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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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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>
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@ -10,6 +10,7 @@
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#include <asm/asm-offsets.h>
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#include <asm/unistd.h>
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#include <asm/dwarf.h>
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#include <asm/ptrace.h>
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.text
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.align 4
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@ -18,8 +19,8 @@
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__kernel_clock_gettime:
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CFI_STARTPROC
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ahi %r15,-16
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CFI_DEF_CFA_OFFSET 176
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CFI_VAL_OFFSET 15, -160
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CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD+16
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CFI_VAL_OFFSET 15, -STACK_FRAME_OVERHEAD
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basr %r5,0
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0: al %r5,21f-0b(%r5) /* get &_vdso_data */
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chi %r2,__CLOCK_REALTIME_COARSE
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@ -72,13 +73,13 @@ __kernel_clock_gettime:
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st %r1,4(%r3) /* store tp->tv_nsec */
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lhi %r2,0
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ahi %r15,16
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CFI_DEF_CFA_OFFSET 160
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CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD
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CFI_RESTORE 15
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br %r14
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/* CLOCK_MONOTONIC_COARSE */
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CFI_DEF_CFA_OFFSET 176
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CFI_VAL_OFFSET 15, -160
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CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD+16
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CFI_VAL_OFFSET 15, -STACK_FRAME_OVERHEAD
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9: l %r4,__VDSO_UPD_COUNT+4(%r5) /* load update counter */
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tml %r4,0x0001 /* pending update ? loop */
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jnz 9b
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@ -158,17 +159,17 @@ __kernel_clock_gettime:
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st %r1,4(%r3) /* store tp->tv_nsec */
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lhi %r2,0
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ahi %r15,16
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CFI_DEF_CFA_OFFSET 160
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CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD
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CFI_RESTORE 15
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br %r14
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/* Fallback to system call */
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CFI_DEF_CFA_OFFSET 176
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CFI_VAL_OFFSET 15, -160
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CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD+16
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CFI_VAL_OFFSET 15, -STACK_FRAME_OVERHEAD
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19: lhi %r1,__NR_clock_gettime
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svc 0
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ahi %r15,16
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CFI_DEF_CFA_OFFSET 160
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CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD
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CFI_RESTORE 15
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br %r14
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CFI_ENDPROC
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@ -10,6 +10,7 @@
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#include <asm/asm-offsets.h>
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#include <asm/unistd.h>
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#include <asm/dwarf.h>
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#include <asm/ptrace.h>
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.text
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.align 4
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@ -19,7 +20,7 @@ __kernel_gettimeofday:
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CFI_STARTPROC
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ahi %r15,-16
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CFI_ADJUST_CFA_OFFSET 16
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CFI_VAL_OFFSET 15, -160
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CFI_VAL_OFFSET 15, -STACK_FRAME_OVERHEAD
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basr %r5,0
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0: al %r5,13f-0b(%r5) /* get &_vdso_data */
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1: ltr %r3,%r3 /* check if tz is NULL */
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@ -10,6 +10,7 @@
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#include <asm/asm-offsets.h>
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#include <asm/unistd.h>
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#include <asm/dwarf.h>
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#include <asm/ptrace.h>
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.text
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.align 4
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@ -18,8 +19,8 @@
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__kernel_clock_gettime:
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CFI_STARTPROC
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aghi %r15,-16
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CFI_DEF_CFA_OFFSET 176
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CFI_VAL_OFFSET 15, -160
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CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD+16
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CFI_VAL_OFFSET 15, -STACK_FRAME_OVERHEAD
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larl %r5,_vdso_data
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cghi %r2,__CLOCK_REALTIME_COARSE
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je 4f
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@ -56,13 +57,13 @@ __kernel_clock_gettime:
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stg %r1,8(%r3) /* store tp->tv_nsec */
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lghi %r2,0
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aghi %r15,16
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CFI_DEF_CFA_OFFSET 160
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CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD
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CFI_RESTORE 15
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br %r14
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/* CLOCK_MONOTONIC_COARSE */
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CFI_DEF_CFA_OFFSET 176
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CFI_VAL_OFFSET 15, -160
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CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD+16
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CFI_VAL_OFFSET 15, -STACK_FRAME_OVERHEAD
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3: lg %r4,__VDSO_UPD_COUNT(%r5) /* load update counter */
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tmll %r4,0x0001 /* pending update ? loop */
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jnz 3b
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@ -115,13 +116,13 @@ __kernel_clock_gettime:
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stg %r1,8(%r3) /* store tp->tv_nsec */
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lghi %r2,0
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aghi %r15,16
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CFI_DEF_CFA_OFFSET 160
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CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD
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CFI_RESTORE 15
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br %r14
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/* CPUCLOCK_VIRT for this thread */
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CFI_DEF_CFA_OFFSET 176
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CFI_VAL_OFFSET 15, -160
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CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD+16
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CFI_VAL_OFFSET 15, -STACK_FRAME_OVERHEAD
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9: lghi %r4,0
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icm %r0,15,__VDSO_ECTG_OK(%r5)
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jz 12f
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@ -142,17 +143,17 @@ __kernel_clock_gettime:
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stg %r4,8(%r3)
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lghi %r2,0
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aghi %r15,16
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CFI_DEF_CFA_OFFSET 160
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CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD
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CFI_RESTORE 15
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br %r14
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/* Fallback to system call */
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CFI_DEF_CFA_OFFSET 176
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CFI_VAL_OFFSET 15, -160
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CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD+16
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CFI_VAL_OFFSET 15, -STACK_FRAME_OVERHEAD
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12: lghi %r1,__NR_clock_gettime
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svc 0
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aghi %r15,16
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CFI_DEF_CFA_OFFSET 160
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CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD
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CFI_RESTORE 15
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br %r14
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CFI_ENDPROC
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@ -10,6 +10,7 @@
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#include <asm/asm-offsets.h>
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#include <asm/unistd.h>
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#include <asm/dwarf.h>
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#include <asm/ptrace.h>
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.text
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.align 4
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@ -19,7 +20,7 @@ __kernel_gettimeofday:
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CFI_STARTPROC
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aghi %r15,-16
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CFI_ADJUST_CFA_OFFSET 16
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CFI_VAL_OFFSET 15, -160
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CFI_VAL_OFFSET 15, -STACK_FRAME_OVERHEAD
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larl %r5,_vdso_data
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0: ltgr %r3,%r3 /* check if tz is NULL */
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je 1f
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