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| author | Max Filippov <jcmvbkbc@gmail.com> | 2022-05-13 12:40:54 +0200 |
|---|---|---|
| committer | Max Filippov <jcmvbkbc@gmail.com> | 2022-05-13 17:43:36 +0200 |
| commit | 408b1d3c0ec8e4f36603092573108a6d3daa07a8 (patch) | |
| tree | baf7efc59ea0d5514b5704a599f4b56ea5b6bc66 /arch/xtensa | |
| parent | xtensa/simdisk: fix proc_read_simdisk() (diff) | |
| download | linux-408b1d3c0ec8e4f36603092573108a6d3daa07a8.tar.xz linux-408b1d3c0ec8e4f36603092573108a6d3daa07a8.zip | |
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.c | 8 |
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. |