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[Patch] Darwin: dump segment split info


Hi,

I am committing this patch to display Mach-O segment split info data.

Tristan.

binutils/
2012-01-20  Tristan Gingold  <gingold@adacore.com>

	* od-macho.c (OPT_SEG_SPLIT_INFO): New macro.
	(options): Add an entry for seg_split_info.
	(mach_o_help): Document it.
	(dump_segment_split_info): New function.
	(dump_load_command): Handle seg_split_info.

Index: od-macho.c
===================================================================
RCS file: /cvs/src/src/binutils/od-macho.c,v
retrieving revision 1.4
diff -c -r1.4 od-macho.c
*** od-macho.c	4 Jan 2012 10:37:36 -0000	1.4
--- od-macho.c	20 Jan 2012 10:39:22 -0000
***************
*** 27,32 ****
--- 27,33 ----
  #include "objdump.h"
  #include "bucomm.h"
  #include "bfdlink.h"
+ #include "libbfd.h"
  #include "mach-o.h"
  #include "mach-o/external.h"
  #include "mach-o/codesign.h"
***************
*** 38,43 ****
--- 39,45 ----
  #define OPT_LOAD 3
  #define OPT_DYSYMTAB 4
  #define OPT_CODESIGN 5
+ #define OPT_SEG_SPLIT_INFO 6
  
  /* List of actions.  */
  static struct objdump_private_option options[] =
***************
*** 48,53 ****
--- 50,56 ----
      { "load", 0 },
      { "dysymtab", 0 },
      { "codesign", 0 },
+     { "seg_split_info", 0 },
      { NULL, 0 }
    };
  
***************
*** 58,69 ****
  {
    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 section\n\
  "));
  }
  
--- 61,73 ----
  {
    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\
  "));
  }
  
***************
*** 852,857 ****
--- 856,908 ----
  }
  
  static void
+ dump_segment_split_info (bfd *abfd, bfd_mach_o_linkedit_command *cmd)
+ {
+   unsigned char *buf = xmalloc (cmd->datasize);
+   unsigned char *p;
+   unsigned int len;
+   bfd_vma addr = 0;
+ 
+   if (bfd_seek (abfd, cmd->dataoff, SEEK_SET) != 0
+       || bfd_bread (buf, cmd->datasize, abfd) != cmd->datasize)
+     {
+       non_fatal (_("cannot read segment split info"));
+       free (buf);
+       return;
+     }
+   if (buf[cmd->datasize - 1] != 0)
+     {
+       non_fatal (_("segment split info is not nul terminated"));
+       free (buf);
+       return;
+     }
+ 
+   switch (buf[0])
+     {
+     case 0:
+       printf (_("  32 bit pointers:\n"));
+       break;
+     case 1:
+       printf (_("  64 bit pointers:\n"));
+       break;
+     case 2:
+       printf (_("  PPC hi-16:\n"));
+       break;
+     default:
+       printf (_("  Unhandled location type %u\n"), buf[0]);
+       break;
+     }
+   for (p = buf + 1; *p != 0; p += len)
+     {
+       addr += read_unsigned_leb128 (abfd, p, &len);
+       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)
  {
***************
*** 942,947 ****
--- 993,1000 ----
  
          if (verbose && cmd->type == BFD_MACH_O_LC_CODE_SIGNATURE)
            dump_code_signature (abfd, linkedit);
+         else if (verbose && cmd->type == BFD_MACH_O_LC_SEGMENT_SPLIT_INFO)
+           dump_segment_split_info (abfd, linkedit);
          break;
        }
      case BFD_MACH_O_LC_SUB_FRAMEWORK:
***************
*** 1026,1031 ****
--- 1079,1086 ----
      dump_load_commands (abfd, BFD_MACH_O_LC_DYSYMTAB, 0);
    if (options[OPT_CODESIGN].selected)
      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);
  }
  
  /* Vector for Mach-O.  */


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