| 0,0 → 1,60 |
|---|
| /* ---------------------------------------------- */ |
| /* alloca86_64.S */ |
| |
| .globl __bound_alloca |
| __bound_alloca: |
| |
| #ifdef TCC_TARGET_PE |
| # bound checking is not implemented |
| pop %rdx |
| mov %rcx,%rax |
| add $15,%rax |
| and $-16,%rax |
| jz p3 |
| |
| p1: |
| cmp $4096,%rax |
| jbe p2 |
| test %rax,-4096(%rsp) |
| sub $4096,%rsp |
| sub $4096,%rax |
| jmp p1 |
| p2: |
| |
| sub %rax,%rsp |
| mov %rsp,%rax |
| add $32,%rax |
| |
| p3: |
| push %rdx |
| ret |
| #else |
| pop %rdx |
| mov %rdi,%rax |
| movl %rax,%rsi # size, a second parm to the __bound_new_region |
| |
| add $15,%rax |
| and $-16,%rax |
| jz p3 |
| |
| |
| sub %rax,%rsp |
| mov %rsp,%rdi # pointer, a first parm to the __bound_new_region |
| mov %rsp,%rax |
| |
| push %rdx |
| push %rax |
| call __bound_new_region |
| pop %rax |
| pop %rdx |
| |
| p3: |
| push %rdx |
| ret |
| #endif |
| |
| /* mark stack as nonexecutable */ |
| #if defined __ELF__ && defined __linux__ |
| .section .note.GNU-stack,"",@progbits |
| #endif |
| /* ---------------------------------------------- */ |