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/win32/lib/chkstk.S | |
lol
Diffstat (limited to 'tinycc/win32/lib/chkstk.S')
| -rw-r--r-- | tinycc/win32/lib/chkstk.S | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/tinycc/win32/lib/chkstk.S b/tinycc/win32/lib/chkstk.S new file mode 100644 index 0000000..6f583a5 --- /dev/null +++ b/tinycc/win32/lib/chkstk.S @@ -0,0 +1,73 @@ +/* ---------------------------------------------- */ +/* chkstk86.s */ + +#ifdef __leading_underscore +# define _(s) _##s +#else +# define _(s) s +#endif + +/* ---------------------------------------------- */ +#ifndef __x86_64__ +/* ---------------------------------------------- */ + +.globl _(__chkstk) +_(__chkstk): + xchg (%esp),%ebp /* store ebp, get ret.addr */ + push %ebp /* push ret.addr */ + lea 4(%esp),%ebp /* setup frame ptr */ + push %ecx /* save ecx */ + mov %ebp,%ecx +P0: + sub $4096,%ecx + test %eax,(%ecx) + sub $4096,%eax + cmp $4096,%eax + jge P0 + sub %eax,%ecx + test %eax,(%ecx) + + mov %esp,%eax + mov %ecx,%esp + mov (%eax),%ecx /* restore ecx */ + jmp *4(%eax) + +/* ---------------------------------------------- */ +#else +/* ---------------------------------------------- */ + +.globl _(__chkstk) +_(__chkstk): + xchg (%rsp),%rbp /* store ebp, get ret.addr */ + push %rbp /* push ret.addr */ + lea 8(%rsp),%rbp /* setup frame ptr */ + push %rcx /* save ecx */ + mov %rbp,%rcx + movslq %eax,%rax +P0: + sub $4096,%rcx + test %rax,(%rcx) + sub $4096,%rax + cmp $4096,%rax + jge P0 + sub %rax,%rcx + test %rax,(%rcx) + + mov %rsp,%rax + mov %rcx,%rsp + mov (%rax),%rcx /* restore ecx */ + jmp *8(%rax) + +/* ---------------------------------------------- */ +/* setjmp/longjmp support */ + +.globl _(tinyc_getbp) +_(tinyc_getbp): + mov %rbp,%rax + ret + +/* ---------------------------------------------- */ +#endif +/* ---------------------------------------------- */ + + |