#undef WINT_TYPE_SIZE
#define WINT_TYPE_SIZE 16
-/* Dwarf2 unwind info is supported. */
+/* Dwarf2 unwind info is supported, unless overriden by a request for a target
+ specific format.
+
+ Taking care of this here allows using DWARF2_UNWIND_INFO in #if conditions
+ from the common config/vxworks.h files, included before the cpu
+ specializations. Unlike with conditions used in C expressions, where the
+ definitions which matter are those at the expression expansion point, use
+ in #if constructs requires an accurate definition of the operands at the
+ #if point. Since <cpu>/vxworks.h. is typically included after
+ config/vxworks.h, #if expressions in the latter can't rely on possible
+ redefinitions in the former. */
+#if !ARM_UNWIND_INFO
#undef DWARF2_UNWIND_INFO
#define DWARF2_UNWIND_INFO 1
+#endif
/* VxWorks uses DWARF2 debugging info. */
#define DWARF2_DEBUGGING_INFO 1
/* We occasionally need to distinguish between the VxWorks variants. */
#define VXWORKS_KIND_NORMAL 1
#define VXWORKS_KIND_AE 2
-
-/*
- * libitm is not supported on VxWorks. Rather than providing stub
- * no-op _ITM_registerTMCloneTable/_ITM_deregisterTMCloneTable
- * functions, simply prevent crtstuff from even referring to those.
- */
-#define USE_TM_CLONE_REGISTRY 0
--- /dev/null
+/* This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC 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 General Public License
+for more details.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+<http://www.gnu.org/licenses/>. */
+
+/* The essential point of the crtbegin/crtend files on VxWorks is to handle
+ the eh frames registration thanks to dedicated constructors and
+ destructors. What needs to be done depends on the VxWorks version and the
+ kind of module (rtp, dkm, ...) one is building. */
+
+#define IN_LIBGCC2
+
+#include "auto-host.h"
+#include "tconfig.h"
+#include "tsystem.h"
+#include "coretypes.h"
+#include "tm.h"
+#include "libgcc_tm.h"
+#include "unwind-dw2-fde.h"
+
+/* If we are entitled/requested to use init/fini arrays, we'll rely on that.
+ Otherwise, we may rely on ctors/dtors sections for RTPs or expect munch to
+ be involved for kernel modules. */
+
+#if !defined(USE_INIT_FINI_ARRAY) && defined(__RTP__)
+#define USE_CDTORS_SECTIONS
+#endif
+
+/* ------------------------------ crtbegin ------------------------------- */
+
+#ifdef CRT_BEGIN
+
+/* Stick a label at the beginning of the frame unwind info so we can register
+ and deregister it with the exception handling library code. */
+static const char __EH_FRAME_BEGIN__[]
+__attribute__((section(__LIBGCC_EH_FRAME_SECTION_NAME__), aligned(4)))
+ = { };
+
+/* Determine what names to use for the constructor/destructor functions. */
+
+#if defined(USE_CDTORS_SECTIONS) || defined(USE_INITFINI_ARRAY)
+
+#define EH_CTOR_NAME _crtbe_register_frame
+#define EH_DTOR_NAME _ctrbe_deregister_frame
+
+#else
+
+/* No specific sections for constructors or destructors: we thus use a
+ symbol naming convention so that the constructors are then recognized
+ by munch or whatever tool is used for the final link phase. */
+#define EH_CTOR_NAME _GLOBAL__I_00101_0__crtbe_register_frame
+#define EH_DTOR_NAME _GLOBAL__D_00101_1__crtbe_deregister_frame
+
+#endif
+
+#ifdef USE_INITFINI_ARRAY
+/* .init_array and .fini_array is supported starting VxWorks 7.2 in all
+ cases. The compiler is then configured to always support priorities in
+ constructors, so we can rely on the constructor and destructor attributes
+ to generate the proper sections. */
+#define EH_CTOR_ATTRIBUTE __attribute__((constructor (101)))
+#define EH_DTOR_ATTRIBUTE __attribute__((destructor (101)))
+
+#else /* USE_INITFINI_ARRAY */
+
+/* Note: Even in case of .ctors/.dtors sections, we can't use the attribute
+ (constructor (15)) here as gcc may have been configured with constructors
+ priority disabled. We will instead craft an explicit section name for this
+ purpose. */
+#define EH_CTOR_ATTRIBUTE
+#define EH_DTOR_ATTRIBUTE
+
+#endif /* USE_INITFINI_ARRAY */
+
+void EH_CTOR_NAME (void);
+void EH_DTOR_NAME (void);
+
+EH_CTOR_ATTRIBUTE void EH_CTOR_NAME (void)
+{
+ static struct object object;
+ __register_frame_info (__EH_FRAME_BEGIN__, &object);
+}
+
+EH_DTOR_ATTRIBUTE void EH_DTOR_NAME (void)
+{
+ __deregister_frame_info (__EH_FRAME_BEGIN__);
+}
+
+#ifdef USE_CDTORS_SECTIONS
+/* As explained above, we need to manually build the sections here as the
+ compiler may not have support for constructors priority enabled. */
+static void (* volatile eh_registration_ctors[])()
+ __attribute__((section (".ctors.101")))
+= { &EH_CTOR_NAME };
+static void (* volatile eh_registration_dtors[])()
+ __attribute__((section (".dtors.65434")))
+= { &EH_DTOR_NAME };
+#endif
+
+/* ------------------------------ crtend --------------------------------- */
+
+#elif defined (CRT_END) /* ! CRT_BEGIN */
+
+/* Terminate the frame unwind info section with a 4byte 0 as a sentinel;
+ this would be the 'length' field in a real FDE. */
+
+static const char __FRAME_END__[]
+ __attribute__ ((used, section(__LIBGCC_EH_FRAME_SECTION_NAME__),
+ aligned(4)))
+ = { 0, 0, 0, 0 };
+
+#else /* ! CRT_BEGIN & ! CRT_END */
+
+#error "One of CRT_BEGIN or CRT_END must be defined."
+
+#endif
projects / gcc.git / commitdiff