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arm64: don't kill the kernel on a bad esr from el0 

Rather than completely killing the kernel if we receive an esr value we
can't deal with in the el0 handlers, send the process a SIGILL and log
the esr value in the hope that we can debug it. If we receive a bad esr
from el1, we'll die() as before.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: stable@vger.kernel.org
hifive-unleashed-5.1
Mark Rutland 2013-05-28 15:54:15 +01:00 committed by Catalin Marinas
parent 381cc2b970
commit 9955ac47f4
1 changed files with 9 additions and 3 deletions
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12
arch/arm64/kernel/traps.c
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@ -311,14 +311,20 @@ asmlinkage long do_ni_syscall(struct pt_regs *regs)
*/ */
asmlinkage void bad_mode(struct pt_regs *regs, int reason, unsigned int esr) asmlinkage void bad_mode(struct pt_regs *regs, int reason, unsigned int esr)
{ {
siginfo_t info;
void __user *pc = (void __user *)instruction_pointer(regs);
console_verbose(); console_verbose();
pr_crit("Bad mode in %s handler detected, code 0x%08x\n", pr_crit("Bad mode in %s handler detected, code 0x%08x\n",
handler[reason], esr); handler[reason], esr);
__show_regs(regs);
die("Oops - bad mode", regs, 0); info.si_signo = SIGILL;
local_irq_disable(); info.si_errno = 0;
panic("bad mode"); info.si_code = ILL_ILLOPC;
info.si_addr = pc;
arm64_notify_die("Oops - bad mode", regs, &info, 0);
} }
void __pte_error(const char *file, int line, unsigned long val) void __pte_error(const char *file, int line, unsigned long val)