Allow backtracing through ____longjmp_chk.

git-mirror · Jun 26, 2009 · bb87239 · bb87239
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commit bb87239
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diff --git a/ChangeLog b/ChangeLog
@@ -1,3 +1,10 @@
+2009-06-26  Andreas Schwab  <aschwab@redhat.com>
+
+	* sysdeps/powerpc/powerpc32/____longjmp_chk.S (CHECK_SP): Save lr
+	before call.
+	* sysdeps/powerpc/powerpc64/____longjmp_chk.S (CHECK_SP):
+	Likewise.
+
 2009-06-26  Ulrich Drepper  <drepper@redhat.com>
 
 	* resolv/resolv.h: Define RES_SNGLKUPREOP.

diff --git a/sysdeps/powerpc/powerpc32/____longjmp_chk.S b/sysdeps/powerpc/powerpc32/____longjmp_chk.S
@@ -49,8 +49,16 @@
 #define CHECK_SP(reg) \
 	cmplw	reg, r1;				\
 	bge+	.Lok;					\
+	cfi_remember_state;				\
+	mflr	r0;					\
+	stwu	r1,-16(r1);				\
+	cfi_adjust_cfa_offset (16);			\
+	stw	r0,20(r1);				\
+	cfi_offset (lr, 4);				\
 	LOAD_ARG;					\
 	bl	HIDDEN_JUMPTARGET (__fortify_fail);	\
+	nop;						\
+	cfi_restore_state;				\
 .Lok:
 
 #include <__longjmp-common.S>
diff --git a/sysdeps/powerpc/powerpc64/____longjmp_chk.S b/sysdeps/powerpc/powerpc64/____longjmp_chk.S
@@ -32,8 +32,16 @@
 #define CHECK_SP(reg) \
 	cmpld	reg, r1;				\
 	bge+	.Lok;					\
+	cfi_remember_state;				\
+	mflr	r0;					\
+	std	r0,16(r1);				\
+	stdu	r1,-112(r1);				\
+	cfi_adjust_cfa_offset (112);			\
+	cfi_offset (lr, 16);				\
 	ld	r3,.LC1@toc(2);				\
 	bl	HIDDEN_JUMPTARGET (__fortify_fail);	\
+	nop;						\
+	cfi_restore_state;				\
 .Lok:
 
 #include <__longjmp-common.S>