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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1901 | serge | 1 | /* |
| 2 | * Mesa 3-D graphics library |
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| 3 | * Version: 7.9 |
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| 4 | * |
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| 5 | * Copyright (C) 2010 LunarG Inc. |
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| 6 | * |
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| 7 | * Permission is hereby granted, free of charge, to any person obtaining a |
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| 8 | * copy of this software and associated documentation files (the "Software"), |
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| 9 | * to deal in the Software without restriction, including without limitation |
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| 10 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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| 11 | * and/or sell copies of the Software, and to permit persons to whom the |
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| 12 | * Software is furnished to do so, subject to the following conditions: |
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| 13 | * |
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| 14 | * The above copyright notice and this permission notice shall be included |
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| 15 | * in all copies or substantial portions of the Software. |
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| 16 | * |
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| 17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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| 18 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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| 20 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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| 21 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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| 22 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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| 23 | * DEALINGS IN THE SOFTWARE. |
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| 24 | * |
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| 25 | * Authors: |
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| 26 | * Chia-I Wu |
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| 27 | */ |
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| 28 | |||
| 29 | #include |
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| 30 | #include "u_execmem.h" |
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| 31 | #include "u_macros.h" |
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| 32 | |||
| 33 | __asm__(".text"); |
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| 34 | |||
| 35 | __asm__("x86_current_tls:\n\t" |
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| 36 | "call 1f\n" |
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| 37 | "1:\n\t" |
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| 38 | "popl %eax\n\t" |
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| 39 | "addl $_GLOBAL_OFFSET_TABLE_+[.-1b], %eax\n\t" |
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| 40 | "movl u_current_table_tls@GOTNTPOFF(%eax), %eax\n\t" |
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| 41 | "ret"); |
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| 42 | |||
| 43 | #ifndef GLX_X86_READONLY_TEXT |
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| 44 | __asm__(".section wtext, \"awx\", @progbits\n" |
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| 45 | ".balign 16\n" |
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| 46 | "x86_entry_start:"); |
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| 47 | #endif /* GLX_X86_READONLY_TEXT */ |
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| 48 | |||
| 49 | #define STUB_ASM_ENTRY(func) \ |
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| 50 | ".globl " func "\n" \ |
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| 51 | ".type " func ", @function\n" \ |
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| 52 | ".balign 16\n" \ |
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| 53 | func ":" |
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| 54 | |||
| 55 | #define STUB_ASM_CODE(slot) \ |
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| 56 | "call x86_current_tls\n\t" \ |
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| 57 | "movl %gs:(%eax), %eax\n\t" \ |
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| 58 | "jmp *(4 * " slot ")(%eax)" |
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| 59 | |||
| 60 | #define MAPI_TMP_STUB_ASM_GCC |
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| 61 | #include "mapi_tmp.h" |
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| 62 | |||
| 63 | #ifndef GLX_X86_READONLY_TEXT |
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| 64 | __asm__(".balign 16\n" |
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| 65 | "x86_entry_end:"); |
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| 66 | __asm__(".text"); |
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| 67 | #endif /* GLX_X86_READONLY_TEXT */ |
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| 68 | |||
| 69 | extern unsigned long |
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| 70 | x86_current_tls(); |
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| 71 | |||
| 72 | void |
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| 73 | entry_patch_public(void) |
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| 74 | { |
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| 75 | #ifndef GLX_X86_READONLY_TEXT |
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| 76 | extern char x86_entry_start[]; |
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| 77 | extern char x86_entry_end[]; |
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| 78 | char patch[8] = { |
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| 79 | 0x65, 0xa1, 0x00, 0x00, 0x00, 0x00, /* movl %gs:0x0, %eax */ |
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| 80 | 0x90, 0x90 /* nop's */ |
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| 81 | }; |
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| 82 | char *entry; |
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| 83 | |||
| 84 | *((unsigned long *) (patch + 2)) = x86_current_tls(); |
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| 85 | |||
| 86 | for (entry = x86_entry_start; entry < x86_entry_end; entry += 16) |
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| 87 | memcpy(entry, patch, sizeof(patch)); |
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| 88 | #endif |
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| 89 | } |
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| 90 | |||
| 91 | void |
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| 92 | entry_patch(mapi_func entry, int slot) |
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| 93 | { |
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| 94 | char *code = (char *) entry; |
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| 95 | *((unsigned long *) (code + 8)) = slot * sizeof(mapi_func); |
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| 96 | } |
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| 97 | |||
| 98 | mapi_func |
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| 99 | entry_generate(int slot) |
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| 100 | { |
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| 101 | const char code_templ[16] = { |
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| 102 | 0x65, 0xa1, 0x00, 0x00, 0x00, 0x00, /* movl %gs:0x0, %eax */ |
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| 103 | 0xff, 0xa0, 0x34, 0x12, 0x00, 0x00, /* jmp *0x1234(%eax) */ |
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| 104 | 0x90, 0x90, 0x90, 0x90 /* nop's */ |
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| 105 | }; |
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| 106 | void *code; |
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| 107 | mapi_func entry; |
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| 108 | |||
| 109 | code = u_execmem_alloc(sizeof(code_templ)); |
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| 110 | if (!code) |
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| 111 | return NULL; |
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| 112 | |||
| 113 | memcpy(code, code_templ, sizeof(code_templ)); |
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| 114 | |||
| 115 | *((unsigned long *) (code + 2)) = x86_current_tls(); |
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| 116 | entry = (mapi_func) code; |
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| 117 | entry_patch(entry, slot); |
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| 118 | |||
| 119 | return entry; |
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| 120 | } |