2a1ee410ce
* defaults.h (ASM_PREFERRED_EH_DATA_FORMAT): New. * dwarf2asm.c (dw2_force_const_mem, dw2_output_indirect_constant_1, dw2_output_indirect_constants, dw2_asm_output_encoded_addr_rtx): New. * dwarf2asm.h (dw2_asm_output_encoded_addr_rtx): Prototype. (dw2_output_indirect_constants): Prototype. * dwarf2out.c (dwarf2out_begin_prologue): Generate current_function_func_begin_label if we'll need it for EH. Exit early for IA64_UNWIND_INFO. * except.c: Get DW_EH_PE_* defines from dwarf2.h. (eh_data_format_name): Update for indirect references. (output_function_exception_table): Care for IA64_UNWIND_INFO. Handle ASM_PREFERRED_EH_DATA_FORMAT. * except.h (MUST_USE_SJLJ_EXCEPTIONS): IA64_UNWIND_INFO needn't define HAVE_eh_return etc. * final.c (final_start_function): Always call dwarf2out_begin_prologue. (final_end_function): Don't call output_function_exception_table. * toplev.c (compile_file): Call dw2_output_indirect_constants. (rest_of_compilation): Invoke output_function_exception_table for ia64 before assemble_end_function. * tm.texi (ASM_PREFERRED_EH_DATA_FORMAT): Document. (ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX): Document. * unwind-dw2.c (_Unwind_GetTextRelBase, _Unwind_GetDataRelBase): New. * unwind.h: Declare them. * libgcc-std.ver: Export them. * unwind-pe.h: New file. * config/alpha/elf.h (ASM_PREFERRED_EH_DATA_FORMAT): New. * config/ia64/fde-glibc.c: Use "struct unw_table_entry" instead of "fde". (find_fde_for_dso): Extract DT_PLTGOT. (_Unwind_FindTableEntry): Rename from __ia64_find_fde; return the segment and gp as well. * config/ia64/frame-ia64.c: Remove file. * config/ia64/frame-ia64.h: Remove file. * config/ia64/unwind-ia64.c: New file. * config/ia64/unwind-ia64.h: New file. * config/ia64/ia64.h (ASM_OUTPUT_EH_CHAR): Remove. (ASM_OUTPUT_EH_SHORT, ASM_OUTPUT_EH_INT): Remove. (ASM_OUTPUT_EH_DOUBLE_INT): Remove. (ASM_PREFERRED_EH_DATA_FORMAT): New. (ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX): New. (IA64_UNWIND_INFO): Re-enable. (HANDLER_SECTION): Remove. (EH_RETURN_DATA_REGNO): New. * config/ia64/ia64.md (exception_receiver): Remove. * config/ia64/t-glibc (LIB2ADDEH): Re-enable. * config/ia64/t-ia64 (LIB2ADDEH): Re-enable. From-SVN: r41981
192 lines
7.0 KiB
C
192 lines
7.0 KiB
C
/* Exception handling and frame unwind runtime interface routines.
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Copyright (C) 2001 Free Software Foundation, Inc.
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* This is derived from the C++ ABI for IA-64. Where we diverge
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for cross-architecture compatibility are noted with "@@@". */
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Level 1: Base ABI */
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/* @@@ The IA-64 ABI uses uint64 throughout. Most places this is
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inefficient for 32-bit and smaller machines. */
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typedef unsigned _Unwind_Word __attribute__((__mode__(__word__)));
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typedef signed _Unwind_Sword __attribute__((__mode__(__word__)));
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typedef unsigned _Unwind_Ptr __attribute__((__mode__(__pointer__)));
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/* @@@ The IA-64 ABI uses a 64-bit word to identify the producer and
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consumer of an exception. We'll go along with this for now even on
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32-bit machines. We'll need to provide some other option for
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16-bit machines and for machines with > 8 bits per byte. */
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typedef unsigned _Unwind_Exception_Class __attribute__((__mode__(__DI__)));
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/* The unwind interface uses reason codes in several contexts to
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identify the reasons for failures or other actions. */
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typedef enum
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{
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_URC_NO_REASON = 0,
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_URC_FOREIGN_EXCEPTION_CAUGHT = 1,
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_URC_FATAL_PHASE2_ERROR = 2,
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_URC_FATAL_PHASE1_ERROR = 3,
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_URC_NORMAL_STOP = 4,
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_URC_END_OF_STACK = 5,
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_URC_HANDLER_FOUND = 6,
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_URC_INSTALL_CONTEXT = 7,
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_URC_CONTINUE_UNWIND = 8
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} _Unwind_Reason_Code;
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/* The unwind interface uses a pointer to an exception header object
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as its representation of an exception being thrown. In general, the
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full representation of an exception object is language- and
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implementation-specific, but it will be prefixed by a header
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understood by the unwind interface. */
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struct _Unwind_Exception;
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typedef void (*_Unwind_Exception_Cleanup_Fn) (_Unwind_Reason_Code,
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struct _Unwind_Exception *);
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struct _Unwind_Exception
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{
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_Unwind_Exception_Class exception_class;
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_Unwind_Exception_Cleanup_Fn exception_cleanup;
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_Unwind_Word private_1;
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_Unwind_Word private_2;
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/* @@@ The IA-64 ABI says that this structure must be double-word aligned.
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Taking that literally does not make much sense generically. Instead we
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provide the maximum alignment required by any type for the machine. */
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} __attribute__((__aligned__));
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/* The ACTIONS argument to the personality routine is a bitwise OR of one
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or more of the following constants. */
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typedef int _Unwind_Action;
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#define _UA_SEARCH_PHASE 1
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#define _UA_CLEANUP_PHASE 2
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#define _UA_HANDLER_FRAME 4
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#define _UA_FORCE_UNWIND 8
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/* This is an opaque type used to refer to a system-specific data
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structure used by the system unwinder. This context is created and
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destroyed by the system, and passed to the personality routine
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during unwinding. */
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struct _Unwind_Context;
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/* Raise an exception, passing along the given exception object. */
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extern _Unwind_Reason_Code _Unwind_RaiseException (struct _Unwind_Exception *);
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/* Raise an exception for forced unwinding. */
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typedef _Unwind_Reason_Code (*_Unwind_Stop_Fn)
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(int, _Unwind_Action, _Unwind_Exception_Class,
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struct _Unwind_Exception *, struct _Unwind_Context *, void *);
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extern _Unwind_Reason_Code _Unwind_ForcedUnwind (struct _Unwind_Exception *,
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_Unwind_Stop_Fn,
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void *);
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/* Helper to invoke the exception_cleanup routine. */
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extern void _Unwind_DeleteException (struct _Unwind_Exception *);
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/* Resume propagation of an existing exception. This is used after
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e.g. executing cleanup code, and not to implement rethrowing. */
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extern void _Unwind_Resume (struct _Unwind_Exception *);
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/* These functions are used for communicating information about the unwind
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context (i.e. the unwind descriptors and the user register state) between
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the unwind library and the personality routine and landing pad. Only
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selected registers maybe manipulated. */
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extern _Unwind_Word _Unwind_GetGR (struct _Unwind_Context *, int);
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extern void _Unwind_SetGR (struct _Unwind_Context *, int, _Unwind_Word);
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extern _Unwind_Ptr _Unwind_GetIP (struct _Unwind_Context *);
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extern void _Unwind_SetIP (struct _Unwind_Context *, _Unwind_Ptr);
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extern void *_Unwind_GetLanguageSpecificData (struct _Unwind_Context *);
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extern _Unwind_Ptr _Unwind_GetRegionStart (struct _Unwind_Context *);
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/* The personality routine is the function in the C++ (or other language)
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runtime library which serves as an interface between the system unwind
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library and language-specific exception handling semantics. It is
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specific to the code fragment described by an unwind info block, and
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it is always referenced via the pointer in the unwind info block, and
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hence it has no ABI-specified name.
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Note that this implies that two different C++ implementations can
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use different names, and have different contents in the language
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specific data area. Moreover, that the language specific data
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area contains no version info because name of the function invoked
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provides more effective versioning by detecting at link time the
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lack of code to handle the different data format. */
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typedef _Unwind_Reason_Code (*_Unwind_Personality_Fn)
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(int, _Unwind_Action, _Unwind_Exception_Class,
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struct _Unwind_Exception *, struct _Unwind_Context *);
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/* @@@ The following alternate entry points are for setjmp/longjmp
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based unwinding. */
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struct SjLj_Function_Context;
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extern void _Unwind_SjLj_Register (struct SjLj_Function_Context *);
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extern void _Unwind_SjLj_Unregister (struct SjLj_Function_Context *);
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extern _Unwind_Reason_Code _Unwind_SjLj_RaiseException
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(struct _Unwind_Exception *);
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extern _Unwind_Reason_Code _Unwind_SjLj_ForcedUnwind
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(struct _Unwind_Exception *, _Unwind_Stop_Fn, void *);
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extern void _Unwind_SjLj_Resume (struct _Unwind_Exception *);
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/* @@@ The following provide access to the base addresses for text
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and data-relative addressing in the LDSA. In order to stay link
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compatible with the standard ABI for IA-64, we inline these. */
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#ifdef __ia64__
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#include <stdlib.h>
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static inline _Unwind_Ptr
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_Unwind_GetDataRelBase (struct _Unwind_Context *_C)
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{
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/* The GP is stored in R1. */
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return _Unwind_GetGR (_C, 1);
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}
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static inline _Unwind_Ptr
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_Unwind_GetTextRelBase (struct _Unwind_Context *_C)
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{
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abort ();
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return 0;
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}
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#else
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extern _Unwind_Ptr _Unwind_GetDataRelBase (struct _Unwind_Context *);
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extern _Unwind_Ptr _Unwind_GetTextRelBase (struct _Unwind_Context *);
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#endif
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#ifdef __cplusplus
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}
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#endif
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