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target/loongarch: Fix raise_mmu_exception() set wrong exception_index 

When the address is invalid address, We should set exception_index
according to MMUAccessType, and EXCCODE_ADEF need't update badinstr.
Otherwise, The system enters an infinite loop. e.g:
run test.c on system mode
test.c:
    #include<stdio.h>

    void (*func)(int *);

    int main()
    {
        int i = 8;
        void *ptr = (void *)0x4000000000000000;
        func = ptr;
        func(&i);
        return 0;
    }

Signed-off-by: Song Gao <gaosong@loongson.cn>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20221101073210.3934280-2-gaosong@loongson.cn>
master
Song Gao 2022-11-01 14:53:31 +08:00
parent a6b129c810
commit 8752b13060
No known key found for this signature in database
GPG Key ID: 40A2FFF239263EDF
2 changed files with 4 additions and 2 deletions
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1
target/loongarch/cpu.c
View File

@ -177,6 +177,7 @@ static void loongarch_cpu_do_interrupt(CPUState *cs)
}
QEMU_FALLTHROUGH;
case EXCCODE_PIF:
case EXCCODE_ADEF:
cause = cs->exception_index;
update_badinstr = 0;
break;

5
target/loongarch/tlb_helper.c
View File

@ -229,7 +229,8 @@ static void raise_mmu_exception(CPULoongArchState *env, target_ulong address,
switch (tlb_error) {
default:
case TLBRET_BADADDR:
cs->exception_index = EXCCODE_ADEM;
cs->exception_index = access_type == MMU_INST_FETCH
? EXCCODE_ADEF : EXCCODE_ADEM;
break;
case TLBRET_NOMATCH:
/* No TLB match for a mapped address */
@ -643,7 +644,7 @@ bool loongarch_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
CPULoongArchState *env = &cpu->env;
hwaddr physical;
int prot;
int ret = TLBRET_BADADDR;
int ret;
/* Data access */
ret = get_physical_address(env, &physical, &prot, address,