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1 | /* Translate Mach exception codes into signal numbers. i386 version. | |
2 | Copyright (C) 1991-2019 Free Software Foundation, Inc. | |
3 | This file is part of the GNU C Library. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
17 | <https://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <hurd.h> | |
20 | #include <hurd/signal.h> | |
21 | #include <mach/exception.h> | |
22 | ||
23 | /* Translate the Mach exception codes, as received in an `exception_raise' RPC, | |
24 | into a signal number and signal subcode. */ | |
25 | ||
26 | void | |
27 | _hurd_exception2signal (struct hurd_signal_detail *detail, int *signo) | |
28 | { | |
29 | detail->error = 0; | |
30 | ||
31 | switch (detail->exc) | |
32 | { | |
33 | default: | |
34 | *signo = SIGIOT; | |
35 | detail->code = detail->exc; | |
36 | break; | |
37 | ||
38 | case EXC_BAD_ACCESS: | |
39 | if (detail->exc_code == KERN_INVALID_ADDRESS | |
40 | || detail->exc_code == KERN_PROTECTION_FAILURE | |
41 | || detail->exc_code == KERN_WRITE_PROTECTION_FAILURE) | |
42 | *signo = SIGSEGV; | |
43 | else | |
44 | *signo = SIGBUS; | |
45 | detail->code = detail->exc_subcode; | |
46 | detail->error = detail->exc_code; | |
47 | break; | |
48 | ||
49 | case EXC_BAD_INSTRUCTION: | |
50 | *signo = SIGILL; | |
51 | if (detail->exc_code == EXC_I386_INVOP) | |
52 | detail->code = ILL_INVOPR_FAULT; | |
53 | else if (detail->exc_code == EXC_I386_STKFLT) | |
54 | detail->code = ILL_STACK_FAULT; | |
55 | else | |
56 | detail->code = 0; | |
57 | break; | |
58 | ||
59 | case EXC_ARITHMETIC: | |
60 | switch (detail->exc_code) | |
61 | { | |
62 | case EXC_I386_DIV: /* integer divide by zero */ | |
63 | *signo = SIGFPE; | |
64 | detail->code = FPE_INTDIV_FAULT; | |
65 | break; | |
66 | ||
67 | case EXC_I386_INTO: /* integer overflow */ | |
68 | *signo = SIGFPE; | |
69 | detail->code = FPE_INTOVF_TRAP; | |
70 | break; | |
71 | ||
72 | /* These aren't anywhere documented or used in Mach 3.0. */ | |
73 | case EXC_I386_NOEXT: | |
74 | case EXC_I386_EXTOVR: | |
75 | default: | |
76 | *signo = SIGFPE; | |
77 | detail->code = 0; | |
78 | break; | |
79 | ||
80 | case EXC_I386_EXTERR: | |
81 | /* Subcode is the fp_status word saved by the hardware. | |
82 | Give an error code corresponding to the first bit set. */ | |
83 | if (detail->exc_subcode & FPS_IE) | |
84 | { | |
85 | *signo = SIGILL; | |
86 | detail->code = ILL_FPEOPR_FAULT; | |
87 | } | |
88 | else if (detail->exc_subcode & FPS_DE) | |
89 | { | |
90 | *signo = SIGFPE; | |
91 | detail->code = FPE_FLTDNR_FAULT; | |
92 | } | |
93 | else if (detail->exc_subcode & FPS_ZE) | |
94 | { | |
95 | *signo = SIGFPE; | |
96 | detail->code = FPE_FLTDIV_FAULT; | |
97 | } | |
98 | else if (detail->exc_subcode & FPS_OE) | |
99 | { | |
100 | *signo = SIGFPE; | |
101 | detail->code = FPE_FLTOVF_FAULT; | |
102 | } | |
103 | else if (detail->exc_subcode & FPS_UE) | |
104 | { | |
105 | *signo = SIGFPE; | |
106 | detail->code = FPE_FLTUND_FAULT; | |
107 | } | |
108 | else if (detail->exc_subcode & FPS_PE) | |
109 | { | |
110 | *signo = SIGFPE; | |
111 | detail->code = FPE_FLTINX_FAULT; | |
112 | } | |
113 | else | |
114 | { | |
115 | *signo = SIGFPE; | |
116 | detail->code = 0; | |
117 | } | |
118 | break; | |
119 | ||
120 | /* These two can only be arithmetic exceptions if we | |
121 | are in V86 mode, which sounds like emulation to me. | |
122 | (See Mach 3.0 i386/trap.c.) */ | |
123 | case EXC_I386_EMERR: | |
124 | *signo = SIGFPE; | |
125 | detail->code = FPE_EMERR_FAULT; | |
126 | break; | |
127 | case EXC_I386_BOUND: | |
128 | *signo = SIGFPE; | |
129 | detail->code = FPE_EMBND_FAULT; | |
130 | break; | |
131 | } | |
132 | break; | |
133 | ||
134 | case EXC_EMULATION: | |
135 | /* 3.0 doesn't give this one, why, I don't know. */ | |
136 | *signo = SIGEMT; | |
137 | detail->code = 0; | |
138 | break; | |
139 | ||
140 | case EXC_SOFTWARE: | |
141 | /* The only time we get this in Mach 3.0 | |
142 | is for an out of bounds trap. */ | |
143 | if (detail->exc_code == EXC_I386_BOUND) | |
144 | { | |
145 | *signo = SIGFPE; | |
146 | detail->code = FPE_SUBRNG_FAULT; | |
147 | } | |
148 | else | |
149 | { | |
150 | *signo = SIGEMT; | |
151 | detail->code = 0; | |
152 | } | |
153 | break; | |
154 | ||
155 | case EXC_BREAKPOINT: | |
156 | *signo = SIGTRAP; | |
157 | if (detail->exc_code == EXC_I386_SGL) | |
158 | detail->code = DBG_SINGLE_TRAP; | |
159 | else if (detail->exc_code == EXC_I386_BPT) | |
160 | detail->code = DBG_BRKPNT_FAULT; | |
161 | else | |
162 | detail->code = 0; | |
163 | break; | |
164 | } | |
165 | } | |
166 | libc_hidden_def (_hurd_exception2signal) |