[Bug target/82820] [arm32]ldm/stm instructions Bus error while running with 64bit kernel

[zwzhangwen.zhang at huawei dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82820

--- Comment #2 from zwzhangwen.zhang at huawei dot com ---
Hi,
   I have a testcase for example:
typedef struct structA{
    int a;
    int b;
    int c;
}A;

typedef struct structB{
    int iData;
    A a;
}B;

int test(A aa)
{
    aa.a = 123;
    aa.b = 321;
    aa.c = 213;
    printf("\r\n line:%d func:%s [%d][%d][%d]\r\n", __LINE__, __FUNCTION__,
aa.a, aa.b, aa.c);
}

int main()
{
    char buf[1024];
    A aaa = {1,2,3};

    B *pb = (B *)(buf + 1);
    pb->a = aaa;
    test(pb->a);
    return 0;
}
compiling with the command "arm32-linux-gnueabi-gcc -O0 test.c "
Then objdump assemble is as follows:
...
    85ac:       e51b3008        ldr     r3, [fp, #-8]
    85b0:       e2833004        add     r3, r3, #4
    85b4:       e24b2e41        sub     r2, fp, #1040   ; 0x410
    85b8:       e2422004        sub     r2, r2, #4
    85bc:       e8920007        ldm     r2, {r0, r1, r2}
    85c0:       e8830007        stm     r3, {r0, r1, r2}
    85c4:       e51b3008        ldr     r3, [fp, #-8]
    85c8:       e2833004        add     r3, r3, #4
    85cc:       e8930007        ldm     r3, {r0, r1, r2}
    85d0:       ebffffcd        bl      850c <test>
...
pb->a is unaligned access but inst. is ldm/stm  and this is a prolem.
The other problem is the elf has bus error on arm64 env,
So anybody help me?
Thank you.