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authorGraf Yang <graf.yang@analog.com>2009-07-22 13:56:24 +0200
committerMike Frysinger <vapier@gentoo.org>2009-09-17 03:31:57 +0200
commit01b9f4b0ed3b1111b2080a3c9bcb66df1fdf48b7 (patch)
tree0963b346d63cc7ee44e3e769cc8435d224e17a87 /arch/blackfin/kernel/traps.c
parentBlackfin: bf533-stamp: fix typo in SPI frequency for ad1836 codec (diff)
downloadlinux-01b9f4b0ed3b1111b2080a3c9bcb66df1fdf48b7.tar.xz
linux-01b9f4b0ed3b1111b2080a3c9bcb66df1fdf48b7.zip
Blackfin: improve double fault debug handling
Since the hardware only provides reporting for the last exception handled, and the values are valid only when executing the exception handler, we need to save the context for reporting at a later point. While we do this for one exception, it doesn't work properly when handling a second one as the original exception is clobbered by the double fault. So when double fault debugging is enabled, create a dedicated shadow of these values and save/restore out of there. Now the crash report properly displays the first exception as well as the second one. Signed-off-by: Graf Yang <graf.yang@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'arch/blackfin/kernel/traps.c')
-rw-r--r--arch/blackfin/kernel/traps.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/blackfin/kernel/traps.c b/arch/blackfin/kernel/traps.c
index 644e35e33553..0904430d4137 100644
--- a/arch/blackfin/kernel/traps.c
+++ b/arch/blackfin/kernel/traps.c
@@ -229,12 +229,12 @@ asmlinkage void double_fault_c(struct pt_regs *fp)
if (((long)fp->seqstat & SEQSTAT_EXCAUSE) == VEC_UNCOV) {
unsigned int cpu = smp_processor_id();
char buf[150];
- decode_address(buf, cpu_pda[cpu].retx);
+ decode_address(buf, cpu_pda[cpu].retx_doublefault);
printk(KERN_EMERG "While handling exception (EXCAUSE = 0x%x) at %s:\n",
- (unsigned int)cpu_pda[cpu].seqstat & SEQSTAT_EXCAUSE, buf);
- decode_address(buf, cpu_pda[cpu].dcplb_fault_addr);
+ (unsigned int)cpu_pda[cpu].seqstat_doublefault & SEQSTAT_EXCAUSE, buf);
+ decode_address(buf, cpu_pda[cpu].dcplb_doublefault_addr);
printk(KERN_NOTICE " DCPLB_FAULT_ADDR: %s\n", buf);
- decode_address(buf, cpu_pda[cpu].icplb_fault_addr);
+ decode_address(buf, cpu_pda[cpu].icplb_doublefault_addr);
printk(KERN_NOTICE " ICPLB_FAULT_ADDR: %s\n", buf);
decode_address(buf, fp->retx);