[Mach-O, committed] Add objdump -P function_starts

Tristan Gingold gingold@adacore.com
Thu Mar 27 09:22:00 GMT 2014


Hello,

this patch just add the possibility to display the function_starts info of a Mach-O file.

Committed on trunk.

Tristan.

bfd/
	* mach-o.h (bfd_mach_o_get_base_address): New prototype.
	* mach-o.c (bfd_mach_o_write_symtab)
	(bfd_mach_o_write_contents)
	(bfd_mach_o_set_section_flags_from_bfd)
	(bfd_mach_o_build_seg_command): Fix indentation.
	(bfd_mach_o_get_base_address): New function.

binutils/
	* od-macho.c (OPT_FUNCTION_STARTS): New macro.
	(options): Add entry for function_starts.
	(mach_o_help): Ditto.
	(disp_segment_prot): New function.
	(dump_section_map): Call disp_segment_prot.
	(dump_function_starts): New function.
	(dump_obj_compact_unwind): Fix ouput indentation.
	(dump_exe_compact_unwind): Fix ouput indentation.
	(mach_o_dump): Handle function_starts.

diff --git a/bfd/mach-o.c b/bfd/mach-o.c
index 6237602..8e8842b 100644
--- a/bfd/mach-o.c
+++ b/bfd/mach-o.c
@@ -1478,7 +1478,7 @@ bfd_mach_o_write_symtab (bfd *abfd, bfd_mach_o_load_command *command)
   BFD_ASSERT (command->type == BFD_MACH_O_LC_SYMTAB);
 
   /* Write the symbols first.  */
-  mdata->filelen = FILE_ALIGN(mdata->filelen, wide ? 3 : 2);
+  mdata->filelen = FILE_ALIGN (mdata->filelen, wide ? 3 : 2);
   sym->symoff = mdata->filelen;
   if (bfd_seek (abfd, sym->symoff, SEEK_SET) != 0)
     return FALSE;
@@ -2018,8 +2018,9 @@ bfd_mach_o_write_contents (bfd *abfd)
 	case BFD_MACH_O_LC_SUB_FRAMEWORK:
 	  break;
 	default:
-	  (*_bfd_error_handler) (_("unable to write unknown load command 0x%lx"),
-				 (unsigned long) cur->type);
+	  (*_bfd_error_handler)
+	    (_("unable to write unknown load command 0x%lx"),
+	     (unsigned long) cur->type);
 	  return FALSE;
 	}
     }
@@ -2042,7 +2043,8 @@ bfd_mach_o_append_section_to_segment (bfd_mach_o_segment_command *seg,
 /* Create section Mach-O flags from BFD flags.  */
 
 static void
-bfd_mach_o_set_section_flags_from_bfd (bfd *abfd ATTRIBUTE_UNUSED, asection *sec)
+bfd_mach_o_set_section_flags_from_bfd (bfd *abfd ATTRIBUTE_UNUSED,
+				       asection *sec)
 {
   flagword bfd_flags;
   bfd_mach_o_section *s = bfd_mach_o_get_mach_o_section (sec);
@@ -2173,7 +2175,8 @@ bfd_mach_o_build_seg_command (const char *segment,
       mdata->filelen += s->size;
     }
 
-  /* Now pass through again, for zerofill, only now we just update the vmsize.  */
+  /* Now pass through again, for zerofill, only now we just update the
+     vmsize.  */
   for (i = 0; i < mdata->nsects; ++i)
     {
       bfd_mach_o_section *s = mdata->sections[i];
@@ -4274,6 +4277,35 @@ bfd_mach_o_gen_core_p (bfd *abfd)
   return bfd_mach_o_header_p (abfd, BFD_MACH_O_MH_CORE, 0);
 }
 
+/* Return the base address of ABFD, ie the address at which the image is
+   mapped.  The possible initial pagezero is ignored.  */
+
+bfd_vma
+bfd_mach_o_get_base_address (bfd *abfd)
+{
+  bfd_mach_o_data_struct *mdata;
+  unsigned int i;
+
+  /* Check for Mach-O.  */
+  if (!bfd_mach_o_valid (abfd))
+    return 0;
+  mdata = bfd_mach_o_get_data (abfd);
+
+  for (i = 0; i < mdata->header.ncmds; i++)
+    {
+      bfd_mach_o_load_command *cmd = &mdata->commands[i];
+      if ((cmd->type == BFD_MACH_O_LC_SEGMENT
+	   || cmd->type == BFD_MACH_O_LC_SEGMENT_64))
+	{
+	  struct bfd_mach_o_segment_command *segcmd = &cmd->command.segment;
+
+	  if (segcmd->initprot != 0)
+	    return segcmd->vmaddr;
+	}
+    }
+  return 0;
+}
+
 typedef struct mach_o_fat_archentry
 {
   unsigned long cputype;
diff --git a/bfd/mach-o.h b/bfd/mach-o.h
index 6f695c5..4418b92 100644
--- a/bfd/mach-o.h
+++ b/bfd/mach-o.h
@@ -656,6 +656,8 @@ unsigned int bfd_mach_o_section_get_entry_size (bfd *, bfd_mach_o_section *);
 bfd_boolean bfd_mach_o_read_symtab_symbols (bfd *);
 bfd_boolean bfd_mach_o_read_symtab_strtab (bfd *abfd);
 
+bfd_vma bfd_mach_o_get_base_address (bfd *);
+
 /* A placeholder in case we need to suppress emitting the dysymtab for some
    reason (e.g. compatibility with older system versions).  */
 #define bfd_mach_o_should_emit_dysymtab(x) TRUE

diff --git a/binutils/od-macho.c b/binutils/od-macho.c
index 6f88112..4733e87 100644
--- a/binutils/od-macho.c
+++ b/binutils/od-macho.c
@@ -42,6 +42,7 @@
 #define OPT_CODESIGN 5
 #define OPT_SEG_SPLIT_INFO 6
 #define OPT_COMPACT_UNWIND 7
+#define OPT_FUNCTION_STARTS 8
 
 /* List of actions.  */
 static struct objdump_private_option options[] =
@@ -54,6 +55,7 @@ static struct objdump_private_option options[] =
     { "codesign", 0 },
     { "seg_split_info", 0 },
     { "compact_unwind", 0 },
+    { "function_starts", 0 },
     { NULL, 0 }
   };
 
@@ -64,14 +66,15 @@ mach_o_help (FILE *stream)
 {
   fprintf (stream, _("\
 For Mach-O files:\n\
-  header         Display the file header\n\
-  section        Display the segments and sections commands\n\
-  map            Display the section map\n\
-  load           Display the load commands\n\
-  dysymtab       Display the dynamic symbol table\n\
-  codesign       Display code signature\n\
-  seg_split_info Display segment split info\n\
-  compact_unwind Display compact unwinding info\n\
+  header           Display the file header\n\
+  section          Display the segments and sections commands\n\
+  map              Display the section map\n\
+  load             Display the load commands\n\
+  dysymtab         Display the dynamic symbol table\n\
+  codesign         Display code signature\n\
+  seg_split_info   Display segment split info\n\
+  compact_unwind   Display compact unwinding info\n\
+  function_starts  Display start address of functions\n\
 "));
 }
 
@@ -284,6 +287,14 @@ dump_header (bfd *abfd)
 }
 
 static void
+disp_segment_prot (unsigned int prot)
+{
+  putchar (prot & BFD_MACH_O_PROT_READ ? 'r' : '-');
+  putchar (prot & BFD_MACH_O_PROT_WRITE ? 'w' : '-');
+  putchar (prot & BFD_MACH_O_PROT_EXECUTE ? 'x' : '-');
+}
+
+static void
 dump_section_map (bfd *abfd)
 {
   bfd_mach_o_data_struct *mdata = bfd_mach_o_get_data (abfd);
@@ -309,9 +320,7 @@ dump_section_map (bfd *abfd)
       putchar ('-');
       printf_vma  (seg->vmaddr + seg->vmsize - 1);
       putchar (' ');
-      putchar (seg->initprot & BFD_MACH_O_PROT_READ ? 'r' : '-');
-      putchar (seg->initprot & BFD_MACH_O_PROT_WRITE ? 'w' : '-');
-      putchar (seg->initprot & BFD_MACH_O_PROT_EXECUTE ? 'x' : '-');
+      disp_segment_prot (seg->initprot);
       printf ("]\n");
 
       for (sec = seg->sect_head; sec != NULL; sec = sec->next)
@@ -393,8 +402,13 @@ dump_segment (bfd *abfd ATTRIBUTE_UNUSED, bfd_mach_o_load_command *cmd)
   printf (" endoff: ");
   printf_vma ((bfd_vma)(seg->fileoff + seg->filesize));
   printf ("\n");
-  printf ("   nsects: %lu  ", seg->nsects);
-  printf (" flags: %lx\n", seg->flags);
+  printf ("   nsects: %lu", seg->nsects);
+  printf ("   flags: %lx", seg->flags);
+  printf ("   initprot: ");
+  disp_segment_prot (seg->initprot);
+  printf ("   maxprot: ");
+  disp_segment_prot (seg->maxprot);
+  printf ("\n");
   for (sec = seg->sect_head; sec != NULL; sec = sec->next)
     dump_section_header (abfd, sec);
 }
@@ -912,6 +926,55 @@ dump_segment_split_info (bfd *abfd, bfd_mach_o_linkedit_command *cmd)
 }
 
 static void
+dump_function_starts (bfd *abfd, bfd_mach_o_linkedit_command *cmd)
+{
+  unsigned char *buf = xmalloc (cmd->datasize);
+  unsigned char *end_buf = buf + cmd->datasize;
+  unsigned char *p;
+  bfd_vma addr;
+
+  if (bfd_seek (abfd, cmd->dataoff, SEEK_SET) != 0
+      || bfd_bread (buf, cmd->datasize, abfd) != cmd->datasize)
+    {
+      non_fatal (_("cannot read function starts"));
+      free (buf);
+      return;
+    }
+
+  /* Function starts are delta encoded, starting from the base address.  */
+  addr = bfd_mach_o_get_base_address (abfd);
+
+  for (p = buf; ;)
+    {
+      bfd_vma delta = 0;
+      unsigned int shift = 0;
+
+      if (*p == 0 || p == end_buf)
+	break;
+      while (1)
+	{
+	  unsigned char b = *p++;
+
+	  delta |= (b & 0x7f) << shift;
+	  if ((b & 0x80) == 0)
+	    break;
+	  if (p == end_buf)
+	    {
+	      fputs ("   [truncated]\n", stdout);
+	      break;
+	    }
+	  shift += 7;
+	}
+
+      addr += delta;
+      fputs ("    ", stdout);
+      bfd_printf_vma (abfd, addr);
+      putchar ('\n');
+    }
+  free (buf);
+}
+
+static void
 dump_load_command (bfd *abfd, bfd_mach_o_load_command *cmd,
                    bfd_boolean verbose)
 {
@@ -1005,6 +1068,8 @@ dump_load_command (bfd *abfd, bfd_mach_o_load_command *cmd,
           dump_code_signature (abfd, linkedit);
         else if (verbose && cmd->type == BFD_MACH_O_LC_SEGMENT_SPLIT_INFO)
           dump_segment_split_info (abfd, linkedit);
+        else if (verbose && cmd->type == BFD_MACH_O_LC_FUNCTION_STARTS)
+          dump_function_starts (abfd, linkedit);
         break;
       }
     case BFD_MACH_O_LC_SUB_FRAMEWORK:
@@ -1260,7 +1325,7 @@ dump_obj_compact_unwind (bfd *abfd,
   int is_64 = mdata->header.version == 2;
   const unsigned char *p;
 
-  printf (" compact unwind info:\n");
+  printf ("Compact unwind info:\n");
   printf (" start            length   personality      lsda\n");
 
   if (is_64)
@@ -1309,7 +1374,7 @@ dump_exe_compact_unwind (bfd *abfd,
   unsigned int i;
 
   /* The header.  */
-  printf (" compact unwind info:\n");
+  printf ("Compact unwind info:\n");
 
   hdr = (struct mach_o_unwind_info_header *) content;
   if (size < sizeof (*hdr))
@@ -1544,6 +1609,8 @@ mach_o_dump (bfd *abfd)
     dump_load_commands (abfd, BFD_MACH_O_LC_CODE_SIGNATURE, 0);
   if (options[OPT_SEG_SPLIT_INFO].selected)
     dump_load_commands (abfd, BFD_MACH_O_LC_SEGMENT_SPLIT_INFO, 0);
+  if (options[OPT_FUNCTION_STARTS].selected)
+    dump_load_commands (abfd, BFD_MACH_O_LC_FUNCTION_STARTS, 0);
   if (options[OPT_COMPACT_UNWIND].selected)
     {
       dump_section_content (abfd, "__LD", "__compact_unwind",



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