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tdep/1586: GDB doesn't support remote debug of ARM pic code

From: rschmitt at bluepeach dot com
To: gdb-gnats at sources dot redhat dot com
Cc: mribeiro at hypercom dot com
Date: 14 Mar 2004 21:39:47 -0000
Subject: tdep/1586: GDB doesn't support remote debug of ARM pic code
Reply-to: rschmitt at bluepeach dot com
>Number:         1586
>Category:       tdep
>Synopsis:       GDB doesn't support remote debug of ARM pic code
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Mar 14 21:48:00 UTC 2004
>Closed-Date:
>Last-Modified:
>Originator:     rschmitt@bluepeach.com
>Release:        GDB 6.1
>Organization:
>Environment:
I use cygwin with a GDB built for xscale-elf.  I also use connect to a remote target
>Description:
When stepping into an ARM subroutine in position independent code (-fpic), gdb will get confused and set the routine's entry breakpoint at the wrong place.

As I see it, there are two problems.  First, when using remote debug, gdb will not relocate the .plt section in the symbol table.  I've added code to relocate the .plt section with the same offset that is used for the .text section (see attached dif).  The second issue is that arm-tdep does not recognize the .plt trampolines.  I've added code to recognize the trampoline and correctly calculate the true offset. (see attachment)
>How-To-Repeat:
Build an application for the arm using -fpic.  Use gdb and remotely connect to the target.  Set a breakpoint within the pic code at a call to a subroutine and start the app using whatever mechanism is appropriate for the target.  When the breakpoint is hit, single step into the subroutine.  The breakpoint will be inserted at the wrong location and the target will not stop when entering into the routine.
>Fix:
Index: arm-tdep.c
===================================================================
RCS file: /cvs/src/src/gdb/arm-tdep.c,v
retrieving revision 1.164.4.3
diff -c -r1.164.4.3 arm-tdep.c
*** arm-tdep.c	9 Mar 2004 17:10:19 -0000	1.164.4.3
--- arm-tdep.c	14 Mar 2004 21:22:46 -0000
***************
*** 24,29 ****
--- 24,30 ----
  #include "defs.h"
  #include "frame.h"
  #include "inferior.h"
+ #include "objfiles.h"
  #include "gdbcmd.h"
  #include "gdbcore.h"
  #include "gdb_string.h"
***************
*** 2372,2377 ****
--- 2373,2381 ----
  {
    CORE_ADDR start_addr;
  
+   if (in_plt_section (pc, name))
+     return (1) ;
+ 
    /* Find the starting address of the function containing the PC.  If
       the caller didn't give us a name, look it up at the same time.  */
    if (0 == find_pc_partial_function (pc, name ? NULL : &name, 
***************
*** 2381,2386 ****
--- 2385,2429 ----
    return strncmp (name, "_call_via_r", 11) == 0;
  }
  
+ CORE_ADDR
+ find_ddl_trampoline_target (CORE_ADDR pc)
+ {
+   CORE_ADDR ret_addr ;
+   CORE_ADDR rel_offset ;
+   char buf[4];
+ 
+   if (IN_SOLIB_CALL_TRAMPOLINE (pc, NULL))
+     {
+       /*
+        * Read .GOT offset (it's always at offset 6)
+        */
+       if (target_read_memory (pc + 12, buf, INT_REGISTER_RAW_SIZE))
+ 	{
+ 	  ret_addr = 0 ;
+ 	}
+       else
+ 	{
+ 	  rel_offset = extract_unsigned_integer (buf, INT_REGISTER_RAW_SIZE) ;
+ 	  /*
+ 	   * Now read function address
+ 	   */
+ 	  if (target_read_memory (pc + 12 + rel_offset, buf, 
+ 				  INT_REGISTER_RAW_SIZE))
+ 	    {
+ 	      ret_addr = 0 ;
+ 	    }
+ 	  else
+ 	    {
+ 	      ret_addr = extract_unsigned_integer (buf, INT_REGISTER_RAW_SIZE) ;
+ 	    }
+ 	}
+     }
+   else
+     ret_addr = 0 ;
+ 
+   return (ret_addr) ;
+ }
+ 
  /* If PC is in a Thumb call or return stub, return the address of the
     target PC, which is in a register.  The thunk functions are called
     _called_via_xx, where x is the register name.  The possible names
***************
*** 2391,2396 ****
--- 2434,2443 ----
  {
    char *name;
    CORE_ADDR start_addr;
+ 
+   start_addr = find_ddl_trampoline_target (pc) ;
+   if (start_addr != 0)
+     return (start_addr) ;
  
    /* Find the starting address and name of the function containing the PC.  */
    if (find_pc_partial_function (pc, &name, &start_addr, NULL) == 0)
Index: objfiles.h
===================================================================
RCS file: /cvs/src/src/gdb/objfiles.h,v
retrieving revision 1.35
diff -c -r1.35 objfiles.h
*** objfiles.h	14 Feb 2004 15:46:33 -0000	1.35
--- objfiles.h	14 Mar 2004 21:22:47 -0000
***************
*** 409,414 ****
--- 409,415 ----
         SOM version. */
  
      int sect_index_text;
+     int sect_index_plt;
      int sect_index_data;
      int sect_index_bss;
      int sect_index_rodata;
***************
*** 654,659 ****
--- 655,665 ----
       ((objfile->sect_index_text == -1) \
        ? (internal_error (__FILE__, __LINE__, "sect_index_text not initialized"), -1) \
        : objfile->sect_index_text)
+ 
+ #define SECT_OFF_PLT(objfile) \
+      ((objfile->sect_index_plt == -1) \
+       ? (internal_error (__FILE__, __LINE__, "sect_index_plt not initialized"), -1) \
+       : objfile->sect_index_plt)
  
  /* Sometimes the .bss section is missing from the objfile, so we don't
     want to die here. Let the users of SECT_OFF_BSS deal with an
Index: remote.c
===================================================================
RCS file: /cvs/src/src/gdb/remote.c,v
retrieving revision 1.130
diff -c -r1.130 remote.c
*** remote.c	25 Feb 2004 20:41:00 -0000	1.130
--- remote.c	14 Mar 2004 21:22:50 -0000
***************
*** 1992,1997 ****
--- 1992,1998 ----
  	  SIZEOF_N_SECTION_OFFSETS (symfile_objfile->num_sections));
  
    offs->offsets[SECT_OFF_TEXT (symfile_objfile)] = text_addr;
+   offs->offsets[SECT_OFF_PLT (symfile_objfile)] = text_addr;
  
    /* This is a temporary kludge to force data and bss to use the same offsets
       because that's what nlmconv does now.  The real solution requires changes
***************
*** 1999,2005 ****
  
    offs->offsets[SECT_OFF_DATA (symfile_objfile)] = data_addr;
    offs->offsets[SECT_OFF_BSS (symfile_objfile)] = data_addr;
- 
    objfile_relocate (symfile_objfile, offs);
  }
  
--- 2000,2005 ----
Index: symfile.c
===================================================================
RCS file: /cvs/src/src/gdb/symfile.c,v
retrieving revision 1.124
diff -c -r1.124 symfile.c
*** symfile.c	28 Feb 2004 18:04:37 -0000	1.124
--- symfile.c	14 Mar 2004 21:22:52 -0000
***************
*** 393,398 ****
--- 393,402 ----
    if (sect) 
      objfile->sect_index_text = sect->index;
  
+   sect = bfd_get_section_by_name (objfile->obfd, ".plt");
+   if (sect) 
+     objfile->sect_index_plt = sect->index;
+ 
    sect = bfd_get_section_by_name (objfile->obfd, ".data");
    if (sect) 
      objfile->sect_index_data = sect->index;
***************
*** 426,431 ****
--- 430,437 ----
      {
        if (objfile->sect_index_text == -1)
  	objfile->sect_index_text = 0;
+       if (objfile->sect_index_plt == -1)
+ 	objfile->sect_index_plt = 0;
        if (objfile->sect_index_data == -1)
  	objfile->sect_index_data = 0;
        if (objfile->sect_index_bss == -1)
>Release-Note:
>Audit-Trail:
>Unformatted:
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