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simple-object-mach-o.c
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/* simple-object-mach-o.c -- routines to manipulate Mach-O object files.
Copyright (C) 2010-2025 Free Software Foundation, Inc.
Written by Ian Lance Taylor, Google.
This program 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 2, or (at your option) any
later version.
This program 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 this program; if not, write to the Free Software
Foundation, 51 Franklin Street - Fifth Floor,
Boston, MA 02110-1301, USA. */
#include "config.h"
#include "libiberty.h"
#include "simple-object.h"
#include <stddef.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STDINT_H
#include <stdint.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_INTTYPES_H
#include <inttypes.h>
#endif
#include "simple-object-common.h"
/* Mach-O structures and constants. */
/* Mach-O header (32-bit 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. */
};
/* Mach-O header (64-bit 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. */
};
/* For magic field in header. */
#define MACH_O_MH_MAGIC 0xfeedface
#define MACH_O_MH_MAGIC_64 0xfeedfacf
/* For filetype field in header. */
#define MACH_O_MH_OBJECT 0x01
/* A Mach-O file is a list of load commands. This is the header of a
load command. */
struct mach_o_load_command
{
unsigned char cmd[4]; /* The type of load command. */
unsigned char cmdsize[4]; /* Size in bytes of entire command. */
};
/* For cmd field in load command. */
#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 entire command. */
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. */
};
/* LC_SEGMENT_64 load command. */
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 entire command. */
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. */
};
/* 32-bit section header. */
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];
};
/* 64-bit section header. */
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];
};
/* Flags for Mach-O sections. */
#define MACH_O_S_ATTR_DEBUG 0x02000000
/* The length of a segment or section name. */
#define MACH_O_NAME_LEN (16)
/* A GNU specific extension for long section names. */
#define GNU_SECTION_NAMES "__section_names"
/* A GNU-specific extension to wrap multiple sections using three
mach-o sections within a given segment. The section '__wrapper_sects'
is subdivided according to the index '__wrapper_index' and each sub
sect is named according to the names supplied in '__wrapper_names'. */
#define GNU_WRAPPER_SECTS "__wrapper_sects"
#define GNU_WRAPPER_INDEX "__wrapper_index"
#define GNU_WRAPPER_NAMES "__wrapper_names"
/* Private data for an simple_object_read. */
struct simple_object_mach_o_read
{
/* User specified segment name. */
char *segment_name;
/* Magic number. */
unsigned int magic;
/* Whether this file is big-endian. */
int is_big_endian;
/* CPU type from header. */
unsigned int cputype;
/* CPU subtype from header. */
unsigned int cpusubtype;
/* Number of commands, from header. */
unsigned int ncmds;
/* Flags from header. */
unsigned int flags;
/* Reserved field from header, only used on 64-bit. */
unsigned int reserved;
};
/* Private data for an simple_object_attributes. */
struct simple_object_mach_o_attributes
{
/* Magic number. */
unsigned int magic;
/* Whether this file is big-endian. */
int is_big_endian;
/* CPU type from header. */
unsigned int cputype;
/* CPU subtype from header. */
unsigned int cpusubtype;
/* Flags from header. */
unsigned int flags;
/* Reserved field from header, only used on 64-bit. */
unsigned int reserved;
};
/* See if we have a Mach-O MH_OBJECT file:
A standard MH_OBJECT (from as) will have three load commands:
0 - LC_SEGMENT/LC_SEGMENT64
1 - LC_SYMTAB
2 - LC_DYSYMTAB
The LC_SEGMENT/LC_SEGMENT64 will introduce a single anonymous segment
containing all the sections.
Files written by simple-object will have only the segment command
(no symbol tables). */
static void *
simple_object_mach_o_match (
unsigned char header[SIMPLE_OBJECT_MATCH_HEADER_LEN],
int descriptor,
off_t offset,
const char *segment_name,
const char **errmsg,
int *err)
{
unsigned int magic;
int is_big_endian;
unsigned int (*fetch_32) (const unsigned char *);
unsigned int filetype;
struct simple_object_mach_o_read *omr;
unsigned char buf[sizeof (struct mach_o_header_64)];
unsigned char *b;
magic = simple_object_fetch_big_32 (header);
if (magic == MACH_O_MH_MAGIC || magic == MACH_O_MH_MAGIC_64)
is_big_endian = 1;
else
{
magic = simple_object_fetch_little_32 (header);
if (magic == MACH_O_MH_MAGIC || magic == MACH_O_MH_MAGIC_64)
is_big_endian = 0;
else
{
*errmsg = NULL;
*err = 0;
return NULL;
}
}
#ifndef UNSIGNED_64BIT_TYPE
if (magic == MACH_O_MH_MAGIC_64)
{
*errmsg = "64-bit Mach-O objects not supported";
*err = 0;
return NULL;
}
#endif
/* We require the user to provide a segment name. This is
unfortunate but I don't see any good choices here. */
if (segment_name == NULL)
{
*errmsg = "Mach-O file found but no segment name specified";
*err = 0;
return NULL;
}
if (strlen (segment_name) > MACH_O_NAME_LEN)
{
*errmsg = "Mach-O segment name too long";
*err = 0;
return NULL;
}
/* The 32-bit and 64-bit headers are similar enough that we can use
the same code. */
fetch_32 = (is_big_endian
? simple_object_fetch_big_32
: simple_object_fetch_little_32);
if (!simple_object_internal_read (descriptor, offset, buf,
(magic == MACH_O_MH_MAGIC
? sizeof (struct mach_o_header_32)
: sizeof (struct mach_o_header_64)),
errmsg, err))
return NULL;
b = &buf[0];
filetype = (*fetch_32) (b + offsetof (struct mach_o_header_32, filetype));
if (filetype != MACH_O_MH_OBJECT)
{
*errmsg = "Mach-O file is not object file";
*err = 0;
return NULL;
}
omr = XNEW (struct simple_object_mach_o_read);
omr->segment_name = xstrdup (segment_name);
omr->magic = magic;
omr->is_big_endian = is_big_endian;
omr->cputype = (*fetch_32) (b + offsetof (struct mach_o_header_32, cputype));
omr->cpusubtype = (*fetch_32) (b
+ offsetof (struct mach_o_header_32,
cpusubtype));
omr->ncmds = (*fetch_32) (b + offsetof (struct mach_o_header_32, ncmds));
omr->flags = (*fetch_32) (b + offsetof (struct mach_o_header_32, flags));
if (magic == MACH_O_MH_MAGIC)
omr->reserved = 0;
else
omr->reserved = (*fetch_32) (b
+ offsetof (struct mach_o_header_64,
reserved));
return (void *) omr;
}
/* Get the file offset and size from a section header. */
static void
simple_object_mach_o_section_info (int is_big_endian, int is_32,
const unsigned char *sechdr, off_t *offset,
size_t *size)
{
unsigned int (*fetch_32) (const unsigned char *);
ulong_type (*fetch_64) (const unsigned char *);
fetch_32 = (is_big_endian
? simple_object_fetch_big_32
: simple_object_fetch_little_32);
fetch_64 = NULL;
#ifdef UNSIGNED_64BIT_TYPE
fetch_64 = (is_big_endian
? simple_object_fetch_big_64
: simple_object_fetch_little_64);
#endif
if (is_32)
{
*offset = fetch_32 (sechdr
+ offsetof (struct mach_o_section_32, offset));
*size = fetch_32 (sechdr
+ offsetof (struct mach_o_section_32, size));
}
else
{
*offset = fetch_32 (sechdr
+ offsetof (struct mach_o_section_64, offset));
*size = fetch_64 (sechdr
+ offsetof (struct mach_o_section_64, size));
}
}
/* Handle a segment in a Mach-O Object file.
This will callback to the function pfn for each "section found" the meaning
of which depends on gnu extensions to mach-o:
If we find mach-o sections (with the segment name as specified) which also
contain: a 'sects' wrapper, an index, and a name table, we expand this into
as many sections as are specified in the index. In this case, there will
be a callback for each of these.
We will also allow an extension that permits long names (more than 16
characters) to be used with mach-o. In this case, the section name has
a specific format embedding an index into a name table, and the file must
contain such name table.
Return 1 if we should continue, 0 if the caller should return. */
#define SOMO_SECTS_PRESENT 0x01
#define SOMO_INDEX_PRESENT 0x02
#define SOMO_NAMES_PRESENT 0x04
#define SOMO_LONGN_PRESENT 0x08
#define SOMO_WRAPPING (SOMO_SECTS_PRESENT | SOMO_INDEX_PRESENT \
| SOMO_NAMES_PRESENT)
static int
simple_object_mach_o_segment (simple_object_read *sobj, off_t offset,
const unsigned char *segbuf,
int (*pfn) (void *, const char *, off_t offset,
off_t length),
void *data,
const char **errmsg, int *err)
{
struct simple_object_mach_o_read *omr =
(struct simple_object_mach_o_read *) sobj->data;
unsigned int (*fetch_32) (const unsigned char *);
int is_32;
size_t seghdrsize;
size_t sechdrsize;
size_t segname_offset;
size_t sectname_offset;
unsigned int nsects;
unsigned char *secdata;
unsigned int i;
unsigned int gnu_sections_found;
unsigned int strtab_index;
unsigned int index_index;
unsigned int nametab_index;
unsigned int sections_index;
char *strtab;
char *nametab;
unsigned char *index;
size_t strtab_size;
size_t nametab_size;
size_t index_size;
unsigned int n_wrapped_sects;
size_t wrapper_sect_size;
off_t wrapper_sect_offset = 0;
fetch_32 = (omr->is_big_endian
? simple_object_fetch_big_32
: simple_object_fetch_little_32);
is_32 = omr->magic == MACH_O_MH_MAGIC;
if (is_32)
{
seghdrsize = sizeof (struct mach_o_segment_command_32);
sechdrsize = sizeof (struct mach_o_section_32);
segname_offset = offsetof (struct mach_o_section_32, segname);
sectname_offset = offsetof (struct mach_o_section_32, sectname);
nsects = (*fetch_32) (segbuf
+ offsetof (struct mach_o_segment_command_32,
nsects));
}
else
{
seghdrsize = sizeof (struct mach_o_segment_command_64);
sechdrsize = sizeof (struct mach_o_section_64);
segname_offset = offsetof (struct mach_o_section_64, segname);
sectname_offset = offsetof (struct mach_o_section_64, sectname);
nsects = (*fetch_32) (segbuf
+ offsetof (struct mach_o_segment_command_64,
nsects));
}
/* Fetch the section headers from the segment command. */
secdata = XNEWVEC (unsigned char, nsects * sechdrsize);
if (!simple_object_internal_read (sobj->descriptor, offset + seghdrsize,
secdata, nsects * sechdrsize, errmsg, err))
{
XDELETEVEC (secdata);
return 0;
}
/* Scan for special sections that signal GNU extensions to the format. */
gnu_sections_found = 0;
index_index = nsects;
sections_index = nsects;
strtab_index = nsects;
nametab_index = nsects;
for (i = 0; i < nsects; ++i)
{
size_t nameoff;
nameoff = i * sechdrsize + segname_offset;
if (strcmp ((char *) secdata + nameoff, omr->segment_name) != 0)
continue;
nameoff = i * sechdrsize + sectname_offset;
if (strcmp ((char *) secdata + nameoff, GNU_WRAPPER_NAMES) == 0)
{
nametab_index = i;
gnu_sections_found |= SOMO_NAMES_PRESENT;
}
else if (strcmp ((char *) secdata + nameoff, GNU_WRAPPER_INDEX) == 0)
{
index_index = i;
gnu_sections_found |= SOMO_INDEX_PRESENT;
}
else if (strcmp ((char *) secdata + nameoff, GNU_WRAPPER_SECTS) == 0)
{
sections_index = i;
gnu_sections_found |= SOMO_SECTS_PRESENT;
}
else if (strcmp ((char *) secdata + nameoff, GNU_SECTION_NAMES) == 0)
{
strtab_index = i;
gnu_sections_found |= SOMO_LONGN_PRESENT;
}
}
/* If any of the special wrapper section components is present, then
they all should be. */
if ((gnu_sections_found & SOMO_WRAPPING) != 0)
{
off_t nametab_offset;
off_t index_offset;
if ((gnu_sections_found & SOMO_WRAPPING) != SOMO_WRAPPING)
{
*errmsg = "GNU Mach-o section wrapper: required section missing";
*err = 0; /* No useful errno. */
XDELETEVEC (secdata);
return 0;
}
/* Fetch the name table. */
simple_object_mach_o_section_info (omr->is_big_endian, is_32,
secdata + nametab_index * sechdrsize,
&nametab_offset, &nametab_size);
nametab = XNEWVEC (char, nametab_size);
if (!simple_object_internal_read (sobj->descriptor,
sobj->offset + nametab_offset,
(unsigned char *) nametab, nametab_size,
errmsg, err))
{
XDELETEVEC (nametab);
XDELETEVEC (secdata);
return 0;
}
/* Fetch the index. */
simple_object_mach_o_section_info (omr->is_big_endian, is_32,
secdata + index_index * sechdrsize,
&index_offset, &index_size);
index = XNEWVEC (unsigned char, index_size);
if (!simple_object_internal_read (sobj->descriptor,
sobj->offset + index_offset,
index, index_size,
errmsg, err))
{
XDELETEVEC (index);
XDELETEVEC (nametab);
XDELETEVEC (secdata);
return 0;
}
/* The index contains 4 unsigned ints per sub-section:
sub-section offset/length, sub-section name/length.
We fix this for both 32 and 64 bit mach-o for now, since
other fields limit the maximum size of an object to 4G. */
n_wrapped_sects = index_size / 16;
/* Get the parameters for the wrapper too. */
simple_object_mach_o_section_info (omr->is_big_endian, is_32,
secdata + sections_index * sechdrsize,
&wrapper_sect_offset,
&wrapper_sect_size);
}
else
{
index = NULL;
index_size = 0;
nametab = NULL;
nametab_size = 0;
n_wrapped_sects = 0;
}
/* If we have a long names section, fetch it. */
if ((gnu_sections_found & SOMO_LONGN_PRESENT) != 0)
{
off_t strtab_offset;
simple_object_mach_o_section_info (omr->is_big_endian, is_32,
secdata + strtab_index * sechdrsize,
&strtab_offset, &strtab_size);
strtab = XNEWVEC (char, strtab_size);
if (!simple_object_internal_read (sobj->descriptor,
sobj->offset + strtab_offset,
(unsigned char *) strtab, strtab_size,
errmsg, err))
{
XDELETEVEC (strtab);
XDELETEVEC (index);
XDELETEVEC (nametab);
XDELETEVEC (secdata);
return 0;
}
}
else
{
strtab = NULL;
strtab_size = 0;
strtab_index = nsects;
}
/* Process the sections. */
for (i = 0; i < nsects; ++i)
{
const unsigned char *sechdr;
char namebuf[MACH_O_NAME_LEN * 2 + 2];
char *name;
off_t secoffset;
size_t secsize;
int l;
sechdr = secdata + i * sechdrsize;
/* We've already processed the long section names. */
if ((gnu_sections_found & SOMO_LONGN_PRESENT) != 0
&& i == strtab_index)
continue;
/* We only act on the segment named. */
if (strcmp ((char *) sechdr + segname_offset, omr->segment_name) != 0)
continue;
/* Process sections associated with the wrapper. */
if ((gnu_sections_found & SOMO_WRAPPING) != 0)
{
if (i == nametab_index || i == index_index)
continue;
if (i == sections_index)
{
unsigned int j;
for (j = 0; j < n_wrapped_sects; ++j)
{
unsigned int subsect_offset, subsect_length, name_offset;
subsect_offset = (*fetch_32) (index + 16 * j);
subsect_length = (*fetch_32) (index + 16 * j + 4);
name_offset = (*fetch_32) (index + 16 * j + 8);
/* We don't need the name_length yet. */
secoffset = wrapper_sect_offset + subsect_offset;
secsize = subsect_length;
name = nametab + name_offset;
if (!(*pfn) (data, name, secoffset, secsize))
{
*errmsg = NULL;
*err = 0;
XDELETEVEC (index);
XDELETEVEC (nametab);
XDELETEVEC (strtab);
XDELETEVEC (secdata);
return 0;
}
}
continue;
}
}
if ((gnu_sections_found & SOMO_LONGN_PRESENT) != 0)
{
memcpy (namebuf, sechdr + sectname_offset, MACH_O_NAME_LEN);
namebuf[MACH_O_NAME_LEN] = '\0';
name = &namebuf[0];
if (strtab != NULL && name[0] == '_' && name[1] == '_')
{
unsigned long stringoffset;
if (sscanf (name + 2, "%08lX", &stringoffset) == 1)
{
if (stringoffset >= strtab_size)
{
*errmsg = "section name offset out of range";
*err = 0;
XDELETEVEC (index);
XDELETEVEC (nametab);
XDELETEVEC (strtab);
XDELETEVEC (secdata);
return 0;
}
name = strtab + stringoffset;
}
}
}
else
{
/* Otherwise, make a name like __segment,__section as per the
convention in mach-o asm. */
name = &namebuf[0];
memcpy (namebuf, (char *) sechdr + segname_offset, MACH_O_NAME_LEN);
namebuf[MACH_O_NAME_LEN] = '\0';
l = strlen (namebuf);
namebuf[l] = ',';
memcpy (namebuf + l + 1, (char *) sechdr + sectname_offset,
MACH_O_NAME_LEN);
namebuf[l + 1 + MACH_O_NAME_LEN] = '\0';
}
simple_object_mach_o_section_info (omr->is_big_endian, is_32, sechdr,
&secoffset, &secsize);
if (!(*pfn) (data, name, secoffset, secsize))
{
*errmsg = NULL;
*err = 0;
XDELETEVEC (index);
XDELETEVEC (nametab);
XDELETEVEC (strtab);
XDELETEVEC (secdata);
return 0;
}
}
XDELETEVEC (index);
XDELETEVEC (nametab);
XDELETEVEC (strtab);
XDELETEVEC (secdata);
return 1;
}
/* Find all sections in a Mach-O file. */
static const char *
simple_object_mach_o_find_sections (simple_object_read *sobj,
int (*pfn) (void *, const char *,
off_t offset, off_t length),
void *data,
int *err)
{
struct simple_object_mach_o_read *omr =
(struct simple_object_mach_o_read *) sobj->data;
off_t offset;
size_t seghdrsize;
unsigned int (*fetch_32) (const unsigned char *);
const char *errmsg;
unsigned int i;
if (omr->magic == MACH_O_MH_MAGIC)
{
offset = sizeof (struct mach_o_header_32);
seghdrsize = sizeof (struct mach_o_segment_command_32);
}
else
{
offset = sizeof (struct mach_o_header_64);
seghdrsize = sizeof (struct mach_o_segment_command_64);
}
fetch_32 = (omr->is_big_endian
? simple_object_fetch_big_32
: simple_object_fetch_little_32);
for (i = 0; i < omr->ncmds; ++i)
{
unsigned char loadbuf[sizeof (struct mach_o_load_command)];
unsigned int cmd;
unsigned int cmdsize;
if (!simple_object_internal_read (sobj->descriptor,
sobj->offset + offset,
loadbuf,
sizeof (struct mach_o_load_command),
&errmsg, err))
return errmsg;
cmd = (*fetch_32) (loadbuf + offsetof (struct mach_o_load_command, cmd));
cmdsize = (*fetch_32) (loadbuf
+ offsetof (struct mach_o_load_command, cmdsize));
if (cmd == MACH_O_LC_SEGMENT || cmd == MACH_O_LC_SEGMENT_64)
{
unsigned char segbuf[sizeof (struct mach_o_segment_command_64)];
int r;
if (!simple_object_internal_read (sobj->descriptor,
sobj->offset + offset,
segbuf, seghdrsize, &errmsg, err))
return errmsg;
r = simple_object_mach_o_segment (sobj, offset, segbuf, pfn,
data, &errmsg, err);
if (!r)
return errmsg;
}
offset += cmdsize;
}
return NULL;
}
/* Fetch the attributes for an simple_object_read. */
static void *
simple_object_mach_o_fetch_attributes (simple_object_read *sobj,
const char **errmsg ATTRIBUTE_UNUSED,
int *err ATTRIBUTE_UNUSED)
{
struct simple_object_mach_o_read *omr =
(struct simple_object_mach_o_read *) sobj->data;
struct simple_object_mach_o_attributes *ret;
ret = XNEW (struct simple_object_mach_o_attributes);
ret->magic = omr->magic;
ret->is_big_endian = omr->is_big_endian;
ret->cputype = omr->cputype;
ret->cpusubtype = omr->cpusubtype;
ret->flags = omr->flags;
ret->reserved = omr->reserved;
return ret;
}
/* Release the private data for an simple_object_read. */
static void
simple_object_mach_o_release_read (void *data)
{
struct simple_object_mach_o_read *omr =
(struct simple_object_mach_o_read *) data;
free (omr->segment_name);
XDELETE (omr);
}
/* Compare two attributes structures. */
static const char *
simple_object_mach_o_attributes_merge (void *todata, void *fromdata, int *err)
{
struct simple_object_mach_o_attributes *to =
(struct simple_object_mach_o_attributes *) todata;
struct simple_object_mach_o_attributes *from =
(struct simple_object_mach_o_attributes *) fromdata;
if (to->magic != from->magic
|| to->is_big_endian != from->is_big_endian
|| to->cputype != from->cputype)
{
*err = 0;
return "Mach-O object format mismatch";
}
return NULL;
}
/* Release the private data for an attributes structure. */
static void
simple_object_mach_o_release_attributes (void *data)
{
XDELETE (data);
}
/* Prepare to write out a file. */
static void *
simple_object_mach_o_start_write (void *attributes_data,
const char **errmsg ATTRIBUTE_UNUSED,
int *err ATTRIBUTE_UNUSED)
{
struct simple_object_mach_o_attributes *attrs =
(struct simple_object_mach_o_attributes *) attributes_data;
struct simple_object_mach_o_attributes *ret;
/* We're just going to record the attributes, but we need to make a
copy because the user may delete them. */
ret = XNEW (struct simple_object_mach_o_attributes);
*ret = *attrs;
return ret;
}
/* Write out the header of a Mach-O file. */
static int
simple_object_mach_o_write_header (simple_object_write *sobj, int descriptor,
size_t nsects, const char **errmsg,
int *err)
{
struct simple_object_mach_o_attributes *attrs =
(struct simple_object_mach_o_attributes *) sobj->data;
void (*set_32) (unsigned char *, unsigned int);
unsigned char hdrbuf[sizeof (struct mach_o_header_64)];
unsigned char *hdr;
size_t wrsize;
set_32 = (attrs->is_big_endian
? simple_object_set_big_32
: simple_object_set_little_32);
memset (hdrbuf, 0, sizeof hdrbuf);
/* The 32-bit and 64-bit headers start out the same. */
hdr = &hdrbuf[0];
set_32 (hdr + offsetof (struct mach_o_header_32, magic), attrs->magic);
set_32 (hdr + offsetof (struct mach_o_header_32, cputype), attrs->cputype);
set_32 (hdr + offsetof (struct mach_o_header_32, cpusubtype),
attrs->cpusubtype);
set_32 (hdr + offsetof (struct mach_o_header_32, filetype), MACH_O_MH_OBJECT);
set_32 (hdr + offsetof (struct mach_o_header_32, ncmds), 1);
set_32 (hdr + offsetof (struct mach_o_header_32, flags), attrs->flags);
if (attrs->magic == MACH_O_MH_MAGIC)
{
wrsize = sizeof (struct mach_o_header_32);
set_32 (hdr + offsetof (struct mach_o_header_32, sizeofcmds),
(sizeof (struct mach_o_segment_command_32)
+ nsects * sizeof (struct mach_o_section_32)));
}
else
{
set_32 (hdr + offsetof (struct mach_o_header_64, sizeofcmds),
(sizeof (struct mach_o_segment_command_64)
+ nsects * sizeof (struct mach_o_section_64)));
set_32 (hdr + offsetof (struct mach_o_header_64, reserved),
attrs->reserved);
wrsize = sizeof (struct mach_o_header_64);
}
return simple_object_internal_write (descriptor, 0, hdrbuf, wrsize,
errmsg, err);
}
/* Write a Mach-O section header. */
static int
simple_object_mach_o_write_section_header (simple_object_write *sobj,
int descriptor,
size_t sechdr_offset,
const char *name, const char *segn,
size_t secaddr, size_t secsize,
size_t offset, unsigned int align,
const char **errmsg, int *err)
{
struct simple_object_mach_o_attributes *attrs =
(struct simple_object_mach_o_attributes *) sobj->data;
void (*set_32) (unsigned char *, unsigned int);
unsigned char hdrbuf[sizeof (struct mach_o_section_64)];
unsigned char *hdr;
size_t sechdrsize;
set_32 = (attrs->is_big_endian
? simple_object_set_big_32
: simple_object_set_little_32);
memset (hdrbuf, 0, sizeof hdrbuf);
hdr = &hdrbuf[0];
if (attrs->magic == MACH_O_MH_MAGIC)
{
strncpy ((char *) hdr + offsetof (struct mach_o_section_32, sectname),
name, MACH_O_NAME_LEN);
strncpy ((char *) hdr + offsetof (struct mach_o_section_32, segname),
segn, MACH_O_NAME_LEN);
set_32 (hdr + offsetof (struct mach_o_section_32, addr), secaddr);
set_32 (hdr + offsetof (struct mach_o_section_32, size), secsize);
set_32 (hdr + offsetof (struct mach_o_section_32, offset), offset);
set_32 (hdr + offsetof (struct mach_o_section_32, align), align);
/* reloff left as zero. */
/* nreloc left as zero. */
set_32 (hdr + offsetof (struct mach_o_section_32, flags),
MACH_O_S_ATTR_DEBUG);
/* reserved1 left as zero. */
/* reserved2 left as zero. */
sechdrsize = sizeof (struct mach_o_section_32);
}
else
{
#ifdef UNSIGNED_64BIT_TYPE
void (*set_64) (unsigned char *, ulong_type);
set_64 = (attrs->is_big_endian
? simple_object_set_big_64
: simple_object_set_little_64);
strncpy ((char *) hdr + offsetof (struct mach_o_section_64, sectname),
name, MACH_O_NAME_LEN);
strncpy ((char *) hdr + offsetof (struct mach_o_section_64, segname),
segn, MACH_O_NAME_LEN);
set_64 (hdr + offsetof (struct mach_o_section_64, addr), secaddr);
set_64 (hdr + offsetof (struct mach_o_section_64, size), secsize);
set_32 (hdr + offsetof (struct mach_o_section_64, offset), offset);
set_32 (hdr + offsetof (struct mach_o_section_64, align), align);
/* reloff left as zero. */
/* nreloc left as zero. */
set_32 (hdr + offsetof (struct mach_o_section_64, flags),
MACH_O_S_ATTR_DEBUG);