1 files changed, 129 insertions, 0 deletions
diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/arm/unwind-forcedunwind.c b/libpthread/nptl/sysdeps/unix/sysv/linux/arm/unwind-forcedunwind.c
new file mode 100644
index 000000000..206202809
--- /dev/null
+++ b/libpthread/nptl/sysdeps/unix/sysv/linux/arm/unwind-forcedunwind.c
@@ -0,0 +1,129 @@
+/* Copyright (C) 2003, 2005 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Jakub Jelinek <jakub@redhat.com>.
+
+   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; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <dlfcn.h>
+#include <string.h>
+#include <unwind.h>
+#include <unistd.h>
+#include <pthreadP.h>
+
+#define __libc_dlopen(x)	dlopen(x, (RTLD_LOCAL | RTLD_LAZY))
+#define __libc_dlsym		dlsym
+
+static void (*libgcc_s_resume) (struct _Unwind_Exception *exc);
+static _Unwind_Reason_Code (*libgcc_s_personality)
+  (_Unwind_State, struct _Unwind_Exception *, struct _Unwind_Context *);
+static _Unwind_Reason_Code (*libgcc_s_forcedunwind)
+  (struct _Unwind_Exception *, _Unwind_Stop_Fn, void *);
+static _Unwind_Word (*libgcc_s_getcfa) (struct _Unwind_Context *);
+
+void
+pthread_cancel_init (void)
+{
+  void *resume, *personality, *forcedunwind, *getcfa;
+  void *handle;
+
+  if (__builtin_expect (libgcc_s_getcfa != NULL, 1))
+    return;
+
+  handle = __libc_dlopen ("libgcc_s.so.1");
+
+  if (handle == NULL
+      || (resume = __libc_dlsym (handle, "_Unwind_Resume")) == NULL
+      || (personality = __libc_dlsym (handle, "__gcc_personality_v0")) == NULL
+      || (forcedunwind = __libc_dlsym (handle, "_Unwind_ForcedUnwind"))
+	 == NULL
+      || (getcfa = __libc_dlsym (handle, "_Unwind_GetCFA")) == NULL
+#ifdef ARCH_CANCEL_INIT
+      || ARCH_CANCEL_INIT (handle)
+#endif
+      )
+    {
+# define STR_N_LEN(str) str, strlen (str)
+      INTERNAL_SYSCALL_DECL (err);
+      INTERNAL_SYSCALL (write, err, 3, STDERR_FILENO,
+			STR_N_LEN ("libgcc_s.so.1 must be installed for pthread_cancel to work\n"));
+      abort ();
+    }
+
+  libgcc_s_resume = resume;
+  libgcc_s_personality = personality;
+  libgcc_s_forcedunwind = forcedunwind;
+  libgcc_s_getcfa = getcfa;
+}
+
+/* It's vitally important that _Unwind_Resume not have a stack frame; the
+   ARM unwinder relies on register state at entrance.  So we write this in
+   assembly.  */
+
+asm (
+#ifdef __thumb__
+"	.code 32"
+#endif
+"	.globl	_Unwind_Resume\n"
+"	.type	_Unwind_Resume, %function\n"
+"_Unwind_Resume:\n"
+"	stmfd	sp!, {r4, r5, r6, lr}\n"
+"	ldr	r4, 1f\n"
+"	ldr	r5, 2f\n"
+"3:	add	r4, pc, r4\n"
+"	ldr	r3, [r4, r5]\n"
+"	mov	r6, r0\n"
+"	cmp	r3, #0\n"
+"	beq	4f\n"
+"5:	mov	r0, r6\n"
+"	ldmfd	sp!, {r4, r5, r6, lr}\n"
+"	bx	r3\n"
+"4:	bl	pthread_cancel_init\n"
+"	ldr	r3, [r4, r5]\n"
+"	b	5b\n"
+"1:	.word	_GLOBAL_OFFSET_TABLE_ - 3b - 8\n"
+"2:	.word	libgcc_s_resume(GOTOFF)\n"
+"	.size	_Unwind_Resume, .-_Unwind_Resume\n"
+#ifdef __thumb__
+"	.code 16"
+#endif
+);
+
+_Unwind_Reason_Code
+__gcc_personality_v0 (_Unwind_State state,
+		      struct _Unwind_Exception *ue_header,
+		      struct _Unwind_Context *context)
+{
+  if (__builtin_expect (libgcc_s_personality == NULL, 0))
+    pthread_cancel_init ();
+  return libgcc_s_personality (state, ue_header, context);
+}
+
+_Unwind_Reason_Code
+_Unwind_ForcedUnwind (struct _Unwind_Exception *exc, _Unwind_Stop_Fn stop,
+		      void *stop_argument)
+{
+  if (__builtin_expect (libgcc_s_forcedunwind == NULL, 0))
+    pthread_cancel_init ();
+  return libgcc_s_forcedunwind (exc, stop, stop_argument);
+}
+
+_Unwind_Word
+_Unwind_GetCFA (struct _Unwind_Context *context)
+{
+  if (__builtin_expect (libgcc_s_getcfa == NULL, 0))
+    pthread_cancel_init ();
+  return libgcc_s_getcfa (context);
+}