1 files changed, 100 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/arm/unwind-resume.c b/sysdeps/unix/sysv/linux/arm/unwind-resume.c
new file mode 100644
index 0000000000..bff3e2b4f1
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/arm/unwind-resume.c
@@ -0,0 +1,100 @@
+/* Copyright (C) 2003-2014 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.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <dlfcn.h>
+#include <stdio.h>
+#include <unwind.h>
+
+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 void init (void) __attribute_used__;
+
+static void
+init (void)
+{
+  void *resume, *personality;
+  void *handle;
+
+  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)
+    __libc_fatal ("libgcc_s.so.1 must be installed for pthread_cancel to work\n");
+
+  libgcc_s_resume = resume;
+  libgcc_s_personality = personality;
+}
+
+/* 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.  */
+
+#define STR1(S) #S
+#define STR(S)  STR1(S)
+
+asm (
+"	.globl	_Unwind_Resume\n"
+"	.type	_Unwind_Resume, %function\n"
+"_Unwind_Resume:\n"
+"	.cfi_sections .debug_frame\n"
+"	" CFI_STARTPROC "\n"
+"	push	{r4, r5, r6, lr}\n"
+"	" CFI_ADJUST_CFA_OFFSET (16)" \n"
+"	" CFI_REL_OFFSET (r4, 0) "\n"
+"	" CFI_REL_OFFSET (r5, 4) "\n"
+"	" CFI_REL_OFFSET (r6, 8) "\n"
+"	" CFI_REL_OFFSET (lr, 12) "\n"
+"	" CFI_REMEMBER_STATE "\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"
+"	pop	{r4, r5, r6, lr}\n"
+"	" CFI_ADJUST_CFA_OFFSET (-16) "\n"
+"	" CFI_RESTORE (r4) "\n"
+"	" CFI_RESTORE (r5) "\n"
+"	" CFI_RESTORE (r6) "\n"
+"	" CFI_RESTORE (lr) "\n"
+"	bx	r3\n"
+"	" CFI_RESTORE_STATE "\n"
+"4:	bl	init\n"
+"	ldr	r3, [r4, r5]\n"
+"	b	5b\n"
+"	" CFI_ENDPROC "\n"
+"	.align 2\n"
+"1:	.word	_GLOBAL_OFFSET_TABLE_ - 3b - " STR (PC_OFS) "\n"
+"2:	.word	libgcc_s_resume(GOTOFF)\n"
+"	.size	_Unwind_Resume, .-_Unwind_Resume\n"
+);
+
+_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))
+    init ();
+  return libgcc_s_personality (state, ue_header, context);
+}