[glibc] hurd: Fix setting up signal thread stack alignment

[Samuel Thibault <sthibaul@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=9ffdcf5b79acacffc35506812ca8d99ea1dde618

commit 9ffdcf5b79acacffc35506812ca8d99ea1dde618
Author: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date:   Sun May 28 00:29:14 2023 +0200

    hurd: Fix setting up signal thread stack alignment
    
    x86_64 needs special alignment when calling functions, so we have to use
    MACHINE_THREAD_STATE_SETUP_CALL for the signal thread when forking.

Diff:
---
 sysdeps/mach/hurd/_Fork.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/sysdeps/mach/hurd/_Fork.c b/sysdeps/mach/hurd/_Fork.c
index 77cd29171e..9981699a5a 100644
--- a/sysdeps/mach/hurd/_Fork.c
+++ b/sysdeps/mach/hurd/_Fork.c
@@ -481,13 +481,11 @@ retry:
 				    MACHINE_THREAD_STATE_FLAVOR,
 				    (natural_t *) &state, &statecount))
 	LOSE;
-#ifdef STACK_GROWTH_UP
-      state.SP = __hurd_sigthread_stack_base;
-#else
-      state.SP = __hurd_sigthread_stack_end;
-#endif
-      MACHINE_THREAD_STATE_SET_PC (&state,
-				   (unsigned long int) _hurd_msgport_receive);
+
+      MACHINE_THREAD_STATE_SETUP_CALL(&state,
+	  __hurd_sigthread_stack_base,
+	  __hurd_sigthread_stack_end - __hurd_sigthread_stack_base,
+	  (uintptr_t) _hurd_msgport_receive);
 
       /* Do special signal thread setup for TLS if needed.  */
       if (err = _hurd_tls_fork (sigthread, _hurd_msgport_thread, &state))