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@ -1,3 +1,9 @@
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-------------------------------------------------------------------
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Mon Mar 12 18:07:07 CET 2007 - schwab@suse.de
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- Update ppc DWARF patch to also handle broken debug info from old
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compilers.
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-------------------------------------------------------------------
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Thu Mar 8 15:04:28 CET 2007 - schwab@suse.de
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7
gdb.spec
7
gdb.spec
@ -21,7 +21,7 @@ Group: Development/Tools/Debuggers
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Autoreqprov: on
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PreReq: %{install_info_prereq}
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Version: 6.6
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Release: 16
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Release: 18
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Summary: The GNU Debugger
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Source: gdb-%{version}.tar.bz2
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Patch1: gdb-misc.patch
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@ -74,7 +74,9 @@ Authors:
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%patch3
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%patch4
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%patch5
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cd gdb
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%patch7
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cd ..
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%patch8
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%patch9
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%patch10
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@ -145,6 +147,9 @@ rm -rf $RPM_BUILD_ROOT
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%endif
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%changelog
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* Mon Mar 12 2007 - schwab@suse.de
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- Update ppc DWARF patch to also handle broken debug info from old
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compilers.
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* Thu Mar 08 2007 - schwab@suse.de
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- Deal with stepping over sequence of atomic insns [#154486].
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* Wed Mar 07 2007 - schwab@suse.de
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@ -1,16 +1,323 @@
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--- gdb/Makefile.in
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+++ gdb/Makefile.in
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@@ -2538,7 +2538,7 @@
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From nobody Mon Mar 12 17:19:12 2007
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From: Daniel Jacobowitz <drow@false.org>
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Subject: Enable CFI for PowerPC, try 3
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To: gdb-patches@sourceware.org
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Date: Mon, 12 Mar 2007 12:12:19 -0400
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Mail-Followup-To: gdb-patches@sourceware.org
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The last two times that we (Jim B, and then Andreas) tried to enable
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PowerPC CFI, we ran into problems with GCC. It used to emit bogus
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unwind tables. This has since been fixed - see the comment in the
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patch below for the gory details - but if you get it wrong it's such a
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messy and terrible outcome. So here's some workarounds.
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+ /* GCC releases before 3.4 use GCC internal register numbering in
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+ .debug_frame (and .debug_info, et cetera). The numbering is
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+ different from the standard SysV numbering for everything except
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+ for GPRs and FPRs. We can not detect this problem in most cases
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+ - to get accurate debug info for variables living in lr, ctr, v0,
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+ et cetera, use a newer version of GCC. But we must detect
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+ one important case - lr is in column 65 in .debug_frame output,
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+ instead of 108.
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+
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+ GCC 3.4, and the "hammer" branch, have a related problem. They
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+ record lr register saves in .debug_frame as 108, but still record
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+ the return column as 65. We fix that up too.
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+
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+ We can do this because 65 is assigned to fpsr, and GCC never
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+ generates debug info referring to it. To add support for
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+ handwritten debug info that restores fpsr, we would need to add a
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+ producer version check to this. */
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I tested this, before and after, with GCC 3.3.6, 3.4.4, and 4.1.1. It
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fixed 23, 24, and 25 failures respectively - most notably we can now
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backtrace out of glibc in tls.exp. The others may be weaknesses in
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the prologue analyzer - I didn't look deeply.
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I also verified that with CFI, but without the rest of the workaround,
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GCC 3.4.4 is unhappy.
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Any comments? And would anyone else like to try this patch before I
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check it in?
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--
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Daniel Jacobowitz
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CodeSourcery
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2007-03-12 Andreas Schwab <schwab@suse.de>
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Daniel Jacobowitz <dan@codesourcery.com>
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* dwarf2-frame.c (dwarf2_frame_eh_frame_regnum): Rename to...
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(dwarf2_frame_adjust_regnum): ...this. Make static. Add eh_frame_p
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argument. Update all callers.
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(struct dwarf2_frame_ops): Replace eh_frame_regnum with adjust_regnum.
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(dwarf2_frame_set_eh_frame_regnum): Rename to...
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(dwarf2_frame_set_adjust_regnum): ...this. Update argument type.
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* dwarf2frame.h (dwarf2_frame_set_eh_frame_regnum): Rename to...
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(dwarf2_frame_set_adjust_regnum): ...this.
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(dwarf2_frame_eh_frame_regnum): Delete prototype.
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* rs6000-tdep.c: Include "dwarf2-frame.h".
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(rs6000_adjust_frame_regnum): Define.
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(rs6000_gdbarch_init): Enable use of DWARF CFI frame unwinder.
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Register rs6000_adjust_frame_regnum.
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* Makefile.in (rs6000-tdep.o): Update dependencies.
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Index: Makefile.in
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===================================================================
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RCS file: /home/gcc/repos/src/src/gdb/Makefile.in,v
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retrieving revision 1.883
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diff -u -p -r1.883 Makefile.in
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--- Makefile.in 2 Mar 2007 21:28:18 -0000 1.883
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+++ Makefile.in 12 Mar 2007 12:23:24 -0000
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@@ -2584,7 +2584,7 @@ rs6000-tdep.o: rs6000-tdep.c $(defs_h) $
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$(reggroups_h) $(libbfd_h) $(coff_internal_h) $(libcoff_h) \
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$(coff_xcoff_h) $(libxcoff_h) $(elf_bfd_h) $(solib_svr4_h) \
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$(ppc_tdep_h) $(gdb_assert_h) $(dis_asm_h) $(trad_frame_h) \
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- $(frame_unwind_h) $(frame_base_h) $(rs6000_tdep_h)
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+ $(frame_unwind_h) $(frame_base_h) $(rs6000_tdep_h) $(dwarf2_frame_h)
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rs6000-aix-tdep.o: rs6000-aix-tdep.c $(defs_h) $(osabi_h) $(rs6000_tdep_h)
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s390-nat.o: s390-nat.c $(defs_h) $(tm_h) $(regcache_h) $(inferior_h) \
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s390-nat.o: s390-nat.c $(defs_h) $(regcache_h) $(inferior_h) \
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$(s390_tdep_h) $(target_h) $(linux_nat_h)
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--- gdb/rs6000-tdep.c
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+++ gdb/rs6000-tdep.c
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Index: dwarf2-frame.c
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===================================================================
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RCS file: /home/gcc/repos/src/src/gdb/dwarf2-frame.c,v
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retrieving revision 1.68
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diff -u -p -r1.68 dwarf2-frame.c
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--- dwarf2-frame.c 27 Feb 2007 20:17:18 -0000 1.68
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+++ dwarf2-frame.c 12 Mar 2007 13:36:31 -0000
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@@ -107,6 +107,9 @@ struct dwarf2_fde
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};
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static struct dwarf2_fde *dwarf2_frame_find_fde (CORE_ADDR *pc);
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+
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+static int dwarf2_frame_adjust_regnum (struct gdbarch *gdbarch, int regnum,
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+ int eh_frame_p);
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/* Structure describing a frame state. */
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@@ -314,8 +317,7 @@ execute_cfa_program (gdb_byte *insn_ptr,
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else if ((insn & 0xc0) == DW_CFA_offset)
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{
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reg = insn & 0x3f;
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- if (eh_frame_p)
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- reg = dwarf2_frame_eh_frame_regnum (gdbarch, reg);
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+ reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p);
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insn_ptr = read_uleb128 (insn_ptr, insn_end, &utmp);
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offset = utmp * fs->data_align;
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dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
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@@ -326,8 +328,7 @@ execute_cfa_program (gdb_byte *insn_ptr,
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{
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gdb_assert (fs->initial.reg);
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reg = insn & 0x3f;
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- if (eh_frame_p)
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- reg = dwarf2_frame_eh_frame_regnum (gdbarch, reg);
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+ reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p);
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dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
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if (reg < fs->initial.num_regs)
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fs->regs.reg[reg] = fs->initial.reg[reg];
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@@ -368,8 +369,7 @@ register %s (#%d) at 0x%s"),
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case DW_CFA_offset_extended:
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insn_ptr = read_uleb128 (insn_ptr, insn_end, ®);
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- if (eh_frame_p)
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- reg = dwarf2_frame_eh_frame_regnum (gdbarch, reg);
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+ reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p);
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insn_ptr = read_uleb128 (insn_ptr, insn_end, &utmp);
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offset = utmp * fs->data_align;
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dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
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@@ -380,35 +380,30 @@ register %s (#%d) at 0x%s"),
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case DW_CFA_restore_extended:
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gdb_assert (fs->initial.reg);
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insn_ptr = read_uleb128 (insn_ptr, insn_end, ®);
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- if (eh_frame_p)
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- reg = dwarf2_frame_eh_frame_regnum (gdbarch, reg);
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+ reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p);
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dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
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fs->regs.reg[reg] = fs->initial.reg[reg];
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break;
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case DW_CFA_undefined:
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insn_ptr = read_uleb128 (insn_ptr, insn_end, ®);
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- if (eh_frame_p)
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- reg = dwarf2_frame_eh_frame_regnum (gdbarch, reg);
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+ reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p);
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dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
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fs->regs.reg[reg].how = DWARF2_FRAME_REG_UNDEFINED;
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break;
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case DW_CFA_same_value:
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insn_ptr = read_uleb128 (insn_ptr, insn_end, ®);
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- if (eh_frame_p)
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- reg = dwarf2_frame_eh_frame_regnum (gdbarch, reg);
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+ reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p);
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dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
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fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAME_VALUE;
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break;
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case DW_CFA_register:
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insn_ptr = read_uleb128 (insn_ptr, insn_end, ®);
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- if (eh_frame_p)
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- reg = dwarf2_frame_eh_frame_regnum (gdbarch, reg);
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+ reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p);
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insn_ptr = read_uleb128 (insn_ptr, insn_end, &utmp);
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- if (eh_frame_p)
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- utmp = dwarf2_frame_eh_frame_regnum (gdbarch, utmp);
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+ utmp = dwarf2_frame_adjust_regnum (gdbarch, utmp, eh_frame_p);
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dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
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fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_REG;
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fs->regs.reg[reg].loc.reg = utmp;
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@@ -456,9 +451,8 @@ bad CFI data; mismatched DW_CFA_restore_
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case DW_CFA_def_cfa_register:
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insn_ptr = read_uleb128 (insn_ptr, insn_end, &fs->cfa_reg);
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- if (eh_frame_p)
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- fs->cfa_reg = dwarf2_frame_eh_frame_regnum (gdbarch,
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- fs->cfa_reg);
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+ fs->cfa_reg = dwarf2_frame_adjust_regnum (gdbarch, fs->cfa_reg,
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+ eh_frame_p);
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fs->cfa_how = CFA_REG_OFFSET;
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break;
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@@ -484,8 +478,7 @@ bad CFI data; mismatched DW_CFA_restore_
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case DW_CFA_expression:
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insn_ptr = read_uleb128 (insn_ptr, insn_end, ®);
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- if (eh_frame_p)
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- reg = dwarf2_frame_eh_frame_regnum (gdbarch, reg);
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+ reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p);
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dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
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insn_ptr = read_uleb128 (insn_ptr, insn_end, &utmp);
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fs->regs.reg[reg].loc.exp = insn_ptr;
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@@ -496,8 +489,7 @@ bad CFI data; mismatched DW_CFA_restore_
|
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case DW_CFA_offset_extended_sf:
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insn_ptr = read_uleb128 (insn_ptr, insn_end, ®);
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- if (eh_frame_p)
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- reg = dwarf2_frame_eh_frame_regnum (gdbarch, reg);
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+ reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p);
|
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insn_ptr = read_sleb128 (insn_ptr, insn_end, &offset);
|
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offset *= fs->data_align;
|
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dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
|
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@@ -535,9 +527,8 @@ bad CFI data; mismatched DW_CFA_restore_
|
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|
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case DW_CFA_def_cfa_sf:
|
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insn_ptr = read_uleb128 (insn_ptr, insn_end, &fs->cfa_reg);
|
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- if (eh_frame_p)
|
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- fs->cfa_reg = dwarf2_frame_eh_frame_regnum (gdbarch,
|
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- fs->cfa_reg);
|
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+ fs->cfa_reg = dwarf2_frame_adjust_regnum (gdbarch, fs->cfa_reg,
|
||||
+ eh_frame_p);
|
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insn_ptr = read_sleb128 (insn_ptr, insn_end, &offset);
|
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fs->cfa_offset = offset * fs->data_align;
|
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fs->cfa_how = CFA_REG_OFFSET;
|
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@@ -617,8 +607,9 @@ struct dwarf2_frame_ops
|
||||
trampoline. */
|
||||
int (*signal_frame_p) (struct gdbarch *, struct frame_info *);
|
||||
|
||||
- /* Convert .eh_frame register number to DWARF register number. */
|
||||
- int (*eh_frame_regnum) (struct gdbarch *, int);
|
||||
+ /* Convert .eh_frame register number to DWARF register number, or
|
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+ adjust .debug_frame register number. */
|
||||
+ int (*adjust_regnum) (struct gdbarch *, int, int);
|
||||
};
|
||||
|
||||
/* Default architecture-specific register state initialization
|
||||
@@ -726,29 +717,30 @@ dwarf2_frame_signal_frame_p (struct gdba
|
||||
return ops->signal_frame_p (gdbarch, next_frame);
|
||||
}
|
||||
|
||||
-/* Set the architecture-specific mapping of .eh_frame register numbers to
|
||||
- DWARF register numbers. */
|
||||
+/* Set the architecture-specific adjustment of .eh_frame and .debug_frame
|
||||
+ register numbers. */
|
||||
|
||||
void
|
||||
-dwarf2_frame_set_eh_frame_regnum (struct gdbarch *gdbarch,
|
||||
- int (*eh_frame_regnum) (struct gdbarch *,
|
||||
- int))
|
||||
+dwarf2_frame_set_adjust_regnum (struct gdbarch *gdbarch,
|
||||
+ int (*adjust_regnum) (struct gdbarch *,
|
||||
+ int, int))
|
||||
{
|
||||
struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data);
|
||||
|
||||
- ops->eh_frame_regnum = eh_frame_regnum;
|
||||
+ ops->adjust_regnum = adjust_regnum;
|
||||
}
|
||||
|
||||
-/* Translate a .eh_frame register to DWARF register. */
|
||||
+/* Translate a .eh_frame register to DWARF register, or adjust a .debug_frame
|
||||
+ register. */
|
||||
|
||||
-int
|
||||
-dwarf2_frame_eh_frame_regnum (struct gdbarch *gdbarch, int regnum)
|
||||
+static int
|
||||
+dwarf2_frame_adjust_regnum (struct gdbarch *gdbarch, int regnum, int eh_frame_p)
|
||||
{
|
||||
struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data);
|
||||
|
||||
- if (ops->eh_frame_regnum == NULL)
|
||||
+ if (ops->adjust_regnum == NULL)
|
||||
return regnum;
|
||||
- return ops->eh_frame_regnum (gdbarch, regnum);
|
||||
+ return ops->adjust_regnum (gdbarch, regnum, eh_frame_p);
|
||||
}
|
||||
|
||||
static void
|
||||
@@ -1726,10 +1718,10 @@ decode_frame_entry_1 (struct comp_unit *
|
||||
else
|
||||
cie->return_address_register = read_unsigned_leb128 (unit->abfd, buf,
|
||||
&bytes_read);
|
||||
- if (eh_frame_p)
|
||||
- cie->return_address_register
|
||||
- = dwarf2_frame_eh_frame_regnum (current_gdbarch,
|
||||
- cie->return_address_register);
|
||||
+ cie->return_address_register
|
||||
+ = dwarf2_frame_adjust_regnum (current_gdbarch,
|
||||
+ cie->return_address_register,
|
||||
+ eh_frame_p);
|
||||
|
||||
buf += bytes_read;
|
||||
|
||||
Index: dwarf2-frame.h
|
||||
===================================================================
|
||||
RCS file: /home/gcc/repos/src/src/gdb/dwarf2-frame.h,v
|
||||
retrieving revision 1.14
|
||||
diff -u -p -r1.14 dwarf2-frame.h
|
||||
--- dwarf2-frame.h 9 Jan 2007 17:58:50 -0000 1.14
|
||||
+++ dwarf2-frame.h 12 Mar 2007 13:26:48 -0000
|
||||
@@ -94,18 +94,13 @@ extern void
|
||||
int (*signal_frame_p) (struct gdbarch *,
|
||||
struct frame_info *));
|
||||
|
||||
-/* Set the architecture-specific mapping of .eh_frame register numbers to
|
||||
- DWARF register numbers. */
|
||||
+/* Set the architecture-specific adjustment of .eh_frame and .debug_frame
|
||||
+ register numbers. */
|
||||
|
||||
extern void
|
||||
- dwarf2_frame_set_eh_frame_regnum (struct gdbarch *gdbarch,
|
||||
- int (*eh_frame_regnum) (struct gdbarch *,
|
||||
- int));
|
||||
-
|
||||
-/* Translate a .eh_frame register to DWARF register. */
|
||||
-
|
||||
-extern int
|
||||
- dwarf2_frame_eh_frame_regnum (struct gdbarch *gdbarch, int regnum);
|
||||
+ dwarf2_frame_set_adjust_regnum (struct gdbarch *gdbarch,
|
||||
+ int (*adjust_regnum) (struct gdbarch *,
|
||||
+ int, int));
|
||||
|
||||
/* Return the frame unwind methods for the function that contains PC,
|
||||
or NULL if it can't be handled by DWARF CFI frame unwinder. */
|
||||
Index: rs6000-tdep.c
|
||||
===================================================================
|
||||
RCS file: /home/gcc/repos/src/src/gdb/rs6000-tdep.c,v
|
||||
retrieving revision 1.265
|
||||
diff -u -p -r1.265 rs6000-tdep.c
|
||||
--- rs6000-tdep.c 27 Feb 2007 23:04:28 -0000 1.265
|
||||
+++ rs6000-tdep.c 12 Mar 2007 13:36:01 -0000
|
||||
@@ -40,6 +40,7 @@
|
||||
#include "sim-regno.h"
|
||||
#include "gdb/sim-ppc.h"
|
||||
@ -19,14 +326,44 @@
|
||||
|
||||
#include "libbfd.h" /* for bfd_default_set_arch_mach */
|
||||
#include "coff/internal.h" /* for libcoff.h */
|
||||
@@ -2243,6 +2244,40 @@
|
||||
@@ -2211,6 +2212,70 @@ e500_pseudo_register_read (struct gdbarc
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
+/* Convert a .eh_frame register number to a Dwarf 2 register number. */
|
||||
+/* Translate a .eh_frame register to DWARF register, or adjust a
|
||||
+ .debug_frame register. */
|
||||
+
|
||||
+static int
|
||||
+rs6000_eh_frame_regnum (struct gdbarch *gdbarch, int num)
|
||||
+rs6000_adjust_frame_regnum (struct gdbarch *gdbarch, int num, int eh_frame_p)
|
||||
+{
|
||||
+ /* GCC releases before 3.4 use GCC internal register numbering in
|
||||
+ .debug_frame (and .debug_info, et cetera). The numbering is
|
||||
+ different from the standard SysV numbering for everything except
|
||||
+ for GPRs and FPRs. We can not detect this problem in most cases
|
||||
+ - to get accurate debug info for variables living in lr, ctr, v0,
|
||||
+ et cetera, use a newer version of GCC. But we must detect
|
||||
+ one important case - lr is in column 65 in .debug_frame output,
|
||||
+ instead of 108.
|
||||
+
|
||||
+ GCC 3.4, and the "hammer" branch, have a related problem. They
|
||||
+ record lr register saves in .debug_frame as 108, but still record
|
||||
+ the return column as 65. We fix that up too.
|
||||
+
|
||||
+ We can do this because 65 is assigned to fpsr, and GCC never
|
||||
+ generates debug info referring to it. To add support for
|
||||
+ handwritten debug info that restores fpsr, we would need to add a
|
||||
+ producer version check to this. */
|
||||
+ if (!eh_frame_p)
|
||||
+ {
|
||||
+ if (num == 65)
|
||||
+ return 108;
|
||||
+ else
|
||||
+ return num;
|
||||
+ }
|
||||
+
|
||||
+ /* .eh_frame is GCC specific. For binary compatibility, it uses GCC
|
||||
+ internal register numbering; translate that to the standard DWARF2
|
||||
+ register numbering. */
|
||||
+ if (0 <= num && num <= 63) /* r0-r31,fp0-fp31 */
|
||||
+ return num;
|
||||
+ else if (68 <= num && num <= 75) /* cr0-cr8 */
|
||||
@ -57,17 +394,18 @@
|
||||
+ }
|
||||
+}
|
||||
+
|
||||
|
||||
static void
|
||||
rs6000_store_return_value (struct type *type,
|
||||
struct regcache *regcache,
|
||||
@@ -3461,6 +3496,10 @@
|
||||
/* Helpers for function argument information. */
|
||||
set_gdbarch_fetch_pointer_argument (gdbarch, rs6000_fetch_pointer_argument);
|
||||
@@ -3471,6 +3536,10 @@ rs6000_gdbarch_init (struct gdbarch_info
|
||||
(gdbarch, rs6000_in_solib_return_trampoline);
|
||||
set_gdbarch_skip_trampoline_code (gdbarch, rs6000_skip_trampoline_code);
|
||||
|
||||
+ /* Hook in the DWARF CFI frame unwinder. */
|
||||
+ frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer);
|
||||
+ dwarf2_frame_set_eh_frame_regnum (gdbarch, rs6000_eh_frame_regnum);
|
||||
+ dwarf2_frame_set_adjust_regnum (gdbarch, rs6000_adjust_frame_regnum);
|
||||
+
|
||||
/* Hook in ABI-specific overrides, if they have been registered. */
|
||||
gdbarch_init_osabi (info, gdbarch);
|
||||
|
||||
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user