Re: [PATCH] /target/i386: fix gdbstub k_gs_base issue

[Philippe Mathieu-Daudé]

Hi Marek,

If you look at the other patches, you'll notice no leading slash is 
used, so please remove it when resending.

Maybe you can use "target/i386: Fix handling of k_gs_base register in 
32-bit mode in gdbstub" as patch subject.

Please Cc the maintainers. See:
https://wiki.qemu.org/Contribute/SubmitAPatch#CC_the_relevant_maintainer
Doing it for you now (adding Richard and Eduardo).

On 12/27/19 3:41 AM, Marek Dolata - address@hidden wrote:
> Fixes: corrects clobbering of registers appearing after k_gs_base
>
> Buglink: https://bugs.launchpad.net/qemu/+bug/1857640
>
> Signed-off-by: Marek Dolata <address@hidden>
>
> ---
>
> target/i386/gdbstub.c | 4 +++-
>
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/target/i386/gdbstub.c b/target/i386/gdbstub.c
>
> index aef25b70f1..7228d20674 100644
>
> --- a/target/i386/gdbstub.c
>
> +++ b/target/i386/gdbstub.c

I am having troubles trying to apply your patch:

Applying: /target/i386: fix gdbstub k_gs_base issue
error: corrupt patch at line 23
Patch failed at 0001 /target/i386: fix gdbstub k_gs_base issue
hint: Use 'git am --show-current-patch' to see the failed patch
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

The information on the wiki might help you to use proper format:
https://wiki.qemu.org/Contribute/SubmitAPatch#Use_git_format-patch

> @@ -350,14 +350,16 @@ int x86_cpu_gdb_write_register(CPUState *cs, 
> uint8_t *mem_buf, int n)
>
>               env->segs[R_GS].base = ldl_p(mem_buf);
>
>               return 4;
>
> -#ifdef TARGET_X86_64
>
>           case IDX_SEG_REGS + 8:
>
> +#ifdef TARGET_X86_64
>
>               if (env->hflags & HF_CS64_MASK) {
>
>                   env->kernelgsbase = ldq_p(mem_buf);
>
>                   return 8;
>
>               }
>
>               env->kernelgsbase = ldl_p(mem_buf);

You can add here the

#endif

>               return 4;

and remove the '#else return 4; #endif' lines.

> +#else
>
> +            return 4;
>
> #endif
>
>           case IDX_FP_REGS + 8:
>
> --
>
> 2.21.0

Regards,

Phil.