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d1e63c94 HH |
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 | ||
29 | struct 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 | ||
36 | struct 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 | ||
44 | struct 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 | ||
51 | static 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 | ||
84 | static 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 | ||
113 | static 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 | ||
153 | asmlinkage 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 | ||
186 | badframe: | |
187 | force_sig(SIGSEGV, current); | |
188 | } | |
189 | ||
190 | static 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 | */ | |
240 | struct 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 | ||
253 | asmlinkage 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 | ||
283 | badframe: | |
284 | force_sig(SIGSEGV, current); | |
285 | } |