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gdb/gdb-6.3-bz140532-ppc-unwinding-fix.patch

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- Update PPC unwinding patches to their upstream variants (BZ 140532).
2007-08-06 00:24:32 +00:00
2007-02-08 Joel Brobecker <brobecker@gnat.com>
Jan Kratochvil <jan.kratochvil@redhat.com>
Daniel Jacobowitz <dan@codesourcery.com>
* rs6000-tdep.c (bl_to_blrl_insn_p): New function.
(skip_prologue): Allow bl->blrl used by PIC code.
--- ./gdb/rs6000-tdep.c 9 Jan 2007 17:58:57 -0000 1.260
+++ ./gdb/rs6000-tdep.c 8 Feb 2007 14:22:53 -0000 1.261
@@ -902,6 +902,30 @@ store_param_on_stack_p (unsigned long op
return 0;
}
+/* Assuming that INSN is a "bl" instruction located at PC, return
+ nonzero if the destination of the branch is a "blrl" instruction.
+
+ This sequence is sometimes found in certain function prologues.
+ It allows the function to load the LR register with a value that
+ they can use to access PIC data using PC-relative offsets. */
+
+static int
+bl_to_blrl_insn_p (CORE_ADDR pc, int insn)
+{
+ const int opcode = 18;
+ const CORE_ADDR dest = branch_dest (opcode, insn, pc, -1);
+ int dest_insn;
+
+ if (dest == -1)
+ return 0; /* Should never happen, but just return zero to be safe. */
+
+ dest_insn = read_memory_integer (dest, 4);
+ if ((dest_insn & 0xfc00ffff) == 0x4c000021) /* blrl */
+ return 1;
+
+ return 0;
+}
+
static CORE_ADDR
skip_prologue (CORE_ADDR pc, CORE_ADDR lim_pc, struct rs6000_framedata *fdata)
{
@@ -1133,6 +1157,12 @@ skip_prologue (CORE_ADDR pc, CORE_ADDR l
to save fprs??? */
fdata->frameless = 0;
+
+ /* If the return address has already been saved, we can skip
+ calls to blrl (for PIC). */
+ if (lr_reg != -1 && bl_to_blrl_insn_p (pc, op))
+ continue;
+
/* Don't skip over the subroutine call if it is not within
the first three instructions of the prologue and either
we have no line table information or the line info tells
2007-03-27 Andreas Schwab <schwab@suse.de>
Daniel Jacobowitz <dan@codesourcery.com>
* dwarf2-frame.c (dwarf2_frame_eh_frame_regnum): Rename to...
(dwarf2_frame_adjust_regnum): ...this. Make static. Add eh_frame_p
argument. Update all callers.
(struct dwarf2_frame_ops): Replace eh_frame_regnum with adjust_regnum.
(dwarf2_frame_set_eh_frame_regnum): Rename to...
(dwarf2_frame_set_adjust_regnum): ...this. Update argument type.
* dwarf2frame.h (dwarf2_frame_set_eh_frame_regnum): Rename to...
(dwarf2_frame_set_adjust_regnum): ...this.
(dwarf2_frame_eh_frame_regnum): Delete prototype.
* rs6000-tdep.c: Include "dwarf2-frame.h".
(rs6000_adjust_frame_regnum): Define.
(rs6000_gdbarch_init): Enable use of DWARF CFI frame unwinder.
Register rs6000_adjust_frame_regnum.
* Makefile.in (rs6000-tdep.o): Update dependencies.
--- ./gdb/dwarf2-frame.c 27 Feb 2007 20:17:18 -0000 1.68
+++ ./gdb/dwarf2-frame.c 27 Mar 2007 19:02:42 -0000 1.69
@@ -107,6 +107,9 @@ struct dwarf2_fde
};
static struct dwarf2_fde *dwarf2_frame_find_fde (CORE_ADDR *pc);
+
+static int dwarf2_frame_adjust_regnum (struct gdbarch *gdbarch, int regnum,
+ int eh_frame_p);
/* Structure describing a frame state. */
@@ -314,8 +317,7 @@ execute_cfa_program (gdb_byte *insn_ptr,
else if ((insn & 0xc0) == DW_CFA_offset)
{
reg = insn & 0x3f;
- if (eh_frame_p)
- reg = dwarf2_frame_eh_frame_regnum (gdbarch, reg);
+ reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p);
insn_ptr = read_uleb128 (insn_ptr, insn_end, &utmp);
offset = utmp * fs->data_align;
dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
@@ -326,8 +328,7 @@ execute_cfa_program (gdb_byte *insn_ptr,
{
gdb_assert (fs->initial.reg);
reg = insn & 0x3f;
- if (eh_frame_p)
- reg = dwarf2_frame_eh_frame_regnum (gdbarch, reg);
+ reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p);
dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
if (reg < fs->initial.num_regs)
fs->regs.reg[reg] = fs->initial.reg[reg];
@@ -368,8 +369,7 @@ register %s (#%d) at 0x%s"),
case DW_CFA_offset_extended:
insn_ptr = read_uleb128 (insn_ptr, insn_end, &reg);
- if (eh_frame_p)
- reg = dwarf2_frame_eh_frame_regnum (gdbarch, reg);
+ reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p);
insn_ptr = read_uleb128 (insn_ptr, insn_end, &utmp);
offset = utmp * fs->data_align;
dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
@@ -380,35 +380,30 @@ register %s (#%d) at 0x%s"),
case DW_CFA_restore_extended:
gdb_assert (fs->initial.reg);
insn_ptr = read_uleb128 (insn_ptr, insn_end, &reg);
- if (eh_frame_p)
- reg = dwarf2_frame_eh_frame_regnum (gdbarch, reg);
+ reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p);
dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
fs->regs.reg[reg] = fs->initial.reg[reg];
break;
case DW_CFA_undefined:
insn_ptr = read_uleb128 (insn_ptr, insn_end, &reg);
- if (eh_frame_p)
- reg = dwarf2_frame_eh_frame_regnum (gdbarch, reg);
+ reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p);
dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
fs->regs.reg[reg].how = DWARF2_FRAME_REG_UNDEFINED;
break;
case DW_CFA_same_value:
insn_ptr = read_uleb128 (insn_ptr, insn_end, &reg);
- if (eh_frame_p)
- reg = dwarf2_frame_eh_frame_regnum (gdbarch, reg);
+ reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p);
dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAME_VALUE;
break;
case DW_CFA_register:
insn_ptr = read_uleb128 (insn_ptr, insn_end, &reg);
- if (eh_frame_p)
- reg = dwarf2_frame_eh_frame_regnum (gdbarch, reg);
+ reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p);
insn_ptr = read_uleb128 (insn_ptr, insn_end, &utmp);
- if (eh_frame_p)
- utmp = dwarf2_frame_eh_frame_regnum (gdbarch, utmp);
+ utmp = dwarf2_frame_adjust_regnum (gdbarch, utmp, eh_frame_p);
dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_REG;
fs->regs.reg[reg].loc.reg = utmp;
@@ -456,9 +451,8 @@ bad CFI data; mismatched DW_CFA_restore_
case DW_CFA_def_cfa_register:
insn_ptr = read_uleb128 (insn_ptr, insn_end, &fs->cfa_reg);
- if (eh_frame_p)
- fs->cfa_reg = dwarf2_frame_eh_frame_regnum (gdbarch,
- fs->cfa_reg);
+ fs->cfa_reg = dwarf2_frame_adjust_regnum (gdbarch, fs->cfa_reg,
+ eh_frame_p);
fs->cfa_how = CFA_REG_OFFSET;
break;
@@ -484,8 +478,7 @@ bad CFI data; mismatched DW_CFA_restore_
case DW_CFA_expression:
insn_ptr = read_uleb128 (insn_ptr, insn_end, &reg);
- if (eh_frame_p)
- reg = dwarf2_frame_eh_frame_regnum (gdbarch, reg);
+ reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p);
dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
insn_ptr = read_uleb128 (insn_ptr, insn_end, &utmp);
fs->regs.reg[reg].loc.exp = insn_ptr;
@@ -496,8 +489,7 @@ bad CFI data; mismatched DW_CFA_restore_
case DW_CFA_offset_extended_sf:
insn_ptr = read_uleb128 (insn_ptr, insn_end, &reg);
- if (eh_frame_p)
- reg = dwarf2_frame_eh_frame_regnum (gdbarch, reg);
+ reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p);
insn_ptr = read_sleb128 (insn_ptr, insn_end, &offset);
offset *= fs->data_align;
dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
@@ -535,9 +527,8 @@ bad CFI data; mismatched DW_CFA_restore_
case DW_CFA_def_cfa_sf:
insn_ptr = read_uleb128 (insn_ptr, insn_end, &fs->cfa_reg);
- if (eh_frame_p)
- fs->cfa_reg = dwarf2_frame_eh_frame_regnum (gdbarch,
- fs->cfa_reg);
+ fs->cfa_reg = dwarf2_frame_adjust_regnum (gdbarch, fs->cfa_reg,
+ eh_frame_p);
insn_ptr = read_sleb128 (insn_ptr, insn_end, &offset);
fs->cfa_offset = offset * fs->data_align;
fs->cfa_how = CFA_REG_OFFSET;
@@ -581,6 +572,7 @@ bad CFI data; mismatched DW_CFA_restore_
case DW_CFA_GNU_negative_offset_extended:
insn_ptr = read_uleb128 (insn_ptr, insn_end, &reg);
+ reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p);
insn_ptr = read_uleb128 (insn_ptr, insn_end, &offset);
offset *= fs->data_align;
dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
@@ -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
+ 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;
--- ./gdb/dwarf2-frame.h 9 Jan 2007 17:58:50 -0000 1.14
+++ ./gdb/dwarf2-frame.h 27 Mar 2007 19:02:42 -0000 1.15
@@ -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. */
--- ./gdb/rs6000-tdep.c 13 Mar 2007 17:34:22 -0000 1.266
+++ ./gdb/rs6000-tdep.c 27 Mar 2007 19:02:42 -0000 1.267
@@ -40,6 +40,7 @@
#include "sim-regno.h"
#include "gdb/sim-ppc.h"
#include "reggroups.h"
+#include "dwarf2-frame.h"
#include "libbfd.h" /* for bfd_default_set_arch_mach */
#include "coff/internal.h" /* for libcoff.h */
@@ -2294,6 +2295,69 @@ rs6000_dwarf2_reg_to_regnum (int num)
}
}
+/* Translate a .eh_frame register to DWARF register, or adjust a
+ .debug_frame register. */
+
+static int
+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 */
+ return num - 68 + 86;
+ else if (77 <= num && num <= 108) /* vr0-vr31 */
+ return num - 77 + 1124;
+ else
+ switch (num)
+ {
+ case 64: /* mq */
+ return 100;
+ case 65: /* lr */
+ return 108;
+ case 66: /* ctr */
+ return 109;
+ case 76: /* xer */
+ return 101;
+ case 109: /* vrsave */
+ return 356;
+ case 110: /* vscr */
+ return 67;
+ case 111: /* spe_acc */
+ return 99;
+ case 112: /* spefscr */
+ return 612;
+ default:
+ return num;
+ }
+}
/* Support for CONVERT_FROM_FUNC_PTR_ADDR (ARCH, ADDR, TARG).
@@ -3428,6 +3492,10 @@ 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_adjust_regnum (gdbarch, rs6000_adjust_frame_regnum);
+
/* Hook in ABI-specific overrides, if they have been registered. */
gdbarch_init_osabi (info, gdbarch);
--- ./gdb/Makefile.in.orig 2007-07-31 16:42:29.000000000 -0400
+++ ./gdb/Makefile.in 2007-08-01 13:42:51.000000000 -0400
@@ -2468,7 +2468,7 @@ rs6000-tdep.o: rs6000-tdep.c $(defs_h) $
$(reggroups_h) $(libbfd_h) $(coff_internal_h) $(libcoff_h) \
$(coff_xcoff_h) $(libxcoff_h) $(elf_bfd_h) $(solib_svr4_h) \
$(ppc_tdep_h) $(gdb_assert_h) $(dis_asm_h) $(trad_frame_h) \
- $(frame_unwind_h) $(frame_base_h) $(rs6000_tdep_h)
+ $(frame_unwind_h) $(frame_base_h) $(rs6000_tdep_h) $(dwarf2_frame_h)
rs6000-aix-tdep.o: rs6000-aix-tdep.c $(defs_h) $(osabi_h) $(rs6000_tdep_h)
s390-nat.o: s390-nat.c $(defs_h) $(tm_h) $(regcache_h) $(inferior_h) \
$(s390_tdep_h) $(observer_h) $(linux_nat_h)
s390-tdep.o: s390-tdep.c $(defs_h) $(arch_utils_h) $(frame_h) $(inferior_h) \
2007-04-10 Andreas Schwab <schwab@suse.de>
* rs6000-tdep.c (rs6000_dwarf2_reg_to_regnum): Decode 64 as CR
register.
--- ./gdb/rs6000-tdep.c 1 Apr 2007 18:24:59 -0000 1.269
+++ ./gdb/rs6000-tdep.c 10 Apr 2007 16:02:41 -0000 1.270
@@ -2274,6 +2274,8 @@ rs6000_dwarf2_reg_to_regnum (int num)
else
switch (num)
{
+ case 64:
+ return tdep->ppc_cr_regnum;
case 67:
return tdep->ppc_vrsave_regnum - 1; /* vscr */
case 99:
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