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authorMax Filippov <jcmvbkbc@gmail.com>2022-05-13 03:40:54 -0700
committerMax Filippov <jcmvbkbc@gmail.com>2022-05-13 08:43:36 -0700
commit408b1d3c0ec8e4f36603092573108a6d3daa07a8 (patch)
treebaf7efc59ea0d5514b5704a599f4b56ea5b6bc66 /arch/xtensa
parentb011946d039d66bbc7102137e98cc67e1356aa87 (diff)
downloadlinux-408b1d3c0ec8e4f36603092573108a6d3daa07a8.tar.bz2
xtensa: add trap handler for division by zero
Add c-level handler for the division by zero exception and kill the task if it was thrown from the kernel space or send SIGFPE otherwise. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch/xtensa')
-rw-r--r--arch/xtensa/kernel/traps.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/xtensa/kernel/traps.c b/arch/xtensa/kernel/traps.c
index 138a86fbe9d7..24d11b44fa57 100644
--- a/arch/xtensa/kernel/traps.c
+++ b/arch/xtensa/kernel/traps.c
@@ -49,6 +49,7 @@
*/
static void do_illegal_instruction(struct pt_regs *regs);
+static void do_div0(struct pt_regs *regs);
static void do_interrupt(struct pt_regs *regs);
#if XTENSA_FAKE_NMI
static void do_nmi(struct pt_regs *regs);
@@ -95,7 +96,7 @@ static dispatch_init_table_t __initdata dispatch_init_table[] = {
#ifdef SUPPORT_WINDOWED
{ EXCCAUSE_ALLOCA, USER|KRNL, fast_alloca },
#endif
-/* EXCCAUSE_INTEGER_DIVIDE_BY_ZERO unhandled */
+{ EXCCAUSE_INTEGER_DIVIDE_BY_ZERO, 0, do_div0 },
/* EXCCAUSE_PRIVILEGED unhandled */
#if XCHAL_UNALIGNED_LOAD_EXCEPTION || XCHAL_UNALIGNED_STORE_EXCEPTION
#ifdef CONFIG_XTENSA_UNALIGNED_USER
@@ -307,6 +308,11 @@ static void do_illegal_instruction(struct pt_regs *regs)
force_sig(SIGILL);
}
+static void do_div0(struct pt_regs *regs)
+{
+ __die_if_kernel("Unhandled division by 0 in kernel", regs, SIGKILL);
+ force_sig_fault(SIGFPE, FPE_INTDIV, (void __user *)regs->pc);
+}
/*
* Handle unaligned memory accesses from user space. Kill task.