My fork of the Tiny C Compiler, designed to support self-modifying and hot-reloading applications
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#ifdef TARGET_DEFS_ONLY
#define EM_TCC_TARGET EM_386
/* relocation type for 32 bit data relocation */
#define R_DATA_32 R_386_32
#define R_DATA_PTR R_386_32
#define R_JMP_SLOT R_386_JMP_SLOT
#define R_GLOB_DAT R_386_GLOB_DAT
#define R_COPY R_386_COPY
#define R_NUM R_386_NUM
#define ELF_START_ADDR 0x08048000
#define ELF_PAGE_SIZE 0x1000
#define HAVE_SECTION_RELOC
#define PCRELATIVE_DLLPLT 0
#else /* !TARGET_DEFS_ONLY */
#include "tcc.h"
static ElfW_Rel *qrel; /* ptr to next reloc entry reused */
ST_DATA struct reloc_info relocs_info[R_NUM] = {
INIT_RELOC_INFO (R_386_32, 0, NO_GOTPLT_ENTRY)
INIT_RELOC_INFO (R_386_PC32, 1, AUTO_GOTPLT_ENTRY)
INIT_RELOC_INFO (R_386_PLT32, 1, ALWAYS_GOTPLT_ENTRY)
INIT_RELOC_INFO (R_386_GLOB_DAT, 0, NO_GOTPLT_ENTRY)
INIT_RELOC_INFO (R_386_JMP_SLOT, 1, NO_GOTPLT_ENTRY)
INIT_RELOC_INFO (R_386_GOTPC, 0, BUILD_GOT_ONLY)
INIT_RELOC_INFO (R_386_GOTOFF, 0, BUILD_GOT_ONLY)
INIT_RELOC_INFO (R_386_GOT32, 0, ALWAYS_GOTPLT_ENTRY)
INIT_RELOC_INFO (R_386_GOT32X, 0, ALWAYS_GOTPLT_ENTRY)
INIT_RELOC_INFO (R_386_16, 0, NO_GOTPLT_ENTRY)
INIT_RELOC_INFO (R_386_PC16, 1, AUTO_GOTPLT_ENTRY)
};
void relocate_init(Section *sr)
{
qrel = (ElfW_Rel *) sr->data;
}
void relocate(TCCState *s1, ElfW_Rel *rel, int type, char *ptr, addr_t addr, addr_t val)
{
int sym_index, esym_index;
sym_index = ELFW(R_SYM)(rel->r_info);
switch (type) {
case R_386_32:
if (s1->output_type == TCC_OUTPUT_DLL) {
esym_index = s1->symtab_to_dynsym[sym_index];
qrel->r_offset = rel->r_offset;
if (esym_index) {
qrel->r_info = ELFW(R_INFO)(esym_index, R_386_32);
qrel++;
return;
} else {
qrel->r_info = ELFW(R_INFO)(0, R_386_RELATIVE);
qrel++;
}
}
add32le(ptr, val);
return;
case R_386_PC32:
if (s1->output_type == TCC_OUTPUT_DLL) {
/* DLL relocation */
esym_index = s1->symtab_to_dynsym[sym_index];
if (esym_index) {
qrel->r_offset = rel->r_offset;
qrel->r_info = ELFW(R_INFO)(esym_index, R_386_PC32);
qrel++;
return;
}
}
add32le(ptr, val - addr);
return;
case R_386_PLT32:
add32le(ptr, val - addr);
return;
case R_386_GLOB_DAT:
case R_386_JMP_SLOT:
write32le(ptr, val);
return;
case R_386_GOTPC:
add32le(ptr, s1->got->sh_addr - addr);
return;
case R_386_GOTOFF:
add32le(ptr, val - s1->got->sh_addr);
return;
case R_386_GOT32:
case R_386_GOT32X:
/* we load the got offset */
add32le(ptr, s1->sym_attrs[sym_index].got_offset);
return;
case R_386_16:
if (s1->output_format != TCC_OUTPUT_FORMAT_BINARY) {
output_file:
tcc_error("can only produce 16-bit binary files");
}
write16le(ptr, read16le(ptr) + val);
return;
case R_386_PC16:
if (s1->output_format != TCC_OUTPUT_FORMAT_BINARY)
goto output_file;
write16le(ptr, read16le(ptr) + val - addr);
return;
case R_386_RELATIVE:
/* do nothing */
return;
case R_386_COPY:
/* This reloction must copy initialized data from the library
to the program .bss segment. Currently made like for ARM
(to remove noise of defaukt case). Is this true?
*/
return;
default:
fprintf(stderr,"FIXME: handle reloc type %d at %x [%p] to %x\n",
type, (unsigned)addr, ptr, (unsigned)val);
return;
}
}
#endif /* !TARGET_DEFS_ONLY */