diff options
| author | Uneven Prankster <unevenprankster@protonmail.com> | 2023-07-12 13:22:29 -0300 |
|---|---|---|
| committer | Uneven Prankster <unevenprankster@protonmail.com> | 2023-07-12 13:22:29 -0300 |
| commit | fa2bdd711212ba6b7a94a20971e8bfa281e73296 (patch) | |
| tree | 6713b3c0379507d49558287b71dd360ce188a2f0 /tinycc/lib/alloca-bt.S | |
lol
Diffstat (limited to 'tinycc/lib/alloca-bt.S')
| -rw-r--r-- | tinycc/lib/alloca-bt.S | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/tinycc/lib/alloca-bt.S b/tinycc/lib/alloca-bt.S new file mode 100644 index 0000000..c161488 --- /dev/null +++ b/tinycc/lib/alloca-bt.S @@ -0,0 +1,96 @@ +/* ---------------------------------------------- */ +/* alloca-bt.S */ + +#ifdef __leading_underscore +# define _(s) _##s +#else +# define _(s) s +#endif + +/* ---------------------------------------------- */ +#if defined __i386__ + +.globl _(__bound_alloca) +_(__bound_alloca): + pop %edx + pop %eax + mov %eax, %ecx + add $3+1,%eax + and $-4,%eax + jz p6 + +#ifdef _WIN32 +p4: + cmp $4096,%eax + jbe p5 + test %eax,-4096(%esp) + sub $4096,%esp + sub $4096,%eax + jmp p4 + +p5: +#endif + + sub %eax,%esp + mov %esp,%eax + + push %edx + push %eax + push %ecx + push %eax + call _(__bound_new_region) + add $8, %esp + pop %eax + pop %edx + +p6: + push %edx + push %edx + ret + +/* ---------------------------------------------- */ +#elif defined __x86_64__ + +.globl _(__bound_alloca) +_(__bound_alloca): +#ifdef _WIN32 + inc %rcx # add one extra to separate regions + jmp _(alloca) +.globl _(__bound_alloca_nr) +_(__bound_alloca_nr): + dec %rcx + push %rax + mov %rcx,%rdx + mov %rax,%rcx + sub $32,%rsp + call _(__bound_new_region) + add $32,%rsp + pop %rax + ret +#else + pop %rdx + mov %rdi,%rax + mov %rax,%rsi # size, a second parm to the __bound_new_region + + add $15 + 1,%rax # add one extra to separate regions + 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 + +/* ---------------------------------------------- */ +#endif |