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/* LTO routines for Mach-O object files.
Copyright 2010 Free Software Foundation, Inc.
Contributed by Steven Bosscher.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC 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 General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#ifndef LTO_MACH_O_H
#define LTO_MACH_O_H
/* On-disk file structures. */
/* Mach-O header (32 bits version). */
struct mach_o_header_32
{
unsigned char magic[4]; /* Magic number. */
unsigned char cputype[4]; /* CPU that this object is for. */
unsigned char cpusubtype[4]; /* CPU subtype. */
unsigned char filetype[4]; /* Type of file. */
unsigned char ncmds[4]; /* Number of load commands. */
unsigned char sizeofcmds[4]; /* Total size of load commands. */
unsigned char flags[4]; /* Flags for special featues. */
};
typedef struct mach_o_header_32 mach_o_header_32;
/* Mach-O header (64 bits version). */
struct mach_o_header_64
{
unsigned char magic[4]; /* Magic number. */
unsigned char cputype[4]; /* CPU that this object is for. */
unsigned char cpusubtype[4]; /* CPU subtype. */
unsigned char filetype[4]; /* Type of file. */
unsigned char ncmds[4]; /* Number of load commands. */
unsigned char sizeofcmds[4]; /* Total size of load commands. */
unsigned char flags[4]; /* Flags for special featues. */
unsigned char reserved[4]; /* Reserved. Duh. */
};
typedef struct mach_o_header_64 mach_o_header_64;
/* Magic number. */
#define MACH_O_MH_MAGIC 0xfeedface
#define MACH_O_MH_CIGAM 0xcefaedfe
#define MACH_O_MH_MAGIC_64 0xfeedfacf
#define MACH_O_MH_CIGAM_64 0xcffaedfe
/* Supported CPU types. */
#define MACH_O_CPU_TYPE_I386 7
#define MACH_O_CPU_TYPE_X86_64 7 + 0x1000000
#define MACH_O_CPU_TYPE_POWERPC 18
#define MACH_O_CPU_TYPE_POWERPC_64 18 + 0x1000000
/* Supported file types. */
#define MACH_O_MH_OBJECT 0x01
/* Mach-O load command data structure. */
struct mach_o_load_command
{
unsigned char cmd[4]; /* The type of load command. */
unsigned char cmdsize[4]; /* Size in bytes of load command data structure. */
};
typedef struct mach_o_load_command mach_o_load_command;
/* Supported load commands. We support only the segment load commands. */
#define MACH_O_LC_SEGMENT 0x01
#define MACH_O_LC_SEGMENT_64 0x19
/* LC_SEGMENT load command. */
struct mach_o_segment_command_32
{
unsigned char cmd[4]; /* The type of load command (LC_SEGMENT). */
unsigned char cmdsize[4]; /* Size in bytes of load command data structure. */
unsigned char segname[16]; /* Name of this segment. */
unsigned char vmaddr[4]; /* Virtual memory address of this segment. */
unsigned char vmsize[4]; /* Size there, in bytes. */
unsigned char fileoff[4]; /* Offset in bytes of the data to be mapped. */
unsigned char filesize[4]; /* Size in bytes on disk. */
unsigned char maxprot[4]; /* Maximum permitted vmem protection. */
unsigned char initprot[4]; /* Initial vmem protection. */
unsigned char nsects[4]; /* Number of sections in this segment. */
unsigned char flags[4]; /* Flags that affect the loading. */
};
typedef struct mach_o_segment_command_32 mach_o_segment_command_32;
/* LC_SEGMENT_64 load command. Only nsects matters for us, really. */
struct mach_o_segment_command_64
{
unsigned char cmd[4]; /* The type of load command (LC_SEGMENT_64). */
unsigned char cmdsize[4]; /* Size in bytes of load command data structure. */
unsigned char segname[16]; /* Name of this segment. */
unsigned char vmaddr[8]; /* Virtual memory address of this segment. */
unsigned char vmsize[8]; /* Size there, in bytes. */
unsigned char fileoff[8]; /* Offset in bytes of the data to be mapped. */
unsigned char filesize[8]; /* Size in bytes on disk. */
unsigned char maxprot[4]; /* Maximum permitted vmem protection. */
unsigned char initprot[4]; /* Initial vmem protection. */
unsigned char nsects[4]; /* Number of sections in this segment. */
unsigned char flags[4]; /* Flags that affect the loading. */
};
typedef struct mach_o_segment_command_64 mach_o_segment_command_64;
/* A Mach-O 32-bits section. */
struct mach_o_section_32
{
unsigned char sectname[16]; /* Section name. */
unsigned char segname[16]; /* Segment that the section belongs to. */
unsigned char addr[4]; /* Address of this section in memory. */
unsigned char size[4]; /* Size in bytes of this section. */
unsigned char offset[4]; /* File offset of this section. */
unsigned char align[4]; /* log2 of this section's alignment. */
unsigned char reloff[4]; /* File offset of this section's relocs. */
unsigned char nreloc[4]; /* Number of relocs for this section. */
unsigned char flags[4]; /* Section flags/attributes. */
unsigned char reserved1[4];
unsigned char reserved2[4];
};
typedef struct mach_o_section_32 mach_o_section_32;
/* A Mach-O 64-bits section. */
struct mach_o_section_64
{
unsigned char sectname[16]; /* Section name. */
unsigned char segname[16]; /* Segment that the section belongs to. */
unsigned char addr[8]; /* Address of this section in memory. */
unsigned char size[8]; /* Size in bytes of this section. */
unsigned char offset[4]; /* File offset of this section. */
unsigned char align[4]; /* log2 of this section's alignment. */
unsigned char reloff[4]; /* File offset of this section's relocs. */
unsigned char nreloc[4]; /* Number of relocs for this section. */
unsigned char flags[4]; /* Section flags/attributes. */
unsigned char reserved1[4];
unsigned char reserved2[4];
unsigned char reserved3[4];
};
typedef struct mach_o_section_64 mach_o_section_64;
/* Flags for Mach-O sections. LTO sections are marked with S_ATTR_DEBUG
to instruct the linker to ignore the sections. */
#define MACH_O_S_ATTR_DEBUG 0x02000000
/* In-memory file structures. */
/* Section data in output files is made of these. */
struct lto_mach_o_data_d
{
/* Pointer to data block. */
void *d_buf;
/* Size of data block. */
ssize_t d_size;
/* Next data block for this section. */
struct lto_mach_o_data_d *next;
};
typedef struct lto_mach_o_data_d *lto_mach_o_data;
/* This struct tracks the data for a section. */
struct lto_mach_o_section_d
{
/* Singly-linked list of section's data blocks. */
lto_mach_o_data data_chain;
/* Offset in string table of the section name. */
size_t strtab_offs;
/* Section name. */
const char *name;
/* Number of trailing padding bytes needed. */
ssize_t pad_needed;
/* Raw section header data. */
size_t section_size;
union {
struct {
char sectname[16];
char segname[16];
} section;
mach_o_section_32 section_32;
mach_o_section_64 section_64;
} u;
/* Next section for this file. */
struct lto_mach_o_section_d *next;
};
typedef struct lto_mach_o_section_d *lto_mach_o_section;
DEF_VEC_P (lto_mach_o_section);
DEF_VEC_ALLOC_P (lto_mach_o_section, heap);
/* A Mach-O file. */
struct lto_mach_o_file_d
{
/* The base information. */
lto_file base;
/* Common file members: */
/* The system file descriptor for the file. */
int fd;
/* The file's overall header. */
union {
/* We make use here of the fact that section_32 and section_64
have the same layout (except for section_64.reserved3). We
read the struct of proper size, but only address the first
member of this union. */
mach_o_header_64 header;
mach_o_header_32 header_32;
mach_o_header_64 header_64;
} u;
/* All sections in a varray. */
VEC(lto_mach_o_section, heap) *section_vec;
/* Readable file members: */
/* File total size. */
off_t file_size;
/* True if this file is open for writing. */
bool writable;
/* Section containing the __section_names section. */
lto_mach_o_section section_names_section;
/* Writable file members: */
/* The currently active section. */
lto_mach_o_section scn;
/* Linked list of data which must be freed *after* the file has been
closed. This is an annoying limitation of libelf. Which has been
faithfully reproduced here. */
struct lto_char_ptr_base *data;
};
typedef struct lto_mach_o_file_d lto_mach_o_file;
#endif /* LTO_MACH_O_H */
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