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gdb/gdb-6.3-ppc64syscall-20040622.patch
Michael Matz e7db4ec014 - Rebase to 8.1 release: 
* ptype/o prints offsets and sizes of members (like pahole)
  * tab-completion improved: quoting function names is not generally
    necessary anymore, completion offers for breakpoint don't include
    data symbol
  * enable/disable breakpoints now accept ranges: 'disable 1.3-5'
  * new commands:
    - set/show cwd: working directory of debuggee
    - set/show compile-gcc: program to use for 'compile' command
    - starti: start program and stop at first instruction
    - TUI single-key commands: 'i' for stepi and 'o' for nexti
  * --readnever option disables any reading of debug info (for dumping)
  * s390: guarded storage register access for z14
  * gcore option -a dumps all memory mapping
  * C++ breakpoints: 'b foo' will now set a breakpoint on all functions
    and methods named 'foo' no matter the scope.  Use -qualified if you
    don't want that
  * python scripting: new events gdb.new_inferior, gdb.inferior_deleted
    and gdb.new_thread; new command rbreak (breakpoint accepting regexps)
  * gdbserver can be passed environment parameters to remote debuggee
- Added patches from Fedora:
  gdb-ppc64-stwux-tautological-compare.patch
  gdb-rhbz1540559-gdbaddindex-glibcdebug-regression.patch
  gdb-vla-intel-fix-print-char-array.patch
- Removed unused gdb-libstdc++-v3-python-7.1.1-20170526.tar.bz2
- Removed obsolete upstream patches:
  gdb-s390x-1b63490.patch
  gdb-s390x-289e23a.patch
  gdb-s390x-8fe09d7.patch
  gdb-s390x-96235dc.patch

OBS-URL: https://build.opensuse.org/package/show/devel:gcc/gdb?expand=0&rev=177
2018-03-09 16:46:37 +00:00

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From FEDORA_PATCHES Mon Sep 17 00:00:00 2001
From: Andrew Cagney <cagney@gnu.org>
Date: Fri, 27 Oct 2017 21:07:50 +0200
Subject: gdb-6.3-ppc64syscall-20040622.patch
FileName: gdb-6.3-ppc64syscall-20040622.patch
;; Better parse 64-bit PPC system call prologues.
;;=push: Write new testcase.
2004-06-22 Andrew Cagney <cagney@gnu.org>
* rs6000-tdep.c (struct rs6000_framedata): Add field "func_start".
(skip_prologue): Delete local variable "orig_pc", use
"func_start". Add local variable "num_skip_linux_syscall_insn",
use to skip over first half of a GNU/Linux syscall and update
"func_start".
---
gdb/rs6000-tdep.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++++++++---
1 file changed, 54 insertions(+), 3 deletions(-)
diff --git a/gdb/rs6000-tdep.c b/gdb/rs6000-tdep.c
index e5a265dbcb..23d0db3b8f 100644
--- a/gdb/rs6000-tdep.c
+++ b/gdb/rs6000-tdep.c
@@ -134,6 +134,7 @@ static const char *powerpc_vector_abi_string = "auto";
struct rs6000_framedata
{
+ CORE_ADDR func_start; /* True function start. */
int offset; /* total size of frame --- the distance
by which we decrement sp to allocate
the frame */
@@ -1577,7 +1578,6 @@ static CORE_ADDR
skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc, CORE_ADDR lim_pc,
struct rs6000_framedata *fdata)
{
- CORE_ADDR orig_pc = pc;
CORE_ADDR last_prologue_pc = pc;
CORE_ADDR li_found_pc = 0;
gdb_byte buf[4];
@@ -1595,12 +1595,14 @@ skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc, CORE_ADDR lim_pc,
int minimal_toc_loaded = 0;
int prev_insn_was_prologue_insn = 1;
int num_skip_non_prologue_insns = 0;
+ int num_skip_ppc64_gnu_linux_syscall_insn = 0;
int r0_contains_arg = 0;
const struct bfd_arch_info *arch_info = gdbarch_bfd_arch_info (gdbarch);
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
memset (fdata, 0, sizeof (struct rs6000_framedata));
+ fdata->func_start = pc;
fdata->saved_gpr = -1;
fdata->saved_fpr = -1;
fdata->saved_vr = -1;
@@ -1634,6 +1636,55 @@ skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc, CORE_ADDR lim_pc,
break;
op = extract_unsigned_integer (buf, 4, byte_order);
+ /* A PPC64 GNU/Linux system call function is split into two
+ sub-functions: a non-threaded fast-path (__NAME_nocancel)
+ which does not use a frame; and a threaded slow-path
+ (Lpseudo_cancel) that does create a frame. Ref:
+ nptl/sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep-cancel.h
+
+ *INDENT-OFF*
+ NAME:
+ SINGLE_THREAD_P
+ bne- .Lpseudo_cancel
+ __NAME_nocancel:
+ li r0,162
+ sc
+ bnslr+
+ b 0x7fe014ef64 <.__syscall_error>
+ Lpseudo_cancel:
+ stdu r1,-128(r1)
+ ...
+ *INDENT-ON*
+
+ Unfortunatly, because the latter case uses a local label (not
+ in the symbol table) a PC in "Lpseudo_cancel" appears to be
+ in "__NAME_nocancel". The following code recognizes this,
+ adjusting FUNC_START to point to where "Lpseudo_cancel"
+ should be, and parsing the prologue sequence as if
+ "Lpseudo_cancel" was the entry point. */
+
+ if (((op & 0xffff0000) == 0x38000000 /* li r0,N */
+ && pc == fdata->func_start + 0
+ && num_skip_ppc64_gnu_linux_syscall_insn == 0)
+ || (op == 0x44000002 /* sc */
+ && pc == fdata->func_start + 4
+ && num_skip_ppc64_gnu_linux_syscall_insn == 1)
+ || (op == 0x4ca30020 /* bnslr+ */
+ && pc == fdata->func_start + 8
+ && num_skip_ppc64_gnu_linux_syscall_insn == 2))
+ {
+ num_skip_ppc64_gnu_linux_syscall_insn++;
+ continue;
+ }
+ else if ((op & 0xfc000003) == 0x48000000 /* b __syscall_error */
+ && pc == fdata->func_start + 12
+ && num_skip_ppc64_gnu_linux_syscall_insn == 3)
+ {
+ num_skip_ppc64_gnu_linux_syscall_insn = -1;
+ fdata->func_start = pc;
+ continue;
+ }
+
if ((op & 0xfc1fffff) == 0x7c0802a6)
{ /* mflr Rx */
/* Since shared library / PIC code, which needs to get its
@@ -1825,9 +1876,9 @@ skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc, CORE_ADDR lim_pc,
we have no line table information or the line info tells
us that the subroutine call is not part of the line
associated with the prologue. */
- if ((pc - orig_pc) > 8)
+ if ((pc - fdata->func_start) > 8)
{
- struct symtab_and_line prologue_sal = find_pc_line (orig_pc, 0);
+ struct symtab_and_line prologue_sal = find_pc_line (fdata->func_start, 0);
struct symtab_and_line this_sal = find_pc_line (pc, 0);
if ((prologue_sal.line == 0)
--
2.14.3
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