* [PATCH] linux-user/elfload: byteswap i386 registers when dumping core
@ 2021-08-03 17:20 Ilya Leoshkevich
2021-08-03 18:34 ` Peter Maydell
` (2 more replies)
0 siblings, 3 replies; 6+ messages in thread
From: Ilya Leoshkevich @ 2021-08-03 17:20 UTC (permalink / raw)
To: Laurent Vivier
Cc: Christian Borntraeger, qemu-devel, Ilya Leoshkevich, Andreas Krebbel
Core dumps from emulating x86_64 on big-endian hosts contain incorrect
register values.
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
linux-user/elfload.c | 88 ++++++++++++++++++++++----------------------
1 file changed, 44 insertions(+), 44 deletions(-)
diff --git a/linux-user/elfload.c b/linux-user/elfload.c
index 42ef2a1148..01e9a833fb 100644
--- a/linux-user/elfload.c
+++ b/linux-user/elfload.c
@@ -172,33 +172,33 @@ typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
*/
static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUX86State *env)
{
- (*regs)[0] = env->regs[15];
- (*regs)[1] = env->regs[14];
- (*regs)[2] = env->regs[13];
- (*regs)[3] = env->regs[12];
- (*regs)[4] = env->regs[R_EBP];
- (*regs)[5] = env->regs[R_EBX];
- (*regs)[6] = env->regs[11];
- (*regs)[7] = env->regs[10];
- (*regs)[8] = env->regs[9];
- (*regs)[9] = env->regs[8];
- (*regs)[10] = env->regs[R_EAX];
- (*regs)[11] = env->regs[R_ECX];
- (*regs)[12] = env->regs[R_EDX];
- (*regs)[13] = env->regs[R_ESI];
- (*regs)[14] = env->regs[R_EDI];
- (*regs)[15] = env->regs[R_EAX]; /* XXX */
- (*regs)[16] = env->eip;
- (*regs)[17] = env->segs[R_CS].selector & 0xffff;
- (*regs)[18] = env->eflags;
- (*regs)[19] = env->regs[R_ESP];
- (*regs)[20] = env->segs[R_SS].selector & 0xffff;
- (*regs)[21] = env->segs[R_FS].selector & 0xffff;
- (*regs)[22] = env->segs[R_GS].selector & 0xffff;
- (*regs)[23] = env->segs[R_DS].selector & 0xffff;
- (*regs)[24] = env->segs[R_ES].selector & 0xffff;
- (*regs)[25] = env->segs[R_FS].selector & 0xffff;
- (*regs)[26] = env->segs[R_GS].selector & 0xffff;
+ (*regs)[0] = tswapreg(env->regs[15]);
+ (*regs)[1] = tswapreg(env->regs[14]);
+ (*regs)[2] = tswapreg(env->regs[13]);
+ (*regs)[3] = tswapreg(env->regs[12]);
+ (*regs)[4] = tswapreg(env->regs[R_EBP]);
+ (*regs)[5] = tswapreg(env->regs[R_EBX]);
+ (*regs)[6] = tswapreg(env->regs[11]);
+ (*regs)[7] = tswapreg(env->regs[10]);
+ (*regs)[8] = tswapreg(env->regs[9]);
+ (*regs)[9] = tswapreg(env->regs[8]);
+ (*regs)[10] = tswapreg(env->regs[R_EAX]);
+ (*regs)[11] = tswapreg(env->regs[R_ECX]);
+ (*regs)[12] = tswapreg(env->regs[R_EDX]);
+ (*regs)[13] = tswapreg(env->regs[R_ESI]);
+ (*regs)[14] = tswapreg(env->regs[R_EDI]);
+ (*regs)[15] = tswapreg(env->regs[R_EAX]); /* XXX */
+ (*regs)[16] = tswapreg(env->eip);
+ (*regs)[17] = tswapreg(env->segs[R_CS].selector & 0xffff);
+ (*regs)[18] = tswapreg(env->eflags);
+ (*regs)[19] = tswapreg(env->regs[R_ESP]);
+ (*regs)[20] = tswapreg(env->segs[R_SS].selector & 0xffff);
+ (*regs)[21] = tswapreg(env->segs[R_FS].selector & 0xffff);
+ (*regs)[22] = tswapreg(env->segs[R_GS].selector & 0xffff);
+ (*regs)[23] = tswapreg(env->segs[R_DS].selector & 0xffff);
+ (*regs)[24] = tswapreg(env->segs[R_ES].selector & 0xffff);
+ (*regs)[25] = tswapreg(env->segs[R_FS].selector & 0xffff);
+ (*regs)[26] = tswapreg(env->segs[R_GS].selector & 0xffff);
}
#else
@@ -244,23 +244,23 @@ typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
*/
static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUX86State *env)
{
- (*regs)[0] = env->regs[R_EBX];
- (*regs)[1] = env->regs[R_ECX];
- (*regs)[2] = env->regs[R_EDX];
- (*regs)[3] = env->regs[R_ESI];
- (*regs)[4] = env->regs[R_EDI];
- (*regs)[5] = env->regs[R_EBP];
- (*regs)[6] = env->regs[R_EAX];
- (*regs)[7] = env->segs[R_DS].selector & 0xffff;
- (*regs)[8] = env->segs[R_ES].selector & 0xffff;
- (*regs)[9] = env->segs[R_FS].selector & 0xffff;
- (*regs)[10] = env->segs[R_GS].selector & 0xffff;
- (*regs)[11] = env->regs[R_EAX]; /* XXX */
- (*regs)[12] = env->eip;
- (*regs)[13] = env->segs[R_CS].selector & 0xffff;
- (*regs)[14] = env->eflags;
- (*regs)[15] = env->regs[R_ESP];
- (*regs)[16] = env->segs[R_SS].selector & 0xffff;
+ (*regs)[0] = tswapreg(env->regs[R_EBX]);
+ (*regs)[1] = tswapreg(env->regs[R_ECX]);
+ (*regs)[2] = tswapreg(env->regs[R_EDX]);
+ (*regs)[3] = tswapreg(env->regs[R_ESI]);
+ (*regs)[4] = tswapreg(env->regs[R_EDI]);
+ (*regs)[5] = tswapreg(env->regs[R_EBP]);
+ (*regs)[6] = tswapreg(env->regs[R_EAX]);
+ (*regs)[7] = tswapreg(env->segs[R_DS].selector & 0xffff);
+ (*regs)[8] = tswapreg(env->segs[R_ES].selector & 0xffff);
+ (*regs)[9] = tswapreg(env->segs[R_FS].selector & 0xffff);
+ (*regs)[10] = tswapreg(env->segs[R_GS].selector & 0xffff);
+ (*regs)[11] = tswapreg(env->regs[R_EAX]); /* XXX */
+ (*regs)[12] = tswapreg(env->eip);
+ (*regs)[13] = tswapreg(env->segs[R_CS].selector & 0xffff);
+ (*regs)[14] = tswapreg(env->eflags);
+ (*regs)[15] = tswapreg(env->regs[R_ESP]);
+ (*regs)[16] = tswapreg(env->segs[R_SS].selector & 0xffff);
}
#endif
--
2.31.1
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH] linux-user/elfload: byteswap i386 registers when dumping core
2021-08-03 17:20 [PATCH] linux-user/elfload: byteswap i386 registers when dumping core Ilya Leoshkevich
@ 2021-08-03 18:34 ` Peter Maydell
2021-08-04 14:12 ` Laurent Vivier
2021-08-04 9:49 ` Philippe Mathieu-Daudé
2021-08-05 10:17 ` Laurent Vivier
2 siblings, 1 reply; 6+ messages in thread
From: Peter Maydell @ 2021-08-03 18:34 UTC (permalink / raw)
To: Ilya Leoshkevich
Cc: Christian Borntraeger, Andreas Krebbel, Laurent Vivier, QEMU Developers
On Tue, 3 Aug 2021 at 18:21, Ilya Leoshkevich <iii@linux.ibm.com> wrote:
>
> Core dumps from emulating x86_64 on big-endian hosts contain incorrect
> register values.
>
> Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Looks like these two were the only two guest arch versions of this
function that were missing the tswapreg calls...
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
thanks
-- PMM
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] linux-user/elfload: byteswap i386 registers when dumping core
2021-08-03 17:20 [PATCH] linux-user/elfload: byteswap i386 registers when dumping core Ilya Leoshkevich
2021-08-03 18:34 ` Peter Maydell
@ 2021-08-04 9:49 ` Philippe Mathieu-Daudé
2021-08-05 10:17 ` Laurent Vivier
2 siblings, 0 replies; 6+ messages in thread
From: Philippe Mathieu-Daudé @ 2021-08-04 9:49 UTC (permalink / raw)
To: Ilya Leoshkevich, Laurent Vivier
Cc: Christian Borntraeger, qemu-devel, Andreas Krebbel
On 8/3/21 7:20 PM, Ilya Leoshkevich wrote:
> Core dumps from emulating x86_64 on big-endian hosts contain incorrect
> register values.
>
> Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
> ---
> linux-user/elfload.c | 88 ++++++++++++++++++++++----------------------
> 1 file changed, 44 insertions(+), 44 deletions(-)
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] linux-user/elfload: byteswap i386 registers when dumping core
2021-08-03 18:34 ` Peter Maydell
@ 2021-08-04 14:12 ` Laurent Vivier
2021-08-04 14:55 ` Philippe Mathieu-Daudé
0 siblings, 1 reply; 6+ messages in thread
From: Laurent Vivier @ 2021-08-04 14:12 UTC (permalink / raw)
To: Peter Maydell
Cc: Christian Borntraeger, QEMU Developers, Ilya Leoshkevich,
Andreas Krebbel
Le 03/08/2021 à 20:34, Peter Maydell a écrit :
> On Tue, 3 Aug 2021 at 18:21, Ilya Leoshkevich <iii@linux.ibm.com> wrote:
>>
>> Core dumps from emulating x86_64 on big-endian hosts contain incorrect
>> register values.
>>
>> Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
>
>
> Looks like these two were the only two guest arch versions of this
> function that were missing the tswapreg calls...
>
> Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Do we want this in 6.1?
Thanks,
Laurent
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] linux-user/elfload: byteswap i386 registers when dumping core
2021-08-04 14:12 ` Laurent Vivier
@ 2021-08-04 14:55 ` Philippe Mathieu-Daudé
0 siblings, 0 replies; 6+ messages in thread
From: Philippe Mathieu-Daudé @ 2021-08-04 14:55 UTC (permalink / raw)
To: Laurent Vivier, Peter Maydell
Cc: Christian Borntraeger, Andreas Krebbel, QEMU Developers,
Ilya Leoshkevich
On 8/4/21 4:12 PM, Laurent Vivier wrote:
> Le 03/08/2021 à 20:34, Peter Maydell a écrit :
>> On Tue, 3 Aug 2021 at 18:21, Ilya Leoshkevich <iii@linux.ibm.com> wrote:
>>>
>>> Core dumps from emulating x86_64 on big-endian hosts contain incorrect
>>> register values.
>>>
>>> Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
>>
>>
>> Looks like these two were the only two guest arch versions of this
>> function that were missing the tswapreg calls...
>>
>> Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
>
> Do we want this in 6.1?
Safe enough, I'd rather see it in, since there are recent interest in
emulating x86 binaries on s390x... My 2 cents ;)
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] linux-user/elfload: byteswap i386 registers when dumping core
2021-08-03 17:20 [PATCH] linux-user/elfload: byteswap i386 registers when dumping core Ilya Leoshkevich
2021-08-03 18:34 ` Peter Maydell
2021-08-04 9:49 ` Philippe Mathieu-Daudé
@ 2021-08-05 10:17 ` Laurent Vivier
2 siblings, 0 replies; 6+ messages in thread
From: Laurent Vivier @ 2021-08-05 10:17 UTC (permalink / raw)
To: Ilya Leoshkevich; +Cc: Christian Borntraeger, qemu-devel, Andreas Krebbel
Le 03/08/2021 à 19:20, Ilya Leoshkevich a écrit :
> Core dumps from emulating x86_64 on big-endian hosts contain incorrect
> register values.
>
> Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
> ---
> linux-user/elfload.c | 88 ++++++++++++++++++++++----------------------
> 1 file changed, 44 insertions(+), 44 deletions(-)
>
> diff --git a/linux-user/elfload.c b/linux-user/elfload.c
> index 42ef2a1148..01e9a833fb 100644
> --- a/linux-user/elfload.c
> +++ b/linux-user/elfload.c
> @@ -172,33 +172,33 @@ typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
> */
> static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUX86State *env)
> {
> - (*regs)[0] = env->regs[15];
> - (*regs)[1] = env->regs[14];
> - (*regs)[2] = env->regs[13];
> - (*regs)[3] = env->regs[12];
> - (*regs)[4] = env->regs[R_EBP];
> - (*regs)[5] = env->regs[R_EBX];
> - (*regs)[6] = env->regs[11];
> - (*regs)[7] = env->regs[10];
> - (*regs)[8] = env->regs[9];
> - (*regs)[9] = env->regs[8];
> - (*regs)[10] = env->regs[R_EAX];
> - (*regs)[11] = env->regs[R_ECX];
> - (*regs)[12] = env->regs[R_EDX];
> - (*regs)[13] = env->regs[R_ESI];
> - (*regs)[14] = env->regs[R_EDI];
> - (*regs)[15] = env->regs[R_EAX]; /* XXX */
> - (*regs)[16] = env->eip;
> - (*regs)[17] = env->segs[R_CS].selector & 0xffff;
> - (*regs)[18] = env->eflags;
> - (*regs)[19] = env->regs[R_ESP];
> - (*regs)[20] = env->segs[R_SS].selector & 0xffff;
> - (*regs)[21] = env->segs[R_FS].selector & 0xffff;
> - (*regs)[22] = env->segs[R_GS].selector & 0xffff;
> - (*regs)[23] = env->segs[R_DS].selector & 0xffff;
> - (*regs)[24] = env->segs[R_ES].selector & 0xffff;
> - (*regs)[25] = env->segs[R_FS].selector & 0xffff;
> - (*regs)[26] = env->segs[R_GS].selector & 0xffff;
> + (*regs)[0] = tswapreg(env->regs[15]);
> + (*regs)[1] = tswapreg(env->regs[14]);
> + (*regs)[2] = tswapreg(env->regs[13]);
> + (*regs)[3] = tswapreg(env->regs[12]);
> + (*regs)[4] = tswapreg(env->regs[R_EBP]);
> + (*regs)[5] = tswapreg(env->regs[R_EBX]);
> + (*regs)[6] = tswapreg(env->regs[11]);
> + (*regs)[7] = tswapreg(env->regs[10]);
> + (*regs)[8] = tswapreg(env->regs[9]);
> + (*regs)[9] = tswapreg(env->regs[8]);
> + (*regs)[10] = tswapreg(env->regs[R_EAX]);
> + (*regs)[11] = tswapreg(env->regs[R_ECX]);
> + (*regs)[12] = tswapreg(env->regs[R_EDX]);
> + (*regs)[13] = tswapreg(env->regs[R_ESI]);
> + (*regs)[14] = tswapreg(env->regs[R_EDI]);
> + (*regs)[15] = tswapreg(env->regs[R_EAX]); /* XXX */
> + (*regs)[16] = tswapreg(env->eip);
> + (*regs)[17] = tswapreg(env->segs[R_CS].selector & 0xffff);
> + (*regs)[18] = tswapreg(env->eflags);
> + (*regs)[19] = tswapreg(env->regs[R_ESP]);
> + (*regs)[20] = tswapreg(env->segs[R_SS].selector & 0xffff);
> + (*regs)[21] = tswapreg(env->segs[R_FS].selector & 0xffff);
> + (*regs)[22] = tswapreg(env->segs[R_GS].selector & 0xffff);
> + (*regs)[23] = tswapreg(env->segs[R_DS].selector & 0xffff);
> + (*regs)[24] = tswapreg(env->segs[R_ES].selector & 0xffff);
> + (*regs)[25] = tswapreg(env->segs[R_FS].selector & 0xffff);
> + (*regs)[26] = tswapreg(env->segs[R_GS].selector & 0xffff);
> }
>
> #else
> @@ -244,23 +244,23 @@ typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
> */
> static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUX86State *env)
> {
> - (*regs)[0] = env->regs[R_EBX];
> - (*regs)[1] = env->regs[R_ECX];
> - (*regs)[2] = env->regs[R_EDX];
> - (*regs)[3] = env->regs[R_ESI];
> - (*regs)[4] = env->regs[R_EDI];
> - (*regs)[5] = env->regs[R_EBP];
> - (*regs)[6] = env->regs[R_EAX];
> - (*regs)[7] = env->segs[R_DS].selector & 0xffff;
> - (*regs)[8] = env->segs[R_ES].selector & 0xffff;
> - (*regs)[9] = env->segs[R_FS].selector & 0xffff;
> - (*regs)[10] = env->segs[R_GS].selector & 0xffff;
> - (*regs)[11] = env->regs[R_EAX]; /* XXX */
> - (*regs)[12] = env->eip;
> - (*regs)[13] = env->segs[R_CS].selector & 0xffff;
> - (*regs)[14] = env->eflags;
> - (*regs)[15] = env->regs[R_ESP];
> - (*regs)[16] = env->segs[R_SS].selector & 0xffff;
> + (*regs)[0] = tswapreg(env->regs[R_EBX]);
> + (*regs)[1] = tswapreg(env->regs[R_ECX]);
> + (*regs)[2] = tswapreg(env->regs[R_EDX]);
> + (*regs)[3] = tswapreg(env->regs[R_ESI]);
> + (*regs)[4] = tswapreg(env->regs[R_EDI]);
> + (*regs)[5] = tswapreg(env->regs[R_EBP]);
> + (*regs)[6] = tswapreg(env->regs[R_EAX]);
> + (*regs)[7] = tswapreg(env->segs[R_DS].selector & 0xffff);
> + (*regs)[8] = tswapreg(env->segs[R_ES].selector & 0xffff);
> + (*regs)[9] = tswapreg(env->segs[R_FS].selector & 0xffff);
> + (*regs)[10] = tswapreg(env->segs[R_GS].selector & 0xffff);
> + (*regs)[11] = tswapreg(env->regs[R_EAX]); /* XXX */
> + (*regs)[12] = tswapreg(env->eip);
> + (*regs)[13] = tswapreg(env->segs[R_CS].selector & 0xffff);
> + (*regs)[14] = tswapreg(env->eflags);
> + (*regs)[15] = tswapreg(env->regs[R_ESP]);
> + (*regs)[16] = tswapreg(env->segs[R_SS].selector & 0xffff);
> }
> #endif
>
>
Applied to my linux-user-for-6.1 branch.
Thanks,
Laurent
^ permalink raw reply [flat|nested] 6+ messages in thread
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2021-08-03 17:20 [PATCH] linux-user/elfload: byteswap i386 registers when dumping core Ilya Leoshkevich
2021-08-03 18:34 ` Peter Maydell
2021-08-04 14:12 ` Laurent Vivier
2021-08-04 14:55 ` Philippe Mathieu-Daudé
2021-08-04 9:49 ` Philippe Mathieu-Daudé
2021-08-05 10:17 ` Laurent Vivier
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