[RFC PATCH 7/9] hurd: Generalize init-first.c to support x86_64

[Sergey Bugaev]

Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
---
 sysdeps/mach/hurd/{i386 => x86}/init-first.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)
 rename sysdeps/mach/hurd/{i386 => x86}/init-first.c (96%)

diff --git a/sysdeps/mach/hurd/i386/init-first.c 
b/sysdeps/mach/hurd/x86/init-first.c
similarity index 96%
rename from sysdeps/mach/hurd/i386/init-first.c
rename to sysdeps/mach/hurd/x86/init-first.c
index a558da16..75ac1ff2 100644
--- a/sysdeps/mach/hurd/i386/init-first.c
+++ b/sysdeps/mach/hurd/x86/init-first.c
@@ -227,10 +227,15 @@ init (int *data)
    values we set just above.  We have stashed in %eax the user code
    return address.  Push it on the top of the stack so it acts as
    init1's return address, and then jump there.  */
+#ifdef __x86_64__
+asm ("call_init1:\n"
+     "  push %rax\n"
+     "  jmp *%rcx\n");
+#else
 asm ("call_init1:\n"
      " push %eax\n"
      " jmp *%ecx\n");
-
+#endif
 
 /* Do the first essential initializations that must precede all else.  */
 static inline void
@@ -242,7 +247,7 @@ first_init (void)
 #ifndef SHARED
   /* In the static case, we need to set up TLS early so that the stack
      protection guard can be read at gs:0x14 by the gcc-generated snippets.  */
-  _hurd_tls_init(&__init1_tcbhead);
+  _hurd_tls_init (&__init1_tcbhead);
   asm ("movw %%gs,%w0" : "=m" (__init1_desc));
 #endif
 
@@ -300,7 +305,7 @@ _hurd_stack_setup (void)
        {
          /* If we use ``__builtin_frame_address (0) + 2'' here, GCC gets
             confused.  */
-         init ((int *) &argc);
+         init (&argc);
        }
 
       /* Push the user return address after the argument data, and then
@@ -308,9 +313,15 @@ _hurd_stack_setup (void)
         caller had called `doinit1' with the argument data already on the
         stack.  */
       *--data = caller;
+# ifdef __x86_64__
+      asm volatile ("movq %0, %%rsp\n" /* Switch to new outermost stack.  */
+                    "movq $0, %%rbp\n" /* Clear outermost frame pointer.  */
+                    "jmp *%1" : : "r" (data), "r" (&doinit1));
+# else
       asm volatile ("movl %0, %%esp\n" /* Switch to new outermost stack.  */
                    "movl $0, %%ebp\n" /* Clear outermost frame pointer.  */
                    "jmp *%1" : : "r" (data), "r" (&doinit1));
+# endif
       /* NOTREACHED */
     }
 
-- 
2.39.2