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[PATCH] powerpc: Make the vDSO functions set error code (#2)

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The vDSO functions should have the same calling convention as a syscall.
Unfortunately, they currently don't set the cr0.so bit which is used to
indicate an error. This patch makes them clear this bit unconditionally
since all functions currently succeed. The syscall fallback done by some
of them will eventually override this if the syscall fails.

This also changes the symbol version of all vdso exports to make sure
glibc can differenciate between old and fixed calls for existing ones
like __kernel_gettimeofday.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Benjamin Herrenschmidt 2005-11-16 13:54:32 +11:00 committed by Paul Mackerras
parent d3ed658320
commit 5d66da3d71
7 changed files with 17 additions and 3 deletions
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2
arch/powerpc/kernel/vdso32/cacheflush.S
View file

@ -35,6 +35,7 @@ V_FUNCTION_BEGIN(__kernel_sync_dicache)
subf r8,r6,r4 /* compute length */
add r8,r8,r5 /* ensure we get enough */
srwi. r8,r8,7 /* compute line count */
crclr cr0*4+so
beqlr /* nothing to do? */
mtctr r8
mr r3,r6
@ -58,6 +59,7 @@ V_FUNCTION_END(__kernel_sync_dicache)
*/
V_FUNCTION_BEGIN(__kernel_sync_dicache_p5)
.cfi_startproc
crclr cr0*4+so
sync
isync
li r3,0

3
arch/powerpc/kernel/vdso32/datapage.S
View file

@ -54,7 +54,6 @@ V_FUNCTION_BEGIN(__kernel_get_syscall_map)
.cfi_startproc
mflr r12
.cfi_register lr,r12
mr r4,r3
bl __get_datapage@local
mtlr r12
@ -63,6 +62,7 @@ V_FUNCTION_BEGIN(__kernel_get_syscall_map)
beqlr
li r0,__NR_syscalls
stw r0,0(r4)
crclr cr0*4+so
blr
.cfi_endproc
V_FUNCTION_END(__kernel_get_syscall_map)
@ -80,6 +80,7 @@ V_FUNCTION_BEGIN(__kernel_get_tbfreq)
lwz r4,(CFG_TB_TICKS_PER_SEC + 4)(r3)
lwz r3,CFG_TB_TICKS_PER_SEC(r3)
mtlr r12
crclr cr0*4+so
blr
.cfi_endproc
V_FUNCTION_END(__kernel_get_tbfreq)

4
arch/powerpc/kernel/vdso32/gettimeofday.S
View file

@ -59,6 +59,7 @@ V_FUNCTION_BEGIN(__kernel_gettimeofday)
stw r5,TZONE_TZ_DSTTIME(r11)
1: mtlr r12
crclr cr0*4+so
li r3,0
blr
@ -117,6 +118,7 @@ V_FUNCTION_BEGIN(__kernel_clock_gettime)
mulli r5,r5,1000
stw r5,TSPC32_TV_NSEC(r11)
mtlr r12
crclr cr0*4+so
li r3,0
blr
@ -185,6 +187,7 @@ V_FUNCTION_BEGIN(__kernel_clock_gettime)
stw r4,TSPC32_TV_NSEC(r11)
mtlr r12
crclr cr0*4+so
li r3,0
blr
@ -219,6 +222,7 @@ V_FUNCTION_BEGIN(__kernel_clock_getres)
li r3,0
cmpli cr0,r4,0
crclr cr0*4+so
beqlr
lis r5,CLOCK_REALTIME_RES@h
ori r5,r5,CLOCK_REALTIME_RES@l

2
arch/powerpc/kernel/vdso64/cacheflush.S
View file

@ -35,6 +35,7 @@ V_FUNCTION_BEGIN(__kernel_sync_dicache)
subf r8,r6,r4 /* compute length */
add r8,r8,r5 /* ensure we get enough */
srwi. r8,r8,7 /* compute line count */
crclr cr0*4+so
beqlr /* nothing to do? */
mtctr r8
mr r3,r6
@ -58,6 +59,7 @@ V_FUNCTION_END(__kernel_sync_dicache)
*/
V_FUNCTION_BEGIN(__kernel_sync_dicache_p5)
.cfi_startproc
crclr cr0*4+so
sync
isync
li r3,0

3
arch/powerpc/kernel/vdso64/datapage.S
View file

@ -54,12 +54,12 @@ V_FUNCTION_BEGIN(__kernel_get_syscall_map)
.cfi_startproc
mflr r12
.cfi_register lr,r12
mr r4,r3
bl V_LOCAL_FUNC(__get_datapage)
mtlr r12
addi r3,r3,CFG_SYSCALL_MAP64
cmpli cr0,r4,0
crclr cr0*4+so
beqlr
li r0,__NR_syscalls
stw r0,0(r4)
@ -80,6 +80,7 @@ V_FUNCTION_BEGIN(__kernel_get_tbfreq)
bl V_LOCAL_FUNC(__get_datapage)
ld r3,CFG_TB_TICKS_PER_SEC(r3)
mtlr r12
crclr cr0*4+so
blr
.cfi_endproc
V_FUNCTION_END(__kernel_get_tbfreq)

4
arch/powerpc/kernel/vdso64/gettimeofday.S
View file

@ -52,6 +52,7 @@ V_FUNCTION_BEGIN(__kernel_gettimeofday)
stw r4,TZONE_TZ_MINWEST(r10)
stw r5,TZONE_TZ_DSTTIME(r10)
1: mtlr r12
crclr cr0*4+so
li r3,0 /* always success */
blr
.cfi_endproc
@ -99,6 +100,7 @@ V_FUNCTION_BEGIN(__kernel_clock_gettime)
std r0,TSPC64_TV_NSEC(r11) /* store nsec in tp */
mtlr r12
crclr cr0*4+so
li r3,0
blr
@ -159,6 +161,7 @@ V_FUNCTION_BEGIN(__kernel_clock_gettime)
std r7,TSPC64_TV_NSEC(r11)
mtlr r12
crclr cr0*4+so
li r3,0
blr
@ -193,6 +196,7 @@ V_FUNCTION_BEGIN(__kernel_clock_getres)
li r3,0
cmpli cr0,r4,0
crclr cr0*4+so
beqlr
lis r5,CLOCK_REALTIME_RES@h
ori r5,r5,CLOCK_REALTIME_RES@l

2
include/asm-powerpc/vdso.h
View file

@ -11,7 +11,7 @@
#define VDSO32_MBASE VDSO32_LBASE
#define VDSO64_MBASE VDSO64_LBASE
#define VDSO_VERSION_STRING LINUX_2.6.12
#define VDSO_VERSION_STRING LINUX_2.6.15
/* Define if 64 bits VDSO has procedure descriptors */
#undef VDS64_HAS_DESCRIPTORS