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authorIgnacy Gawędzki <ignacy.gawedzki@green-communications.fr>2016-10-06 20:15:58 +0200
committerWaldemar Brodkorb <wbx@openadk.org>2016-11-29 08:39:15 +0100
commit43a336e63f16c639e0e6fefdd7404509159c07b1 (patch)
tree926cd30d04e72d76ed3b0d23084a71eeb9c13fac /libpthread/nptl/sysdeps/arm/arm-unwind-resume.c
parentb433e2d9fccb17f9a2807403c339a7004e3d4f1b (diff)
libpthread: Fix inclusion of unwind code.
Since librt and libpthread are now integrated into libc, including unwind-resume and unwind-forcedunwind implementations of unwind code makes no sense. Only unwind-forcedunwind is now included with functions hidden to avoid them overriding the ones from libgcc_s. * libpthread/nptl/sysdeps/generic/unwind-resume.h: New. Define generic PERSONALITY_PROTO and PERSONALITY_ARGS and set HAVE_ARCH_UNWIND_RESUME to 0. * libpthread/nptl/sysdeps/pthread/unwind-resume.c: Move... * libpthread/nptl/sysdeps/generic/unwind-resume.c: ... here. Include generic implementation of _Unwind_Resume on the condition that !HAVE_ARCH_UNWIND_RESUME. Make functions hidden to prevent them from overriding libgcc_s's ones. * libpthread/nptl/sysdeps/pthread/unwind-forcedunwind.c: Likewise. * libpthread/nptl/sysdeps/arm/unwind-resume.h: New. Define ARM-specific PERSONALITY_PROTO and PERSONALITY_ARGS and set HAVE_ARCH_UNWIND_RESUME to 1. * libpthread/nptl/sysdeps/arm/arm-unwind-resume.c, * libpthread/nptl/sysdeps/arm/pt-arm-unwind-resume.c, * libpthread/nptl/sysdeps/arm/rt-arm-unwind-resume.c: New. ARM-specific implementations of _Unwind_Resume resp. for libc, libpthread and librt. * libpthread/nptl/sysdeps/Makefile.commonarch: Remove both arm-unwind-resume and rt-arm-unwind-resume from libpthread_arch_CSRC. * libpthread/nptl/sysdeps/unix/sysv/linux/arm/unwind-forcedunwind.c, * libpthread/nptl/sysdeps/unix/sysv/linux/arm/unwind-resume.c: Remove. Signed-off-by: Ignacy Gawędzki <ignacy.gawedzki@green-communications.fr>
Diffstat (limited to 'libpthread/nptl/sysdeps/arm/arm-unwind-resume.c')
-rw-r--r--libpthread/nptl/sysdeps/arm/arm-unwind-resume.c67
1 files changed, 67 insertions, 0 deletions
diff --git a/libpthread/nptl/sysdeps/arm/arm-unwind-resume.c b/libpthread/nptl/sysdeps/arm/arm-unwind-resume.c
new file mode 100644
index 000000000..ae55582ee
--- /dev/null
+++ b/libpthread/nptl/sysdeps/arm/arm-unwind-resume.c
@@ -0,0 +1,67 @@
+/* Copyright (C) 2003, 2005, 2010 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, see <http://www.gnu.org/licenses/>. */
+
+/* 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. */
+
+#include <sysdep.h>
+
+__asm__ (
+" .globl _Unwind_Resume\n"
+" .hidden _Unwind_Resume\n"
+" .type _Unwind_Resume, %function\n"
+"_Unwind_Resume:\n"
+" " CFI_SECTIONS (.debug_frame) "\n"
+" " CFI_STARTPROC "\n"
+" stmfd sp!, {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"
+" ldmfd sp!, {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 __libgcc_s_init\n"
+" ldr r3, [r4, r5]\n"
+" b 5b\n"
+" " CFI_ENDPROC "\n"
+" .align 2\n"
+#ifdef __thumb2__
+"1: .word _GLOBAL_OFFSET_TABLE_ - 3b - 4\n"
+#else
+"1: .word _GLOBAL_OFFSET_TABLE_ - 3b - 8\n"
+#endif
+"2: .word __libgcc_s_resume(GOTOFF)\n"
+" .size _Unwind_Resume, .-_Unwind_Resume\n"
+);