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Subject[PATCH] arch/tile: improve trap handling a bit
We now respond to MEM_ERROR traps (e.g. an atomic instruction to
non-cacheable memory) with a SIGBUS.

We also no longer generate a console crash message if a user
process die due to a SIGTRAP.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
---
arch/tile/kernel/intvec_64.S | 2 +-
arch/tile/kernel/traps.c | 9 +++++++--
2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/arch/tile/kernel/intvec_64.S b/arch/tile/kernel/intvec_64.S
index 709e224..6a1ea82 100644
--- a/arch/tile/kernel/intvec_64.S
+++ b/arch/tile/kernel/intvec_64.S
@@ -1186,7 +1186,7 @@ STD_ENTRY(fill_ra_stack)
#define do_hardwall_trap bad_intr
#endif

- int_hand INT_MEM_ERROR, MEM_ERROR, bad_intr
+ int_hand INT_MEM_ERROR, MEM_ERROR, do_trap
int_hand INT_SINGLE_STEP_3, SINGLE_STEP_3, bad_intr
#if CONFIG_KERNEL_PL == 2
int_hand INT_SINGLE_STEP_2, SINGLE_STEP_2, gx_singlestep_handle
diff --git a/arch/tile/kernel/traps.c b/arch/tile/kernel/traps.c
index 1e91fda..4c33057 100644
--- a/arch/tile/kernel/traps.c
+++ b/arch/tile/kernel/traps.c
@@ -199,7 +199,7 @@ void __kprobes do_trap(struct pt_regs *regs, int fault_num,
{
siginfo_t info = { 0 };
int signo, code;
- unsigned long address;
+ unsigned long address = 0;
bundle_bits instr;

/* Re-enable interrupts. */
@@ -222,6 +222,10 @@ void __kprobes do_trap(struct pt_regs *regs, int fault_num,
}

switch (fault_num) {
+ case INT_MEM_ERROR:
+ signo = SIGBUS;
+ code = BUS_OBJERR;
+ break;
case INT_ILL:
if (copy_from_user(&instr, (void __user *)regs->pc,
sizeof(instr))) {
@@ -311,7 +315,8 @@ void __kprobes do_trap(struct pt_regs *regs, int fault_num,
info.si_addr = (void __user *)address;
if (signo == SIGILL)
info.si_trapno = fault_num;
- trace_unhandled_signal("trap", regs, address, signo);
+ if (signo != SIGTRAP)
+ trace_unhandled_signal("trap", regs, address, signo);
force_sig_info(signo, &info, current);
}

--
1.6.5.2


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