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[Mach-O]: Dump dyld info data
- From: Tristan Gingold <gingold at adacore dot com>
- To: "binutils at sourceware dot org Development" <binutils at sourceware dot org>
- Date: Wed, 16 Apr 2014 12:26:06 +0200
- Subject: [Mach-O]: Dump dyld info data
- Authentication-results: sourceware.org; auth=none
Hi,
with this patch, objdump can fully decode and display the dyld_info command.
Committed on trunk.
Tristan.
include/mach-o/
* loader.h: Add macros for rebase, bind and export constants.
binutils/
* od-macho.c (OPT_DYLD_INFO): New macro.
(options): Add entry for dyld_info.
(mach_o_help): Likewise.
(load_and_dump, dump_dyld_info_rebase, dump_dyld_info_bind)
(dump_dyld_info_export_1, dump_dyld_info_export): New functions.
(bfd_mach_o_dyld_rebase_type_name): New array.
(export_info_data): New struct.
(dump_dyld_info): Add verbose argument. Dump rebase, bind and
exports data.
(dump_load_command): Adjust dump_dyld_info call.
(mach_o_dump): Handle dyld_info.
diff --git a/binutils/od-macho.c b/binutils/od-macho.c
index 92d6a73..bf90f09 100644
--- a/binutils/od-macho.c
+++ b/binutils/od-macho.c
@@ -45,6 +45,7 @@
#define OPT_FUNCTION_STARTS 8
#define OPT_DATA_IN_CODE 9
#define OPT_TWOLEVEL_HINTS 10
+#define OPT_DYLD_INFO 11
/* List of actions. */
static struct objdump_private_option options[] =
@@ -60,6 +61,7 @@ static struct objdump_private_option options[] =
{ "function_starts", 0 },
{ "data_in_code", 0 },
{ "twolevel_hints", 0 },
+ { "dyld_info", 0 },
{ NULL, 0 }
};
@@ -81,6 +83,7 @@ For Mach-O files:\n\
function_starts Display start address of functions\n\
data_in_code Display data in code entries\n\
twolevel_hints Display the two-level namespace lookup hints table\n\
+ dyld_info Display dyld information\n\
"));
}
@@ -622,8 +625,319 @@ dump_dysymtab (bfd *abfd, bfd_mach_o_load_command *cmd, bfd_boolean verbose)
}
+static bfd_boolean
+load_and_dump (bfd *abfd, ufile_ptr off, unsigned int len,
+ void (*dump)(bfd *abfd, unsigned char *buf, unsigned int len,
+ ufile_ptr off))
+{
+ unsigned char *buf;
+
+ if (len == 0)
+ return TRUE;
+
+ buf = xmalloc (len);
+
+ if (bfd_seek (abfd, off, SEEK_SET) == 0
+ && bfd_bread (buf, len, abfd) == len)
+ dump (abfd, buf, len, off);
+ else
+ return FALSE;
+
+ free (buf);
+ return TRUE;
+}
+
+static const bfd_mach_o_xlat_name bfd_mach_o_dyld_rebase_type_name[] =
+{
+ { "pointer", BFD_MACH_O_REBASE_TYPE_POINTER },
+ { "text_abs32", BFD_MACH_O_REBASE_TYPE_TEXT_ABSOLUTE32 },
+ { "text_pcrel32", BFD_MACH_O_REBASE_TYPE_TEXT_PCREL32 },
+ { NULL, 0 }
+};
+
+static void
+dump_dyld_info_rebase (bfd *abfd, unsigned char *buf, unsigned int len,
+ ufile_ptr off ATTRIBUTE_UNUSED)
+{
+ unsigned int i;
+ bfd_mach_o_data_struct *mdata = bfd_mach_o_get_data (abfd);
+ unsigned int ptrsize = mdata->header.version == 2 ? 8 : 4;
+
+ for (i = 0; i < len; )
+ {
+ unsigned char b = buf[i++];
+ unsigned char imm = b & BFD_MACH_O_REBASE_IMMEDIATE_MASK;
+ bfd_vma leb;
+ unsigned int leblen;
+
+ printf (" [0x%04x] 0x%02x: ", i, b);
+ switch (b & BFD_MACH_O_REBASE_OPCODE_MASK)
+ {
+ case BFD_MACH_O_REBASE_OPCODE_DONE:
+ printf ("done\n");
+ return;
+ case BFD_MACH_O_REBASE_OPCODE_SET_TYPE_IMM:
+ printf ("set_type %s\n",
+ bfd_mach_o_get_name (bfd_mach_o_dyld_rebase_type_name, imm));
+ break;
+ case BFD_MACH_O_REBASE_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB:
+ leb = read_unsigned_leb128 (abfd, buf + i, &leblen);
+ printf ("set segment: %u and offset: 0x%08x\n",
+ imm, (unsigned) leb);
+ i += leblen;
+ break;
+ case BFD_MACH_O_REBASE_OPCODE_ADD_ADDR_ULEB:
+ leb = read_unsigned_leb128 (abfd, buf + i, &leblen);
+ printf ("add addr uleb: 0x%08x\n", (unsigned) leb);
+ i += leblen;
+ break;
+ case BFD_MACH_O_REBASE_OPCODE_ADD_ADDR_IMM_SCALED:
+ printf ("add addr imm scaled: %u\n", imm * ptrsize);
+ break;
+ case BFD_MACH_O_REBASE_OPCODE_DO_REBASE_IMM_TIMES:
+ printf ("rebase imm times: %u\n", imm);
+ break;
+ case BFD_MACH_O_REBASE_OPCODE_DO_REBASE_ULEB_TIMES:
+ leb = read_unsigned_leb128 (abfd, buf + i, &leblen);
+ printf ("rebase uleb times: %u\n", (unsigned) leb);
+ i += leblen;
+ break;
+ case BFD_MACH_O_REBASE_OPCODE_DO_REBASE_ADD_ADDR_ULEB:
+ leb = read_unsigned_leb128 (abfd, buf + i, &leblen);
+ printf ("rebase add addr uleb: %u\n", (unsigned) leb);
+ i += leblen;
+ break;
+ case BFD_MACH_O_REBASE_OPCODE_DO_REBASE_ULEB_TIMES_SKIPPING_ULEB:
+ leb = read_unsigned_leb128 (abfd, buf + i, &leblen);
+ printf ("rebase uleb times (%u)", (unsigned) leb);
+ i += leblen;
+ leb = read_unsigned_leb128 (abfd, buf + i, &leblen);
+ printf (" skipping uleb (%u)\n", (unsigned) leb);
+ i += leblen;
+ break;
+ default:
+ printf ("unknown\n");
+ return;
+ }
+ }
+ printf (" rebase commands without end!\n");
+}
+
+static void
+dump_dyld_info_bind (bfd *abfd, unsigned char *buf, unsigned int len,
+ ufile_ptr off ATTRIBUTE_UNUSED)
+{
+ unsigned int i;
+ bfd_mach_o_data_struct *mdata = bfd_mach_o_get_data (abfd);
+ unsigned int ptrsize = mdata->header.version == 2 ? 8 : 4;
+
+ for (i = 0; i < len; )
+ {
+ unsigned char b = buf[i++];
+ unsigned char imm = b & BFD_MACH_O_BIND_IMMEDIATE_MASK;
+ bfd_vma leb;
+ unsigned int leblen;
+
+ printf (" [0x%04x] 0x%02x: ", i, b);
+ switch (b & BFD_MACH_O_BIND_OPCODE_MASK)
+ {
+ case BFD_MACH_O_BIND_OPCODE_DONE:
+ printf ("done\n");
+ return;
+ case BFD_MACH_O_BIND_OPCODE_SET_DYLIB_ORDINAL_IMM:
+ printf ("set dylib ordinal imm: %u\n", imm);
+ break;
+ case BFD_MACH_O_BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB:
+ leb = read_unsigned_leb128 (abfd, buf + i, &leblen);
+ printf ("set dylib ordinal uleb: %u\n", imm);
+ i += leblen;
+ break;
+ case BFD_MACH_O_BIND_OPCODE_SET_DYLIB_SPECIAL_IMM:
+ imm = (imm != 0) ? imm | BFD_MACH_O_BIND_OPCODE_MASK : imm;
+ printf ("set dylib special imm: %d\n", imm);
+ break;
+ case BFD_MACH_O_BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM:
+ printf ("set symbol trailing flags imm: 0x%02x, ", imm);
+ for (; i < len && buf[i] != 0; i++)
+ putchar (buf[i] >= ' ' && buf[i] < 0x7f ? buf[i] : '?');
+ putchar ('\n');
+ i++;
+ break;
+ case BFD_MACH_O_BIND_OPCODE_SET_TYPE_IMM:
+ /* Kludge: use the same table as rebase type. */
+ printf ("set_type %s\n",
+ bfd_mach_o_get_name (bfd_mach_o_dyld_rebase_type_name, imm));
+ break;
+ case BFD_MACH_O_BIND_OPCODE_SET_ADDEND_SLEB:
+ {
+ bfd_signed_vma svma;
+ svma = read_unsigned_leb128 (abfd, buf + i, &leblen);
+ printf ("set addend sleb: 0x%08x\n", (unsigned) svma);
+ i += leblen;
+ }
+ break;
+ case BFD_MACH_O_BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB:
+ leb = read_unsigned_leb128 (abfd, buf + i, &leblen);
+ printf ("set segment: %u and offset: 0x%08x\n",
+ imm, (unsigned) leb);
+ i += leblen;
+ break;
+ case BFD_MACH_O_BIND_OPCODE_ADD_ADDR_ULEB:
+ leb = read_unsigned_leb128 (abfd, buf + i, &leblen);
+ printf ("add addr uleb: 0x%08x\n", (unsigned) leb);
+ i += leblen;
+ break;
+ case BFD_MACH_O_BIND_OPCODE_DO_BIND:
+ printf ("do bind\n");
+ break;
+ case BFD_MACH_O_BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB:
+ leb = read_unsigned_leb128 (abfd, buf + i, &leblen);
+ printf ("do bind add addr uleb: 0x%08x\n", (unsigned) leb);
+ i += leblen;
+ break;
+ case BFD_MACH_O_BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED:
+ printf ("do bind add addr imm scaled: %u\n", imm * ptrsize);
+ break;
+ case BFD_MACH_O_BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB:
+ leb = read_unsigned_leb128 (abfd, buf + i, &leblen);
+ printf ("do bind uleb times (%u)", (unsigned) leb);
+ i += leblen;
+ leb = read_unsigned_leb128 (abfd, buf + i, &leblen);
+ printf (" skipping uleb (%u)\n", (unsigned) leb);
+ i += leblen;
+ break;
+ default:
+ printf ("unknown\n");
+ return;
+ }
+ }
+ printf (" bind commands without end!\n");
+}
+
+struct export_info_data
+{
+ const unsigned char *name;
+ struct export_info_data *next;
+};
+
static void
-dump_dyld_info (bfd *abfd ATTRIBUTE_UNUSED, bfd_mach_o_load_command *cmd)
+dump_dyld_info_export_1 (bfd *abfd, unsigned char *buf, unsigned int len,
+ unsigned int off, struct export_info_data *parent,
+ struct export_info_data *base)
+{
+ bfd_vma size;
+ unsigned int leblen;
+ unsigned int child_count;
+ unsigned int i;
+
+ size = read_unsigned_leb128 (abfd, buf + off, &leblen);
+ off += leblen;
+
+ if (size != 0)
+ {
+ bfd_vma flags;
+ struct export_info_data *d;
+
+ flags = read_unsigned_leb128 (abfd, buf + off, &leblen);
+ off += leblen;
+
+ fputs (" ", stdout);
+ switch (flags & BFD_MACH_O_EXPORT_SYMBOL_FLAGS_KIND_MASK)
+ {
+ case BFD_MACH_O_EXPORT_SYMBOL_FLAGS_KIND_REGULAR:
+ putchar ('-');
+ break;
+ case BFD_MACH_O_EXPORT_SYMBOL_FLAGS_KIND_THREAD_LOCAL:
+ putchar ('T');
+ break;
+ default:
+ putchar ('?');
+ break;
+ }
+ putchar ((flags & BFD_MACH_O_EXPORT_SYMBOL_FLAGS_WEAK_DEFINITION) ?
+ 'W' : '-');
+
+ if (flags & BFD_MACH_O_EXPORT_SYMBOL_FLAGS_REEXPORT)
+ {
+ bfd_vma lib;
+
+ lib = read_unsigned_leb128 (abfd, buf + off, &leblen);
+ off += leblen;
+
+ fputs (" [reexport] ", stdout);
+ for (d = base; d != NULL; d = d->next)
+ printf ("%s", d->name);
+
+ fputs (" (", stdout);
+ if (buf[off] != 0)
+ {
+ fputs ((const char *)buf + off, stdout);
+ putchar (' ');
+ off += strlen ((const char *)buf + off);
+ }
+ printf ("from dylib %u)\n", (unsigned) lib);
+ off++;
+ }
+ else
+ {
+ bfd_vma offset;
+ bfd_vma resolv = 0;
+
+ offset = read_unsigned_leb128 (abfd, buf + off, &leblen);
+ off += leblen;
+
+ if (flags & BFD_MACH_O_EXPORT_SYMBOL_FLAGS_STUB_AND_RESOLVER)
+ {
+ resolv = read_unsigned_leb128 (abfd, buf + off, &leblen);
+ off += leblen;
+ }
+
+ printf (" 0x%08x ", (unsigned) offset);
+ for (d = base; d != NULL; d = d->next)
+ printf ("%s", d->name);
+ if (flags & BFD_MACH_O_EXPORT_SYMBOL_FLAGS_STUB_AND_RESOLVER)
+ printf (" [resolv: 0x%08x]", (unsigned) resolv);
+ printf ("\n");
+ }
+ }
+
+ child_count = read_unsigned_leb128 (abfd, buf + off, &leblen);
+ off += leblen;
+
+ for (i = 0; i < child_count; i++)
+ {
+ struct export_info_data sub_data;
+ bfd_vma sub_off;
+
+ sub_data.name = buf + off;
+ sub_data.next = NULL;
+ parent->next = &sub_data;
+
+ off += strlen ((const char *)buf + off) + 1;
+
+ sub_off = read_unsigned_leb128 (abfd, buf + off, &leblen);
+ off += leblen;
+
+ dump_dyld_info_export_1 (abfd, buf, len, sub_off, &sub_data, base);
+ }
+}
+
+static void
+dump_dyld_info_export (bfd *abfd, unsigned char *buf, unsigned int len,
+ ufile_ptr off ATTRIBUTE_UNUSED)
+{
+ struct export_info_data data;
+
+ data.name = (const unsigned char *) "";
+ data.next = NULL;
+
+ printf (" fl offset sym (Flags: Tls Weak)\n");
+ dump_dyld_info_export_1 (abfd, buf, len, 0, &data, &data);
+}
+
+static void
+dump_dyld_info (bfd *abfd, bfd_mach_o_load_command *cmd,
+ bfd_boolean verbose)
{
bfd_mach_o_dyld_info_command *info = &cmd->command.dyld_info;
@@ -642,6 +956,34 @@ dump_dyld_info (bfd *abfd ATTRIBUTE_UNUSED, bfd_mach_o_load_command *cmd)
printf (" export: off: 0x%08x size: %-8u (endoff: 0x%08x)\n",
info->export_off, info->export_size,
info->export_off + info->export_size);
+
+ if (!verbose)
+ return;
+
+ printf (" rebase:\n");
+ if (!load_and_dump (abfd, info->rebase_off, info->rebase_size,
+ dump_dyld_info_rebase))
+ non_fatal (_("cannot read rebase dyld info"));
+
+ printf (" bind:\n");
+ if (!load_and_dump (abfd, info->bind_off, info->bind_size,
+ dump_dyld_info_bind))
+ non_fatal (_("cannot read bind dyld info"));
+
+ printf (" weak bind:\n");
+ if (!load_and_dump (abfd, info->weak_bind_off, info->weak_bind_size,
+ dump_dyld_info_bind))
+ non_fatal (_("cannot read weak bind dyld info"));
+
+ printf (" lazy bind:\n");
+ if (!load_and_dump (abfd, info->lazy_bind_off, info->lazy_bind_size,
+ dump_dyld_info_bind))
+ non_fatal (_("cannot read lazy bind dyld info"));
+
+ printf (" exported symbols:\n");
+ if (!load_and_dump (abfd, info->export_off, info->export_size,
+ dump_dyld_info_export))
+ non_fatal (_("cannot read export symbols dyld info"));
}
static void
@@ -1219,16 +1561,15 @@ dump_load_command (bfd *abfd, bfd_mach_o_load_command *cmd,
{
bfd_mach_o_encryption_info_command *cryp =
&cmd->command.encryption_info;
- printf
- (" cryptoff: 0x%08x cryptsize: 0x%08x (endoff 0x%08x)"
- " cryptid: %u\n",
- cryp->cryptoff, cryp->cryptsize,
- cryp->cryptoff + cryp->cryptsize,
- cryp->cryptid);
+ printf (" cryptoff: 0x%08x cryptsize: 0x%08x (endoff 0x%08x)"
+ " cryptid: %u\n",
+ cryp->cryptoff, cryp->cryptsize,
+ cryp->cryptoff + cryp->cryptsize,
+ cryp->cryptid);
}
break;
case BFD_MACH_O_LC_DYLD_INFO:
- dump_dyld_info (abfd, cmd);
+ dump_dyld_info (abfd, cmd, verbose);
break;
case BFD_MACH_O_LC_VERSION_MIN_MACOSX:
case BFD_MACH_O_LC_VERSION_MIN_IPHONEOS:
@@ -1791,6 +2132,8 @@ mach_o_dump (bfd *abfd)
dump_section_content (abfd, "__TEXT", "__unwind_info",
dump_exe_compact_unwind);
}
+ if (options[OPT_DYLD_INFO].selected)
+ dump_load_commands (abfd, BFD_MACH_O_LC_DYLD_INFO, 0);
}
/* Vector for Mach-O. */
diff --git a/include/mach-o/loader.h b/include/mach-o/loader.h
index 20cfe42..ff794a3 100644
--- a/include/mach-o/loader.h
+++ b/include/mach-o/loader.h
@@ -342,6 +342,63 @@ bfd_mach_o_section_attribute;
#define BFD_MACH_O_INDIRECT_SYM_LOCAL 0x80000000
#define BFD_MACH_O_INDIRECT_SYM_ABS 0x40000000
+/* Constants for dyld info rebase. */
+#define BFD_MACH_O_REBASE_OPCODE_MASK 0xf0
+#define BFD_MACH_O_REBASE_IMMEDIATE_MASK 0x0f
+
+/* The rebase opcodes. */
+#define BFD_MACH_O_REBASE_OPCODE_DONE 0x00
+#define BFD_MACH_O_REBASE_OPCODE_SET_TYPE_IMM 0x10
+#define BFD_MACH_O_REBASE_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB 0x20
+#define BFD_MACH_O_REBASE_OPCODE_ADD_ADDR_ULEB 0x30
+#define BFD_MACH_O_REBASE_OPCODE_ADD_ADDR_IMM_SCALED 0x40
+#define BFD_MACH_O_REBASE_OPCODE_DO_REBASE_IMM_TIMES 0x50
+#define BFD_MACH_O_REBASE_OPCODE_DO_REBASE_ULEB_TIMES 0x60
+#define BFD_MACH_O_REBASE_OPCODE_DO_REBASE_ADD_ADDR_ULEB 0x70
+#define BFD_MACH_O_REBASE_OPCODE_DO_REBASE_ULEB_TIMES_SKIPPING_ULEB 0x80
+
+/* The rebase type. */
+#define BFD_MACH_O_REBASE_TYPE_POINTER 1
+#define BFD_MACH_O_REBASE_TYPE_TEXT_ABSOLUTE32 2
+#define BFD_MACH_O_REBASE_TYPE_TEXT_PCREL32 3
+
+/* Constants for dyld info bind. */
+#define BFD_MACH_O_BIND_OPCODE_MASK 0xf0
+#define BFD_MACH_O_BIND_IMMEDIATE_MASK 0x0f
+
+/* The bind opcodes. */
+#define BFD_MACH_O_BIND_OPCODE_DONE 0x00
+#define BFD_MACH_O_BIND_OPCODE_SET_DYLIB_ORDINAL_IMM 0x10
+#define BFD_MACH_O_BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB 0x20
+#define BFD_MACH_O_BIND_OPCODE_SET_DYLIB_SPECIAL_IMM 0x30
+#define BFD_MACH_O_BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM 0x40
+#define BFD_MACH_O_BIND_OPCODE_SET_TYPE_IMM 0x50
+#define BFD_MACH_O_BIND_OPCODE_SET_ADDEND_SLEB 0x60
+#define BFD_MACH_O_BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB 0x70
+#define BFD_MACH_O_BIND_OPCODE_ADD_ADDR_ULEB 0x80
+#define BFD_MACH_O_BIND_OPCODE_DO_BIND 0x90
+#define BFD_MACH_O_BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB 0xa0
+#define BFD_MACH_O_BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED 0xb0
+#define BFD_MACH_O_BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB 0xc0
+
+/* The bind types. */
+#define BFD_MACH_O_BIND_TYPE_POINTER 1
+#define BFD_MACH_O_BIND_TYPE_TEXT_ABSOLUTE32 2
+#define BFD_MACH_O_BIND_TYPE_TEXT_PCREL32 3
+
+/* The special dylib. */
+#define BFD_MACH_O_BIND_SPECIAL_DYLIB_SELF 0
+#define BFD_MACH_O_BIND_SPECIAL_DYLIB_MAIN_EXECUTABLE -1
+#define BFD_MACH_O_BIND_SPECIAL_DYLIB_FLAT_LOOKUP -2
+
+/* Constants for dyld info export. */
+#define BFD_MACH_O_EXPORT_SYMBOL_FLAGS_KIND_MASK 0x03
+#define BFD_MACH_O_EXPORT_SYMBOL_FLAGS_KIND_REGULAR 0x00
+#define BFD_MACH_O_EXPORT_SYMBOL_FLAGS_KIND_THREAD_LOCAL 0x01
+#define BFD_MACH_O_EXPORT_SYMBOL_FLAGS_WEAK_DEFINITION 0x04
+#define BFD_MACH_O_EXPORT_SYMBOL_FLAGS_REEXPORT 0x08
+#define BFD_MACH_O_EXPORT_SYMBOL_FLAGS_STUB_AND_RESOLVER 0x10
+
/* Constants for DATA_IN_CODE entries. */
typedef enum bfd_mach_o_data_in_code_entry_kind
{