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Environ pages init

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This commit is contained in:
Mark 2020-07-20 17:08:35 +03:00
parent eba58a1d21
commit eb1d52be66
1 changed files with 5 additions and 2 deletions
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7
crt/crt0.c
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@ -9,15 +9,18 @@
extern int main(int argc, char **argv);
extern char **environ;
extern uintptr_t __libc_orig_argp_base;
extern size_t __libc_orig_argp_count;
void _start(void *_arg) {
uintptr_t arg = (uintptr_t) _arg;
// arg: argp page number << 24 | 12 bit page count << 12 | 12 bit argc
char **argp = (char **) ((arg >> 12) & ~0xFFF);
int argc = arg & 0xFFF;
//__libc_vecp_pages = (arg >> 12) & 0xFFF;
// TODO: better handling for this
__libc_orig_argp_count = (arg >> 12) & 0xFFF;
__libc_orig_argp_base = (uintptr_t) argp;
environ = &argp[argc + 1];
__libc_signal_init();