From: Benjamin Herrenschmidt Date: Mon, 14 Nov 2005 03:55:58 +0000 (+1100) Subject: [PATCH] powerpc: vdso fixes (take #2) X-Git-Tag: v2.6.15-rc2~96^2~10 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0c37ec2aa88bd8a6aaeb284ff5c86f4c6d8e8469;p=linux-2.6 [PATCH] powerpc: vdso fixes (take #2) This fixes various errors in the new functions added in the vDSO's, I've now verified all functions on both 32 and 64 bits vDSOs. It also fix a sign extension bug getting the initial time of day at boot that could cause the monotonic clock value to be completely on bogus for 64 bits applications (with either the vDSO or the syscall) on powermacs. Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Paul Mackerras --- diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c index 4550eb4f4f..91538d2445 100644 --- a/arch/powerpc/kernel/asm-offsets.c +++ b/arch/powerpc/kernel/asm-offsets.c @@ -270,13 +270,15 @@ int main(void) DEFINE(TVAL64_TV_USEC, offsetof(struct timeval, tv_usec)); DEFINE(TVAL32_TV_SEC, offsetof(struct compat_timeval, tv_sec)); DEFINE(TVAL32_TV_USEC, offsetof(struct compat_timeval, tv_usec)); + DEFINE(TSPC64_TV_SEC, offsetof(struct timespec, tv_sec)); + DEFINE(TSPC64_TV_NSEC, offsetof(struct timespec, tv_nsec)); DEFINE(TSPC32_TV_SEC, offsetof(struct compat_timespec, tv_sec)); DEFINE(TSPC32_TV_NSEC, offsetof(struct compat_timespec, tv_nsec)); #else DEFINE(TVAL32_TV_SEC, offsetof(struct timeval, tv_sec)); DEFINE(TVAL32_TV_USEC, offsetof(struct timeval, tv_usec)); - DEFINE(TSPEC32_TV_SEC, offsetof(struct timespec, tv_sec)); - DEFINE(TSPEC32_TV_NSEC, offsetof(struct timespec, tv_nsec)); + DEFINE(TSPC32_TV_SEC, offsetof(struct timespec, tv_sec)); + DEFINE(TSPC32_TV_NSEC, offsetof(struct timespec, tv_nsec)); #endif /* timeval/timezone offsets for use by vdso */ DEFINE(TZONE_TZ_MINWEST, offsetof(struct timezone, tz_minuteswest)); diff --git a/arch/powerpc/kernel/vdso32/datapage.S b/arch/powerpc/kernel/vdso32/datapage.S index a08c26e878..f6b3847231 100644 --- a/arch/powerpc/kernel/vdso32/datapage.S +++ b/arch/powerpc/kernel/vdso32/datapage.S @@ -77,8 +77,9 @@ V_FUNCTION_BEGIN(__kernel_get_tbfreq) mflr r12 .cfi_register lr,r12 bl __get_datapage@local - lwz r3,CFG_TB_TICKS_PER_SEC(r3) lwz r4,(CFG_TB_TICKS_PER_SEC + 4)(r3) + lwz r3,CFG_TB_TICKS_PER_SEC(r3) mtlr r12 + 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 aeb5fc9b87..0a32a41d50 100644 --- a/arch/powerpc/kernel/vdso32/gettimeofday.S +++ b/arch/powerpc/kernel/vdso32/gettimeofday.S @@ -83,7 +83,7 @@ V_FUNCTION_BEGIN(__kernel_clock_gettime) /* Check for supported clock IDs */ cmpli cr0,r3,CLOCK_REALTIME cmpli cr1,r3,CLOCK_MONOTONIC - cror cr0,cr0,cr1 + cror cr0*4+eq,cr0*4+eq,cr1*4+eq bne cr0,99f mflr r12 /* r12 saves lr */ @@ -91,7 +91,7 @@ V_FUNCTION_BEGIN(__kernel_clock_gettime) mr r10,r3 /* r10 saves id */ mr r11,r4 /* r11 saves tp */ bl __get_datapage@local /* get data page */ - mr r9, r3 /* datapage ptr in r9 */ + mr r9,r3 /* datapage ptr in r9 */ beq cr1,50f /* if monotonic -> jump there */ /* @@ -173,10 +173,14 @@ V_FUNCTION_BEGIN(__kernel_clock_gettime) add r4,r4,r7 lis r5,NSEC_PER_SEC@h ori r5,r5,NSEC_PER_SEC@l - cmpli cr0,r4,r5 + cmpl cr0,r4,r5 + cmpli cr1,r4,0 blt 1f subf r4,r5,r4 addi r3,r3,1 +1: bge cr1,1f + addi r3,r3,-1 + add r4,r4,r5 1: stw r3,TSPC32_TV_SEC(r11) stw r4,TSPC32_TV_NSEC(r11) @@ -210,7 +214,7 @@ V_FUNCTION_BEGIN(__kernel_clock_getres) /* Check for supported clock IDs */ cmpwi cr0,r3,CLOCK_REALTIME cmpwi cr1,r3,CLOCK_MONOTONIC - cror cr0,cr0,cr1 + cror cr0*4+eq,cr0*4+eq,cr1*4+eq bne cr0,99f li r3,0 diff --git a/arch/powerpc/kernel/vdso64/datapage.S b/arch/powerpc/kernel/vdso64/datapage.S index e67eda0f8c..6393e4137b 100644 --- a/arch/powerpc/kernel/vdso64/datapage.S +++ b/arch/powerpc/kernel/vdso64/datapage.S @@ -80,5 +80,6 @@ V_FUNCTION_BEGIN(__kernel_get_tbfreq) bl V_LOCAL_FUNC(__get_datapage) ld r3,CFG_TB_TICKS_PER_SEC(r3) mtlr r12 + 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 d371c02a8c..1a89094715 100644 --- a/arch/powerpc/kernel/vdso64/gettimeofday.S +++ b/arch/powerpc/kernel/vdso64/gettimeofday.S @@ -1,4 +1,5 @@ -/* + + /* * Userland implementation of gettimeofday() for 64 bits processes in a * ppc64 kernel for use in the vDSO * @@ -68,7 +69,7 @@ V_FUNCTION_BEGIN(__kernel_clock_gettime) /* Check for supported clock IDs */ cmpwi cr0,r3,CLOCK_REALTIME cmpwi cr1,r3,CLOCK_MONOTONIC - cror cr0,cr0,cr1 + cror cr0*4+eq,cr0*4+eq,cr1*4+eq bne cr0,99f mflr r12 /* r12 saves lr */ @@ -84,16 +85,17 @@ V_FUNCTION_BEGIN(__kernel_clock_gettime) bl V_LOCAL_FUNC(__do_get_xsec) /* get xsec from tb & kernel */ - lis r7,0x3b9a /* r7 = 1000000000 = NSEC_PER_SEC */ - ori r7,r7,0xca00 + lis r7,15 /* r7 = 1000000 = USEC_PER_SEC */ + ori r7,r7,16960 rldicl r5,r4,44,20 /* r5 = sec = xsec / XSEC_PER_SEC */ rldicr r6,r5,20,43 /* r6 = sec * XSEC_PER_SEC */ std r5,TSPC64_TV_SEC(r11) /* store sec in tv */ subf r0,r6,r4 /* r0 = xsec = (xsec - r6) */ - mulld r0,r0,r7 /* nsec = (xsec * NSEC_PER_SEC) / + mulld r0,r0,r7 /* usec = (xsec * USEC_PER_SEC) / * XSEC_PER_SEC */ rldicl r0,r0,44,20 + mulli r0,r0,1000 /* nsec = usec * 1000 */ std r0,TSPC64_TV_NSEC(r11) /* store nsec in tp */ mtlr r12 @@ -106,15 +108,16 @@ V_FUNCTION_BEGIN(__kernel_clock_gettime) 50: bl V_LOCAL_FUNC(__do_get_xsec) /* get xsec from tb & kernel */ - lis r7,0x3b9a /* r7 = 1000000000 = NSEC_PER_SEC */ - ori r7,r7,0xca00 + lis r7,15 /* r7 = 1000000 = USEC_PER_SEC */ + ori r7,r7,16960 rldicl r5,r4,44,20 /* r5 = sec = xsec / XSEC_PER_SEC */ rldicr r6,r5,20,43 /* r6 = sec * XSEC_PER_SEC */ subf r0,r6,r4 /* r0 = xsec = (xsec - r6) */ - mulld r0,r0,r7 /* nsec = (xsec * NSEC_PER_SEC) / + mulld r0,r0,r7 /* usec = (xsec * USEC_PER_SEC) / * XSEC_PER_SEC */ rldicl r6,r0,44,20 + mulli r6,r6,1000 /* nsec = usec * 1000 */ /* now we must fixup using wall to monotonic. We need to snapshot * that value and do the counter trick again. Fortunately, we still @@ -123,8 +126,8 @@ V_FUNCTION_BEGIN(__kernel_clock_gettime) * can be used */ - lwz r4,WTOM_CLOCK_SEC(r9) - lwz r7,WTOM_CLOCK_NSEC(r9) + lwa r4,WTOM_CLOCK_SEC(r3) + lwa r7,WTOM_CLOCK_NSEC(r3) /* We now have our result in r4,r7. We create a fake dependency * on that result and re-check the counter @@ -144,10 +147,14 @@ V_FUNCTION_BEGIN(__kernel_clock_gettime) add r7,r7,r6 lis r9,NSEC_PER_SEC@h ori r9,r9,NSEC_PER_SEC@l - cmpli cr0,r7,r9 + cmpl cr0,r7,r9 + cmpli cr1,r7,0 blt 1f subf r7,r9,r7 addi r4,r4,1 +1: bge cr1,1f + addi r4,r4,-1 + add r7,r7,r9 1: std r4,TSPC64_TV_SEC(r11) std r7,TSPC64_TV_NSEC(r11) @@ -181,7 +188,7 @@ V_FUNCTION_BEGIN(__kernel_clock_getres) /* Check for supported clock IDs */ cmpwi cr0,r3,CLOCK_REALTIME cmpwi cr1,r3,CLOCK_MONOTONIC - cror cr0,cr0,cr1 + cror cr0*4+eq,cr0*4+eq,cr1*4+eq bne cr0,99f li r3,0 diff --git a/arch/powerpc/platforms/powermac/time.c b/arch/powerpc/platforms/powermac/time.c index 5947b21a85..4c7682a652 100644 --- a/arch/powerpc/platforms/powermac/time.c +++ b/arch/powerpc/platforms/powermac/time.c @@ -102,7 +102,7 @@ static unsigned long from_rtc_time(struct rtc_time *tm) static unsigned long cuda_get_time(void) { struct adb_request req; - unsigned long now; + unsigned int now; if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_GET_TIME) < 0) return 0; @@ -113,7 +113,7 @@ static unsigned long cuda_get_time(void) req.reply_len); now = (req.reply[3] << 24) + (req.reply[4] << 16) + (req.reply[5] << 8) + req.reply[6]; - return now - RTC_OFFSET; + return ((unsigned long)now) - RTC_OFFSET; } #define cuda_get_rtc_time(tm) to_rtc_time(cuda_get_time(), (tm)) @@ -146,7 +146,7 @@ static int cuda_set_rtc_time(struct rtc_time *tm) static unsigned long pmu_get_time(void) { struct adb_request req; - unsigned long now; + unsigned int now; if (pmu_request(&req, NULL, 1, PMU_READ_RTC) < 0) return 0; @@ -156,7 +156,7 @@ static unsigned long pmu_get_time(void) req.reply_len); now = (req.reply[0] << 24) + (req.reply[1] << 16) + (req.reply[2] << 8) + req.reply[3]; - return now - RTC_OFFSET; + return ((unsigned long)now) - RTC_OFFSET; } #define pmu_get_rtc_time(tm) to_rtc_time(pmu_get_time(), (tm)) diff --git a/include/asm-powerpc/vdso_datapage.h b/include/asm-powerpc/vdso_datapage.h index fc323b5136..411832d5bb 100644 --- a/include/asm-powerpc/vdso_datapage.h +++ b/include/asm-powerpc/vdso_datapage.h @@ -73,7 +73,7 @@ struct vdso_data { /* those additional ones don't have to be located anywhere * special as they were not part of the original systemcfg */ - __s64 wtom_clock_sec; /* Wall to monotonic clock */ + __s32 wtom_clock_sec; /* Wall to monotonic clock */ __s32 wtom_clock_nsec; __u32 syscall_map_64[SYSCALL_MAP_SIZE]; /* map of syscalls */ __u32 syscall_map_32[SYSCALL_MAP_SIZE]; /* map of syscalls */