Re: [PATCH 03/14] add mach_host tests

[Samuel Thibault]

Luca, le sam. 06 janv. 2024 19:41:17 +0100, a ecrit:
> Il 29/12/23 15:14, Luca Dariz ha scritto:
> > Il 29/12/23 14:44, Samuel Thibault ha scritto:
> > > Also, it would be useful to compile the tests with
> > > -ftrivial-auto-var-init=pattern so as to fill the structures with random
> > > values before making the gnumach calls.
> 
> with this option all tests fail on the first mig-generated stub entry, which
> is task_get_special_port(), in _start(). Maybe it's related to SSE somehow,
> I see a page fault here:

Is $rbp unaligned?

(we do want to fix such bug anyway)

> (gdb) disassemble task_get_special_port
> Dump of assembler code for function task_get_special_port:
>    0x0000000000416bc6 <+0>:   push   %rbp
>    0x0000000000416bc7 <+1>:   mov    %rsp,%rbp
>    0x0000000000416bca <+4>:   sub    $0xa0,%rsp
>    0x0000000000416bd1 <+11>:  mov    %edi,-0x94(%rbp)
>    0x0000000000416bd7 <+17>:  mov    %esi,-0x98(%rbp)
>    0x0000000000416bdd <+23>:  mov    %rdx,-0xa0(%rbp)
>    0x0000000000416be4 <+30>:  lea    -0x60(%rbp),%rax
>    0x0000000000416be8 <+34>:  movdqa 0x124f0(%rip),%xmm0        # 0x4290e0
> => 0x0000000000416bf0 <+42>:  movaps %xmm0,(%rax)
>    0x0000000000416bf3 <+45>:  movaps %xmm0,0x10(%rax)

Samuel