On 2026/3/5 下午9:54, Andrew S. Rightenburg via qemu development wrote:
From: rail5 <[email protected]> loongarch_cpu_do_interrupt() updates CSR_BADI by fetching the faulting instruction with cpu_ldl_code_mmu(). For a PNX exception (instruction fetch prohibited by NX), fetching the instruction at env->pc will fault with PNX again. This can lead to an infinite exception loop. Treat PNX like other instruction-fetch exceptions (PIF/ADEF) and do not update CSR_BADI for it. Fixes: 410dfbf620a ("target/loongarch: Move TCG specified functions to tcg_cpu.c") Cc: [email protected] Signed-off-by: rail5 (Andrew S. Rightenburg) <[email protected]> --- target/loongarch/tcg/tcg_cpu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/target/loongarch/tcg/tcg_cpu.c b/target/loongarch/tcg/tcg_cpu.c index af92277669..31d3db6e8e 100644 --- a/target/loongarch/tcg/tcg_cpu.c +++ b/target/loongarch/tcg/tcg_cpu.c @@ -109,6 +109,7 @@ static void loongarch_cpu_do_interrupt(CPUState *cs) } QEMU_FALLTHROUGH; case EXCCODE_PIF: + case EXCCODE_PNX: case EXCCODE_ADEF: cause = cs->exception_index; update_badinstr = 0; @@ -129,7 +130,6 @@ static void loongarch_cpu_do_interrupt(CPUState *cs) case EXCCODE_PIS: case EXCCODE_PME: case EXCCODE_PNR: - case EXCCODE_PNX: case EXCCODE_PPI: cause = cs->exception_index; break;
Reviewed-by: Bibo Mao <[email protected]>
