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1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1991, 1992 Linus Torvalds
7 * Copyright (C) 1994 - 2000, 2006 Ralf Baechle
8 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
9 * Copyright (C) 2016, Imagination Technologies Ltd.
10 */
11#include <linux/compiler.h>
12#include <linux/errno.h>
13#include <linux/signal.h>
14#include <linux/uaccess.h>
15
16#include <asm/abi.h>
17#include <asm/compat-signal.h>
18#include <asm/dsp.h>
19#include <asm/sim.h>
20#include <asm/unistd.h>
21
22#include "signal-common.h"
23
24/*
25 * Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
26 */
27#define __NR_O32_restart_syscall 4253
28
29struct sigframe32 {
30 u32 sf_ass[4]; /* argument save space for o32 */
31 u32 sf_pad[2]; /* Was: signal trampoline */
32 struct sigcontext32 sf_sc;
33 compat_sigset_t sf_mask;
34};
35
36struct ucontext32 {
37 u32 uc_flags;
38 s32 uc_link;
39 compat_stack_t uc_stack;
40 struct sigcontext32 uc_mcontext;
41 compat_sigset_t uc_sigmask; /* mask last for extensibility */
42};
43
44struct rt_sigframe32 {
45 u32 rs_ass[4]; /* argument save space for o32 */
46 u32 rs_pad[2]; /* Was: signal trampoline */
47 compat_siginfo_t rs_info;
48 struct ucontext32 rs_uc;
49};
50
51static int setup_sigcontext32(struct pt_regs *regs,
52 struct sigcontext32 __user *sc)
53{
54 int err = 0;
55 int i;
56
57 err |= __put_user(regs->cp0_epc, &sc->sc_pc);
58
59 err |= __put_user(0, &sc->sc_regs[0]);
60 for (i = 1; i < 32; i++)
61 err |= __put_user(regs->regs[i], &sc->sc_regs[i]);
62
63 err |= __put_user(regs->hi, &sc->sc_mdhi);
64 err |= __put_user(regs->lo, &sc->sc_mdlo);
65 if (cpu_has_dsp) {
66 err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp);
67 err |= __put_user(mfhi1(), &sc->sc_hi1);
68 err |= __put_user(mflo1(), &sc->sc_lo1);
69 err |= __put_user(mfhi2(), &sc->sc_hi2);
70 err |= __put_user(mflo2(), &sc->sc_lo2);
71 err |= __put_user(mfhi3(), &sc->sc_hi3);
72 err |= __put_user(mflo3(), &sc->sc_lo3);
73 }
74
75 /*
76 * Save FPU state to signal context. Signal handler
77 * will "inherit" current FPU state.
78 */
79 err |= protected_save_fp_context(sc);
80
81 return err;
82}
83
84static int restore_sigcontext32(struct pt_regs *regs,
85 struct sigcontext32 __user *sc)
86{
87 int err = 0;
88 s32 treg;
89 int i;
90
91 /* Always make any pending restarted system calls return -EINTR */
92 current->restart_block.fn = do_no_restart_syscall;
93
94 err |= __get_user(regs->cp0_epc, &sc->sc_pc);
95 err |= __get_user(regs->hi, &sc->sc_mdhi);
96 err |= __get_user(regs->lo, &sc->sc_mdlo);
97 if (cpu_has_dsp) {
98 err |= __get_user(treg, &sc->sc_hi1); mthi1(treg);
99 err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg);
100 err |= __get_user(treg, &sc->sc_hi2); mthi2(treg);
101 err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg);
102 err |= __get_user(treg, &sc->sc_hi3); mthi3(treg);
103 err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg);
104 err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK);
105 }
106
107 for (i = 1; i < 32; i++)
108 err |= __get_user(regs->regs[i], &sc->sc_regs[i]);
109
110 return err ?: protected_restore_fp_context(sc);
111}
112
113static int setup_frame_32(void *sig_return, struct ksignal *ksig,
114 struct pt_regs *regs, sigset_t *set)
115{
116 struct sigframe32 __user *frame;
117 int err = 0;
118
119 frame = get_sigframe(ksig, regs, sizeof(*frame));
120 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
121 return -EFAULT;
122
123 err |= setup_sigcontext32(regs, &frame->sf_sc);
124 err |= __copy_conv_sigset_to_user(&frame->sf_mask, set);
125
126 if (err)
127 return -EFAULT;
128
129 /*
130 * Arguments to signal handler:
131 *
132 * a0 = signal number
133 * a1 = 0 (should be cause)
134 * a2 = pointer to struct sigcontext
135 *
136 * $25 and c0_epc point to the signal handler, $29 points to the
137 * struct sigframe.
138 */
139 regs->regs[ 4] = ksig->sig;
140 regs->regs[ 5] = 0;
141 regs->regs[ 6] = (unsigned long) &frame->sf_sc;
142 regs->regs[29] = (unsigned long) frame;
143 regs->regs[31] = (unsigned long) sig_return;
144 regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler;
145
146 DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
147 current->comm, current->pid,
148 frame, regs->cp0_epc, regs->regs[31]);
149
150 return 0;
151}
152
153asmlinkage void sys32_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
154{
155 struct rt_sigframe32 __user *frame;
156 sigset_t set;
157 int sig;
158
159 frame = (struct rt_sigframe32 __user *) regs.regs[29];
160 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
161 goto badframe;
162 if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask))
163 goto badframe;
164
165 set_current_blocked(&set);
166
167 sig = restore_sigcontext32(®s, &frame->rs_uc.uc_mcontext);
168 if (sig < 0)
169 goto badframe;
170 else if (sig)
171 force_sig(sig, current);
172
173 if (compat_restore_altstack(&frame->rs_uc.uc_stack))
174 goto badframe;
175
176 /*
177 * Don't let your children do this ...
178 */
179 __asm__ __volatile__(
180 "move\t$29, %0\n\t"
181 "j\tsyscall_exit"
182 :/* no outputs */
183 :"r" (®s));
184 /* Unreached */
185
186badframe:
187 force_sig(SIGSEGV, current);
188}
189
190static int setup_rt_frame_32(void *sig_return, struct ksignal *ksig,
191 struct pt_regs *regs, sigset_t *set)
192{
193 struct rt_sigframe32 __user *frame;
194 int err = 0;
195
196 frame = get_sigframe(ksig, regs, sizeof(*frame));
197 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
198 return -EFAULT;
199
200 /* Convert (siginfo_t -> compat_siginfo_t) and copy to user. */
201 err |= copy_siginfo_to_user32(&frame->rs_info, &ksig->info);
202
203 /* Create the ucontext. */
204 err |= __put_user(0, &frame->rs_uc.uc_flags);
205 err |= __put_user(0, &frame->rs_uc.uc_link);
206 err |= __compat_save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]);
207 err |= setup_sigcontext32(regs, &frame->rs_uc.uc_mcontext);
208 err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set);
209
210 if (err)
211 return -EFAULT;
212
213 /*
214 * Arguments to signal handler:
215 *
216 * a0 = signal number
217 * a1 = 0 (should be cause)
218 * a2 = pointer to ucontext
219 *
220 * $25 and c0_epc point to the signal handler, $29 points to
221 * the struct rt_sigframe32.
222 */
223 regs->regs[ 4] = ksig->sig;
224 regs->regs[ 5] = (unsigned long) &frame->rs_info;
225 regs->regs[ 6] = (unsigned long) &frame->rs_uc;
226 regs->regs[29] = (unsigned long) frame;
227 regs->regs[31] = (unsigned long) sig_return;
228 regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler;
229
230 DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
231 current->comm, current->pid,
232 frame, regs->cp0_epc, regs->regs[31]);
233
234 return 0;
235}
236
237/*
238 * o32 compatibility on 64-bit kernels, without DSP ASE
239 */
240struct mips_abi mips_abi_32 = {
241 .setup_frame = setup_frame_32,
242 .setup_rt_frame = setup_rt_frame_32,
243 .restart = __NR_O32_restart_syscall,
244
245 .off_sc_fpregs = offsetof(struct sigcontext32, sc_fpregs),
246 .off_sc_fpc_csr = offsetof(struct sigcontext32, sc_fpc_csr),
247 .off_sc_used_math = offsetof(struct sigcontext32, sc_used_math),
248
249 .vdso = &vdso_image_o32,
250};
251
252
253asmlinkage void sys32_sigreturn(nabi_no_regargs struct pt_regs regs)
254{
255 struct sigframe32 __user *frame;
256 sigset_t blocked;
257 int sig;
258
259 frame = (struct sigframe32 __user *) regs.regs[29];
260 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
261 goto badframe;
262 if (__copy_conv_sigset_from_user(&blocked, &frame->sf_mask))
263 goto badframe;
264
265 set_current_blocked(&blocked);
266
267 sig = restore_sigcontext32(®s, &frame->sf_sc);
268 if (sig < 0)
269 goto badframe;
270 else if (sig)
271 force_sig(sig, current);
272
273 /*
274 * Don't let your children do this ...
275 */
276 __asm__ __volatile__(
277 "move\t$29, %0\n\t"
278 "j\tsyscall_exit"
279 :/* no outputs */
280 :"r" (®s));
281 /* Unreached */
282
283badframe:
284 force_sig(SIGSEGV, current);
285}