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19a95697 RZ |
1 | /* DWARF2 EH unwinding support for Linux/m68k. |
2 | Copyright (C) 2006 Free Software Foundation, Inc. | |
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 | |
8 | the Free Software Foundation; either version 2, or (at your option) | |
9 | any later version. | |
10 | ||
11 | In addition to the permissions in the GNU General Public License, the | |
12 | Free Software Foundation gives you unlimited permission to link the | |
13 | compiled version of this file with other programs, and to distribute | |
14 | those programs without any restriction coming from the use of this | |
15 | file. (The General Public License restrictions do apply in other | |
16 | respects; for example, they cover modification of the file, and | |
17 | distribution when not linked into another program.) | |
18 | ||
19 | GCC is distributed in the hope that it will be useful, | |
20 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22 | GNU General Public License for more details. | |
23 | ||
24 | You should have received a copy of the GNU General Public License | |
25 | along with GCC; see the file COPYING. If not, write to | |
26 | the Free Software Foundation, 51 Franklin Street, Fifth Floor, | |
27 | Boston, MA 02110-1301, USA. */ | |
28 | ||
29 | /* Do code reading to identify a signal frame, and set the frame | |
30 | state data appropriately. See unwind-dw2.c for the structs. | |
31 | Don't use this at all if inhibit_libc is used. */ | |
32 | ||
33 | #ifndef inhibit_libc | |
34 | ||
35 | #include <signal.h> | |
36 | ||
da08281c | 37 | /* <sys/ucontext.h> is unfortunately broken right now. */ |
19a95697 RZ |
38 | struct uw_ucontext { |
39 | unsigned long uc_flags; | |
40 | struct ucontext *uc_link; | |
41 | stack_t uc_stack; | |
42 | mcontext_t uc_mcontext; | |
43 | unsigned long uc_filler[80]; | |
44 | __sigset_t uc_sigmask; | |
45 | }; | |
46 | ||
47 | #define MD_FALLBACK_FRAME_STATE_FOR m68k_fallback_frame_state | |
48 | ||
49 | #ifdef __mcoldfire__ | |
50 | #define M68K_FP_SIZE 8 | |
51 | #else | |
52 | #define M68K_FP_SIZE 12 | |
53 | #endif | |
54 | ||
55 | static _Unwind_Reason_Code | |
56 | m68k_fallback_frame_state (struct _Unwind_Context *context, | |
57 | _Unwind_FrameState *fs) | |
58 | { | |
59 | unsigned short *pc = context->ra; | |
60 | long cfa; | |
61 | ||
62 | /* moveq #__NR_sigreturn,%d0; trap #0 */ | |
63 | if (pc[0] == 0x7077 && pc[1] == 0x4e40) | |
64 | { | |
65 | struct sigcontext *sc; | |
66 | ||
67 | /* Context is passed as the 3rd argument. */ | |
68 | sc = *(struct sigcontext **) (context->cfa + 8); | |
69 | ||
70 | cfa = sc->sc_usp; | |
71 | fs->regs.cfa_how = CFA_REG_OFFSET; | |
72 | fs->regs.cfa_reg = 15; | |
73 | fs->regs.cfa_offset = cfa - (long) context->cfa; | |
74 | ||
75 | fs->regs.reg[0].how = REG_SAVED_OFFSET; | |
76 | fs->regs.reg[0].loc.offset = (long) &sc->sc_d0 - cfa; | |
77 | fs->regs.reg[1].how = REG_SAVED_OFFSET; | |
78 | fs->regs.reg[1].loc.offset = (long) &sc->sc_d1 - cfa; | |
79 | fs->regs.reg[8].how = REG_SAVED_OFFSET; | |
80 | fs->regs.reg[8].loc.offset = (long) &sc->sc_a0 - cfa; | |
81 | fs->regs.reg[9].how = REG_SAVED_OFFSET; | |
82 | fs->regs.reg[9].loc.offset = (long) &sc->sc_a1 - cfa; | |
83 | ||
84 | fs->regs.reg[24].how = REG_SAVED_OFFSET; | |
85 | fs->regs.reg[24].loc.offset = (long) &sc->sc_pc - cfa; | |
86 | ||
87 | if (*(int *) sc->sc_fpstate) | |
88 | { | |
89 | int *fpregs = (int *) sc->sc_fpregs; | |
90 | ||
91 | fs->regs.reg[16].how = REG_SAVED_OFFSET; | |
92 | fs->regs.reg[16].loc.offset = (long) &fpregs[0] - cfa; | |
93 | fs->regs.reg[17].how = REG_SAVED_OFFSET; | |
94 | fs->regs.reg[17].loc.offset = (long) &fpregs[M68K_FP_SIZE/4] - cfa; | |
95 | } | |
96 | } | |
97 | #ifdef __mcoldfire__ | |
98 | /* move.l #__NR_rt_sigreturn,%d0; trap #0 */ | |
99 | else if (pc[0] == 0x203c && pc[1] == 0x0000 && | |
100 | pc[2] == 0x00ad && pc[3] == 0x4e40) | |
101 | #else | |
102 | /* moveq #~__NR_rt_sigreturn,%d0; not.b %d0; trap #0 */ | |
103 | else if (pc[0] == 0x7052 && pc[1] == 0x4600 && pc[2] == 0x4e40) | |
104 | #endif | |
105 | { | |
106 | struct uw_ucontext *uc; | |
107 | greg_t *gregs; | |
108 | int i; | |
109 | ||
110 | /* Context is passed as the 3rd argument. */ | |
111 | uc = *(struct uw_ucontext **) (context->cfa + 8); | |
112 | ||
113 | gregs = uc->uc_mcontext.gregs; | |
114 | cfa = gregs[15]; | |
115 | fs->regs.cfa_how = CFA_REG_OFFSET; | |
116 | fs->regs.cfa_reg = 15; | |
117 | fs->regs.cfa_offset = cfa - (long) context->cfa; | |
118 | ||
119 | /* register %d0-%d7/%a0-%a6 */ | |
120 | for (i = 0; i <= 14; i++) | |
121 | { | |
122 | fs->regs.reg[i].how = REG_SAVED_OFFSET; | |
123 | fs->regs.reg[i].loc.offset = (long) &gregs[i] - cfa; | |
124 | } | |
125 | ||
126 | /* return address */ | |
127 | fs->regs.reg[24].how = REG_SAVED_OFFSET; | |
128 | fs->regs.reg[24].loc.offset = (long) &gregs[16] - cfa; | |
129 | ||
130 | #define uc_fpstate uc_filler[0] | |
131 | ||
132 | if (uc->uc_fpstate) | |
133 | { | |
134 | long fpregs = (long) uc->uc_mcontext.fpregs.f_fpregs; | |
135 | ||
136 | /* register %fp0-%fp7 */ | |
137 | for (i = 16; i <= 23; i++) | |
138 | { | |
139 | fs->regs.reg[i].how = REG_SAVED_OFFSET; | |
140 | fs->regs.reg[i].loc.offset = fpregs - cfa; | |
141 | fpregs += M68K_FP_SIZE; | |
142 | } | |
143 | } | |
144 | } | |
145 | else | |
146 | return _URC_END_OF_STACK; | |
147 | ||
148 | fs->retaddr_column = 24; | |
149 | fs->signal_frame = 1; | |
150 | ||
151 | return _URC_NO_REASON; | |
152 | } | |
153 | #endif /* ifdef inhibit_libc */ |