[glibc] hurd: Implement _hurd_longjmp_thread_state for x86_64

[glibc] hurd: Implement _hurd_longjmp_thread_state for x86_64

[Samuel Thibault]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=20427b8f231edfa786cbf2672f8d00199ea7c6c6

commit 20427b8f231edfa786cbf2672f8d00199ea7c6c6
Author: Sergey Bugaev <bugaevc@gmail.com>
Date:   Sun Mar 19 18:10:11 2023 +0300

    hurd: Implement _hurd_longjmp_thread_state for x86_64
    
    Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
    Message-Id: <20230319151017.531737-29-bugaevc@gmail.com>

Diff:
---
 sysdeps/mach/hurd/x86_64/longjmp-ts.c | 41 +++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/sysdeps/mach/hurd/x86_64/longjmp-ts.c b/sysdeps/mach/hurd/x86_64/longjmp-ts.c
new file mode 100644
index 0000000000..2c57d26aab
--- /dev/null
+++ b/sysdeps/mach/hurd/x86_64/longjmp-ts.c
@@ -0,0 +1,41 @@
+/* Perform a `longjmp' on a Mach thread_state.  x86_64 version.
+   Copyright (C) 1991-2023 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <hurd/signal.h>
+#include <setjmp.h>
+#include <jmpbuf-offsets.h>
+#include <mach/thread_status.h>
+
+
+/* Set up STATE to do the equivalent of `longjmp (ENV, VAL);'.  */
+
+void
+_hurd_longjmp_thread_state (void *state, jmp_buf env, int val)
+{
+  struct i386_thread_state *ts = state;
+
+  ts->rbx = env[0].__jmpbuf[JB_RBX];
+  ts->rbp = env[0].__jmpbuf[JB_RBP];
+  ts->r12 = env[0].__jmpbuf[JB_R12];
+  ts->r13 = env[0].__jmpbuf[JB_R13];
+  ts->r14 = env[0].__jmpbuf[JB_R14];
+  ts->r15 = env[0].__jmpbuf[JB_R15];
+  ts->ursp = env[0].__jmpbuf[JB_RSP];
+  ts->rip = env[0].__jmpbuf[JB_PC];
+  ts->rax = val ?: 1;
+}