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tccmacho.c
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tccmacho.c
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/*
* Mach-O file handling for TCC
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "tcc.h"
/* In order to make life easy for us we are generating Mach-O files which
don't make use of some modern features, but which aren't entirely classic
either in that they do use some modern features. We're also only
generating 64bit Mach-O files, and only native endian at that.
In particular we're generating executables that don't make use of
DYLD_INFO for dynamic linking info, as that requires us building a
trie of exported names. We're simply using classic symbol tables which
are still supported by modern dyld.
But we do use LC_MAIN, which is a "modern" feature in order to not have
to setup our own crt code. We're not using lazy linking, so even function
calls are resolved at startup. */
#if !defined TCC_TARGET_X86_64 && !defined TCC_TARGET_ARM64
#error Platform not supported
#endif
/* XXX: this file uses tcc_error() to the effect of exit(1) */
#undef _tcc_error
#define DEBUG_MACHO 0
#define dprintf if (DEBUG_MACHO) printf
#define MH_EXECUTE (0x2)
#define MH_DYLDLINK (0x4)
#define MH_DYLIB (0x6)
#define MH_PIE (0x200000)
#define CPU_SUBTYPE_LIB64 (0x80000000)
#define CPU_SUBTYPE_X86_ALL (3)
#define CPU_SUBTYPE_ARM64_ALL (0)
#define CPU_ARCH_ABI64 (0x01000000)
#define CPU_TYPE_X86 (7)
#define CPU_TYPE_X86_64 (CPU_TYPE_X86 | CPU_ARCH_ABI64)
#define CPU_TYPE_ARM (12)
#define CPU_TYPE_ARM64 (CPU_TYPE_ARM | CPU_ARCH_ABI64)
struct fat_header {
uint32_t magic; /* FAT_MAGIC or FAT_MAGIC_64 */
uint32_t nfat_arch; /* number of structs that follow */
};
struct fat_arch {
int cputype; /* cpu specifier (int) */
int cpusubtype; /* machine specifier (int) */
uint32_t offset; /* file offset to this object file */
uint32_t size; /* size of this object file */
uint32_t align; /* alignment as a power of 2 */
};
#define FAT_MAGIC 0xcafebabe
#define FAT_CIGAM 0xbebafeca
#define FAT_MAGIC_64 0xcafebabf
#define FAT_CIGAM_64 0xbfbafeca
struct mach_header {
uint32_t magic; /* mach magic number identifier */
int cputype; /* cpu specifier */
int cpusubtype; /* machine specifier */
uint32_t filetype; /* type of file */
uint32_t ncmds; /* number of load commands */
uint32_t sizeofcmds; /* the size of all the load commands */
uint32_t flags; /* flags */
};
struct mach_header_64 {
struct mach_header mh;
uint32_t reserved; /* reserved, pad to 64bit */
};
/* Constant for the magic field of the mach_header (32-bit architectures) */
#define MH_MAGIC 0xfeedface /* the mach magic number */
#define MH_CIGAM 0xcefaedfe /* NXSwapInt(MH_MAGIC) */
#define MH_MAGIC_64 0xfeedfacf /* the 64-bit mach magic number */
#define MH_CIGAM_64 0xcffaedfe /* NXSwapInt(MH_MAGIC_64) */
struct load_command {
uint32_t cmd; /* type of load command */
uint32_t cmdsize; /* total size of command in bytes */
};
#define LC_REQ_DYLD 0x80000000
#define LC_SYMTAB 0x2
#define LC_DYSYMTAB 0xb
#define LC_LOAD_DYLIB 0xc
#define LC_ID_DYLIB 0xd
#define LC_LOAD_DYLINKER 0xe
#define LC_SEGMENT_64 0x19
#define LC_RPATH (0x1c | LC_REQ_DYLD)
#define LC_REEXPORT_DYLIB (0x1f | LC_REQ_DYLD)
#define LC_DYLD_INFO_ONLY (0x22|LC_REQ_DYLD)
#define LC_MAIN (0x28|LC_REQ_DYLD)
#define LC_SOURCE_VERSION 0x2A
#define LC_BUILD_VERSION 0x32
#define LC_DYLD_EXPORTS_TRIE (0x33 | LC_REQ_DYLD)
#define LC_DYLD_CHAINED_FIXUPS (0x34 | LC_REQ_DYLD)
#define SG_READ_ONLY 0x10 /* This segment is made read-only after fixups */
typedef int vm_prot_t;
struct segment_command_64 { /* for 64-bit architectures */
uint32_t cmd; /* LC_SEGMENT_64 */
uint32_t cmdsize; /* includes sizeof section_64 structs */
char segname[16]; /* segment name */
uint64_t vmaddr; /* memory address of this segment */
uint64_t vmsize; /* memory size of this segment */
uint64_t fileoff; /* file offset of this segment */
uint64_t filesize; /* amount to map from the file */
vm_prot_t maxprot; /* maximum VM protection */
vm_prot_t initprot; /* initial VM protection */
uint32_t nsects; /* number of sections in segment */
uint32_t flags; /* flags */
};
struct section_64 { /* for 64-bit architectures */
char sectname[16]; /* name of this section */
char segname[16]; /* segment this section goes in */
uint64_t addr; /* memory address of this section */
uint64_t size; /* size in bytes of this section */
uint32_t offset; /* file offset of this section */
uint32_t align; /* section alignment (power of 2) */
uint32_t reloff; /* file offset of relocation entries */
uint32_t nreloc; /* number of relocation entries */
uint32_t flags; /* flags (section type and attributes)*/
uint32_t reserved1; /* reserved (for offset or index) */
uint32_t reserved2; /* reserved (for count or sizeof) */
uint32_t reserved3; /* reserved */
};
enum {
DYLD_CHAINED_IMPORT = 1,
};
struct dyld_chained_fixups_header {
uint32_t fixups_version; ///< 0
uint32_t starts_offset; ///< Offset of dyld_chained_starts_in_image.
uint32_t imports_offset; ///< Offset of imports table in chain_data.
uint32_t symbols_offset; ///< Offset of symbol strings in chain_data.
uint32_t imports_count; ///< Number of imported symbol names.
uint32_t imports_format; ///< DYLD_CHAINED_IMPORT*
uint32_t symbols_format; ///< 0 => uncompressed, 1 => zlib compressed
};
struct dyld_chained_starts_in_image
{
uint32_t seg_count;
uint32_t seg_info_offset[1]; // each entry is offset into this struct for that segment
// followed by pool of dyld_chain_starts_in_segment data
};
enum {
DYLD_CHAINED_PTR_64 = 2, // target is vmaddr
DYLD_CHAINED_PTR_64_OFFSET = 6, // target is vm offset
};
enum {
DYLD_CHAINED_PTR_START_NONE = 0xFFFF, // used in page_start[] to denote a page with no fixups
};
#define SEG_PAGE_SIZE 16384
struct dyld_chained_starts_in_segment
{
uint32_t size; // size of this (amount kernel needs to copy)
uint16_t page_size; // 0x1000 or 0x4000
uint16_t pointer_format; // DYLD_CHAINED_PTR_*
uint64_t segment_offset; // offset in memory to start of segment
uint32_t max_valid_pointer; // for 32-bit OS, any value beyond this is not a pointer
uint16_t page_count; // how many pages are in array
uint16_t page_start[1]; // each entry is offset in each page of first element in chain
// or DYLD_CHAINED_PTR_START_NONE if no fixups on page
};
enum BindSpecialDylib {
BIND_SPECIAL_DYLIB_FLAT_LOOKUP = -2,
};
struct dyld_chained_import
{
uint32_t lib_ordinal : 8,
weak_import : 1,
name_offset : 23;
};
struct dyld_chained_ptr_64_rebase
{
uint64_t target : 36, // vmaddr, 64GB max image size
high8 : 8, // top 8 bits set to this after slide added
reserved : 7, // all zeros
next : 12, // 4-byte stride
bind : 1; // == 0
};
struct dyld_chained_ptr_64_bind
{
uint64_t ordinal : 24,
addend : 8, // 0 thru 255
reserved : 19, // all zeros
next : 12, // 4-byte stride
bind : 1; // == 1
};
#define S_REGULAR 0x0
#define S_ZEROFILL 0x1
#define S_NON_LAZY_SYMBOL_POINTERS 0x6
#define S_LAZY_SYMBOL_POINTERS 0x7
#define S_SYMBOL_STUBS 0x8
#define S_MOD_INIT_FUNC_POINTERS 0x9
#define S_MOD_TERM_FUNC_POINTERS 0xa
#define S_ATTR_PURE_INSTRUCTIONS 0x80000000
#define S_ATTR_SOME_INSTRUCTIONS 0x00000400
#define S_ATTR_DEBUG 0x02000000
typedef uint32_t lc_str;
struct dylib_command {
uint32_t cmd; /* LC_ID_DYLIB, LC_LOAD_{,WEAK_}DYLIB,
LC_REEXPORT_DYLIB */
uint32_t cmdsize; /* includes pathname string */
lc_str name; /* library's path name */
uint32_t timestamp; /* library's build time stamp */
uint32_t current_version; /* library's current version number */
uint32_t compatibility_version; /* library's compatibility vers number*/
};
struct rpath_command {
uint32_t cmd; /* LC_RPATH */
uint32_t cmdsize; /* includes string */
lc_str path; /* path to add to run path */
};
struct dylinker_command {
uint32_t cmd; /* LC_ID_DYLINKER, LC_LOAD_DYLINKER or
LC_DYLD_ENVIRONMENT */
uint32_t cmdsize; /* includes pathname string */
lc_str name; /* dynamic linker's path name */
};
struct linkedit_data_command {
uint32_t cmd; /* LC_CODE_SIGNATURE, LC_SEGMENT_SPLIT_INFO,
LC_FUNCTION_STARTS, LC_DATA_IN_CODE,
LC_DYLIB_CODE_SIGN_DRS,
LC_LINKER_OPTIMIZATION_HINT,
LC_DYLD_EXPORTS_TRIE, or
LC_DYLD_CHAINED_FIXUPS. */
uint32_t cmdsize; /* sizeof(struct linkedit_data_command) */
uint32_t dataoff; /* file offset of data in __LINKEDIT segment */
uint32_t datasize; /* file size of data in __LINKEDIT segment */
};
#define PLATFORM_MACOS 1
struct build_version_command {
uint32_t cmd; /* LC_BUILD_VERSION */
uint32_t cmdsize; /* sizeof(struct build_version_command) plus */
/* ntools * sizeof(struct build_tool_version) */
uint32_t platform; /* platform */
uint32_t minos; /* X.Y.Z is encoded in nibbles xxxx.yy.zz */
uint32_t sdk; /* X.Y.Z is encoded in nibbles xxxx.yy.zz */
uint32_t ntools; /* number of tool entries following this */
};
struct source_version_command {
uint32_t cmd; /* LC_SOURCE_VERSION */
uint32_t cmdsize; /* 16 */
uint64_t version; /* A.B.C.D.E packed as a24.b10.c10.d10.e10 */
};
struct symtab_command {
uint32_t cmd; /* LC_SYMTAB */
uint32_t cmdsize; /* sizeof(struct symtab_command) */
uint32_t symoff; /* symbol table offset */
uint32_t nsyms; /* number of symbol table entries */
uint32_t stroff; /* string table offset */
uint32_t strsize; /* string table size in bytes */
};
struct dysymtab_command {
uint32_t cmd; /* LC_DYSYMTAB */
uint32_t cmdsize; /* sizeof(struct dysymtab_command) */
uint32_t ilocalsym; /* index to local symbols */
uint32_t nlocalsym; /* number of local symbols */
uint32_t iextdefsym;/* index to externally defined symbols */
uint32_t nextdefsym;/* number of externally defined symbols */
uint32_t iundefsym; /* index to undefined symbols */
uint32_t nundefsym; /* number of undefined symbols */
uint32_t tocoff; /* file offset to table of contents */
uint32_t ntoc; /* number of entries in table of contents */
uint32_t modtaboff; /* file offset to module table */
uint32_t nmodtab; /* number of module table entries */
uint32_t extrefsymoff; /* offset to referenced symbol table */
uint32_t nextrefsyms; /* number of referenced symbol table entries */
uint32_t indirectsymoff;/* file offset to the indirect symbol table */
uint32_t nindirectsyms; /* number of indirect symbol table entries */
uint32_t extreloff; /* offset to external relocation entries */
uint32_t nextrel; /* number of external relocation entries */
uint32_t locreloff; /* offset to local relocation entries */
uint32_t nlocrel; /* number of local relocation entries */
};
#define BIND_OPCODE_DONE 0x00
#define BIND_OPCODE_SET_DYLIB_SPECIAL_IMM 0x30
#define BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM 0x40
#define BIND_OPCODE_SET_TYPE_IMM 0x50
#define BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB 0x70
#define BIND_OPCODE_DO_BIND 0x90
#define BIND_SYMBOL_FLAGS_WEAK_IMPORT 0x1
#define BIND_TYPE_POINTER 1
#define BIND_SPECIAL_DYLIB_FLAT_LOOKUP -2
#define REBASE_OPCODE_DONE 0x00
#define REBASE_OPCODE_SET_TYPE_IMM 0x10
#define REBASE_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB 0x20
#define REBASE_OPCODE_DO_REBASE_IMM_TIMES 0x50
#define REBASE_TYPE_POINTER 1
#define EXPORT_SYMBOL_FLAGS_KIND_REGULAR 0x00
#define EXPORT_SYMBOL_FLAGS_KIND_ABSOLUTE 0x02
#define EXPORT_SYMBOL_FLAGS_WEAK_DEFINITION 0x04
struct dyld_info_command {
uint32_t cmd; /* LC_DYLD_INFO or LC_DYLD_INFO_ONLY */
uint32_t cmdsize; /* sizeof(struct dyld_info_command) */
uint32_t rebase_off; /* file offset to rebase info */
uint32_t rebase_size; /* size of rebase info */
uint32_t bind_off; /* file offset to binding info */
uint32_t bind_size; /* size of binding info */
uint32_t weak_bind_off; /* file offset to weak binding info */
uint32_t weak_bind_size; /* size of weak binding info */
uint32_t lazy_bind_off; /* file offset to lazy binding info */
uint32_t lazy_bind_size; /* size of lazy binding infs */
uint32_t export_off; /* file offset to lazy binding info */
uint32_t export_size; /* size of lazy binding infs */
};
#define INDIRECT_SYMBOL_LOCAL 0x80000000
struct entry_point_command {
uint32_t cmd; /* LC_MAIN only used in MH_EXECUTE filetypes */
uint32_t cmdsize; /* 24 */
uint64_t entryoff; /* file (__TEXT) offset of main() */
uint64_t stacksize;/* if not zero, initial stack size */
};
enum skind {
sk_unknown = 0,
sk_discard,
sk_text,
sk_stubs,
sk_stub_helper,
sk_ro_data,
sk_uw_info,
sk_nl_ptr, // non-lazy pointers, aka GOT
sk_debug_info,
sk_debug_abbrev,
sk_debug_line,
sk_debug_aranges,
sk_debug_str,
sk_debug_line_str,
sk_stab,
sk_stab_str,
sk_la_ptr, // lazy pointers
sk_init,
sk_fini,
sk_rw_data,
sk_bss,
sk_linkedit,
sk_last
};
struct nlist_64 {
uint32_t n_strx; /* index into the string table */
uint8_t n_type; /* type flag, see below */
uint8_t n_sect; /* section number or NO_SECT */
uint16_t n_desc; /* see <mach-o/stab.h> */
uint64_t n_value; /* value of this symbol (or stab offset) */
};
#define N_UNDF 0x0
#define N_ABS 0x2
#define N_EXT 0x1
#define N_SECT 0xe
#define N_WEAK_REF 0x0040
#define N_WEAK_DEF 0x0080
struct macho {
struct mach_header_64 mh;
int *seg2lc, nseg;
struct load_command **lc;
struct entry_point_command *ep;
int nlc;
struct {
Section *s;
int machosect;
} sk_to_sect[sk_last];
int *elfsectomacho;
int *e2msym;
Section *symtab, *strtab, *indirsyms, *stubs, *exports;
uint32_t ilocal, iextdef, iundef;
int stubsym, n_got, nr_plt;
int segment[sk_last];
#ifdef CONFIG_NEW_MACHO
Section *chained_fixups;
int n_bind;
int n_bind_rebase;
struct bind_rebase {
int section;
int bind;
ElfW_Rel rel;
} *bind_rebase;
#else
Section *rebase, *binding, *weak_binding, *lazy_binding;
Section *stub_helper, *la_symbol_ptr;
struct dyld_info_command *dyldinfo;
int helpsym, lasym, dyld_private, dyld_stub_binder;
int n_lazy_bind;
struct s_lazy_bind {
int section;
int bind_offset;
int la_symbol_offset;
ElfW_Rel rel;
} *s_lazy_bind;
int n_rebase;
struct s_rebase {
int section;
ElfW_Rel rel;
} *s_rebase;
int n_bind;
struct bind {
int section;
ElfW_Rel rel;
} *bind;
#endif
};
#define SHT_LINKEDIT (SHT_LOOS + 42)
#define SHN_FROMDLL (SHN_LOOS + 2) /* Symbol is undefined, comes from a DLL */
static void * add_lc(struct macho *mo, uint32_t cmd, uint32_t cmdsize)
{
struct load_command *lc = tcc_mallocz(cmdsize);
lc->cmd = cmd;
lc->cmdsize = cmdsize;
mo->lc = tcc_realloc(mo->lc, sizeof(mo->lc[0]) * (mo->nlc + 1));
mo->lc[mo->nlc++] = lc;
return lc;
}
static struct segment_command_64 * add_segment(struct macho *mo, const char *name)
{
struct segment_command_64 *sc = add_lc(mo, LC_SEGMENT_64, sizeof(*sc));
strncpy(sc->segname, name, 16);
mo->seg2lc = tcc_realloc(mo->seg2lc, sizeof(*mo->seg2lc) * (mo->nseg + 1));
mo->seg2lc[mo->nseg++] = mo->nlc - 1;
return sc;
}
static struct segment_command_64 * get_segment(struct macho *mo, int i)
{
return (struct segment_command_64 *) (mo->lc[mo->seg2lc[i]]);
}
static int add_section(struct macho *mo, struct segment_command_64 **_seg, const char *name)
{
struct segment_command_64 *seg = *_seg;
int ret = seg->nsects;
struct section_64 *sec;
seg->nsects++;
seg->cmdsize += sizeof(*sec);
seg = tcc_realloc(seg, sizeof(*seg) + seg->nsects * sizeof(*sec));
sec = (struct section_64*)((char*)seg + sizeof(*seg)) + ret;
memset(sec, 0, sizeof(*sec));
strncpy(sec->sectname, name, 16);
strncpy(sec->segname, seg->segname, 16);
*_seg = seg;
return ret;
}
static struct section_64 *get_section(struct segment_command_64 *seg, int i)
{
return (struct section_64*)((char*)seg + sizeof(*seg)) + i;
}
static void * add_dylib(struct macho *mo, char *name)
{
struct dylib_command *lc;
int sz = (sizeof(*lc) + strlen(name) + 1 + 7) & -8;
lc = add_lc(mo, LC_LOAD_DYLIB, sz);
lc->name = sizeof(*lc);
strcpy((char*)lc + lc->name, name);
lc->timestamp = 2;
lc->current_version = 1 << 16;
lc->compatibility_version = 1 << 16;
return lc;
}
static int uleb128_size (unsigned long long value)
{
int size = 0;
do {
value >>= 7;
size++;
} while (value != 0);
return size;
}
static void write_uleb128(Section *section, uint64_t value)
{
do {
unsigned char byte = value & 0x7f;
uint8_t *ptr = section_ptr_add(section, 1);
value >>= 7;
*ptr = byte | (value ? 0x80 : 0);
} while (value != 0);
}
static void tcc_macho_add_destructor(TCCState *s1)
{
int init_sym, mh_execute_header, at_exit_sym;
Section *s;
ElfW_Rel *rel;
uint8_t *ptr;
mh_execute_header = put_elf_sym(s1->symtab, -4096, 0,
ELFW(ST_INFO)(STB_GLOBAL, STT_OBJECT), 0,
text_section->sh_num, "__mh_execute_header");
s = find_section(s1, ".fini_array");
if (s->data_offset == 0)
return;
init_sym = put_elf_sym(s1->symtab, text_section->data_offset, 0,
ELFW(ST_INFO)(STB_LOCAL, STT_FUNC), 0,
text_section->sh_num, "___GLOBAL_init_65535");
at_exit_sym = put_elf_sym(s1->symtab, 0, 0,
ELFW(ST_INFO)(STB_GLOBAL, STT_FUNC), 0,
SHN_UNDEF, "___cxa_atexit");
#ifdef TCC_TARGET_X86_64
ptr = section_ptr_add(text_section, 4);
ptr[0] = 0x55; // pushq %rbp
ptr[1] = 0x48; // movq %rsp, %rbp
ptr[2] = 0x89;
ptr[3] = 0xe5;
for_each_elem(s->reloc, 0, rel, ElfW_Rel) {
int sym_index = ELFW(R_SYM)(rel->r_info);
ptr = section_ptr_add(text_section, 26);
ptr[0] = 0x48; // lea destructor(%rip),%rax
ptr[1] = 0x8d;
ptr[2] = 0x05;
put_elf_reloca(s1->symtab, text_section,
text_section->data_offset - 23,
R_X86_64_PC32, sym_index, -4);
ptr[7] = 0x48; // mov %rax,%rdi
ptr[8] = 0x89;
ptr[9] = 0xc7;
ptr[10] = 0x31; // xorl %ecx, %ecx
ptr[11] = 0xc9;
ptr[12] = 0x89; // movl %ecx, %esi
ptr[13] = 0xce;
ptr[14] = 0x48; // lea mh_execute_header(%rip),%rdx
ptr[15] = 0x8d;
ptr[16] = 0x15;
put_elf_reloca(s1->symtab, text_section,
text_section->data_offset - 9,
R_X86_64_PC32, mh_execute_header, -4);
ptr[21] = 0xe8; // call __cxa_atexit
put_elf_reloca(s1->symtab, text_section,
text_section->data_offset - 4,
R_X86_64_PLT32, at_exit_sym, -4);
}
ptr = section_ptr_add(text_section, 2);
ptr[0] = 0x5d; // pop %rbp
ptr[1] = 0xc3; // ret
#elif defined TCC_TARGET_ARM64
ptr = section_ptr_add(text_section, 8);
write32le(ptr, 0xa9bf7bfd); // stp x29, x30, [sp, #-16]!
write32le(ptr + 4, 0x910003fd); // mov x29, sp
for_each_elem(s->reloc, 0, rel, ElfW_Rel) {
int sym_index = ELFW(R_SYM)(rel->r_info);
ptr = section_ptr_add(text_section, 24);
put_elf_reloc(s1->symtab, text_section,
text_section->data_offset - 24,
R_AARCH64_ADR_PREL_PG_HI21, sym_index);
write32le(ptr, 0x90000000); // adrp x0, destructor@page
put_elf_reloc(s1->symtab, text_section,
text_section->data_offset - 20,
R_AARCH64_LDST8_ABS_LO12_NC, sym_index);
write32le(ptr + 4, 0x91000000); // add x0,x0,destructor@pageoff
write32le(ptr + 8, 0xd2800001); // mov x1, #0
put_elf_reloc(s1->symtab, text_section,
text_section->data_offset - 12,
R_AARCH64_ADR_PREL_PG_HI21, mh_execute_header);
write32le(ptr + 12, 0x90000002); // adrp x2, mh_execute_header@page
put_elf_reloc(s1->symtab, text_section,
text_section->data_offset - 8,
R_AARCH64_LDST8_ABS_LO12_NC, mh_execute_header);
write32le(ptr + 16, 0x91000042); // add x2,x2,mh_execute_header@pageoff
put_elf_reloc(s1->symtab, text_section,
text_section->data_offset - 4,
R_AARCH64_CALL26, at_exit_sym);
write32le(ptr + 20, 0x94000000); // bl __cxa_atexit
}
ptr = section_ptr_add(text_section, 8);
write32le(ptr, 0xa8c17bfd); // ldp x29, x30, [sp], #16
write32le(ptr + 4, 0xd65f03c0); // ret
#endif
s->reloc->data_offset = s->data_offset = 0;
s->sh_flags &= ~SHF_ALLOC;
add_array (s1, ".init_array", init_sym);
}
#ifdef CONFIG_NEW_MACHO
static void bind_rebase_add(struct macho *mo, int bind, int sh_info,
ElfW_Rel *rel, struct sym_attr *attr)
{
mo->bind_rebase = tcc_realloc(mo->bind_rebase, (mo->n_bind_rebase + 1) *
sizeof(struct bind_rebase));
mo->bind_rebase[mo->n_bind_rebase].section = sh_info;
mo->bind_rebase[mo->n_bind_rebase].bind = bind;
mo->bind_rebase[mo->n_bind_rebase].rel = *rel;
if (attr)
mo->bind_rebase[mo->n_bind_rebase].rel.r_offset = attr->got_offset;
mo->n_bind_rebase++;
mo->n_bind += bind;
}
static void check_relocs(TCCState *s1, struct macho *mo)
{
Section *s;
ElfW_Rel *rel, save_rel;
ElfW(Sym) *sym;
int i, j, type, gotplt_entry, sym_index, for_code;
uint32_t *pi, *goti;
struct sym_attr *attr;
goti = NULL;
mo->nr_plt = mo->n_got = 0;
for (i = 1; i < s1->nb_sections; i++) {
s = s1->sections[i];
if (s->sh_type != SHT_RELX ||
!strncmp(s1->sections[s->sh_info]->name, ".debug_", 7))
continue;
for_each_elem(s, 0, rel, ElfW_Rel) {
save_rel = *rel;
type = ELFW(R_TYPE)(rel->r_info);
gotplt_entry = gotplt_entry_type(type);
for_code = code_reloc(type);
/* We generate a non-lazy pointer for used undefined symbols
and for defined symbols that must have a place for their
address due to codegen (i.e. a reloc requiring a got slot). */
sym_index = ELFW(R_SYM)(rel->r_info);
sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
if (sym->st_shndx == SHN_UNDEF
|| gotplt_entry == ALWAYS_GOTPLT_ENTRY) {
attr = get_sym_attr(s1, sym_index, 1);
if (!attr->dyn_index) {
attr->got_offset = s1->got->data_offset;
attr->plt_offset = -1;
attr->dyn_index = 1; /* used as flag */
section_ptr_add(s1->got, PTR_SIZE);
put_elf_reloc(s1->symtab, s1->got, attr->got_offset,
R_JMP_SLOT, sym_index);
goti = tcc_realloc(goti, (mo->n_got + 1) * sizeof(*goti));
if (ELFW(ST_BIND)(sym->st_info) == STB_LOCAL) {
if (sym->st_shndx == SHN_UNDEF)
tcc_error("undefined local symbo: '%s'",
(char *) symtab_section->link->data + sym->st_name);
goti[mo->n_got++] = INDIRECT_SYMBOL_LOCAL;
} else {
goti[mo->n_got++] = mo->e2msym[sym_index];
if (sym->st_shndx == SHN_UNDEF
#ifdef TCC_TARGET_X86_64
&& type == R_X86_64_GOTPCREL
#elif defined TCC_TARGET_ARM64
&& type == R_AARCH64_ADR_GOT_PAGE
#endif
) {
attr->plt_offset = -mo->n_bind_rebase - 2;
bind_rebase_add(mo, 1, s1->got->reloc->sh_info, &save_rel, attr);
s1->got->reloc->data_offset -= sizeof (ElfW_Rel);
}
if (for_code && sym->st_shndx == SHN_UNDEF)
s1->got->reloc->data_offset -= sizeof (ElfW_Rel);
}
}
if (for_code && sym->st_shndx == SHN_UNDEF) {
if ((int)attr->plt_offset < -1) {
/* remove above bind and replace with plt */
mo->bind_rebase[-attr->plt_offset - 2].bind = 2;
attr->plt_offset = -1;
}
if (attr->plt_offset == -1) {
uint8_t *jmp;
attr->plt_offset = mo->stubs->data_offset;
#ifdef TCC_TARGET_X86_64
if (type != R_X86_64_PLT32)
continue;
jmp = section_ptr_add(mo->stubs, 6);
jmp[0] = 0xff; /* jmpq *ofs(%rip) */
jmp[1] = 0x25;
put_elf_reloc(s1->symtab, mo->stubs,
attr->plt_offset + 2,
R_X86_64_GOTPCREL, sym_index);
#elif defined TCC_TARGET_ARM64
if (type != R_AARCH64_CALL26)
continue;
jmp = section_ptr_add(mo->stubs, 12);
put_elf_reloc(s1->symtab, mo->stubs,
attr->plt_offset,
R_AARCH64_ADR_GOT_PAGE, sym_index);
write32le(jmp, // adrp x16, #sym
0x90000010);
put_elf_reloc(s1->symtab, mo->stubs,
attr->plt_offset + 4,
R_AARCH64_LD64_GOT_LO12_NC, sym_index);
write32le(jmp + 4, // ld x16,[x16, #sym]
0xf9400210);
write32le(jmp + 8, // br x16
0xd61f0200);
#endif
bind_rebase_add(mo, 1, s1->got->reloc->sh_info, &save_rel, attr);
pi = section_ptr_add(mo->indirsyms, sizeof(*pi));
*pi = mo->e2msym[sym_index];
mo->nr_plt++;
}
rel->r_info = ELFW(R_INFO)(mo->stubsym, type);
rel->r_addend += attr->plt_offset;
}
}
if (type == R_DATA_PTR || type == R_JMP_SLOT)
bind_rebase_add(mo, sym->st_shndx == SHN_UNDEF ? 1 : 0,
s->sh_info, &save_rel, NULL);
}
}
/* remove deleted binds */
for (i = 0, j = 0; i < mo->n_bind_rebase; i++)
if (mo->bind_rebase[i].bind == 2)
mo->n_bind--;
else
mo->bind_rebase[j++] = mo->bind_rebase[i];
mo->n_bind_rebase = j;
pi = section_ptr_add(mo->indirsyms, mo->n_got * sizeof(*pi));
memcpy(pi, goti, mo->n_got * sizeof(*pi));
tcc_free(goti);
}
#else
static void check_relocs(TCCState *s1, struct macho *mo)
{
uint8_t *jmp;
Section *s;
ElfW_Rel *rel, save_rel;
ElfW(Sym) *sym;
int i, type, gotplt_entry, sym_index, for_code;
int bind_offset, la_symbol_offset;
uint32_t *pi, *goti;
struct sym_attr *attr;
#ifdef TCC_TARGET_X86_64
jmp = section_ptr_add(mo->stub_helper, 16);
jmp[0] = 0x4c; /* leaq _dyld_private(%rip), %r11 */
jmp[1] = 0x8d;
jmp[2] = 0x1d;
put_elf_reloca(s1->symtab, mo->stub_helper, 3,
R_X86_64_PC32, mo->dyld_private, -4);
jmp[7] = 0x41; /* pushq %r11 */
jmp[8] = 0x53;
jmp[9] = 0xff; /* jmpq *dyld_stub_binder@GOT(%rip) */
jmp[10] = 0x25;
put_elf_reloca(s1->symtab, mo->stub_helper, 11,
R_X86_64_GOTPCREL, mo->dyld_stub_binder, -4);
jmp[15] = 0x90; /* nop */
#elif defined TCC_TARGET_ARM64
jmp = section_ptr_add(mo->stub_helper, 24);
put_elf_reloc(s1->symtab, mo->stub_helper, 0,
R_AARCH64_ADR_PREL_PG_HI21, mo->dyld_private);
write32le(jmp, 0x90000011); // adrp x17, _dyld_private@page
put_elf_reloc(s1->symtab, mo->stub_helper, 4,
R_AARCH64_LDST64_ABS_LO12_NC, mo->dyld_private);
write32le(jmp + 4, 0x91000231); // add x17,x17,_dyld_private@pageoff
write32le(jmp + 8, 0xa9bf47f0); // stp x16/x17, [sp, #-16]!
put_elf_reloc(s1->symtab, mo->stub_helper, 12,
R_AARCH64_ADR_GOT_PAGE, mo->dyld_stub_binder);
write32le(jmp + 12, 0x90000010); // adrp x16, dyld_stub_binder@page
put_elf_reloc(s1->symtab, mo->stub_helper, 16,
R_AARCH64_LD64_GOT_LO12_NC, mo->dyld_stub_binder);
write32le(jmp + 16, 0xf9400210); // ldr x16,[x16,dyld_stub_binder@pageoff]
write32le(jmp + 20, 0xd61f0200); // br x16
#endif
goti = NULL;
mo->nr_plt = mo->n_got = 0;
for (i = 1; i < s1->nb_sections; i++) {
s = s1->sections[i];
if (s->sh_type != SHT_RELX ||
!strncmp(s1->sections[s->sh_info]->name, ".debug_", 7))
continue;
for_each_elem(s, 0, rel, ElfW_Rel) {
save_rel = *rel;
type = ELFW(R_TYPE)(rel->r_info);
gotplt_entry = gotplt_entry_type(type);
for_code = code_reloc(type);
/* We generate a non-lazy pointer for used undefined symbols
and for defined symbols that must have a place for their
address due to codegen (i.e. a reloc requiring a got slot). */
sym_index = ELFW(R_SYM)(rel->r_info);
sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
if (sym->st_shndx == SHN_UNDEF
|| gotplt_entry == ALWAYS_GOTPLT_ENTRY) {
attr = get_sym_attr(s1, sym_index, 1);
if (!attr->dyn_index) {
attr->got_offset = s1->got->data_offset;
attr->plt_offset = -1;
attr->dyn_index = 1; /* used as flag */
section_ptr_add(s1->got, PTR_SIZE);
put_elf_reloc(s1->symtab, s1->got, attr->got_offset,
R_JMP_SLOT, sym_index);
goti = tcc_realloc(goti, (mo->n_got + 1) * sizeof(*goti));
if (ELFW(ST_BIND)(sym->st_info) == STB_LOCAL) {
if (sym->st_shndx == SHN_UNDEF)
tcc_error("undefined local symbo: '%s'",
(char *) symtab_section->link->data + sym->st_name);
goti[mo->n_got++] = INDIRECT_SYMBOL_LOCAL;
} else {
goti[mo->n_got++] = mo->e2msym[sym_index];
if (sym->st_shndx == SHN_UNDEF
#ifdef TCC_TARGET_X86_64
&& type == R_X86_64_GOTPCREL
#elif defined TCC_TARGET_ARM64
&& type == R_AARCH64_ADR_GOT_PAGE
#endif
) {
mo->bind =
tcc_realloc(mo->bind,
(mo->n_bind + 1) *
sizeof(struct bind));
mo->bind[mo->n_bind].section = s1->got->reloc->sh_info;
mo->bind[mo->n_bind].rel = save_rel;
mo->bind[mo->n_bind].rel.r_offset = attr->got_offset;
mo->n_bind++;
s1->got->reloc->data_offset -= sizeof (ElfW_Rel);
}
}
}
if (for_code && sym->st_shndx == SHN_UNDEF) {
if (attr->plt_offset == -1) {
attr->plt_offset = mo->stubs->data_offset;
#ifdef TCC_TARGET_X86_64
if (type != R_X86_64_PLT32)
continue;
/* __stubs */
jmp = section_ptr_add(mo->stubs, 6);
jmp[0] = 0xff; /* jmpq *__la_symbol_ptr(%rip) */
jmp[1] = 0x25;
put_elf_reloca(s1->symtab, mo->stubs,
mo->stubs->data_offset - 4,
R_X86_64_PC32, mo->lasym,
mo->la_symbol_ptr->data_offset - 4);
/* __stub_helper */
bind_offset = mo->stub_helper->data_offset + 1;
jmp = section_ptr_add(mo->stub_helper, 10);
jmp[0] = 0x68; /* pushq $bind_offset */
jmp[5] = 0xe9; /* jmpq __stub_helper */
write32le(jmp + 6, -mo->stub_helper->data_offset);
/* __la_symbol_ptr */
la_symbol_offset = mo->la_symbol_ptr->data_offset;
put_elf_reloca(s1->symtab, mo->la_symbol_ptr,
mo->la_symbol_ptr->data_offset,
R_DATA_PTR, mo->helpsym,
mo->stub_helper->data_offset - 10);
section_ptr_add(mo->la_symbol_ptr, PTR_SIZE);
#elif defined TCC_TARGET_ARM64
if (type != R_AARCH64_CALL26)
continue;
/* __stubs */
jmp = section_ptr_add(mo->stubs, 12);
put_elf_reloca(s1->symtab, mo->stubs,
mo->stubs->data_offset - 12,
R_AARCH64_ADR_PREL_PG_HI21, mo->lasym,
mo->la_symbol_ptr->data_offset);
write32le(jmp, // adrp x16, __la_symbol_ptr@page
0x90000010);
put_elf_reloca(s1->symtab, mo->stubs,
mo->stubs->data_offset - 8,
R_AARCH64_LDST64_ABS_LO12_NC, mo->lasym,
mo->la_symbol_ptr->data_offset);
write32le(jmp + 4, // ldr x16,[x16, __la_symbol_ptr@pageoff]
0xf9400210);
write32le(jmp + 8, // br x16
0xd61f0200);
/* __stub_helper */
bind_offset = mo->stub_helper->data_offset + 8;
jmp = section_ptr_add(mo->stub_helper, 12);
write32le(jmp + 0, // ldr w16, l0
0x18000050);
write32le(jmp + 4, // b stubHelperHeader
0x14000000 +
((-(mo->stub_helper->data_offset - 8) / 4) &
0x3ffffff));
write32le(jmp + 8, 0); // l0: .long bind_offset
/* __la_symbol_ptr */
la_symbol_offset = mo->la_symbol_ptr->data_offset;
put_elf_reloca(s1->symtab, mo->la_symbol_ptr,
mo->la_symbol_ptr->data_offset,
R_DATA_PTR, mo->helpsym,
mo->stub_helper->data_offset - 12);
section_ptr_add(mo->la_symbol_ptr, PTR_SIZE);
#endif
mo->s_lazy_bind =
tcc_realloc(mo->s_lazy_bind, (mo->n_lazy_bind + 1) *
sizeof(struct s_lazy_bind));
mo->s_lazy_bind[mo->n_lazy_bind].section =
mo->stub_helper->reloc->sh_info;
mo->s_lazy_bind[mo->n_lazy_bind].bind_offset =
bind_offset;
mo->s_lazy_bind[mo->n_lazy_bind].la_symbol_offset =
la_symbol_offset;
mo->s_lazy_bind[mo->n_lazy_bind].rel = save_rel;
mo->s_lazy_bind[mo->n_lazy_bind].rel.r_offset =
attr->plt_offset;
mo->n_lazy_bind++;
pi = section_ptr_add(mo->indirsyms, sizeof(*pi));
*pi = mo->e2msym[sym_index];
mo->nr_plt++;
}
rel->r_info = ELFW(R_INFO)(mo->stubsym, type);
rel->r_addend += attr->plt_offset;
}
}
if (type == R_DATA_PTR || type == R_JMP_SLOT) {
if (sym->st_shndx == SHN_UNDEF) {
mo->bind = tcc_realloc(mo->bind,
(mo->n_bind + 1) *
sizeof(struct bind));
mo->bind[mo->n_bind].section = s->sh_info;
mo->bind[mo->n_bind].rel = save_rel;
mo->n_bind++;
}
else {
mo->s_rebase =
tcc_realloc(mo->s_rebase, (mo->n_rebase + 1) *
sizeof(struct s_rebase));
mo->s_rebase[mo->n_rebase].section = s->sh_info;
mo->s_rebase[mo->n_rebase].rel = save_rel;
mo->n_rebase++;
}
}
}
}
pi = section_ptr_add(mo->indirsyms, mo->n_got * sizeof(*pi));
memcpy(pi, goti, mo->n_got * sizeof(*pi));
pi = section_ptr_add(mo->indirsyms, mo->nr_plt * sizeof(*pi));
memcpy(pi, mo->indirsyms->data, mo->nr_plt * sizeof(*pi));
tcc_free(goti);
}