[PULL 0/2] Linux user for 6.1 patches

[PULL 0/2] Linux user for 6.1 patches

[Laurent Vivier]

The following changes since commit bccabb3a5d60182645c7749e89f21a9ff307a9eb:

  Update version for v6.1.0-rc2 release (2021-08-04 16:56:14 +0100)

are available in the Git repository at:

  git://github.com/vivier/qemu.git tags/linux-user-for-6.1-pull-request

for you to fetch changes up to 030912e01c0385b6b09e76549c1a8a04b624f49a:

  linux-user/elfload: byteswap i386 registers when dumping core (2021-08-05 12:17:30 +0200)

----------------------------------------------------------------
linux-user pull request 20210806

Fix endianness and addresses in i386 linux-user target

----------------------------------------------------------------

Ilya Leoshkevich (2):
  linux-user: fix guest/host address mixup in i386 setup_rt_frame()
  linux-user/elfload: byteswap i386 registers when dumping core

 linux-user/elfload.c     | 88 ++++++++++++++++++++--------------------
 linux-user/i386/signal.c |  8 ++--
 2 files changed, 48 insertions(+), 48 deletions(-)

-- 
2.31.1

[PULL 1/2] linux-user: fix guest/host address mixup in i386 setup_rt_frame()

[Laurent Vivier]

From: Ilya Leoshkevich <iii@linux.ibm.com>

setup_rt_frame() passes siginfo and ucontext host addresses to guest
signal handlers, causing problems when e.g. emulating x86_64 on s390x.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20210803171858.148394-1-iii@linux.ibm.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
---
 linux-user/i386/signal.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/linux-user/i386/signal.c b/linux-user/i386/signal.c
index 8701774e3791..841cd1965100 100644
--- a/linux-user/i386/signal.c
+++ b/linux-user/i386/signal.c
@@ -436,13 +436,13 @@ void setup_rt_frame(int sig, struct target_sigaction *ka,
 
 #ifndef TARGET_X86_64
     env->regs[R_EAX] = sig;
-    env->regs[R_EDX] = (unsigned long)&frame->info;
-    env->regs[R_ECX] = (unsigned long)&frame->uc;
+    env->regs[R_EDX] = frame_addr + offsetof(struct rt_sigframe, info);
+    env->regs[R_ECX] = frame_addr + offsetof(struct rt_sigframe, uc);
 #else
     env->regs[R_EAX] = 0;
     env->regs[R_EDI] = sig;
-    env->regs[R_ESI] = (unsigned long)&frame->info;
-    env->regs[R_EDX] = (unsigned long)&frame->uc;
+    env->regs[R_ESI] = frame_addr + offsetof(struct rt_sigframe, info);
+    env->regs[R_EDX] = frame_addr + offsetof(struct rt_sigframe, uc);
 #endif
 
     cpu_x86_load_seg(env, R_DS, __USER_DS);
-- 
2.31.1

[PULL 2/2] linux-user/elfload: byteswap i386 registers when dumping core

[Laurent Vivier]

From: Ilya Leoshkevich <iii@linux.ibm.com>

Core dumps from emulating x86_64 on big-endian hosts contain incorrect
register values.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20210803172013.148446-1-iii@linux.ibm.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
---
 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 42ef2a114855..01e9a833fbb6 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

Re: [PULL 0/2] Linux user for 6.1 patches

[Peter Maydell]

On Fri, 6 Aug 2021 at 10:18, Laurent Vivier <laurent@vivier.eu> wrote:
>
> The following changes since commit bccabb3a5d60182645c7749e89f21a9ff307a9eb:
>
>   Update version for v6.1.0-rc2 release (2021-08-04 16:56:14 +0100)
>
> are available in the Git repository at:
>
>   git://github.com/vivier/qemu.git tags/linux-user-for-6.1-pull-request
>
> for you to fetch changes up to 030912e01c0385b6b09e76549c1a8a04b624f49a:
>
>   linux-user/elfload: byteswap i386 registers when dumping core (2021-08-05 12:17:30 +0200)
>
> ----------------------------------------------------------------
> linux-user pull request 20210806
>
> Fix endianness and addresses in i386 linux-user target
>


Applied, thanks.

Please update the changelog at https://wiki.qemu.org/ChangeLog/6.1
for any user-visible changes.

-- PMM