Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 1 | /* |
| 2 | * arch/score/kernel/signal.c |
| 3 | * |
| 4 | * Score Processor version. |
| 5 | * |
| 6 | * Copyright (C) 2009 Sunplus Core Technology Co., Ltd. |
| 7 | * Chen Liqin <liqin.chen@sunplusct.com> |
| 8 | * Lennox Wu <lennox.wu@sunplusct.com> |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | * GNU General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License |
| 21 | * along with this program; if not, see the file COPYING, or write |
| 22 | * to the Free Software Foundation, Inc., |
| 23 | * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 24 | */ |
| 25 | |
| 26 | #include <linux/errno.h> |
| 27 | #include <linux/signal.h> |
Chen Liqin | d8aa899 | 2009-08-30 12:26:32 +0800 | [diff] [blame] | 28 | #include <linux/ptrace.h> |
Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 29 | #include <linux/unistd.h> |
| 30 | #include <linux/uaccess.h> |
Al Viro | 1d5d4db | 2012-04-24 01:55:30 -0400 | [diff] [blame] | 31 | #include <linux/tracehook.h> |
Arnd Bergmann | 9fb24cc | 2009-06-27 14:50:51 +0200 | [diff] [blame] | 32 | |
Chen Liqin | d8aa899 | 2009-08-30 12:26:32 +0800 | [diff] [blame] | 33 | #include <asm/cacheflush.h> |
Arnd Bergmann | 9fb24cc | 2009-06-27 14:50:51 +0200 | [diff] [blame] | 34 | #include <asm/syscalls.h> |
| 35 | #include <asm/ucontext.h> |
Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 36 | |
Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 37 | struct rt_sigframe { |
| 38 | u32 rs_ass[4]; /* argument save space */ |
| 39 | u32 rs_code[2]; /* signal trampoline */ |
| 40 | struct siginfo rs_info; |
| 41 | struct ucontext rs_uc; |
| 42 | }; |
| 43 | |
Arnd Bergmann | bddc605 | 2009-06-27 15:12:16 +0200 | [diff] [blame] | 44 | static int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc) |
Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 45 | { |
| 46 | int err = 0; |
| 47 | unsigned long reg; |
| 48 | |
| 49 | reg = regs->cp0_epc; err |= __put_user(reg, &sc->sc_pc); |
| 50 | err |= __put_user(regs->cp0_psr, &sc->sc_psr); |
| 51 | err |= __put_user(regs->cp0_condition, &sc->sc_condition); |
| 52 | |
| 53 | |
| 54 | #define save_gp_reg(i) { \ |
| 55 | reg = regs->regs[i]; \ |
| 56 | err |= __put_user(reg, &sc->sc_regs[i]); \ |
| 57 | } while (0) |
| 58 | save_gp_reg(0); save_gp_reg(1); save_gp_reg(2); |
| 59 | save_gp_reg(3); save_gp_reg(4); save_gp_reg(5); |
| 60 | save_gp_reg(6); save_gp_reg(7); save_gp_reg(8); |
| 61 | save_gp_reg(9); save_gp_reg(10); save_gp_reg(11); |
| 62 | save_gp_reg(12); save_gp_reg(13); save_gp_reg(14); |
| 63 | save_gp_reg(15); save_gp_reg(16); save_gp_reg(17); |
| 64 | save_gp_reg(18); save_gp_reg(19); save_gp_reg(20); |
| 65 | save_gp_reg(21); save_gp_reg(22); save_gp_reg(23); |
| 66 | save_gp_reg(24); save_gp_reg(25); save_gp_reg(26); |
| 67 | save_gp_reg(27); save_gp_reg(28); save_gp_reg(29); |
| 68 | #undef save_gp_reg |
| 69 | |
| 70 | reg = regs->ceh; err |= __put_user(reg, &sc->sc_mdceh); |
| 71 | reg = regs->cel; err |= __put_user(reg, &sc->sc_mdcel); |
| 72 | err |= __put_user(regs->cp0_ecr, &sc->sc_ecr); |
| 73 | err |= __put_user(regs->cp0_ema, &sc->sc_ema); |
| 74 | |
| 75 | return err; |
| 76 | } |
| 77 | |
Arnd Bergmann | bddc605 | 2009-06-27 15:12:16 +0200 | [diff] [blame] | 78 | static int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc) |
Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 79 | { |
| 80 | int err = 0; |
| 81 | u32 reg; |
| 82 | |
| 83 | err |= __get_user(regs->cp0_epc, &sc->sc_pc); |
| 84 | err |= __get_user(regs->cp0_condition, &sc->sc_condition); |
| 85 | |
| 86 | err |= __get_user(reg, &sc->sc_mdceh); |
| 87 | regs->ceh = (int) reg; |
| 88 | err |= __get_user(reg, &sc->sc_mdcel); |
| 89 | regs->cel = (int) reg; |
| 90 | |
| 91 | err |= __get_user(reg, &sc->sc_psr); |
| 92 | regs->cp0_psr = (int) reg; |
| 93 | err |= __get_user(reg, &sc->sc_ecr); |
| 94 | regs->cp0_ecr = (int) reg; |
| 95 | err |= __get_user(reg, &sc->sc_ema); |
| 96 | regs->cp0_ema = (int) reg; |
| 97 | |
| 98 | #define restore_gp_reg(i) do { \ |
| 99 | err |= __get_user(reg, &sc->sc_regs[i]); \ |
| 100 | regs->regs[i] = reg; \ |
| 101 | } while (0) |
| 102 | restore_gp_reg(0); restore_gp_reg(1); restore_gp_reg(2); |
| 103 | restore_gp_reg(3); restore_gp_reg(4); restore_gp_reg(5); |
| 104 | restore_gp_reg(6); restore_gp_reg(7); restore_gp_reg(8); |
| 105 | restore_gp_reg(9); restore_gp_reg(10); restore_gp_reg(11); |
| 106 | restore_gp_reg(12); restore_gp_reg(13); restore_gp_reg(14); |
| 107 | restore_gp_reg(15); restore_gp_reg(16); restore_gp_reg(17); |
| 108 | restore_gp_reg(18); restore_gp_reg(19); restore_gp_reg(20); |
| 109 | restore_gp_reg(21); restore_gp_reg(22); restore_gp_reg(23); |
| 110 | restore_gp_reg(24); restore_gp_reg(25); restore_gp_reg(26); |
| 111 | restore_gp_reg(27); restore_gp_reg(28); restore_gp_reg(29); |
| 112 | #undef restore_gp_reg |
| 113 | |
| 114 | return err; |
| 115 | } |
| 116 | |
| 117 | /* |
| 118 | * Determine which stack to use.. |
| 119 | */ |
Arnd Bergmann | bddc605 | 2009-06-27 15:12:16 +0200 | [diff] [blame] | 120 | static void __user *get_sigframe(struct k_sigaction *ka, |
| 121 | struct pt_regs *regs, size_t frame_size) |
Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 122 | { |
| 123 | unsigned long sp; |
| 124 | |
| 125 | /* Default to using normal stack */ |
| 126 | sp = regs->regs[0]; |
| 127 | sp -= 32; |
| 128 | |
| 129 | /* This is the X/Open sanctioned signal stack switching. */ |
| 130 | if ((ka->sa.sa_flags & SA_ONSTACK) && (!on_sig_stack(sp))) |
| 131 | sp = current->sas_ss_sp + current->sas_ss_size; |
| 132 | |
Arnd Bergmann | a1f8213 | 2009-06-27 15:05:30 +0200 | [diff] [blame] | 133 | return (void __user*)((sp - frame_size) & ~7); |
Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 134 | } |
| 135 | |
Arnd Bergmann | bddc605 | 2009-06-27 15:12:16 +0200 | [diff] [blame] | 136 | asmlinkage long |
Arnd Bergmann | bddc605 | 2009-06-27 15:12:16 +0200 | [diff] [blame] | 137 | score_rt_sigreturn(struct pt_regs *regs) |
Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 138 | { |
| 139 | struct rt_sigframe __user *frame; |
| 140 | sigset_t set; |
Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 141 | int sig; |
| 142 | |
Al Viro | f2ccfb3 | 2012-04-22 03:33:45 -0400 | [diff] [blame] | 143 | /* Always make any pending restarted system calls return -EINTR */ |
| 144 | current_thread_info()->restart_block.fn = do_no_restart_syscall; |
| 145 | |
Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 146 | frame = (struct rt_sigframe __user *) regs->regs[0]; |
| 147 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
| 148 | goto badframe; |
| 149 | if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set))) |
| 150 | goto badframe; |
| 151 | |
Matt Fleming | 4c3181b | 2012-05-11 10:58:05 +1000 | [diff] [blame] | 152 | set_current_blocked(&set); |
Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 153 | |
| 154 | sig = restore_sigcontext(regs, &frame->rs_uc.uc_mcontext); |
| 155 | if (sig < 0) |
| 156 | goto badframe; |
| 157 | else if (sig) |
| 158 | force_sig(sig, current); |
| 159 | |
Al Viro | b774cc5 | 2012-12-23 03:43:28 -0500 | [diff] [blame] | 160 | if (restore_altstack(&frame->rs_uc.uc_stack)) |
Al Viro | afd3f96 | 2012-11-20 10:36:17 -0500 | [diff] [blame] | 161 | goto badframe; |
Al Viro | af445f4 | 2012-04-30 23:37:41 -0400 | [diff] [blame] | 162 | regs->is_syscall = 0; |
Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 163 | |
| 164 | __asm__ __volatile__( |
| 165 | "mv\tr0, %0\n\t" |
| 166 | "la\tr8, syscall_exit\n\t" |
| 167 | "br\tr8\n\t" |
| 168 | : : "r" (regs) : "r8"); |
| 169 | |
| 170 | badframe: |
| 171 | force_sig(SIGSEGV, current); |
Arnd Bergmann | bddc605 | 2009-06-27 15:12:16 +0200 | [diff] [blame] | 172 | |
| 173 | return 0; |
Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 174 | } |
| 175 | |
Arnd Bergmann | bddc605 | 2009-06-27 15:12:16 +0200 | [diff] [blame] | 176 | static int setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs, |
Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 177 | int signr, sigset_t *set, siginfo_t *info) |
| 178 | { |
Arnd Bergmann | a1f8213 | 2009-06-27 15:05:30 +0200 | [diff] [blame] | 179 | struct rt_sigframe __user *frame; |
Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 180 | int err = 0; |
| 181 | |
| 182 | frame = get_sigframe(ka, regs, sizeof(*frame)); |
| 183 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) |
| 184 | goto give_sigsegv; |
| 185 | |
| 186 | /* |
| 187 | * Set up the return code ... |
| 188 | * |
| 189 | * li v0, __NR_rt_sigreturn |
| 190 | * syscall |
| 191 | */ |
| 192 | err |= __put_user(0x87788000 + __NR_rt_sigreturn*2, |
| 193 | frame->rs_code + 0); |
| 194 | err |= __put_user(0x80008002, frame->rs_code + 1); |
| 195 | flush_cache_sigtramp((unsigned long) frame->rs_code); |
| 196 | |
| 197 | err |= copy_siginfo_to_user(&frame->rs_info, info); |
| 198 | err |= __put_user(0, &frame->rs_uc.uc_flags); |
Arnd Bergmann | c606747 | 2009-06-27 14:46:35 +0200 | [diff] [blame] | 199 | err |= __put_user(NULL, &frame->rs_uc.uc_link); |
Al Viro | b774cc5 | 2012-12-23 03:43:28 -0500 | [diff] [blame] | 200 | err |= __save_altstack(&frame->rs_uc.uc_stack, regs->regs[0]); |
Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 201 | err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext); |
| 202 | err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set)); |
| 203 | |
| 204 | if (err) |
| 205 | goto give_sigsegv; |
| 206 | |
| 207 | regs->regs[0] = (unsigned long) frame; |
| 208 | regs->regs[3] = (unsigned long) frame->rs_code; |
| 209 | regs->regs[4] = signr; |
| 210 | regs->regs[5] = (unsigned long) &frame->rs_info; |
| 211 | regs->regs[6] = (unsigned long) &frame->rs_uc; |
| 212 | regs->regs[29] = (unsigned long) ka->sa.sa_handler; |
| 213 | regs->cp0_epc = (unsigned long) ka->sa.sa_handler; |
| 214 | |
| 215 | return 0; |
| 216 | |
| 217 | give_sigsegv: |
Al Viro | cf4a0ce | 2012-04-21 21:39:54 -0400 | [diff] [blame] | 218 | force_sigsegv(signr, current); |
Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 219 | return -EFAULT; |
| 220 | } |
| 221 | |
Al Viro | a610d6e | 2012-05-21 23:42:15 -0400 | [diff] [blame] | 222 | static void handle_signal(unsigned long sig, siginfo_t *info, |
Al Viro | b7f9a11 | 2012-05-02 09:59:21 -0400 | [diff] [blame] | 223 | struct k_sigaction *ka, struct pt_regs *regs) |
Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 224 | { |
Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 225 | if (regs->is_syscall) { |
| 226 | switch (regs->regs[4]) { |
| 227 | case ERESTART_RESTARTBLOCK: |
| 228 | case ERESTARTNOHAND: |
| 229 | regs->regs[4] = EINTR; |
| 230 | break; |
| 231 | case ERESTARTSYS: |
| 232 | if (!(ka->sa.sa_flags & SA_RESTART)) { |
| 233 | regs->regs[4] = EINTR; |
| 234 | break; |
| 235 | } |
| 236 | case ERESTARTNOINTR: |
| 237 | regs->regs[4] = regs->orig_r4; |
| 238 | regs->regs[7] = regs->orig_r7; |
| 239 | regs->cp0_epc -= 8; |
| 240 | } |
| 241 | |
| 242 | regs->is_syscall = 0; |
| 243 | } |
| 244 | |
| 245 | /* |
| 246 | * Set up the stack frame |
| 247 | */ |
Al Viro | a610d6e | 2012-05-21 23:42:15 -0400 | [diff] [blame] | 248 | if (setup_rt_frame(ka, regs, sig, sigmask_to_save(), info) < 0) |
| 249 | return; |
Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 250 | |
Al Viro | efee984 | 2012-04-28 02:04:15 -0400 | [diff] [blame] | 251 | signal_delivered(sig, info, ka, regs, 0); |
Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 252 | } |
| 253 | |
Arnd Bergmann | bddc605 | 2009-06-27 15:12:16 +0200 | [diff] [blame] | 254 | static void do_signal(struct pt_regs *regs) |
Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 255 | { |
| 256 | struct k_sigaction ka; |
Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 257 | siginfo_t info; |
| 258 | int signr; |
| 259 | |
| 260 | /* |
| 261 | * We want the common case to go fast, which is why we may in certain |
| 262 | * cases get here from kernel mode. Just return without doing anything |
| 263 | * if so. |
| 264 | */ |
| 265 | if (!user_mode(regs)) |
| 266 | return; |
| 267 | |
Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 268 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
| 269 | if (signr > 0) { |
| 270 | /* Actually deliver the signal. */ |
Al Viro | a610d6e | 2012-05-21 23:42:15 -0400 | [diff] [blame] | 271 | handle_signal(signr, &info, &ka, regs); |
Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 272 | return; |
| 273 | } |
| 274 | |
| 275 | if (regs->is_syscall) { |
| 276 | if (regs->regs[4] == ERESTARTNOHAND || |
| 277 | regs->regs[4] == ERESTARTSYS || |
| 278 | regs->regs[4] == ERESTARTNOINTR) { |
| 279 | regs->regs[4] = regs->orig_r4; |
| 280 | regs->regs[7] = regs->orig_r7; |
| 281 | regs->cp0_epc -= 8; |
| 282 | } |
| 283 | |
| 284 | if (regs->regs[4] == ERESTART_RESTARTBLOCK) { |
| 285 | regs->regs[27] = __NR_restart_syscall; |
| 286 | regs->regs[4] = regs->orig_r4; |
| 287 | regs->regs[7] = regs->orig_r7; |
| 288 | regs->cp0_epc -= 8; |
| 289 | } |
| 290 | |
| 291 | regs->is_syscall = 0; /* Don't deal with this again. */ |
| 292 | } |
| 293 | |
| 294 | /* |
| 295 | * If there's no signal to deliver, we just put the saved sigmask |
| 296 | * back |
| 297 | */ |
Al Viro | 51a7b44 | 2012-05-21 23:33:55 -0400 | [diff] [blame] | 298 | restore_saved_sigmask(); |
Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 299 | } |
| 300 | |
| 301 | /* |
| 302 | * notification of userspace execution resumption |
| 303 | * - triggered by the TIF_WORK_MASK flags |
| 304 | */ |
| 305 | asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused, |
| 306 | __u32 thread_info_flags) |
| 307 | { |
| 308 | /* deal with pending signal delivery */ |
Al Viro | 1d5d4db | 2012-04-24 01:55:30 -0400 | [diff] [blame] | 309 | if (thread_info_flags & _TIF_SIGPENDING) |
Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 310 | do_signal(regs); |
Al Viro | 1d5d4db | 2012-04-24 01:55:30 -0400 | [diff] [blame] | 311 | if (thread_info_flags & _TIF_NOTIFY_RESUME) { |
| 312 | clear_thread_flag(TIF_NOTIFY_RESUME); |
| 313 | tracehook_notify_resume(regs); |
Al Viro | 1d5d4db | 2012-04-24 01:55:30 -0400 | [diff] [blame] | 314 | } |
Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 315 | } |