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- Fix unwinding of non-CFI (w/o debuginfo) PPC code by recent GCC (BZ 

140532).
- Related: rhbz#140532
This commit is contained in:
Jan Kratochvil 2007-01-12 21:07:47 +00:00
parent 3cdd4d2bbe
commit 48f079c103
2 changed files with 60 additions and 1 deletions
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52
gdb-6.3-bz140532-ppcnoncfi-skip_prologue-PIC.patch Normal file
View File

@ -0,0 +1,52 @@
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=140532
2007-01-01 Jan Kratochvil <jan.kratochvil@redhat.com>
* rs6000-tdep.c (skip_prologue): Handle bl->brlr used by PIC code.
diff -u -rup gdb-6.5-orig/gdb/rs6000-tdep.c gdb-6.5/gdb/rs6000-tdep.c
--- gdb-6.5-orig/gdb/rs6000-tdep.c 2006-12-30 15:53:52.000000000 -0500
+++ gdb-6.5/gdb/rs6000-tdep.c 2006-12-31 19:06:28.000000000 -0500
@@ -1182,6 +1182,40 @@ skip_prologue (CORE_ADDR pc, CORE_ADDR l
else if ((op & 0xfc000001) == 0x48000001)
{ /* bl foo,
to save fprs??? */
+ CORE_ADDR bl_target;
+ gdb_byte bl_target_op_buf[4];
+
+ /* Safely skip:
+ prologue: ...
+ bl addr
+ ...
+ addr: blrl
+ as it could break the prologue by `prologue_sal.line'
+ or `prologue_sal.line != this_sal.line' conditions below. */
+ /* Sign-extend it to the upper 6 bits. */
+ if (op & 0x02000000)
+ bl_target = pc + -(long) (((~op) & 0x03fffffc) + 4);
+ else
+ bl_target = pc + (op & 0x03fffffc);
+ if (target_read_memory (bl_target, bl_target_op_buf, 4) == 0)
+ {
+ unsigned long bl_target_op;
+
+ bl_target_op = extract_signed_integer (bl_target_op_buf, 4);
+ if (bl_target_op == 0x4e800021) /* blrl */
+ {
+ /* If we did not yet retrieved LR into some GPR
+ all our chances are lost. On the other hand already
+ stored LR is still kept intact in its GPR. */
+ if (lr_reg == -1)
+ {
+ /* Invalidate lr_reg, but don't set it to -1.
+ That would mean that it had never been set. */
+ lr_reg = -2;
+ }
+ continue;
+ }
+ }
fdata->frameless = 0;
/* Don't skip over the subroutine call if it is not within

9
gdb.spec
View File

@ -11,7 +11,7 @@ Name: gdb
Version: 6.5
# The release always contains a leading reserved number, start it at 0.
Release: 24%{?dist}
Release: 25%{?dist}
License: GPL
Group: Development/Debuggers
@ -322,6 +322,9 @@ Patch222: gdb-6.5-bz165025-DW_CFA_GNU_negative_offset_extended-test.patch
Patch224: gdb-6.5-bz109921-DW_AT_decl_file-fix.patch
Patch225: gdb-6.5-bz109921-DW_AT_decl_file-test.patch
# Fix unwinding of non-CFI (w/o debuginfo) PPC code by recent GCC (BZ 140532).
Patch226: gdb-6.3-bz140532-ppcnoncfi-skip_prologue-PIC.patch
BuildRequires: ncurses-devel glibc-devel gcc make gzip texinfo dejagnu gettext
BuildRequires: flex bison sharutils
@ -451,6 +454,7 @@ and printing their data.
%patch222 -p1
%patch224 -p1
%patch225 -p1
%patch226 -p1
# Change the version that gets printed at GDB startup, so it is RedHat
# specific.
@ -613,6 +617,9 @@ fi
# don't include the files in include, they are part of binutils
%changelog
* Fri Jan 12 2007 Jan Kratochvil <jan.kratochvil@redhat.com> - 6.5-25
- Fix unwinding of non-CFI (w/o debuginfo) PPC code by recent GCC (BZ 140532).
* Thu Jan 11 2007 Jan Kratochvil <jan.kratochvil@redhat.com> - 6.5-24
- Backport readline history for input mode commands like `command' (BZ 215816).