From 687304014f7ca8e2fbb3feaefef356b4a0da65ad Mon Sep 17 00:00:00 2001 From: Olof Johansson Date: Tue, 24 Apr 2007 01:11:55 +1000 Subject: [POWERPC] Save trap number in bad_stack Save the trap number in the case of getting a bad stack in an exception handler. It is sometimes useful to know what exception it was that caused this to happen. Without this, no trap number is reported. Signed-off-by: Olof Johansson Signed-off-by: Paul Mackerras --- arch/powerpc/kernel/asm-offsets.c | 1 + arch/powerpc/kernel/head_64.S | 10 ++++++++-- 2 files changed, 9 insertions(+), 2 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c index 9735e828b52d..0c5150c69175 100644 --- a/arch/powerpc/kernel/asm-offsets.c +++ b/arch/powerpc/kernel/asm-offsets.c @@ -139,6 +139,7 @@ int main(void) DEFINE(PACA_SYSTEM_TIME, offsetof(struct paca_struct, system_time)); DEFINE(PACA_SLBSHADOWPTR, offsetof(struct paca_struct, slb_shadow_ptr)); DEFINE(PACA_DATA_OFFSET, offsetof(struct paca_struct, data_offset)); + DEFINE(PACA_TRAP_SAVE, offsetof(struct paca_struct, trap_save)); DEFINE(SLBSHADOW_STACKVSID, offsetof(struct slb_shadow, save_area[SLB_NUM_BOLTED - 1].vsid)); diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S index aff5398a5f63..1111fcec7673 100644 --- a/arch/powerpc/kernel/head_64.S +++ b/arch/powerpc/kernel/head_64.S @@ -278,8 +278,12 @@ exception_marker: beq- 1f; \ ld r1,PACAKSAVE(r13); /* kernel stack to use */ \ 1: cmpdi cr1,r1,0; /* check if r1 is in userspace */ \ - bge- cr1,bad_stack; /* abort if it is */ \ - std r9,_CCR(r1); /* save CR in stackframe */ \ + bge- cr1,2f; /* abort if it is */ \ + b 3f; \ +2: li r1,(n); /* will be reloaded later */ \ + sth r1,PACA_TRAP_SAVE(r13); \ + b bad_stack; \ +3: std r9,_CCR(r1); /* save CR in stackframe */ \ std r11,_NIP(r1); /* save SRR0 in stackframe */ \ std r12,_MSR(r1); /* save SRR1 in stackframe */ \ std r10,0(r1); /* make stack chain pointer */ \ @@ -940,6 +944,8 @@ bad_stack: SAVE_2GPRS(7,r1) SAVE_10GPRS(12,r1) SAVE_10GPRS(22,r1) + lhz r12,PACA_TRAP_SAVE(r13) + std r12,_TRAP(r1) addi r11,r1,INT_FRAME_SIZE std r11,0(r1) li r12,0 -- cgit v1.2.3