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Subject: bug#63333: [PATCH] Add hurd-amd64 support
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This adds SIGSEGV_FAULT_STACKPOINTER for the hurd-amd64 case
--- ./lib/sigsegv.c.original 2023-05-05 10:45:54.673751100 +0000
+++ ./lib/sigsegv.c 2023-05-05 10:48:47.903577554 +0000
@@ -351,6 +351,17 @@
"old esp, if trapped from user". */
# define SIGSEGV_FAULT_STACKPOINTER scp->sc_uesp
+# elif defined __x86_64__
+
+/* scp points to a 'struct sigcontext' (defined in
+ glibc/sysdeps/mach/hurd/x86_64/bits/sigcontext.h).
+ The registers of this struct get pushed on the stack through
+ gnumach/x86_64/i386/locore.S:trapall. */
+/* Both sc_rsp and sc_ursp appear to have the same value.
+ It appears more reliable to use sc_ursp because it is labelled as
+ "old rsp, if trapped from user". */
+# define SIGSEGV_FAULT_STACKPOINTER scp->sc_ursp
+
# endif
#endif
Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: Samuel Thibault <samuel.thibault@HIDDEN> Subject: bug#63333: Acknowledgement ([PATCH] Add hurd-amd64 support) Message-ID: <handler.63333.B.168339802714202.ack <at> debbugs.gnu.org> References: <20230506142237.xozdh3rhulbtj7xn@begin> X-Gnu-PR-Message: ack 63333 X-Gnu-PR-Package: diffutils X-Gnu-PR-Keywords: patch Reply-To: 63333 <at> debbugs.gnu.org Date: Sat, 06 May 2023 18:34:02 +0000 Thank you for filing a new bug report with debbugs.gnu.org. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): bug-diffutils@HIDDEN If you wish to submit further information on this problem, please send it to 63333 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 63333: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D63333 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
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Subject: bug#63333: [bug-diffutils] bug#63333: [PATCH] Add hurd-amd64 support
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On Sat, May 6, 2023 at 8:34=E2=80=AFPM Samuel Thibault
<samuel.thibault@HIDDEN> wrote:
> This adds SIGSEGV_FAULT_STACKPOINTER for the hurd-amd64 case
>
> --- ./lib/sigsegv.c.original 2023-05-05 10:45:54.673751100 +0000
> +++ ./lib/sigsegv.c 2023-05-05 10:48:47.903577554 +0000
> @@ -351,6 +351,17 @@
> "old esp, if trapped from user". */
> # define SIGSEGV_FAULT_STACKPOINTER scp->sc_uesp
>
> +# elif defined __x86_64__
> +
> +/* scp points to a 'struct sigcontext' (defined in
> + glibc/sysdeps/mach/hurd/x86_64/bits/sigcontext.h).
> + The registers of this struct get pushed on the stack through
> + gnumach/x86_64/i386/locore.S:trapall. */
> +/* Both sc_rsp and sc_ursp appear to have the same value.
> + It appears more reliable to use sc_ursp because it is labelled as
> + "old rsp, if trapped from user". */
> +# define SIGSEGV_FAULT_STACKPOINTER scp->sc_ursp
> +
> # endif
>
> #endif
Hi Samuel, thanks. This belongs in gnulib, so cc'ing that list.
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Subject: bug#63333: [bug-diffutils] bug#63333: [PATCH] Add hurd-amd64 support
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On Sat, May 6, 2023 at 8:34=E2=80=AFPM Samuel Thibault
<samuel.thibault@HIDDEN> wrote:
> This adds SIGSEGV_FAULT_STACKPOINTER for the hurd-amd64 case
>
> --- ./lib/sigsegv.c.original 2023-05-05 10:45:54.673751100 +0000
> +++ ./lib/sigsegv.c 2023-05-05 10:48:47.903577554 +0000
> @@ -351,6 +351,17 @@
> "old esp, if trapped from user". */
> # define SIGSEGV_FAULT_STACKPOINTER scp->sc_uesp
>
> +# elif defined __x86_64__
> +
> +/* scp points to a 'struct sigcontext' (defined in
> + glibc/sysdeps/mach/hurd/x86_64/bits/sigcontext.h).
> + The registers of this struct get pushed on the stack through
> + gnumach/x86_64/i386/locore.S:trapall. */
> +/* Both sc_rsp and sc_ursp appear to have the same value.
> + It appears more reliable to use sc_ursp because it is labelled as
> + "old rsp, if trapped from user". */
> +# define SIGSEGV_FAULT_STACKPOINTER scp->sc_ursp
> +
> # endif
>
> #endif
Hi Samuel, thanks. This belongs in gnulib, so cc'ing that list.
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From: Bruno Haible <bruno@HIDDEN>
Date: Fri, 12 May 2023 21:38:29 +0200
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Samuel Thibault <samuel.thibault@HIDDEN> wrote:
> > This adds SIGSEGV_FAULT_STACKPOINTER for the hurd-amd64 case
> >
> > --- ./lib/sigsegv.c.original 2023-05-05 10:45:54.673751100 +0000
> > +++ ./lib/sigsegv.c 2023-05-05 10:48:47.903577554 +0000
> > @@ -351,6 +351,17 @@
> > "old esp, if trapped from user". */
> > # define SIGSEGV_FAULT_STACKPOINTER scp->sc_uesp
> >
> > +# elif defined __x86_64__
> > +
> > +/* scp points to a 'struct sigcontext' (defined in
> > + glibc/sysdeps/mach/hurd/x86_64/bits/sigcontext.h).
> > + The registers of this struct get pushed on the stack through
> > + gnumach/x86_64/i386/locore.S:trapall. */
> > +/* Both sc_rsp and sc_ursp appear to have the same value.
> > + It appears more reliable to use sc_ursp because it is labelled as
> > + "old rsp, if trapped from user". */
> > +# define SIGSEGV_FAULT_STACKPOINTER scp->sc_ursp
> > +
> > # endif
> >
> > #endif
Thanks Samuel. The definition of SIGSEGV_FAULT_STACKPOINTER seems correct in
this patch, but the comments are not. I am applying this instead.
I'm calling this "tentative" support for Hurd/x86_64, because
- I have no way to test it,
- some of the code paths involved seem to be incorrect so far, see
https://lists.gnu.org/archive/html/bug-hurd/2023-05/msg00207.html
2023-05-12 Bruno Haible <bruno@HIDDEN>
sigsegv: Add tentative support for Hurd/x86_64.
Reported by Samuel Thibault <samuel.thibault@HIDDEN>.
* lib/sigsegv.c: Update from libsigsegv/src/fault-hurd-i386.h.
diff --git a/lib/sigsegv.c b/lib/sigsegv.c
index 5e943e4d5d..aadba4e060 100644
--- a/lib/sigsegv.c
+++ b/lib/sigsegv.c
@@ -365,12 +365,26 @@ int libsigsegv_version = LIBSIGSEGV_VERSION;
# define SIGSEGV_FAULT_ADDRESS (unsigned long) code
# define SIGSEGV_FAULT_CONTEXT scp
-# if defined __i386__
+# if defined __x86_64__
+/* 64 bit registers */
+
+/* scp points to a 'struct sigcontext' (defined in
+ glibc/sysdeps/mach/hurd/x86_64/bits/sigcontext.h).
+ The registers, at the moment the signal occurred, get pushed on the stack
+ through gnumach/x86_64/locore.S:alltraps and then copied into the struct
+ through glibc/sysdeps/mach/hurd/x86/trampoline.c. */
+/* sc_rsp is unused (not set by gnumach/x86_64/locore.S:alltraps). We need
+ to use sc_ursp. */
+# define SIGSEGV_FAULT_STACKPOINTER scp->sc_ursp
+
+# elif defined __i386__
+/* 32 bit registers */
/* scp points to a 'struct sigcontext' (defined in
glibc/sysdeps/mach/hurd/i386/bits/sigcontext.h).
- The registers of this struct get pushed on the stack through
- gnumach/i386/i386/locore.S:trapall. */
+ The registers, at the moment the signal occurred, get pushed on the stack
+ through gnumach/i386/i386/locore.S:alltraps and then copied into the struct
+ through glibc/sysdeps/mach/hurd/x86/trampoline.c. */
/* Both sc_esp and sc_uesp appear to have the same value.
It appears more reliable to use sc_uesp because it is labelled as
"old esp, if trapped from user". */
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Subject: bug#63333: [bug-diffutils] bug#63333: [PATCH] Add hurd-amd64 support
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From: Bruno Haible <bruno@HIDDEN>
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Samuel Thibault <samuel.thibault@HIDDEN> wrote:
> > This adds SIGSEGV_FAULT_STACKPOINTER for the hurd-amd64 case
> >
> > --- ./lib/sigsegv.c.original 2023-05-05 10:45:54.673751100 +0000
> > +++ ./lib/sigsegv.c 2023-05-05 10:48:47.903577554 +0000
> > @@ -351,6 +351,17 @@
> > "old esp, if trapped from user". */
> > # define SIGSEGV_FAULT_STACKPOINTER scp->sc_uesp
> >
> > +# elif defined __x86_64__
> > +
> > +/* scp points to a 'struct sigcontext' (defined in
> > + glibc/sysdeps/mach/hurd/x86_64/bits/sigcontext.h).
> > + The registers of this struct get pushed on the stack through
> > + gnumach/x86_64/i386/locore.S:trapall. */
> > +/* Both sc_rsp and sc_ursp appear to have the same value.
> > + It appears more reliable to use sc_ursp because it is labelled as
> > + "old rsp, if trapped from user". */
> > +# define SIGSEGV_FAULT_STACKPOINTER scp->sc_ursp
> > +
> > # endif
> >
> > #endif
Thanks Samuel. The definition of SIGSEGV_FAULT_STACKPOINTER seems correct in
this patch, but the comments are not. I am applying this instead.
I'm calling this "tentative" support for Hurd/x86_64, because
- I have no way to test it,
- some of the code paths involved seem to be incorrect so far, see
https://lists.gnu.org/archive/html/bug-hurd/2023-05/msg00207.html
2023-05-12 Bruno Haible <bruno@HIDDEN>
sigsegv: Add tentative support for Hurd/x86_64.
Reported by Samuel Thibault <samuel.thibault@HIDDEN>.
* lib/sigsegv.c: Update from libsigsegv/src/fault-hurd-i386.h.
diff --git a/lib/sigsegv.c b/lib/sigsegv.c
index 5e943e4d5d..aadba4e060 100644
--- a/lib/sigsegv.c
+++ b/lib/sigsegv.c
@@ -365,12 +365,26 @@ int libsigsegv_version = LIBSIGSEGV_VERSION;
# define SIGSEGV_FAULT_ADDRESS (unsigned long) code
# define SIGSEGV_FAULT_CONTEXT scp
-# if defined __i386__
+# if defined __x86_64__
+/* 64 bit registers */
+
+/* scp points to a 'struct sigcontext' (defined in
+ glibc/sysdeps/mach/hurd/x86_64/bits/sigcontext.h).
+ The registers, at the moment the signal occurred, get pushed on the stack
+ through gnumach/x86_64/locore.S:alltraps and then copied into the struct
+ through glibc/sysdeps/mach/hurd/x86/trampoline.c. */
+/* sc_rsp is unused (not set by gnumach/x86_64/locore.S:alltraps). We need
+ to use sc_ursp. */
+# define SIGSEGV_FAULT_STACKPOINTER scp->sc_ursp
+
+# elif defined __i386__
+/* 32 bit registers */
/* scp points to a 'struct sigcontext' (defined in
glibc/sysdeps/mach/hurd/i386/bits/sigcontext.h).
- The registers of this struct get pushed on the stack through
- gnumach/i386/i386/locore.S:trapall. */
+ The registers, at the moment the signal occurred, get pushed on the stack
+ through gnumach/i386/i386/locore.S:alltraps and then copied into the struct
+ through glibc/sysdeps/mach/hurd/x86/trampoline.c. */
/* Both sc_esp and sc_uesp appear to have the same value.
It appears more reliable to use sc_uesp because it is labelled as
"old esp, if trapped from user". */
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Subject: bug#63333: [bug-diffutils] bug#63333: [PATCH] Add hurd-amd64 support
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I committed:
> 2023-05-12 Bruno Haible <bruno@HIDDEN>
>
> sigsegv: Add tentative support for Hurd/x86_64.
> Reported by Samuel Thibault <samuel.thibault@HIDDEN>.
> * lib/sigsegv.c: Update from libsigsegv/src/fault-hurd-i386.h.
This was not sufficient. Sergey Bugaev pointed out that
- my comments were wrong,
- the handler's parameter list needs to include 'long code', not 'int code',
for x86_64.
This patch fixes it, in sync with libsigsegv.
2023-05-15 Bruno Haible <bruno@HIDDEN>
sigsegv: Add tentative support for Hurd/x86_64.
Based on explanations by Sergey Bugaev <bugaevc@HIDDEN>.
* lib/sigsegv.c: Update from libsigsegv/src/fault-hurd-i386-old.h.
diff --git a/lib/sigsegv.c b/lib/sigsegv.c
index aadba4e060..8263d9b7bd 100644
--- a/lib/sigsegv.c
+++ b/lib/sigsegv.c
@@ -361,7 +361,7 @@ int libsigsegv_version = LIBSIGSEGV_VERSION;
#if defined __GNU__ /* Hurd */
-# define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
+# define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, long code, struct sigcontext *scp
# define SIGSEGV_FAULT_ADDRESS (unsigned long) code
# define SIGSEGV_FAULT_CONTEXT scp
@@ -370,11 +370,29 @@ int libsigsegv_version = LIBSIGSEGV_VERSION;
/* scp points to a 'struct sigcontext' (defined in
glibc/sysdeps/mach/hurd/x86_64/bits/sigcontext.h).
- The registers, at the moment the signal occurred, get pushed on the stack
- through gnumach/x86_64/locore.S:alltraps and then copied into the struct
- through glibc/sysdeps/mach/hurd/x86/trampoline.c. */
-/* sc_rsp is unused (not set by gnumach/x86_64/locore.S:alltraps). We need
- to use sc_ursp. */
+ The registers, at the moment the signal occurred, get pushed on the kernel
+ stack through gnumach/x86_64/locore.S:alltraps. They are denoted by a
+ 'struct i386_saved_state' (defined in gnumach/i386/i386/thread.h).
+ Upon invocation of the Mach interface function thread_get_state
+ <https://www.gnu.org/software/hurd/gnumach-doc/Thread-Execution.html>
+ (= __thread_get_state in glibc), defined in gnumach/kern/thread.c,
+ the function thread_getstatus, defined in gnumach/i386/i386/pcb.c, copies the
+ register values in a different arrangement into a 'struct i386_thread_state',
+ defined in gnumach/i386/include/mach/i386/thread_status.h. (Different
+ arrangement: trapno, err get dropped; different order of r8...r15; also rsp
+ gets set to 0.)
+ This 'struct i386_thread_state' is actually the 'basic' part of a
+ 'struct machine_thread_all_state', defined in
+ glibc/sysdeps/mach/x86/thread_state.h.
+ From there, the function _hurd_setup_sighandler, defined in
+ glibc/sysdeps/mach/hurd/x86/trampoline.c,
+ 1. sets rsp to the same value as ursp,
+ 2. copies the 'struct i386_thread_state' into the appropriate part of a
+ 'struct sigcontext', defined in
+ glibc/sysdeps/mach/hurd/x86_64/bits/sigcontext.h. */
+/* Both sc_rsp and sc_ursp have the same value.
+ It appears more reliable to use sc_ursp because sc_rsp is marked as
+ "not used". */
# define SIGSEGV_FAULT_STACKPOINTER scp->sc_ursp
# elif defined __i386__
@@ -382,12 +400,28 @@ int libsigsegv_version = LIBSIGSEGV_VERSION;
/* scp points to a 'struct sigcontext' (defined in
glibc/sysdeps/mach/hurd/i386/bits/sigcontext.h).
- The registers, at the moment the signal occurred, get pushed on the stack
- through gnumach/i386/i386/locore.S:alltraps and then copied into the struct
- through glibc/sysdeps/mach/hurd/x86/trampoline.c. */
-/* Both sc_esp and sc_uesp appear to have the same value.
- It appears more reliable to use sc_uesp because it is labelled as
- "old esp, if trapped from user". */
+ The registers, at the moment the signal occurred, get pushed on the kernel
+ stack through gnumach/i386/i386/locore.S:alltraps. They are denoted by a
+ 'struct i386_saved_state' (defined in gnumach/i386/i386/thread.h).
+ Upon invocation of the Mach interface function thread_get_state
+ <https://www.gnu.org/software/hurd/gnumach-doc/Thread-Execution.html>
+ (= __thread_get_state in glibc), defined in gnumach/kern/thread.c,
+ the function thread_getstatus, defined in gnumach/i386/i386/pcb.c, copies the
+ register values in a different arrangement into a 'struct i386_thread_state',
+ defined in gnumach/i386/include/mach/i386/thread_status.h. (Different
+ arrangement: trapno, err get dropped; also esp gets set to 0.)
+ This 'struct i386_thread_state' is actually the 'basic' part of a
+ 'struct machine_thread_all_state', defined in
+ glibc/sysdeps/mach/x86/thread_state.h.
+ From there, the function _hurd_setup_sighandler, defined in
+ glibc/sysdeps/mach/hurd/x86/trampoline.c,
+ 1. sets esp to the same value as uesp,
+ 2. copies the 'struct i386_thread_state' into the appropriate part of a
+ 'struct sigcontext', defined in
+ glibc/sysdeps/mach/hurd/i386/bits/sigcontext.h. */
+/* Both sc_esp and sc_uesp have the same value.
+ It appears more reliable to use sc_uesp because sc_esp is marked as
+ "not used". */
# define SIGSEGV_FAULT_STACKPOINTER scp->sc_uesp
# endif
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Subject: bug#63333: [bug-diffutils] bug#63333: [PATCH] Add hurd-amd64 support
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I committed:
> 2023-05-12 Bruno Haible <bruno@HIDDEN>
>
> sigsegv: Add tentative support for Hurd/x86_64.
> Reported by Samuel Thibault <samuel.thibault@HIDDEN>.
> * lib/sigsegv.c: Update from libsigsegv/src/fault-hurd-i386.h.
This was not sufficient. Sergey Bugaev pointed out that
- my comments were wrong,
- the handler's parameter list needs to include 'long code', not 'int code',
for x86_64.
This patch fixes it, in sync with libsigsegv.
2023-05-15 Bruno Haible <bruno@HIDDEN>
sigsegv: Add tentative support for Hurd/x86_64.
Based on explanations by Sergey Bugaev <bugaevc@HIDDEN>.
* lib/sigsegv.c: Update from libsigsegv/src/fault-hurd-i386-old.h.
diff --git a/lib/sigsegv.c b/lib/sigsegv.c
index aadba4e060..8263d9b7bd 100644
--- a/lib/sigsegv.c
+++ b/lib/sigsegv.c
@@ -361,7 +361,7 @@ int libsigsegv_version = LIBSIGSEGV_VERSION;
#if defined __GNU__ /* Hurd */
-# define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
+# define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, long code, struct sigcontext *scp
# define SIGSEGV_FAULT_ADDRESS (unsigned long) code
# define SIGSEGV_FAULT_CONTEXT scp
@@ -370,11 +370,29 @@ int libsigsegv_version = LIBSIGSEGV_VERSION;
/* scp points to a 'struct sigcontext' (defined in
glibc/sysdeps/mach/hurd/x86_64/bits/sigcontext.h).
- The registers, at the moment the signal occurred, get pushed on the stack
- through gnumach/x86_64/locore.S:alltraps and then copied into the struct
- through glibc/sysdeps/mach/hurd/x86/trampoline.c. */
-/* sc_rsp is unused (not set by gnumach/x86_64/locore.S:alltraps). We need
- to use sc_ursp. */
+ The registers, at the moment the signal occurred, get pushed on the kernel
+ stack through gnumach/x86_64/locore.S:alltraps. They are denoted by a
+ 'struct i386_saved_state' (defined in gnumach/i386/i386/thread.h).
+ Upon invocation of the Mach interface function thread_get_state
+ <https://www.gnu.org/software/hurd/gnumach-doc/Thread-Execution.html>
+ (= __thread_get_state in glibc), defined in gnumach/kern/thread.c,
+ the function thread_getstatus, defined in gnumach/i386/i386/pcb.c, copies the
+ register values in a different arrangement into a 'struct i386_thread_state',
+ defined in gnumach/i386/include/mach/i386/thread_status.h. (Different
+ arrangement: trapno, err get dropped; different order of r8...r15; also rsp
+ gets set to 0.)
+ This 'struct i386_thread_state' is actually the 'basic' part of a
+ 'struct machine_thread_all_state', defined in
+ glibc/sysdeps/mach/x86/thread_state.h.
+ From there, the function _hurd_setup_sighandler, defined in
+ glibc/sysdeps/mach/hurd/x86/trampoline.c,
+ 1. sets rsp to the same value as ursp,
+ 2. copies the 'struct i386_thread_state' into the appropriate part of a
+ 'struct sigcontext', defined in
+ glibc/sysdeps/mach/hurd/x86_64/bits/sigcontext.h. */
+/* Both sc_rsp and sc_ursp have the same value.
+ It appears more reliable to use sc_ursp because sc_rsp is marked as
+ "not used". */
# define SIGSEGV_FAULT_STACKPOINTER scp->sc_ursp
# elif defined __i386__
@@ -382,12 +400,28 @@ int libsigsegv_version = LIBSIGSEGV_VERSION;
/* scp points to a 'struct sigcontext' (defined in
glibc/sysdeps/mach/hurd/i386/bits/sigcontext.h).
- The registers, at the moment the signal occurred, get pushed on the stack
- through gnumach/i386/i386/locore.S:alltraps and then copied into the struct
- through glibc/sysdeps/mach/hurd/x86/trampoline.c. */
-/* Both sc_esp and sc_uesp appear to have the same value.
- It appears more reliable to use sc_uesp because it is labelled as
- "old esp, if trapped from user". */
+ The registers, at the moment the signal occurred, get pushed on the kernel
+ stack through gnumach/i386/i386/locore.S:alltraps. They are denoted by a
+ 'struct i386_saved_state' (defined in gnumach/i386/i386/thread.h).
+ Upon invocation of the Mach interface function thread_get_state
+ <https://www.gnu.org/software/hurd/gnumach-doc/Thread-Execution.html>
+ (= __thread_get_state in glibc), defined in gnumach/kern/thread.c,
+ the function thread_getstatus, defined in gnumach/i386/i386/pcb.c, copies the
+ register values in a different arrangement into a 'struct i386_thread_state',
+ defined in gnumach/i386/include/mach/i386/thread_status.h. (Different
+ arrangement: trapno, err get dropped; also esp gets set to 0.)
+ This 'struct i386_thread_state' is actually the 'basic' part of a
+ 'struct machine_thread_all_state', defined in
+ glibc/sysdeps/mach/x86/thread_state.h.
+ From there, the function _hurd_setup_sighandler, defined in
+ glibc/sysdeps/mach/hurd/x86/trampoline.c,
+ 1. sets esp to the same value as uesp,
+ 2. copies the 'struct i386_thread_state' into the appropriate part of a
+ 'struct sigcontext', defined in
+ glibc/sysdeps/mach/hurd/i386/bits/sigcontext.h. */
+/* Both sc_esp and sc_uesp have the same value.
+ It appears more reliable to use sc_uesp because sc_esp is marked as
+ "not used". */
# define SIGSEGV_FAULT_STACKPOINTER scp->sc_uesp
# endif
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