* sysdeps/generic/sysdep.h (cfi_offset, cfi_startproc,

cfi_endproc, cfi_def_cfa, cfi_def_ccfa_register, 
cfi_def_cfa_offset, cfi_adjust_cfa_offset, cfi_offset): Define.
	* sysdeps/x86_64/sysdep.h (CALL_MCOUNT): Add cfi directives.
	(ENTRY): Likewise.
	(END): Likewise.

	* configure.in: Test for asm cfi directives.

	* config.h.in: Add HAVE_ASM_CFI_DIRECTIVES.
2003-05-21  Andreas Jaeger  <aj@suse.de>

	* sysdeps/generic/sysdep.h (cfi_offset, cfi_startproc,
	cfi_endproc, cfi_def_cfa, cfi_def_ccfa_register,
	cfi_def_cfa_offset, cfi_adjust_cfa_offset, cfi_offset): Define.

	* sysdeps/x86_64/sysdep.h (CALL_MCOUNT): Add cfi directives.
	(ENTRY): Likewise.
	(END): Likewise.

	* configure.in: Test for asm cfi directives.

	* config.h.in: Add HAVE_ASM_CFI_DIRECTIVES.

6 files changed, 100 insertions, 3 deletions

diff --git a/ChangeLog b/ChangeLog
index 29791a6..f5e6076 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,17 @@
+2003-05-21  Andreas Jaeger  <aj@suse.de>
+
+	* sysdeps/generic/sysdep.h (cfi_offset, cfi_startproc,
+	cfi_endproc, cfi_def_cfa, cfi_def_ccfa_register,
+	cfi_def_cfa_offset, cfi_adjust_cfa_offset, cfi_offset): Define.
+
+	* sysdeps/x86_64/sysdep.h (CALL_MCOUNT): Add cfi directives.
+	(ENTRY): Likewise.
+	(END): Likewise.
+
+	* configure.in: Test for asm cfi directives.
+
+	* config.h.in: Add HAVE_ASM_CFI_DIRECTIVES.
+
 2003-05-17  Andreas Jaeger  <aj@suse.de>
 
 	* sysdeps/unix/sysv/linux/x86_64/syscall.S: Revert last patch.
diff --git a/config.h.in b/config.h.in
index cd132ce..ba5a55c 100644
--- a/config.h.in
+++ b/config.h.in
@@ -31,6 +31,9 @@
 /* Define if weak symbols are available via the `.weakext' directive.  */
 #undef	HAVE_ASM_WEAKEXT_DIRECTIVE
 
+/* Define if CFI directives are available.  */
+#undef	HAVE_ASM_CFI_DIRECTIVES
+
 /* Define to the assembler line separator character for multiple
    assembler instructions per line.  Default is `;'  */
 #undef ASM_LINE_SEP
diff --git a/configure b/configure
index eac55c6..1dfeaa2 100755
--- a/configure
+++ b/configure
@@ -5689,6 +5689,39 @@ _ACEOF
   ;;
 esac
 
+echo "$as_me:$LINENO: checking whether CFI directives are supported" >&5
+echo $ECHO_N "checking whether CFI directives are supported... $ECHO_C" >&6
+if test "${libc_cv_asm_cfi_directives+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  cat > conftest.s <<EOF
+        .text
+        .type   func,@function
+func:
+        .cfi_startproc
+        .cfi_endproc
+EOF
+if { ac_try='${CC-cc} $ASFLAGS -c conftest.s 1>&5'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  libc_cv_asm_cfi_directives=yes
+else
+  libc_cv_asm_cfi_directives=no
+fi
+rm -f conftest*
+fi
+echo "$as_me:$LINENO: result: $libc_cv_asm_cfi_directives" >&5
+echo "${ECHO_T}$libc_cv_asm_cfi_directives" >&6
+if test $libc_cv_asm_cfi_directives = yes; then
+  cat >>confdefs.h <<\_ACEOF
+#define HAVE_ASM_CFI_DIRECTIVES 1
+_ACEOF
+
+fi
+
 echo "$as_me:$LINENO: checking if -g produces usable source locations for assembler-with-cpp" >&5
 echo $ECHO_N "checking if -g produces usable source locations for assembler-with-cpp... $ECHO_C" >&6
 if test "${libc_cv_cpp_asm_debuginfo+set}" = set; then
diff --git a/configure.in b/configure.in
index f0511ac..c415f37 100644
--- a/configure.in
+++ b/configure.in
@@ -1502,6 +1502,24 @@ EOF
   ;;
 esac
 
+AC_CACHE_CHECK(whether CFI directives are supported, libc_cv_asm_cfi_directives, [dnl
+cat > conftest.s <<EOF
+        .text
+        .type   func,@function
+func:
+        .cfi_startproc
+        .cfi_endproc
+EOF
+if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
+  libc_cv_asm_cfi_directives=yes
+else
+  libc_cv_asm_cfi_directives=no
+fi
+rm -f conftest*])
+if test $libc_cv_asm_cfi_directives = yes; then
+  AC_DEFINE(HAVE_ASM_CFI_DIRECTIVES)
+fi  
+
 AC_CACHE_CHECK(if -g produces usable source locations for assembler-with-cpp,
 	       libc_cv_cpp_asm_debuginfo, [dnl
 cat > conftest.S <<EOF
diff --git a/sysdeps/generic/sysdep.h b/sysdeps/generic/sysdep.h
index 0d69ac6..3223c97 100644
--- a/sysdeps/generic/sysdep.h
+++ b/sysdeps/generic/sysdep.h
@@ -46,4 +46,25 @@
 #ifndef JUMPTARGET
 #define JUMPTARGET(sym)		sym
 #endif
+
+/* Makros to generate eh_frame unwind information.  */
+# ifdef HAVE_ASM_CFI_DIRECTIVES
+#  define cfi_startproc	.cfi_startproc
+#  define cfi_endproc	.cfi_endproc
+#  define cfi_def_cfa(reg, off)	.cfi_def_cfa reg, off
+#  define cfi_def_cfa_register(reg)	.cfi_def_cfa_register reg
+#  define cfi_def_cfa_offset(off)	.cfi_def_cfa_offset off
+#  define cfi_adjust_cfa_offset(off)	.cfi_adjust_cfa_offset off
+#  define cfi_offset(reg, off)	.cfi_offset reg, off
+# else
+#  define cfi_startproc
+#  define cfi_endproc
+#  define cfi_def_cfa(reg, off)
+#  define cfi_def_cfa_register(reg)
+#  define cfi_def_cfa_offset(off)
+#  define cfi_adjust_cfa_offset(off)
+#  define cfi_offset(reg, off)
+# endif
+
+
 #endif /* __ASSEMBLER__ */
diff --git a/sysdeps/x86_64/sysdep.h b/sysdeps/x86_64/sysdep.h
index 99b7e56..122270f 100644
--- a/sysdeps/x86_64/sysdep.h
+++ b/sysdeps/x86_64/sysdep.h
@@ -50,18 +50,26 @@
   ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function)			      \
   .align ALIGNARG(4);							      \
   C_LABEL(name)								      \
+  cfi_startproc;							      \
   CALL_MCOUNT
 
 #undef	END
 #define END(name)							      \
-  ASM_SIZE_DIRECTIVE(name)						      \
+  cfi_endproc;								      \
+  ASM_SIZE_DIRECTIVE(name)
 
 /* If compiled for profiling, call `mcount' at the start of each function.  */
 #ifdef	PROF
 /* The mcount code relies on a normal frame pointer being on the stack
    to locate our caller, so push one just for its benefit.  */
-#define CALL_MCOUNT \
-  pushq %rbp; movq %rsp, %rbp; call JUMPTARGET(mcount); popq %rbp;
+#define CALL_MCOUNT                                                          \
+  pushq %rbp;                                                                \
+  cfi_adjust_cfa_offset(8);                                                  \
+  movq %rsp, %rbp;                                                           \
+  cfi_def_cfa_register(%rbp);                                                \
+  call JUMPTARGET(mcount);                                                   \
+  popq %rbp;                                                                 \
+  cfi_def_cfa(rsp,8);
 #else
 #define CALL_MCOUNT		/* Do nothing.  */
 #endif