/*
* 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);
}
#endif
static int check_symbols(TCCState *s1, struct macho *mo)
{
int sym_index, sym_end;
int ret = 0;
mo->ilocal = mo->iextdef = mo->iundef = -1;
sym_end = symtab_section->data_offset / sizeof(ElfW(Sym));
for (sym_index = 1; sym_index < sym_end; ++sym_index) {
int elf_index = ((struct nlist_64 *)mo->symtab->data + sym_index - 1)->n_value;
ElfW(Sym) *sym = (ElfW(Sym) *)symtab_section->data + elf_index;
const char *name = (char*)symtab_section->link->data + sym->st_name;
unsigned type = ELFW(ST_TYPE)(sym->st_info);
unsigned bind = ELFW(ST_BIND)(sym->st_info);
unsigned vis = ELFW(ST_VISIBILITY)(sym->st_other);
dprintf("%4d (%4d): %09lx %4d %4d %4d %3d %s\n",
sym_index, elf_index, (long)sym->st_value,
type, bind, vis, sym->st_shndx, name);
if (bind == STB_LOCAL) {
if (mo->ilocal == -1)
mo->ilocal = sym_index - 1;
if (mo->iextdef != -1 || mo->iundef != -1)
tcc_error("local syms after global ones");
} else if (sym->st_shndx != SHN_UNDEF) {
if (mo->iextdef == -1)
mo->iextdef = sym_index - 1;
if (mo->iundef != -1)
tcc_error("external defined symbol after undefined");
} else if (sym->st_shndx == SHN_UNDEF) {
if (mo->iundef == -1)
mo->iundef = sym_index - 1;
if (ELFW(ST_BIND)(sym->st_info) == STB_WEAK
|| s1->output_type != TCC_OUTPUT_EXE
|| find_elf_sym(s1->dynsymtab_section, name)) {
/* Mark the symbol as coming from a dylib so that
relocate_syms doesn't complain. Normally bind_exe_dynsyms
would do this check, and place the symbol into dynsym
which is checked by relocate_syms. But Mach-O doesn't use
bind_exe_dynsyms. */
sym->st_shndx = SHN_FROMDLL;
continue;
}
tcc_error_noabort("undefined symbol '%s'", name);
ret = -1;
}
}
return ret;
}
static void convert_symbol(TCCState *s1, struct macho *mo, struct nlist_64 *pn)
{
struct nlist_64 n = *pn;
ElfSym *sym = (ElfW(Sym) *)symtab_section->data + pn->n_value;
const char *name = (char*)symtab_section->link->data + sym->st_name;
switch(ELFW(ST_TYPE)(sym->st_info)) {
case STT_NOTYPE:
case STT_OBJECT:
case STT_FUNC:
case STT_SECTION:
n.n_type = N_SECT;
break;
case STT_FILE:
n.n_type = N_ABS;
break;
default:
tcc_error("unhandled ELF symbol type %d %s",
ELFW(ST_TYPE)(sym->st_info), name);
}
if (sym->st_shndx == SHN_UNDEF)
tcc_error("should have been rewritten to SHN_FROMDLL: %s", name);
else if (sym->st_shndx == SHN_FROMDLL)
n.n_type = N_UNDF, n.n_sect = 0;
else if (sym->st_shndx == SHN_ABS)
n.n_type = N_ABS, n.n_sect = 0;
else if (sym->st_shndx >= SHN_LORESERVE)
tcc_error("unhandled ELF symbol section %d %s", sym->st_shndx, name);
else if (!mo->elfsectomacho[sym->st_shndx]) {
if (strncmp(s1->sections[sym->st_shndx]->name, ".debug_", 7))
tcc_error("ELF section %d(%s) not mapped into Mach-O for symbol %s",
sym->st_shndx, s1->sections[sym->st_shndx]->name, name);
}
else
n.n_sect = mo->elfsectomacho[sym->st_shndx];
if (ELFW(ST_BIND)(sym->st_info) == STB_GLOBAL)
n.n_type |= N_EXT;
else if (ELFW(ST_BIND)(sym->st_info) == STB_WEAK)
n.n_desc |= N_WEAK_REF | (n.n_type != N_UNDF ? N_WEAK_DEF : 0);
n.n_strx = pn->n_strx;
n.n_value = sym->st_value;
*pn = n;
}
static void convert_symbols(TCCState *s1, struct macho *mo)
{
struct nlist_64 *pn;
for_each_elem(mo->symtab, 0, pn, struct nlist_64)
convert_symbol(s1, mo, pn);
}
static int machosymcmp(const void *_a, const void *_b, void *arg)
{
TCCState *s1 = arg;
int ea = ((struct nlist_64 *)_a)->n_value;
int eb = ((struct nlist_64 *)_b)->n_value;
ElfSym *sa = (ElfSym *)symtab_section->data + ea;
ElfSym *sb = (ElfSym *)symtab_section->data + eb;
int r;
/* locals, then defined externals, then undefined externals, the
last two sections also by name, otherwise stable sort */
r = (ELFW(ST_BIND)(sb->st_info) == STB_LOCAL)
- (ELFW(ST_BIND)(sa->st_info) == STB_LOCAL);
if (r)
return r;
r = (sa->st_shndx == SHN_UNDEF) - (sb->st_shndx == SHN_UNDEF);
if (r)
return r;
if (ELFW(ST_BIND)(sa->st_info) != STB_LOCAL) {
const char * na = (char*)symtab_section->link->data + sa->st_name;
const char * nb = (char*)symtab_section->link->data + sb->st_name;
r = strcmp(na, nb);
if (r)
return r;
}
return ea - eb;
}
/* cannot use qsort because code has to be reentrant */
static void tcc_qsort (void *base, size_t nel, size_t width,
int (*comp)(const void *, const void *, void *), void *arg)
{
size_t wnel, gap, wgap, i, j, k;
char *a, *b, tmp;
wnel = width * nel;
for (gap = 0; ++gap < nel;)
gap *= 3;
while ( gap /= 3 ) {
wgap = width * gap;
for (i = wgap; i < wnel; i += width) {
for (j = i - wgap; ;j -= wgap) {
a = j + (char *)base;
b = a + wgap;
if ( (*comp)(a, b, arg) <= 0 )
break;
k = width;
do {
tmp = *a;
*a++ = *b;
*b++ = tmp;
} while ( --k );
if (j < wgap)
break;
}
}
}
}
static void create_symtab(TCCState *s1, struct macho *mo)
{
int sym_index, sym_end;
struct nlist_64 *pn;
/* Stub creation belongs to check_relocs, but we need to create
the symbol now, so its included in the sorting. */
mo->stubs = new_section(s1, "__stubs", SHT_PROGBITS, SHF_ALLOC | SHF_EXECINSTR);
s1->got = new_section(s1, ".got", SHT_PROGBITS, SHF_ALLOC | SHF_WRITE);
mo->stubsym = put_elf_sym(s1->symtab, 0, 0,
ELFW(ST_INFO)(STB_LOCAL, STT_SECTION), 0,
mo->stubs->sh_num, ".__stubs");
#ifdef CONFIG_NEW_MACHO
mo->chained_fixups = new_section(s1, "CHAINED_FIXUPS",
SHT_LINKEDIT, SHF_ALLOC | SHF_WRITE);
#else
mo->stub_helper = new_section(s1, "__stub_helper", SHT_PROGBITS, SHF_ALLOC | SHF_EXECINSTR);
mo->la_symbol_ptr = new_section(s1, "__la_symbol_ptr", SHT_PROGBITS, SHF_ALLOC | SHF_WRITE);
mo->helpsym = put_elf_sym(s1->symtab, 0, 0,
ELFW(ST_INFO)(STB_LOCAL, STT_SECTION), 0,
mo->stub_helper->sh_num, ".__stub_helper");
mo->lasym = put_elf_sym(s1->symtab, 0, 0,
ELFW(ST_INFO)(STB_LOCAL, STT_SECTION), 0,
mo->la_symbol_ptr->sh_num, ".__la_symbol_ptr");
section_ptr_add(data_section, -data_section->data_offset & (PTR_SIZE - 1));
mo->dyld_private = put_elf_sym(s1->symtab, data_section->data_offset, PTR_SIZE,
ELFW(ST_INFO)(STB_LOCAL, STT_OBJECT), 0,
data_section->sh_num, ".__dyld_private");
section_ptr_add(data_section, PTR_SIZE);
mo->dyld_stub_binder = put_elf_sym(s1->symtab, 0, 0,
ELFW(ST_INFO)(STB_GLOBAL, STT_OBJECT), 0,
SHN_UNDEF, "dyld_stub_binder");
mo->rebase = new_section(s1, "REBASE", SHT_LINKEDIT, SHF_ALLOC | SHF_WRITE);
mo->binding = new_section(s1, "BINDING", SHT_LINKEDIT, SHF_ALLOC | SHF_WRITE);
mo->weak_binding = new_section(s1, "WEAK_BINDING", SHT_LINKEDIT, SHF_ALLOC | SHF_WRITE);
mo->lazy_binding = new_section(s1, "LAZY_BINDING", SHT_LINKEDIT, SHF_ALLOC | SHF_WRITE);
#endif
mo->exports = new_section(s1, "EXPORT", SHT_LINKEDIT, SHF_ALLOC | SHF_WRITE);
mo->indirsyms = new_section(s1, "LEINDIR", SHT_LINKEDIT, SHF_ALLOC | SHF_WRITE);
mo->symtab = new_section(s1, "LESYMTAB", SHT_LINKEDIT, SHF_ALLOC | SHF_WRITE);
mo->strtab = new_section(s1, "LESTRTAB", SHT_LINKEDIT, SHF_ALLOC | SHF_WRITE);
put_elf_str(mo->strtab, " "); /* Mach-O starts strtab with a space */
sym_end = symtab_section->data_offset / sizeof(ElfW(Sym));
pn = section_ptr_add(mo->symtab, sizeof(*pn) * (sym_end - 1));
for (sym_index = 1; sym_index < sym_end; ++sym_index) {
ElfW(Sym) *sym = (ElfW(Sym) *)symtab_section->data + sym_index;
const char *name = (char*)symtab_section->link->data + sym->st_name;
pn[sym_index - 1].n_strx = put_elf_str(mo->strtab, name);
pn[sym_index - 1].n_value = sym_index;
}
section_ptr_add(mo->strtab, -mo->strtab->data_offset & (PTR_SIZE - 1));
tcc_qsort(pn, sym_end - 1, sizeof(*pn), machosymcmp, s1);
mo->e2msym = tcc_malloc(sym_end * sizeof(*mo->e2msym));
mo->e2msym[0] = -1;
for (sym_index = 1; sym_index < sym_end; ++sym_index) {
mo->e2msym[pn[sym_index - 1].n_value] = sym_index - 1;
}
}
const struct {
int seg_initial;
uint32_t flags;
const char *name;
} skinfo[sk_last] = {
/*[sk_unknown] =*/ { 0 },
/*[sk_discard] =*/ { 0 },
/*[sk_text] =*/ { 1, S_REGULAR | S_ATTR_PURE_INSTRUCTIONS
| S_ATTR_SOME_INSTRUCTIONS, "__text" },
/*[sk_stubs] =*/ { 1, S_REGULAR | S_ATTR_PURE_INSTRUCTIONS | S_SYMBOL_STUBS
| S_ATTR_SOME_INSTRUCTIONS , "__stubs" },
/*[sk_stub_helper] =*/ { 1, S_REGULAR | S_ATTR_PURE_INSTRUCTIONS
| S_ATTR_SOME_INSTRUCTIONS , "__stub_helper" },
/*[sk_ro_data] =*/ { 2, S_REGULAR, "__rodata" },
/*[sk_uw_info] =*/ { 0 },
/*[sk_nl_ptr] =*/ { 2, S_NON_LAZY_SYMBOL_POINTERS, "__got" },
/*[sk_debug_info] =*/ { 3, S_REGULAR | S_ATTR_DEBUG, "__debug_info" },
/*[sk_debug_abbrev] =*/ { 3, S_REGULAR | S_ATTR_DEBUG, "__debug_abbrev" },
/*[sk_debug_line] =*/ { 3, S_REGULAR | S_ATTR_DEBUG, "__debug_line" },
/*[sk_debug_aranges] =*/ { 3, S_REGULAR | S_ATTR_DEBUG, "__debug_aranges" },
/*[sk_debug_str] =*/ { 3, S_REGULAR | S_ATTR_DEBUG, "__debug_str" },
/*[sk_debug_line_str] =*/ { 3, S_REGULAR | S_ATTR_DEBUG, "__debug_line_str" },
/*[sk_stab] =*/ { 4, S_REGULAR, "__stab" },
/*[sk_stab_str] =*/ { 4, S_REGULAR, "__stab_str" },
/*[sk_la_ptr] =*/ { 4, S_LAZY_SYMBOL_POINTERS, "__la_symbol_ptr" },
/*[sk_init] =*/ { 4, S_MOD_INIT_FUNC_POINTERS, "__mod_init_func" },
/*[sk_fini] =*/ { 4, S_MOD_TERM_FUNC_POINTERS, "__mod_term_func" },
/*[sk_rw_data] =*/ { 4, S_REGULAR, "__data" },
/*[sk_bss] =*/ { 4, S_ZEROFILL, "__bss" },
/*[sk_linkedit] =*/ { 5, S_REGULAR, NULL },
};
#define START ((uint64_t)1 << 32)
const struct {
int used;
const char *name;
uint64_t vmaddr;
uint64_t vmsize;
vm_prot_t maxprot;
vm_prot_t initprot;
uint32_t flags;
} all_segment[] = {
{ 1, "__PAGEZERO", 0, START, 0, 0, 0 },
{ 0, "__TEXT", START, 0, 5, 5, 0 },
{ 0, "__DATA_CONST", -1, 0, 3, 3, SG_READ_ONLY },
{ 0, "__DWARF", -1, 0, 7, 3, 0 },
{ 0, "__DATA", -1, 0, 3, 3, 0 },
{ 1, "__LINKEDIT", -1, 0, 1, 1, 0 },
};
#define N_SEGMENT (sizeof(all_segment)/sizeof(all_segment[0]))
#ifdef CONFIG_NEW_MACHO
static void calc_fixup_size(TCCState *s1, struct macho *mo)
{
int i, size;
size = (sizeof(struct dyld_chained_fixups_header) + 7) & -8;
size += (sizeof(struct dyld_chained_starts_in_image) + (mo->nseg - 1) * sizeof(uint32_t) + 7) & -8;
for (i = (s1->output_type == TCC_OUTPUT_EXE); i < mo->nseg - 1; i++) {
int page_count = (get_segment(mo, i)->vmsize + SEG_PAGE_SIZE - 1) / SEG_PAGE_SIZE;
size += (sizeof(struct dyld_chained_starts_in_segment) + (page_count - 1) * sizeof(uint16_t) + 7) & -8;
}
size += mo->n_bind * sizeof (struct dyld_chained_import) + 1;
for (i = 0; i < mo->n_bind_rebase; i++) {
if (mo->bind_rebase[i].bind) {
int sym_index = ELFW(R_SYM)(mo->bind_rebase[i].rel.r_info);
ElfW(Sym) *sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
const char *name = (char *) symtab_section->link->data + sym->st_name;
size += strlen(name) + 1;
}
}
size = (size + 7) & -8;
section_ptr_add(mo->chained_fixups, size);
}
#else
static void set_segment_and_offset(TCCState *s1, struct macho *mo, addr_t addr,
uint8_t *ptr, int opcode,
Section *sec, addr_t offset)
{
int i;
struct segment_command_64 *seg = NULL;
for (i = (s1->output_type == TCC_OUTPUT_EXE); i < mo->nseg - 1; i++) {
seg = get_segment(mo, i);
if (addr >= seg->vmaddr && addr < (seg->vmaddr + seg->vmsize))
break;
}
*ptr = opcode | i;
write_uleb128(sec, offset - seg->vmaddr);
}
static void bind_rebase(TCCState *s1, struct macho *mo)
{
int i;
uint8_t *ptr;
ElfW(Sym) *sym;
const char *name;
for (i = 0; i < mo->n_lazy_bind; i++) {
int sym_index = ELFW(R_SYM)(mo->s_lazy_bind[i].rel.r_info);
sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
name = (char *) symtab_section->link->data + sym->st_name;
write32le(mo->stub_helper->data +
mo->s_lazy_bind[i].bind_offset,
mo->lazy_binding->data_offset);
ptr = section_ptr_add(mo->lazy_binding, 1);
set_segment_and_offset(s1, mo, mo->la_symbol_ptr->sh_addr, ptr,
BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB,
mo->lazy_binding,
mo->s_lazy_bind[i].la_symbol_offset +
mo->la_symbol_ptr->sh_addr);
ptr = section_ptr_add(mo->lazy_binding, 5 + strlen(name));
*ptr++ = BIND_OPCODE_SET_DYLIB_SPECIAL_IMM |
(BIND_SPECIAL_DYLIB_FLAT_LOOKUP & 0xf);
*ptr++ = BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM | 0;
strcpy((char *)ptr, name);
ptr += strlen(name) + 1;
*ptr++ = BIND_OPCODE_DO_BIND;
*ptr = BIND_OPCODE_DONE;
}
for (i = 0; i < mo->n_rebase; i++) {
Section *s = s1->sections[mo->s_rebase[i].section];
ptr = section_ptr_add(mo->rebase, 2);
*ptr++ = REBASE_OPCODE_SET_TYPE_IMM | REBASE_TYPE_POINTER;
set_segment_and_offset(s1, mo, s->sh_addr, ptr,
REBASE_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB,
mo->rebase,
mo->s_rebase[i].rel.r_offset +
s->sh_addr);
ptr = section_ptr_add(mo->rebase, 1);
*ptr = REBASE_OPCODE_DO_REBASE_IMM_TIMES | 1;
}
for (i = 0; i < mo->n_bind; i++) {
int sym_index = ELFW(R_SYM)(mo->bind[i].rel.r_info);
Section *s = s1->sections[mo->bind[i].section];
Section *binding;
sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
name = (char *) symtab_section->link->data + sym->st_name;
binding = ELFW(ST_BIND)(sym->st_info) == STB_WEAK
? mo->weak_binding : mo->binding;
ptr = section_ptr_add(binding, 4 + (binding == mo->binding) +
strlen(name));
if (binding == mo->binding)
*ptr++ = BIND_OPCODE_SET_DYLIB_SPECIAL_IMM |
(BIND_SPECIAL_DYLIB_FLAT_LOOKUP & 0xf);
*ptr++ = BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM |
(binding == mo->weak_binding
? BIND_SYMBOL_FLAGS_WEAK_IMPORT : 0);
strcpy((char *)ptr, name);
ptr += strlen(name) + 1;
*ptr++ = BIND_OPCODE_SET_TYPE_IMM | BIND_TYPE_POINTER;
set_segment_and_offset(s1, mo, s->sh_addr, ptr,
BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB,
binding,
mo->bind[i].rel.r_offset + s->sh_addr);
ptr = section_ptr_add(binding, 1);
*ptr++ = BIND_OPCODE_DO_BIND;
}
if (mo->rebase->data_offset) {
ptr = section_ptr_add(mo->rebase, 1);
*ptr = REBASE_OPCODE_DONE;
}
if (mo->binding->data_offset) {
ptr = section_ptr_add(mo->binding, 1);
*ptr = BIND_OPCODE_DONE;
}
if (mo->weak_binding->data_offset) {
ptr = section_ptr_add(mo->weak_binding, 1);
*ptr = BIND_OPCODE_DONE;
}
tcc_free(mo->s_lazy_bind);
tcc_free(mo->s_rebase);
tcc_free(mo->bind);
}
#endif
struct trie_info {
const char *name;
int flag;
addr_t addr;
int str_size;
int term_size;
};
struct trie_node {
int start;
int end;
int index_start;
int index_end;
int n_child;
struct trie_node *child;
};
struct trie_seq {
int n_child;
struct trie_node *node;
int offset;
int nest_offset;
};
static void create_trie(struct trie_node *node,
int from, int to, int index_start,
int n_trie, struct trie_info *trie)
{
int i;
int start, end, index_end;
char cur;
struct trie_node *child;
for (i = from; i < to; i = end) {
cur = trie[i].name[index_start];
start = i++;
for (; i < to; i++)
if (cur != trie[i].name[index_start])
break;
end = i;
if (start == end - 1 ||
(trie[start].name[index_start] &&
trie[start].name[index_start + 1] == 0))
index_end = trie[start].str_size - 1;
else {
index_end = index_start + 1;
for (;;) {
cur = trie[start].name[index_end];
for (i = start + 1; i < end; i++)
if (cur != trie[i].name[index_end])
break;
if (trie[start].name[index_end] &&
trie[start].name[index_end + 1] == 0) {
end = start + 1;
index_end = trie[start].str_size - 1;
break;
}
if (i != end)
break;
index_end++;
}
}
node->child = tcc_realloc(node->child,
(node->n_child + 1) *
sizeof(struct trie_node));
child = &node->child[node->n_child];
child->start = start;
child->end = end;
child->index_start = index_start;
child->index_end = index_end;
child->n_child = 0;
child->child = NULL;
node->n_child++;
if (start != end - 1)
create_trie(child, start, end, index_end, n_trie, trie);
}
}
static int create_seq(int *offset, int *n_seq, struct trie_seq **seq,
struct trie_node *node,
int n_trie, struct trie_info *trie)
{
int i, nest_offset, last_seq = *n_seq, retval = *offset;
struct trie_seq *p_seq;
struct trie_node *p_nest;
for (i = 0; i < node->n_child; i++) {
p_nest = &node->child[i];
*seq = tcc_realloc(*seq, (*n_seq + 1) * sizeof(struct trie_seq));
p_seq = &(*seq)[(*n_seq)++];
p_seq->n_child = i == 0 ? node->n_child : -1;
p_seq->node = p_nest;
p_seq->offset = *offset;
p_seq->nest_offset = 0;
*offset += (i == 0 ? 1 + 1 : 0) +
p_nest->index_end - p_nest->index_start + 1 + 3;
}
for (i = 0; i < node->n_child; i++) {
nest_offset =
create_seq(offset, n_seq, seq, &node->child[i], n_trie, trie);
p_seq = &(*seq)[last_seq + i];
p_seq->nest_offset = nest_offset;
}
return retval;
}
static void node_free(struct trie_node *node)
{
int i;
for (i = 0; i < node->n_child; i++)
node_free(&node->child[i]);
tcc_free(node->child);
}
static int triecmp(const void *_a, const void *_b, void *arg)
{
struct trie_info *a = (struct trie_info *) _a;
struct trie_info *b = (struct trie_info *) _b;
int len_a = strlen(a->name);
int len_b = strlen(b->name);
/* strange sorting needed. Name 'xx' should be after 'xx1' */
if (!strncmp(a->name, b->name, len_a < len_b ? len_a : len_b))
return len_a < len_b ? 1 : (len_a > len_b ? -1 : 0);
return strcmp(a->name, b->name);
}
static void export_trie(TCCState *s1, struct macho *mo)
{
int i, size, offset = 0, save_offset;
uint8_t *ptr;
int sym_index;
int sym_end = symtab_section->data_offset / sizeof(ElfW(Sym));
int n_trie = 0, n_seq = 0;
struct trie_info *trie = NULL, *p_trie;
struct trie_node node, *p_node;
struct trie_seq *seq = NULL;
addr_t vm_addr = get_segment(mo, s1->output_type == TCC_OUTPUT_EXE)->vmaddr;
for (sym_index = 1; sym_index < sym_end; ++sym_index) {
ElfW(Sym) *sym = (ElfW(Sym) *)symtab_section->data + sym_index;
const char *name = (char*)symtab_section->link->data + sym->st_name;
if (sym->st_shndx != SHN_UNDEF && sym->st_shndx < SHN_LORESERVE &&
(ELFW(ST_BIND)(sym->st_info) == STB_GLOBAL ||
ELFW(ST_BIND)(sym->st_info) == STB_WEAK)) {
int flag = EXPORT_SYMBOL_FLAGS_KIND_REGULAR;
addr_t addr =
sym->st_value + s1->sections[sym->st_shndx]->sh_addr - vm_addr;
if (ELFW(ST_BIND)(sym->st_info) == STB_WEAK)
flag |= EXPORT_SYMBOL_FLAGS_WEAK_DEFINITION;
dprintf ("%s %d %llx\n", name, flag, (long long)addr + vm_addr);
trie = tcc_realloc(trie, (n_trie + 1) * sizeof(struct trie_info));
trie[n_trie].name = name;
trie[n_trie].flag = flag;
trie[n_trie].addr = addr;
trie[n_trie].str_size = strlen(name) + 1;
trie[n_trie].term_size = uleb128_size(flag) + uleb128_size(addr);
n_trie++;
}
}
if (n_trie) {
tcc_qsort(trie, n_trie, sizeof(struct trie_info), triecmp, NULL);
memset(&node, 0, sizeof(node));
create_trie(&node, 0, n_trie, 0, n_trie, trie);
create_seq(&offset, &n_seq, &seq, &node, n_trie, trie);
save_offset = offset;
for (i = 0; i < n_seq; i++) {
p_node = seq[i].node;
if (p_node->n_child == 0) {
p_trie = &trie[p_node->start];
seq[i].nest_offset = offset;
offset += 1 + p_trie->term_size + 1;
}
}
for (i = 0; i < n_seq; i++) {
p_node = seq[i].node;
p_trie = &trie[p_node->start];
if (seq[i].n_child >= 0) {
section_ptr_add(mo->exports,
seq[i].offset - mo->exports->data_offset);
ptr = section_ptr_add(mo->exports, 2);
*ptr++ = 0;
*ptr = seq[i].n_child;
}
size = p_node->index_end - p_node->index_start;
ptr = section_ptr_add(mo->exports, size + 1);
memcpy(ptr, &p_trie->name[p_node->index_start], size);
ptr[size] = 0;
write_uleb128(mo->exports, seq[i].nest_offset);
}
section_ptr_add(mo->exports, save_offset - mo->exports->data_offset);
for (i = 0; i < n_seq; i++) {
p_node = seq[i].node;
if (p_node->n_child == 0) {
p_trie = &trie[p_node->start];
write_uleb128(mo->exports, p_trie->term_size);
write_uleb128(mo->exports, p_trie->flag);
write_uleb128(mo->exports, p_trie->addr);
ptr = section_ptr_add(mo->exports, 1);
*ptr = 0;
}
}
section_ptr_add(mo->exports, -mo->exports->data_offset & 7);
node_free(&node);
tcc_free(seq);
}
tcc_free(trie);
}
static void collect_sections(TCCState *s1, struct macho *mo, const char *filename)
{
int i, sk, numsec;
int used_segment[N_SEGMENT];
uint64_t curaddr, fileofs;
Section *s;
struct segment_command_64 *seg;
struct dylib_command *dylib;
#ifdef CONFIG_NEW_MACHO
struct linkedit_data_command *chained_fixups_lc;
struct linkedit_data_command *export_trie_lc;
#endif
struct build_version_command *dyldbv;
struct source_version_command *dyldsv;
struct rpath_command *rpath;
struct dylinker_command *dyldlc;
struct symtab_command *symlc;
struct dysymtab_command *dysymlc;
char *str;
for (i = 0; i < N_SEGMENT; i++)
used_segment[i] = all_segment[i].used;
memset (mo->sk_to_sect, 0, sizeof(mo->sk_to_sect));
for (i = s1->nb_sections; i-- > 1;) {
int type, flags;
s = s1->sections[i];
type = s->sh_type;
flags = s->sh_flags;
sk = sk_unknown;
/* debug sections have sometimes no SHF_ALLOC */
if ((flags & SHF_ALLOC) || !strncmp(s->name, ".debug_", 7)) {
switch (type) {
default: sk = sk_unknown; break;
case SHT_INIT_ARRAY: sk = sk_init; break;
case SHT_FINI_ARRAY: sk = sk_fini; break;
case SHT_NOBITS: sk = sk_bss; break;
case SHT_SYMTAB: sk = sk_discard; break;
case SHT_STRTAB:
if (s == stabstr_section)
sk = sk_stab_str;
else
sk = sk_discard;
break;
case SHT_RELX: sk = sk_discard; break;
case SHT_LINKEDIT: sk = sk_linkedit; break;
case SHT_PROGBITS:
if (s == mo->stubs)
sk = sk_stubs;
#ifndef CONFIG_NEW_MACHO
else if (s == mo->stub_helper)
sk = sk_stub_helper;
else if (s == mo->la_symbol_ptr)
sk = sk_la_ptr;
#endif
else if (s == rodata_section)
sk = sk_ro_data;
else if (s == s1->got)
sk = sk_nl_ptr;
else if (s == stab_section)
sk = sk_stab;
else if (s == dwarf_info_section)
sk = sk_debug_info;
else if (s == dwarf_abbrev_section)
sk = sk_debug_abbrev;
else if (s == dwarf_line_section)
sk = sk_debug_line;
else if (s == dwarf_aranges_section)
sk = sk_debug_aranges;
else if (s == dwarf_str_section)
sk = sk_debug_str;
else if (s == dwarf_line_str_section)
sk = sk_debug_line_str;
else if (flags & SHF_EXECINSTR)
sk = sk_text;
else if (flags & SHF_WRITE)
sk = sk_rw_data;
else
sk = sk_ro_data;
break;
}
} else
sk = sk_discard;
s->prev = mo->sk_to_sect[sk].s;
mo->sk_to_sect[sk].s = s;
used_segment[skinfo[sk].seg_initial] = 1;
}
if (s1->output_type != TCC_OUTPUT_EXE)
used_segment[0] = 0;
for (i = 0; i < N_SEGMENT; i++)
if (used_segment[i]) {
seg = add_segment(mo, all_segment[i].name);
if (i == 1 && s1->output_type != TCC_OUTPUT_EXE)
seg->vmaddr = 0;
else
seg->vmaddr = all_segment[i].vmaddr;
seg->vmsize = all_segment[i].vmsize;
seg->maxprot = all_segment[i].maxprot;
seg->initprot = all_segment[i].initprot;
seg->flags = all_segment[i].flags;
for (sk = sk_unknown; sk < sk_last; sk++)
if (skinfo[sk].seg_initial == i)
mo->segment[sk] = mo->nseg - 1;
}
if (s1->output_type != TCC_OUTPUT_EXE) {
const char *name = s1->install_name ? s1->install_name : filename;
i = (sizeof(*dylib) + strlen(name) + 1 + 7) &-8;
dylib = add_lc(mo, LC_ID_DYLIB, i);
dylib->name = sizeof(*dylib);
dylib->timestamp = 1;
dylib->current_version =
s1->current_version ? s1->current_version : 1 << 16;
dylib->compatibility_version =
s1->compatibility_version ? s1->compatibility_version : 1 << 16;
str = (char*)dylib + dylib->name;
strcpy(str, name);
}
#ifdef CONFIG_NEW_MACHO
chained_fixups_lc = add_lc(mo, LC_DYLD_CHAINED_FIXUPS,
sizeof(struct linkedit_data_command));
export_trie_lc = add_lc(mo, LC_DYLD_EXPORTS_TRIE,
sizeof(struct linkedit_data_command));
#else
mo->dyldinfo = add_lc(mo, LC_DYLD_INFO_ONLY, sizeof(*mo->dyldinfo));
#endif
symlc = add_lc(mo, LC_SYMTAB, sizeof(*symlc));
dysymlc = add_lc(mo, LC_DYSYMTAB, sizeof(*dysymlc));
if (s1->output_type == TCC_OUTPUT_EXE) {
i = (sizeof(*dyldlc) + strlen("/usr/lib/dyld") + 1 + 7) &-8;
dyldlc = add_lc(mo, LC_LOAD_DYLINKER, i);
dyldlc->name = sizeof(*dyldlc);
str = (char*)dyldlc + dyldlc->name;
strcpy(str, "/usr/lib/dyld");
}
dyldbv = add_lc(mo, LC_BUILD_VERSION, sizeof(*dyldbv));
dyldbv->platform = PLATFORM_MACOS;
dyldbv->minos = (10 << 16) + (6 << 8);
dyldbv->sdk = (10 << 16) + (6 << 8);
dyldbv->ntools = 0;
dyldsv = add_lc(mo, LC_SOURCE_VERSION, sizeof(*dyldsv));
dyldsv->version = 0;
if (s1->output_type == TCC_OUTPUT_EXE) {
mo->ep = add_lc(mo, LC_MAIN, sizeof(*mo->ep));
mo->ep->entryoff = 4096;
}
for(i = 0; i < s1->nb_loaded_dlls; i++) {
DLLReference *dllref = s1->loaded_dlls[i];
if (dllref->level == 0)
add_dylib(mo, dllref->name);
}
if (s1->rpath) {
char *path = s1->rpath, *end;
do {
end = strchr(path, ':');
if (!end)
end = strchr(path, 0);
i = (sizeof(*rpath) + (end - path) + 1 + 7) &-8;
rpath = add_lc(mo, LC_RPATH, i);
rpath->path = sizeof(*rpath);
str = (char*)rpath + rpath->path;
memcpy(str, path, end - path);
str[end - path] = 0;
path = end + 1;
} while (*end);
}
fileofs = 4096; /* leave space for mach-o headers */
curaddr = get_segment(mo, s1->output_type == TCC_OUTPUT_EXE)->vmaddr;
curaddr += 4096;
seg = NULL;
numsec = 0;
mo->elfsectomacho = tcc_mallocz(sizeof(*mo->elfsectomacho) * s1->nb_sections);
for (sk = sk_unknown; sk < sk_last; sk++) {
struct section_64 *sec = NULL;
if (seg) {
seg->vmsize = curaddr - seg->vmaddr;
seg->filesize = fileofs - seg->fileoff;
}
#ifdef CONFIG_NEW_MACHO
if (sk == sk_linkedit) {
calc_fixup_size(s1, mo);
export_trie(s1, mo);
}
#else
if (sk == sk_linkedit) {
bind_rebase(s1, mo);
export_trie(s1, mo);
}
#endif
if (skinfo[sk].seg_initial &&
(s1->output_type != TCC_OUTPUT_EXE || mo->segment[sk]) &&
mo->sk_to_sect[sk].s) {
uint64_t al = 0;
int si;
seg = get_segment(mo, mo->segment[sk]);
if (skinfo[sk].name) {
si = add_section(mo, &seg, skinfo[sk].name);
numsec++;
mo->lc[mo->seg2lc[mo->segment[sk]]] = (struct load_command*)seg;
mo->sk_to_sect[sk].machosect = si;
sec = get_section(seg, si);
sec->flags = skinfo[sk].flags;
if (sk == sk_stubs)
#ifdef TCC_TARGET_X86_64
sec->reserved2 = 6;
#elif defined TCC_TARGET_ARM64
sec->reserved2 = 12;
#endif
if (sk == sk_nl_ptr)
sec->reserved1 = mo->nr_plt;
#ifndef CONFIG_NEW_MACHO
if (sk == sk_la_ptr)
sec->reserved1 = mo->nr_plt + mo->n_got;
#endif
}
if (seg->vmaddr == -1) {
curaddr = (curaddr + SEG_PAGE_SIZE - 1) & -SEG_PAGE_SIZE;
seg->vmaddr = curaddr;
fileofs = (fileofs + SEG_PAGE_SIZE - 1) & -SEG_PAGE_SIZE;
seg->fileoff = fileofs;
}
for (s = mo->sk_to_sect[sk].s; s; s = s->prev) {
int a = exact_log2p1(s->sh_addralign);
if (a && al < (a - 1))
al = a - 1;
s->sh_size = s->data_offset;
}
if (sec)
sec->align = al;
al = 1ULL << al;
if (al > 4096)
tcc_warning("alignment > 4096"), sec->align = 12, al = 4096;
curaddr = (curaddr + al - 1) & -al;
fileofs = (fileofs + al - 1) & -al;
if (sec) {
sec->addr = curaddr;
sec->offset = fileofs;
}
for (s = mo->sk_to_sect[sk].s; s; s = s->prev) {
al = s->sh_addralign;
curaddr = (curaddr + al - 1) & -al;
dprintf("%s: curaddr now 0x%lx\n", s->name, (long)curaddr);
s->sh_addr = curaddr;
curaddr += s->sh_size;
if (s->sh_type != SHT_NOBITS) {
fileofs = (fileofs + al - 1) & -al;
s->sh_offset = fileofs;
fileofs += s->sh_size;
dprintf("%s: fileofs now %ld\n", s->name, (long)fileofs);
}
if (sec)
mo->elfsectomacho[s->sh_num] = numsec;
}
if (sec)
sec->size = curaddr - sec->addr;
}
if (DEBUG_MACHO)
for (s = mo->sk_to_sect[sk].s; s; s = s->prev) {
int type = s->sh_type;
int flags = s->sh_flags;
printf("%d section %-16s %-10s %09lx %04x %02d %s,%s,%s\n",
sk,
s->name,
type == SHT_PROGBITS ? "progbits" :
type == SHT_NOBITS ? "nobits" :
type == SHT_SYMTAB ? "symtab" :
type == SHT_STRTAB ? "strtab" :
type == SHT_INIT_ARRAY ? "init" :
type == SHT_FINI_ARRAY ? "fini" :
type == SHT_RELX ? "rel" : "???",
(long)s->sh_addr,
(unsigned)s->data_offset,
s->sh_addralign,
flags & SHF_ALLOC ? "alloc" : "",
flags & SHF_WRITE ? "write" : "",
flags & SHF_EXECINSTR ? "exec" : ""
);
}
}
if (seg) {
seg->vmsize = curaddr - seg->vmaddr;
seg->filesize = fileofs - seg->fileoff;
}
/* Fill symtab info */
symlc->symoff = mo->symtab->sh_offset;
symlc->nsyms = mo->symtab->data_offset / sizeof(struct nlist_64);
symlc->stroff = mo->strtab->sh_offset;
symlc->strsize = mo->strtab->data_offset;
dysymlc->iundefsym = mo->iundef == -1 ? symlc->nsyms : mo->iundef;
dysymlc->iextdefsym = mo->iextdef == -1 ? dysymlc->iundefsym : mo->iextdef;
dysymlc->ilocalsym = mo->ilocal == -1 ? dysymlc->iextdefsym : mo->ilocal;
dysymlc->nlocalsym = dysymlc->iextdefsym - dysymlc->ilocalsym;
dysymlc->nextdefsym = dysymlc->iundefsym - dysymlc->iextdefsym;
dysymlc->nundefsym = symlc->nsyms - dysymlc->iundefsym;
dysymlc->indirectsymoff = mo->indirsyms->sh_offset;
dysymlc->nindirectsyms = mo->indirsyms->data_offset / sizeof(uint32_t);
#ifdef CONFIG_NEW_MACHO
if (mo->chained_fixups->data_offset) {
chained_fixups_lc->dataoff = mo->chained_fixups->sh_offset;
chained_fixups_lc->datasize = mo->chained_fixups->data_offset;
}
if (mo->exports->data_offset) {
export_trie_lc->dataoff = mo->exports->sh_offset;
export_trie_lc->datasize = mo->exports->data_offset;
}
#else
if (mo->rebase->data_offset) {
mo->dyldinfo->rebase_off = mo->rebase->sh_offset;
mo->dyldinfo->rebase_size = mo->rebase->data_offset;
}
if (mo->binding->data_offset) {
mo->dyldinfo->bind_off = mo->binding->sh_offset;
mo->dyldinfo->bind_size = mo->binding->data_offset;
}
if (mo->weak_binding->data_offset) {
mo->dyldinfo->weak_bind_off = mo->weak_binding->sh_offset;
mo->dyldinfo->weak_bind_size = mo->weak_binding->data_offset;
}
if (mo->lazy_binding->data_offset) {
mo->dyldinfo->lazy_bind_off = mo->lazy_binding->sh_offset;
mo->dyldinfo->lazy_bind_size = mo->lazy_binding->data_offset;
}
if (mo->exports->data_offset) {
mo->dyldinfo->export_off = mo->exports->sh_offset;
mo->dyldinfo->export_size = mo->exports->data_offset;
}
#endif
}
static void macho_write(TCCState *s1, struct macho *mo, FILE *fp)
{
int i, sk;
uint64_t fileofs = 0;
Section *s;
mo->mh.mh.magic = MH_MAGIC_64;
#ifdef TCC_TARGET_X86_64
mo->mh.mh.cputype = CPU_TYPE_X86_64;
mo->mh.mh.cpusubtype = CPU_SUBTYPE_LIB64 | CPU_SUBTYPE_X86_ALL;
#elif defined TCC_TARGET_ARM64
mo->mh.mh.cputype = CPU_TYPE_ARM64;
mo->mh.mh.cpusubtype = CPU_SUBTYPE_ARM64_ALL;
#endif
if (s1->output_type == TCC_OUTPUT_EXE) {
mo->mh.mh.filetype = MH_EXECUTE;
mo->mh.mh.flags = MH_DYLDLINK | MH_PIE;
}
else {
mo->mh.mh.filetype = MH_DYLIB;
mo->mh.mh.flags = MH_DYLDLINK;
}
mo->mh.mh.ncmds = mo->nlc;
mo->mh.mh.sizeofcmds = 0;
for (i = 0; i < mo->nlc; i++)
mo->mh.mh.sizeofcmds += mo->lc[i]->cmdsize;
fwrite(&mo->mh, 1, sizeof(mo->mh), fp);
fileofs += sizeof(mo->mh);
for (i = 0; i < mo->nlc; i++) {
fwrite(mo->lc[i], 1, mo->lc[i]->cmdsize, fp);
fileofs += mo->lc[i]->cmdsize;
}
for (sk = sk_unknown; sk < sk_last; sk++) {
//struct segment_command_64 *seg;
if (skinfo[sk].seg_initial == 0 ||
(s1->output_type == TCC_OUTPUT_EXE && !mo->segment[sk]) ||
!mo->sk_to_sect[sk].s)
continue;
/*seg =*/ get_segment(mo, mo->segment[sk]);
for (s = mo->sk_to_sect[sk].s; s; s = s->prev) {
if (s->sh_type != SHT_NOBITS) {
while (fileofs < s->sh_offset)
fputc(0, fp), fileofs++;
if (s->sh_size) {
fwrite(s->data, 1, s->sh_size, fp);
fileofs += s->sh_size;
}
}
}
}
}
#ifdef CONFIG_NEW_MACHO
static int bind_rebase_cmp(const void *_a, const void *_b, void *arg)
{
TCCState *s1 = arg;
struct bind_rebase *a = (struct bind_rebase *) _a;
struct bind_rebase *b = (struct bind_rebase *) _b;
addr_t aa = s1->sections[a->section]->sh_addr + a->rel.r_offset;
addr_t ab = s1->sections[b->section]->sh_addr + b->rel.r_offset;
return aa > ab ? 1 : aa < ab ? -1 : 0;
}
ST_FUNC void bind_rebase_import(TCCState *s1, struct macho *mo)
{
int i, j, k, bind_index, size, page_count, sym_index;
const char *name;
ElfW(Sym) *sym;
unsigned char *data = mo->chained_fixups->data;
struct segment_command_64 *seg;
struct dyld_chained_fixups_header *header;
struct dyld_chained_starts_in_image *image;
struct dyld_chained_starts_in_segment *segment;
struct dyld_chained_import *import;
tcc_qsort(mo->bind_rebase, mo->n_bind_rebase, sizeof(struct bind_rebase),
bind_rebase_cmp, s1);
for (i = 0; i < mo->n_bind_rebase - 1; i++)
if (mo->bind_rebase[i].section == mo->bind_rebase[i + 1].section &&
mo->bind_rebase[i].rel.r_offset == mo->bind_rebase[i + 1].rel.r_offset) {
sym_index = ELFW(R_SYM)(mo->bind_rebase[i].rel.r_info);
sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
name = (char *) symtab_section->link->data + sym->st_name;
tcc_error("Overlap %s/%s %s:%s",
mo->bind_rebase[i].bind ? "bind" : "rebase",
mo->bind_rebase[i + 1].bind ? "bind" : "rebase",
s1->sections[mo->bind_rebase[i].section]->name, name);
}
header = (struct dyld_chained_fixups_header *) data;
data += (sizeof(struct dyld_chained_fixups_header) + 7) & -8;
header->starts_offset = data - mo->chained_fixups->data;
header->imports_count = mo->n_bind;
header->imports_format = DYLD_CHAINED_IMPORT;
header->symbols_format = 0;
size = sizeof(struct dyld_chained_starts_in_image) +
(mo->nseg - 1) * sizeof(uint32_t);
image = (struct dyld_chained_starts_in_image *) data;
data += (size + 7) & -8;
image->seg_count = mo->nseg;
for (i = (s1->output_type == TCC_OUTPUT_EXE); i < mo->nseg - 1; i++) {
image->seg_info_offset[i] = (data - mo->chained_fixups->data) -
header->starts_offset;
seg = get_segment(mo, i);
page_count = (seg->vmsize + SEG_PAGE_SIZE - 1) / SEG_PAGE_SIZE;
size = sizeof(struct dyld_chained_starts_in_segment) +
(page_count - 1) * sizeof(uint16_t);
segment = (struct dyld_chained_starts_in_segment *) data;
data += (size + 7) & -8;
segment->size = size;
segment->page_size = SEG_PAGE_SIZE;
#if 1
#define PTR_64_OFFSET 0
#define PTR_64_MASK 0x7FFFFFFFFFFULL
segment->pointer_format = DYLD_CHAINED_PTR_64;
#else
#define PTR_64_OFFSET 0x100000000ULL
#define PTR_64_MASK 0xFFFFFFFFFFFFFFULL
segment->pointer_format = DYLD_CHAINED_PTR_64_OFFSET;
#endif
segment->segment_offset = seg->fileoff;
segment->max_valid_pointer = 0;
segment->page_count = page_count;
// add bind/rebase
bind_index = 0;
k = 0;
for (j = 0; j < page_count; j++) {
addr_t start = seg->vmaddr + j * SEG_PAGE_SIZE;
addr_t end = start + SEG_PAGE_SIZE;
void *last = NULL;
addr_t last_o = 0;
addr_t cur_o, cur;
struct dyld_chained_ptr_64_rebase *rebase;
struct dyld_chained_ptr_64_bind *bind;
segment->page_start[j] = DYLD_CHAINED_PTR_START_NONE;
for (; k < mo->n_bind_rebase; k++) {
Section *s = s1->sections[mo->bind_rebase[k].section];
addr_t r_offset = mo->bind_rebase[k].rel.r_offset;
addr_t addr = s->sh_addr + r_offset;
if ((addr & 3) ||
(addr & (SEG_PAGE_SIZE - 1)) > SEG_PAGE_SIZE - PTR_SIZE)
tcc_error("Illegal rel_offset %s %lld",
s->name, (long long)r_offset);
if (addr >= end)
break;
if (addr >= start) {
cur_o = addr - start;
if (mo->bind_rebase[k].bind) {
if (segment->page_start[j] == DYLD_CHAINED_PTR_START_NONE)
segment->page_start[j] = cur_o;
else {
bind = (struct dyld_chained_ptr_64_bind *) last;
bind->next = (cur_o - last_o) / 4;
}
bind = (struct dyld_chained_ptr_64_bind *)
(s->data + r_offset);
last = bind;
last_o = cur_o;
bind->ordinal = bind_index;
bind->addend = 0;
bind->reserved = 0;
bind->next = 0;
bind->bind = 1;
}
else {
if (segment->page_start[j] == DYLD_CHAINED_PTR_START_NONE)
segment->page_start[j] = cur_o;
else {
rebase = (struct dyld_chained_ptr_64_rebase *) last;
rebase->next = (cur_o - last_o) / 4;
}
rebase = (struct dyld_chained_ptr_64_rebase *)
(s->data + r_offset);
last = rebase;
last_o = cur_o;
cur = (*(uint64_t *) (s->data + r_offset)) -
PTR_64_OFFSET;
rebase->target = cur & PTR_64_MASK;
rebase->high8 = cur >> (64 - 8);
if (cur != ((uint64_t)rebase->high8 << (64 - 8)) + rebase->target)
tcc_error("rebase error");
rebase->reserved = 0;
rebase->next = 0;
rebase->bind = 0;
}
}
bind_index += mo->bind_rebase[k].bind;
}
}
}
// add imports
header->imports_offset = data - mo->chained_fixups->data;
import = (struct dyld_chained_import *) data;
data += mo->n_bind * sizeof (struct dyld_chained_import);
header->symbols_offset = data - mo->chained_fixups->data;
data++;
for (i = 0, bind_index = 0; i < mo->n_bind_rebase; i++) {
if (mo->bind_rebase[i].bind) {
import[bind_index].lib_ordinal =
BIND_SPECIAL_DYLIB_FLAT_LOOKUP & 0xffu;
import[bind_index].name_offset =
(data - mo->chained_fixups->data) - header->symbols_offset;
sym_index = ELFW(R_SYM)(mo->bind_rebase[i].rel.r_info);
sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
import[bind_index].weak_import =
ELFW(ST_BIND)(sym->st_info) == STB_WEAK;
name = (char *) symtab_section->link->data + sym->st_name;
strcpy((char *) data, name);
data += strlen(name) + 1;
bind_index++;
}
}
tcc_free(mo->bind_rebase);
}
#endif
ST_FUNC int macho_output_file(TCCState *s1, const char *filename)
{
int fd, mode, file_type;
FILE *fp;
int i, ret = -1;
struct macho mo;
(void)memset(&mo, 0, sizeof(mo));
file_type = s1->output_type;
if (file_type == TCC_OUTPUT_OBJ)
mode = 0666;
else
mode = 0777;
unlink(filename);
fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, mode);
if (fd < 0 || (fp = fdopen(fd, "wb")) == NULL) {
tcc_error_noabort("could not write '%s: %s'", filename, strerror(errno));
return -1;
}
if (s1->verbose)
printf("<- %s\n", filename);
tcc_add_runtime(s1);
tcc_macho_add_destructor(s1);
resolve_common_syms(s1);
create_symtab(s1, &mo);
check_relocs(s1, &mo);
ret = check_symbols(s1, &mo);
if (!ret) {
int save_output = s1->output_type;
collect_sections(s1, &mo, filename);
relocate_syms(s1, s1->symtab, 0);
if (s1->output_type == TCC_OUTPUT_EXE)
mo.ep->entryoff = get_sym_addr(s1, "main", 1, 1)
- get_segment(&mo, 1)->vmaddr;
if (s1->nb_errors)
goto do_ret;
// Macho uses bind/rebase instead of dynsym
s1->output_type = TCC_OUTPUT_EXE;
relocate_sections(s1);
s1->output_type = save_output;
#ifdef CONFIG_NEW_MACHO
bind_rebase_import(s1, &mo);
#endif
convert_symbols(s1, &mo);
macho_write(s1, &mo, fp);
}
do_ret:
for (i = 0; i < mo.nlc; i++)
tcc_free(mo.lc[i]);
tcc_free(mo.seg2lc);
tcc_free(mo.lc);
tcc_free(mo.elfsectomacho);
tcc_free(mo.e2msym);
fclose(fp);
#ifdef CONFIG_CODESIGN
{
char command[1024];
int retval;
snprintf(command, sizeof(command), "codesign -f -s - %s", filename);
retval = system (command);
if (retval == -1 || !(WIFEXITED(retval) && WEXITSTATUS(retval) == 0))
tcc_error ("command failed '%s'", command);
}
#endif
return ret;
}
static uint32_t macho_swap32(uint32_t x)
{
return (x >> 24) | (x << 24) | ((x >> 8) & 0xff00) | ((x & 0xff00) << 8);
}
#define SWAP(x) (swap ? macho_swap32(x) : (x))
#define tbd_parse_movepast(s) \
(pos = (pos = strstr(pos, s)) ? pos + strlen(s) : NULL)
#define tbd_parse_movetoany(cs) (pos = strpbrk(pos, cs))
#define tbd_parse_skipws while (*pos && (*pos==' '||*pos=='\n')) ++pos
#define tbd_parse_tramplequote if(*pos=='\''||*pos=='"') tbd_parse_trample
#define tbd_parse_tramplespace if(*pos==' ') tbd_parse_trample
#define tbd_parse_trample *pos++=0
#ifdef TCC_IS_NATIVE
/* Looks for the active developer SDK set by xcode-select (or the default
one set during installation.) */
ST_FUNC void tcc_add_macos_sdkpath(TCCState* s)
{
char *sdkroot = NULL, *pos = NULL;
void* xcs = dlopen("libxcselect.dylib", RTLD_GLOBAL | RTLD_LAZY);
CString path;
int (*f)(unsigned int, char**) = dlsym(xcs, "xcselect_host_sdk_path");
cstr_new(&path);
if (f) f(1, &sdkroot);
if (sdkroot)
pos = strstr(sdkroot,"SDKs/MacOSX");
if (pos)
cstr_printf(&path, "%.*s.sdk/usr/lib", (int)(pos - sdkroot + 11), sdkroot);
/* must use free from libc directly */
#pragma push_macro("free")
#undef free
free(sdkroot);
#pragma pop_macro("free")
if (path.size)
tcc_add_library_path(s, (char*)path.data);
else
tcc_add_library_path(s,
"/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/lib"
":" "/Applications/Xcode.app/Developer/SDKs/MacOSX.sdk/usr/lib"
);
cstr_free(&path);
}
ST_FUNC const char* macho_tbd_soname(const char* filename) {
char *soname, *data, *pos;
const char *ret = filename;
int fd = open(filename,O_RDONLY);
if (fd<0) return ret;
pos = data = tcc_load_text(fd);
if (!tbd_parse_movepast("install-name: ")) goto the_end;
tbd_parse_skipws;
tbd_parse_tramplequote;
soname = pos;
if (!tbd_parse_movetoany("\n \"'")) goto the_end;
tbd_parse_trample;
ret = tcc_strdup(soname);
the_end:
tcc_free(data);
return ret;
}
#endif /* TCC_IS_NATIVE */
ST_FUNC int macho_load_tbd(TCCState* s1, int fd, const char* filename, int lev)
{
char *soname, *data, *pos;
int ret = -1;
pos = data = tcc_load_text(fd);
if (!tbd_parse_movepast("install-name: ")) goto the_end;
tbd_parse_skipws;
tbd_parse_tramplequote;
soname = pos;
if (!tbd_parse_movetoany("\n \"'")) goto the_end;
tbd_parse_trample;
ret = 0;
if (tcc_add_dllref(s1, soname, lev)->found)
goto the_end;
while(pos) {
char* sym = NULL;
int cont = 1;
if (!tbd_parse_movepast("symbols: ")) break;
if (!tbd_parse_movepast("[")) break;
while (cont) {
tbd_parse_skipws;
tbd_parse_tramplequote;
sym = pos;
if (!tbd_parse_movetoany(",] \"'")) break;
tbd_parse_tramplequote;
tbd_parse_tramplespace;
tbd_parse_skipws;
if (*pos==0||*pos==']') cont=0;
tbd_parse_trample;
set_elf_sym(s1->dynsymtab_section, 0, 0,
ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0, SHN_UNDEF, sym);
}
}
the_end:
tcc_free(data);
return ret;
}
ST_FUNC int macho_load_dll(TCCState * s1, int fd, const char* filename, int lev)
{
unsigned char buf[sizeof(struct mach_header_64)];
void *buf2;
uint32_t machofs = 0;
struct fat_header fh;
struct mach_header mh;
struct load_command *lc;
int i, swap = 0;
const char *soname = filename;
struct nlist_64 *symtab = 0;
uint32_t nsyms = 0;
char *strtab = 0;
uint32_t strsize = 0;
uint32_t iextdef = 0;
uint32_t nextdef = 0;
again:
if (full_read(fd, buf, sizeof(buf)) != sizeof(buf))
return -1;
memcpy(&fh, buf, sizeof(fh));
if (fh.magic == FAT_MAGIC || fh.magic == FAT_CIGAM) {
struct fat_arch *fa = load_data(fd, sizeof(fh),
fh.nfat_arch * sizeof(*fa));
swap = fh.magic == FAT_CIGAM;
for (i = 0; i < SWAP(fh.nfat_arch); i++)
#ifdef TCC_TARGET_X86_64
if (SWAP(fa[i].cputype) == CPU_TYPE_X86_64
&& SWAP(fa[i].cpusubtype) == CPU_SUBTYPE_X86_ALL)
#elif defined TCC_TARGET_ARM64
if (SWAP(fa[i].cputype) == CPU_TYPE_ARM64
&& SWAP(fa[i].cpusubtype) == CPU_SUBTYPE_ARM64_ALL)
#endif
break;
if (i == SWAP(fh.nfat_arch)) {
tcc_free(fa);
return -1;
}
machofs = SWAP(fa[i].offset);
tcc_free(fa);
lseek(fd, machofs, SEEK_SET);
goto again;
} else if (fh.magic == FAT_MAGIC_64 || fh.magic == FAT_CIGAM_64) {
tcc_warning("%s: Mach-O fat 64bit files of type 0x%x not handled",
filename, fh.magic);
return -1;
}
memcpy(&mh, buf, sizeof(mh));
if (mh.magic != MH_MAGIC_64)
return -1;
dprintf("found Mach-O at %d\n", machofs);
buf2 = load_data(fd, machofs + sizeof(struct mach_header_64), mh.sizeofcmds);
for (i = 0, lc = buf2; i < mh.ncmds; i++) {
dprintf("lc %2d: 0x%08x\n", i, lc->cmd);
switch (lc->cmd) {
case LC_SYMTAB:
{
struct symtab_command *sc = (struct symtab_command*)lc;
nsyms = sc->nsyms;
symtab = load_data(fd, machofs + sc->symoff, nsyms * sizeof(*symtab));
strsize = sc->strsize;
strtab = load_data(fd, machofs + sc->stroff, strsize);
break;
}
case LC_ID_DYLIB:
{
struct dylib_command *dc = (struct dylib_command*)lc;
soname = (char*)lc + dc->name;
dprintf(" ID_DYLIB %d 0x%x 0x%x %s\n",
dc->timestamp, dc->current_version,
dc->compatibility_version, soname);
break;
}
case LC_REEXPORT_DYLIB:
{
struct dylib_command *dc = (struct dylib_command*)lc;
char *name = (char*)lc + dc->name;
int subfd = open(name, O_RDONLY | O_BINARY);
dprintf(" REEXPORT %s\n", name);
if (subfd < 0)
tcc_warning("can't open %s (reexported from %s)", name, filename);
else {
/* Hopefully the REEXPORTs never form a cycle, we don't check
for that! */
macho_load_dll(s1, subfd, name, lev + 1);
close(subfd);
}
break;
}
case LC_DYSYMTAB:
{
struct dysymtab_command *dc = (struct dysymtab_command*)lc;
iextdef = dc->iextdefsym;
nextdef = dc->nextdefsym;
break;
}
}
lc = (struct load_command*) ((char*)lc + lc->cmdsize);
}
if (tcc_add_dllref(s1, soname, lev)->found)
goto the_end;
if (!nsyms || !nextdef)
tcc_warning("%s doesn't export any symbols?", filename);
//dprintf("symbols (all):\n");
dprintf("symbols (exported):\n");
dprintf(" n: typ sec desc value name\n");
//for (i = 0; i < nsyms; i++) {
for (i = iextdef; i < iextdef + nextdef; i++) {
struct nlist_64 *sym = symtab + i;
dprintf("%5d: %3d %3d 0x%04x 0x%016lx %s\n",
i, sym->n_type, sym->n_sect, sym->n_desc, (long)sym->n_value,
strtab + sym->n_strx);
set_elf_sym(s1->dynsymtab_section, 0, 0,
ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE),
0, SHN_UNDEF, strtab + sym->n_strx);
}
the_end:
tcc_free(strtab);
tcc_free(symtab);
tcc_free(buf2);
return 0;
}