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Add support of Thumb to ARM branch relocation

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This commit is contained in:
Thomas Preud'homme 2014-02-02 17:15:19 +08:00
parent b5b82df3e3
commit 8635939b8d
1 changed files with 28 additions and 0 deletions
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28
tccelf.c
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@ -1188,6 +1188,34 @@ ST_FUNC void build_got_entries(TCCState *s1)
sym_index);
}
break;
case R_ARM_THM_JUMP24:
sym_index = ELFW(R_SYM)(rel->r_info);
sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
/* We are relocating a jump from thumb code to arm code */
if (sym->st_shndx != SHN_UNDEF && !(sym->st_value & 1)) {
int index;
uint8_t *p;
char *name, buf[1024];
Section *text_section;
name = symtab_section->link->data + sym->st_name;
text_section = s1->sections[sym->st_shndx];
/* Modify reloc to target a thumb stub to switch to ARM */
snprintf(buf, sizeof(buf), "%s_from_thumb", name);
index = put_elf_sym(symtab_section,
text_section->data_offset + 1,
sym->st_size, sym->st_info, 0,
sym->st_shndx, buf);
rel->r_info = ELFW(R_INFO)(index, type);
/* Create a thumb stub fonction to switch to ARM mode */
put_elf_reloc(symtab_section, text_section,
text_section->data_offset, R_ARM_JUMP24,
sym_index);
p = section_ptr_add(text_section, 8);
put32(p, 0x4778); /* bx pc */
put32(p+2, 0x46c0); /* nop */
put32(p+4, 0xeafffffe); /* b $sym */
}
#elif defined(TCC_TARGET_C67)
case R_C60_GOT32:
case R_C60_GOTOFF: