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Commit | Line | Data |
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1da177e4 | 1 | /* |
d67b569f | 2 | * Copyright (C) 2002- 2004 Jeff Dike (jdike@addtoit.com) |
1da177e4 LT |
3 | * Licensed under the GPL |
4 | */ | |
5 | ||
6 | #include <stdlib.h> | |
c578455a | 7 | #include <string.h> |
1da177e4 LT |
8 | #include <unistd.h> |
9 | #include <errno.h> | |
10 | #include <signal.h> | |
11 | #include <setjmp.h> | |
12 | #include <sched.h> | |
13 | #include <sys/wait.h> | |
14 | #include <sys/mman.h> | |
15 | #include <sys/user.h> | |
9786a8f3 | 16 | #include <sys/time.h> |
1da177e4 | 17 | #include <asm/unistd.h> |
d67b569f | 18 | #include <asm/types.h> |
1da177e4 LT |
19 | #include "user.h" |
20 | #include "ptrace_user.h" | |
21 | #include "time_user.h" | |
22 | #include "sysdep/ptrace.h" | |
23 | #include "user_util.h" | |
24 | #include "kern_util.h" | |
25 | #include "skas.h" | |
9786a8f3 | 26 | #include "stub-data.h" |
d67b569f | 27 | #include "mm_id.h" |
1da177e4 | 28 | #include "sysdep/sigcontext.h" |
d67b569f | 29 | #include "sysdep/stub.h" |
1da177e4 LT |
30 | #include "os.h" |
31 | #include "proc_mm.h" | |
32 | #include "skas_ptrace.h" | |
33 | #include "chan_user.h" | |
34 | #include "signal_user.h" | |
35 | #include "registers.h" | |
d67b569f JD |
36 | #include "mem.h" |
37 | #include "uml-config.h" | |
cd2ee4a3 | 38 | #include "process.h" |
1da177e4 LT |
39 | |
40 | int is_skas_winch(int pid, int fd, void *data) | |
41 | { | |
cd2ee4a3 | 42 | if(pid != os_getpgrp()) |
1da177e4 LT |
43 | return(0); |
44 | ||
45 | register_winch_irq(-1, fd, -1, data); | |
46 | return(1); | |
47 | } | |
48 | ||
d67b569f | 49 | void wait_stub_done(int pid, int sig, char * fname) |
1da177e4 | 50 | { |
d67b569f JD |
51 | int n, status, err; |
52 | ||
53 | do { | |
54 | if ( sig != -1 ) { | |
55 | err = ptrace(PTRACE_CONT, pid, 0, sig); | |
56 | if(err) | |
57 | panic("%s : continue failed, errno = %d\n", | |
58 | fname, errno); | |
59 | } | |
60 | sig = 0; | |
61 | ||
62 | CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED)); | |
63 | } while((n >= 0) && WIFSTOPPED(status) && | |
2eaa297c JD |
64 | ((WSTOPSIG(status) == SIGVTALRM) || |
65 | /* running UML inside a detached screen can cause | |
66 | * SIGWINCHes | |
67 | */ | |
68 | (WSTOPSIG(status) == SIGWINCH))); | |
d67b569f JD |
69 | |
70 | if((n < 0) || !WIFSTOPPED(status) || | |
201134ca | 71 | (WSTOPSIG(status) != SIGUSR1 && WSTOPSIG(status) != SIGTRAP)){ |
d67b569f JD |
72 | panic("%s : failed to wait for SIGUSR1/SIGTRAP, " |
73 | "pid = %d, n = %d, errno = %d, status = 0x%x\n", | |
74 | fname, pid, n, errno, status); | |
75 | } | |
76 | } | |
c578455a | 77 | |
d67b569f JD |
78 | void get_skas_faultinfo(int pid, struct faultinfo * fi) |
79 | { | |
80 | int err; | |
81 | ||
82 | if(ptrace_faultinfo){ | |
83 | err = ptrace(PTRACE_FAULTINFO, pid, 0, fi); | |
84 | if(err) | |
85 | panic("get_skas_faultinfo - PTRACE_FAULTINFO failed, " | |
86 | "errno = %d\n", errno); | |
87 | ||
88 | /* Special handling for i386, which has different structs */ | |
89 | if (sizeof(struct ptrace_faultinfo) < sizeof(struct faultinfo)) | |
90 | memset((char *)fi + sizeof(struct ptrace_faultinfo), 0, | |
91 | sizeof(struct faultinfo) - | |
92 | sizeof(struct ptrace_faultinfo)); | |
93 | } | |
94 | else { | |
95 | wait_stub_done(pid, SIGSEGV, "get_skas_faultinfo"); | |
96 | ||
97 | /* faultinfo is prepared by the stub-segv-handler at start of | |
98 | * the stub stack page. We just have to copy it. | |
99 | */ | |
100 | memcpy(fi, (void *)current_stub_stack(), sizeof(*fi)); | |
101 | } | |
c578455a | 102 | } |
1da177e4 | 103 | |
c578455a BS |
104 | static void handle_segv(int pid, union uml_pt_regs * regs) |
105 | { | |
106 | get_skas_faultinfo(pid, ®s->skas.faultinfo); | |
107 | segv(regs->skas.faultinfo, 0, 1, NULL); | |
1da177e4 LT |
108 | } |
109 | ||
110 | /*To use the same value of using_sysemu as the caller, ask it that value (in local_using_sysemu)*/ | |
111 | static void handle_trap(int pid, union uml_pt_regs *regs, int local_using_sysemu) | |
112 | { | |
113 | int err, status; | |
114 | ||
115 | /* Mark this as a syscall */ | |
116 | UPT_SYSCALL_NR(regs) = PT_SYSCALL_NR(regs->skas.regs); | |
117 | ||
118 | if (!local_using_sysemu) | |
119 | { | |
120 | err = ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_NR_OFFSET, __NR_getpid); | |
121 | if(err < 0) | |
122 | panic("handle_trap - nullifying syscall failed errno = %d\n", | |
123 | errno); | |
124 | ||
125 | err = ptrace(PTRACE_SYSCALL, pid, 0, 0); | |
126 | if(err < 0) | |
127 | panic("handle_trap - continuing to end of syscall failed, " | |
128 | "errno = %d\n", errno); | |
129 | ||
130 | CATCH_EINTR(err = waitpid(pid, &status, WUNTRACED)); | |
131 | if((err < 0) || !WIFSTOPPED(status) || | |
132 | (WSTOPSIG(status) != SIGTRAP + 0x80)) | |
133 | panic("handle_trap - failed to wait at end of syscall, " | |
134 | "errno = %d, status = %d\n", errno, status); | |
135 | } | |
136 | ||
137 | handle_syscall(regs); | |
138 | } | |
139 | ||
d67b569f | 140 | extern int __syscall_stub_start; |
8b51304e BS |
141 | int stub_code_fd = -1; |
142 | __u64 stub_code_offset; | |
d67b569f JD |
143 | |
144 | static int userspace_tramp(void *stack) | |
1da177e4 | 145 | { |
d67b569f JD |
146 | void *addr; |
147 | ||
1da177e4 | 148 | ptrace(PTRACE_TRACEME, 0, 0, 0); |
d67b569f JD |
149 | |
150 | init_new_thread_signals(1); | |
151 | enable_timer(); | |
152 | ||
153 | if(!proc_mm){ | |
154 | /* This has a pte, but it can't be mapped in with the usual | |
155 | * tlb_flush mechanism because this is part of that mechanism | |
156 | */ | |
d67b569f | 157 | addr = mmap64((void *) UML_CONFIG_STUB_CODE, page_size(), |
8b51304e BS |
158 | PROT_EXEC, MAP_FIXED | MAP_PRIVATE, |
159 | stub_code_fd, stub_code_offset); | |
d67b569f | 160 | if(addr == MAP_FAILED){ |
8b51304e | 161 | printk("mapping stub code failed, errno = %d\n", |
d67b569f JD |
162 | errno); |
163 | exit(1); | |
164 | } | |
165 | ||
166 | if(stack != NULL){ | |
8b51304e BS |
167 | int fd; |
168 | __u64 offset; | |
169 | ||
d67b569f JD |
170 | fd = phys_mapping(to_phys(stack), &offset); |
171 | addr = mmap((void *) UML_CONFIG_STUB_DATA, page_size(), | |
172 | PROT_READ | PROT_WRITE, | |
173 | MAP_FIXED | MAP_SHARED, fd, offset); | |
174 | if(addr == MAP_FAILED){ | |
8b51304e | 175 | printk("mapping stub stack failed, " |
d67b569f JD |
176 | "errno = %d\n", errno); |
177 | exit(1); | |
178 | } | |
179 | } | |
180 | } | |
8b51304e | 181 | if(!ptrace_faultinfo){ |
d67b569f JD |
182 | unsigned long v = UML_CONFIG_STUB_CODE + |
183 | (unsigned long) stub_segv_handler - | |
184 | (unsigned long) &__syscall_stub_start; | |
185 | ||
186 | set_sigstack((void *) UML_CONFIG_STUB_DATA, page_size()); | |
187 | set_handler(SIGSEGV, (void *) v, SA_ONSTACK, | |
188 | SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, | |
189 | SIGUSR1, -1); | |
190 | } | |
191 | ||
1da177e4 LT |
192 | os_stop_process(os_getpid()); |
193 | return(0); | |
194 | } | |
195 | ||
196 | /* Each element set once, and only accessed by a single processor anyway */ | |
197 | #undef NR_CPUS | |
198 | #define NR_CPUS 1 | |
199 | int userspace_pid[NR_CPUS]; | |
200 | ||
d67b569f | 201 | int start_userspace(unsigned long stub_stack) |
1da177e4 LT |
202 | { |
203 | void *stack; | |
204 | unsigned long sp; | |
d67b569f | 205 | int pid, status, n, flags; |
1da177e4 | 206 | |
8b51304e BS |
207 | if ( stub_code_fd == -1 ) |
208 | stub_code_fd = phys_mapping(to_phys(&__syscall_stub_start), | |
209 | &stub_code_offset); | |
210 | ||
1da177e4 LT |
211 | stack = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE | PROT_EXEC, |
212 | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); | |
213 | if(stack == MAP_FAILED) | |
214 | panic("start_userspace : mmap failed, errno = %d", errno); | |
215 | sp = (unsigned long) stack + PAGE_SIZE - sizeof(void *); | |
216 | ||
d67b569f JD |
217 | flags = CLONE_FILES | SIGCHLD; |
218 | if(proc_mm) flags |= CLONE_VM; | |
219 | pid = clone(userspace_tramp, (void *) sp, flags, (void *) stub_stack); | |
1da177e4 LT |
220 | if(pid < 0) |
221 | panic("start_userspace : clone failed, errno = %d", errno); | |
222 | ||
223 | do { | |
224 | CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED)); | |
225 | if(n < 0) | |
226 | panic("start_userspace : wait failed, errno = %d", | |
227 | errno); | |
228 | } while(WIFSTOPPED(status) && (WSTOPSIG(status) == SIGVTALRM)); | |
229 | ||
230 | if(!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGSTOP)) | |
231 | panic("start_userspace : expected SIGSTOP, got status = %d", | |
232 | status); | |
233 | ||
234 | if (ptrace(PTRACE_OLDSETOPTIONS, pid, NULL, (void *)PTRACE_O_TRACESYSGOOD) < 0) | |
235 | panic("start_userspace : PTRACE_SETOPTIONS failed, errno=%d\n", | |
236 | errno); | |
237 | ||
238 | if(munmap(stack, PAGE_SIZE) < 0) | |
239 | panic("start_userspace : munmap failed, errno = %d\n", errno); | |
240 | ||
d67b569f | 241 | return(pid); |
1da177e4 LT |
242 | } |
243 | ||
244 | void userspace(union uml_pt_regs *regs) | |
245 | { | |
246 | int err, status, op, pid = userspace_pid[0]; | |
247 | int local_using_sysemu; /*To prevent races if using_sysemu changes under us.*/ | |
248 | ||
249 | while(1){ | |
250 | restore_registers(pid, regs); | |
251 | ||
252 | /* Now we set local_using_sysemu to be used for one loop */ | |
253 | local_using_sysemu = get_using_sysemu(); | |
254 | ||
255 | op = SELECT_PTRACE_OPERATION(local_using_sysemu, singlestepping(NULL)); | |
256 | ||
257 | err = ptrace(op, pid, 0, 0); | |
258 | if(err) | |
259 | panic("userspace - could not resume userspace process, " | |
260 | "pid=%d, ptrace operation = %d, errno = %d\n", | |
261 | op, errno); | |
262 | ||
263 | CATCH_EINTR(err = waitpid(pid, &status, WUNTRACED)); | |
264 | if(err < 0) | |
265 | panic("userspace - waitpid failed, errno = %d\n", | |
266 | errno); | |
267 | ||
268 | regs->skas.is_user = 1; | |
269 | save_registers(pid, regs); | |
270 | UPT_SYSCALL_NR(regs) = -1; /* Assume: It's not a syscall */ | |
271 | ||
272 | if(WIFSTOPPED(status)){ | |
273 | switch(WSTOPSIG(status)){ | |
274 | case SIGSEGV: | |
d67b569f JD |
275 | if(PTRACE_FULL_FAULTINFO || !ptrace_faultinfo) |
276 | user_signal(SIGSEGV, regs, pid); | |
277 | else handle_segv(pid, regs); | |
1da177e4 LT |
278 | break; |
279 | case SIGTRAP + 0x80: | |
280 | handle_trap(pid, regs, local_using_sysemu); | |
281 | break; | |
282 | case SIGTRAP: | |
283 | relay_signal(SIGTRAP, regs); | |
284 | break; | |
285 | case SIGIO: | |
286 | case SIGVTALRM: | |
287 | case SIGILL: | |
288 | case SIGBUS: | |
289 | case SIGFPE: | |
290 | case SIGWINCH: | |
c578455a | 291 | user_signal(WSTOPSIG(status), regs, pid); |
1da177e4 LT |
292 | break; |
293 | default: | |
294 | printk("userspace - child stopped with signal " | |
295 | "%d\n", WSTOPSIG(status)); | |
296 | } | |
d67b569f | 297 | pid = userspace_pid[0]; |
1da177e4 LT |
298 | interrupt_end(); |
299 | ||
300 | /* Avoid -ERESTARTSYS handling in host */ | |
301 | PT_SYSCALL_NR(regs->skas.regs) = -1; | |
302 | } | |
303 | } | |
304 | } | |
675dffc9 JD |
305 | #define INIT_JMP_NEW_THREAD 0 |
306 | #define INIT_JMP_REMOVE_SIGSTACK 1 | |
307 | #define INIT_JMP_CALLBACK 2 | |
308 | #define INIT_JMP_HALT 3 | |
309 | #define INIT_JMP_REBOOT 4 | |
1da177e4 | 310 | |
9786a8f3 BS |
311 | |
312 | int copy_context_skas0(unsigned long new_stack, int pid) | |
313 | { | |
314 | int err; | |
315 | unsigned long regs[MAX_REG_NR]; | |
316 | unsigned long current_stack = current_stub_stack(); | |
317 | struct stub_data *data = (struct stub_data *) current_stack; | |
318 | struct stub_data *child_data = (struct stub_data *) new_stack; | |
319 | __u64 new_offset; | |
320 | int new_fd = phys_mapping(to_phys((void *)new_stack), &new_offset); | |
321 | ||
322 | /* prepare offset and fd of child's stack as argument for parent's | |
323 | * and child's mmap2 calls | |
324 | */ | |
325 | *data = ((struct stub_data) { .offset = MMAP_OFFSET(new_offset), | |
326 | .fd = new_fd, | |
327 | .timer = ((struct itimerval) | |
328 | { { 0, 1000000 / hz() }, | |
329 | { 0, 1000000 / hz() }})}); | |
330 | get_safe_registers(regs); | |
331 | ||
332 | /* Set parent's instruction pointer to start of clone-stub */ | |
333 | regs[REGS_IP_INDEX] = UML_CONFIG_STUB_CODE + | |
334 | (unsigned long) stub_clone_handler - | |
335 | (unsigned long) &__syscall_stub_start; | |
336 | regs[REGS_SP_INDEX] = UML_CONFIG_STUB_DATA + PAGE_SIZE - | |
337 | sizeof(void *); | |
338 | err = ptrace_setregs(pid, regs); | |
339 | if(err < 0) | |
340 | panic("copy_context_skas0 : PTRACE_SETREGS failed, " | |
341 | "pid = %d, errno = %d\n", pid, errno); | |
342 | ||
343 | /* set a well known return code for detection of child write failure */ | |
344 | child_data->err = 12345678; | |
345 | ||
346 | /* Wait, until parent has finished its work: read child's pid from | |
347 | * parent's stack, and check, if bad result. | |
348 | */ | |
349 | wait_stub_done(pid, 0, "copy_context_skas0"); | |
350 | ||
351 | pid = data->err; | |
352 | if(pid < 0) | |
353 | panic("copy_context_skas0 - stub-parent reports error %d\n", | |
354 | pid); | |
355 | ||
356 | /* Wait, until child has finished too: read child's result from | |
357 | * child's stack and check it. | |
358 | */ | |
359 | wait_stub_done(pid, -1, "copy_context_skas0"); | |
360 | if (child_data->err != UML_CONFIG_STUB_DATA) | |
361 | panic("copy_context_skas0 - stub-child reports error %d\n", | |
362 | child_data->err); | |
363 | ||
364 | if (ptrace(PTRACE_OLDSETOPTIONS, pid, NULL, | |
365 | (void *)PTRACE_O_TRACESYSGOOD) < 0) | |
366 | panic("copy_context_skas0 : PTRACE_SETOPTIONS failed, " | |
367 | "errno = %d\n", errno); | |
368 | ||
369 | return pid; | |
370 | } | |
371 | ||
8b51304e BS |
372 | /* |
373 | * This is used only, if proc_mm is available, while PTRACE_FAULTINFO | |
374 | * isn't. Opening /proc/mm creates a new mm_context, which lacks the stub-pages | |
375 | * Thus, we map them using /proc/mm-fd | |
376 | */ | |
377 | void map_stub_pages(int fd, unsigned long code, | |
378 | unsigned long data, unsigned long stack) | |
379 | { | |
380 | struct proc_mm_op mmop; | |
381 | int n; | |
382 | ||
383 | mmop = ((struct proc_mm_op) { .op = MM_MMAP, | |
384 | .u = | |
385 | { .mmap = | |
386 | { .addr = code, | |
387 | .len = PAGE_SIZE, | |
388 | .prot = PROT_EXEC, | |
389 | .flags = MAP_FIXED | MAP_PRIVATE, | |
390 | .fd = stub_code_fd, | |
391 | .offset = stub_code_offset | |
392 | } } }); | |
393 | n = os_write_file(fd, &mmop, sizeof(mmop)); | |
394 | if(n != sizeof(mmop)) | |
395 | panic("map_stub_pages : /proc/mm map for code failed, " | |
396 | "err = %d\n", -n); | |
397 | ||
398 | if ( stack ) { | |
399 | __u64 map_offset; | |
400 | int map_fd = phys_mapping(to_phys((void *)stack), &map_offset); | |
401 | mmop = ((struct proc_mm_op) | |
402 | { .op = MM_MMAP, | |
403 | .u = | |
404 | { .mmap = | |
405 | { .addr = data, | |
406 | .len = PAGE_SIZE, | |
407 | .prot = PROT_READ | PROT_WRITE, | |
408 | .flags = MAP_FIXED | MAP_SHARED, | |
409 | .fd = map_fd, | |
410 | .offset = map_offset | |
411 | } } }); | |
412 | n = os_write_file(fd, &mmop, sizeof(mmop)); | |
413 | if(n != sizeof(mmop)) | |
414 | panic("map_stub_pages : /proc/mm map for data failed, " | |
415 | "err = %d\n", -n); | |
416 | } | |
417 | } | |
418 | ||
1da177e4 LT |
419 | void new_thread(void *stack, void **switch_buf_ptr, void **fork_buf_ptr, |
420 | void (*handler)(int)) | |
421 | { | |
422 | unsigned long flags; | |
423 | sigjmp_buf switch_buf, fork_buf; | |
424 | ||
425 | *switch_buf_ptr = &switch_buf; | |
426 | *fork_buf_ptr = &fork_buf; | |
427 | ||
428 | /* Somewhat subtle - siglongjmp restores the signal mask before doing | |
429 | * the longjmp. This means that when jumping from one stack to another | |
430 | * when the target stack has interrupts enabled, an interrupt may occur | |
431 | * on the source stack. This is bad when starting up a process because | |
432 | * it's not supposed to get timer ticks until it has been scheduled. | |
433 | * So, we disable interrupts around the sigsetjmp to ensure that | |
434 | * they can't happen until we get back here where they are safe. | |
435 | */ | |
436 | flags = get_signals(); | |
437 | block_signals(); | |
438 | if(sigsetjmp(fork_buf, 1) == 0) | |
439 | new_thread_proc(stack, handler); | |
440 | ||
441 | remove_sigstack(); | |
442 | ||
443 | set_signals(flags); | |
444 | } | |
445 | ||
446 | void thread_wait(void *sw, void *fb) | |
447 | { | |
448 | sigjmp_buf buf, **switch_buf = sw, *fork_buf; | |
449 | ||
450 | *switch_buf = &buf; | |
451 | fork_buf = fb; | |
452 | if(sigsetjmp(buf, 1) == 0) | |
675dffc9 | 453 | siglongjmp(*fork_buf, INIT_JMP_REMOVE_SIGSTACK); |
1da177e4 LT |
454 | } |
455 | ||
456 | void switch_threads(void *me, void *next) | |
457 | { | |
458 | sigjmp_buf my_buf, **me_ptr = me, *next_buf = next; | |
459 | ||
460 | *me_ptr = &my_buf; | |
461 | if(sigsetjmp(my_buf, 1) == 0) | |
462 | siglongjmp(*next_buf, 1); | |
463 | } | |
464 | ||
465 | static sigjmp_buf initial_jmpbuf; | |
466 | ||
467 | /* XXX Make these percpu */ | |
468 | static void (*cb_proc)(void *arg); | |
469 | static void *cb_arg; | |
470 | static sigjmp_buf *cb_back; | |
471 | ||
472 | int start_idle_thread(void *stack, void *switch_buf_ptr, void **fork_buf_ptr) | |
473 | { | |
474 | sigjmp_buf **switch_buf = switch_buf_ptr; | |
475 | int n; | |
476 | ||
cd2ee4a3 JD |
477 | set_handler(SIGWINCH, (__sighandler_t) sig_handler, |
478 | SA_ONSTACK | SA_RESTART, SIGUSR1, SIGIO, SIGALRM, | |
479 | SIGVTALRM, -1); | |
480 | ||
1da177e4 LT |
481 | *fork_buf_ptr = &initial_jmpbuf; |
482 | n = sigsetjmp(initial_jmpbuf, 1); | |
675dffc9 JD |
483 | switch(n){ |
484 | case INIT_JMP_NEW_THREAD: | |
485 | new_thread_proc((void *) stack, new_thread_handler); | |
486 | break; | |
487 | case INIT_JMP_REMOVE_SIGSTACK: | |
488 | remove_sigstack(); | |
489 | break; | |
490 | case INIT_JMP_CALLBACK: | |
1da177e4 LT |
491 | (*cb_proc)(cb_arg); |
492 | siglongjmp(*cb_back, 1); | |
675dffc9 JD |
493 | break; |
494 | case INIT_JMP_HALT: | |
1da177e4 LT |
495 | kmalloc_ok = 0; |
496 | return(0); | |
675dffc9 | 497 | case INIT_JMP_REBOOT: |
1da177e4 LT |
498 | kmalloc_ok = 0; |
499 | return(1); | |
675dffc9 JD |
500 | default: |
501 | panic("Bad sigsetjmp return in start_idle_thread - %d\n", n); | |
1da177e4 LT |
502 | } |
503 | siglongjmp(**switch_buf, 1); | |
504 | } | |
505 | ||
506 | void remove_sigstack(void) | |
507 | { | |
508 | stack_t stack = ((stack_t) { .ss_flags = SS_DISABLE, | |
509 | .ss_sp = NULL, | |
510 | .ss_size = 0 }); | |
511 | ||
512 | if(sigaltstack(&stack, NULL) != 0) | |
513 | panic("disabling signal stack failed, errno = %d\n", errno); | |
514 | } | |
515 | ||
516 | void initial_thread_cb_skas(void (*proc)(void *), void *arg) | |
517 | { | |
518 | sigjmp_buf here; | |
519 | ||
520 | cb_proc = proc; | |
521 | cb_arg = arg; | |
522 | cb_back = &here; | |
523 | ||
524 | block_signals(); | |
525 | if(sigsetjmp(here, 1) == 0) | |
675dffc9 | 526 | siglongjmp(initial_jmpbuf, INIT_JMP_CALLBACK); |
1da177e4 LT |
527 | unblock_signals(); |
528 | ||
529 | cb_proc = NULL; | |
530 | cb_arg = NULL; | |
531 | cb_back = NULL; | |
532 | } | |
533 | ||
534 | void halt_skas(void) | |
535 | { | |
536 | block_signals(); | |
675dffc9 | 537 | siglongjmp(initial_jmpbuf, INIT_JMP_HALT); |
1da177e4 LT |
538 | } |
539 | ||
540 | void reboot_skas(void) | |
541 | { | |
542 | block_signals(); | |
675dffc9 | 543 | siglongjmp(initial_jmpbuf, INIT_JMP_REBOOT); |
1da177e4 LT |
544 | } |
545 | ||
d67b569f | 546 | void switch_mm_skas(struct mm_id *mm_idp) |
1da177e4 LT |
547 | { |
548 | int err; | |
549 | ||
550 | #warning need cpu pid in switch_mm_skas | |
d67b569f JD |
551 | if(proc_mm){ |
552 | err = ptrace(PTRACE_SWITCH_MM, userspace_pid[0], 0, | |
553 | mm_idp->u.mm_fd); | |
554 | if(err) | |
555 | panic("switch_mm_skas - PTRACE_SWITCH_MM failed, " | |
556 | "errno = %d\n", errno); | |
557 | } | |
558 | else userspace_pid[0] = mm_idp->u.pid; | |
1da177e4 LT |
559 | } |
560 | ||
561 | /* | |
562 | * Overrides for Emacs so that we follow Linus's tabbing style. | |
563 | * Emacs will notice this stuff at the end of the file and automatically | |
564 | * adjust the settings for this buffer only. This must remain at the end | |
565 | * of the file. | |
566 | * --------------------------------------------------------------------------- | |
567 | * Local variables: | |
568 | * c-file-style: "linux" | |
569 | * End: | |
570 | */ |