Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/parisc/kernel/signal.c: Architecture-specific signal |
| 3 | * handling support. |
| 4 | * |
| 5 | * Copyright (C) 2000 David Huggins-Daines <dhd@debian.org> |
| 6 | * Copyright (C) 2000 Linuxcare, Inc. |
| 7 | * |
| 8 | * Based on the ia64, i386, and alpha versions. |
| 9 | * |
| 10 | * Like the IA-64, we are a recent enough port (we are *starting* |
| 11 | * with glibc2.2) that we do not need to support the old non-realtime |
| 12 | * Linux signals. Therefore we don't. HP/UX signals will go in |
| 13 | * arch/parisc/hpux/signal.c when we figure out how to do them. |
| 14 | */ |
| 15 | |
| 16 | #include <linux/sched.h> |
| 17 | #include <linux/mm.h> |
| 18 | #include <linux/smp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/kernel.h> |
| 20 | #include <linux/signal.h> |
| 21 | #include <linux/errno.h> |
| 22 | #include <linux/wait.h> |
| 23 | #include <linux/ptrace.h> |
| 24 | #include <linux/unistd.h> |
| 25 | #include <linux/stddef.h> |
| 26 | #include <linux/compat.h> |
| 27 | #include <linux/elf.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <asm/ucontext.h> |
| 29 | #include <asm/rt_sigframe.h> |
| 30 | #include <asm/uaccess.h> |
| 31 | #include <asm/pgalloc.h> |
| 32 | #include <asm/cacheflush.h> |
Sam Ravnborg | 0013a85 | 2005-09-09 20:57:26 +0200 | [diff] [blame] | 33 | #include <asm/asm-offsets.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | |
| 35 | #ifdef CONFIG_COMPAT |
| 36 | #include <linux/compat.h> |
| 37 | #include "signal32.h" |
| 38 | #endif |
| 39 | |
| 40 | #define DEBUG_SIG 0 |
| 41 | #define DEBUG_SIG_LEVEL 2 |
| 42 | |
| 43 | #if DEBUG_SIG |
| 44 | #define DBG(LEVEL, ...) \ |
| 45 | ((DEBUG_SIG_LEVEL >= LEVEL) \ |
| 46 | ? printk(__VA_ARGS__) : (void) 0) |
| 47 | #else |
| 48 | #define DBG(LEVEL, ...) |
| 49 | #endif |
| 50 | |
| 51 | |
| 52 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) |
| 53 | |
| 54 | /* gcc will complain if a pointer is cast to an integer of different |
| 55 | * size. If you really need to do this (and we do for an ELF32 user |
| 56 | * application in an ELF64 kernel) then you have to do a cast to an |
| 57 | * integer of the same size first. The A() macro accomplishes |
| 58 | * this. */ |
| 59 | #define A(__x) ((unsigned long)(__x)) |
| 60 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | /* |
| 62 | * Atomically swap in the new signal mask, and wait for a signal. |
| 63 | */ |
Helge Deller | a8f44e3 | 2007-01-28 14:58:52 +0100 | [diff] [blame] | 64 | #ifdef CONFIG_64BIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | #include "sys32.h" |
| 66 | #endif |
| 67 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | /* |
| 69 | * Do a signal return - restore sigcontext. |
| 70 | */ |
| 71 | |
| 72 | /* Trampoline for calling rt_sigreturn() */ |
| 73 | #define INSN_LDI_R25_0 0x34190000 /* ldi 0,%r25 (in_syscall=0) */ |
| 74 | #define INSN_LDI_R25_1 0x34190002 /* ldi 1,%r25 (in_syscall=1) */ |
| 75 | #define INSN_LDI_R20 0x3414015a /* ldi __NR_rt_sigreturn,%r20 */ |
| 76 | #define INSN_BLE_SR2_R0 0xe4008200 /* be,l 0x100(%sr2,%r0),%sr0,%r31 */ |
| 77 | #define INSN_NOP 0x08000240 /* nop */ |
| 78 | /* For debugging */ |
| 79 | #define INSN_DIE_HORRIBLY 0x68000ccc /* stw %r0,0x666(%sr0,%r0) */ |
| 80 | |
| 81 | static long |
| 82 | restore_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs) |
| 83 | { |
| 84 | long err = 0; |
| 85 | |
| 86 | err |= __copy_from_user(regs->gr, sc->sc_gr, sizeof(regs->gr)); |
| 87 | err |= __copy_from_user(regs->fr, sc->sc_fr, sizeof(regs->fr)); |
| 88 | err |= __copy_from_user(regs->iaoq, sc->sc_iaoq, sizeof(regs->iaoq)); |
| 89 | err |= __copy_from_user(regs->iasq, sc->sc_iasq, sizeof(regs->iasq)); |
| 90 | err |= __get_user(regs->sar, &sc->sc_sar); |
| 91 | DBG(2,"restore_sigcontext: iaoq is 0x%#lx / 0x%#lx\n", |
| 92 | regs->iaoq[0],regs->iaoq[1]); |
| 93 | DBG(2,"restore_sigcontext: r28 is %ld\n", regs->gr[28]); |
| 94 | return err; |
| 95 | } |
| 96 | |
| 97 | void |
| 98 | sys_rt_sigreturn(struct pt_regs *regs, int in_syscall) |
| 99 | { |
| 100 | struct rt_sigframe __user *frame; |
| 101 | struct siginfo si; |
| 102 | sigset_t set; |
| 103 | unsigned long usp = (regs->gr[30] & ~(0x01UL)); |
| 104 | unsigned long sigframe_size = PARISC_RT_SIGFRAME_SIZE; |
Helge Deller | a8f44e3 | 2007-01-28 14:58:52 +0100 | [diff] [blame] | 105 | #ifdef CONFIG_64BIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | compat_sigset_t compat_set; |
| 107 | struct compat_rt_sigframe __user * compat_frame; |
| 108 | |
Kyle McMartin | a3ea84f | 2006-06-16 19:10:02 +0000 | [diff] [blame] | 109 | if (is_compat_task()) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | sigframe_size = PARISC_RT_SIGFRAME_SIZE32; |
| 111 | #endif |
| 112 | |
| 113 | |
| 114 | /* Unwind the user stack to get the rt_sigframe structure. */ |
| 115 | frame = (struct rt_sigframe __user *) |
| 116 | (usp - sigframe_size); |
| 117 | DBG(2,"sys_rt_sigreturn: frame is %p\n", frame); |
| 118 | |
Helge Deller | a8f44e3 | 2007-01-28 14:58:52 +0100 | [diff] [blame] | 119 | #ifdef CONFIG_64BIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | compat_frame = (struct compat_rt_sigframe __user *)frame; |
| 121 | |
Kyle McMartin | a3ea84f | 2006-06-16 19:10:02 +0000 | [diff] [blame] | 122 | if (is_compat_task()) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | DBG(2,"sys_rt_sigreturn: ELF32 process.\n"); |
| 124 | if (__copy_from_user(&compat_set, &compat_frame->uc.uc_sigmask, sizeof(compat_set))) |
| 125 | goto give_sigsegv; |
| 126 | sigset_32to64(&set,&compat_set); |
| 127 | } else |
| 128 | #endif |
| 129 | { |
| 130 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) |
| 131 | goto give_sigsegv; |
| 132 | } |
| 133 | |
| 134 | sigdelsetmask(&set, ~_BLOCKABLE); |
| 135 | spin_lock_irq(¤t->sighand->siglock); |
| 136 | current->blocked = set; |
| 137 | recalc_sigpending(); |
| 138 | spin_unlock_irq(¤t->sighand->siglock); |
| 139 | |
| 140 | /* Good thing we saved the old gr[30], eh? */ |
Helge Deller | a8f44e3 | 2007-01-28 14:58:52 +0100 | [diff] [blame] | 141 | #ifdef CONFIG_64BIT |
Kyle McMartin | a3ea84f | 2006-06-16 19:10:02 +0000 | [diff] [blame] | 142 | if (is_compat_task()) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | DBG(1,"sys_rt_sigreturn: compat_frame->uc.uc_mcontext 0x%p\n", |
| 144 | &compat_frame->uc.uc_mcontext); |
| 145 | // FIXME: Load upper half from register file |
| 146 | if (restore_sigcontext32(&compat_frame->uc.uc_mcontext, |
| 147 | &compat_frame->regs, regs)) |
| 148 | goto give_sigsegv; |
| 149 | DBG(1,"sys_rt_sigreturn: usp %#08lx stack 0x%p\n", |
| 150 | usp, &compat_frame->uc.uc_stack); |
| 151 | if (do_sigaltstack32(&compat_frame->uc.uc_stack, NULL, usp) == -EFAULT) |
| 152 | goto give_sigsegv; |
| 153 | } else |
| 154 | #endif |
| 155 | { |
| 156 | DBG(1,"sys_rt_sigreturn: frame->uc.uc_mcontext 0x%p\n", |
| 157 | &frame->uc.uc_mcontext); |
| 158 | if (restore_sigcontext(&frame->uc.uc_mcontext, regs)) |
| 159 | goto give_sigsegv; |
| 160 | DBG(1,"sys_rt_sigreturn: usp %#08lx stack 0x%p\n", |
| 161 | usp, &frame->uc.uc_stack); |
| 162 | if (do_sigaltstack(&frame->uc.uc_stack, NULL, usp) == -EFAULT) |
| 163 | goto give_sigsegv; |
| 164 | } |
| 165 | |
| 166 | |
| 167 | |
| 168 | /* If we are on the syscall path IAOQ will not be restored, and |
| 169 | * if we are on the interrupt path we must not corrupt gr31. |
| 170 | */ |
| 171 | if (in_syscall) |
| 172 | regs->gr[31] = regs->iaoq[0]; |
| 173 | #if DEBUG_SIG |
| 174 | DBG(1,"sys_rt_sigreturn: returning to %#lx, DUMPING REGS:\n", regs->iaoq[0]); |
| 175 | show_regs(regs); |
| 176 | #endif |
| 177 | return; |
| 178 | |
| 179 | give_sigsegv: |
| 180 | DBG(1,"sys_rt_sigreturn: Sending SIGSEGV\n"); |
| 181 | si.si_signo = SIGSEGV; |
| 182 | si.si_errno = 0; |
| 183 | si.si_code = SI_KERNEL; |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 184 | si.si_pid = task_pid_vnr(current); |
David Howells | 25e1573 | 2008-11-14 10:38:38 +1100 | [diff] [blame] | 185 | si.si_uid = current_uid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | si.si_addr = &frame->uc; |
| 187 | force_sig_info(SIGSEGV, &si, current); |
| 188 | return; |
| 189 | } |
| 190 | |
| 191 | /* |
| 192 | * Set up a signal frame. |
| 193 | */ |
| 194 | |
| 195 | static inline void __user * |
| 196 | get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size) |
| 197 | { |
| 198 | /*FIXME: ELF32 vs. ELF64 has different frame_size, but since we |
| 199 | don't use the parameter it doesn't matter */ |
| 200 | |
| 201 | DBG(1,"get_sigframe: ka = %#lx, sp = %#lx, frame_size = %#lx\n", |
| 202 | (unsigned long)ka, sp, frame_size); |
| 203 | |
Laurent MEYER | d09042d | 2006-06-23 02:05:36 -0700 | [diff] [blame] | 204 | if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! sas_ss_flags(sp)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | sp = current->sas_ss_sp; /* Stacks grow up! */ |
| 206 | |
| 207 | DBG(1,"get_sigframe: Returning sp = %#lx\n", (unsigned long)sp); |
| 208 | return (void __user *) sp; /* Stacks grow up. Fun. */ |
| 209 | } |
| 210 | |
| 211 | static long |
| 212 | setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, int in_syscall) |
| 213 | |
| 214 | { |
| 215 | unsigned long flags = 0; |
| 216 | long err = 0; |
| 217 | |
| 218 | if (on_sig_stack((unsigned long) sc)) |
| 219 | flags |= PARISC_SC_FLAG_ONSTACK; |
| 220 | if (in_syscall) { |
| 221 | flags |= PARISC_SC_FLAG_IN_SYSCALL; |
| 222 | /* regs->iaoq is undefined in the syscall return path */ |
| 223 | err |= __put_user(regs->gr[31], &sc->sc_iaoq[0]); |
| 224 | err |= __put_user(regs->gr[31]+4, &sc->sc_iaoq[1]); |
| 225 | err |= __put_user(regs->sr[3], &sc->sc_iasq[0]); |
| 226 | err |= __put_user(regs->sr[3], &sc->sc_iasq[1]); |
| 227 | DBG(1,"setup_sigcontext: iaoq %#lx / %#lx (in syscall)\n", |
| 228 | regs->gr[31], regs->gr[31]+4); |
| 229 | } else { |
| 230 | err |= __copy_to_user(sc->sc_iaoq, regs->iaoq, sizeof(regs->iaoq)); |
| 231 | err |= __copy_to_user(sc->sc_iasq, regs->iasq, sizeof(regs->iasq)); |
| 232 | DBG(1,"setup_sigcontext: iaoq %#lx / %#lx (not in syscall)\n", |
| 233 | regs->iaoq[0], regs->iaoq[1]); |
| 234 | } |
| 235 | |
| 236 | err |= __put_user(flags, &sc->sc_flags); |
| 237 | err |= __copy_to_user(sc->sc_gr, regs->gr, sizeof(regs->gr)); |
| 238 | err |= __copy_to_user(sc->sc_fr, regs->fr, sizeof(regs->fr)); |
| 239 | err |= __put_user(regs->sar, &sc->sc_sar); |
| 240 | DBG(1,"setup_sigcontext: r28 is %ld\n", regs->gr[28]); |
| 241 | |
| 242 | return err; |
| 243 | } |
| 244 | |
| 245 | static long |
| 246 | setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
| 247 | sigset_t *set, struct pt_regs *regs, int in_syscall) |
| 248 | { |
| 249 | struct rt_sigframe __user *frame; |
| 250 | unsigned long rp, usp; |
| 251 | unsigned long haddr, sigframe_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | int err = 0; |
Helge Deller | a8f44e3 | 2007-01-28 14:58:52 +0100 | [diff] [blame] | 253 | #ifdef CONFIG_64BIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | compat_int_t compat_val; |
| 255 | struct compat_rt_sigframe __user * compat_frame; |
| 256 | compat_sigset_t compat_set; |
| 257 | #endif |
| 258 | |
| 259 | usp = (regs->gr[30] & ~(0x01UL)); |
| 260 | /*FIXME: frame_size parameter is unused, remove it. */ |
| 261 | frame = get_sigframe(ka, usp, sizeof(*frame)); |
| 262 | |
| 263 | DBG(1,"SETUP_RT_FRAME: START\n"); |
| 264 | DBG(1,"setup_rt_frame: frame %p info %p\n", frame, info); |
| 265 | |
| 266 | |
Helge Deller | a8f44e3 | 2007-01-28 14:58:52 +0100 | [diff] [blame] | 267 | #ifdef CONFIG_64BIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | |
| 269 | compat_frame = (struct compat_rt_sigframe __user *)frame; |
| 270 | |
Kyle McMartin | a3ea84f | 2006-06-16 19:10:02 +0000 | [diff] [blame] | 271 | if (is_compat_task()) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | DBG(1,"setup_rt_frame: frame->info = 0x%p\n", &compat_frame->info); |
Kyle McMartin | f671c45 | 2006-01-15 14:10:29 -0500 | [diff] [blame] | 273 | err |= copy_siginfo_to_user32(&compat_frame->info, info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | DBG(1,"SETUP_RT_FRAME: 1\n"); |
| 275 | compat_val = (compat_int_t)current->sas_ss_sp; |
| 276 | err |= __put_user(compat_val, &compat_frame->uc.uc_stack.ss_sp); |
| 277 | DBG(1,"SETUP_RT_FRAME: 2\n"); |
| 278 | compat_val = (compat_int_t)current->sas_ss_size; |
| 279 | err |= __put_user(compat_val, &compat_frame->uc.uc_stack.ss_size); |
| 280 | DBG(1,"SETUP_RT_FRAME: 3\n"); |
| 281 | compat_val = sas_ss_flags(regs->gr[30]); |
| 282 | err |= __put_user(compat_val, &compat_frame->uc.uc_stack.ss_flags); |
| 283 | DBG(1,"setup_rt_frame: frame->uc = 0x%p\n", &compat_frame->uc); |
| 284 | DBG(1,"setup_rt_frame: frame->uc.uc_mcontext = 0x%p\n", &compat_frame->uc.uc_mcontext); |
| 285 | err |= setup_sigcontext32(&compat_frame->uc.uc_mcontext, |
| 286 | &compat_frame->regs, regs, in_syscall); |
| 287 | sigset_64to32(&compat_set,set); |
| 288 | err |= __copy_to_user(&compat_frame->uc.uc_sigmask, &compat_set, sizeof(compat_set)); |
| 289 | } else |
| 290 | #endif |
| 291 | { |
| 292 | DBG(1,"setup_rt_frame: frame->info = 0x%p\n", &frame->info); |
| 293 | err |= copy_siginfo_to_user(&frame->info, info); |
| 294 | err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp); |
| 295 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); |
| 296 | err |= __put_user(sas_ss_flags(regs->gr[30]), |
| 297 | &frame->uc.uc_stack.ss_flags); |
| 298 | DBG(1,"setup_rt_frame: frame->uc = 0x%p\n", &frame->uc); |
| 299 | DBG(1,"setup_rt_frame: frame->uc.uc_mcontext = 0x%p\n", &frame->uc.uc_mcontext); |
| 300 | err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, in_syscall); |
| 301 | /* FIXME: Should probably be converted aswell for the compat case */ |
| 302 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); |
| 303 | } |
| 304 | |
| 305 | if (err) |
| 306 | goto give_sigsegv; |
| 307 | |
| 308 | /* Set up to return from userspace. If provided, use a stub |
| 309 | already in userspace. The first words of tramp are used to |
| 310 | save the previous sigrestartblock trampoline that might be |
| 311 | on the stack. We start the sigreturn trampoline at |
| 312 | SIGRESTARTBLOCK_TRAMP+X. */ |
| 313 | err |= __put_user(in_syscall ? INSN_LDI_R25_1 : INSN_LDI_R25_0, |
| 314 | &frame->tramp[SIGRESTARTBLOCK_TRAMP+0]); |
| 315 | err |= __put_user(INSN_LDI_R20, |
| 316 | &frame->tramp[SIGRESTARTBLOCK_TRAMP+1]); |
| 317 | err |= __put_user(INSN_BLE_SR2_R0, |
| 318 | &frame->tramp[SIGRESTARTBLOCK_TRAMP+2]); |
| 319 | err |= __put_user(INSN_NOP, &frame->tramp[SIGRESTARTBLOCK_TRAMP+3]); |
| 320 | |
| 321 | #if DEBUG_SIG |
| 322 | /* Assert that we're flushing in the correct space... */ |
| 323 | { |
| 324 | int sid; |
| 325 | asm ("mfsp %%sr3,%0" : "=r" (sid)); |
| 326 | DBG(1,"setup_rt_frame: Flushing 64 bytes at space %#x offset %p\n", |
| 327 | sid, frame->tramp); |
| 328 | } |
| 329 | #endif |
| 330 | |
| 331 | flush_user_dcache_range((unsigned long) &frame->tramp[0], |
| 332 | (unsigned long) &frame->tramp[TRAMP_SIZE]); |
| 333 | flush_user_icache_range((unsigned long) &frame->tramp[0], |
| 334 | (unsigned long) &frame->tramp[TRAMP_SIZE]); |
| 335 | |
Paulius Zaleckas | efad798b | 2008-02-03 15:42:53 +0200 | [diff] [blame] | 336 | /* TRAMP Words 0-4, Length 5 = SIGRESTARTBLOCK_TRAMP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | * TRAMP Words 5-9, Length 4 = SIGRETURN_TRAMP |
| 338 | * So the SIGRETURN_TRAMP is at the end of SIGRESTARTBLOCK_TRAMP |
| 339 | */ |
| 340 | rp = (unsigned long) &frame->tramp[SIGRESTARTBLOCK_TRAMP]; |
| 341 | |
| 342 | if (err) |
| 343 | goto give_sigsegv; |
| 344 | |
| 345 | haddr = A(ka->sa.sa_handler); |
| 346 | /* The sa_handler may be a pointer to a function descriptor */ |
Helge Deller | a8f44e3 | 2007-01-28 14:58:52 +0100 | [diff] [blame] | 347 | #ifdef CONFIG_64BIT |
Kyle McMartin | a3ea84f | 2006-06-16 19:10:02 +0000 | [diff] [blame] | 348 | if (is_compat_task()) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | #endif |
| 350 | if (haddr & PA_PLABEL_FDESC) { |
| 351 | Elf32_Fdesc fdesc; |
| 352 | Elf32_Fdesc __user *ufdesc = (Elf32_Fdesc __user *)A(haddr & ~3); |
| 353 | |
| 354 | err = __copy_from_user(&fdesc, ufdesc, sizeof(fdesc)); |
| 355 | |
| 356 | if (err) |
| 357 | goto give_sigsegv; |
| 358 | |
| 359 | haddr = fdesc.addr; |
| 360 | regs->gr[19] = fdesc.gp; |
| 361 | } |
Helge Deller | a8f44e3 | 2007-01-28 14:58:52 +0100 | [diff] [blame] | 362 | #ifdef CONFIG_64BIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | } else { |
| 364 | Elf64_Fdesc fdesc; |
| 365 | Elf64_Fdesc __user *ufdesc = (Elf64_Fdesc __user *)A(haddr & ~3); |
| 366 | |
| 367 | err = __copy_from_user(&fdesc, ufdesc, sizeof(fdesc)); |
| 368 | |
| 369 | if (err) |
| 370 | goto give_sigsegv; |
| 371 | |
| 372 | haddr = fdesc.addr; |
| 373 | regs->gr[19] = fdesc.gp; |
| 374 | DBG(1,"setup_rt_frame: 64 bit signal, exe=%#lx, r19=%#lx, in_syscall=%d\n", |
| 375 | haddr, regs->gr[19], in_syscall); |
| 376 | } |
| 377 | #endif |
| 378 | |
| 379 | /* The syscall return path will create IAOQ values from r31. |
| 380 | */ |
| 381 | sigframe_size = PARISC_RT_SIGFRAME_SIZE; |
Helge Deller | a8f44e3 | 2007-01-28 14:58:52 +0100 | [diff] [blame] | 382 | #ifdef CONFIG_64BIT |
Kyle McMartin | a3ea84f | 2006-06-16 19:10:02 +0000 | [diff] [blame] | 383 | if (is_compat_task()) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | sigframe_size = PARISC_RT_SIGFRAME_SIZE32; |
| 385 | #endif |
| 386 | if (in_syscall) { |
| 387 | regs->gr[31] = haddr; |
Helge Deller | a8f44e3 | 2007-01-28 14:58:52 +0100 | [diff] [blame] | 388 | #ifdef CONFIG_64BIT |
Kyle McMartin | df570b9 | 2006-08-27 11:04:26 -0400 | [diff] [blame] | 389 | if (!test_thread_flag(TIF_32BIT)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | sigframe_size |= 1; |
| 391 | #endif |
| 392 | } else { |
| 393 | unsigned long psw = USER_PSW; |
Helge Deller | a8f44e3 | 2007-01-28 14:58:52 +0100 | [diff] [blame] | 394 | #ifdef CONFIG_64BIT |
Kyle McMartin | df570b9 | 2006-08-27 11:04:26 -0400 | [diff] [blame] | 395 | if (!test_thread_flag(TIF_32BIT)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | psw |= PSW_W; |
| 397 | #endif |
| 398 | |
| 399 | /* If we are singlestepping, arrange a trap to be delivered |
| 400 | when we return to userspace. Note the semantics -- we |
| 401 | should trap before the first insn in the handler is |
| 402 | executed. Ref: |
| 403 | http://sources.redhat.com/ml/gdb/2004-11/msg00245.html |
| 404 | */ |
| 405 | if (pa_psw(current)->r) { |
| 406 | pa_psw(current)->r = 0; |
| 407 | psw |= PSW_R; |
| 408 | mtctl(-1, 0); |
| 409 | } |
| 410 | |
| 411 | regs->gr[0] = psw; |
| 412 | regs->iaoq[0] = haddr | 3; |
| 413 | regs->iaoq[1] = regs->iaoq[0] + 4; |
| 414 | } |
| 415 | |
| 416 | regs->gr[2] = rp; /* userland return pointer */ |
| 417 | regs->gr[26] = sig; /* signal number */ |
| 418 | |
Helge Deller | a8f44e3 | 2007-01-28 14:58:52 +0100 | [diff] [blame] | 419 | #ifdef CONFIG_64BIT |
Kyle McMartin | a3ea84f | 2006-06-16 19:10:02 +0000 | [diff] [blame] | 420 | if (is_compat_task()) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | regs->gr[25] = A(&compat_frame->info); /* siginfo pointer */ |
| 422 | regs->gr[24] = A(&compat_frame->uc); /* ucontext pointer */ |
| 423 | } else |
| 424 | #endif |
| 425 | { |
| 426 | regs->gr[25] = A(&frame->info); /* siginfo pointer */ |
| 427 | regs->gr[24] = A(&frame->uc); /* ucontext pointer */ |
| 428 | } |
| 429 | |
| 430 | DBG(1,"setup_rt_frame: making sigreturn frame: %#lx + %#lx = %#lx\n", |
| 431 | regs->gr[30], sigframe_size, |
| 432 | regs->gr[30] + sigframe_size); |
| 433 | /* Raise the user stack pointer to make a proper call frame. */ |
| 434 | regs->gr[30] = (A(frame) + sigframe_size); |
| 435 | |
| 436 | |
| 437 | DBG(1,"setup_rt_frame: sig deliver (%s,%d) frame=0x%p sp=%#lx iaoq=%#lx/%#lx rp=%#lx\n", |
| 438 | current->comm, current->pid, frame, regs->gr[30], |
| 439 | regs->iaoq[0], regs->iaoq[1], rp); |
| 440 | |
| 441 | return 1; |
| 442 | |
| 443 | give_sigsegv: |
| 444 | DBG(1,"setup_rt_frame: sending SIGSEGV\n"); |
Randolph Chung | 40c72f2 | 2005-10-21 22:49:47 -0400 | [diff] [blame] | 445 | force_sigsegv(sig, current); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | return 0; |
| 447 | } |
| 448 | |
| 449 | /* |
| 450 | * OK, we're invoking a handler. |
| 451 | */ |
| 452 | |
| 453 | static long |
| 454 | handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka, |
| 455 | sigset_t *oldset, struct pt_regs *regs, int in_syscall) |
| 456 | { |
| 457 | DBG(1,"handle_signal: sig=%ld, ka=%p, info=%p, oldset=%p, regs=%p\n", |
| 458 | sig, ka, info, oldset, regs); |
| 459 | |
| 460 | /* Set up the stack frame */ |
| 461 | if (!setup_rt_frame(sig, ka, info, oldset, regs, in_syscall)) |
| 462 | return 0; |
| 463 | |
Steven Rostedt | 69be8f1 | 2005-08-29 11:44:09 -0400 | [diff] [blame] | 464 | spin_lock_irq(¤t->sighand->siglock); |
| 465 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); |
| 466 | if (!(ka->sa.sa_flags & SA_NODEFER)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | sigaddset(¤t->blocked,sig); |
Steven Rostedt | 69be8f1 | 2005-08-29 11:44:09 -0400 | [diff] [blame] | 468 | recalc_sigpending(); |
| 469 | spin_unlock_irq(¤t->sighand->siglock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | return 1; |
| 471 | } |
| 472 | |
Kyle McMartin | 2b163b7 | 2007-01-15 00:36:26 -0500 | [diff] [blame] | 473 | static inline void |
| 474 | syscall_restart(struct pt_regs *regs, struct k_sigaction *ka) |
| 475 | { |
| 476 | /* Check the return code */ |
| 477 | switch (regs->gr[28]) { |
| 478 | case -ERESTART_RESTARTBLOCK: |
| 479 | current_thread_info()->restart_block.fn = |
| 480 | do_no_restart_syscall; |
| 481 | case -ERESTARTNOHAND: |
| 482 | DBG(1,"ERESTARTNOHAND: returning -EINTR\n"); |
| 483 | regs->gr[28] = -EINTR; |
| 484 | break; |
| 485 | |
| 486 | case -ERESTARTSYS: |
| 487 | if (!(ka->sa.sa_flags & SA_RESTART)) { |
| 488 | DBG(1,"ERESTARTSYS: putting -EINTR\n"); |
| 489 | regs->gr[28] = -EINTR; |
| 490 | break; |
| 491 | } |
| 492 | /* fallthrough */ |
| 493 | case -ERESTARTNOINTR: |
| 494 | /* A syscall is just a branch, so all |
| 495 | * we have to do is fiddle the return pointer. |
| 496 | */ |
| 497 | regs->gr[31] -= 8; /* delayed branching */ |
| 498 | /* Preserve original r28. */ |
| 499 | regs->gr[28] = regs->orig_r28; |
| 500 | break; |
| 501 | } |
| 502 | } |
| 503 | |
| 504 | static inline void |
| 505 | insert_restart_trampoline(struct pt_regs *regs) |
| 506 | { |
| 507 | switch(regs->gr[28]) { |
| 508 | case -ERESTART_RESTARTBLOCK: { |
| 509 | /* Restart the system call - no handlers present */ |
| 510 | unsigned int *usp = (unsigned int *)regs->gr[30]; |
| 511 | |
| 512 | /* Setup a trampoline to restart the syscall |
| 513 | * with __NR_restart_syscall |
| 514 | * |
| 515 | * 0: <return address (orig r31)> |
| 516 | * 4: <2nd half for 64-bit> |
| 517 | * 8: ldw 0(%sp), %r31 |
| 518 | * 12: be 0x100(%sr2, %r0) |
| 519 | * 16: ldi __NR_restart_syscall, %r20 |
| 520 | */ |
| 521 | #ifdef CONFIG_64BIT |
| 522 | put_user(regs->gr[31] >> 32, &usp[0]); |
| 523 | put_user(regs->gr[31] & 0xffffffff, &usp[1]); |
| 524 | put_user(0x0fc010df, &usp[2]); |
| 525 | #else |
| 526 | put_user(regs->gr[31], &usp[0]); |
| 527 | put_user(0x0fc0109f, &usp[2]); |
| 528 | #endif |
| 529 | put_user(0xe0008200, &usp[3]); |
| 530 | put_user(0x34140000, &usp[4]); |
| 531 | |
| 532 | /* Stack is 64-byte aligned, and we only need |
| 533 | * to flush 1 cache line. |
| 534 | * Flushing one cacheline is cheap. |
| 535 | * "sync" on bigger (> 4 way) boxes is not. |
| 536 | */ |
Kyle McMartin | cf39cc3 | 2008-04-15 18:36:38 -0400 | [diff] [blame] | 537 | flush_user_dcache_range(regs->gr[30], regs->gr[30] + 4); |
| 538 | flush_user_icache_range(regs->gr[30], regs->gr[30] + 4); |
Kyle McMartin | 2b163b7 | 2007-01-15 00:36:26 -0500 | [diff] [blame] | 539 | |
| 540 | regs->gr[31] = regs->gr[30] + 8; |
| 541 | /* Preserve original r28. */ |
| 542 | regs->gr[28] = regs->orig_r28; |
| 543 | |
| 544 | return; |
| 545 | } |
| 546 | case -ERESTARTNOHAND: |
| 547 | case -ERESTARTSYS: |
| 548 | case -ERESTARTNOINTR: { |
| 549 | /* Hooray for delayed branching. We don't |
| 550 | * have to restore %r20 (the system call |
| 551 | * number) because it gets loaded in the delay |
| 552 | * slot of the branch external instruction. |
| 553 | */ |
| 554 | regs->gr[31] -= 8; |
| 555 | /* Preserve original r28. */ |
| 556 | regs->gr[28] = regs->orig_r28; |
| 557 | |
| 558 | return; |
| 559 | } |
| 560 | default: |
| 561 | break; |
| 562 | } |
| 563 | } |
| 564 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | /* |
| 566 | * Note that 'init' is a special process: it doesn't get signals it doesn't |
| 567 | * want to handle. Thus you cannot kill init even with a SIGKILL even by |
| 568 | * mistake. |
| 569 | * |
| 570 | * We need to be able to restore the syscall arguments (r21-r26) to |
| 571 | * restart syscalls. Thus, the syscall path should save them in the |
| 572 | * pt_regs structure (it's okay to do so since they are caller-save |
| 573 | * registers). As noted below, the syscall number gets restored for |
| 574 | * us due to the magic of delayed branching. |
| 575 | */ |
Kyle McMartin | 4650f0a | 2007-01-08 16:28:06 -0500 | [diff] [blame] | 576 | asmlinkage void |
| 577 | do_signal(struct pt_regs *regs, long in_syscall) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | { |
| 579 | siginfo_t info; |
| 580 | struct k_sigaction ka; |
| 581 | int signr; |
Kyle McMartin | 4650f0a | 2007-01-08 16:28:06 -0500 | [diff] [blame] | 582 | sigset_t *oldset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | |
| 584 | DBG(1,"\ndo_signal: oldset=0x%p, regs=0x%p, sr7 %#lx, in_syscall=%d\n", |
| 585 | oldset, regs, regs->sr[7], in_syscall); |
| 586 | |
| 587 | /* Everyone else checks to see if they are in kernel mode at |
| 588 | this point and exits if that's the case. I'm not sure why |
| 589 | we would be called in that case, but for some reason we |
| 590 | are. */ |
| 591 | |
Kyle McMartin | 4650f0a | 2007-01-08 16:28:06 -0500 | [diff] [blame] | 592 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
| 593 | oldset = ¤t->saved_sigmask; |
| 594 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | oldset = ¤t->blocked; |
| 596 | |
| 597 | DBG(1,"do_signal: oldset %08lx / %08lx\n", |
| 598 | oldset->sig[0], oldset->sig[1]); |
| 599 | |
| 600 | |
| 601 | /* May need to force signal if handle_signal failed to deliver */ |
| 602 | while (1) { |
| 603 | |
| 604 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
| 605 | DBG(3,"do_signal: signr = %d, regs->gr[28] = %ld\n", signr, regs->gr[28]); |
| 606 | |
| 607 | if (signr <= 0) |
| 608 | break; |
| 609 | |
| 610 | /* Restart a system call if necessary. */ |
Kyle McMartin | 2b163b7 | 2007-01-15 00:36:26 -0500 | [diff] [blame] | 611 | if (in_syscall) |
| 612 | syscall_restart(regs, &ka); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | /* Whee! Actually deliver the signal. If the |
| 615 | delivery failed, we need to continue to iterate in |
| 616 | this loop so we can deliver the SIGSEGV... */ |
Kyle McMartin | 2b163b7 | 2007-01-15 00:36:26 -0500 | [diff] [blame] | 617 | if (handle_signal(signr, &info, &ka, oldset, |
| 618 | regs, in_syscall)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | DBG(1,KERN_DEBUG "do_signal: Exit (success), regs->gr[28] = %ld\n", |
| 620 | regs->gr[28]); |
Kyle McMartin | 4650f0a | 2007-01-08 16:28:06 -0500 | [diff] [blame] | 621 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
| 622 | clear_thread_flag(TIF_RESTORE_SIGMASK); |
| 623 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | } |
| 625 | } |
| 626 | /* end of while(1) looping forever if we can't force a signal */ |
| 627 | |
| 628 | /* Did we come from a system call? */ |
Kyle McMartin | 2b163b7 | 2007-01-15 00:36:26 -0500 | [diff] [blame] | 629 | if (in_syscall) |
| 630 | insert_restart_trampoline(regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | |
| 632 | DBG(1,"do_signal: Exit (not delivered), regs->gr[28] = %ld\n", |
| 633 | regs->gr[28]); |
| 634 | |
Kyle McMartin | 4650f0a | 2007-01-08 16:28:06 -0500 | [diff] [blame] | 635 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) { |
| 636 | clear_thread_flag(TIF_RESTORE_SIGMASK); |
| 637 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); |
| 638 | } |
| 639 | |
| 640 | return; |
| 641 | } |
| 642 | |
| 643 | void do_notify_resume(struct pt_regs *regs, long in_syscall) |
| 644 | { |
| 645 | if (test_thread_flag(TIF_SIGPENDING) || |
| 646 | test_thread_flag(TIF_RESTORE_SIGMASK)) |
| 647 | do_signal(regs, in_syscall); |
David Howells | d0420c8 | 2009-09-02 09:14:16 +0100 | [diff] [blame^] | 648 | |
| 649 | if (test_thread_flag(TIF_NOTIFY_RESUME)) { |
| 650 | clear_thread_flag(TIF_NOTIFY_RESUME); |
| 651 | tracehook_notify_resume(regs); |
| 652 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | } |