mirror of
https://github.com/autc04/Retro68.git
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87 lines
2.4 KiB
C
87 lines
2.4 KiB
C
#include <Processes.h>
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#include <Sound.h>
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#include <Memory.h>
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int main(int argc, char* argv[]);
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struct flat_hdr {
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char magic[4];
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unsigned long rev; /* version */
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unsigned long entry; /* Offset of first executable instruction
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with text segment from beginning of file */
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unsigned long data_start; /* Offset of data segment from beginning of
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file */
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unsigned long data_end; /* Offset of end of data segment
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from beginning of file */
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unsigned long bss_end; /* Offset of end of bss segment from beginning
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of file */
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/* (It is assumed that data_end through bss_end forms the bss segment.) */
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unsigned long stack_size; /* Size of stack, in bytes */
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unsigned long reloc_start; /* Offset of relocation records from
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beginning of file */
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unsigned long reloc_count; /* Number of relocation records */
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unsigned long flags;
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unsigned long filler[6]; /* Reserved, set to zero */
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};
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typedef void (*voidFunction)(void);
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//extern voidFunction __init_array_start[];
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//extern voidFunction __init_array_end[];
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extern void __init_section(void);
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extern void __init_section_end(void);
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extern void __fini_section(void);
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extern void __fini_section_end(void);
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void _start()
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{
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char *argv[2] = { "./a.out", NULL };
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long virtualstart, realstart;
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__asm__( "move.l #_start, %0" : "=r"(virtualstart) );
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__asm__( "lea (_start:w,%%pc), %0" : "=a"(realstart) );
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long displacement = realstart - virtualstart;
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struct flat_hdr *header = (struct flat_hdr*) (displacement - 0x40);
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Ptr bss = NewPtrClear(header->bss_end - header->data_end);
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long n = header->reloc_count;
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long *relocs = (long*)( (char*)header + header->reloc_start );
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long i;
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long data_end = header->data_end - 0x40;
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long bss_displacement = (long)bss - data_end;
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for(i = 0; i < n; i++)
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{
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long *addr = (long*)(relocs[i] + displacement);
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*addr += (*addr >= data_end ? bss_displacement : displacement);
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}
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/* {
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voidFunction *p;
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for(p = __init_array_start; p < __init_array_end; ++p)
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(**p)();
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}*/
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//__init_section();
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{
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char *p = (char*)&__init_section;
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char *e = (char*)&__init_section_end;
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p += 2;
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while( p < e )
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{
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(*(voidFunction)(*(long*)p))();
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p += 6;
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}
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}
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main(displacement, argv);
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ExitToShell();
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}
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