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arch/tile: fix up some minor trap handling issues

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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>
This commit is contained in:
Chris Metcalf 2012-03-29 15:23:54 -04:00
parent e17235382d
commit a714ffff36
2 changed files with 8 additions and 3 deletions
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2
arch/tile/kernel/intvec_64.S
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@ -1178,7 +1178,7 @@ 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

9
arch/tile/kernel/traps.c
View File

@ -200,7 +200,7 @@ 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. */
@ -223,6 +223,10 @@ 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))) {
@ -312,7 +316,8 @@ 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);
}