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| author |   Max Filippov <jcmvbkbc@gmail.com> | 2019-12-10 14:23:49 -0800 |
|---|---|---|
| committer | Max Filippov <jcmvbkbc@gmail.com> | 2022-05-01 19:51:21 -0700 |
| commit | a8f0c31fa87dcf9154c4209960f1dd1ed6a1aad8 (patch) | |
| tree | d32478a51694a14cbd5c80e6768ea0869647aa88 /arch/xtensa/kernel/traps.c | |
| parent | xtensa: extract vmalloc_fault code into a function (diff) | |
| download | linux-dev-a8f0c31fa87dcf9154c4209960f1dd1ed6a1aad8.tar.xz linux-dev-a8f0c31fa87dcf9154c4209960f1dd1ed6a1aad8.zip | |
xtensa: noMMU: allow handling protection faults
Many xtensa CPU cores without full MMU still have memory protection
features capable of raising exceptions for invalid instruction
fetches/data access. Allow handling such exceptions. This improves
behavior of processes that pass invalid memory pointers to syscalls in
noMMU configs: in case of exception the kernel instead of killing the
process is now able to return -EINVAL from a syscall.
Introduce CONFIG_PFAULT that controls whether protection fault code is
enabled and register handlers for common memory protection exceptions
when it is enabled.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch/xtensa/kernel/traps.c')
| -rw-r--r-- | arch/xtensa/kernel/traps.c | 20 |
1 files changed, 10 insertions, 10 deletions
diff --git a/arch/xtensa/kernel/traps.c b/arch/xtensa/kernel/traps.c index 9345007d474d..82ced7b25b77 100644 --- a/arch/xtensa/kernel/traps.c +++ b/arch/xtensa/kernel/traps.c @@ -110,21 +110,21 @@ static dispatch_init_table_t __initdata dispatch_init_table[] = { { EXCCAUSE_UNALIGNED, KRNL, fast_unaligned }, #endif #ifdef CONFIG_MMU -{ EXCCAUSE_ITLB_MISS, 0, do_page_fault }, -{ EXCCAUSE_ITLB_MISS, USER|KRNL, fast_second_level_miss}, +{ EXCCAUSE_ITLB_MISS, 0, do_page_fault }, +{ EXCCAUSE_ITLB_MISS, USER|KRNL, fast_second_level_miss}, +{ EXCCAUSE_DTLB_MISS, USER|KRNL, fast_second_level_miss}, +{ EXCCAUSE_DTLB_MISS, 0, do_page_fault }, +{ EXCCAUSE_STORE_CACHE_ATTRIBUTE, USER|KRNL, fast_store_prohibited }, +#endif /* CONFIG_MMU */ +#ifdef CONFIG_PFAULT { EXCCAUSE_ITLB_MULTIHIT, 0, do_multihit }, -{ EXCCAUSE_ITLB_PRIVILEGE, 0, do_page_fault }, -/* EXCCAUSE_SIZE_RESTRICTION unhandled */ +{ EXCCAUSE_ITLB_PRIVILEGE, 0, do_page_fault }, { EXCCAUSE_FETCH_CACHE_ATTRIBUTE, 0, do_page_fault }, -{ EXCCAUSE_DTLB_MISS, USER|KRNL, fast_second_level_miss}, -{ EXCCAUSE_DTLB_MISS, 0, do_page_fault }, { EXCCAUSE_DTLB_MULTIHIT, 0, do_multihit }, -{ EXCCAUSE_DTLB_PRIVILEGE, 0, do_page_fault }, -/* EXCCAUSE_DTLB_SIZE_RESTRICTION unhandled */ -{ EXCCAUSE_STORE_CACHE_ATTRIBUTE, USER|KRNL, fast_store_prohibited }, +{ EXCCAUSE_DTLB_PRIVILEGE, 0, do_page_fault }, { EXCCAUSE_STORE_CACHE_ATTRIBUTE, 0, do_page_fault }, { EXCCAUSE_LOAD_CACHE_ATTRIBUTE, 0, do_page_fault }, -#endif /* CONFIG_MMU */ +#endif /* XCCHAL_EXCCAUSE_FLOATING_POINT unhandled */ #if XTENSA_HAVE_COPROCESSOR(0) COPROCESSOR(0), |