[PATCH 1/4] Fix ppc64 single step over atomic sequence testcase

[Anton Blanchard <anton@samba.org>]

The current ppc64 single step over atomic sequence testcase is written
in C and breaks with some versions of gcc. Convert the test to
assembly and use stepi to step through it.

gdb/
2014-03-28  Anton Blanchard  <anton@samba.org>

	* gdb.arch/ppc64-atomic-inst.c: Remove.
	* gdb.arch/ppc64-atomic-inst.s: New file.
	* gdb.arch/ppc64-atomic-inst.exp: Adapt for asm based testcase.
---
 gdb/testsuite/gdb.arch/ppc64-atomic-inst.c   | 44 --------------------
 gdb/testsuite/gdb.arch/ppc64-atomic-inst.exp | 15 +++++--
 gdb/testsuite/gdb.arch/ppc64-atomic-inst.s   | 61 ++++++++++++++++++++++++++++
 3 files changed, 72 insertions(+), 48 deletions(-)
 delete mode 100644 gdb/testsuite/gdb.arch/ppc64-atomic-inst.c
 create mode 100644 gdb/testsuite/gdb.arch/ppc64-atomic-inst.s

diff --git a/gdb/testsuite/gdb.arch/ppc64-atomic-inst.c b/gdb/testsuite/gdb.arch/ppc64-atomic-inst.c
deleted file mode 100644
index 303e383..0000000
--- a/gdb/testsuite/gdb.arch/ppc64-atomic-inst.c
+++ /dev/null
@@ -1,44 +0,0 @@
-/* This file is part of GDB, the GNU debugger.
-
-   Copyright 2008-2014 Free Software Foundation, Inc.
-
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
-
-#include <stdio.h>
-
-int main()
-{
-  unsigned int word = 0;
-  unsigned int *word_addr = &word;
-  unsigned long dword = 0;
-  unsigned long *dword_addr = &dword;
-
-  __asm __volatile ("1:     lwarx   %0,0,%2\n"              \
-                    "       addi    %0,%0,1\n"              \
-                    "       stwcx.  %0,0,%2\n"              \
-                    "       bne-    1b"			    \
-                    : "=&b" (word), "=m" (*word_addr)       \
-                    : "b" (word_addr), "m" (*word_addr)     \
-                    : "cr0", "memory");			    \
-
-  __asm __volatile ("1:     ldarx   %0,0,%2\n"              \
-                    "       addi    %0,%0,1\n"              \
-                    "       stdcx.  %0,0,%2\n"              \
-                    "       bne-    1b"                     \
-                    : "=&b" (dword), "=m" (*dword_addr)     \
-                    : "b" (dword_addr), "m" (*dword_addr)   \
-                    : "cr0", "memory");                     \
-
-  return 0;
-}
diff --git a/gdb/testsuite/gdb.arch/ppc64-atomic-inst.exp b/gdb/testsuite/gdb.arch/ppc64-atomic-inst.exp
index f5f3b40..efcd82a 100644
--- a/gdb/testsuite/gdb.arch/ppc64-atomic-inst.exp
+++ b/gdb/testsuite/gdb.arch/ppc64-atomic-inst.exp
@@ -27,7 +27,7 @@ if {![istarget "powerpc*"] || ![is_lp64_target]} {
 }
 
 set testfile "ppc64-atomic-inst"
-set srcfile ${testfile}.c
+set srcfile ${testfile}.s
 set binfile ${objdir}/${subdir}/${testfile}
 set compile_flags {debug quiet}
 
@@ -50,11 +50,18 @@ set bp1 [gdb_get_line_number "lwarx"]
 gdb_breakpoint "$bp1" "Breakpoint $decimal at $hex" \
   "Set the breakpoint at the start of the sequence"
 
+set bp2 [gdb_get_line_number "ldarx"]
+gdb_breakpoint "$bp2" "Breakpoint $decimal at $hex" \
+  "Set the breakpoint at the start of the sequence"
+
 gdb_test continue "Continuing.*Breakpoint $decimal.*" \
   "Continue until breakpoint"
 
-gdb_test next ".*__asm __volatile.*" \
+gdb_test nexti "bne.*1b" \
   "Step through the lwarx/stwcx sequence"
 
-gdb_test next ".*return 0.*" \
-  "Step through the ldarx/stdcx sequence"
+gdb_test continue "Continuing.*Breakpoint $decimal.*" \
+  "Continue until breakpoint"
+
+gdb_test nexti "bne.*1b" \
+  "Step through the lwarx/stwcx sequence"
diff --git a/gdb/testsuite/gdb.arch/ppc64-atomic-inst.s b/gdb/testsuite/gdb.arch/ppc64-atomic-inst.s
new file mode 100644
index 0000000..15ccfd9
--- /dev/null
+++ b/gdb/testsuite/gdb.arch/ppc64-atomic-inst.s
@@ -0,0 +1,61 @@
+/* This file is part of GDB, the GNU debugger.
+
+   Copyright 2008-2014 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+	.align 2
+	.globl main
+#if _CALL_ELF == 2
+	.type main,@function
+main:
+#else
+	.section ".opd","aw"
+	.align 3
+main:
+	.quad .main,.TOC.@tocbase,0
+	.size main,.-main
+	.previous
+	.globl .main
+	.type .main,@function
+.main:
+#endif
+
+	li	0,0
+	addi	4,1,-8
+
+	stw	0,0(4)
+1:	lwarx	5,0,4
+	cmpwi	5,0
+	bne	2f
+	addi	5,5,1
+	stwcx.	5,0,4
+	bne	1b
+
+	std	0,0(4)
+2:	ldarx	5,0,4
+	cmpdi	5,0
+	bne	3f
+	addi	5,5,1
+	stdcx.	5,0,4
+	bne	1b
+
+3:	li	3,0
+	blr
+
+#if _CALL_ELF == 2
+	.size main,.-main
+#else
+	.size .main,.-.main
+#endif
-- 
1.8.3.2