shlibs/2063: Unable to step into shared library

Mark Kettenis mark.kettenis@xs4all.nl
Sat Jan 7 19:18:00 GMT 2006


The following reply was made to PR shlibs/2063; it has been noted by GNATS.

From: Mark Kettenis <mark.kettenis@xs4all.nl>
To: steve@telxio.com
Cc: gdb-gnats@sources.redhat.com, steve.williams@utstar.com
Subject: Re: shlibs/2063: Unable to step into shared library
Date: Sat, 7 Jan 2006 20:14:17 +0100 (CET)

 > Date: 6 Jan 2006 01:09:09 -0000
 > From: steve@telxio.com
 
 > GDB fails to step into a shared library function on
 > Solaris10. Execution halts in _ti_bind_guard.
 
 Hmm, so things changed in Solaris10...
 
 > Attached is a patch that creates a Solaris2 specific shared library
 > dynamic symbol resolver. I did not know if the solib-svr4.c file
 > should be extended or whether a Solaris specific shared library file
 > should be created.
 
 Unfortunately that isn't the right approach; it's better to skip the
 resolver code completely.  Could you try the attached patch?  It works
 fine for me on Solaris 7.
 
 
 Index: sparc-sol2-tdep.c
 ===================================================================
 RCS file: /cvs/src/src/gdb/sparc-sol2-tdep.c,v
 retrieving revision 1.10
 diff -u -p -r1.10 sparc-sol2-tdep.c
 --- sparc-sol2-tdep.c	17 Dec 2005 22:34:02 -0000	1.10
 +++ sparc-sol2-tdep.c	7 Jan 2006 19:10:59 -0000
 @@ -1,6 +1,6 @@
  /* Target-dependent code for Solaris SPARC.
  
 -   Copyright (C) 2003, 2004 Free Software Foundation, Inc.
 +   Copyright (C) 2003, 2004, 2006 Free Software Foundation, Inc.
  
     This file is part of GDB.
  
 @@ -33,6 +33,7 @@
  #include "gdb_assert.h"
  #include "gdb_string.h"
  
 +#include "sol2-tdep.h"
  #include "sparc-tdep.h"
  #include "solib-svr4.h"
  
 @@ -178,6 +179,7 @@ sparc32_sol2_init_abi (struct gdbarch_in
  
    /* Solaris has SVR4-style shared libraries...  */
    set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
 +  set_gdbarch_skip_solib_resolver (gdbarch, sol2_skip_solib_resolver);
    set_solib_svr4_fetch_link_map_offsets
      (gdbarch, svr4_ilp32_fetch_link_map_offsets);
  
 Index: sparc-tdep.c
 ===================================================================
 RCS file: /cvs/src/src/gdb/sparc-tdep.c,v
 retrieving revision 1.166
 diff -u -p -r1.166 sparc-tdep.c
 --- sparc-tdep.c	17 Dec 2005 22:34:02 -0000	1.166
 +++ sparc-tdep.c	7 Jan 2006 19:11:00 -0000
 @@ -81,6 +81,7 @@ struct regset;
  #define X_IMM22(i) ((i) & 0x3fffff)
  #define X_OP3(i) (((i) >> 19) & 0x3f)
  #define X_RS1(i) (((i) >> 14) & 0x1f)
 +#define X_RS2(i) ((i) & 0x1f)
  #define X_I(i) (((i) >> 13) & 1)
  /* Sign extension macros.  */
  #define X_DISP22(i) ((X_IMM22 (i) ^ 0x200000) - 0x200000)
 @@ -1045,6 +1046,23 @@ sparc_analyze_control_transfer (CORE_ADD
        branch_p = 1;
        offset = 4 * X_DISP19 (insn);
      }
 +  else if (X_OP (insn) == 2 && X_OP3 (insn) == 0x3a)
 +    {
 +      if ((X_I (insn) == 0 && X_RS1 (insn) == 0 && X_RS2 (insn) == 0)
 +	  || (X_I (insn) == 1 && X_RS1 (insn) == 0 && (insn & 0x7f) == 0))
 +	{
 +	  /* OpenBSD system call.  */
 +	  ULONGEST number;
 +
 +	  regcache_cooked_read_unsigned (current_regcache,
 +					 SPARC_G1_REGNUM, &number);
 +
 +	  if (number & 0x400)
 +	    return sparc_address_from_register (SPARC_G2_REGNUM);
 +	  if (number & 0x800)
 +	    return sparc_address_from_register (SPARC_G7_REGNUM);
 +	}
 +    }
  
    /* FIXME: Handle DONE and RETRY instructions.  */
  
 Index: sparc64-linux-nat.c
 ===================================================================
 RCS file: /cvs/src/src/gdb/sparc64-linux-nat.c,v
 retrieving revision 1.4
 diff -u -p -r1.4 sparc64-linux-nat.c
 --- sparc64-linux-nat.c	17 Dec 2005 22:34:02 -0000	1.4
 +++ sparc64-linux-nat.c	7 Jan 2006 19:11:00 -0000
 @@ -47,6 +47,10 @@ void _initialize_sparc64_linux_nat (void
  void
  _initialize_sparc64_linux_nat (void)
  {
 +#ifndef __arch64__
 +# warning "You're building a 32-bit GDB on a system that claims to be 64-bit"
 +# warning "This GDB won't be able to debug 64-bit code"
 +#else
    struct target_ops *t;
  
    /* Fill in the generic GNU/Linux methods.  */
 @@ -60,4 +64,5 @@ _initialize_sparc64_linux_nat (void)
    add_target (t);
  
    sparc_gregset = &sparc64_linux_ptrace_gregset;
 +#endif
  }
 Index: sparc64-sol2-tdep.c
 ===================================================================
 RCS file: /cvs/src/src/gdb/sparc64-sol2-tdep.c,v
 retrieving revision 1.9
 diff -u -p -r1.9 sparc64-sol2-tdep.c
 --- sparc64-sol2-tdep.c	17 Dec 2005 22:34:02 -0000	1.9
 +++ sparc64-sol2-tdep.c	7 Jan 2006 19:11:00 -0000
 @@ -1,6 +1,6 @@
  /* Target-dependent code for Solaris UltraSPARC.
  
 -   Copyright (C) 2003, 2004 Free Software Foundation, Inc.
 +   Copyright (C) 2003, 2004, 2006 Free Software Foundation, Inc.
  
     This file is part of GDB.
  
 @@ -30,6 +30,7 @@
  
  #include "gdb_assert.h"
  
 +#include "sol2-tdep.h"
  #include "sparc64-tdep.h"
  #include "solib-svr4.h"
  
 @@ -160,6 +161,7 @@ sparc64_sol2_init_abi (struct gdbarch_in
  
    /* Solaris has SVR4-style shared libraries...  */
    set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
 +  set_gdbarch_skip_solib_resolver (gdbarch, sol2_skip_solib_resolver);
    set_solib_svr4_fetch_link_map_offsets
      (gdbarch, svr4_lp64_fetch_link_map_offsets);
  
 Index: config/sparc/sol2-64.mt
 ===================================================================
 RCS file: /cvs/src/src/gdb/config/sparc/sol2-64.mt,v
 retrieving revision 1.3
 diff -u -p -r1.3 sol2-64.mt
 --- config/sparc/sol2-64.mt	13 Sep 2004 20:55:42 -0000	1.3
 +++ config/sparc/sol2-64.mt	7 Jan 2006 19:11:00 -0000
 @@ -1,4 +1,4 @@
  # Target: Solaris UltraSPARC
  TDEPFILES= sparc64-tdep.o sparc64-sol2-tdep.o sparc-tdep.o sparc-sol2-tdep.o \
 -	solib.o solib-svr4.o
 +	sol2-tdep.o solib.o solib-svr4.o
  DEPRECATED_TM_FILE= tm-sol2.h
 Index: config/sparc/sol2.mt
 ===================================================================
 RCS file: /cvs/src/src/gdb/config/sparc/sol2.mt,v
 retrieving revision 1.4
 diff -u -p -r1.4 sol2.mt
 --- config/sparc/sol2.mt	13 Sep 2004 20:55:42 -0000	1.4
 +++ config/sparc/sol2.mt	7 Jan 2006 19:11:00 -0000
 @@ -1,3 +1,3 @@
  # Target: Solaris SPARC
 -TDEPFILES= sparc-tdep.o sparc-sol2-tdep.o solib.o solib-svr4.o
 +TDEPFILES= sparc-tdep.o sparc-sol2-tdep.o obsd-tdep.o solib.o solib-svr4.o
  DEPRECATED_TM_FILE= tm-sol2.h



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