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/uaccess.h>
17 #include <asm/compat-signal.h>
20 #include <asm/unistd.h>
22 #include "signal-common.h"
25 * Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
27 #define __NR_O32_restart_syscall 4253
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;
39 compat_stack_t uc_stack;
40 struct sigcontext32 uc_mcontext;
41 compat_sigset_t uc_sigmask; /* mask last for extensibility */
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;
51 static int setup_sigcontext32(struct pt_regs *regs,
52 struct sigcontext32 __user *sc)
57 err |= __put_user(regs->cp0_epc, &sc->sc_pc);
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]);
63 err |= __put_user(regs->hi, &sc->sc_mdhi);
64 err |= __put_user(regs->lo, &sc->sc_mdlo);
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);
76 * Save FPU state to signal context. Signal handler
77 * will "inherit" current FPU state.
79 err |= protected_save_fp_context(sc);
84 static int restore_sigcontext32(struct pt_regs *regs,
85 struct sigcontext32 __user *sc)
91 /* Always make any pending restarted system calls return -EINTR */
92 current->restart_block.fn = do_no_restart_syscall;
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);
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);
107 for (i = 1; i < 32; i++)
108 err |= __get_user(regs->regs[i], &sc->sc_regs[i]);
110 return err ?: protected_restore_fp_context(sc);
113 static int setup_frame_32(void *sig_return, struct ksignal *ksig,
114 struct pt_regs *regs, sigset_t *set)
116 struct sigframe32 __user *frame;
119 frame = get_sigframe(ksig, regs, sizeof(*frame));
120 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
123 err |= setup_sigcontext32(regs, &frame->sf_sc);
124 err |= __copy_conv_sigset_to_user(&frame->sf_mask, set);
130 * Arguments to signal handler:
133 * a1 = 0 (should be cause)
134 * a2 = pointer to struct sigcontext
136 * $25 and c0_epc point to the signal handler, $29 points to the
139 regs->regs[ 4] = ksig->sig;
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;
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]);
153 asmlinkage void sys32_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
155 struct rt_sigframe32 __user *frame;
159 frame = (struct rt_sigframe32 __user *) regs.regs[29];
160 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
162 if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask))
165 set_current_blocked(&set);
167 sig = restore_sigcontext32(®s, &frame->rs_uc.uc_mcontext);
171 force_sig(sig, current);
173 if (compat_restore_altstack(&frame->rs_uc.uc_stack))
177 * Don't let your children do this ...
179 __asm__ __volatile__(
187 force_sig(SIGSEGV, current);
190 static int setup_rt_frame_32(void *sig_return, struct ksignal *ksig,
191 struct pt_regs *regs, sigset_t *set)
193 struct rt_sigframe32 __user *frame;
196 frame = get_sigframe(ksig, regs, sizeof(*frame));
197 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
200 /* Convert (siginfo_t -> compat_siginfo_t) and copy to user. */
201 err |= copy_siginfo_to_user32(&frame->rs_info, &ksig->info);
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);
214 * Arguments to signal handler:
217 * a1 = 0 (should be cause)
218 * a2 = pointer to ucontext
220 * $25 and c0_epc point to the signal handler, $29 points to
221 * the struct rt_sigframe32.
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;
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]);
238 * o32 compatibility on 64-bit kernels, without DSP ASE
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,
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),
249 .vdso = &vdso_image_o32,
253 asmlinkage void sys32_sigreturn(nabi_no_regargs struct pt_regs regs)
255 struct sigframe32 __user *frame;
259 frame = (struct sigframe32 __user *) regs.regs[29];
260 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
262 if (__copy_conv_sigset_from_user(&blocked, &frame->sf_mask))
265 set_current_blocked(&blocked);
267 sig = restore_sigcontext32(®s, &frame->sf_sc);
271 force_sig(sig, current);
274 * Don't let your children do this ...
276 __asm__ __volatile__(
284 force_sig(SIGSEGV, current);