#ifdef TARGET_DEFS_ONLY #define EM_TCC_TARGET EM_X86_64 /* relocation type for 32 bit data relocation */#define R_DATA_32 R_X86_64_32S#define R_DATA_PTR R_X86_64_64#define R_JMP_SLOT R_X86_64_JUMP_SLOT#define R_GLOB_DAT R_X86_64_GLOB_DAT#define R_COPY R_X86_64_COPY#define R_RELATIVE R_X86_64_RELATIVE #define R_NUM R_X86_64_NUM #define ELF_START_ADDR 0x400000#define ELF_PAGE_SIZE 0x200000 #define PCRELATIVE_DLLPLT 1#define RELOCATE_DLLPLT 1 #else /* !TARGET_DEFS_ONLY */ #include "tcc.h" #if !defined(ELF_OBJ_ONLY) || defined(TCC_TARGET_MACHO)/* Returns 1 for a code relocation, 0 for a data relocation. For unknown relocations, returns -1. */int code_reloc (int reloc_type){ switch (reloc_type) { case R_X86_64_32: case R_X86_64_32S: case R_X86_64_64: case R_X86_64_GOTPC32: case R_X86_64_GOTPC64: case R_X86_64_GOTPCREL: case R_X86_64_GOTPCRELX: case R_X86_64_REX_GOTPCRELX: case R_X86_64_GOTTPOFF: case R_X86_64_GOT32: case R_X86_64_GOT64: case R_X86_64_GLOB_DAT: case R_X86_64_COPY: case R_X86_64_RELATIVE: case R_X86_64_GOTOFF64: case R_X86_64_TLSGD: case R_X86_64_TLSLD: case R_X86_64_DTPOFF32: case R_X86_64_TPOFF32: return 0; case R_X86_64_PC32: case R_X86_64_PC64: case R_X86_64_PLT32: case R_X86_64_PLTOFF64: case R_X86_64_JUMP_SLOT: return 1; } return -1;} /* Returns an enumerator to describe whether and when the relocation needs a GOT and/or PLT entry to be created. See tcc.h for a description of the different values. */int gotplt_entry_type (int reloc_type){ switch (reloc_type) { case R_X86_64_GLOB_DAT: case R_X86_64_JUMP_SLOT: case R_X86_64_COPY: case R_X86_64_RELATIVE: return NO_GOTPLT_ENTRY; /* The following relocs wouldn't normally need GOT or PLT slots, but we need them for simplicity in the link editor part. See our caller for comments. */ case R_X86_64_32: case R_X86_64_32S: case R_X86_64_64: case R_X86_64_PC32: case R_X86_64_PC64: return AUTO_GOTPLT_ENTRY; case R_X86_64_GOTTPOFF: return BUILD_GOT_ONLY; case R_X86_64_GOT32: case R_X86_64_GOT64: case R_X86_64_GOTPC32: case R_X86_64_GOTPC64: case R_X86_64_GOTOFF64: case R_X86_64_GOTPCREL: case R_X86_64_GOTPCRELX: case R_X86_64_TLSGD: case R_X86_64_TLSLD: case R_X86_64_DTPOFF32: case R_X86_64_TPOFF32: case R_X86_64_REX_GOTPCRELX: case R_X86_64_PLT32: case R_X86_64_PLTOFF64: return ALWAYS_GOTPLT_ENTRY; } return -1;} #if !defined(TCC_TARGET_MACHO) || defined TCC_IS_NATIVEST_FUNC unsigned create_plt_entry(TCCState *s1, unsigned got_offset, struct sym_attr *attr){ Section *plt = s1->plt; uint8_t *p; int modrm; unsigned plt_offset, relofs; modrm = 0x25; /* empty PLT: create PLT0 entry that pushes the library identifier (GOT + PTR_SIZE) and jumps to ld.so resolution routine (GOT + 2 * PTR_SIZE) */ if (plt->data_offset == 0) { p = section_ptr_add(plt, 16); p[0] = 0xff; /* pushl got + PTR_SIZE */ p[1] = modrm + 0x10; write32le(p + 2, PTR_SIZE); p[6] = 0xff; /* jmp *(got + PTR_SIZE * 2) */ p[7] = modrm; write32le(p + 8, PTR_SIZE * 2); } plt_offset = plt->data_offset; /* The PLT slot refers to the relocation entry it needs via offset. The reloc entry is created below, so its offset is the current data_offset */ relofs = s1->got->reloc ? s1->got->reloc->data_offset : 0; /* Jump to GOT entry where ld.so initially put the address of ip + 4 */ p = section_ptr_add(plt, 16); p[0] = 0xff; /* jmp *(got + x) */ p[1] = modrm; write32le(p + 2, got_offset); p[6] = 0x68; /* push $xxx */ /* On x86-64, the relocation is referred to by _index_ */ write32le(p + 7, relofs / sizeof (ElfW_Rel)); p[11] = 0xe9; /* jmp plt_start */ write32le(p + 12, -(plt->data_offset)); return plt_offset;} /* relocate the PLT: compute addresses and offsets in the PLT now that final address for PLT and GOT are known (see fill_program_header) */ST_FUNC void relocate_plt(TCCState *s1){ uint8_t *p, *p_end; if (!s1->plt) return; p = s1->plt->data; p_end = p + s1->plt->data_offset; if (p < p_end) { int x = s1->got->sh_addr - s1->plt->sh_addr - 6; add32le(p + 2, x); add32le(p + 8, x - 6); p += 16; while (p < p_end) { add32le(p + 2, x + (s1->plt->data - p)); p += 16; } }}#endif#endif void relocate(TCCState *s1, ElfW_Rel *rel, int type, unsigned 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_X86_64_64: if (s1->output_type == TCC_OUTPUT_DLL) { esym_index = get_sym_attr(s1, sym_index, 0)->dyn_index; qrel->r_offset = rel->r_offset; if (esym_index) { qrel->r_info = ELFW(R_INFO)(esym_index, R_X86_64_64); qrel->r_addend = rel->r_addend; qrel++; break; } else { qrel->r_info = ELFW(R_INFO)(0, R_X86_64_RELATIVE); qrel->r_addend = read64le(ptr) + val; qrel++; } } add64le(ptr, val); break; case R_X86_64_32: case R_X86_64_32S: if (s1->output_type == TCC_OUTPUT_DLL) { /* XXX: this logic may depend on TCC's codegen now TCC uses R_X86_64_32 even for a 64bit pointer */ qrel->r_offset = rel->r_offset; qrel->r_info = ELFW(R_INFO)(0, R_X86_64_RELATIVE); /* Use sign extension! */ qrel->r_addend = (int)read32le(ptr) + val; qrel++; } add32le(ptr, val); break; case R_X86_64_PC32: if (s1->output_type == TCC_OUTPUT_DLL) { /* DLL relocation */ esym_index = get_sym_attr(s1, sym_index, 0)->dyn_index; if (esym_index) { qrel->r_offset = rel->r_offset; qrel->r_info = ELFW(R_INFO)(esym_index, R_X86_64_PC32); /* Use sign extension! */ qrel->r_addend = (int)read32le(ptr) + rel->r_addend; qrel++; break; } } goto plt32pc32; case R_X86_64_PLT32: /* fallthrough: val already holds the PLT slot address */ plt32pc32: { long long diff; diff = (long long)val - addr; if (diff < -2147483648LL || diff > 2147483647LL) { tcc_error("internal error: relocation failed"); } add32le(ptr, diff); } break; case R_X86_64_PLTOFF64: add64le(ptr, val - s1->got->sh_addr + rel->r_addend); break; case R_X86_64_PC64: if (s1->output_type == TCC_OUTPUT_DLL) { /* DLL relocation */ esym_index = get_sym_attr(s1, sym_index, 0)->dyn_index; if (esym_index) { qrel->r_offset = rel->r_offset; qrel->r_info = ELFW(R_INFO)(esym_index, R_X86_64_PC64); qrel->r_addend = read64le(ptr) + rel->r_addend; qrel++; break; } } add64le(ptr, val - addr); break; case R_X86_64_GLOB_DAT: case R_X86_64_JUMP_SLOT: /* They don't need addend */ write64le(ptr, val - rel->r_addend); break; case R_X86_64_GOTPCREL: case R_X86_64_GOTPCRELX: case R_X86_64_REX_GOTPCRELX: add32le(ptr, s1->got->sh_addr - addr + get_sym_attr(s1, sym_index, 0)->got_offset - 4); break; case R_X86_64_GOTPC32: add32le(ptr, s1->got->sh_addr - addr + rel->r_addend); break; case R_X86_64_GOTPC64: add64le(ptr, s1->got->sh_addr - addr + rel->r_addend); break; case R_X86_64_GOTTPOFF: add32le(ptr, val - s1->got->sh_addr); break; case R_X86_64_GOT32: /* we load the got offset */ add32le(ptr, get_sym_attr(s1, sym_index, 0)->got_offset); break; case R_X86_64_GOT64: /* we load the got offset */ add64le(ptr, get_sym_attr(s1, sym_index, 0)->got_offset); break; case R_X86_64_GOTOFF64: add64le(ptr, val - s1->got->sh_addr); break; case R_X86_64_TLSGD: { static const unsigned char expect[] = { /* .byte 0x66; lea 0(%rip),%rdi */ 0x66, 0x48, 0x8d, 0x3d, 0x00, 0x00, 0x00, 0x00, /* .word 0x6666; rex64; call __tls_get_addr@PLT */ 0x66, 0x66, 0x48, 0xe8, 0x00, 0x00, 0x00, 0x00 }; static const unsigned char replace[] = { /* mov %fs:0,%rax */ 0x64, 0x48, 0x8b, 0x04, 0x25, 0x00, 0x00, 0x00, 0x00, /* lea -4(%rax),%rax */ 0x48, 0x8d, 0x80, 0x00, 0x00, 0x00, 0x00 }; if (memcmp (ptr-4, expect, sizeof(expect)) == 0) { ElfW(Sym) *sym; Section *sec; int32_t x; memcpy(ptr-4, replace, sizeof(replace)); rel[1].r_info = ELFW(R_INFO)(0, R_X86_64_NONE); sym = &((ElfW(Sym) *)symtab_section->data)[sym_index]; sec = s1->sections[sym->st_shndx]; x = sym->st_value - sec->sh_addr - sec->data_offset; add32le(ptr + 8, x); } else tcc_error("unexpected R_X86_64_TLSGD pattern"); } break; case R_X86_64_TLSLD: { static const unsigned char expect[] = { /* lea 0(%rip),%rdi */ 0x48, 0x8d, 0x3d, 0x00, 0x00, 0x00, 0x00, /* call __tls_get_addr@PLT */ 0xe8, 0x00, 0x00, 0x00, 0x00 }; static const unsigned char replace[] = { /* data16 data16 data16 mov %fs:0,%rax */ 0x66, 0x66, 0x66, 0x64, 0x48, 0x8b, 0x04, 0x25, 0x00, 0x00, 0x00, 0x00 }; if (memcmp (ptr-3, expect, sizeof(expect)) == 0) { memcpy(ptr-3, replace, sizeof(replace)); rel[1].r_info = ELFW(R_INFO)(0, R_X86_64_NONE); } else tcc_error("unexpected R_X86_64_TLSLD pattern"); } break; case R_X86_64_DTPOFF32: case R_X86_64_TPOFF32: { ElfW(Sym) *sym; Section *sec; int32_t x; sym = &((ElfW(Sym) *)symtab_section->data)[sym_index]; sec = s1->sections[sym->st_shndx]; x = val - sec->sh_addr - sec->data_offset; add32le(ptr, x); } break; case R_X86_64_NONE: break; case R_X86_64_RELATIVE:#ifdef TCC_TARGET_PE add32le(ptr, val - s1->pe_imagebase);#endif /* do nothing */ break; }} #endif /* !TARGET_DEFS_ONLY */
#ifdef TARGET_DEFS_ONLY
#define EM_TCC_TARGET EM_X86_64
/* relocation type for 32 bit data relocation */
#define R_DATA_32 R_X86_64_32S
#define R_DATA_PTR R_X86_64_64
#define R_JMP_SLOT R_X86_64_JUMP_SLOT
#define R_GLOB_DAT R_X86_64_GLOB_DAT
#define R_COPY R_X86_64_COPY
#define R_RELATIVE R_X86_64_RELATIVE
#define R_NUM R_X86_64_NUM
#define ELF_START_ADDR 0x400000
#define ELF_PAGE_SIZE 0x200000
#define PCRELATIVE_DLLPLT 1
#define RELOCATE_DLLPLT 1
#else /* !TARGET_DEFS_ONLY */
#include "tcc.h"
#if !defined(ELF_OBJ_ONLY) || defined(TCC_TARGET_MACHO)
/* Returns 1 for a code relocation, 0 for a data relocation. For unknown
relocations, returns -1. */
int code_reloc (int reloc_type)
{
switch (reloc_type) {
case R_X86_64_32:
case R_X86_64_32S:
case R_X86_64_64:
case R_X86_64_GOTPC32:
case R_X86_64_GOTPC64:
case R_X86_64_GOTPCREL:
case R_X86_64_GOTPCRELX:
case R_X86_64_REX_GOTPCRELX:
case R_X86_64_GOTTPOFF:
case R_X86_64_GOT32:
case R_X86_64_GOT64:
case R_X86_64_GLOB_DAT:
case R_X86_64_COPY:
case R_X86_64_RELATIVE:
case R_X86_64_GOTOFF64:
case R_X86_64_TLSGD:
case R_X86_64_TLSLD:
case R_X86_64_DTPOFF32:
case R_X86_64_TPOFF32:
return 0;
case R_X86_64_PC32:
case R_X86_64_PC64:
case R_X86_64_PLT32:
case R_X86_64_PLTOFF64:
case R_X86_64_JUMP_SLOT:
return 1;
}
return -1;
}
/* Returns an enumerator to describe whether and when the relocation needs a
GOT and/or PLT entry to be created. See tcc.h for a description of the
different values. */
int gotplt_entry_type (int reloc_type)
{
switch (reloc_type) {
case R_X86_64_GLOB_DAT:
case R_X86_64_JUMP_SLOT:
case R_X86_64_COPY:
case R_X86_64_RELATIVE:
return NO_GOTPLT_ENTRY;
/* The following relocs wouldn't normally need GOT or PLT
slots, but we need them for simplicity in the link
editor part. See our caller for comments. */
case R_X86_64_32:
case R_X86_64_32S:
case R_X86_64_64:
case R_X86_64_PC32:
case R_X86_64_PC64:
return AUTO_GOTPLT_ENTRY;
case R_X86_64_GOTTPOFF:
return BUILD_GOT_ONLY;
case R_X86_64_GOT32:
case R_X86_64_GOT64:
case R_X86_64_GOTPC32:
case R_X86_64_GOTPC64:
case R_X86_64_GOTOFF64:
case R_X86_64_GOTPCREL:
case R_X86_64_GOTPCRELX:
case R_X86_64_TLSGD:
case R_X86_64_TLSLD:
case R_X86_64_DTPOFF32:
case R_X86_64_TPOFF32:
case R_X86_64_REX_GOTPCRELX:
case R_X86_64_PLT32:
case R_X86_64_PLTOFF64:
return ALWAYS_GOTPLT_ENTRY;
}
return -1;
}
#if !defined(TCC_TARGET_MACHO) || defined TCC_IS_NATIVE
ST_FUNC unsigned create_plt_entry(TCCState *s1, unsigned got_offset, struct sym_attr *attr)
{
Section *plt = s1->plt;
uint8_t *p;
int modrm;
unsigned plt_offset, relofs;
modrm = 0x25;
/* empty PLT: create PLT0 entry that pushes the library identifier
(GOT + PTR_SIZE) and jumps to ld.so resolution routine
(GOT + 2 * PTR_SIZE) */
if (plt->data_offset == 0) {
p = section_ptr_add(plt, 16);
p[0] = 0xff; /* pushl got + PTR_SIZE */
p[1] = modrm + 0x10;
write32le(p + 2, PTR_SIZE);
p[6] = 0xff; /* jmp *(got + PTR_SIZE * 2) */
p[7] = modrm;
write32le(p + 8, PTR_SIZE * 2);
}
plt_offset = plt->data_offset;
/* The PLT slot refers to the relocation entry it needs via offset.
The reloc entry is created below, so its offset is the current
data_offset */
relofs = s1->got->reloc ? s1->got->reloc->data_offset : 0;
/* Jump to GOT entry where ld.so initially put the address of ip + 4 */
p = section_ptr_add(plt, 16);
p[0] = 0xff; /* jmp *(got + x) */
p[1] = modrm;
write32le(p + 2, got_offset);
p[6] = 0x68; /* push $xxx */
/* On x86-64, the relocation is referred to by _index_ */
write32le(p + 7, relofs / sizeof (ElfW_Rel));
p[11] = 0xe9; /* jmp plt_start */
write32le(p + 12, -(plt->data_offset));
return plt_offset;
}
/* relocate the PLT: compute addresses and offsets in the PLT now that final
address for PLT and GOT are known (see fill_program_header) */
ST_FUNC void relocate_plt(TCCState *s1)
{
uint8_t *p, *p_end;
if (!s1->plt)
return;
p = s1->plt->data;
p_end = p + s1->plt->data_offset;
if (p < p_end) {
int x = s1->got->sh_addr - s1->plt->sh_addr - 6;
add32le(p + 2, x);
add32le(p + 8, x - 6);
p += 16;
while (p < p_end) {
add32le(p + 2, x + (s1->plt->data - p));
p += 16;
}
}
}
#endif
#endif
void relocate(TCCState *s1, ElfW_Rel *rel, int type, unsigned 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_X86_64_64:
if (s1->output_type == TCC_OUTPUT_DLL) {
esym_index = get_sym_attr(s1, sym_index, 0)->dyn_index;
qrel->r_offset = rel->r_offset;
if (esym_index) {
qrel->r_info = ELFW(R_INFO)(esym_index, R_X86_64_64);
qrel->r_addend = rel->r_addend;
qrel++;
break;
} else {
qrel->r_info = ELFW(R_INFO)(0, R_X86_64_RELATIVE);
qrel->r_addend = read64le(ptr) + val;
qrel++;
}
}
add64le(ptr, val);
break;
case R_X86_64_32:
case R_X86_64_32S:
if (s1->output_type == TCC_OUTPUT_DLL) {
/* XXX: this logic may depend on TCC's codegen
now TCC uses R_X86_64_32 even for a 64bit pointer */
qrel->r_offset = rel->r_offset;
qrel->r_info = ELFW(R_INFO)(0, R_X86_64_RELATIVE);
/* Use sign extension! */
qrel->r_addend = (int)read32le(ptr) + val;
qrel++;
}
add32le(ptr, val);
break;
case R_X86_64_PC32:
if (s1->output_type == TCC_OUTPUT_DLL) {
/* DLL relocation */
esym_index = get_sym_attr(s1, sym_index, 0)->dyn_index;
if (esym_index) {
qrel->r_offset = rel->r_offset;
qrel->r_info = ELFW(R_INFO)(esym_index, R_X86_64_PC32);
/* Use sign extension! */
qrel->r_addend = (int)read32le(ptr) + rel->r_addend;
qrel++;
break;
}
}
goto plt32pc32;
case R_X86_64_PLT32:
/* fallthrough: val already holds the PLT slot address */
plt32pc32:
{
long long diff;
diff = (long long)val - addr;
if (diff < -2147483648LL || diff > 2147483647LL) {
tcc_error("internal error: relocation failed");
}
add32le(ptr, diff);
}
break;
case R_X86_64_PLTOFF64:
add64le(ptr, val - s1->got->sh_addr + rel->r_addend);
break;
case R_X86_64_PC64:
if (s1->output_type == TCC_OUTPUT_DLL) {
/* DLL relocation */
esym_index = get_sym_attr(s1, sym_index, 0)->dyn_index;
if (esym_index) {
qrel->r_offset = rel->r_offset;
qrel->r_info = ELFW(R_INFO)(esym_index, R_X86_64_PC64);
qrel->r_addend = read64le(ptr) + rel->r_addend;
qrel++;
break;
}
}
add64le(ptr, val - addr);
break;
case R_X86_64_GLOB_DAT:
case R_X86_64_JUMP_SLOT:
/* They don't need addend */
write64le(ptr, val - rel->r_addend);
break;
case R_X86_64_GOTPCREL:
case R_X86_64_GOTPCRELX:
case R_X86_64_REX_GOTPCRELX:
add32le(ptr, s1->got->sh_addr - addr +
get_sym_attr(s1, sym_index, 0)->got_offset - 4);
break;
case R_X86_64_GOTPC32:
add32le(ptr, s1->got->sh_addr - addr + rel->r_addend);
break;
case R_X86_64_GOTPC64:
add64le(ptr, s1->got->sh_addr - addr + rel->r_addend);
break;
case R_X86_64_GOTTPOFF:
add32le(ptr, val - s1->got->sh_addr);
break;
case R_X86_64_GOT32:
/* we load the got offset */
add32le(ptr, get_sym_attr(s1, sym_index, 0)->got_offset);
break;
case R_X86_64_GOT64:
/* we load the got offset */
add64le(ptr, get_sym_attr(s1, sym_index, 0)->got_offset);
break;
case R_X86_64_GOTOFF64:
add64le(ptr, val - s1->got->sh_addr);
break;
case R_X86_64_TLSGD:
{
static const unsigned char expect[] = {
/* .byte 0x66; lea 0(%rip),%rdi */
0x66, 0x48, 0x8d, 0x3d, 0x00, 0x00, 0x00, 0x00,
/* .word 0x6666; rex64; call __tls_get_addr@PLT */
0x66, 0x66, 0x48, 0xe8, 0x00, 0x00, 0x00, 0x00 };
static const unsigned char replace[] = {
/* mov %fs:0,%rax */
0x64, 0x48, 0x8b, 0x04, 0x25, 0x00, 0x00, 0x00, 0x00,
/* lea -4(%rax),%rax */
0x48, 0x8d, 0x80, 0x00, 0x00, 0x00, 0x00 };
if (memcmp (ptr-4, expect, sizeof(expect)) == 0) {
ElfW(Sym) *sym;
Section *sec;
int32_t x;
memcpy(ptr-4, replace, sizeof(replace));
rel[1].r_info = ELFW(R_INFO)(0, R_X86_64_NONE);
sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
sec = s1->sections[sym->st_shndx];
x = sym->st_value - sec->sh_addr - sec->data_offset;
add32le(ptr + 8, x);
}
else
tcc_error("unexpected R_X86_64_TLSGD pattern");
}
break;
case R_X86_64_TLSLD:
{
static const unsigned char expect[] = {
/* lea 0(%rip),%rdi */
0x48, 0x8d, 0x3d, 0x00, 0x00, 0x00, 0x00,
/* call __tls_get_addr@PLT */
0xe8, 0x00, 0x00, 0x00, 0x00 };
static const unsigned char replace[] = {
/* data16 data16 data16 mov %fs:0,%rax */
0x66, 0x66, 0x66, 0x64, 0x48, 0x8b, 0x04, 0x25,
0x00, 0x00, 0x00, 0x00 };
if (memcmp (ptr-3, expect, sizeof(expect)) == 0) {
memcpy(ptr-3, replace, sizeof(replace));
rel[1].r_info = ELFW(R_INFO)(0, R_X86_64_NONE);
}
else
tcc_error("unexpected R_X86_64_TLSLD pattern");
}
break;
case R_X86_64_DTPOFF32:
case R_X86_64_TPOFF32:
{
ElfW(Sym) *sym;
Section *sec;
int32_t x;
sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
sec = s1->sections[sym->st_shndx];
x = val - sec->sh_addr - sec->data_offset;
add32le(ptr, x);
}
break;
case R_X86_64_NONE:
break;
case R_X86_64_RELATIVE:
#ifdef TCC_TARGET_PE
add32le(ptr, val - s1->pe_imagebase);
#endif
/* do nothing */
break;
}
}
#endif /* !TARGET_DEFS_ONLY */