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8662eb14 | 1 | /* DWARF2 EH unwinding support for SH Linux. |
85ec4feb | 2 | Copyright (C) 2004-2018 Free Software Foundation, Inc. |
8662eb14 AM |
3 | |
4 | This file is part of GCC. | |
5 | ||
6 | GCC is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
748086b7 | 8 | the Free Software Foundation; either version 3, or (at your option) |
8662eb14 AM |
9 | any later version. |
10 | ||
11 | GCC is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
748086b7 JJ |
16 | Under Section 7 of GPL version 3, you are granted additional |
17 | permissions described in the GCC Runtime Library Exception, version | |
18 | 3.1, as published by the Free Software Foundation. | |
19 | ||
20 | You should have received a copy of the GNU General Public License and | |
21 | a copy of the GCC Runtime Library Exception along with this program; | |
22 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
23 | <http://www.gnu.org/licenses/>. */ | |
24 | ||
8662eb14 AM |
25 | |
26 | /* Do code reading to identify a signal frame, and set the frame | |
47e4dfcf AS |
27 | state data appropriately. See unwind-dw2.c for the structs. |
28 | Don't use this at all if inhibit_libc is used. */ | |
29 | ||
30 | #ifndef inhibit_libc | |
8662eb14 AM |
31 | |
32 | #include <signal.h> | |
33 | #include <sys/ucontext.h> | |
34 | #include "insn-constants.h" | |
35 | ||
8662eb14 AM |
36 | #define SH_DWARF_FRAME_GP0 0 |
37 | #define SH_DWARF_FRAME_FP0 25 | |
38 | #define SH_DWARF_FRAME_XD0 87 | |
39 | #define SH_DWARF_FRAME_PR 17 | |
926e663e | 40 | #define SH_DWARF_FRAME_GBR 18 |
8662eb14 AM |
41 | #define SH_DWARF_FRAME_MACH 20 |
42 | #define SH_DWARF_FRAME_MACL 21 | |
43 | #define SH_DWARF_FRAME_PC 16 | |
44 | #define SH_DWARF_FRAME_SR 22 | |
45 | #define SH_DWARF_FRAME_FPUL 23 | |
46 | #define SH_DWARF_FRAME_FPSCR 24 | |
8662eb14 AM |
47 | |
48 | #define MD_FALLBACK_FRAME_STATE_FOR sh_fallback_frame_state | |
49 | ||
50 | static _Unwind_Reason_Code | |
51 | sh_fallback_frame_state (struct _Unwind_Context *context, | |
52 | _Unwind_FrameState *fs) | |
53 | { | |
54 | unsigned char *pc = context->ra; | |
55 | struct sigcontext *sc; | |
56 | long new_cfa; | |
57 | int i; | |
58 | #if defined (__SH3E__) || defined (__SH4__) | |
59 | int r; | |
60 | #endif | |
61 | ||
62 | /* mov.w 1f,r3; trapa #0x10; 1: .short 0x77 (sigreturn) */ | |
63 | /* mov.w 1f,r3; trapa #0x10; 1: .short 0xad (rt_sigreturn) */ | |
64 | /* Newer kernel uses pad instructions to avoid an SH-4 core bug. */ | |
65 | /* mov.w 1f,r3; trapa #0x10; or r0,r0; or r0,r0; or r0,r0; or r0,r0; | |
66 | or r0,r0; 1: .short 0x77 (sigreturn) */ | |
67 | /* mov.w 1f,r3; trapa #0x10; or r0,r0; or r0,r0; or r0,r0; or r0,r0; | |
68 | or r0,r0; 1: .short 0xad (rt_sigreturn) */ | |
69 | if (((*(unsigned short *) (pc+0) == 0x9300) | |
70 | && (*(unsigned short *) (pc+2) == 0xc310) | |
71 | && (*(unsigned short *) (pc+4) == 0x0077)) | |
72 | || (((*(unsigned short *) (pc+0) == 0x9305) | |
73 | && (*(unsigned short *) (pc+2) == 0xc310) | |
74 | && (*(unsigned short *) (pc+14) == 0x0077)))) | |
75 | sc = context->cfa; | |
76 | else if (((*(unsigned short *) (pc+0) == 0x9300) | |
77 | && (*(unsigned short *) (pc+2) == 0xc310) | |
78 | && (*(unsigned short *) (pc+4) == 0x00ad)) | |
79 | || (((*(unsigned short *) (pc+0) == 0x9305) | |
80 | && (*(unsigned short *) (pc+2) == 0xc310) | |
81 | && (*(unsigned short *) (pc+14) == 0x00ad)))) | |
82 | { | |
83 | struct rt_sigframe { | |
1bde7dab | 84 | siginfo_t info; |
883312dc | 85 | ucontext_t uc; |
8662eb14 | 86 | } *rt_ = context->cfa; |
4f1eb6e3 KK |
87 | /* The void * cast is necessary to avoid an aliasing warning. |
88 | The aliasing warning is correct, but should not be a problem | |
89 | because it does not alias anything. */ | |
90 | sc = (struct sigcontext *) (void *) &rt_->uc.uc_mcontext; | |
8662eb14 AM |
91 | } |
92 | else | |
93 | return _URC_END_OF_STACK; | |
94 | ||
95 | new_cfa = sc->sc_regs[15]; | |
6673f90b NF |
96 | fs->regs.cfa_how = CFA_REG_OFFSET; |
97 | fs->regs.cfa_reg = 15; | |
98 | fs->regs.cfa_offset = new_cfa - (long) context->cfa; | |
8662eb14 AM |
99 | |
100 | for (i = 0; i < 15; i++) | |
101 | { | |
102 | fs->regs.reg[i].how = REG_SAVED_OFFSET; | |
103 | fs->regs.reg[i].loc.offset | |
104 | = (long)&(sc->sc_regs[i]) - new_cfa; | |
105 | } | |
106 | ||
107 | fs->regs.reg[SH_DWARF_FRAME_PR].how = REG_SAVED_OFFSET; | |
108 | fs->regs.reg[SH_DWARF_FRAME_PR].loc.offset | |
109 | = (long)&(sc->sc_pr) - new_cfa; | |
110 | fs->regs.reg[SH_DWARF_FRAME_SR].how = REG_SAVED_OFFSET; | |
111 | fs->regs.reg[SH_DWARF_FRAME_SR].loc.offset | |
112 | = (long)&(sc->sc_sr) - new_cfa; | |
113 | fs->regs.reg[SH_DWARF_FRAME_GBR].how = REG_SAVED_OFFSET; | |
114 | fs->regs.reg[SH_DWARF_FRAME_GBR].loc.offset | |
115 | = (long)&(sc->sc_gbr) - new_cfa; | |
116 | fs->regs.reg[SH_DWARF_FRAME_MACH].how = REG_SAVED_OFFSET; | |
117 | fs->regs.reg[SH_DWARF_FRAME_MACH].loc.offset | |
118 | = (long)&(sc->sc_mach) - new_cfa; | |
119 | fs->regs.reg[SH_DWARF_FRAME_MACL].how = REG_SAVED_OFFSET; | |
120 | fs->regs.reg[SH_DWARF_FRAME_MACL].loc.offset | |
121 | = (long)&(sc->sc_macl) - new_cfa; | |
122 | ||
123 | #if defined (__SH3E__) || defined (__SH4__) | |
124 | r = SH_DWARF_FRAME_FP0; | |
125 | for (i = 0; i < 16; i++) | |
126 | { | |
127 | fs->regs.reg[r+i].how = REG_SAVED_OFFSET; | |
128 | fs->regs.reg[r+i].loc.offset | |
129 | = (long)&(sc->sc_fpregs[i]) - new_cfa; | |
130 | } | |
131 | ||
132 | r = SH_DWARF_FRAME_XD0; | |
133 | for (i = 0; i < 8; i++) | |
134 | { | |
192c543c KK |
135 | fs->regs.reg[r+i].how = REG_SAVED_OFFSET; |
136 | fs->regs.reg[r+i].loc.offset | |
8662eb14 AM |
137 | = (long)&(sc->sc_xfpregs[2*i]) - new_cfa; |
138 | } | |
139 | ||
140 | fs->regs.reg[SH_DWARF_FRAME_FPUL].how = REG_SAVED_OFFSET; | |
141 | fs->regs.reg[SH_DWARF_FRAME_FPUL].loc.offset | |
142 | = (long)&(sc->sc_fpul) - new_cfa; | |
143 | fs->regs.reg[SH_DWARF_FRAME_FPSCR].how = REG_SAVED_OFFSET; | |
144 | fs->regs.reg[SH_DWARF_FRAME_FPSCR].loc.offset | |
145 | = (long)&(sc->sc_fpscr) - new_cfa; | |
146 | #endif | |
147 | ||
8662eb14 AM |
148 | fs->regs.reg[SH_DWARF_FRAME_PC].how = REG_SAVED_OFFSET; |
149 | fs->regs.reg[SH_DWARF_FRAME_PC].loc.offset | |
150 | = (long)&(sc->sc_pc) - new_cfa; | |
151 | fs->retaddr_column = SH_DWARF_FRAME_PC; | |
3062335c | 152 | fs->signal_frame = 1; |
8662eb14 AM |
153 | return _URC_NO_REASON; |
154 | } | |
47e4dfcf AS |
155 | |
156 | #endif /* inhibit_libc */ |