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
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.
11 #include <linux/compiler.h>
12 #include <linux/errno.h>
13 #include <linux/signal.h>
14 #include <linux/sched/signal.h>
15 #include <linux/uaccess.h>
18 #include <asm/compat-signal.h>
21 #include <asm/unistd.h>
23 #include "signal-common.h"
26 * Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
28 #define __NR_O32_restart_syscall 4253
31 u32 sf_ass[4]; /* argument save space for o32 */
32 u32 sf_pad[2]; /* Was: signal trampoline */
33 struct sigcontext32 sf_sc;
34 compat_sigset_t sf_mask;
40 compat_stack_t uc_stack;
41 struct sigcontext32 uc_mcontext;
42 compat_sigset_t uc_sigmask; /* mask last for extensibility */
45 struct rt_sigframe32 {
46 u32 rs_ass[4]; /* argument save space for o32 */
47 u32 rs_pad[2]; /* Was: signal trampoline */
48 compat_siginfo_t rs_info;
49 struct ucontext32 rs_uc;
52 static int setup_sigcontext32(struct pt_regs *regs,
53 struct sigcontext32 __user *sc)
58 err |= __put_user(regs->cp0_epc, &sc->sc_pc);
60 err |= __put_user(0, &sc->sc_regs[0]);
61 for (i = 1; i < 32; i++)
62 err |= __put_user(regs->regs[i], &sc->sc_regs[i]);
64 err |= __put_user(regs->hi, &sc->sc_mdhi);
65 err |= __put_user(regs->lo, &sc->sc_mdlo);
67 err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp);
68 err |= __put_user(mfhi1(), &sc->sc_hi1);
69 err |= __put_user(mflo1(), &sc->sc_lo1);
70 err |= __put_user(mfhi2(), &sc->sc_hi2);
71 err |= __put_user(mflo2(), &sc->sc_lo2);
72 err |= __put_user(mfhi3(), &sc->sc_hi3);
73 err |= __put_user(mflo3(), &sc->sc_lo3);
77 * Save FPU state to signal context. Signal handler
78 * will "inherit" current FPU state.
80 err |= protected_save_fp_context(sc);
85 static int restore_sigcontext32(struct pt_regs *regs,
86 struct sigcontext32 __user *sc)
92 /* Always make any pending restarted system calls return -EINTR */
93 current->restart_block.fn = do_no_restart_syscall;
95 err |= __get_user(regs->cp0_epc, &sc->sc_pc);
96 err |= __get_user(regs->hi, &sc->sc_mdhi);
97 err |= __get_user(regs->lo, &sc->sc_mdlo);
99 err |= __get_user(treg, &sc->sc_hi1); mthi1(treg);
100 err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg);
101 err |= __get_user(treg, &sc->sc_hi2); mthi2(treg);
102 err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg);
103 err |= __get_user(treg, &sc->sc_hi3); mthi3(treg);
104 err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg);
105 err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK);
108 for (i = 1; i < 32; i++)
109 err |= __get_user(regs->regs[i], &sc->sc_regs[i]);
111 return err ?: protected_restore_fp_context(sc);
114 static int setup_frame_32(void *sig_return, struct ksignal *ksig,
115 struct pt_regs *regs, sigset_t *set)
117 struct sigframe32 __user *frame;
120 frame = get_sigframe(ksig, regs, sizeof(*frame));
121 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
124 err |= setup_sigcontext32(regs, &frame->sf_sc);
125 err |= __copy_conv_sigset_to_user(&frame->sf_mask, set);
131 * Arguments to signal handler:
134 * a1 = 0 (should be cause)
135 * a2 = pointer to struct sigcontext
137 * $25 and c0_epc point to the signal handler, $29 points to the
140 regs->regs[ 4] = ksig->sig;
142 regs->regs[ 6] = (unsigned long) &frame->sf_sc;
143 regs->regs[29] = (unsigned long) frame;
144 regs->regs[31] = (unsigned long) sig_return;
145 regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler;
147 DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
148 current->comm, current->pid,
149 frame, regs->cp0_epc, regs->regs[31]);
154 asmlinkage void sys32_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
156 struct rt_sigframe32 __user *frame;
160 frame = (struct rt_sigframe32 __user *) regs.regs[29];
161 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
163 if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask))
166 set_current_blocked(&set);
168 sig = restore_sigcontext32(®s, &frame->rs_uc.uc_mcontext);
172 force_sig(sig, current);
174 if (compat_restore_altstack(&frame->rs_uc.uc_stack))
178 * Don't let your children do this ...
180 __asm__ __volatile__(
188 force_sig(SIGSEGV, current);
191 static int setup_rt_frame_32(void *sig_return, struct ksignal *ksig,
192 struct pt_regs *regs, sigset_t *set)
194 struct rt_sigframe32 __user *frame;
197 frame = get_sigframe(ksig, regs, sizeof(*frame));
198 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
201 /* Convert (siginfo_t -> compat_siginfo_t) and copy to user. */
202 err |= copy_siginfo_to_user32(&frame->rs_info, &ksig->info);
204 /* Create the ucontext. */
205 err |= __put_user(0, &frame->rs_uc.uc_flags);
206 err |= __put_user(0, &frame->rs_uc.uc_link);
207 err |= __compat_save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]);
208 err |= setup_sigcontext32(regs, &frame->rs_uc.uc_mcontext);
209 err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set);
215 * Arguments to signal handler:
218 * a1 = 0 (should be cause)
219 * a2 = pointer to ucontext
221 * $25 and c0_epc point to the signal handler, $29 points to
222 * the struct rt_sigframe32.
224 regs->regs[ 4] = ksig->sig;
225 regs->regs[ 5] = (unsigned long) &frame->rs_info;
226 regs->regs[ 6] = (unsigned long) &frame->rs_uc;
227 regs->regs[29] = (unsigned long) frame;
228 regs->regs[31] = (unsigned long) sig_return;
229 regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler;
231 DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
232 current->comm, current->pid,
233 frame, regs->cp0_epc, regs->regs[31]);
239 * o32 compatibility on 64-bit kernels, without DSP ASE
241 struct mips_abi mips_abi_32 = {
242 .setup_frame = setup_frame_32,
243 .setup_rt_frame = setup_rt_frame_32,
244 .restart = __NR_O32_restart_syscall,
246 .off_sc_fpregs = offsetof(struct sigcontext32, sc_fpregs),
247 .off_sc_fpc_csr = offsetof(struct sigcontext32, sc_fpc_csr),
248 .off_sc_used_math = offsetof(struct sigcontext32, sc_used_math),
250 .vdso = &vdso_image_o32,
254 asmlinkage void sys32_sigreturn(nabi_no_regargs struct pt_regs regs)
256 struct sigframe32 __user *frame;
260 frame = (struct sigframe32 __user *) regs.regs[29];
261 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
263 if (__copy_conv_sigset_from_user(&blocked, &frame->sf_mask))
266 set_current_blocked(&blocked);
268 sig = restore_sigcontext32(®s, &frame->sf_sc);
272 force_sig(sig, current);
275 * Don't let your children do this ...
277 __asm__ __volatile__(
285 force_sig(SIGSEGV, current);