From 5d66da3d71e6aeca80ca08dbebd8a1cd72e6ee1f Mon Sep 17 00:00:00 2001 From: Benjamin Herrenschmidt Date: Wed, 16 Nov 2005 13:54:32 +1100 Subject: [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 Signed-off-by: Paul Mackerras diff --git a/arch/powerpc/kernel/vdso32/cacheflush.S b/arch/powerpc/kernel/vdso32/cacheflush.S index c8db993..09629ae 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 f6b3847..4709f1d 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 0a32a41..7eebff0 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 d4a0ad2..cb4ae0a 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 6393e41..3b2dd7d 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 1a89094..ccaeda5 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 diff --git a/include/asm-powerpc/vdso.h b/include/asm-powerpc/vdso.h index 85d8a7b..b9f9118 100644 --- a/include/asm-powerpc/vdso.h +++ b/include/asm-powerpc/vdso.h @@ -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 -- cgit v0.10.2