[Tinycc-devel] Seg fault when compiling with -nostdlib

[Konstantinos Agiannis]

The following program causes segmentation fault during compilation tcc -nostdlib

#include <unistd.h>
#include <sys/syscall.h>

void _start()
{
    register int    syscall_no  asm("rax") = 1;
  register int    arg1        asm("rdi") = 1;
  register char*  arg2        asm("rsi") = "hello, world!\n";
  register int    arg3        asm("rdx") = 14;
  asm("syscall");
        
        asm("movl $1,%eax;"
        "xorl %ebx,%ebx;"
        "int  $0x80"
    );
}

gcc and clang work normally.
Tested debian buster with tcc 0.9.27

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