[PATCH 6.18 060/175] LoongArch: Enable exception fixup for specific ADE subcode

Greg Kroah-Hartman
2026-02-09T14:28:23Z

From: Chenghao Duan <duanchenghao@kylinos.cn>

[ Upstream commit 9bdc1ab5e4ce6f066119018d8f69631a46f9c5a0 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/loongarch/kernel/traps.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/arch/loongarch/kernel/traps.c b/arch/loongarch/kernel/traps.c
index da5926fead4af..8e51ce004572c 100644
--- a/arch/loongarch/kernel/traps.c
+++ b/arch/loongarch/kernel/traps.c
@@ -535,10 +535,15 @@ asmlinkage void noinstr do_fpe(struct pt_regs *regs, unsigned long fcsr)
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);
}

--
2.51.0