Commit f8b6b367 authored by A. Wilcox's avatar A. Wilcox

Merge branch 'ppc-fix' into 'master'

internal: add a wrapper for __libc_start_main for PowerPC(64(le))

See merge request !6
parents 289a455f 19738b58
......@@ -2,6 +2,47 @@
#include <stdio.h>
#include <stdlib.h>
#if defined(__powerpc__)
/* On PowerPC as well as ppc64, we need to fix up __libc_start_main as the
* glibc and musl versions have wildly different signatures, which would
* result in the arguments to __libc_start_main being completely wrong.
*
* Using dlsym in this context is mildly questionable as this is before
* the full initialization has been done, but there is no better way.
*/
#include <dlfcn.h>
struct startup_info {
void *sda_base;
void *f_main;
void *f_init;
void *f_fini;
};
typedef int (*start_main_t)(void *mf, int argc, char **argv);
/*
* ref: https://git.musl-libc.org/cgit/musl/tree/crt/crt1.c?id=90251cf
* ref: https://git.musl-libc.org/cgit/musl/tree/src/env/__libc_start_main.c?id=90251cf#n71
* ref: https://github.com/bminor/glibc/blob/5cb226d/sysdeps/unix/sysv/linux/powerpc/libc-start.c#L36
*/
int __libc_start_main(void *argc, void *argv, void *ev, void *auxv, void *fini,
struct startup_info *si, long *p)
{
(void)argc;
(void)argv;
(void)ev;
(void)auxv;
(void)fini;
/* argc/argv from the stack, main from startup_info */
start_main_t mainf = (start_main_t)dlsym(RTLD_NEXT, "__libc_start_main");
return mainf(si->f_main, *p, (void *)(p + 1));
}
#endif /* defined(__powerpc__) */
void GCOMPAT__panic(const char *fmt, ...)
{
va_list va;
......
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