[2.28 COMMITTED] powerpc: Add missing CFI register information (bug #23614)

[2.28 COMMITTED] powerpc: Add missing CFI register information (bug #23614)

[Florian Weimer]

From: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>

Add CFI information about the offset of registers stored in the stack
frame.

	[BZ #23614]
	* sysdeps/powerpc/powerpc64/addmul_1.S (FUNC): Add CFI offset for
	registers saved in the stack frame.
	* sysdeps/powerpc/powerpc64/lshift.S (__mpn_lshift): Likewise.
	* sysdeps/powerpc/powerpc64/mul_1.S (__mpn_mul_1): Likewise.

Signed-off-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
Reviewed-by: Gabriel F. T. Gomes <gabriel@inconstante.eti.br>
(cherry picked from commit 1d880d4a9bf7608c2cd33bbe954ce6995f79121a)

2018-12-12  Tulio Magno Quites Machado Filho  <tuliom@linux.ibm.com>

	[BZ #23614]
	* sysdeps/powerpc/powerpc64/addmul_1.S (FUNC): Add CFI offset for
	registers saved in the stack frame.
	* sysdeps/powerpc/powerpc64/lshift.S (__mpn_lshift): Likewise.
	* sysdeps/powerpc/powerpc64/mul_1.S (__mpn_mul_1): Likewise.

diff --git a/NEWS b/NEWS
index 4d4a5a1911..05f7342fcb 100644
--- a/NEWS
+++ b/NEWS
@@ -20,6 +20,7 @@ The following bugs are resolved with this release:
   [23578] regex: Fix memory overread in re_compile_pattern
   [23579] libc: Errors misreported in preadv2
   [23606] Missing ENDBR32 in sysdeps/i386/start.S
+  [23614] powerpc: missing CFI register information in __mpn_* functions
   [23679] gethostid: Missing NULL check for gethostbyname_r result
   [23709] Fix CPU string flags for Haswell-type CPUs
   [23717] Fix stack overflow in stdlib/tst-setcontext9
diff --git a/sysdeps/powerpc/powerpc64/addmul_1.S b/sysdeps/powerpc/powerpc64/addmul_1.S
index 48e3b1b290..e450d6a52c 100644
--- a/sysdeps/powerpc/powerpc64/addmul_1.S
+++ b/sysdeps/powerpc/powerpc64/addmul_1.S
@@ -34,16 +34,27 @@
 #define N   r5
 #define VL  r6
 
+#define R27SAVE  (-40)
+#define R28SAVE  (-32)
+#define R29SAVE  (-24)
+#define R30SAVE  (-16)
+#define R31SAVE  (-8)
+
 ENTRY_TOCLESS (FUNC, 5)
-	std	r31, -8(r1)
+	std	r31, R31SAVE(r1)
 	rldicl.	r0, N, 0, 62
-	std	r30, -16(r1)
+	std	r30, R30SAVE(r1)
 	cmpdi	VL, r0, 2
-	std	r29, -24(r1)
+	std	r29, R29SAVE(r1)
 	addi	N, N, 3
-	std	r28, -32(r1)
+	std	r28, R28SAVE(r1)
 	srdi	N, N, 2
-	std	r27, -40(r1)
+	std	r27, R27SAVE(r1)
+	cfi_offset(r31, R31SAVE)
+	cfi_offset(r30, R30SAVE)
+	cfi_offset(r29, R29SAVE)
+	cfi_offset(r28, R28SAVE)
+	cfi_offset(r27, R27SAVE)
 	mtctr	N
 	beq	cr0, L(b00)
 	blt	cr6, L(b01)
@@ -199,10 +210,10 @@ L(end):	mulld	r0, r9, VL
 	addic	r11, r11, 1
 #endif
 	addze	RP, r8
-	ld	r31, -8(r1)
-	ld	r30, -16(r1)
-	ld	r29, -24(r1)
-	ld	r28, -32(r1)
-	ld	r27, -40(r1)
+	ld	r31, R31SAVE(r1)
+	ld	r30, R30SAVE(r1)
+	ld	r29, R29SAVE(r1)
+	ld	r28, R28SAVE(r1)
+	ld	r27, R27SAVE(r1)
 	blr
 END(FUNC)
diff --git a/sysdeps/powerpc/powerpc64/lshift.S b/sysdeps/powerpc/powerpc64/lshift.S
index 8b6396ee6c..855d6f2993 100644
--- a/sysdeps/powerpc/powerpc64/lshift.S
+++ b/sysdeps/powerpc/powerpc64/lshift.S
@@ -26,11 +26,15 @@
 #define TNC      r0
 #define U0      r30
 #define U1      r31
+#define U0SAVE  (-16)
+#define U1SAVE  (-8)
 #define RETVAL   r5
 
 ENTRY_TOCLESS (__mpn_lshift, 5)
-	std	U1, -8(r1)
-	std	U0, -16(r1)
+	std	U1, U1SAVE(r1)
+	std	U0, U0SAVE(r1)
+	cfi_offset(U1, U1SAVE)
+	cfi_offset(U0, U0SAVE)
 	subfic	TNC, CNT, 64
 	sldi	r7, N, RP
 	add	UP, UP, r7
@@ -170,8 +174,8 @@ L(cj3):	or	r10, r12, r7
 L(cj2):	std	r10, -32(RP)
 	std	r8, -40(RP)
 
-L(ret):	ld	U1, -8(r1)
-	ld	U0, -16(r1)
+L(ret):	ld	U1, U1SAVE(r1)
+	ld	U0, U0SAVE(r1)
 	mr	RP, RETVAL
 	blr
 END(__mpn_lshift)
diff --git a/sysdeps/powerpc/powerpc64/mul_1.S b/sysdeps/powerpc/powerpc64/mul_1.S
index 953ded8028..cade365258 100644
--- a/sysdeps/powerpc/powerpc64/mul_1.S
+++ b/sysdeps/powerpc/powerpc64/mul_1.S
@@ -24,9 +24,14 @@
 #define N   r5
 #define VL  r6
 
+#define R26SAVE  (-48)
+#define R27SAVE  (-40)
+
 ENTRY_TOCLESS (__mpn_mul_1, 5)
-	std	r27, -40(r1)
-	std	r26, -48(r1)
+	std	r27, R27SAVE(r1)
+	std	r26, R26SAVE(r1)
+	cfi_offset(r27, R27SAVE)
+	cfi_offset(r26, R26SAVE)
 	li	r12, 0
 	ld	r26, 0(UP)
 
@@ -129,7 +134,7 @@ L(end):	mulld	r0, r26, VL
 	std	r0, 0(RP)
 	std	r7, 8(RP)
 L(ret):	addze	RP, r8
-	ld	r27, -40(r1)
-	ld	r26, -48(r1)
+	ld	r27, R27SAVE(r1)
+	ld	r26, R26SAVE(r1)
 	blr
 END(__mpn_mul_1)