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[12/12] S390: Fix unwind in 32-bit _mcount

Message ID 20180802075735.3457-13-iii@linux.ibm.com
State New
Headers show
Series S390: Implement __fentry__ | expand

Commit Message

Ilya Leoshkevich Aug. 2, 2018, 7:57 a.m. UTC 
* Fix CFI offset for %r14.
* Fix unwound value of %r15 being off by 128 bytes.

         * sysdeps/s390/s390-32/s390-mcount.S (_mcount):
         Fix unwind.
---
 sysdeps/s390/s390-32/s390-mcount.S | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)
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Patch

diff --git a/sysdeps/s390/s390-32/s390-mcount.S b/sysdeps/s390/s390-32/s390-mcount.S
index 153777e1b8..84f48a20fc 100644
--- a/sysdeps/s390/s390-32/s390-mcount.S
+++ b/sysdeps/s390/s390-32/s390-mcount.S
@@ -55,9 +55,13 @@  C_LABEL(_mcount)
 	/* Save the caller-clobbered registers.  */
 	ahi   %r15,-128
 	cfi_adjust_cfa_offset (128)
+	/* binutils 2.28+: .cfi_val_offset r15, -96 */
+	.cfi_escape \
+		/* DW_CFA_val_offset */ 0x14, \
+		/* r15 */               0x0f, \
+		/* scaled offset */     0x18
 	stm   %r14,%r5,96(%r15)
-	cfi_offset (r14, 0)
-	cfi_offset (r15, 4)
+	cfi_offset (r14, -128)
 	l     %r2,132(%r15)       # callers address  = first parameter
 	la    %r2,0(%r2)          # clear bit 0
 	la    %r3,0(%r14)         # callees address  = second parameter