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[binutils-gdb] Detect SW breakpoints in Cell/B.E. combined debugging
- From: Ulrich Weigand <uweigand at sourceware dot org>
- To: gdb-cvs at sourceware dot org
- Date: 27 Aug 2015 17:36:31 -0000
- Subject: [binutils-gdb] Detect SW breakpoints in Cell/B.E. combined debugging
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=1db33b5a028820d1eb656bffff727090a5504253
commit 1db33b5a028820d1eb656bffff727090a5504253
Author: Ulrich Weigand <ulrich.weigand@de.ibm.com>
Date: Thu Aug 27 19:20:29 2015 +0200
Detect SW breakpoints in Cell/B.E. combined debugging
The Linux target and gdbserver now check the siginfo si_code
reported on a SIGTRAP to detect whether the trap indicates
a software breakpoint was hit.
Unfortunately, on Cell/B.E., the kernel uses an si_code value
of TRAP_BRKPT when a SW breakpoint was hit in PowerPC code,
but a si_code value of SI_KERNEL when a SW breakpoint was
hit in SPU code.
This patch updates Linux target and gdbserver to accept both
si_code values to indicate SW breakpoint on PowerPC.
ChangeLog:
* nat/linux-ptrace.h (GDB_ARCH_TRAP_BRKPT): Replace by ...
(GDB_ARCH_IS_TRAP_BRKPT): ... this. Add __powerpc__ case.
* linux-nat.c (check_stopped_by_breakpoint): Use
GDB_ARCH_IS_TRAP_BRKPT instead of GDB_ARCH_TRAP_BRKPT.
gdbserver/ChangeLog:
* linux-low.c (check_stopped_by_breakpoint): Use
GDB_ARCH_IS_TRAP_BRKPT instead of GDB_ARCH_TRAP_BRKPT.
Diff:
---
gdb/ChangeLog | 7 +++++++
gdb/gdbserver/ChangeLog | 5 +++++
gdb/gdbserver/linux-low.c | 2 +-
gdb/linux-nat.c | 2 +-
gdb/nat/linux-ptrace.h | 15 +++++++++++----
5 files changed, 25 insertions(+), 6 deletions(-)
diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 8319083..61e9851 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,12 @@
2015-08-08 Ulrich Weigand <uweigand@de.ibm.com>
+ * nat/linux-ptrace.h (GDB_ARCH_TRAP_BRKPT): Replace by ...
+ (GDB_ARCH_IS_TRAP_BRKPT): ... this. Add __powerpc__ case.
+ * linux-nat.c (check_stopped_by_breakpoint): Use
+ GDB_ARCH_IS_TRAP_BRKPT instead of GDB_ARCH_TRAP_BRKPT.
+
+2015-08-08 Ulrich Weigand <uweigand@de.ibm.com>
+
* linux-thread-db.c (thread_db_get_thread_local_address): If the
thread was not yet discovered, use thread_from_lwp instead of
calling thread_db_find_new_threads_1.
diff --git a/gdb/gdbserver/ChangeLog b/gdb/gdbserver/ChangeLog
index 0be3030..cc733d8 100644
--- a/gdb/gdbserver/ChangeLog
+++ b/gdb/gdbserver/ChangeLog
@@ -1,3 +1,8 @@
+2015-08-27 Ulrich Weigand <Ulrich.Weigand@de.ibm.com>
+
+ * linux-low.c (check_stopped_by_breakpoint): Use
+ GDB_ARCH_IS_TRAP_BRKPT instead of GDB_ARCH_TRAP_BRKPT.
+
2015-08-27 Pedro Alves <palves@redhat.com>
* proc-service.c (ps_pdwrite): Return PS_ERR/PS_OK explicily.
diff --git a/gdb/gdbserver/linux-low.c b/gdb/gdbserver/linux-low.c
index a8fa91c..f4c6029 100644
--- a/gdb/gdbserver/linux-low.c
+++ b/gdb/gdbserver/linux-low.c
@@ -651,7 +651,7 @@ check_stopped_by_breakpoint (struct lwp_info *lwp)
{
if (siginfo.si_signo == SIGTRAP)
{
- if (siginfo.si_code == GDB_ARCH_TRAP_BRKPT)
+ if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code))
{
if (debug_threads)
{
diff --git a/gdb/linux-nat.c b/gdb/linux-nat.c
index 4da361d..51541d5 100644
--- a/gdb/linux-nat.c
+++ b/gdb/linux-nat.c
@@ -2801,7 +2801,7 @@ check_stopped_by_breakpoint (struct lwp_info *lp)
{
if (siginfo.si_signo == SIGTRAP)
{
- if (siginfo.si_code == GDB_ARCH_TRAP_BRKPT)
+ if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code))
{
if (debug_linux_nat)
fprintf_unfiltered (gdb_stdlog,
diff --git a/gdb/nat/linux-ptrace.h b/gdb/nat/linux-ptrace.h
index 41f668c..8bff908 100644
--- a/gdb/nat/linux-ptrace.h
+++ b/gdb/nat/linux-ptrace.h
@@ -135,12 +135,19 @@ struct buffer;
running to a breakpoint and checking what comes out of
siginfo->si_code.
- The generic Linux target code should use GDB_ARCH_TRAP_BRKPT
- instead of TRAP_BRKPT to abstract out this x86 peculiarity. */
+ The ppc kernel does use TRAP_BRKPT for software breakpoints
+ in PowerPC code, but it uses SI_KERNEL for software breakpoints
+ in SPU code on a Cell/B.E. However, SI_KERNEL is never seen
+ on a SIGTRAP for any other reason.
+
+ The generic Linux target code should use GDB_ARCH_IS_TRAP_BRKPT
+ instead of TRAP_BRKPT to abstract out these peculiarities. */
#if defined __i386__ || defined __x86_64__
-# define GDB_ARCH_TRAP_BRKPT SI_KERNEL
+# define GDB_ARCH_IS_TRAP_BRKPT(X) ((X) == SI_KERNEL)
+#elif defined __powerpc__
+# define GDB_ARCH_IS_TRAP_BRKPT(X) ((X) == SI_KERNEL || (X) == TRAP_BRKPT)
#else
-# define GDB_ARCH_TRAP_BRKPT TRAP_BRKPT
+# define GDB_ARCH_IS_TRAP_BRKPT(X) ((X) == TRAP_BRKPT)
#endif
#ifndef TRAP_HWBKPT