From: Max Filippov <jcmvbkbc@gmail.com>
To: linux-xtensa@linux-xtensa.org
Cc: Chris Zankel <chris@zankel.net>,
linux-kernel@vger.kernel.org, Max Filippov <jcmvbkbc@gmail.com>
Subject: [PATCH 1/2] xtensa: add trap handler for division by zero
Date: Fri, 13 May 2022 08:41:50 -0700 [thread overview]
Message-ID: <20220513154151.4135905-2-jcmvbkbc@gmail.com> (raw)
In-Reply-To: <20220513154151.4135905-1-jcmvbkbc@gmail.com>
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>
---
arch/xtensa/kernel/traps.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/arch/xtensa/kernel/traps.c b/arch/xtensa/kernel/traps.c
index d3e91ceb0775..7c7c4c7b33bb 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.
--
2.30.2
next prev parent reply other threads:[~2022-05-13 15:42 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-13 15:41 [PATCH 0/2] xtensa: add division by zero exception handler Max Filippov
2022-05-13 15:41 ` Max Filippov [this message]
2022-05-13 15:41 ` [PATCH 2/2] xtensa: support artificial division by 0 exception Max Filippov
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