s, const char *name)
{
return (void*)(uintptr_t)get_elf_sym_addr(s, name, 1);
}
#endif
/* add an elf symbol : check if it is already defined and patch
it. Return symbol index. NOTE that sh_num can be SHN_UNDEF. */
static int add_elf_sym(Section *s, unsigned long value, unsigned long size,
ST_FUNC int add_elf_sym(Section *s, addr_t value, unsigned long size,
int info, int other, int sh_num, const char *name)
{
Elf32_Sym *esym;
ElfW(Sym) *esym;
int sym_bind, sym_index, sym_type, esym_bind;
unsigned char sym_vis, esym_vis, new_vis;
sym_bind = ELF32_ST_BIND(info);
sym_type = ELF32_ST_TYPE(info);
sym_bind = ELFW(ST_BIND)(info);
sym_type = ELFW(ST_TYPE)(info);
sym_vis = ELFW(ST_VISIBILITY)(other);
if (sym_bind != STB_LOCAL) {
/* we search global or weak symbols */
191,9 → 208,22
sym_index = find_elf_sym(s, name);
if (!sym_index)
goto do_def;
esym = &((Elf32_Sym *)s->data)[sym_index];
esym = &((ElfW(Sym) *)s->data)[sym_index];
if (esym->st_shndx != SHN_UNDEF) {
esym_bind = ELF32_ST_BIND(esym->st_info);
esym_bind = ELFW(ST_BIND)(esym->st_info);
/* propagate the most constraining visibility */
/* STV_DEFAULT(0)<STV_PROTECTED(3)<STV_HIDDEN(2)<STV_INTERNAL(1) */
esym_vis = ELFW(ST_VISIBILITY)(esym->st_other);
if (esym_vis == STV_DEFAULT) {
new_vis = sym_vis;
} else if (sym_vis == STV_DEFAULT) {
new_vis = esym_vis;
} else {
new_vis = (esym_vis < sym_vis) ? esym_vis : sym_vis;
}
esym->st_other = (esym->st_other & ~ELFW(ST_VISIBILITY)(-1))
| new_vis;
other = esym->st_other; /* in case we have to patch esym */
if (sh_num == SHN_UNDEF) {
/* ignore adding of undefined symbol if the
corresponding symbol is already defined */
202,19 → 232,29
goto do_patch;
} else if (sym_bind == STB_WEAK && esym_bind == STB_GLOBAL) {
/* weak is ignored if already global */
} else if (sym_bind == STB_WEAK && esym_bind == STB_WEAK) {
/* keep first-found weak definition, ignore subsequents */
} else if (sym_vis == STV_HIDDEN || sym_vis == STV_INTERNAL) {
/* ignore hidden symbols after */
} else if (esym->st_shndx == SHN_COMMON
&& (sh_num < SHN_LORESERVE || sh_num == SHN_COMMON)) {
/* gr: Happens with 'tcc ... -static tcctest.c' on e.g. Ubuntu 6.01
No idea if this is the correct solution ... */
goto do_patch;
} else if (s == tcc_state->dynsymtab_section) {
/* we accept that two DLL define the same symbol */
} else {
#if 0
printf("new_bind=%d new_shndx=%d last_bind=%d old_shndx=%d\n",
sym_bind, sh_num, esym_bind, esym->st_shndx);
printf("new_bind=%x new_shndx=%x new_vis=%x old_bind=%x old_shndx=%x old_vis=%x\n",
sym_bind, sh_num, new_vis, esym_bind, esym->st_shndx, esym_vis);
#endif
/* NOTE: we accept that two DLL define the same symbol */
if (s != tcc_state->dynsymtab_section)
error_noabort("'%s' defined twice", name);
tcc_error_noabort("'%s' defined twice... may be -fcommon is needed?", name);
}
} else {
do_patch:
esym->st_info = ELF32_ST_INFO(sym_bind, sym_type);
esym->st_info = ELFW(ST_INFO)(sym_bind, sym_type);
esym->st_shndx = sh_num;
new_undef_sym = 1;
esym->st_value = value;
esym->st_size = size;
esym->st_other = other;
222,7 → 262,7
} else {
do_def:
sym_index = put_elf_sym(s, value, size,
ELF32_ST_INFO(sym_bind, sym_type), other,
ELFW(ST_INFO)(sym_bind, sym_type), other,
sh_num, name);
}
return sym_index;
229,41 → 269,45
}
/* put relocation */
static void put_elf_reloc(Section *symtab, Section *s, unsigned long offset,
int type, int symbol)
ST_FUNC void put_elf_reloca(Section *symtab, Section *s, unsigned long offset,
int type, int symbol, addr_t addend)
{
char buf[256];
Section *sr;
Elf32_Rel *rel;
ElfW_Rel *rel;
sr = s->reloc;
if (!sr) {
/* if no relocation section, create it */
snprintf(buf, sizeof(buf), ".rel%s", s->name);
snprintf(buf, sizeof(buf), REL_SECTION_FMT, s->name);
/* if the symtab is allocated, then we consider the relocation
are also */
sr = new_section(tcc_state, buf, SHT_REL, symtab->sh_flags);
sr->sh_entsize = sizeof(Elf32_Rel);
sr = new_section(tcc_state, buf, SHT_RELX, symtab->sh_flags);
sr->sh_entsize = sizeof(ElfW_Rel);
sr->link = symtab;
sr->sh_info = s->sh_num;
s->reloc = sr;
}
rel = section_ptr_add(sr, sizeof(Elf32_Rel));
rel = section_ptr_add(sr, sizeof(ElfW_Rel));
rel->r_offset = offset;
rel->r_info = ELF32_R_INFO(symbol, type);
rel->r_info = ELFW(R_INFO)(symbol, type);
#if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
rel->r_addend = addend;
#else
if (addend)
tcc_error("non-zero addend on REL architecture");
#endif
}
ST_FUNC void put_elf_reloc(Section *symtab, Section *s, unsigned long offset,
int type, int symbol)
{
put_elf_reloca(symtab, s, offset, type, symbol, 0);
}
/* put stab debug information */
typedef struct {
unsigned long n_strx; /* index into string table of name */
unsigned char n_type; /* type of symbol */
unsigned char n_other; /* misc info (usually empty) */
unsigned short n_desc; /* description field */
unsigned long n_value; /* value of symbol */
} Stab_Sym;
static void put_stabs(const char *str, int type, int other, int desc,
ST_FUNC void put_stabs(const char *str, int type, int other, int desc,
unsigned long value)
{
Stab_Sym *sym;
280,25 → 324,31
sym->n_value = value;
}
static void put_stabs_r(const char *str, int type, int other, int desc,
ST_FUNC void put_stabs_r(const char *str, int type, int other, int desc,
unsigned long value, Section *sec, int sym_index)
{
put_stabs(str, type, other, desc, value);
put_elf_reloc(symtab_section, stab_section,
stab_section->data_offset - sizeof(unsigned long),
stab_section->data_offset - sizeof(unsigned int),
R_DATA_32, sym_index);
}
static void put_stabn(int type, int other, int desc, int value)
ST_FUNC void put_stabn(int type, int other, int desc, int value)
{
put_stabs(NULL, type, other, desc, value);
}
static void put_stabd(int type, int other, int desc)
ST_FUNC void put_stabd(int type, int other, int desc)
{
put_stabs(NULL, type, other, desc, 0);
}
/* Browse each elem of type <type> in section <sec> starting at elem <startoff>
using variable <elem> */
#define for_each_elem(sec, startoff, elem, type) \
for (elem = (type *) sec->data + startoff; \
elem < (type *) (sec->data + sec->data_offset); elem++)
/* In an ELF file symbol table, the local symbols must appear below
the global and weak ones. Since TCC cannot sort it while generating
the code, we must do it after. All the relocation tables are also
306,22 → 356,22
static void sort_syms(TCCState *s1, Section *s)
{
int *old_to_new_syms;
Elf32_Sym *new_syms;
ElfW(Sym) *new_syms;
int nb_syms, i;
Elf32_Sym *p, *q;
Elf32_Rel *rel, *rel_end;
ElfW(Sym) *p, *q;
ElfW_Rel *rel;
Section *sr;
int type, sym_index;
nb_syms = s->data_offset / sizeof(Elf32_Sym);
new_syms = tcc_malloc(nb_syms * sizeof(Elf32_Sym));
nb_syms = s->data_offset / sizeof(ElfW(Sym));
new_syms = tcc_malloc(nb_syms * sizeof(ElfW(Sym)));
old_to_new_syms = tcc_malloc(nb_syms * sizeof(int));
/* first pass for local symbols */
p = (Elf32_Sym *)s->data;
p = (ElfW(Sym) *)s->data;
q = new_syms;
for(i = 0; i < nb_syms; i++) {
if (ELF32_ST_BIND(p->st_info) == STB_LOCAL) {
if (ELFW(ST_BIND)(p->st_info) == STB_LOCAL) {
old_to_new_syms[i] = q - new_syms;
*q++ = *p;
}
331,9 → 381,9
s->sh_info = q - new_syms;
/* then second pass for non local symbols */
p = (Elf32_Sym *)s->data;
p = (ElfW(Sym) *)s->data;
for(i = 0; i < nb_syms; i++) {
if (ELF32_ST_BIND(p->st_info) != STB_LOCAL) {
if (ELFW(ST_BIND)(p->st_info) != STB_LOCAL) {
old_to_new_syms[i] = q - new_syms;
*q++ = *p;
}
341,21 → 391,18
}
/* we copy the new symbols to the old */
memcpy(s->data, new_syms, nb_syms * sizeof(Elf32_Sym));
memcpy(s->data, new_syms, nb_syms * sizeof(ElfW(Sym)));
tcc_free(new_syms);
/* now we modify all the relocations */
for(i = 1; i < s1->nb_sections; i++) {
sr = s1->sections[i];
if (sr->sh_type == SHT_REL && sr->link == s) {
rel_end = (Elf32_Rel *)(sr->data + sr->data_offset);
for(rel = (Elf32_Rel *)sr->data;
rel < rel_end;
rel++) {
sym_index = ELF32_R_SYM(rel->r_info);
type = ELF32_R_TYPE(rel->r_info);
if (sr->sh_type == SHT_RELX && sr->link == s) {
for_each_elem(sr, 0, rel, ElfW_Rel) {
sym_index = ELFW(R_SYM)(rel->r_info);
type = ELFW(R_TYPE)(rel->r_info);
sym_index = old_to_new_syms[sym_index];
rel->r_info = ELF32_R_INFO(sym_index, type);
rel->r_info = ELFW(R_INFO)(sym_index, type);
}
}
}
364,15 → 411,12
}
/* relocate common symbols in the .bss section */
static void relocate_common_syms(void)
ST_FUNC void relocate_common_syms(void)
{
Elf32_Sym *sym, *sym_end;
ElfW(Sym) *sym;
unsigned long offset, align;
sym_end = (Elf32_Sym *)(symtab_section->data + symtab_section->data_offset);
for(sym = (Elf32_Sym *)symtab_section->data + 1;
sym < sym_end;
sym++) {
for_each_elem(symtab_section, 1, sym, ElfW(Sym)) {
if (sym->st_shndx == SHN_COMMON) {
/* align symbol */
align = sym->st_value;
388,32 → 432,35
/* relocate symbol table, resolve undefined symbols if do_resolve is
true and output error if undefined symbol. */
static void relocate_syms(TCCState *s1, int do_resolve)
ST_FUNC void relocate_syms(TCCState *s1, int do_resolve)
{
Elf32_Sym *sym, *esym, *sym_end;
ElfW(Sym) *sym, *esym;
int sym_bind, sh_num, sym_index;
const char *name;
unsigned long addr;
sym_end = (Elf32_Sym *)(symtab_section->data + symtab_section->data_offset);
for(sym = (Elf32_Sym *)symtab_section->data + 1;
sym < sym_end;
sym++) {
for_each_elem(symtab_section, 1, sym, ElfW(Sym)) {
sh_num = sym->st_shndx;
if (sh_num == SHN_UNDEF) {
name = strtab_section->data + sym->st_name;
name = (char *) strtab_section->data + sym->st_name;
/* Use ld.so to resolve symbol for us (for tcc -run) */
if (do_resolve) {
name = symtab_section->link->data + sym->st_name;
addr = (unsigned long)resolve_sym(s1, name, ELF32_ST_TYPE(sym->st_info));
#if defined TCC_IS_NATIVE && !defined _WIN32
void *addr;
name = (char *) symtab_section->link->data + sym->st_name;
addr = resolve_sym(s1, name);
if (addr) {
sym->st_value = addr;
sym->st_value = (addr_t)addr;
#ifdef DEBUG_RELOC
printf ("relocate_sym: %s -> 0x%lx\n", name, sym->st_value);
#endif
goto found;
}
#endif
} else if (s1->dynsym) {
/* if dynamic symbol exist, then use it */
sym_index = find_elf_sym(s1->dynsym, name);
if (sym_index) {
esym = &((Elf32_Sym *)s1->dynsym->data)[sym_index];
esym = &((ElfW(Sym) *)s1->dynsym->data)[sym_index];
sym->st_value = esym->st_value;
goto found;
}
424,11 → 471,11
goto found;
/* only weak symbols are accepted to be undefined. Their
value is zero */
sym_bind = ELF32_ST_BIND(sym->st_info);
sym_bind = ELFW(ST_BIND)(sym->st_info);
if (sym_bind == STB_WEAK) {
sym->st_value = 0;
} else {
error_noabort("undefined symbol '%s'", name);
tcc_error_noabort("undefined symbol '%s'", name);
}
} else if (sh_num < SHN_LORESERVE) {
/* add section base */
438,31 → 485,31
}
}
/* relocate a given section (CPU dependent) */
static void relocate_section(TCCState *s1, Section *s)
/* relocate a given section (CPU dependent) by applying the relocations
in the associated relocation section */
ST_FUNC void relocate_section(TCCState *s1, Section *s)
{
Section *sr;
Elf32_Rel *rel, *rel_end, *qrel;
Elf32_Sym *sym;
Section *sr = s->reloc;
ElfW_Rel *rel;
ElfW(Sym) *sym;
int type, sym_index;
unsigned char *ptr;
unsigned long val, addr;
#if defined(TCC_TARGET_I386)
addr_t val, addr;
#if defined TCC_TARGET_I386 || defined TCC_TARGET_X86_64
ElfW_Rel *qrel = (ElfW_Rel *) sr->data; /* ptr to next reloc entry reused */
int esym_index;
#endif
sr = s->reloc;
rel_end = (Elf32_Rel *)(sr->data + sr->data_offset);
qrel = (Elf32_Rel *)sr->data;
for(rel = qrel;
rel < rel_end;
rel++) {
for_each_elem(sr, 0, rel, ElfW_Rel) {
ptr = s->data + rel->r_offset;
sym_index = ELF32_R_SYM(rel->r_info);
sym = &((Elf32_Sym *)symtab_section->data)[sym_index];
sym_index = ELFW(R_SYM)(rel->r_info);
sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
val = sym->st_value;
type = ELF32_R_TYPE(rel->r_info);
#if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
val += rel->r_addend;
#endif
type = ELFW(R_TYPE)(rel->r_info);
addr = s->sh_addr + rel->r_offset;
/* CPU specific */
473,15 → 520,15
esym_index = s1->symtab_to_dynsym[sym_index];
qrel->r_offset = rel->r_offset;
if (esym_index) {
qrel->r_info = ELF32_R_INFO(esym_index, R_386_32);
qrel->r_info = ELFW(R_INFO)(esym_index, R_386_32);
qrel++;
break;
} else {
qrel->r_info = ELF32_R_INFO(0, R_386_RELATIVE);
qrel->r_info = ELFW(R_INFO)(0, R_386_RELATIVE);
qrel++;
}
}
*(int *)ptr += val;
write32le(ptr, read32le(ptr) + val);
break;
case R_386_PC32:
if (s1->output_type == TCC_OUTPUT_DLL) {
489,64 → 536,332
esym_index = s1->symtab_to_dynsym[sym_index];
if (esym_index) {
qrel->r_offset = rel->r_offset;
qrel->r_info = ELF32_R_INFO(esym_index, R_386_PC32);
qrel->r_info = ELFW(R_INFO)(esym_index, R_386_PC32);
qrel++;
break;
}
}
*(int *)ptr += val - addr;
write32le(ptr, read32le(ptr) + val - addr);
break;
case R_386_PLT32:
*(int *)ptr += val - addr;
write32le(ptr, read32le(ptr) + val - addr);
break;
case R_386_GLOB_DAT:
case R_386_JMP_SLOT:
*(int *)ptr = val;
write32le(ptr, val);
break;
case R_386_GOTPC:
*(int *)ptr += s1->got->sh_addr - addr;
write32le(ptr, read32le(ptr) + s1->got->sh_addr - addr);
break;
case R_386_GOTOFF:
*(int *)ptr += val - s1->got->sh_addr;
write32le(ptr, read32le(ptr) + val - s1->got->sh_addr);
break;
case R_386_GOT32:
case R_386_GOT32X:
/* we load the got offset */
*(int *)ptr += s1->got_offsets[sym_index];
write32le(ptr, read32le(ptr) + s1->sym_attrs[sym_index].got_offset);
break;
case R_386_16:
if (s1->output_format != TCC_OUTPUT_FORMAT_BINARY) {
output_file:
tcc_error("can only produce 16-bit binary files");
}
write16le(ptr, read16le(ptr) + val);
break;
case R_386_PC16:
if (s1->output_format != TCC_OUTPUT_FORMAT_BINARY)
goto output_file;
write16le(ptr, read16le(ptr) + val - addr);
break;
case R_386_RELATIVE:
/* do nothing */
break;
case R_386_COPY:
/* This reloction must copy initialized data from the library
to the program .bss segment. Currently made like for ARM
(to remove noise of defaukt case). Is this true?
*/
break;
default:
fprintf(stderr,"FIXME: handle reloc type %d at %x [%p] to %x\n",
type, (unsigned)addr, ptr, (unsigned)val);
break;
#elif defined(TCC_TARGET_ARM)
case R_ARM_PC24:
case R_ARM_CALL:
case R_ARM_JUMP24:
case R_ARM_PLT32:
{
int x;
int x, is_thumb, is_call, h, blx_avail, is_bl, th_ko;
x = (*(int *)ptr)&0xffffff;
if (sym->st_shndx == SHN_UNDEF)
val = s1->plt->sh_addr;
#ifdef DEBUG_RELOC
printf ("reloc %d: x=0x%x val=0x%x ", type, x, val);
#endif
(*(int *)ptr) &= 0xff000000;
if (x & 0x800000)
x -= 0x1000000;
x *= 4;
x <<= 2;
blx_avail = (TCC_ARM_VERSION >= 5);
is_thumb = val & 1;
is_bl = (*(unsigned *) ptr) >> 24 == 0xeb;
is_call = (type == R_ARM_CALL || (type == R_ARM_PC24 && is_bl));
x += val - addr;
if((x & 3) != 0 || x >= 0x4000000 || x < -0x4000000)
error("can't relocate value at %x",addr);
#ifdef DEBUG_RELOC
printf (" newx=0x%x name=%s\n", x,
(char *) symtab_section->link->data + sym->st_name);
#endif
h = x & 2;
th_ko = (x & 3) && (!blx_avail || !is_call);
if (th_ko || x >= 0x2000000 || x < -0x2000000)
tcc_error("can't relocate value at %x,%d",addr, type);
x >>= 2;
x &= 0xffffff;
/* Only reached if blx is avail and it is a call */
if (is_thumb) {
x |= h << 24;
(*(int *)ptr) = 0xfa << 24; /* bl -> blx */
}
(*(int *)ptr) |= x;
}
break;
/* Since these relocations only concern Thumb-2 and blx instruction was
introduced before Thumb-2, we can assume blx is available and not
guard its use */
case R_ARM_THM_PC22:
case R_ARM_THM_JUMP24:
{
int x, hi, lo, s, j1, j2, i1, i2, imm10, imm11;
int to_thumb, is_call, to_plt, blx_bit = 1 << 12;
Section *plt;
/* weak reference */
if (sym->st_shndx == SHN_UNDEF &&
ELFW(ST_BIND)(sym->st_info) == STB_WEAK)
break;
/* Get initial offset */
hi = (*(uint16_t *)ptr);
lo = (*(uint16_t *)(ptr+2));
s = (hi >> 10) & 1;
j1 = (lo >> 13) & 1;
j2 = (lo >> 11) & 1;
i1 = (j1 ^ s) ^ 1;
i2 = (j2 ^ s) ^ 1;
imm10 = hi & 0x3ff;
imm11 = lo & 0x7ff;
x = (s << 24) | (i1 << 23) | (i2 << 22) |
(imm10 << 12) | (imm11 << 1);
if (x & 0x01000000)
x -= 0x02000000;
/* Relocation infos */
to_thumb = val & 1;
plt = s1->plt;
to_plt = (val >= plt->sh_addr) &&
(val < plt->sh_addr + plt->data_offset);
is_call = (type == R_ARM_THM_PC22);
/* Compute final offset */
if (to_plt && !is_call) /* Point to 1st instr of Thumb stub */
x -= 4;
x += val - addr;
if (!to_thumb && is_call) {
blx_bit = 0; /* bl -> blx */
x = (x + 3) & -4; /* Compute offset from aligned PC */
}
/* Check that relocation is possible
* offset must not be out of range
* if target is to be entered in arm mode:
- bit 1 must not set
- instruction must be a call (bl) or a jump to PLT */
if (!to_thumb || x >= 0x1000000 || x < -0x1000000)
if (to_thumb || (val & 2) || (!is_call && !to_plt))
tcc_error("can't relocate value at %x,%d",addr, type);
/* Compute and store final offset */
s = (x >> 24) & 1;
i1 = (x >> 23) & 1;
i2 = (x >> 22) & 1;
j1 = s ^ (i1 ^ 1);
j2 = s ^ (i2 ^ 1);
imm10 = (x >> 12) & 0x3ff;
imm11 = (x >> 1) & 0x7ff;
(*(uint16_t *)ptr) = (uint16_t) ((hi & 0xf800) |
(s << 10) | imm10);
(*(uint16_t *)(ptr+2)) = (uint16_t) ((lo & 0xc000) |
(j1 << 13) | blx_bit | (j2 << 11) |
imm11);
}
break;
case R_ARM_MOVT_ABS:
case R_ARM_MOVW_ABS_NC:
{
int x, imm4, imm12;
if (type == R_ARM_MOVT_ABS)
val >>= 16;
imm12 = val & 0xfff;
imm4 = (val >> 12) & 0xf;
x = (imm4 << 16) | imm12;
if (type == R_ARM_THM_MOVT_ABS)
*(int *)ptr |= x;
else
*(int *)ptr += x;
}
break;
case R_ARM_THM_MOVT_ABS:
case R_ARM_THM_MOVW_ABS_NC:
{
int x, i, imm4, imm3, imm8;
if (type == R_ARM_THM_MOVT_ABS)
val >>= 16;
imm8 = val & 0xff;
imm3 = (val >> 8) & 0x7;
i = (val >> 11) & 1;
imm4 = (val >> 12) & 0xf;
x = (imm3 << 28) | (imm8 << 16) | (i << 10) | imm4;
if (type == R_ARM_THM_MOVT_ABS)
*(int *)ptr |= x;
else
*(int *)ptr += x;
}
break;
case R_ARM_PREL31:
{
int x;
x = (*(int *)ptr) & 0x7fffffff;
(*(int *)ptr) &= 0x80000000;
x = (x * 2) / 2;
x += val - addr;
if((x^(x>>1))&0x40000000)
tcc_error("can't relocate value at %x,%d",addr, type);
(*(int *)ptr) |= x & 0x7fffffff;
}
case R_ARM_ABS32:
*(int *)ptr += val;
break;
case R_ARM_REL32:
*(int *)ptr += val - addr;
break;
case R_ARM_GOTPC:
*(int *)ptr += s1->got->sh_addr - addr;
break;
case R_ARM_GOTOFF:
*(int *)ptr += val - s1->got->sh_addr;
break;
case R_ARM_GOT32:
/* we load the got offset */
*(int *)ptr += s1->got_offsets[sym_index];
*(int *)ptr += s1->sym_attrs[sym_index].got_offset;
break;
case R_ARM_COPY:
break;
case R_ARM_V4BX:
/* trade Thumb support for ARMv4 support */
if ((0x0ffffff0 & *(int*)ptr) == 0x012FFF10)
*(int*)ptr ^= 0xE12FFF10 ^ 0xE1A0F000; /* BX Rm -> MOV PC, Rm */
break;
case R_ARM_GLOB_DAT:
case R_ARM_JUMP_SLOT:
*(addr_t *)ptr = val;
break;
case R_ARM_NONE:
/* Nothing to do. Normally used to indicate a dependency
on a certain symbol (like for exception handling under EABI). */
break;
default:
fprintf(stderr,"FIXME: handle reloc type %x at %lx [%.8x] to %lx\n",
type,addr,(unsigned int )ptr,val);
fprintf(stderr,"FIXME: handle reloc type %x at %x [%p] to %x\n",
type, (unsigned)addr, ptr, (unsigned)val);
break;
#elif defined(TCC_TARGET_ARM64)
case R_AARCH64_ABS64:
write64le(ptr, val);
break;
case R_AARCH64_ABS32:
write32le(ptr, val);
break;
case R_AARCH64_MOVW_UABS_G0_NC:
write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
(val & 0xffff) << 5));
break;
case R_AARCH64_MOVW_UABS_G1_NC:
write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
(val >> 16 & 0xffff) << 5));
break;
case R_AARCH64_MOVW_UABS_G2_NC:
write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
(val >> 32 & 0xffff) << 5));
break;
case R_AARCH64_MOVW_UABS_G3:
write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
(val >> 48 & 0xffff) << 5));
break;
case R_AARCH64_ADR_PREL_PG_HI21: {
uint64_t off = (val >> 12) - (addr >> 12);
if ((off + ((uint64_t)1 << 20)) >> 21)
tcc_error("R_AARCH64_ADR_PREL_PG_HI21 relocation failed");
write32le(ptr, ((read32le(ptr) & 0x9f00001f) |
(off & 0x1ffffc) << 3 | (off & 3) << 29));
break;
}
case R_AARCH64_ADD_ABS_LO12_NC:
write32le(ptr, ((read32le(ptr) & 0xffc003ff) |
(val & 0xfff) << 10));
break;
case R_AARCH64_JUMP26:
case R_AARCH64_CALL26:
/* This check must match the one in build_got_entries, testing
if we really need a PLT slot. */
if (sym->st_shndx == SHN_UNDEF)
/* We've put the PLT slot offset into r_addend when generating
it, and that's what we must use as relocation value (adjusted
by section offset of course). */
val = s1->plt->sh_addr + rel->r_addend;
#ifdef DEBUG_RELOC
printf ("reloc %d @ 0x%lx: val=0x%lx name=%s\n", type, addr, val,
(char *) symtab_section->link->data + sym->st_name);
#endif
if (((val - addr) + ((uint64_t)1 << 27)) & ~(uint64_t)0xffffffc)
{
tcc_error("R_AARCH64_(JUMP|CALL)26 relocation failed (val=%lx, addr=%lx)", addr, val);
}
write32le(ptr, (0x14000000 |
(uint32_t)(type == R_AARCH64_CALL26) << 31 |
((val - addr) >> 2 & 0x3ffffff)));
break;
case R_AARCH64_ADR_GOT_PAGE: {
uint64_t off =
(((s1->got->sh_addr +
s1->sym_attrs[sym_index].got_offset) >> 12) - (addr >> 12));
if ((off + ((uint64_t)1 << 20)) >> 21)
tcc_error("R_AARCH64_ADR_GOT_PAGE relocation failed");
write32le(ptr, ((read32le(ptr) & 0x9f00001f) |
(off & 0x1ffffc) << 3 | (off & 3) << 29));
break;
}
case R_AARCH64_LD64_GOT_LO12_NC:
write32le(ptr,
((read32le(ptr) & 0xfff803ff) |
((s1->got->sh_addr +
s1->sym_attrs[sym_index].got_offset) & 0xff8) << 7));
break;
case R_AARCH64_COPY:
break;
case R_AARCH64_GLOB_DAT:
case R_AARCH64_JUMP_SLOT:
/* They don't need addend */
#ifdef DEBUG_RELOC
printf ("reloc %d @ 0x%lx: val=0x%lx name=%s\n", type, addr,
val - rel->r_addend,
(char *) symtab_section->link->data + sym->st_name);
#endif
write64le(ptr, val - rel->r_addend);
break;
default:
fprintf(stderr, "FIXME: handle reloc type %x at %x [%p] to %x\n",
type, (unsigned)addr, ptr, (unsigned)val);
break;
#elif defined(TCC_TARGET_C67)
case R_C60_32:
*(int *)ptr += val;
555,13 → 870,13
{
uint32_t orig;
/* put the low 16 bits of the absolute address */
// add to what is already there
/* put the low 16 bits of the absolute address
add to what is already there */
orig = ((*(int *)(ptr )) >> 7) & 0xffff;
orig |= (((*(int *)(ptr+4)) >> 7) & 0xffff) << 16;
//patch both at once - assumes always in pairs Low - High
/* patch both at once - assumes always in pairs Low - High */
*(int *) ptr = (*(int *) ptr & (~(0xffff << 7)) ) | (((val+orig) & 0xffff) << 7);
*(int *)(ptr+4) = (*(int *)(ptr+4) & (~(0xffff << 7)) ) | ((((val+orig)>>16) & 0xffff) << 7);
570,9 → 885,91
case R_C60HI16:
break;
default:
fprintf(stderr,"FIXME: handle reloc type %x at %lx [%.8x] to %lx\n",
type,addr,(unsigned int )ptr,val);
fprintf(stderr,"FIXME: handle reloc type %x at %x [%p] to %x\n",
type, (unsigned)addr, ptr, (unsigned)val);
break;
#elif defined(TCC_TARGET_X86_64)
case R_X86_64_64:
if (s1->output_type == TCC_OUTPUT_DLL) {
esym_index = s1->symtab_to_dynsym[sym_index];
qrel->r_offset = rel->r_offset;
if (esym_index) {
qrel->r_info = ELFW(R_INFO)(esym_index, R_X86_64_64);
qrel->r_addend = rel->r_addend;
qrel++;
break;
} else {
qrel->r_info = ELFW(R_INFO)(0, R_X86_64_RELATIVE);
qrel->r_addend = read64le(ptr) + val;
qrel++;
}
}
write64le(ptr, read64le(ptr) + val);
break;
case R_X86_64_32:
case R_X86_64_32S:
if (s1->output_type == TCC_OUTPUT_DLL) {
/* XXX: this logic may depend on TCC's codegen
now TCC uses R_X86_64_32 even for a 64bit pointer */
qrel->r_info = ELFW(R_INFO)(0, R_X86_64_RELATIVE);
/* Use sign extension! */
qrel->r_addend = (int)read32le(ptr) + val;
qrel++;
}
write32le(ptr, read32le(ptr) + val);
break;
case R_X86_64_PC32:
if (s1->output_type == TCC_OUTPUT_DLL) {
/* DLL relocation */
esym_index = s1->symtab_to_dynsym[sym_index];
if (esym_index) {
qrel->r_offset = rel->r_offset;
qrel->r_info = ELFW(R_INFO)(esym_index, R_X86_64_PC32);
/* Use sign extension! */
qrel->r_addend = (int)read32le(ptr);
qrel++;
break;
}
}
goto plt32pc32;
case R_X86_64_PLT32:
/* We've put the PLT slot offset into r_addend when generating
it, and that's what we must use as relocation value (adjusted
by section offset of course). */
val = s1->plt->sh_addr + rel->r_addend;
/* fallthrough. */
plt32pc32:
{
long long diff;
diff = (long long)val - addr;
if (diff < -2147483648LL || diff > 2147483647LL) {
tcc_error("internal error: relocation failed");
}
write32le(ptr, read32le(ptr) + diff);
}
break;
case R_X86_64_GLOB_DAT:
case R_X86_64_JUMP_SLOT:
/* They don't need addend */
write64le(ptr, val - rel->r_addend);
break;
case R_X86_64_GOTPCREL:
case R_X86_64_GOTPCRELX:
case R_X86_64_REX_GOTPCRELX:
write32le(ptr, read32le(ptr) +
(s1->got->sh_addr - addr +
s1->sym_attrs[sym_index].got_offset - 4));
break;
case R_X86_64_GOTTPOFF:
write32le(ptr, read32le(ptr) + val - s1->got->sh_addr);
break;
case R_X86_64_GOT32:
/* we load the got offset */
write32le(ptr, read32le(ptr) + s1->sym_attrs[sym_index].got_offset);
break;
#else
#error unsupported processor
#endif
587,34 → 984,39
static void relocate_rel(TCCState *s1, Section *sr)
{
Section *s;
Elf32_Rel *rel, *rel_end;
ElfW_Rel *rel;
s = s1->sections[sr->sh_info];
rel_end = (Elf32_Rel *)(sr->data + sr->data_offset);
for(rel = (Elf32_Rel *)sr->data;
rel < rel_end;
rel++) {
for_each_elem(sr, 0, rel, ElfW_Rel)
rel->r_offset += s->sh_addr;
}
}
/* count the number of dynamic relocations so that we can reserve
their space */
static int prepare_dynamic_rel(TCCState *s1, Section *sr)
{
Elf32_Rel *rel, *rel_end;
ElfW_Rel *rel;
int sym_index, esym_index, type, count;
count = 0;
rel_end = (Elf32_Rel *)(sr->data + sr->data_offset);
for(rel = (Elf32_Rel *)sr->data; rel < rel_end; rel++) {
sym_index = ELF32_R_SYM(rel->r_info);
type = ELF32_R_TYPE(rel->r_info);
for_each_elem(sr, 0, rel, ElfW_Rel) {
sym_index = ELFW(R_SYM)(rel->r_info);
type = ELFW(R_TYPE)(rel->r_info);
switch(type) {
#if defined(TCC_TARGET_I386)
case R_386_32:
#elif defined(TCC_TARGET_X86_64)
case R_X86_64_32:
case R_X86_64_32S:
case R_X86_64_64:
#endif
count++;
break;
#if defined(TCC_TARGET_I386)
case R_386_PC32:
#elif defined(TCC_TARGET_X86_64)
case R_X86_64_PC32:
#endif
esym_index = s1->symtab_to_dynsym[sym_index];
if (esym_index)
count++;
626,48 → 1028,30
if (count) {
/* allocate the section */
sr->sh_flags |= SHF_ALLOC;
sr->sh_size = count * sizeof(Elf32_Rel);
sr->sh_size = count * sizeof(ElfW_Rel);
}
return count;
}
static void put_got_offset(TCCState *s1, int index, unsigned long val)
static struct sym_attr *alloc_sym_attr(TCCState *s1, int index)
{
int n;
unsigned long *tab;
struct sym_attr *tab;
if (index >= s1->nb_got_offsets) {
if (index >= s1->nb_sym_attrs) {
/* find immediately bigger power of 2 and reallocate array */
n = 1;
while (index >= n)
n *= 2;
tab = tcc_realloc(s1->got_offsets, n * sizeof(unsigned long));
if (!tab)
error("memory full");
s1->got_offsets = tab;
memset(s1->got_offsets + s1->nb_got_offsets, 0,
(n - s1->nb_got_offsets) * sizeof(unsigned long));
s1->nb_got_offsets = n;
tab = tcc_realloc(s1->sym_attrs, n * sizeof(*s1->sym_attrs));
s1->sym_attrs = tab;
memset(s1->sym_attrs + s1->nb_sym_attrs, 0,
(n - s1->nb_sym_attrs) * sizeof(*s1->sym_attrs));
s1->nb_sym_attrs = n;
}
s1->got_offsets[index] = val;
return &s1->sym_attrs[index];
}
/* XXX: suppress that */
static void put32(unsigned char *p, uint32_t val)
{
p[0] = val;
p[1] = val >> 8;
p[2] = val >> 16;
p[3] = val >> 24;
}
#if defined(TCC_TARGET_I386) || defined(TCC_TARGET_ARM)
static uint32_t get32(unsigned char *p)
{
return p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
}
#endif
static void build_got(TCCState *s1)
{
unsigned char *ptr;
675,53 → 1059,97
/* if no got, then create it */
s1->got = new_section(s1, ".got", SHT_PROGBITS, SHF_ALLOC | SHF_WRITE);
s1->got->sh_entsize = 4;
add_elf_sym(symtab_section, 0, 4, ELF32_ST_INFO(STB_GLOBAL, STT_OBJECT),
add_elf_sym(symtab_section, 0, 4, ELFW(ST_INFO)(STB_GLOBAL, STT_OBJECT),
0, s1->got->sh_num, "_GLOBAL_OFFSET_TABLE_");
ptr = section_ptr_add(s1->got, 3 * sizeof(int));
ptr = section_ptr_add(s1->got, 3 * PTR_SIZE);
#if PTR_SIZE == 4
/* keep space for _DYNAMIC pointer, if present */
put32(ptr, 0);
write32le(ptr, 0);
/* two dummy got entries */
put32(ptr + 4, 0);
put32(ptr + 8, 0);
write32le(ptr + 4, 0);
write32le(ptr + 8, 0);
#else
/* keep space for _DYNAMIC pointer, if present */
write32le(ptr, 0);
write32le(ptr + 4, 0);
/* two dummy got entries */
write32le(ptr + 8, 0);
write32le(ptr + 12, 0);
write32le(ptr + 16, 0);
write32le(ptr + 20, 0);
#endif
}
/* put a got entry corresponding to a symbol in symtab_section. 'size'
and 'info' can be modifed if more precise info comes from the DLL */
static void put_got_entry(TCCState *s1,
/* put a got or plt entry corresponding to a symbol in symtab_section. 'size'
and 'info' can be modifed if more precise info comes from the DLL.
Returns offset of GOT or PLT slot. */
static unsigned long put_got_entry(TCCState *s1,
int reloc_type, unsigned long size, int info,
int sym_index)
{
int index;
int index, need_plt_entry;
const char *name;
Elf32_Sym *sym;
ElfW(Sym) *sym;
unsigned long offset;
int *ptr;
struct sym_attr *symattr;
if (!s1->got)
build_got(s1);
/* if a got entry already exists for that symbol, no need to add one */
if (sym_index < s1->nb_got_offsets &&
s1->got_offsets[sym_index] != 0)
return;
need_plt_entry =
#ifdef TCC_TARGET_X86_64
(reloc_type == R_X86_64_JUMP_SLOT);
#elif defined(TCC_TARGET_I386)
(reloc_type == R_386_JMP_SLOT);
#elif defined(TCC_TARGET_ARM)
(reloc_type == R_ARM_JUMP_SLOT);
#elif defined(TCC_TARGET_ARM64)
(reloc_type == R_AARCH64_JUMP_SLOT);
#else
0;
#endif
put_got_offset(s1, sym_index, s1->got->data_offset);
if (need_plt_entry && !s1->plt) {
/* add PLT */
s1->plt = new_section(s1, ".plt", SHT_PROGBITS,
SHF_ALLOC | SHF_EXECINSTR);
s1->plt->sh_entsize = 4;
}
if (s1->dynsym) {
sym = &((Elf32_Sym *)symtab_section->data)[sym_index];
name = symtab_section->link->data + sym->st_name;
/* If a got/plt entry already exists for that symbol, no need to add one */
if (sym_index < s1->nb_sym_attrs) {
if (need_plt_entry && s1->sym_attrs[sym_index].plt_offset)
return s1->sym_attrs[sym_index].plt_offset;
else if (!need_plt_entry && s1->sym_attrs[sym_index].got_offset)
return s1->sym_attrs[sym_index].got_offset;
}
symattr = alloc_sym_attr(s1, sym_index);
/* Only store the GOT offset if it's not generated for the PLT entry. */
if (!need_plt_entry)
symattr->got_offset = s1->got->data_offset;
sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
name = (char *) symtab_section->link->data + sym->st_name;
offset = sym->st_value;
#ifdef TCC_TARGET_I386
if (reloc_type == R_386_JMP_SLOT) {
#if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
if (need_plt_entry) {
Section *plt;
uint8_t *p;
int modrm;
unsigned long relofs;
#if defined(TCC_OUTPUT_DLL_WITH_PLT)
modrm = 0x25;
#else
/* if we build a DLL, we add a %ebx offset */
if (s1->output_type == TCC_OUTPUT_DLL)
modrm = 0xa3;
else
modrm = 0x25;
#endif
/* add a PLT entry */
plt = s1->plt;
728,36 → 1156,47
if (plt->data_offset == 0) {
/* first plt entry */
p = section_ptr_add(plt, 16);
p[0] = 0xff; /* pushl got + 4 */
p[0] = 0xff; /* pushl got + PTR_SIZE */
p[1] = modrm + 0x10;
put32(p + 2, 4);
p[6] = 0xff; /* jmp *(got + 8) */
write32le(p + 2, PTR_SIZE);
p[6] = 0xff; /* jmp *(got + PTR_SIZE * 2) */
p[7] = modrm;
put32(p + 8, 8);
write32le(p + 8, PTR_SIZE * 2);
}
/* The PLT slot refers to the relocation entry it needs
via offset. The reloc entry is created below, so its
offset is the current data_offset. */
relofs = s1->got->reloc ? s1->got->reloc->data_offset : 0;
symattr->plt_offset = plt->data_offset;
p = section_ptr_add(plt, 16);
p[0] = 0xff; /* jmp *(got + x) */
p[1] = modrm;
put32(p + 2, s1->got->data_offset);
write32le(p + 2, s1->got->data_offset);
p[6] = 0x68; /* push $xxx */
put32(p + 7, (plt->data_offset - 32) >> 1);
#ifdef TCC_TARGET_X86_64
/* On x86-64, the relocation is referred to by _index_. */
write32le(p + 7, relofs / sizeof (ElfW_Rel));
#else
write32le(p + 7, relofs);
#endif
p[11] = 0xe9; /* jmp plt_start */
put32(p + 12, -(plt->data_offset));
write32le(p + 12, -(plt->data_offset));
/* the symbol is modified so that it will be relocated to
the PLT */
if (s1->output_type == TCC_OUTPUT_EXE)
/* If this was an UNDEF symbol set the offset in the
dynsymtab to the PLT slot, so that PC32 relocs to it
can be resolved. */
if (sym->st_shndx == SHN_UNDEF)
offset = plt->data_offset - 16;
}
#elif defined(TCC_TARGET_ARM)
if (reloc_type == R_ARM_JUMP_SLOT) {
if (need_plt_entry) {
Section *plt;
uint8_t *p;
/* if we build a DLL, we add a %ebx offset */
if (s1->output_type == TCC_OUTPUT_DLL)
error("DLLs unimplemented!");
tcc_error("DLLs unimplemented!");
/* add a PLT entry */
plt = s1->plt;
764,73 → 1203,114
if (plt->data_offset == 0) {
/* first plt entry */
p = section_ptr_add(plt, 16);
put32(p , 0xe52de004);
put32(p + 4, 0xe59fe010);
put32(p + 8, 0xe08fe00e);
put32(p + 12, 0xe5bef008);
write32le(p, 0xe52de004); /* push {lr} */
write32le(p+4, 0xe59fe010); /* ldr lr, [pc, #16] */
write32le(p+8, 0xe08fe00e); /* add lr, pc, lr */
write32le(p+12, 0xe5bef008); /* ldr pc, [lr, #8]! */
}
symattr->plt_offset = plt->data_offset;
if (symattr->plt_thumb_stub) {
p = section_ptr_add(plt, 20);
write32le(p, 0x4778); /* bx pc */
write32le(p+2, 0x46c0); /* nop */
p += 4;
} else
p = section_ptr_add(plt, 16);
put32(p , 0xe59fc004);
put32(p+4, 0xe08fc00c);
put32(p+8, 0xe59cf000);
put32(p+12, s1->got->data_offset);
write32le(p, 0xe59fc004); /* ldr ip, [pc, #4] ; GOT entry offset */
write32le(p+4, 0xe08fc00c); /* add ip, pc, ip ; addr of GOT entry */
write32le(p+8, 0xe59cf000); /* ldr pc, [ip] ; jump to GOT entry */
write32le(p+12, s1->got->data_offset); /* GOT entry off once patched */
/* the symbol is modified so that it will be relocated to
the PLT */
if (s1->output_type == TCC_OUTPUT_EXE)
if (sym->st_shndx == SHN_UNDEF)
offset = plt->data_offset - 16;
}
#elif defined(TCC_TARGET_ARM64)
if (need_plt_entry) {
Section *plt;
uint8_t *p;
if (s1->output_type == TCC_OUTPUT_DLL)
tcc_error("DLLs unimplemented!");
plt = s1->plt;
if (plt->data_offset == 0)
section_ptr_add(plt, 32);
symattr->plt_offset = plt->data_offset;
p = section_ptr_add(plt, 16);
write32le(p, s1->got->data_offset);
write32le(p + 4, (uint64_t)s1->got->data_offset >> 32);
if (sym->st_shndx == SHN_UNDEF)
offset = plt->data_offset - 16;
}
#elif defined(TCC_TARGET_C67)
error("C67 got not implemented");
if (s1->dynsym) {
tcc_error("C67 got not implemented");
}
#else
#error unsupported CPU
#endif
if (s1->dynsym) {
/* XXX This might generate multiple syms for name. */
index = put_elf_sym(s1->dynsym, offset,
size, info, 0, sym->st_shndx, name);
/* put a got entry */
/* Create the relocation (it's against the GOT for PLT
and GOT relocs). */
put_elf_reloc(s1->dynsym, s1->got,
s1->got->data_offset,
reloc_type, index);
} else {
/* Without .dynsym (i.e. static link or memory output) we
still need relocs against the generated got, so as to fill
the entries with the symbol values (determined later). */
put_elf_reloc(symtab_section, s1->got,
s1->got->data_offset,
reloc_type, sym_index);
}
ptr = section_ptr_add(s1->got, sizeof(int));
/* And now create the GOT slot itself. */
ptr = section_ptr_add(s1->got, PTR_SIZE);
*ptr = 0;
if (need_plt_entry)
return symattr->plt_offset;
else
return symattr->got_offset;
}
/* build GOT and PLT entries */
static void build_got_entries(TCCState *s1)
ST_FUNC void build_got_entries(TCCState *s1)
{
Section *s, *symtab;
Elf32_Rel *rel, *rel_end;
Elf32_Sym *sym;
Section *s;
ElfW_Rel *rel;
ElfW(Sym) *sym;
int i, type, reloc_type, sym_index;
for(i = 1; i < s1->nb_sections; i++) {
s = s1->sections[i];
if (s->sh_type != SHT_REL)
if (s->sh_type != SHT_RELX)
continue;
/* no need to handle got relocations */
if (s->link != symtab_section)
continue;
symtab = s->link;
rel_end = (Elf32_Rel *)(s->data + s->data_offset);
for(rel = (Elf32_Rel *)s->data;
rel < rel_end;
rel++) {
type = ELF32_R_TYPE(rel->r_info);
for_each_elem(s, 0, rel, ElfW_Rel) {
type = ELFW(R_TYPE)(rel->r_info);
switch(type) {
#if defined(TCC_TARGET_I386)
case R_386_GOT32:
case R_386_GOT32X:
case R_386_GOTOFF:
case R_386_GOTPC:
case R_386_PLT32:
if (!s1->got)
build_got(s1);
if (type == R_386_GOT32 || type == R_386_PLT32) {
sym_index = ELF32_R_SYM(rel->r_info);
sym = &((Elf32_Sym *)symtab_section->data)[sym_index];
if (type == R_386_GOT32 || type == R_386_GOT32X ||
type == R_386_PLT32) {
sym_index = ELFW(R_SYM)(rel->r_info);
sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
/* look at the symbol got offset. If none, then add one */
if (type == R_386_GOT32)
if (type == R_386_GOT32 || type == R_386_GOT32X)
reloc_type = R_386_GLOB_DAT;
else
reloc_type = R_386_JMP_SLOT;
839,6 → 1319,9
}
break;
#elif defined(TCC_TARGET_ARM)
case R_ARM_PC24:
case R_ARM_CALL:
case R_ARM_JUMP24:
case R_ARM_GOT32:
case R_ARM_GOTOFF:
case R_ARM_GOTPC:
845,16 → 1328,95
case R_ARM_PLT32:
if (!s1->got)
build_got(s1);
if (type == R_ARM_GOT32 || type == R_ARM_PLT32) {
sym_index = ELF32_R_SYM(rel->r_info);
sym = &((Elf32_Sym *)symtab_section->data)[sym_index];
sym_index = ELFW(R_SYM)(rel->r_info);
sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
if (type != R_ARM_GOTOFF && type != R_ARM_GOTPC
&& sym->st_shndx == SHN_UNDEF) {
unsigned long ofs;
/* look at the symbol got offset. If none, then add one */
if (type == R_ARM_GOT32)
reloc_type = R_ARM_GLOB_DAT;
else
reloc_type = R_ARM_JUMP_SLOT;
ofs = put_got_entry(s1, reloc_type, sym->st_size,
sym->st_info, sym_index);
#ifdef DEBUG_RELOC
printf ("maybegot: %s, %d, %d --> ofs=0x%x\n",
(char *) symtab_section->link->data + sym->st_name,
type, sym->st_shndx, ofs);
#endif
if (type != R_ARM_GOT32) {
addr_t *ptr = (addr_t*)(s1->sections[s->sh_info]->data
+ rel->r_offset);
/* x must be signed! */
int x = *ptr & 0xffffff;
x = (x << 8) >> 8;
x <<= 2;
x += ofs;
x >>= 2;
#ifdef DEBUG_RELOC
printf ("insn=0x%x --> 0x%x (x==0x%x)\n", *ptr,
(*ptr & 0xff000000) | x, x);
#endif
*ptr = (*ptr & 0xff000000) | x;
}
}
break;
case R_ARM_THM_JUMP24:
sym_index = ELFW(R_SYM)(rel->r_info);
sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
/* We are relocating a jump from thumb code to arm code */
if (sym->st_shndx != SHN_UNDEF && !(sym->st_value & 1)) {
int index;
uint8_t *p;
char *name, buf[1024];
Section *text_section;
name = (char *) symtab_section->link->data + sym->st_name;
text_section = s1->sections[sym->st_shndx];
/* Modify reloc to target a thumb stub to switch to ARM */
snprintf(buf, sizeof(buf), "%s_from_thumb", name);
index = put_elf_sym(symtab_section,
text_section->data_offset + 1,
sym->st_size, sym->st_info, 0,
sym->st_shndx, buf);
rel->r_info = ELFW(R_INFO)(index, type);
/* Create a thumb stub fonction to switch to ARM mode */
put_elf_reloc(symtab_section, text_section,
text_section->data_offset + 4, R_ARM_JUMP24,
sym_index);
p = section_ptr_add(text_section, 8);
write32le(p, 0x4778); /* bx pc */
write32le(p+2, 0x46c0); /* nop */
write32le(p+4, 0xeafffffe); /* b $sym */
}
#elif defined(TCC_TARGET_ARM64)
//xx Other cases may be required here:
case R_AARCH64_ADR_GOT_PAGE:
case R_AARCH64_LD64_GOT_LO12_NC:
if (!s1->got)
build_got(s1);
sym_index = ELFW(R_SYM)(rel->r_info);
sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
reloc_type = R_AARCH64_GLOB_DAT;
put_got_entry(s1, reloc_type, sym->st_size, sym->st_info,
sym_index);
break;
case R_AARCH64_JUMP26:
case R_AARCH64_CALL26:
if (!s1->got)
build_got(s1);
sym_index = ELFW(R_SYM)(rel->r_info);
sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
if (sym->st_shndx == SHN_UNDEF) {
unsigned long ofs;
reloc_type = R_AARCH64_JUMP_SLOT;
ofs = put_got_entry(s1, reloc_type, sym->st_size,
sym->st_info, sym_index);
/* We store the place of the generated PLT slot
in our addend. */
rel->r_addend += ofs;
}
break;
#elif defined(TCC_TARGET_C67)
865,8 → 1427,8
if (!s1->got)
build_got(s1);
if (type == R_C60_GOT32 || type == R_C60_PLT32) {
sym_index = ELF32_R_SYM(rel->r_info);
sym = &((Elf32_Sym *)symtab_section->data)[sym_index];
sym_index = ELFW(R_SYM)(rel->r_info);
sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
/* look at the symbol got offset. If none, then add one */
if (type == R_C60_GOT32)
reloc_type = R_C60_GLOB_DAT;
876,6 → 1438,44
sym_index);
}
break;
#elif defined(TCC_TARGET_X86_64)
case R_X86_64_GOT32:
case R_X86_64_GOTTPOFF:
case R_X86_64_GOTPCREL:
case R_X86_64_GOTPCRELX:
case R_X86_64_REX_GOTPCRELX:
case R_X86_64_PLT32:
sym_index = ELFW(R_SYM)(rel->r_info);
sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
if (type == R_X86_64_PLT32 &&
ELFW(ST_VISIBILITY)(sym->st_other) != STV_DEFAULT)
{
rel->r_info = ELFW(R_INFO)(sym_index, R_X86_64_PC32);
break;
}
if (!s1->got) {
build_got(s1);
sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
}
if (type == R_X86_64_GOT32 || type == R_X86_64_GOTPCREL ||
type == R_X86_64_GOTPCRELX ||
type == R_X86_64_REX_GOTPCRELX ||
type == R_X86_64_PLT32) {
unsigned long ofs;
/* look at the symbol got offset. If none, then add one */
if (type == R_X86_64_PLT32)
reloc_type = R_X86_64_JUMP_SLOT;
else
reloc_type = R_X86_64_GLOB_DAT;
ofs = put_got_entry(s1, reloc_type, sym->st_size,
sym->st_info, sym_index);
if (type == R_X86_64_PLT32)
/* We store the place of the generated PLT slot
in our addend. */
rel->r_addend += ofs;
}
break;
#else
#error unsupported CPU
#endif
886,7 → 1486,7
}
}
static Section *new_symtab(TCCState *s1,
ST_FUNC Section *new_symtab(TCCState *s1,
const char *symtab_name, int sh_type, int sh_flags,
const char *strtab_name,
const char *hash_name, int hash_sh_flags)
895,7 → 1495,7
int *ptr, nb_buckets;
symtab = new_section(s1, symtab_name, sh_type, sh_flags);
symtab->sh_entsize = sizeof(Elf32_Sym);
symtab->sh_entsize = sizeof(ElfW(Sym));
strtab = new_section(s1, strtab_name, SHT_STRTAB, sh_flags);
put_elf_str(strtab, "");
symtab->link = strtab;
916,10 → 1516,10
}
/* put dynamic tag */
static void put_dt(Section *dynamic, int dt, unsigned long val)
static void put_dt(Section *dynamic, int dt, addr_t val)
{
Elf32_Dyn *dyn;
dyn = section_ptr_add(dynamic, sizeof(Elf32_Dyn));
ElfW(Dyn) *dyn;
dyn = section_ptr_add(dynamic, sizeof(ElfW(Dyn)));
dyn->d_tag = dt;
dyn->d_un.d_val = val;
}
944,59 → 1544,108
add_elf_sym(symtab_section,
0, 0,
ELF32_ST_INFO(STB_GLOBAL, STT_NOTYPE), 0,
ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
s->sh_num, sym_start);
add_elf_sym(symtab_section,
end_offset, 0,
ELF32_ST_INFO(STB_GLOBAL, STT_NOTYPE), 0,
ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
s->sh_num, sym_end);
}
/* add tcc runtime libraries */
static void tcc_add_runtime(TCCState *s1)
static int tcc_add_support(TCCState *s1, const char *filename)
{
char buf[1024];
snprintf(buf, sizeof(buf), "%s/%s/%s", s1->tcc_lib_path,
/* an cpu specific path inside tcc_lib_path, mainly for keeping libtcc1.a */
#ifdef TCC_TARGET_I386
"i386"
#endif
#ifdef TCC_TARGET_X86_64
"x86-64"
#endif
#ifdef TCC_TARGET_ARM
"arm"
#endif
#ifdef TCC_TARGET_ARM64
"arm64"
#endif
#ifdef TCC_TARGET_C67
"C67"
#endif
,filename);
return tcc_add_file(s1, buf, TCC_FILETYPE_BINARY);
}
ST_FUNC void tcc_add_bcheck(TCCState *s1)
{
#ifdef CONFIG_TCC_BCHECK
if (do_bounds_check) {
unsigned long *ptr;
Section *init_section;
unsigned char *pinit;
int sym_index;
addr_t *ptr;
if (0 == s1->do_bounds_check)
return;
/* XXX: add an object file to do that */
ptr = section_ptr_add(bounds_section, sizeof(unsigned long));
ptr = section_ptr_add(bounds_section, sizeof(*ptr));
*ptr = 0;
add_elf_sym(symtab_section, 0, 0,
ELF32_ST_INFO(STB_GLOBAL, STT_NOTYPE), 0,
ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
bounds_section->sh_num, "__bounds_start");
/* add bound check code */
snprintf(buf, sizeof(buf), "%s/%s", tcc_lib_path, "bcheck.o");
tcc_add_file(s1, buf);
#ifdef TCC_TARGET_I386
if (s1->output_type != TCC_OUTPUT_MEMORY) {
/* add 'call __bound_init()' in .init section */
init_section = find_section(s1, ".init");
pinit = section_ptr_add(init_section, 5);
/* XXX not called on MSYS, reason is unknown. For this
case a call to __bound_init is performed in bcheck.c
when __bound_ptr_add, __bound_new_region,
__bound_delete_region called */
int sym_index = find_elf_sym(symtab_section, "__bound_init");
if (sym_index) {
Section *init_section = find_section(s1, ".init");
unsigned char *pinit = section_ptr_add(init_section, 5);
pinit[0] = 0xe8;
put32(pinit + 1, -4);
sym_index = find_elf_sym(symtab_section, "__bound_init");
write32le(pinit + 1, -4);
put_elf_reloc(symtab_section, init_section,
init_section->data_offset - 4, R_386_PC32, sym_index);
}
else
tcc_warning("__bound_init not defined");
}
#endif
}
#endif
/* add tcc runtime libraries */
ST_FUNC void tcc_add_runtime(TCCState *s1)
{
tcc_add_pragma_libs(s1);
/* add libc */
if (!s1->nostdlib) {
tcc_add_library(s1, "c");
#ifdef CONFIG_USE_LIBGCC
if (!s1->static_link) {
tcc_add_file(s1, TCC_LIBGCC, TCC_FILETYPE_BINARY);
}
#endif
#if !defined(TCC_TARGET_MEOS)
tcc_add_support(s1, "libtcc1.a");
#endif
}
snprintf(buf, sizeof(buf), "%s/%s", tcc_lib_path, "libtcc1.a");
tcc_add_file(s1, buf);
}
/* tcc_add_bcheck tries to relocate a call to __bound_init in _init so
libtcc1.a must be loaded before for __bound_init to be defined and
crtn.o must be loaded after to not finalize _init too early. */
tcc_add_bcheck(s1);
if (!s1->nostdlib) {
/* add crt end if not memory output */
if (s1->output_type != TCC_OUTPUT_MEMORY && !s1->nostdlib) {
tcc_add_file(s1, CONFIG_TCC_CRT_PREFIX "/crtn.o");
if (s1->output_type != TCC_OUTPUT_MEMORY)
#if defined(TCC_TARGET_MEOS)
;
// tcc_add_crt(s1, "start.o");
#else
tcc_add_crt(s1, "crtn.o");
#endif
}
}
1003,7 → 1652,7
/* add various standard linker symbols (must be done after the
sections are filled (for example after allocating common
symbols)) */
static void tcc_add_linker_symbols(TCCState *s1)
ST_FUNC void tcc_add_linker_symbols(TCCState *s1)
{
char buf[1024];
int i;
1011,15 → 1660,15
add_elf_sym(symtab_section,
text_section->data_offset, 0,
ELF32_ST_INFO(STB_GLOBAL, STT_NOTYPE), 0,
ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
text_section->sh_num, "_etext");
add_elf_sym(symtab_section,
data_section->data_offset, 0,
ELF32_ST_INFO(STB_GLOBAL, STT_NOTYPE), 0,
ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
data_section->sh_num, "_edata");
add_elf_sym(symtab_section,
bss_section->data_offset, 0,
ELF32_ST_INFO(STB_GLOBAL, STT_NOTYPE), 0,
ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
bss_section->sh_num, "_end");
/* horrible new standard ldscript defines */
add_init_array_defines(s1, ".preinit_array");
1048,12 → 1697,12
snprintf(buf, sizeof(buf), "__start_%s", s->name);
add_elf_sym(symtab_section,
0, 0,
ELF32_ST_INFO(STB_GLOBAL, STT_NOTYPE), 0,
ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
s->sh_num, buf);
snprintf(buf, sizeof(buf), "__stop_%s", s->name);
add_elf_sym(symtab_section,
s->data_offset, 0,
ELF32_ST_INFO(STB_GLOBAL, STT_NOTYPE), 0,
ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
s->sh_num, buf);
}
next_sec: ;
1060,15 → 1709,8
}
}
/* name of ELF interpreter */
#ifdef __FreeBSD__
static char elf_interp[] = "/usr/libexec/ld-elf.so.1";
#else
static char elf_interp[] = "/lib/ld-linux.so.2";
#endif
static void tcc_output_binary(TCCState *s1, FILE *f,
const int *section_order)
const int *sec_order)
{
Section *s;
int i, offset, size;
1075,7 → 1717,7
offset = 0;
for(i=1;i<s1->nb_sections;i++) {
s = s1->sections[section_order[i]];
s = s1->sections[sec_order[i]];
if (s->sh_type != SHT_NOBITS &&
(s->sh_flags & SHF_ALLOC)) {
while (offset < s->sh_offset) {
1089,105 → 1731,139
}
}
/* output an ELF file */
/* XXX: suppress unneeded sections */
int tcc_output_file(TCCState *s1, const char *filename)
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
#define HAVE_PHDR 1
#define EXTRA_RELITEMS 14
/* move the relocation value from .dynsym to .got */
void patch_dynsym_undef(TCCState *s1, Section *s)
{
Elf32_Ehdr ehdr;
FILE *f;
int fd, mode, ret;
int *section_order;
int shnum, i, phnum, file_offset, offset, size, j, tmp, sh_order_index, k;
unsigned long addr;
Section *strsec, *s;
Elf32_Shdr shdr, *sh;
Elf32_Phdr *phdr, *ph;
Section *interp, *dynamic, *dynstr;
unsigned long saved_dynamic_data_offset;
Elf32_Sym *sym;
int type, file_type;
unsigned long rel_addr, rel_size;
uint32_t *gotd = (void *)s1->got->data;
ElfW(Sym) *sym;
file_type = s1->output_type;
s1->nb_errors = 0;
if (file_type != TCC_OUTPUT_OBJ) {
tcc_add_runtime(s1);
gotd += 3; /* dummy entries in .got */
/* relocate symbols in .dynsym */
for_each_elem(s, 1, sym, ElfW(Sym)) {
if (sym->st_shndx == SHN_UNDEF) {
*gotd++ = sym->st_value + 6; /* XXX 6 is magic ? */
sym->st_value = 0;
}
}
}
#else
#define HAVE_PHDR 1
#define EXTRA_RELITEMS 9
phdr = NULL;
section_order = NULL;
interp = NULL;
dynamic = NULL;
dynstr = NULL; /* avoid warning */
saved_dynamic_data_offset = 0; /* avoid warning */
/* zero plt offsets of weak symbols in .dynsym */
void patch_dynsym_undef(TCCState *s1, Section *s)
{
ElfW(Sym) *sym;
if (file_type != TCC_OUTPUT_OBJ) {
relocate_common_syms();
for_each_elem(s, 1, sym, ElfW(Sym))
if (sym->st_shndx == SHN_UNDEF && ELFW(ST_BIND)(sym->st_info) == STB_WEAK)
sym->st_value = 0;
}
#endif
tcc_add_linker_symbols(s1);
ST_FUNC void fill_got_entry(TCCState *s1, ElfW_Rel *rel)
{
int sym_index = ELFW(R_SYM) (rel->r_info);
ElfW(Sym) *sym = &((ElfW(Sym) *) symtab_section->data)[sym_index];
unsigned long offset;
if (!s1->static_link) {
const char *name;
int sym_index, index;
Elf32_Sym *esym, *sym_end;
if (file_type == TCC_OUTPUT_EXE) {
char *ptr;
/* add interpreter section only if executable */
interp = new_section(s1, ".interp", SHT_PROGBITS, SHF_ALLOC);
interp->sh_addralign = 1;
ptr = section_ptr_add(interp, sizeof(elf_interp));
strcpy(ptr, elf_interp);
if (sym_index >= s1->nb_sym_attrs)
return;
offset = s1->sym_attrs[sym_index].got_offset;
section_reserve(s1->got, offset + PTR_SIZE);
#ifdef TCC_TARGET_X86_64
/* only works for x86-64 */
write32le(s1->got->data + offset + 4, sym->st_value >> 32);
#endif
write32le(s1->got->data + offset, sym->st_value & 0xffffffff);
}
/* add dynamic symbol table */
s1->dynsym = new_symtab(s1, ".dynsym", SHT_DYNSYM, SHF_ALLOC,
".dynstr",
".hash", SHF_ALLOC);
dynstr = s1->dynsym->link;
/* Perform relocation to GOT or PLT entries */
ST_FUNC void fill_got(TCCState *s1)
{
Section *s;
ElfW_Rel *rel;
int i;
/* add dynamic section */
dynamic = new_section(s1, ".dynamic", SHT_DYNAMIC,
SHF_ALLOC | SHF_WRITE);
dynamic->link = dynstr;
dynamic->sh_entsize = sizeof(Elf32_Dyn);
for(i = 1; i < s1->nb_sections; i++) {
s = s1->sections[i];
if (s->sh_type != SHT_RELX)
continue;
/* no need to handle got relocations */
if (s->link != symtab_section)
continue;
for_each_elem(s, 0, rel, ElfW_Rel) {
switch (ELFW(R_TYPE) (rel->r_info)) {
case R_X86_64_GOT32:
case R_X86_64_GOTPCREL:
case R_X86_64_GOTPCRELX:
case R_X86_64_REX_GOTPCRELX:
case R_X86_64_PLT32:
fill_got_entry(s1, rel);
break;
}
}
}
}
/* add PLT */
s1->plt = new_section(s1, ".plt", SHT_PROGBITS,
SHF_ALLOC | SHF_EXECINSTR);
s1->plt->sh_entsize = 4;
/* Bind symbols of executable: resolve undefined symbols from exported symbols
in shared libraries and export non local defined symbols to shared libraries
if -rdynamic switch was given on command line */
static void bind_exe_dynsyms(TCCState *s1)
{
const char *name;
int sym_index, index;
ElfW(Sym) *sym, *esym;
int type;
build_got(s1);
/* scan for undefined symbols and see if they are in the
dynamic symbols. If a symbol STT_FUNC is found, then we
add it in the PLT. If a symbol STT_OBJECT is found, we
add it in the .bss section with a suitable relocation */
sym_end = (Elf32_Sym *)(symtab_section->data +
symtab_section->data_offset);
if (file_type == TCC_OUTPUT_EXE) {
for(sym = (Elf32_Sym *)symtab_section->data + 1;
sym < sym_end;
sym++) {
/* Resolve undefined symbols from dynamic symbols. When there is a match:
- if STT_FUNC or STT_GNU_IFUNC symbol -> add it in PLT
- if STT_OBJECT symbol -> add it in .bss section with suitable reloc */
for_each_elem(symtab_section, 1, sym, ElfW(Sym)) {
if (sym->st_shndx == SHN_UNDEF) {
name = symtab_section->link->data + sym->st_name;
name = (char *) symtab_section->link->data + sym->st_name;
sym_index = find_elf_sym(s1->dynsymtab_section, name);
if (sym_index) {
esym = &((Elf32_Sym *)s1->dynsymtab_section->data)[sym_index];
type = ELF32_ST_TYPE(esym->st_info);
if (type == STT_FUNC) {
esym = &((ElfW(Sym) *)s1->dynsymtab_section->data)[sym_index];
type = ELFW(ST_TYPE)(esym->st_info);
if ((type == STT_FUNC) || (type == STT_GNU_IFUNC)) {
/* Indirect functions shall have STT_FUNC type in executable
* dynsym section. Indeed, a dlsym call following a lazy
* resolution would pick the symbol value from the
* executable dynsym entry which would contain the address
* of the function wanted by the caller of dlsym instead of
* the address of the function that would return that
* address */
put_got_entry(s1, R_JMP_SLOT, esym->st_size,
esym->st_info,
sym - (Elf32_Sym *)symtab_section->data);
ELFW(ST_INFO)(STB_GLOBAL,STT_FUNC),
sym - (ElfW(Sym) *)symtab_section->data);
} else if (type == STT_OBJECT) {
unsigned long offset;
ElfW(Sym) *dynsym;
offset = bss_section->data_offset;
/* XXX: which alignment ? */
offset = (offset + 16 - 1) & -16;
index = put_elf_sym(s1->dynsym, offset, esym->st_size,
esym->st_info, 0,
bss_section->sh_num, name);
esym->st_info, 0, bss_section->sh_num,
name);
/* Ensure R_COPY works for weak symbol aliases */
if (ELFW(ST_BIND)(esym->st_info) == STB_WEAK) {
for_each_elem(s1->dynsymtab_section, 1, dynsym, ElfW(Sym)) {
if ((dynsym->st_value == esym->st_value)
&& (ELFW(ST_BIND)(dynsym->st_info) == STB_GLOBAL)) {
char *dynname = (char *) s1->dynsymtab_section->link->data
+ dynsym->st_name;
put_elf_sym(s1->dynsym, offset, dynsym->st_size,
dynsym->st_info, 0,
bss_section->sh_num, dynname);
break;
}
}
}
put_elf_reloc(s1->dynsym, bss_section,
offset, R_COPY, index);
offset += esym->st_size;
1195,131 → 1871,160
}
} else {
/* STB_WEAK undefined symbols are accepted */
/* XXX: _fp_hw seems to be part of the ABI, so we ignore
it */
if (ELF32_ST_BIND(sym->st_info) == STB_WEAK ||
/* XXX: _fp_hw seems to be part of the ABI, so we ignore it */
if (ELFW(ST_BIND)(sym->st_info) == STB_WEAK ||
!strcmp(name, "_fp_hw")) {
} else {
error_noabort("undefined symbol '%s'", name);
tcc_error_noabort("undefined symbol '%s'", name);
}
}
} else if (s1->rdynamic &&
ELF32_ST_BIND(sym->st_info) != STB_LOCAL) {
/* if -rdynamic option, then export all non
local symbols */
name = symtab_section->link->data + sym->st_name;
put_elf_sym(s1->dynsym, sym->st_value, sym->st_size,
sym->st_info, 0,
sym->st_shndx, name);
} else if (s1->rdynamic && ELFW(ST_BIND)(sym->st_info) != STB_LOCAL) {
/* if -rdynamic option, then export all non local symbols */
name = (char *) symtab_section->link->data + sym->st_name;
put_elf_sym(s1->dynsym, sym->st_value, sym->st_size, sym->st_info,
0, sym->st_shndx, name);
}
}
}
if (s1->nb_errors)
goto fail;
/* Bind symbols of libraries: export non local symbols of executable that
resolve undefined symbols of shared libraries */
static void bind_libs_dynsyms(TCCState *s1)
{
const char *name;
int sym_index;
ElfW(Sym) *sym, *esym;
/* now look at unresolved dynamic symbols and export
corresponding symbol */
sym_end = (Elf32_Sym *)(s1->dynsymtab_section->data +
s1->dynsymtab_section->data_offset);
for(esym = (Elf32_Sym *)s1->dynsymtab_section->data + 1;
esym < sym_end;
esym++) {
if (esym->st_shndx == SHN_UNDEF) {
name = s1->dynsymtab_section->link->data + esym->st_name;
for_each_elem(s1->dynsymtab_section, 1, esym, ElfW(Sym)) {
name = (char *) s1->dynsymtab_section->link->data + esym->st_name;
sym_index = find_elf_sym(symtab_section, name);
if (sym_index) {
/* XXX: avoid adding a symbol if already
present because of -rdynamic ? */
sym = &((Elf32_Sym *)symtab_section->data)[sym_index];
/* XXX: avoid adding a symbol if already present because of
-rdynamic ? */
sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
if (sym->st_shndx != SHN_UNDEF)
put_elf_sym(s1->dynsym, sym->st_value, sym->st_size,
sym->st_info, 0,
sym->st_shndx, name);
} else {
if (ELF32_ST_BIND(esym->st_info) == STB_WEAK) {
sym->st_info, 0, sym->st_shndx, name);
} else if (esym->st_shndx == SHN_UNDEF) {
/* weak symbols can stay undefined */
} else {
warning("undefined dynamic symbol '%s'", name);
if (ELFW(ST_BIND)(esym->st_info) != STB_WEAK)
tcc_warning("undefined dynamic symbol '%s'", name);
}
}
}
}
} else {
int nb_syms;
/* shared library case : we simply export all the global symbols */
nb_syms = symtab_section->data_offset / sizeof(Elf32_Sym);
/* Export all non local symbols (for shared libraries) */
static void export_global_syms(TCCState *s1)
{
int nb_syms, dynindex, index;
const char *name;
ElfW(Sym) *sym;
nb_syms = symtab_section->data_offset / sizeof(ElfW(Sym));
s1->symtab_to_dynsym = tcc_mallocz(sizeof(int) * nb_syms);
for(sym = (Elf32_Sym *)symtab_section->data + 1;
sym < sym_end;
sym++) {
if (ELF32_ST_BIND(sym->st_info) != STB_LOCAL) {
name = symtab_section->link->data + sym->st_name;
index = put_elf_sym(s1->dynsym, sym->st_value, sym->st_size,
sym->st_info, 0,
sym->st_shndx, name);
s1->symtab_to_dynsym[sym -
(Elf32_Sym *)symtab_section->data] =
index;
for_each_elem(symtab_section, 1, sym, ElfW(Sym)) {
if (ELFW(ST_BIND)(sym->st_info) != STB_LOCAL) {
name = (char *) symtab_section->link->data + sym->st_name;
dynindex = put_elf_sym(s1->dynsym, sym->st_value, sym->st_size,
sym->st_info, 0, sym->st_shndx, name);
index = sym - (ElfW(Sym) *) symtab_section->data;
s1->symtab_to_dynsym[index] = dynindex;
}
}
}
build_got_entries(s1);
/* relocate the PLT: compute addresses and offsets in the PLT now that final
address for PLT and GOT are known (see fill_program_header) */
ST_FUNC void relocate_plt(TCCState *s1)
{
uint8_t *p, *p_end;
/* add a list of needed dlls */
for(i = 0; i < s1->nb_loaded_dlls; i++) {
DLLReference *dllref = s1->loaded_dlls[i];
if (dllref->level == 0)
put_dt(dynamic, DT_NEEDED, put_elf_str(dynstr, dllref->name));
}
/* XXX: currently, since we do not handle PIC code, we
must relocate the readonly segments */
if (file_type == TCC_OUTPUT_DLL)
put_dt(dynamic, DT_TEXTREL, 0);
if (!s1->plt)
return;
/* add necessary space for other entries */
saved_dynamic_data_offset = dynamic->data_offset;
dynamic->data_offset += 8 * 9;
} else {
/* still need to build got entries in case of static link */
build_got_entries(s1);
p = s1->plt->data;
p_end = p + s1->plt->data_offset;
if (p < p_end) {
#if defined(TCC_TARGET_I386)
write32le(p + 2, read32le(p + 2) + s1->got->sh_addr);
write32le(p + 8, read32le(p + 8) + s1->got->sh_addr);
p += 16;
while (p < p_end) {
write32le(p + 2, read32le(p + 2) + s1->got->sh_addr);
p += 16;
}
#elif defined(TCC_TARGET_X86_64)
int x = s1->got->sh_addr - s1->plt->sh_addr - 6;
write32le(p + 2, read32le(p + 2) + x);
write32le(p + 8, read32le(p + 8) + x - 6);
p += 16;
while (p < p_end) {
write32le(p + 2, read32le(p + 2) + x + s1->plt->data - p);
p += 16;
}
#elif defined(TCC_TARGET_ARM)
int x;
x=s1->got->sh_addr - s1->plt->sh_addr - 12;
p += 16;
while (p < p_end) {
if (read32le(p) == 0x46c04778) /* PLT Thumb stub present */
p += 4;
write32le(p + 12, x + read32le(p + 12) + s1->plt->data - p);
p += 16;
}
#elif defined(TCC_TARGET_ARM64)
uint64_t plt = s1->plt->sh_addr;
uint64_t got = s1->got->sh_addr;
uint64_t off = (got >> 12) - (plt >> 12);
if ((off + ((uint32_t)1 << 20)) >> 21)
tcc_error("Failed relocating PLT (off=0x%lx, got=0x%lx, plt=0x%lx)", off, got, plt);
write32le(p, 0xa9bf7bf0); // stp x16,x30,[sp,#-16]!
write32le(p + 4, (0x90000010 | // adrp x16,...
(off & 0x1ffffc) << 3 | (off & 3) << 29));
write32le(p + 8, (0xf9400211 | // ldr x17,[x16,#...]
(got & 0xff8) << 7));
write32le(p + 12, (0x91000210 | // add x16,x16,#...
(got & 0xfff) << 10));
write32le(p + 16, 0xd61f0220); // br x17
write32le(p + 20, 0xd503201f); // nop
write32le(p + 24, 0xd503201f); // nop
write32le(p + 28, 0xd503201f); // nop
p += 32;
while (p < p_end) {
uint64_t pc = plt + (p - s1->plt->data);
uint64_t addr = got + read64le(p);
uint64_t off = (addr >> 12) - (pc >> 12);
if ((off + ((uint32_t)1 << 20)) >> 21)
tcc_error("Failed relocating PLT (off=0x%lx, addr=0x%lx, pc=0x%lx)", off, addr, pc);
write32le(p, (0x90000010 | // adrp x16,...
(off & 0x1ffffc) << 3 | (off & 3) << 29));
write32le(p + 4, (0xf9400211 | // ldr x17,[x16,#...]
(addr & 0xff8) << 7));
write32le(p + 8, (0x91000210 | // add x16,x16,#...
(addr & 0xfff) << 10));
write32le(p + 12, 0xd61f0220); // br x17
p += 16;
}
#elif defined(TCC_TARGET_C67)
/* XXX: TODO */
#else
#error unsupported CPU
#endif
}
}
memset(&ehdr, 0, sizeof(ehdr));
/* Allocate strings for section names and decide if an unallocated section
should be output.
/* we add a section for symbols */
strsec = new_section(s1, ".shstrtab", SHT_STRTAB, 0);
put_elf_str(strsec, "");
NOTE: the strsec section comes last, so its size is also correct ! */
static void alloc_sec_names(TCCState *s1, int file_type, Section *strsec)
{
int i;
Section *s;
/* compute number of sections */
shnum = s1->nb_sections;
/* this array is used to reorder sections in the output file */
section_order = tcc_malloc(sizeof(int) * shnum);
section_order[0] = 0;
sh_order_index = 1;
/* compute number of program headers */
switch(file_type) {
default:
case TCC_OUTPUT_OBJ:
phnum = 0;
break;
case TCC_OUTPUT_EXE:
if (!s1->static_link)
phnum = 4;
else
phnum = 2;
break;
case TCC_OUTPUT_DLL:
phnum = 3;
break;
}
/* allocate strings for section names and decide if an unallocated
section should be output */
/* NOTE: the strsec section comes last, so its size is also
correct ! */
/* Allocate strings for section names */
for(i = 1; i < s1->nb_sections; i++) {
s = s1->sections[i];
s->sh_name = put_elf_str(strsec, s->name);
1326,11 → 2031,16
/* when generating a DLL, we include relocations but we may
patch them */
if (file_type == TCC_OUTPUT_DLL &&
s->sh_type == SHT_REL &&
s->sh_type == SHT_RELX &&
!(s->sh_flags & SHF_ALLOC)) {
/* gr: avoid bogus relocs for empty (debug) sections */
if (s1->sections[s->sh_info]->sh_flags & SHF_ALLOC)
prepare_dynamic_rel(s1, s);
} else if (do_debug ||
else if (s1->do_debug)
s->sh_size = s->data_offset;
} else if (s1->do_debug ||
file_type == TCC_OUTPUT_OBJ ||
file_type == TCC_OUTPUT_EXE ||
(s->sh_flags & SHF_ALLOC) ||
i == (s1->nb_sections - 1)) {
/* we output all sections if debug or object file */
1337,26 → 2047,53
s->sh_size = s->data_offset;
}
}
}
/* allocate program segment headers */
phdr = tcc_mallocz(phnum * sizeof(Elf32_Phdr));
/* Info to be copied in dynamic section */
struct dyn_inf {
Section *dynamic;
Section *dynstr;
unsigned long dyn_rel_off;
addr_t rel_addr;
addr_t rel_size;
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
addr_t bss_addr;
addr_t bss_size;
#endif
};
if (s1->output_format == TCC_OUTPUT_FORMAT_ELF) {
file_offset = sizeof(Elf32_Ehdr) + phnum * sizeof(Elf32_Phdr);
} else {
/* Assign sections to segments and decide how are sections laid out when loaded
in memory. This function also fills corresponding program headers. */
static int layout_sections(TCCState *s1, ElfW(Phdr) *phdr, int phnum,
Section *interp, Section* strsec,
struct dyn_inf *dyninf, int *sec_order)
{
int i, j, k, file_type, sh_order_index, file_offset;
unsigned long s_align;
long long tmp;
addr_t addr;
ElfW(Phdr) *ph;
Section *s;
file_type = s1->output_type;
sh_order_index = 1;
file_offset = 0;
}
if (s1->output_format == TCC_OUTPUT_FORMAT_ELF)
file_offset = sizeof(ElfW(Ehdr)) + phnum * sizeof(ElfW(Phdr));
s_align = ELF_PAGE_SIZE;
if (s1->section_align)
s_align = s1->section_align;
if (phnum > 0) {
/* compute section to program header mapping */
if (s1->has_text_addr) {
int a_offset, p_offset;
addr = s1->text_addr;
/* we ensure that (addr % ELF_PAGE_SIZE) == file_offset %
ELF_PAGE_SIZE */
a_offset = addr & (ELF_PAGE_SIZE - 1);
p_offset = file_offset & (ELF_PAGE_SIZE - 1);
a_offset = (int) (addr & (s_align - 1));
p_offset = file_offset & (s_align - 1);
if (a_offset < p_offset)
a_offset += ELF_PAGE_SIZE;
a_offset += s_align;
file_offset += (a_offset - p_offset);
} else {
if (file_type == TCC_OUTPUT_DLL)
1364,18 → 2101,22
else
addr = ELF_START_ADDR;
/* compute address after headers */
addr += (file_offset & (ELF_PAGE_SIZE - 1));
addr += (file_offset & (s_align - 1));
}
/* dynamic relocation table information, for .dynamic section */
rel_size = 0;
rel_addr = 0;
/* leave one program header for the program interpreter */
ph = &phdr[0];
/* Leave one program headers for the program interpreter and one for
the program header table itself if needed. These are done later as
they require section layout to be done first. */
if (interp)
ph++;
ph += 1 + HAVE_PHDR;
/* dynamic relocation table information, for .dynamic section */
dyninf->rel_addr = dyninf->rel_size = 0;
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
dyninf->bss_addr = dyninf->bss_size = 0;
#endif
for(j = 0; j < 2; j++) {
ph->p_type = PT_LOAD;
if (j == 0)
1382,10 → 2123,12
ph->p_flags = PF_R | PF_X;
else
ph->p_flags = PF_R | PF_W;
ph->p_align = ELF_PAGE_SIZE;
ph->p_align = s_align;
/* we do the following ordering: interp, symbol tables,
relocations, progbits, nobits */
/* Decide the layout of sections loaded in memory. This must
be done before program headers are filled since they contain
info about the layout. We do the following ordering: interp,
symbol tables, relocations, progbits, nobits */
/* XXX: do faster and simpler sorting */
for(k = 0; k < 5; k++) {
for(i = 1; i < s1->nb_sections; i++) {
1408,7 → 2151,7
s->sh_type == SHT_HASH) {
if (k != 1)
continue;
} else if (s->sh_type == SHT_REL) {
} else if (s->sh_type == SHT_RELX) {
if (k != 2)
continue;
} else if (s->sh_type == SHT_NOBITS) {
1418,13 → 2161,13
if (k != 3)
continue;
}
section_order[sh_order_index++] = i;
sec_order[sh_order_index++] = i;
/* section matches: we align it and add its size */
tmp = addr;
addr = (addr + s->sh_addralign - 1) &
~(s->sh_addralign - 1);
file_offset += addr - tmp;
file_offset += (int) ( addr - tmp );
s->sh_offset = file_offset;
s->sh_addr = addr;
1435,16 → 2178,36
ph->p_paddr = ph->p_vaddr;
}
/* update dynamic relocation infos */
if (s->sh_type == SHT_REL) {
if (rel_size == 0)
rel_addr = addr;
rel_size += s->sh_size;
if (s->sh_type == SHT_RELX) {
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
if (!strcmp(strsec->data + s->sh_name, ".rel.got")) {
dyninf->rel_addr = addr;
dyninf->rel_size += s->sh_size; /* XXX only first rel. */
}
if (!strcmp(strsec->data + s->sh_name, ".rel.bss")) {
dyninf->bss_addr = addr;
dyninf->bss_size = s->sh_size; /* XXX only first rel. */
}
#else
if (dyninf->rel_size == 0)
dyninf->rel_addr = addr;
dyninf->rel_size += s->sh_size;
#endif
}
addr += s->sh_size;
if (s->sh_type != SHT_NOBITS)
file_offset += s->sh_size;
}
}
if (j == 0) {
/* Make the first PT_LOAD segment include the program
headers itself (and the ELF header as well), it'll
come out with same memory use but will make various
tools like binutils strip work better. */
ph->p_offset &= ~(ph->p_align - 1);
ph->p_vaddr &= ~(ph->p_align - 1);
ph->p_paddr &= ~(ph->p_align - 1);
}
ph->p_filesz = file_offset - ph->p_offset;
ph->p_memsz = addr - ph->p_vaddr;
ph++;
1452,20 → 2215,56
if (s1->output_format == TCC_OUTPUT_FORMAT_ELF) {
/* if in the middle of a page, we duplicate the page in
memory so that one copy is RX and the other is RW */
if ((addr & (ELF_PAGE_SIZE - 1)) != 0)
addr += ELF_PAGE_SIZE;
if ((addr & (s_align - 1)) != 0)
addr += s_align;
} else {
addr = (addr + ELF_PAGE_SIZE - 1) & ~(ELF_PAGE_SIZE - 1);
file_offset = (file_offset + ELF_PAGE_SIZE - 1) &
~(ELF_PAGE_SIZE - 1);
addr = (addr + s_align - 1) & ~(s_align - 1);
file_offset = (file_offset + s_align - 1) & ~(s_align - 1);
}
}
}
}
/* if interpreter, then add corresponing program header */
/* all other sections come after */
for(i = 1; i < s1->nb_sections; i++) {
s = s1->sections[i];
if (phnum > 0 && (s->sh_flags & SHF_ALLOC))
continue;
sec_order[sh_order_index++] = i;
file_offset = (file_offset + s->sh_addralign - 1) &
~(s->sh_addralign - 1);
s->sh_offset = file_offset;
if (s->sh_type != SHT_NOBITS)
file_offset += s->sh_size;
}
return file_offset;
}
static void fill_unloadable_phdr(ElfW(Phdr) *phdr, int phnum, Section *interp,
Section *dynamic)
{
ElfW(Phdr) *ph;
/* if interpreter, then add corresponding program header */
if (interp) {
ph = &phdr[0];
if (HAVE_PHDR)
{
int len = phnum * sizeof(ElfW(Phdr));
ph->p_type = PT_PHDR;
ph->p_offset = sizeof(ElfW(Ehdr));
ph->p_vaddr = interp->sh_addr - len;
ph->p_paddr = ph->p_vaddr;
ph->p_filesz = ph->p_memsz = len;
ph->p_flags = PF_R | PF_X;
ph->p_align = 4; /* interp->sh_addralign; */
ph++;
}
ph->p_type = PT_INTERP;
ph->p_offset = interp->sh_offset;
ph->p_vaddr = interp->sh_addr;
1476,10 → 2275,8
ph->p_align = interp->sh_addralign;
}
/* if dynamic section, then add corresponing program header */
/* if dynamic section, then add corresponding program header */
if (dynamic) {
Elf32_Sym *sym_end;
ph = &phdr[phnum - 1];
ph->p_type = PT_DYNAMIC;
1490,105 → 2287,71
ph->p_memsz = dynamic->sh_size;
ph->p_flags = PF_R | PF_W;
ph->p_align = dynamic->sh_addralign;
/* put GOT dynamic section address */
put32(s1->got->data, dynamic->sh_addr);
/* relocate the PLT */
if (file_type == TCC_OUTPUT_EXE) {
uint8_t *p, *p_end;
p = s1->plt->data;
p_end = p + s1->plt->data_offset;
if (p < p_end) {
#if defined(TCC_TARGET_I386)
put32(p + 2, get32(p + 2) + s1->got->sh_addr);
put32(p + 8, get32(p + 8) + s1->got->sh_addr);
p += 16;
while (p < p_end) {
put32(p + 2, get32(p + 2) + s1->got->sh_addr);
p += 16;
}
#elif defined(TCC_TARGET_ARM)
int x;
x=s1->got->sh_addr - s1->plt->sh_addr - 12;
p +=16;
while (p < p_end) {
put32(p + 12, x + get32(p + 12) + s1->plt->data - p);
p += 16;
}
#elif defined(TCC_TARGET_C67)
/* XXX: TODO */
#else
#error unsupported CPU
#endif
}
}
/* relocate symbols in .dynsym */
sym_end = (Elf32_Sym *)(s1->dynsym->data + s1->dynsym->data_offset);
for(sym = (Elf32_Sym *)s1->dynsym->data + 1;
sym < sym_end;
sym++) {
if (sym->st_shndx == SHN_UNDEF) {
/* relocate to the PLT if the symbol corresponds
to a PLT entry */
if (sym->st_value)
sym->st_value += s1->plt->sh_addr;
} else if (sym->st_shndx < SHN_LORESERVE) {
/* do symbol relocation */
sym->st_value += s1->sections[sym->st_shndx]->sh_addr;
}
}
/* Fill the dynamic section with tags describing the address and size of
sections */
static void fill_dynamic(TCCState *s1, struct dyn_inf *dyninf)
{
Section *dynamic;
dynamic = dyninf->dynamic;
/* put dynamic section entries */
dynamic->data_offset = saved_dynamic_data_offset;
dynamic->data_offset = dyninf->dyn_rel_off;
put_dt(dynamic, DT_HASH, s1->dynsym->hash->sh_addr);
put_dt(dynamic, DT_STRTAB, dynstr->sh_addr);
put_dt(dynamic, DT_STRTAB, dyninf->dynstr->sh_addr);
put_dt(dynamic, DT_SYMTAB, s1->dynsym->sh_addr);
put_dt(dynamic, DT_STRSZ, dynstr->data_offset);
put_dt(dynamic, DT_SYMENT, sizeof(Elf32_Sym));
put_dt(dynamic, DT_REL, rel_addr);
put_dt(dynamic, DT_RELSZ, rel_size);
put_dt(dynamic, DT_RELENT, sizeof(Elf32_Rel));
put_dt(dynamic, DT_STRSZ, dyninf->dynstr->data_offset);
put_dt(dynamic, DT_SYMENT, sizeof(ElfW(Sym)));
#if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
put_dt(dynamic, DT_RELA, dyninf->rel_addr);
put_dt(dynamic, DT_RELASZ, dyninf->rel_size);
put_dt(dynamic, DT_RELAENT, sizeof(ElfW_Rel));
#else
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
put_dt(dynamic, DT_PLTGOT, s1->got->sh_addr);
put_dt(dynamic, DT_PLTRELSZ, dyninf->rel_size);
put_dt(dynamic, DT_JMPREL, dyninf->rel_addr);
put_dt(dynamic, DT_PLTREL, DT_REL);
put_dt(dynamic, DT_REL, dyninf->bss_addr);
put_dt(dynamic, DT_RELSZ, dyninf->bss_size);
#else
put_dt(dynamic, DT_REL, dyninf->rel_addr);
put_dt(dynamic, DT_RELSZ, dyninf->rel_size);
put_dt(dynamic, DT_RELENT, sizeof(ElfW_Rel));
#endif
#endif
if (s1->do_debug)
put_dt(dynamic, DT_DEBUG, 0);
put_dt(dynamic, DT_NULL, 0);
}
ehdr.e_phentsize = sizeof(Elf32_Phdr);
ehdr.e_phnum = phnum;
ehdr.e_phoff = sizeof(Elf32_Ehdr);
}
/* Relocate remaining sections and symbols (that is those not related to
dynamic linking) */
static int final_sections_reloc(TCCState *s1)
{
int i;
Section *s;
/* all other sections come after */
for(i = 1; i < s1->nb_sections; i++) {
s = s1->sections[i];
if (phnum > 0 && (s->sh_flags & SHF_ALLOC))
continue;
section_order[sh_order_index++] = i;
file_offset = (file_offset + s->sh_addralign - 1) &
~(s->sh_addralign - 1);
s->sh_offset = file_offset;
if (s->sh_type != SHT_NOBITS)
file_offset += s->sh_size;
}
/* if building executable or DLL, then relocate each section
except the GOT which is already relocated */
if (file_type != TCC_OUTPUT_OBJ) {
relocate_syms(s1, 0);
if (s1->nb_errors != 0) {
fail:
ret = -1;
goto the_end;
}
if (s1->nb_errors != 0)
return -1;
/* relocate sections */
/* XXX: ignore sections with allocated relocations ? */
for(i = 1; i < s1->nb_sections; i++) {
s = s1->sections[i];
#ifdef TCC_TARGET_I386
if (s->reloc && s != s1->got && (s->sh_flags & SHF_ALLOC)) //gr
/* On X86 gdb 7.3 works in any case but gdb 6.6 will crash if SHF_ALLOC
checking is removed */
#else
if (s->reloc && s != s1->got)
/* On X86_64 gdb 7.3 will crash if SHF_ALLOC checking is present */
#endif
relocate_section(s1, s);
}
1597,38 → 2360,34
for(i = 1; i < s1->nb_sections; i++) {
s = s1->sections[i];
if ((s->sh_flags & SHF_ALLOC) &&
s->sh_type == SHT_REL) {
s->sh_type == SHT_RELX) {
relocate_rel(s1, s);
}
}
/* get entry point address */
if (file_type == TCC_OUTPUT_EXE)
ehdr.e_entry = (unsigned long)tcc_get_symbol_err(s1, "_start");
else
ehdr.e_entry = text_section->sh_addr; /* XXX: is it correct ? */
return 0;
}
/* write elf file */
if (file_type == TCC_OUTPUT_OBJ)
mode = 0666;
else
mode = 0777;
fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, mode);
if (fd < 0) {
error_noabort("could not write '%s'", filename);
goto fail;
/* Create an ELF file on disk.
This function handle ELF specific layout requirements */
static void tcc_output_elf(TCCState *s1, FILE *f, int phnum, ElfW(Phdr) *phdr,
int file_offset, int *sec_order)
{
int i, shnum, offset, size, file_type;
Section *s;
ElfW(Ehdr) ehdr;
ElfW(Shdr) shdr, *sh;
file_type = s1->output_type;
shnum = s1->nb_sections;
memset(&ehdr, 0, sizeof(ehdr));
if (phnum > 0) {
ehdr.e_phentsize = sizeof(ElfW(Phdr));
ehdr.e_phnum = phnum;
ehdr.e_phoff = sizeof(ElfW(Ehdr));
}
f = fdopen(fd, "wb");
#ifdef TCC_TARGET_COFF
if (s1->output_format == TCC_OUTPUT_FORMAT_COFF) {
tcc_output_coff(s1, f);
} else
#endif
if (s1->output_format == TCC_OUTPUT_FORMAT_ELF) {
sort_syms(s1, symtab_section);
/* align to 4 */
file_offset = (file_offset + 3) & -4;
1637,22 → 2396,35
ehdr.e_ident[1] = ELFMAG1;
ehdr.e_ident[2] = ELFMAG2;
ehdr.e_ident[3] = ELFMAG3;
ehdr.e_ident[4] = ELFCLASS32;
ehdr.e_ident[4] = ELFCLASSW;
ehdr.e_ident[5] = ELFDATA2LSB;
ehdr.e_ident[6] = EV_CURRENT;
#ifdef __FreeBSD__
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
ehdr.e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
#endif
#ifdef TCC_TARGET_ARM
#ifdef TCC_ARM_EABI
ehdr.e_ident[EI_OSABI] = 0;
ehdr.e_flags = EF_ARM_EABI_VER4;
if (file_type == TCC_OUTPUT_EXE || file_type == TCC_OUTPUT_DLL)
ehdr.e_flags |= EF_ARM_HASENTRY;
if (s1->float_abi == ARM_HARD_FLOAT)
ehdr.e_flags |= EF_ARM_VFP_FLOAT;
else
ehdr.e_flags |= EF_ARM_SOFT_FLOAT;
#else
ehdr.e_ident[EI_OSABI] = ELFOSABI_ARM;
#endif
#endif
switch(file_type) {
default:
case TCC_OUTPUT_EXE:
ehdr.e_type = ET_EXEC;
ehdr.e_entry = get_elf_sym_addr(s1, "_start", 1);
break;
case TCC_OUTPUT_DLL:
ehdr.e_type = ET_DYN;
ehdr.e_entry = text_section->sh_addr; /* XXX: is it correct ? */
break;
case TCC_OUTPUT_OBJ:
ehdr.e_type = ET_REL;
1661,23 → 2433,27
ehdr.e_machine = EM_TCC_TARGET;
ehdr.e_version = EV_CURRENT;
ehdr.e_shoff = file_offset;
ehdr.e_ehsize = sizeof(Elf32_Ehdr);
ehdr.e_shentsize = sizeof(Elf32_Shdr);
ehdr.e_ehsize = sizeof(ElfW(Ehdr));
ehdr.e_shentsize = sizeof(ElfW(Shdr));
ehdr.e_shnum = shnum;
ehdr.e_shstrndx = shnum - 1;
fwrite(&ehdr, 1, sizeof(Elf32_Ehdr), f);
fwrite(phdr, 1, phnum * sizeof(Elf32_Phdr), f);
offset = sizeof(Elf32_Ehdr) + phnum * sizeof(Elf32_Phdr);
fwrite(&ehdr, 1, sizeof(ElfW(Ehdr)), f);
fwrite(phdr, 1, phnum * sizeof(ElfW(Phdr)), f);
offset = sizeof(ElfW(Ehdr)) + phnum * sizeof(ElfW(Phdr));
sort_syms(s1, symtab_section);
for(i=1;i<s1->nb_sections;i++) {
s = s1->sections[section_order[i]];
s = s1->sections[sec_order[i]];
if (s->sh_type != SHT_NOBITS) {
if (s->sh_type == SHT_DYNSYM)
patch_dynsym_undef(s1, s);
while (offset < s->sh_offset) {
fputc(0, f);
offset++;
}
size = s->sh_size;
if (size)
fwrite(s->data, 1, size, f);
offset += size;
}
1691,7 → 2467,7
for(i=0;i<s1->nb_sections;i++) {
sh = &shdr;
memset(sh, 0, sizeof(Elf32_Shdr));
memset(sh, 0, sizeof(ElfW(Shdr)));
s = s1->sections[i];
if (s) {
sh->sh_name = s->sh_name;
1706,22 → 2482,269
sh->sh_offset = s->sh_offset;
sh->sh_size = s->sh_size;
}
fwrite(sh, 1, sizeof(Elf32_Shdr), f);
fwrite(sh, 1, sizeof(ElfW(Shdr)), f);
}
} else {
tcc_output_binary(s1, f, section_order);
}
/* Write an elf, coff or "binary" file */
static int tcc_write_elf_file(TCCState *s1, const char *filename, int phnum,
ElfW(Phdr) *phdr, int file_offset, int *sec_order)
{
int fd, mode, file_type;
FILE *f;
file_type = s1->output_type;
if (file_type == TCC_OUTPUT_OBJ)
mode = 0666;
else
mode = 0777;
unlink(filename);
fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, mode);
if (fd < 0) {
tcc_error_noabort("could not write '%s'", filename);
return -1;
}
f = fdopen(fd, "wb");
if (s1->verbose)
printf("<- %s\n", filename);
#ifdef TCC_TARGET_COFF
if (s1->output_format == TCC_OUTPUT_FORMAT_COFF)
tcc_output_coff(s1, f);
else
#endif
if (s1->output_format == TCC_OUTPUT_FORMAT_ELF)
tcc_output_elf(s1, f, phnum, phdr, file_offset, sec_order);
else
tcc_output_binary(s1, f, sec_order);
fclose(f);
ret = 0;
return 0;
}
/* Output an elf, coff or binary file */
/* XXX: suppress unneeded sections */
static int elf_output_file(TCCState *s1, const char *filename)
{
int i, ret, phnum, shnum, file_type, file_offset, *sec_order;
struct dyn_inf dyninf;
ElfW(Phdr) *phdr;
ElfW(Sym) *sym;
Section *strsec, *interp, *dynamic, *dynstr;
file_type = s1->output_type;
s1->nb_errors = 0;
/* if linking, also link in runtime libraries (libc, libgcc, etc.) */
if (file_type != TCC_OUTPUT_OBJ) {
tcc_add_runtime(s1);
}
phdr = NULL;
sec_order = NULL;
interp = dynamic = dynstr = NULL; /* avoid warning */
dyninf.dyn_rel_off = 0; /* avoid warning */
if (file_type != TCC_OUTPUT_OBJ) {
relocate_common_syms();
tcc_add_linker_symbols(s1);
if (!s1->static_link) {
if (file_type == TCC_OUTPUT_EXE) {
char *ptr;
/* allow override the dynamic loader */
const char *elfint = getenv("LD_SO");
if (elfint == NULL)
elfint = DEFAULT_ELFINTERP(s1);
/* add interpreter section only if executable */
interp = new_section(s1, ".interp", SHT_PROGBITS, SHF_ALLOC);
interp->sh_addralign = 1;
ptr = section_ptr_add(interp, 1 + strlen(elfint));
strcpy(ptr, elfint);
}
/* add dynamic symbol table */
s1->dynsym = new_symtab(s1, ".dynsym", SHT_DYNSYM, SHF_ALLOC,
".dynstr",
".hash", SHF_ALLOC);
dynstr = s1->dynsym->link;
/* add dynamic section */
dynamic = new_section(s1, ".dynamic", SHT_DYNAMIC,
SHF_ALLOC | SHF_WRITE);
dynamic->link = dynstr;
dynamic->sh_entsize = sizeof(ElfW(Dyn));
build_got(s1);
if (file_type == TCC_OUTPUT_EXE) {
bind_exe_dynsyms(s1);
if (s1->nb_errors) {
ret = -1;
goto the_end;
}
bind_libs_dynsyms(s1);
} else /* shared library case: simply export all global symbols */
export_global_syms(s1);
build_got_entries(s1);
/* add a list of needed dlls */
for(i = 0; i < s1->nb_loaded_dlls; i++) {
DLLReference *dllref = s1->loaded_dlls[i];
if (dllref->level == 0)
put_dt(dynamic, DT_NEEDED, put_elf_str(dynstr, dllref->name));
}
if (s1->rpath)
put_dt(dynamic, DT_RPATH, put_elf_str(dynstr, s1->rpath));
/* XXX: currently, since we do not handle PIC code, we
must relocate the readonly segments */
if (file_type == TCC_OUTPUT_DLL) {
if (s1->soname)
put_dt(dynamic, DT_SONAME, put_elf_str(dynstr, s1->soname));
put_dt(dynamic, DT_TEXTREL, 0);
}
if (s1->symbolic)
put_dt(dynamic, DT_SYMBOLIC, 0);
/* add necessary space for other entries */
dyninf.dyn_rel_off = dynamic->data_offset;
dynamic->data_offset += sizeof(ElfW(Dyn)) * EXTRA_RELITEMS;
} else {
/* still need to build got entries in case of static link */
build_got_entries(s1);
}
}
/* we add a section for symbols */
strsec = new_section(s1, ".shstrtab", SHT_STRTAB, 0);
put_elf_str(strsec, "");
/* compute number of sections */
shnum = s1->nb_sections;
/* this array is used to reorder sections in the output file */
sec_order = tcc_malloc(sizeof(int) * shnum);
sec_order[0] = 0;
/* compute number of program headers */
switch(file_type) {
default:
case TCC_OUTPUT_OBJ:
phnum = 0;
break;
case TCC_OUTPUT_EXE:
if (!s1->static_link)
phnum = 4 + HAVE_PHDR;
else
phnum = 2;
break;
case TCC_OUTPUT_DLL:
phnum = 3;
break;
}
/* Allocate strings for section names */
alloc_sec_names(s1, file_type, strsec);
/* allocate program segment headers */
phdr = tcc_mallocz(phnum * sizeof(ElfW(Phdr)));
/* compute section to program header mapping */
file_offset = layout_sections(s1, phdr, phnum, interp, strsec, &dyninf,
sec_order);
/* Fill remaining program header and finalize relocation related to dynamic
linking. */
if (phnum > 0) {
fill_unloadable_phdr(phdr, phnum, interp, dynamic);
if (dynamic) {
dyninf.dynamic = dynamic;
dyninf.dynstr = dynstr;
fill_dynamic(s1, &dyninf);
/* put in GOT the dynamic section address and relocate PLT */
write32le(s1->got->data, dynamic->sh_addr);
if (file_type == TCC_OUTPUT_EXE
#if defined(TCC_OUTPUT_DLL_WITH_PLT)
|| file_type == TCC_OUTPUT_DLL
#endif
)
relocate_plt(s1);
/* relocate symbols in .dynsym now that final addresses are known */
for_each_elem(s1->dynsym, 1, sym, ElfW(Sym)) {
if (sym->st_shndx == SHN_UNDEF) {
/* relocate to PLT if symbol corresponds to a PLT entry,
but not if it's a weak symbol */
if (ELFW(ST_BIND)(sym->st_info) == STB_WEAK)
sym->st_value = 0;
else if (sym->st_value)
sym->st_value += s1->plt->sh_addr;
} else if (sym->st_shndx < SHN_LORESERVE) {
/* do symbol relocation */
sym->st_value += s1->sections[sym->st_shndx]->sh_addr;
}
}
}
}
/* if building executable or DLL, then relocate each section
except the GOT which is already relocated */
if (file_type != TCC_OUTPUT_OBJ) {
ret = final_sections_reloc(s1);
if (ret)
goto the_end;
}
/* Perform relocation to GOT or PLT entries */
if (file_type == TCC_OUTPUT_EXE && s1->static_link)
fill_got(s1);
/* Create the ELF file with name 'filename' */
ret = tcc_write_elf_file(s1, filename, phnum, phdr, file_offset, sec_order);
if (s1->do_strip) {
int rc;
const char *strip_cmd = "sstrip "; // super strip utility from ELFkickers
const char *null_dev = " 2> /dev/null";
char buf[1050];
snprintf(buf, sizeof(buf), "%s%s%s", strip_cmd, filename, null_dev);
rc = system(buf);
if (rc)
system(buf+1); // call a strip utility from binutils
}
the_end:
tcc_free(s1->symtab_to_dynsym);
tcc_free(section_order);
tcc_free(sec_order);
tcc_free(phdr);
tcc_free(s1->got_offsets);
tcc_free(s1->sym_attrs);
s1->sym_attrs = NULL;
return ret;
}
LIBTCCAPI int tcc_output_file(TCCState *s, const char *filename)
{
int ret;
#ifdef TCC_TARGET_PE
if (s->output_type != TCC_OUTPUT_OBJ) {
ret = pe_output_file(s, filename);
} else
#elif defined TCC_TARGET_MEOS
if (s->output_type != TCC_OUTPUT_OBJ) {
ret = tcc_output_me(s, filename);
} else
#endif
ret = elf_output_file(s, filename);
return ret;
}
static void *load_data(int fd, unsigned long file_offset, unsigned long size)
{
void *data;
1741,20 → 2764,25
/* load an object file and merge it with current files */
/* XXX: handle correctly stab (debug) info */
static int tcc_load_object_file(TCCState *s1,
ST_FUNC int tcc_load_object_file(TCCState *s1,
int fd, unsigned long file_offset)
{
Elf32_Ehdr ehdr;
Elf32_Shdr *shdr, *sh;
ElfW(Ehdr) ehdr;
ElfW(Shdr) *shdr, *sh;
int size, i, j, offset, offseti, nb_syms, sym_index, ret;
unsigned char *strsec, *strtab;
int *old_to_new_syms;
char *sh_name, *name;
SectionMergeInfo *sm_table, *sm;
Elf32_Sym *sym, *symtab;
Elf32_Rel *rel, *rel_end;
ElfW(Sym) *sym, *symtab;
ElfW_Rel *rel;
Section *s;
int stab_index;
int stabstr_index;
stab_index = stabstr_index = 0;
if (read(fd, &ehdr, sizeof(ehdr)) != sizeof(ehdr))
goto fail1;
if (ehdr.e_ident[0] != ELFMAG0 ||
1769,12 → 2797,12
if (ehdr.e_ident[5] != ELFDATA2LSB ||
ehdr.e_machine != EM_TCC_TARGET) {
fail1:
error_noabort("invalid object file");
tcc_error_noabort("invalid object file");
return -1;
}
/* read sections */
shdr = load_data(fd, file_offset + ehdr.e_shoff,
sizeof(Elf32_Shdr) * ehdr.e_shnum);
sizeof(ElfW(Shdr)) * ehdr.e_shnum);
sm_table = tcc_mallocz(sizeof(SectionMergeInfo) * ehdr.e_shnum);
/* load section names */
1790,12 → 2818,12
sh = &shdr[i];
if (sh->sh_type == SHT_SYMTAB) {
if (symtab) {
error_noabort("object must contain only one symtab");
tcc_error_noabort("object must contain only one symtab");
fail:
ret = -1;
goto the_end;
}
nb_syms = sh->sh_size / sizeof(Elf32_Sym);
nb_syms = sh->sh_size / sizeof(ElfW(Sym));
symtab = load_data(fd, file_offset + sh->sh_offset, sh->sh_size);
sm_table[i].s = symtab_section;
1812,11 → 2840,19
if (i == ehdr.e_shstrndx)
continue;
sh = &shdr[i];
sh_name = strsec + sh->sh_name;
sh_name = (char *) strsec + sh->sh_name;
/* ignore sections types we do not handle */
if (sh->sh_type != SHT_PROGBITS &&
sh->sh_type != SHT_REL &&
sh->sh_type != SHT_NOBITS)
sh->sh_type != SHT_RELX &&
#ifdef TCC_ARM_EABI
sh->sh_type != SHT_ARM_EXIDX &&
#endif
sh->sh_type != SHT_NOBITS &&
sh->sh_type != SHT_PREINIT_ARRAY &&
sh->sh_type != SHT_INIT_ARRAY &&
sh->sh_type != SHT_FINI_ARRAY &&
strcmp(sh_name, ".stabstr")
)
continue;
if (sh->sh_addralign < 1)
sh->sh_addralign = 1;
1846,17 → 2882,28
sm_table[i].new_section = 1;
found:
if (sh->sh_type != s->sh_type) {
error_noabort("invalid section type");
tcc_error_noabort("invalid section type");
goto fail;
}
/* align start of section */
offset = s->data_offset;
if (0 == strcmp(sh_name, ".stab")) {
stab_index = i;
goto no_align;
}
if (0 == strcmp(sh_name, ".stabstr")) {
stabstr_index = i;
goto no_align;
}
size = sh->sh_addralign - 1;
offset = (offset + size) & ~size;
if (sh->sh_addralign > s->sh_addralign)
s->sh_addralign = sh->sh_addralign;
s->data_offset = offset;
no_align:
sm_table[i].offset = offset;
sm_table[i].s = s;
/* concatenate sections */
1872,9 → 2919,20
next: ;
}
/* gr relocate stab strings */
if (stab_index && stabstr_index) {
Stab_Sym *a, *b;
unsigned o;
s = sm_table[stab_index].s;
a = (Stab_Sym *)(s->data + sm_table[stab_index].offset);
b = (Stab_Sym *)(s->data + s->data_offset);
o = sm_table[stabstr_index].offset;
while (a < b)
a->n_strx += o, a++;
}
/* second short pass to update sh_link and sh_info fields of new
sections */
sm = sm_table;
for(i = 1; i < ehdr.e_shnum; i++) {
s = sm_table[i].s;
if (!s || !sm_table[i].new_section)
1882,12 → 2940,13
sh = &shdr[i];
if (sh->sh_link > 0)
s->link = sm_table[sh->sh_link].s;
if (sh->sh_type == SHT_REL) {
if (sh->sh_type == SHT_RELX) {
s->sh_info = sm_table[sh->sh_info].s->sh_num;
/* update backward link */
s1->sections[s->sh_info]->reloc = s;
}
}
sm = sm_table;
/* resolve symbols */
old_to_new_syms = tcc_mallocz(nb_syms * sizeof(int));
1901,8 → 2960,8
/* if a symbol is in a link once section, we use the
already defined symbol. It is very important to get
correct relocations */
if (ELF32_ST_BIND(sym->st_info) != STB_LOCAL) {
name = strtab + sym->st_name;
if (ELFW(ST_BIND)(sym->st_info) != STB_LOCAL) {
name = (char *) strtab + sym->st_name;
sym_index = find_elf_sym(symtab_section, name);
if (sym_index)
old_to_new_syms[i] = sym_index;
1918,7 → 2977,7
sym->st_value += sm->offset;
}
/* add symbol */
name = strtab + sym->st_name;
name = (char *) strtab + sym->st_name;
sym_index = add_elf_sym(symtab_section, sym->st_value, sym->st_size,
sym->st_info, sym->st_other,
sym->st_shndx, name);
1933,30 → 2992,45
sh = &shdr[i];
offset = sm_table[i].offset;
switch(s->sh_type) {
case SHT_REL:
case SHT_RELX:
/* take relocation offset information */
offseti = sm_table[sh->sh_info].offset;
rel_end = (Elf32_Rel *)(s->data + s->data_offset);
for(rel = (Elf32_Rel *)(s->data + offset);
rel < rel_end;
rel++) {
for_each_elem(s, (offset / sizeof(*rel)), rel, ElfW_Rel) {
int type;
unsigned sym_index;
/* convert symbol index */
type = ELF32_R_TYPE(rel->r_info);
sym_index = ELF32_R_SYM(rel->r_info);
type = ELFW(R_TYPE)(rel->r_info);
sym_index = ELFW(R_SYM)(rel->r_info);
/* NOTE: only one symtab assumed */
if (sym_index >= nb_syms)
goto invalid_reloc;
sym_index = old_to_new_syms[sym_index];
if (!sym_index) {
/* ignore link_once in rel section. */
if (!sym_index && !sm->link_once
#ifdef TCC_TARGET_ARM
&& type != R_ARM_V4BX
#endif
) {
invalid_reloc:
error_noabort("Invalid relocation entry");
tcc_error_noabort("Invalid relocation entry [%2d] '%s' @ %.8x",
i, strsec + sh->sh_name, rel->r_offset);
goto fail;
}
rel->r_info = ELF32_R_INFO(sym_index, type);
rel->r_info = ELFW(R_INFO)(sym_index, type);
/* offset the relocation offset */
rel->r_offset += offseti;
#ifdef TCC_TARGET_ARM
/* Jumps and branches from a Thumb code to a PLT entry need
special handling since PLT entries are ARM code.
Unconditional bl instructions referencing PLT entries are
handled by converting these instructions into blx
instructions. Other case of instructions referencing a PLT
entry require to add a Thumb stub before the PLT entry to
switch to ARM mode. We set bit plt_thumb_stub of the
attribute of a symbol to indicate such a case. */
if (type == R_ARM_THM_JUMP24)
alloc_sym_attr(s1, sym_index)->plt_thumb_stub = 1;
#endif
}
break;
default:
1975,8 → 3049,6
return ret;
}
#define ARMAG "!<arch>\012" /* For COFF and a.out archives */
typedef struct ArchiveHeader {
char ar_name[16]; /* name of this member */
char ar_date[12]; /* file mtime */
1999,7 → 3071,7
uint8_t *data;
const char *ar_names, *p;
const uint8_t *ar_index;
Elf32_Sym *sym;
ElfW(Sym) *sym;
data = tcc_malloc(size);
if (read(fd, data, size) != size)
2006,7 → 3078,7
goto fail;
nsyms = get_be32(data);
ar_index = data + 4;
ar_names = ar_index + nsyms * 4;
ar_names = (char *) ar_index + nsyms * 4;
do {
bound = 0;
2013,12 → 3085,9
for(p = ar_names, i = 0; i < nsyms; i++, p += strlen(p)+1) {
sym_index = find_elf_sym(symtab_section, p);
if(sym_index) {
sym = &((Elf32_Sym *)symtab_section->data)[sym_index];
sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
if(sym->st_shndx == SHN_UNDEF) {
off = get_be32(ar_index + i * 4) + sizeof(ArchiveHeader);
#if 0
printf("%5d\t%s\t%08x\n", i, p, sym->st_shndx);
#endif
++bound;
lseek(fd, off, SEEK_SET);
if(tcc_load_object_file(s1, fd, off) < 0) {
2037,7 → 3106,7
}
/* load a '.a' file */
static int tcc_load_archive(TCCState *s1, int fd)
ST_FUNC int tcc_load_archive(TCCState *s1, int fd)
{
ArchiveHeader hdr;
char ar_size[11];
2054,7 → 3123,7
if (len == 0)
break;
if (len != sizeof(hdr)) {
error_noabort("invalid archive");
tcc_error_noabort("invalid archive");
return -1;
}
memcpy(ar_size, hdr.ar_size, sizeof(hdr.ar_size));
2066,7 → 3135,6
break;
}
ar_name[i + 1] = '\0';
// printf("name='%s' size=%d %s\n", ar_name, size, ar_size);
file_offset = lseek(fd, 0, SEEK_CUR);
/* align to even */
size = (size + 1) & ~1;
2088,18 → 3156,19
return 0;
}
#if !defined(TCC_TARGET_PE) && !defined(TCC_TARGET_MEOS)
/* load a DLL and all referenced DLLs. 'level = 0' means that the DLL
is referenced by the user (so it should be added as DT_NEEDED in
the generated ELF file) */
static int tcc_load_dll(TCCState *s1, int fd, const char *filename, int level)
ST_FUNC int tcc_load_dll(TCCState *s1, int fd, const char *filename, int level)
{
Elf32_Ehdr ehdr;
Elf32_Shdr *shdr, *sh, *sh1;
int i, nb_syms, nb_dts, sym_bind, ret;
Elf32_Sym *sym, *dynsym;
Elf32_Dyn *dt, *dynamic;
ElfW(Ehdr) ehdr;
ElfW(Shdr) *shdr, *sh, *sh1;
int i, j, nb_syms, nb_dts, sym_bind, ret;
ElfW(Sym) *sym, *dynsym;
ElfW(Dyn) *dt, *dynamic;
unsigned char *dynstr;
const char *name, *soname, *p;
const char *name, *soname;
DLLReference *dllref;
read(fd, &ehdr, sizeof(ehdr));
2107,12 → 3176,12
/* test CPU specific stuff */
if (ehdr.e_ident[5] != ELFDATA2LSB ||
ehdr.e_machine != EM_TCC_TARGET) {
error_noabort("bad architecture");
tcc_error_noabort("bad architecture");
return -1;
}
/* read sections */
shdr = load_data(fd, ehdr.e_shoff, sizeof(Elf32_Shdr) * ehdr.e_shnum);
shdr = load_data(fd, ehdr.e_shoff, sizeof(ElfW(Shdr)) * ehdr.e_shnum);
/* load dynamic section and dynamic symbols */
nb_syms = 0;
2123,11 → 3192,11
for(i = 0, sh = shdr; i < ehdr.e_shnum; i++, sh++) {
switch(sh->sh_type) {
case SHT_DYNAMIC:
nb_dts = sh->sh_size / sizeof(Elf32_Dyn);
nb_dts = sh->sh_size / sizeof(ElfW(Dyn));
dynamic = load_data(fd, sh->sh_offset, sh->sh_size);
break;
case SHT_DYNSYM:
nb_syms = sh->sh_size / sizeof(Elf32_Sym);
nb_syms = sh->sh_size / sizeof(ElfW(Sym));
dynsym = load_data(fd, sh->sh_offset, sh->sh_size);
sh1 = &shdr[sh->sh_link];
dynstr = load_data(fd, sh1->sh_offset, sh1->sh_size);
2138,14 → 3207,11
}
/* compute the real library name */
soname = filename;
p = strrchr(soname, '/');
if (p)
soname = p + 1;
soname = tcc_basename(filename);
for(i = 0, dt = dynamic; i < nb_dts; i++, dt++) {
if (dt->d_tag == DT_SONAME) {
soname = dynstr + dt->d_un.d_val;
soname = (char *) dynstr + dt->d_un.d_val;
}
}
2161,10 → 3227,8
}
}
// printf("loading dll '%s'\n", soname);
/* add the dll and its level */
dllref = tcc_malloc(sizeof(DLLReference) + strlen(soname));
dllref = tcc_mallocz(sizeof(DLLReference) + strlen(soname));
dllref->level = level;
strcpy(dllref->name, soname);
dynarray_add((void ***)&s1->loaded_dlls, &s1->nb_loaded_dlls, dllref);
2171,10 → 3235,10
/* add dynamic symbols in dynsym_section */
for(i = 1, sym = dynsym + 1; i < nb_syms; i++, sym++) {
sym_bind = ELF32_ST_BIND(sym->st_info);
sym_bind = ELFW(ST_BIND)(sym->st_info);
if (sym_bind == STB_LOCAL)
continue;
name = dynstr + sym->st_name;
name = (char *) dynstr + sym->st_name;
add_elf_sym(s1->dynsymtab_section, sym->st_value, sym->st_size,
sym->st_info, sym->st_other, sym->st_shndx, name);
}
2183,14 → 3247,14
for(i = 0, dt = dynamic; i < nb_dts; i++, dt++) {
switch(dt->d_tag) {
case DT_NEEDED:
name = dynstr + dt->d_un.d_val;
for(i = 0; i < s1->nb_loaded_dlls; i++) {
dllref = s1->loaded_dlls[i];
name = (char *) dynstr + dt->d_un.d_val;
for(j = 0; j < s1->nb_loaded_dlls; j++) {
dllref = s1->loaded_dlls[j];
if (!strcmp(name, dllref->name))
goto already_loaded;
}
if (tcc_add_dll(s1, name, AFF_REFERENCED_DLL) < 0) {
error_noabort("referenced dll '%s' not found", name);
tcc_error_noabort("referenced dll '%s' not found", name);
ret = -1;
goto the_end;
}
2224,12 → 3288,12
case '\v':
case '\r':
case '\n':
input();
inp();
goto redo;
case '/':
minp();
if (ch == '*') {
file->buf_ptr = parse_comment(file->buf_ptr);
file->buf_ptr = parse_comment(file->buf_ptr,0);
ch = file->buf_ptr[0];
goto redo;
} else {
2238,10 → 3302,66
goto parse_name;
}
break;
case 'a' ... 'z':
case 'A' ... 'Z':
case '\\':
ch = handle_eob();
if (ch != '\\')
goto redo;
/* fall through */
/* case 'a' ... 'z': */
case 'a':
case 'b':
case 'c':
case 'd':
case 'e':
case 'f':
case 'g':
case 'h':
case 'i':
case 'j':
case 'k':
case 'l':
case 'm':
case 'n':
case 'o':
case 'p':
case 'q':
case 'r':
case 's':
case 't':
case 'u':
case 'v':
case 'w':
case 'x':
case 'y':
case 'z':
/* case 'A' ... 'z': */
case 'A':
case 'B':
case 'C':
case 'D':
case 'E':
case 'F':
case 'G':
case 'H':
case 'I':
case 'J':
case 'K':
case 'L':
case 'M':
case 'N':
case 'O':
case 'P':
case 'Q':
case 'R':
case 'S':
case 'T':
case 'U':
case 'V':
case 'W':
case 'X':
case 'Y':
case 'Z':
case '_':
case '\\':
case '.':
case '$':
case '~':
2266,55 → 3386,125
break;
default:
c = ch;
input();
inp();
break;
}
#if 0
printf("tok=%c %d\n", c, c);
if (c == LD_TOK_NAME)
printf(" name=%s\n", name);
#endif
return c;
}
/* interpret a subset of GNU ldscripts to handle the dummy libc.so
files */
static int tcc_load_ldscript(TCCState *s1)
static int ld_add_file(TCCState *s1, const char filename[])
{
char cmd[64];
char filename[1024];
int t;
int ret;
ch = file->buf_ptr[0];
ch = handle_eob();
for(;;) {
t = ld_next(s1, cmd, sizeof(cmd));
if (t == LD_TOK_EOF)
return 0;
else if (t != LD_TOK_NAME)
return -1;
if (!strcmp(cmd, "INPUT") ||
!strcmp(cmd, "GROUP")) {
t = ld_next(s1, cmd, sizeof(cmd));
ret = tcc_add_file_internal(s1, filename, 0, TCC_FILETYPE_BINARY);
if (ret)
ret = tcc_add_dll(s1, filename, 0);
return ret;
}
static inline int new_undef_syms(void)
{
int ret = 0;
ret = new_undef_sym;
new_undef_sym = 0;
return ret;
}
static int ld_add_file_list(TCCState *s1, const char *cmd, int as_needed)
{
char filename[1024], libname[1024];
int t, group, nblibs = 0, ret = 0;
char **libs = NULL;
group = !strcmp(cmd, "GROUP");
if (!as_needed)
new_undef_syms();
t = ld_next(s1, filename, sizeof(filename));
if (t != '(')
expect("(");
t = ld_next(s1, filename, sizeof(filename));
for(;;) {
libname[0] = '\0';
if (t == LD_TOK_EOF) {
error_noabort("unexpected end of file");
return -1;
tcc_error_noabort("unexpected end of file");
ret = -1;
goto lib_parse_error;
} else if (t == ')') {
break;
} else if (t == '-') {
t = ld_next(s1, filename, sizeof(filename));
if ((t != LD_TOK_NAME) || (filename[0] != 'l')) {
tcc_error_noabort("library name expected");
ret = -1;
goto lib_parse_error;
}
pstrcpy(libname, sizeof libname, &filename[1]);
if (s1->static_link) {
snprintf(filename, sizeof filename, "lib%s.a", libname);
} else {
snprintf(filename, sizeof filename, "lib%s.so", libname);
}
} else if (t != LD_TOK_NAME) {
error_noabort("filename expected");
return -1;
tcc_error_noabort("filename expected");
ret = -1;
goto lib_parse_error;
}
tcc_add_file(s1, filename);
if (!strcmp(filename, "AS_NEEDED")) {
ret = ld_add_file_list(s1, cmd, 1);
if (ret)
goto lib_parse_error;
} else {
/* TODO: Implement AS_NEEDED support. Ignore it for now */
if (!as_needed) {
ret = ld_add_file(s1, filename);
if (ret)
goto lib_parse_error;
if (group) {
/* Add the filename *and* the libname to avoid future conversions */
dynarray_add((void ***) &libs, &nblibs, tcc_strdup(filename));
if (libname[0] != '\0')
dynarray_add((void ***) &libs, &nblibs, tcc_strdup(libname));
}
}
}
t = ld_next(s1, filename, sizeof(filename));
if (t == ',') {
t = ld_next(s1, filename, sizeof(filename));
}
}
if (group && !as_needed) {
while (new_undef_syms()) {
int i;
for (i = 0; i < nblibs; i ++)
ld_add_file(s1, libs[i]);
}
}
lib_parse_error:
dynarray_reset(&libs, &nblibs);
return ret;
}
/* interpret a subset of GNU ldscripts to handle the dummy libc.so
files */
ST_FUNC int tcc_load_ldscript(TCCState *s1)
{
char cmd[64];
char filename[1024];
int t, ret;
ch = handle_eob();
for(;;) {
t = ld_next(s1, cmd, sizeof(cmd));
if (t == LD_TOK_EOF)
return 0;
else if (t != LD_TOK_NAME)
return -1;
if (!strcmp(cmd, "INPUT") ||
!strcmp(cmd, "GROUP")) {
ret = ld_add_file_list(s1, cmd, 0);
if (ret)
return ret;
} else if (!strcmp(cmd, "OUTPUT_FORMAT") ||
!strcmp(cmd, "TARGET")) {
/* ignore some commands */
2324,7 → 3514,7
for(;;) {
t = ld_next(s1, filename, sizeof(filename));
if (t == LD_TOK_EOF) {
error_noabort("unexpected end of file");
tcc_error_noabort("unexpected end of file");
return -1;
} else if (t == ')') {
break;
2336,3 → 3526,4
}
return 0;
}
#endif /* !TCC_TARGET_PE */