1 /* Header file for the ARM EABI unwinder
2 Copyright (C) 2003-2020 Free Software Foundation, Inc.
3 Contributed by Paul Brook
4
5 This file is free software; you can redistribute it and/or modify it
6 under the terms of the GNU General Public License as published by the
7 Free Software Foundation; either version 3, or (at your option) any
8 later version.
9
10 This file is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
14
15 Under Section 7 of GPL version 3, you are granted additional
16 permissions described in the GCC Runtime Library Exception, version
17 3.1, as published by the Free Software Foundation.
18
19 You should have received a copy of the GNU General Public License and
20 a copy of the GCC Runtime Library Exception along with this program;
21 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
22 <http://www.gnu.org/licenses/>. */
23
24 /* Language-independent unwinder header public defines. This contains both
25 ABI defined objects, and GNU support routines. */
26
27 #ifndef UNWIND_ARM_H
28 #define UNWIND_ARM_H
29
30 #include "unwind-arm-common.h"
31
32 #define UNWIND_STACK_REG 13
33 /* Use IP as a scratch register within the personality routine. */
34 #define UNWIND_POINTER_REG 12
35
36 #define FDPIC_REGNUM 9
37
38 #define STR(x) #x
39 #define XSTR(x) STR(x)
40
41 #ifdef __cplusplus
42 extern "C" {
43 #endif
44 _Unwind_Ptr __attribute__((weak)) __gnu_Unwind_Find_got (_Unwind_Ptr);
45
_Unwind_gnu_Find_got(_Unwind_Ptr ptr)46 static inline _Unwind_Ptr _Unwind_gnu_Find_got (_Unwind_Ptr ptr)
47 {
48 _Unwind_Ptr res;
49
50 if (__gnu_Unwind_Find_got)
51 res = __gnu_Unwind_Find_got (ptr);
52 else
53 __asm volatile ("mov %[result], r" XSTR(FDPIC_REGNUM)
54 : [result] "=r" (res));
55
56 return res;
57 }
58
59 /* Decode an R_ARM_TARGET2 relocation. */
60 static inline _Unwind_Word
_Unwind_decode_typeinfo_ptr(_Unwind_Word base,_Unwind_Word ptr)61 _Unwind_decode_typeinfo_ptr (_Unwind_Word base __attribute__ ((unused)),
62 _Unwind_Word ptr)
63 {
64 _Unwind_Word tmp;
65
66 tmp = *(_Unwind_Word *) ptr;
67 /* Zero values are always NULL. */
68 if (!tmp)
69 return 0;
70
71 #if __FDPIC__
72 /* For FDPIC, we store the offset of the GOT entry. */
73 /* So, first get GOT from dynamic linker and then use indirect access. */
74 tmp += _Unwind_gnu_Find_got (ptr);
75 tmp = *(_Unwind_Word *) tmp;
76 #elif (defined(linux) && !defined(__uClinux__)) || defined(__NetBSD__) \
77 || defined(__FreeBSD__) || defined(__fuchsia__)
78 /* Pc-relative indirect. */
79 #define _GLIBCXX_OVERRIDE_TTYPE_ENCODING (DW_EH_PE_pcrel | DW_EH_PE_indirect)
80 tmp += ptr;
81 tmp = *(_Unwind_Word *) tmp;
82 #elif defined(__symbian__) || defined(__uClinux__)
83 #define _GLIBCXX_OVERRIDE_TTYPE_ENCODING (DW_EH_PE_absptr)
84 /* Absolute pointer. Nothing more to do. */
85 #else
86 #define _GLIBCXX_OVERRIDE_TTYPE_ENCODING (DW_EH_PE_pcrel)
87 /* Pc-relative pointer. */
88 tmp += ptr;
89 #endif
90 return tmp;
91 }
92
93 static inline _Unwind_Reason_Code
__gnu_unwind_24bit(_Unwind_Context * context,_uw data,int compact)94 __gnu_unwind_24bit (_Unwind_Context * context __attribute__ ((unused)),
95 _uw data __attribute__ ((unused)),
96 int compact __attribute__ ((unused)))
97 {
98 return _URC_FAILURE;
99 }
100 #ifndef __FreeBSD__
101 /* Return the address of the instruction, not the actual IP value. */
102 #define _Unwind_GetIP(context) \
103 (_Unwind_GetGR (context, 15) & ~(_Unwind_Word)1)
104
105 #define _Unwind_SetIP(context, val) \
106 _Unwind_SetGR (context, 15, val | (_Unwind_GetGR (context, 15) & 1))
107 #else
108 #undef _Unwind_GetIPInfo
109 _Unwind_Ptr _Unwind_GetIP (struct _Unwind_Context *);
110 _Unwind_Ptr _Unwind_GetIPInfo (struct _Unwind_Context *, int *);
111 void _Unwind_SetIP (struct _Unwind_Context *, _Unwind_Ptr);
112 #endif
113
114 #ifdef __cplusplus
115 } /* extern "C" */
116 #endif
117
118 #endif /* defined UNWIND_ARM_H */
119