a85da649b9
Summary: This patch contains the implementation of the unwinder for IBM AIX. AIX does not support the eh_frame section. Instead, the traceback table located at the end of each function provides the information for stack unwinding and EH. In this patch macro _LIBUNWIND_SUPPORT_TBTAB_UNWIND is used to guard code for AIX traceback table based unwinding. Function getInfoFromTBTable() and stepWithTBTable() are added to get the EH information from the traceback table and to step up the stack respectively. There are two kinds of LSDA information for EH on AIX, the state table and the range table. The state table is used by the previous version of the IBM XL compiler, i.e., xlC and xlclang++. The DWARF based range table is used by AIX clang++. The traceback table has flags to differentiate these cases. For the range table, relative addresses are calculated using a base of DW_EH_PE_datarel, which is the TOC base of the module where the function of the current frame belongs. Two personality routines are employed to handle these two different LSDAs, __xlcxx_personality_v0() for the state table and __xlcxx_personality_v1() for the range table. Since the traceback table does not have the information of the personality for the state table approach, its personality __xlcxx_personality_v0() is dynamically resolved as the handler for the state table. For the range table, the locations of the LSDA and its associated personality routine are found in the traceback table. Assembly code for 32- and 64-bit PowerPC in UnwindRegistersRestore.S and UnwindRegistersSave.S are modified so that it can be consumed by the GNU flavor assembler and the AIX assembler. The restoration of vector registers does not check VRSAVE on AIX because VRSAVE is not used in the AIX ABI. Reviewed by: MaskRay, compnerd, cebowleratibm, sfertile, libunwind Differential Revision: https://reviews.llvm.org/D100132
73 lines
2.4 KiB
C
73 lines
2.4 KiB
C
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//
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// Extensions to libunwind API.
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//
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//===----------------------------------------------------------------------===//
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#ifndef __LIBUNWIND_EXT__
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#define __LIBUNWIND_EXT__
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#include "config.h"
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#include <libunwind.h>
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#include <unwind.h>
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#define UNW_STEP_SUCCESS 1
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#define UNW_STEP_END 0
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#ifdef __cplusplus
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extern "C" {
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#endif
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extern int __unw_getcontext(unw_context_t *);
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extern int __unw_init_local(unw_cursor_t *, unw_context_t *);
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extern int __unw_step(unw_cursor_t *);
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extern int __unw_get_reg(unw_cursor_t *, unw_regnum_t, unw_word_t *);
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extern int __unw_get_fpreg(unw_cursor_t *, unw_regnum_t, unw_fpreg_t *);
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extern int __unw_set_reg(unw_cursor_t *, unw_regnum_t, unw_word_t);
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extern int __unw_set_fpreg(unw_cursor_t *, unw_regnum_t, unw_fpreg_t);
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extern int __unw_resume(unw_cursor_t *);
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#ifdef __arm__
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/* Save VFP registers in FSTMX format (instead of FSTMD). */
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extern void __unw_save_vfp_as_X(unw_cursor_t *);
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#endif
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extern const char *__unw_regname(unw_cursor_t *, unw_regnum_t);
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extern int __unw_get_proc_info(unw_cursor_t *, unw_proc_info_t *);
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extern int __unw_is_fpreg(unw_cursor_t *, unw_regnum_t);
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extern int __unw_is_signal_frame(unw_cursor_t *);
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extern int __unw_get_proc_name(unw_cursor_t *, char *, size_t, unw_word_t *);
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#if defined(_AIX)
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extern uintptr_t __unw_get_data_rel_base(unw_cursor_t *);
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#endif
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// SPI
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extern void __unw_iterate_dwarf_unwind_cache(void (*func)(
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unw_word_t ip_start, unw_word_t ip_end, unw_word_t fde, unw_word_t mh));
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// IPI
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extern void __unw_add_dynamic_fde(unw_word_t fde);
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extern void __unw_remove_dynamic_fde(unw_word_t fde);
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extern void __unw_add_dynamic_eh_frame_section(unw_word_t eh_frame_start);
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extern void __unw_remove_dynamic_eh_frame_section(unw_word_t eh_frame_start);
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#if defined(_LIBUNWIND_ARM_EHABI)
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extern const uint32_t* decode_eht_entry(const uint32_t*, size_t*, size_t*);
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extern _Unwind_Reason_Code _Unwind_VRS_Interpret(_Unwind_Context *context,
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const uint32_t *data,
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size_t offset, size_t len);
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif // __LIBUNWIND_EXT__
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