811a475ea3
As the following testcase shows, unwind.h on ARM can't be (starting with GCC
10) compiled with -std=c* modes, only -std=gnu* modes.
The problem is it uses asm keyword, which isn't a keyword in those modes
(system headers vs. non-system ones don't make a difference here).
glibc and other installed headers use __asm or __asm__ keywords instead that
work fine in both standard and gnu modes.
While there, as it is an installed header, I think it is also wrong to
completely ignore any identifier namespace rules.
The generic unwind.h defines just _Unwind* namespace identifiers plus
_sleb128_t/_uleb128_t (but e.g. unlike libstdc++/glibc headers doesn't
uglify operand names), the ARM unwind.h is much worse here. I've just
changed the gnu_Unwind_Find_got function at least not be in user identifier
namespace, but perhaps it would be good to go further and rename e.g.
or e.g.
typedef _Unwind_Reason_Code (*personality_routine) (_Unwind_State,
_Unwind_Control_Block *, _Unwind_Context *);
in unwind-arm-common.h.
2020-02-07 Jakub Jelinek <jakub@redhat.com>
PR target/93615
* config/arm/unwind-arm.h (gnu_Unwind_Find_got): Rename to ...
(_Unwind_gnu_Find_got): ... this. Use __asm instead of asm. Remove
trailing :s in asm. Formatting fixes.
(_Unwind_decode_typeinfo_ptr): Adjust caller.
* gcc.dg/pr93615.c: New test.
119 lines
3.8 KiB
C
119 lines
3.8 KiB
C
/* Header file for the ARM EABI unwinder
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Copyright (C) 2003-2020 Free Software Foundation, Inc.
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Contributed by Paul Brook
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This file is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 3, or (at your option) any
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later version.
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This file is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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/* Language-independent unwinder header public defines. This contains both
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ABI defined objects, and GNU support routines. */
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#ifndef UNWIND_ARM_H
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#define UNWIND_ARM_H
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#include "unwind-arm-common.h"
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#define UNWIND_STACK_REG 13
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/* Use IP as a scratch register within the personality routine. */
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#define UNWIND_POINTER_REG 12
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#define FDPIC_REGNUM 9
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#define STR(x) #x
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#define XSTR(x) STR(x)
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#ifdef __cplusplus
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extern "C" {
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#endif
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_Unwind_Ptr __attribute__((weak)) __gnu_Unwind_Find_got (_Unwind_Ptr);
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static inline _Unwind_Ptr _Unwind_gnu_Find_got (_Unwind_Ptr ptr)
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{
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_Unwind_Ptr res;
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if (__gnu_Unwind_Find_got)
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res = __gnu_Unwind_Find_got (ptr);
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else
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__asm volatile ("mov %[result], r" XSTR(FDPIC_REGNUM)
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: [result] "=r" (res));
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return res;
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}
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/* Decode an R_ARM_TARGET2 relocation. */
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static inline _Unwind_Word
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_Unwind_decode_typeinfo_ptr (_Unwind_Word base __attribute__ ((unused)),
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_Unwind_Word ptr)
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{
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_Unwind_Word tmp;
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tmp = *(_Unwind_Word *) ptr;
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/* Zero values are always NULL. */
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if (!tmp)
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return 0;
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#if __FDPIC__
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/* For FDPIC, we store the offset of the GOT entry. */
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/* So, first get GOT from dynamic linker and then use indirect access. */
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tmp += _Unwind_gnu_Find_got (ptr);
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tmp = *(_Unwind_Word *) tmp;
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#elif (defined(linux) && !defined(__uClinux__)) || defined(__NetBSD__) \
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|| defined(__FreeBSD__) || defined(__fuchsia__)
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/* Pc-relative indirect. */
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#define _GLIBCXX_OVERRIDE_TTYPE_ENCODING (DW_EH_PE_pcrel | DW_EH_PE_indirect)
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tmp += ptr;
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tmp = *(_Unwind_Word *) tmp;
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#elif defined(__symbian__) || defined(__uClinux__)
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#define _GLIBCXX_OVERRIDE_TTYPE_ENCODING (DW_EH_PE_absptr)
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/* Absolute pointer. Nothing more to do. */
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#else
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#define _GLIBCXX_OVERRIDE_TTYPE_ENCODING (DW_EH_PE_pcrel)
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/* Pc-relative pointer. */
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tmp += ptr;
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#endif
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return tmp;
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}
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static inline _Unwind_Reason_Code
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__gnu_unwind_24bit (_Unwind_Context * context __attribute__ ((unused)),
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_uw data __attribute__ ((unused)),
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int compact __attribute__ ((unused)))
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{
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return _URC_FAILURE;
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}
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#ifndef __FreeBSD__
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/* Return the address of the instruction, not the actual IP value. */
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#define _Unwind_GetIP(context) \
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(_Unwind_GetGR (context, 15) & ~(_Unwind_Word)1)
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#define _Unwind_SetIP(context, val) \
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_Unwind_SetGR (context, 15, val | (_Unwind_GetGR (context, 15) & 1))
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#else
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#undef _Unwind_GetIPInfo
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_Unwind_Ptr _Unwind_GetIP (struct _Unwind_Context *);
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_Unwind_Ptr _Unwind_GetIPInfo (struct _Unwind_Context *, int *);
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void _Unwind_SetIP (struct _Unwind_Context *, _Unwind_Ptr);
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#endif
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif /* defined UNWIND_ARM_H */
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