diff options
| author | Chenghao Duan <duanchenghao@kylinos.cn> | 2025-12-31 15:19:20 +0800 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2025-12-31 15:19:20 +0800 |
| commit | 9bdc1ab5e4ce6f066119018d8f69631a46f9c5a0 (patch) | |
| tree | 1e18de94f13a0fc93636dc111bae517cf370b509 /arch/loongarch | |
| parent | 4cd641a79e69270a062777f64a0dd330abb9044a (diff) | |
LoongArch: Enable exception fixup for specific ADE subcode
This patch allows the LoongArch BPF JIT to handle recoverable memory
access errors generated by BPF_PROBE_MEM* instructions.
When a BPF program performs memory access operations, the instructions
it executes may trigger ADEM exceptions. The kernel’s built-in BPF
exception table mechanism (EX_TYPE_BPF) will generate corresponding
exception fixup entries in the JIT compilation phase; however, the
architecture-specific trap handling function needs to proactively call
the common fixup routine to achieve exception recovery.
do_ade(): fix EX_TYPE_BPF memory access exceptions for BPF programs,
ensure safe execution.
Relevant test cases: illegal address access tests in module_attach and
subprogs_extable of selftests/bpf.
Signed-off-by: Chenghao Duan <duanchenghao@kylinos.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'arch/loongarch')
| -rw-r--r-- | arch/loongarch/kernel/traps.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/loongarch/kernel/traps.c b/arch/loongarch/kernel/traps.c index 004b8ebf0051..5d49b742e3bf 100644 --- a/arch/loongarch/kernel/traps.c +++ b/arch/loongarch/kernel/traps.c @@ -535,10 +535,15 @@ out: asmlinkage void noinstr do_ade(struct pt_regs *regs) { irqentry_state_t state = irqentry_enter(regs); + unsigned int esubcode = FIELD_GET(CSR_ESTAT_ESUBCODE, regs->csr_estat); + + if ((esubcode == EXSUBCODE_ADEM) && fixup_exception(regs)) + goto out; die_if_kernel("Kernel ade access", regs); force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)regs->csr_badvaddr); +out: irqentry_exit(regs, state); } |