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

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>

6 files changed, 16 insertions, 2 deletions

diff --git a/arch/powerpc/kernel/vdso32/cacheflush.S b/arch/powerpc/kernel/vdso32/cacheflush.S
index c8db993574ee..09629aea3e47 100644
--- a/arch/powerpc/kernel/vdso32/cacheflush.S
+++ b/arch/powerpc/kernel/vdso32/cacheflush.S
@@ -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
diff --git a/arch/powerpc/kernel/vdso32/datapage.S b/arch/powerpc/kernel/vdso32/datapage.S
index f6b38472318d..4709f1d9542c 100644
--- a/arch/powerpc/kernel/vdso32/datapage.S
+++ b/arch/powerpc/kernel/vdso32/datapage.S
@@ -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)
diff --git a/arch/powerpc/kernel/vdso32/gettimeofday.S b/arch/powerpc/kernel/vdso32/gettimeofday.S
index 0a32a41d50b0..7eebff03a041 100644
--- a/arch/powerpc/kernel/vdso32/gettimeofday.S
+++ b/arch/powerpc/kernel/vdso32/gettimeofday.S
@@ -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
diff --git a/arch/powerpc/kernel/vdso64/cacheflush.S b/arch/powerpc/kernel/vdso64/cacheflush.S
index d4a0ad28d534..cb4ae0a5edd0 100644
--- a/arch/powerpc/kernel/vdso64/cacheflush.S
+++ b/arch/powerpc/kernel/vdso64/cacheflush.S
@@ -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
diff --git a/arch/powerpc/kernel/vdso64/datapage.S b/arch/powerpc/kernel/vdso64/datapage.S
index 6393e4137bc7..3b2dd7d0c1eb 100644
--- a/arch/powerpc/kernel/vdso64/datapage.S
+++ b/arch/powerpc/kernel/vdso64/datapage.S
@@ -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)
diff --git a/arch/powerpc/kernel/vdso64/gettimeofday.S b/arch/powerpc/kernel/vdso64/gettimeofday.S
index 1a89094715cc..ccaeda5136d1 100644
--- a/arch/powerpc/kernel/vdso64/gettimeofday.S
+++ b/arch/powerpc/kernel/vdso64/gettimeofday.S
@@ -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