Le 18/04/2018 à 11:02, Naveen N. Rao a écrit :
Print a small help text indicating the exception vector alongside the
trap number to make it easier while analyzing back traces. As an
example:
Unable to handle kernel paging request for data at address 0x00000000
Faulting instruction address: 0xc0000000006e3728
Oops: Kernel access of bad area, sig: 11 [#1]
LE SMP NR_CPUS=2048 NUMA PowerNV
Modules linked in:
CPU: 0 PID: 1 Comm: bash Not tainted 4.16.0-nnr #226
NIP: c0000000006e3728 LR: c0000000006e4774 CTR: c0000000006e3700
REGS: c0000000f0aa3980 TRAP: 0300 (DSI) Not tainted (4.16.0-nnr)
MSR: 9000000000009033 <SF,HV,EE,ME,IR,DR,RI,LE> CR: 28222222 XER:
20000000
CFAR: c0000000006e4770 DAR: 0000000000000000 DSISR: 42000000 SOFTE: 0
Signed-off-by: Naveen N. Rao <naveen.n....@linux.vnet.ibm.com>
---
I find this useful to have in backtraces, instead of having to look it
up. Some of the names could probably be tweaked a bit to be more
sensible.
- Naveen
arch/powerpc/kernel/process.c | 42 +++++++++++++++++++++++++++++++++++
1 file changed, 42 insertions(+)
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 1237f13fed51..71bfe29af456 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -1414,6 +1414,42 @@ static void print_msr_bits(unsigned long val)
#define LAST_VOLATILE 12
#endif
+#ifdef CONFIG_PPC_BOOK3S_64
Why not make something generic applicable to all platforms ?
Christophe
+static char *print_trap(unsigned long trapno)
+{
+ trapno &= 0xff0;
+ switch (trapno) {
+ case 0x100: return "SRESET";
+ case 0x200: return "MCE";
+ case 0x300: return "DSI";
+ case 0x380: return "DSISLB";
+ case 0x400: return "ISI";
+ case 0x480: return "ISISLB";
+ case 0x500: return "EXT";
+ case 0x600: return "ALIGN";
+ case 0x700: return "PCHECK";
+ case 0x800: return "FP";
+ case 0x900: return "DEC";
+ case 0x980: return "HDEC";
+ case 0xa00: return "DBELL";
+ case 0xc00: return "SC";
+ case 0xd00: return "SSTEP";
+ case 0xe00: return "HDSI";
+ case 0xe20: return "HISI";
+ case 0xe40: return "HEMUL";
+ case 0xe60: return "HMI";
+ case 0xe80: return "HDBELL";
+ case 0xea0: return "HVIRT";
+ case 0xf00: return "PMI";
+ case 0xf20: return "ALTIVEC";
+ case 0xf40: return "VSX";
+ case 0xf60: return "UNAVAIL";
+ case 0xf80: return "HUNAVAIL";
+ }
+ return "UNKNOWN";
+}
+#endif
+
void show_regs(struct pt_regs * regs)
{
int i, trap;
@@ -1422,8 +1458,14 @@ void show_regs(struct pt_regs * regs)
printk("NIP: "REG" LR: "REG" CTR: "REG"\n",
regs->nip, regs->link, regs->ctr);
+#ifdef CONFIG_PPC_BOOK3S_64
+ printk("REGS: %px TRAP: %04lx (%s) %s (%s)\n",
+ regs, regs->trap, print_trap(regs->trap), print_tainted(),
+ init_utsname()->release);
+#else
printk("REGS: %px TRAP: %04lx %s (%s)\n",
regs, regs->trap, print_tainted(), init_utsname()->release);
+#endif
printk("MSR: "REG" ", regs->msr);
print_msr_bits(regs->msr);
pr_cont(" CR: %08lx XER: %08lx\n", regs->ccr, regs->xer);
