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s390/vdso: correct CFI annotations of vDSO functions 

Correct stack frame overhead for 31-bit vdso, which should be 96 rather
then 160. This is done by reusing STACK_FRAME_OVERHEAD definition which
contains correct value based on build flags. This fixes stack unwinding
within vdso code for 31-bit processes. While at it replace all hard coded
stack frame overhead values with the same definition in vdso64 as well.

Reviewed-by: Hendrik Brueckner <brueckner@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Vasily Gorbik 2018-09-14 18:08:10 +02:00 committed by Martin Schwidefsky
parent d1befa6582
commit 26f4414a45
4 changed files with 27 additions and 23 deletions
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19
arch/s390/kernel/vdso32/clock_gettime.S
View File

@ -10,6 +10,7 @@
#include <asm/asm-offsets.h>
#include <asm/unistd.h>
#include <asm/dwarf.h>
#include <asm/ptrace.h>
.text
.align 4
@ -18,8 +19,8 @@
__kernel_clock_gettime:
CFI_STARTPROC
ahi %r15,-16
CFI_DEF_CFA_OFFSET 176
CFI_VAL_OFFSET 15, -160
CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD+16
CFI_VAL_OFFSET 15, -STACK_FRAME_OVERHEAD
basr %r5,0
0: al %r5,21f-0b(%r5) /* get &_vdso_data */
chi %r2,__CLOCK_REALTIME_COARSE
@ -72,13 +73,13 @@ __kernel_clock_gettime:
st %r1,4(%r3) /* store tp->tv_nsec */
lhi %r2,0
ahi %r15,16
CFI_DEF_CFA_OFFSET 160
CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD
CFI_RESTORE 15
br %r14
/* CLOCK_MONOTONIC_COARSE */
CFI_DEF_CFA_OFFSET 176
CFI_VAL_OFFSET 15, -160
CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD+16
CFI_VAL_OFFSET 15, -STACK_FRAME_OVERHEAD
9: l %r4,__VDSO_UPD_COUNT+4(%r5) /* load update counter */
tml %r4,0x0001 /* pending update ? loop */
jnz 9b
@ -158,17 +159,17 @@ __kernel_clock_gettime:
st %r1,4(%r3) /* store tp->tv_nsec */
lhi %r2,0
ahi %r15,16
CFI_DEF_CFA_OFFSET 160
CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD
CFI_RESTORE 15
br %r14
/* Fallback to system call */
CFI_DEF_CFA_OFFSET 176
CFI_VAL_OFFSET 15, -160
CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD+16
CFI_VAL_OFFSET 15, -STACK_FRAME_OVERHEAD
19: lhi %r1,__NR_clock_gettime
svc 0
ahi %r15,16
CFI_DEF_CFA_OFFSET 160
CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD
CFI_RESTORE 15
br %r14
CFI_ENDPROC

3
arch/s390/kernel/vdso32/gettimeofday.S
View File

@ -10,6 +10,7 @@
#include <asm/asm-offsets.h>
#include <asm/unistd.h>
#include <asm/dwarf.h>
#include <asm/ptrace.h>
.text
.align 4
@ -19,7 +20,7 @@ __kernel_gettimeofday:
CFI_STARTPROC
ahi %r15,-16
CFI_ADJUST_CFA_OFFSET 16
CFI_VAL_OFFSET 15, -160
CFI_VAL_OFFSET 15, -STACK_FRAME_OVERHEAD
basr %r5,0
0: al %r5,13f-0b(%r5) /* get &_vdso_data */
1: ltr %r3,%r3 /* check if tz is NULL */

25
arch/s390/kernel/vdso64/clock_gettime.S
View File

@ -10,6 +10,7 @@
#include <asm/asm-offsets.h>
#include <asm/unistd.h>
#include <asm/dwarf.h>
#include <asm/ptrace.h>
.text
.align 4
@ -18,8 +19,8 @@
__kernel_clock_gettime:
CFI_STARTPROC
aghi %r15,-16
CFI_DEF_CFA_OFFSET 176
CFI_VAL_OFFSET 15, -160
CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD+16
CFI_VAL_OFFSET 15, -STACK_FRAME_OVERHEAD
larl %r5,_vdso_data
cghi %r2,__CLOCK_REALTIME_COARSE
je 4f
@ -56,13 +57,13 @@ __kernel_clock_gettime:
stg %r1,8(%r3) /* store tp->tv_nsec */
lghi %r2,0
aghi %r15,16
CFI_DEF_CFA_OFFSET 160
CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD
CFI_RESTORE 15
br %r14
/* CLOCK_MONOTONIC_COARSE */
CFI_DEF_CFA_OFFSET 176
CFI_VAL_OFFSET 15, -160
CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD+16
CFI_VAL_OFFSET 15, -STACK_FRAME_OVERHEAD
3: lg %r4,__VDSO_UPD_COUNT(%r5) /* load update counter */
tmll %r4,0x0001 /* pending update ? loop */
jnz 3b
@ -115,13 +116,13 @@ __kernel_clock_gettime:
stg %r1,8(%r3) /* store tp->tv_nsec */
lghi %r2,0
aghi %r15,16
CFI_DEF_CFA_OFFSET 160
CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD
CFI_RESTORE 15
br %r14
/* CPUCLOCK_VIRT for this thread */
CFI_DEF_CFA_OFFSET 176
CFI_VAL_OFFSET 15, -160
CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD+16
CFI_VAL_OFFSET 15, -STACK_FRAME_OVERHEAD
9: lghi %r4,0
icm %r0,15,__VDSO_ECTG_OK(%r5)
jz 12f
@ -142,17 +143,17 @@ __kernel_clock_gettime:
stg %r4,8(%r3)
lghi %r2,0
aghi %r15,16
CFI_DEF_CFA_OFFSET 160
CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD
CFI_RESTORE 15
br %r14
/* Fallback to system call */
CFI_DEF_CFA_OFFSET 176
CFI_VAL_OFFSET 15, -160
CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD+16
CFI_VAL_OFFSET 15, -STACK_FRAME_OVERHEAD
12: lghi %r1,__NR_clock_gettime
svc 0
aghi %r15,16
CFI_DEF_CFA_OFFSET 160
CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD
CFI_RESTORE 15
br %r14
CFI_ENDPROC

3
arch/s390/kernel/vdso64/gettimeofday.S
View File

@ -10,6 +10,7 @@
#include <asm/asm-offsets.h>
#include <asm/unistd.h>
#include <asm/dwarf.h>
#include <asm/ptrace.h>
.text
.align 4
@ -19,7 +20,7 @@ __kernel_gettimeofday:
CFI_STARTPROC
aghi %r15,-16
CFI_ADJUST_CFA_OFFSET 16
CFI_VAL_OFFSET 15, -160
CFI_VAL_OFFSET 15, -STACK_FRAME_OVERHEAD
larl %r5,_vdso_data
0: ltgr %r3,%r3 /* check if tz is NULL */
je 1f