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sigsegv: Add tentative support for Hurd/x86_64.

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Reported by Samuel Thibault <samuel.thibault@ens-lyon.org>.

* lib/sigsegv.c: Update from libsigsegv/src/fault-hurd-i386.h.
This commit is contained in:
Bruno Haible
2023-05-12 21:28:47 +02:00
parent f01d879277
commit acb36717d8
2 changed files with 23 additions and 3 deletions
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ChangeLog
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@@ -1,3 +1,9 @@
2023-05-12 Bruno Haible <bruno@clisp.org>
sigsegv: Add tentative support for Hurd/x86_64.
Reported by Samuel Thibault <samuel.thibault@ens-lyon.org>.
* lib/sigsegv.c: Update from libsigsegv/src/fault-hurd-i386.h.
2023-05-12 Paul Eggert <eggert@cs.ucla.edu>
file-has-acl: port to Fedora 39

20
lib/sigsegv.c
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@@ -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". */