[llvm-dev] Is shadow call stack in llvm 7 ok?

[PenYiWang via llvm-dev]

Hi

I try the shadow call stack in llvm.

clang -fsanitize=shadow-call-stack  ./test.c

test.c
#include<stdio.h>

void A(){
        printf("A\n");
}

int main(){
        A();
        return 0;
}

And then produe weird code

0000000000400570 <main>:
  400570:       4c 8b 14 24             mov    r10,QWORD PTR [rsp]
  400574:       4d 31 db                xor    r11,r11
  400577:       65 49 83 03 08          add    QWORD PTR gs:[r11],0x8
  40057c:       65 4d 8b 1b             mov    r11,QWORD PTR gs:[r11]
  400580:       65 4d 89 13             mov    QWORD PTR gs:[r11],r10

at 0x400577 the program crashes

because  r11 is 0 after  0x400574 .

I wonder that shadow call stack in llvm 7 is ok now?

Thank you.
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