diff options
| author | Chris Metcalf <cmetcalf@tilera.com> | 2013-08-07 12:11:56 -0400 |
|---|---|---|
| committer | Chris Metcalf <cmetcalf@tilera.com> | 2013-08-13 16:26:13 -0400 |
| commit | 70d2b5958a04139fbffecf27791cf913dce8038e (patch) | |
| tree | 7df7a5b793bf53dfd319faac4f711487770511ef /arch/tile/kernel | |
| parent | dadf78bf0359ee87a9d0b19ce42dbce7d0a72a61 (diff) | |
tile: improve illegal translation interrupt handling
First, don't re-enable interrupts blindly in the Linux trap handler.
We already handle page faults this way; synchronous interrupts like
ILL_TRANS will fire even when interrupts are disabled, and we don't
want to re-enable interrupts in that case.
For ILL_TRANS, we now pass the ILL_VA_PC reason into the trap handler
so we can report it properly; this is the address that caused the
illegal translation trap. We print the address as part of the
pr_alert() message now if it's coming from the kernel.
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Diffstat (limited to 'arch/tile/kernel')
| -rw-r--r-- | arch/tile/kernel/intvec_64.S | 2 | ||||
| -rw-r--r-- | arch/tile/kernel/traps.c | 25 |
2 files changed, 16 insertions, 11 deletions
diff --git a/arch/tile/kernel/intvec_64.S b/arch/tile/kernel/intvec_64.S index 38a60f27707..562886db780 100644 --- a/arch/tile/kernel/intvec_64.S +++ b/arch/tile/kernel/intvec_64.S @@ -492,7 +492,7 @@ intvec_\vecname: mfspr r3, SPR_SYSTEM_SAVE_K_2 /* info about page fault */ .else .ifc \vecnum, INT_ILL_TRANS - mfspr r2, ILL_TRANS_REASON + mfspr r2, ILL_VA_PC .else .ifc \vecnum, INT_DOUBLE_FAULT mfspr r2, SPR_SYSTEM_SAVE_K_2 /* double fault info from HV */ diff --git a/arch/tile/kernel/traps.c b/arch/tile/kernel/traps.c index 5b19a23c890..a1bbc5de4d0 100644 --- a/arch/tile/kernel/traps.c +++ b/arch/tile/kernel/traps.c @@ -222,8 +222,9 @@ void __kprobes do_trap(struct pt_regs *regs, int fault_num, unsigned long address = 0; bundle_bits instr; - /* Re-enable interrupts. */ - local_irq_enable(); + /* Re-enable interrupts, if they were previously enabled. */ + if (!(regs->flags & PT_FLAGS_DISABLE_IRQ)) + local_irq_enable(); /* * If it hits in kernel mode and we can't fix it up, just exit the @@ -231,7 +232,8 @@ void __kprobes do_trap(struct pt_regs *regs, int fault_num, */ if (!user_mode(regs)) { const char *name; - if (fixup_exception(regs)) /* only UNALIGN_DATA in practice */ + char buf[100]; + if (fixup_exception(regs)) /* ILL_TRANS or UNALIGN_DATA */ return; if (fault_num >= 0 && fault_num < sizeof(int_name)/sizeof(int_name[0]) && @@ -239,10 +241,16 @@ void __kprobes do_trap(struct pt_regs *regs, int fault_num, name = int_name[fault_num]; else name = "Unknown interrupt"; - pr_alert("Kernel took bad trap %d (%s) at PC %#lx\n", - fault_num, name, regs->pc); if (fault_num == INT_GPV) - pr_alert("GPV_REASON is %#lx\n", reason); + snprintf(buf, sizeof(buf), "; GPV_REASON %#lx", reason); +#ifdef __tilegx__ + else if (fault_num == INT_ILL_TRANS) + snprintf(buf, sizeof(buf), "; address %#lx", reason); +#endif + else + buf[0] = '\0'; + pr_alert("Kernel took bad trap %d (%s) at PC %#lx%s\n", + fault_num, name, regs->pc, buf); show_regs(regs); do_exit(SIGKILL); /* FIXME: implement i386 die() */ return; @@ -324,11 +332,8 @@ void __kprobes do_trap(struct pt_regs *regs, int fault_num, fill_ra_stack(); signo = SIGSEGV; + address = reason; code = SEGV_MAPERR; - if (reason & SPR_ILL_TRANS_REASON__I_STREAM_VA_RMASK) - address = regs->pc; - else - address = 0; /* FIXME: GX: single-step for address */ break; } #endif |