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mescc: Tinycc support: refactor _start. 

* mlibc/libc-mes.c (_start): Refactor.
  (_env): Remove.
* stage0/x86.M1:
This commit is contained in:
Jan Nieuwenhuizen 2017-09-03 08:18:18 +02:00
parent 9aa8d8bd9d
commit 29acdfa2a7
2 changed files with 21 additions and 26 deletions
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46
mlibc/libc-mes.c
View File

@ -23,42 +23,36 @@
int g_stdin = 0;
char **g_environment;
int _env ();
int exit ();
int main(int,char*[]);
int main (int,char*[]);
int
_start ()
{
asm ("mov____%ebp,%eax"); // mov %ebp,%eax
asm ("add____$i8,%eax !8"); // add $0x8,%eax
asm ("push___%eax"); // push %eax
asm ("mov____%ebp,%eax");
asm ("add____$i8,%eax !4");
asm ("mov____%ebp,%eax"); // mov %ebp,%eax
asm ("add____$i8,%eax !4"); // add $0x4,%eax
asm ("movzbl_(%eax),%eax"); // movzbl (%eax),%eax
asm ("push___%eax"); // push %eax
asm ("movzbl_(%eax),%eax");
asm ("add____$i8,%eax !3");
asm ("mov____%ebp,%eax"); // mov %ebp,%eax
asm ("add____$i8,%eax !4"); // add $0x4,%eax
asm ("shl____$i8,%eax !0x02");
asm ("add____%ebp,%eax");
asm ("mov____%eax,0x32 &g_environment");
asm ("movzbl_(%eax),%eax"); // movzbl (%eax),%eax
asm ("add____$i8,%eax !3"); // add $0x3,%eax
asm ("mov____%ebp,%eax");
asm ("add____$i8,%eax !8");
asm ("push___%eax");
asm ("shl____$i8,%eax !0x02"); // shl $0x2,%eax
asm ("add____%ebp,%eax"); // add %ebp,%eax
asm ("push___%eax"); // push %eax
asm ("mov____%ebp,%eax");
asm ("add____$i8,%eax !4");
asm ("movzbl_(%eax),%eax");
asm ("push___%eax");
g_environment = _env ();
asm ("pop____%eax"); // pop %eax
int r = main ();
exit (r);
}
main ();
char **
_env (char **e)
{
return e;
asm ("mov____%eax,%ebx");
asm ("mov____$i32,%eax %1");
asm ("int____$0x80");
asm ("hlt");
}
void

1
stage0/x86.M1
View File

@ -49,6 +49,7 @@ DEFINE cmp____$i8,0x32(%ebp) 83bd
DEFINE cmp____$i8,0x8(%ebp) 837d
DEFINE cmp____%al,%dl 38c2
DEFINE cmp____%edx,%eax 39d0
DEFINE hlt f4
DEFINE idiv___%ebx f7fb
DEFINE int____$0x80 cd80
DEFINE je32 0f84