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Retro68
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This commit is contained in:
Wolfgang Thaller 2012-04-06 00:46:05 +02:00
parent c5e8e4700c
commit 4f6bed514d
1 changed files with 54 additions and 54 deletions
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108
libretro/start.c
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@ -40,58 +40,58 @@ extern void __fini_section_end(void);
void _start()
{
char *argv[2] = { "./a.out", NULL };
long virtualstart, realstart;
__asm__( "move.l #_start, %0" : "=r"(virtualstart) );
__asm__( "lea (_start:w,%%pc), %0" : "=a"(realstart) );
long displacement = realstart - virtualstart;
struct flat_hdr *header = (struct flat_hdr*) (displacement - 0x40);
Ptr bss = NewPtrClear(header->bss_end - header->data_end);
long n = header->reloc_count;
long *relocs = (long*)( (char*)header + header->reloc_start );
long i;
long data_end = header->data_end - 0x40;
long bss_displacement = (long)bss - data_end;
for(i = 0; i < n; i++)
{
uint8_t *addrPtr = (uint8_t*)(relocs[i] + displacement);
long addr;
addr = (addrPtr[0] << 24) | (addrPtr[1] << 16) | (addrPtr[2] << 8) | addrPtr[3];
addr += addr >= data_end ? bss_displacement : displacement;
addrPtr[0] = addr >> 24;
addrPtr[1] = addr >> 16;
addrPtr[2] = addr >> 8;
addrPtr[3] = addr;
}
/* {
voidFunction *p;
for(p = __init_array_start; p < __init_array_end; ++p)
(**p)();
}*/
//__init_section();
{
char *p = (char*)&__init_section;
char *e = (char*)&__init_section_end;
p += 2;
while( p < e )
{
(*(voidFunction)(*(long*)p))();
p += 6;
}
}
main(displacement, argv);
ExitToShell();
char *argv[2] = { "./a.out", NULL };
long virtualstart, realstart;
__asm__( "move.l #_start, %0" : "=r"(virtualstart) );
__asm__( "lea (_start:w,%%pc), %0" : "=a"(realstart) );
long displacement = realstart - virtualstart;
struct flat_hdr *header = (struct flat_hdr*) (displacement - 0x40);
Ptr bss = NewPtrClear(header->bss_end - header->data_end);
long n = header->reloc_count;
long *relocs = (long*)( (char*)header + header->reloc_start );
long i;
long data_end = header->data_end - 0x40;
long bss_displacement = (long)bss - data_end;
for(i = 0; i < n; i++)
{
uint8_t *addrPtr = (uint8_t*)(relocs[i] + displacement);
long addr;
addr = (addrPtr[0] << 24) | (addrPtr[1] << 16) | (addrPtr[2] << 8) | addrPtr[3];
addr += addr >= data_end ? bss_displacement : displacement;
addrPtr[0] = addr >> 24;
addrPtr[1] = addr >> 16;
addrPtr[2] = addr >> 8;
addrPtr[3] = addr;
}
/* {
voidFunction *p;
for(p = __init_array_start; p < __init_array_end; ++p)
(**p)();
}*/
//__init_section();
{
char *p = (char*)&__init_section;
char *e = (char*)&__init_section_end;
p += 2;
while( p < e )
{
(*(voidFunction)(*(long*)p))();
p += 6;
}
}
main(displacement, argv);
ExitToShell();
}