1 // SPDX-License-Identifier: GPL-2.0-or-later 1
2 /* Signal support for 32-bit kernel builds
3 *
4 * Copyright (C) 2001 Matthew Wilcox <willy
5 * Copyright (C) 2006 Kyle McMartin <kyle a
6 *
7 * Code was mostly borrowed from kernel/sig
8 * See kernel/signal.c for additional Copyr
9 */
10
11 #include <linux/compat.h>
12 #include <linux/module.h>
13 #include <linux/unistd.h>
14 #include <linux/init.h>
15 #include <linux/sched.h>
16 #include <linux/syscalls.h>
17 #include <linux/types.h>
18 #include <linux/errno.h>
19
20 #include <linux/uaccess.h>
21
22 #include "signal32.h"
23
24 #define DEBUG_COMPAT_SIG 0
25 #define DEBUG_COMPAT_SIG_LEVEL 2
26
27 #if DEBUG_COMPAT_SIG
28 #define DBG(LEVEL, ...) \
29 ((DEBUG_COMPAT_SIG_LEVEL >= LEVEL) \
30 ? printk(__VA_ARGS__) : (void) 0)
31 #else
32 #define DBG(LEVEL, ...)
33 #endif
34
35 long
36 restore_sigcontext32(struct compat_sigcontext
37 struct pt_regs *regs)
38 {
39 long err = 0;
40 compat_uint_t compat_reg;
41 compat_uint_t compat_regt;
42 int regn;
43
44 /* When loading 32-bit values into 64-
45 sure to clear the upper 32-bits */
46 DBG(2,"restore_sigcontext32: PER_LINUX
47 DBG(2,"restore_sigcontext32: sc = 0x%p
48 DBG(2,"restore_sigcontext32: compat_si
49 for(regn=0; regn < 32; regn++){
50 err |= __get_user(compat_reg,&
51 regs->gr[regn] = compat_reg;
52 /* Load upper half */
53 err |= __get_user(compat_regt,
54 regs->gr[regn] = ((u64)compat_
55 DBG(3,"restore_sigcontext32: g
56 regn, regs->gr
57 }
58 DBG(2,"restore_sigcontext32: sc->sc_fr
59 /* XXX: BE WARNED FR's are 64-BIT! */
60 err |= __copy_from_user(regs->fr, sc->
61
62 /* Better safe than sorry, pass __get_
63 the same size and let gcc do the up
64 64-bits */
65 err |= __get_user(compat_reg, &sc->sc_
66 /* Load upper half */
67 err |= __get_user(compat_regt, &rf->rf
68 regs->iaoq[0] = ((u64)compat_regt << 3
69 DBG(2,"restore_sigcontext32: upper hal
70 DBG(2,"restore_sigcontext32: sc->sc_ia
71 &sc->sc_iaoq[0], compa
72
73 err |= __get_user(compat_reg, &sc->sc_
74 /* Load upper half */
75 err |= __get_user(compat_regt, &rf->rf
76 regs->iaoq[1] = ((u64)compat_regt << 3
77 DBG(2,"restore_sigcontext32: upper hal
78 DBG(2,"restore_sigcontext32: sc->sc_ia
79 &sc->sc_iaoq[1],compat
80 DBG(2,"restore_sigcontext32: iaoq is %
81 regs->iaoq[0],regs->ia
82
83 err |= __get_user(compat_reg, &sc->sc_
84 /* Load the upper half for iasq */
85 err |= __get_user(compat_regt, &rf->rf
86 regs->iasq[0] = ((u64)compat_regt << 3
87 DBG(2,"restore_sigcontext32: upper hal
88
89 err |= __get_user(compat_reg, &sc->sc_
90 /* Load the upper half for iasq */
91 err |= __get_user(compat_regt, &rf->rf
92 regs->iasq[1] = ((u64)compat_regt << 3
93 DBG(2,"restore_sigcontext32: upper hal
94 DBG(2,"restore_sigcontext32: iasq is %
95 regs->iasq[0],regs->iasq[1]);
96
97 err |= __get_user(compat_reg, &sc->sc_
98 /* Load the upper half for sar */
99 err |= __get_user(compat_regt, &rf->rf
100 regs->sar = ((u64)compat_regt << 32) |
101 DBG(2,"restore_sigcontext32: upper_hal
102 DBG(2,"restore_sigcontext32: sar is %#
103 DBG(2,"restore_sigcontext32: r28 is %l
104
105 return err;
106 }
107
108 /*
109 * Set up the sigcontext structure for this pr
110 * This is not an easy task if the kernel is 6
111 * that we examine the process personality to
112 * truncate for a 32-bit userspace.
113 */
114 long
115 setup_sigcontext32(struct compat_sigcontext __
116 struct pt_regs *regs, int in_s
117 {
118 compat_int_t flags = 0;
119 long err = 0;
120 compat_uint_t compat_reg;
121 compat_uint_t compat_regb;
122 int regn;
123
124 if (on_sig_stack((unsigned long) sc))
125 flags |= PARISC_SC_FLAG_ONSTAC
126
127 if (in_syscall) {
128
129 DBG(1,"setup_sigcontext32: in_
130
131 flags |= PARISC_SC_FLAG_IN_SYS
132 /* Truncate gr31 */
133 compat_reg = (compat_uint_t)(r
134 /* regs->iaoq is undefined in
135 err |= __put_user(compat_reg,
136 DBG(2,"setup_sigcontext32: sc-
137 &sc->sc_iaoq[0
138
139 /* Store upper half */
140 compat_reg = (compat_uint_t)(r
141 err |= __put_user(compat_reg,
142 DBG(2,"setup_sigcontext32: upp
143
144
145 compat_reg = (compat_uint_t)(r
146 err |= __put_user(compat_reg,
147 DBG(2,"setup_sigcontext32: sc-
148 &sc->sc_iaoq[1
149 /* Store upper half */
150 compat_reg = (compat_uint_t)((
151 err |= __put_user(compat_reg,
152 DBG(2,"setup_sigcontext32: upp
153
154 /* Truncate sr3 */
155 compat_reg = (compat_uint_t)(r
156 err |= __put_user(compat_reg,
157 err |= __put_user(compat_reg,
158
159 /* Store upper half */
160 compat_reg = (compat_uint_t)(r
161 err |= __put_user(compat_reg,
162 err |= __put_user(compat_reg,
163
164 DBG(2,"setup_sigcontext32: upp
165 DBG(2,"setup_sigcontext32: upp
166 DBG(1,"setup_sigcontext32: iao
167 regs->gr[31], regs->gr
168
169 } else {
170
171 compat_reg = (compat_uint_t)(r
172 err |= __put_user(compat_reg,
173 DBG(2,"setup_sigcontext32: sc-
174 &sc->sc_iaoq[0
175 /* Store upper half */
176 compat_reg = (compat_uint_t)(r
177 err |= __put_user(compat_reg,
178 DBG(2,"setup_sigcontext32: upp
179
180 compat_reg = (compat_uint_t)(r
181 err |= __put_user(compat_reg,
182 DBG(2,"setup_sigcontext32: sc-
183 &sc->sc_iaoq[1
184 /* Store upper half */
185 compat_reg = (compat_uint_t)(r
186 err |= __put_user(compat_reg,
187 DBG(2,"setup_sigcontext32: upp
188
189
190 compat_reg = (compat_uint_t)(r
191 err |= __put_user(compat_reg,
192 DBG(2,"setup_sigcontext32: sc-
193 &sc->sc_iasq[0
194 /* Store upper half */
195 compat_reg = (compat_uint_t)(r
196 err |= __put_user(compat_reg,
197 DBG(2,"setup_sigcontext32: upp
198
199
200 compat_reg = (compat_uint_t)(r
201 err |= __put_user(compat_reg,
202 DBG(2,"setup_sigcontext32: sc-
203 &sc->sc_iasq[1
204 /* Store upper half */
205 compat_reg = (compat_uint_t)(r
206 err |= __put_user(compat_reg,
207 DBG(2,"setup_sigcontext32: upp
208
209 /* Print out the IAOQ for debu
210 DBG(1,"setup_sigcontext32: ia0
211 regs->iaoq[0], regs->i
212 }
213
214 err |= __put_user(flags, &sc->sc_flags
215
216 DBG(1,"setup_sigcontext32: Truncating
217
218 for(regn=0; regn < 32; regn++){
219 /* Truncate a general register
220 compat_reg = (compat_uint_t)(r
221 err |= __put_user(compat_reg,
222 /* Store upper half */
223 compat_regb = (compat_uint_t)(
224 err |= __put_user(compat_regb,
225
226 /* DEBUG: Write out the "upper
227 DBG(2,"setup_sigcontext32: gr%
228 compat_regb, c
229 }
230
231 /* Copy the floating point registers (
232 XXX: BE WARNED FR's are 64-BIT! */
233 DBG(1,"setup_sigcontext32: Copying fro
234 "sc->sc_fr size = %#lx, regs->fr
235 sizeof(regs->fr), sizeof(sc->s
236 err |= __copy_to_user(sc->sc_fr, regs-
237
238 compat_reg = (compat_uint_t)(regs->sar
239 err |= __put_user(compat_reg, &sc->sc_
240 DBG(2,"setup_sigcontext32: sar is %#x\
241 /* Store upper half */
242 compat_reg = (compat_uint_t)(regs->sar
243 err |= __put_user(compat_reg, &rf->rf_
244 DBG(2,"setup_sigcontext32: upper half
245 DBG(1,"setup_sigcontext32: r28 is %ld\
246
247 return err;
248 }
249
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