pciehp: make pciehp build for powerpc
[linux-2.6.22.y-op.git] / arch / m32r / kernel / signal.c
bloba9174efe80cbf95379d3891de21f0c3b660eeb92
1 /*
2 * linux/arch/m32r/kernel/signal.c
4 * Copyright (c) 2003 Hitoshi Yamamoto
6 * Taken from i386 version.
7 * Copyright (C) 1991, 1992 Linus Torvalds
9 * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
10 * 2000-06-20 Pentium III FXSR, SSE support by Gareth Hughes
13 #include <linux/sched.h>
14 #include <linux/mm.h>
15 #include <linux/smp.h>
16 #include <linux/smp_lock.h>
17 #include <linux/kernel.h>
18 #include <linux/signal.h>
19 #include <linux/errno.h>
20 #include <linux/wait.h>
21 #include <linux/unistd.h>
22 #include <linux/stddef.h>
23 #include <linux/personality.h>
24 #include <linux/suspend.h>
25 #include <asm/cacheflush.h>
26 #include <asm/ucontext.h>
27 #include <asm/uaccess.h>
29 #define DEBUG_SIG 0
31 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
33 int do_signal(struct pt_regs *, sigset_t *);
35 asmlinkage int
36 sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize,
37 unsigned long r2, unsigned long r3, unsigned long r4,
38 unsigned long r5, unsigned long r6, struct pt_regs *regs)
40 sigset_t saveset, newset;
42 /* XXX: Don't preclude handling different sized sigset_t's. */
43 if (sigsetsize != sizeof(sigset_t))
44 return -EINVAL;
46 if (copy_from_user(&newset, unewset, sizeof(newset)))
47 return -EFAULT;
48 sigdelsetmask(&newset, ~_BLOCKABLE);
50 spin_lock_irq(&current->sighand->siglock);
51 saveset = current->blocked;
52 current->blocked = newset;
53 recalc_sigpending();
54 spin_unlock_irq(&current->sighand->siglock);
56 regs->r0 = -EINTR;
57 while (1) {
58 current->state = TASK_INTERRUPTIBLE;
59 schedule();
60 if (do_signal(regs, &saveset))
61 return regs->r0;
65 asmlinkage int
66 sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
67 unsigned long r2, unsigned long r3, unsigned long r4,
68 unsigned long r5, unsigned long r6, struct pt_regs *regs)
70 return do_sigaltstack(uss, uoss, regs->spu);
75 * Do a signal return; undo the signal stack.
78 struct rt_sigframe
80 int sig;
81 struct siginfo *pinfo;
82 void *puc;
83 struct siginfo info;
84 struct ucontext uc;
85 // struct _fpstate fpstate;
88 static int
89 restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc,
90 int *r0_p)
92 unsigned int err = 0;
94 /* Always make any pending restarted system calls return -EINTR */
95 current_thread_info()->restart_block.fn = do_no_restart_syscall;
97 #define COPY(x) err |= __get_user(regs->x, &sc->sc_##x)
98 COPY(r4);
99 COPY(r5);
100 COPY(r6);
101 COPY(pt_regs);
102 /* COPY(r0); Skip r0 */
103 COPY(r1);
104 COPY(r2);
105 COPY(r3);
106 COPY(r7);
107 COPY(r8);
108 COPY(r9);
109 COPY(r10);
110 COPY(r11);
111 COPY(r12);
112 #if defined(CONFIG_ISA_M32R2) && defined(CONFIG_ISA_DSP_LEVEL2)
113 COPY(acc0h);
114 COPY(acc0l);
115 COPY(acc1h);
116 COPY(acc1l);
117 #elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R)
118 COPY(acch);
119 COPY(accl);
120 COPY(dummy_acc1h);
121 COPY(dummy_acc1l);
122 #else
123 #error unknown isa configuration
124 #endif
125 COPY(psw);
126 COPY(bpc);
127 COPY(bbpsw);
128 COPY(bbpc);
129 COPY(spu);
130 COPY(fp);
131 COPY(lr);
132 COPY(spi);
133 #undef COPY
135 regs->syscall_nr = -1; /* disable syscall checks */
136 err |= __get_user(*r0_p, &sc->sc_r0);
138 return err;
141 asmlinkage int
142 sys_rt_sigreturn(unsigned long r0, unsigned long r1,
143 unsigned long r2, unsigned long r3, unsigned long r4,
144 unsigned long r5, unsigned long r6, struct pt_regs *regs)
146 struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs->spu;
147 sigset_t set;
148 int result;
150 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
151 goto badframe;
152 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
153 goto badframe;
155 sigdelsetmask(&set, ~_BLOCKABLE);
156 spin_lock_irq(&current->sighand->siglock);
157 current->blocked = set;
158 recalc_sigpending();
159 spin_unlock_irq(&current->sighand->siglock);
161 if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &result))
162 goto badframe;
164 if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->spu) == -EFAULT)
165 goto badframe;
167 return result;
169 badframe:
170 force_sig(SIGSEGV, current);
171 return 0;
175 * Set up a signal frame.
178 static int
179 setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
180 unsigned long mask)
182 int err = 0;
184 #define COPY(x) err |= __put_user(regs->x, &sc->sc_##x)
185 COPY(r4);
186 COPY(r5);
187 COPY(r6);
188 COPY(pt_regs);
189 COPY(r0);
190 COPY(r1);
191 COPY(r2);
192 COPY(r3);
193 COPY(r7);
194 COPY(r8);
195 COPY(r9);
196 COPY(r10);
197 COPY(r11);
198 COPY(r12);
199 #if defined(CONFIG_ISA_M32R2) && defined(CONFIG_ISA_DSP_LEVEL2)
200 COPY(acc0h);
201 COPY(acc0l);
202 COPY(acc1h);
203 COPY(acc1l);
204 #elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R)
205 COPY(acch);
206 COPY(accl);
207 COPY(dummy_acc1h);
208 COPY(dummy_acc1l);
209 #else
210 #error unknown isa configuration
211 #endif
212 COPY(psw);
213 COPY(bpc);
214 COPY(bbpsw);
215 COPY(bbpc);
216 COPY(spu);
217 COPY(fp);
218 COPY(lr);
219 COPY(spi);
220 #undef COPY
222 err |= __put_user(mask, &sc->oldmask);
224 return err;
228 * Determine which stack to use..
230 static inline void __user *
231 get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
233 /* This is the X/Open sanctioned signal stack switching. */
234 if (ka->sa.sa_flags & SA_ONSTACK) {
235 if (sas_ss_flags(sp) == 0)
236 sp = current->sas_ss_sp + current->sas_ss_size;
239 return (void __user *)((sp - frame_size) & -8ul);
242 static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
243 sigset_t *set, struct pt_regs *regs)
245 struct rt_sigframe __user *frame;
246 int err = 0;
247 int signal;
249 frame = get_sigframe(ka, regs->spu, sizeof(*frame));
251 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
252 goto give_sigsegv;
254 signal = current_thread_info()->exec_domain
255 && current_thread_info()->exec_domain->signal_invmap
256 && sig < 32
257 ? current_thread_info()->exec_domain->signal_invmap[sig]
258 : sig;
260 err |= __put_user(signal, &frame->sig);
261 if (err)
262 goto give_sigsegv;
264 err |= __put_user(&frame->info, &frame->pinfo);
265 err |= __put_user(&frame->uc, &frame->puc);
266 err |= copy_siginfo_to_user(&frame->info, info);
267 if (err)
268 goto give_sigsegv;
270 /* Create the ucontext. */
271 err |= __put_user(0, &frame->uc.uc_flags);
272 err |= __put_user(0, &frame->uc.uc_link);
273 err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
274 err |= __put_user(sas_ss_flags(regs->spu),
275 &frame->uc.uc_stack.ss_flags);
276 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
277 err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]);
278 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
279 if (err)
280 goto give_sigsegv;
282 /* Set up to return from userspace. */
283 regs->lr = (unsigned long)ka->sa.sa_restorer;
285 /* Set up registers for signal handler */
286 regs->spu = (unsigned long)frame;
287 regs->r0 = signal; /* Arg for signal handler */
288 regs->r1 = (unsigned long)&frame->info;
289 regs->r2 = (unsigned long)&frame->uc;
290 regs->bpc = (unsigned long)ka->sa.sa_handler;
292 set_fs(USER_DS);
294 #if DEBUG_SIG
295 printk("SIG deliver (%s:%d): sp=%p pc=%p\n",
296 current->comm, current->pid, frame, regs->pc);
297 #endif
299 return;
301 give_sigsegv:
302 force_sigsegv(sig, current);
306 * OK, we're invoking a handler
309 static void
310 handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
311 sigset_t *oldset, struct pt_regs *regs)
313 unsigned short inst;
315 /* Are we from a system call? */
316 if (regs->syscall_nr >= 0) {
317 /* If so, check system call restarting.. */
318 switch (regs->r0) {
319 case -ERESTART_RESTARTBLOCK:
320 case -ERESTARTNOHAND:
321 regs->r0 = -EINTR;
322 break;
324 case -ERESTARTSYS:
325 if (!(ka->sa.sa_flags & SA_RESTART)) {
326 regs->r0 = -EINTR;
327 break;
329 /* fallthrough */
330 case -ERESTARTNOINTR:
331 regs->r0 = regs->orig_r0;
332 inst = *(unsigned short *)(regs->bpc - 2);
333 if ((inst & 0xfff0) == 0x10f0) /* trap ? */
334 regs->bpc -= 2;
335 else
336 regs->bpc -= 4;
340 /* Set up the stack frame */
341 setup_rt_frame(sig, ka, info, oldset, regs);
343 spin_lock_irq(&current->sighand->siglock);
344 sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
345 if (!(ka->sa.sa_flags & SA_NODEFER))
346 sigaddset(&current->blocked,sig);
347 recalc_sigpending();
348 spin_unlock_irq(&current->sighand->siglock);
352 * Note that 'init' is a special process: it doesn't get signals it doesn't
353 * want to handle. Thus you cannot kill init even with a SIGKILL even by
354 * mistake.
356 int do_signal(struct pt_regs *regs, sigset_t *oldset)
358 siginfo_t info;
359 int signr;
360 struct k_sigaction ka;
361 unsigned short inst;
364 * We want the common case to go fast, which
365 * is why we may in certain cases get here from
366 * kernel mode. Just return without doing anything
367 * if so.
369 if (!user_mode(regs))
370 return 1;
372 if (try_to_freeze())
373 goto no_signal;
375 if (!oldset)
376 oldset = &current->blocked;
378 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
379 if (signr > 0) {
380 /* Reenable any watchpoints before delivering the
381 * signal to user space. The processor register will
382 * have been cleared if the watchpoint triggered
383 * inside the kernel.
386 /* Whee! Actually deliver the signal. */
387 handle_signal(signr, &ka, &info, oldset, regs);
388 return 1;
391 no_signal:
392 /* Did we come from a system call? */
393 if (regs->syscall_nr >= 0) {
394 /* Restart the system call - no handlers present */
395 if (regs->r0 == -ERESTARTNOHAND ||
396 regs->r0 == -ERESTARTSYS ||
397 regs->r0 == -ERESTARTNOINTR) {
398 regs->r0 = regs->orig_r0;
399 inst = *(unsigned short *)(regs->bpc - 2);
400 if ((inst & 0xfff0) == 0x10f0) /* trap ? */
401 regs->bpc -= 2;
402 else
403 regs->bpc -= 4;
405 if (regs->r0 == -ERESTART_RESTARTBLOCK){
406 regs->r0 = regs->orig_r0;
407 regs->r7 = __NR_restart_syscall;
408 inst = *(unsigned short *)(regs->bpc - 2);
409 if ((inst & 0xfff0) == 0x10f0) /* trap ? */
410 regs->bpc -= 2;
411 else
412 regs->bpc -= 4;
415 return 0;
419 * notification of userspace execution resumption
420 * - triggered by current->work.notify_resume
422 void do_notify_resume(struct pt_regs *regs, sigset_t *oldset,
423 __u32 thread_info_flags)
425 /* Pending single-step? */
426 if (thread_info_flags & _TIF_SINGLESTEP)
427 clear_thread_flag(TIF_SINGLESTEP);
429 /* deal with pending signal delivery */
430 if (thread_info_flags & _TIF_SIGPENDING)
431 do_signal(regs,oldset);
433 clear_thread_flag(TIF_IRET);