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abaf6977 GS |
1 | /* |
2 | * Copyright (C) 2002- 2004 Jeff Dike (jdike@addtoit.com) | |
3 | * Licensed under the GPL | |
4 | */ | |
5 | ||
6 | #include <stdlib.h> | |
7 | #include <string.h> | |
8 | #include <unistd.h> | |
9 | #include <errno.h> | |
10 | #include <signal.h> | |
11 | #include <setjmp.h> | |
12 | #include <sched.h> | |
13 | #include "ptrace_user.h" | |
14 | #include <sys/wait.h> | |
15 | #include <sys/mman.h> | |
16 | #include <sys/user.h> | |
17 | #include <sys/time.h> | |
18 | #include <asm/unistd.h> | |
19 | #include <asm/types.h> | |
20 | #include "user.h" | |
21 | #include "sysdep/ptrace.h" | |
22 | #include "user_util.h" | |
23 | #include "kern_util.h" | |
24 | #include "skas.h" | |
25 | #include "stub-data.h" | |
26 | #include "mm_id.h" | |
27 | #include "sysdep/sigcontext.h" | |
28 | #include "sysdep/stub.h" | |
29 | #include "os.h" | |
30 | #include "proc_mm.h" | |
31 | #include "skas_ptrace.h" | |
32 | #include "chan_user.h" | |
33 | #include "registers.h" | |
34 | #include "mem.h" | |
35 | #include "uml-config.h" | |
36 | #include "process.h" | |
1d7173ba | 37 | #include "longjmp.h" |
abaf6977 GS |
38 | |
39 | int is_skas_winch(int pid, int fd, void *data) | |
40 | { | |
41 | if(pid != os_getpgrp()) | |
42 | return(0); | |
43 | ||
44 | register_winch_irq(-1, fd, -1, data); | |
45 | return(1); | |
46 | } | |
47 | ||
48 | void wait_stub_done(int pid, int sig, char * fname) | |
49 | { | |
50 | int n, status, err; | |
51 | ||
52 | do { | |
53 | if ( sig != -1 ) { | |
54 | err = ptrace(PTRACE_CONT, pid, 0, sig); | |
55 | if(err) | |
56 | panic("%s : continue failed, errno = %d\n", | |
57 | fname, errno); | |
58 | } | |
59 | sig = 0; | |
60 | ||
61 | CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED)); | |
62 | } while((n >= 0) && WIFSTOPPED(status) && | |
63 | ((WSTOPSIG(status) == SIGVTALRM) || | |
64 | /* running UML inside a detached screen can cause | |
65 | * SIGWINCHes | |
66 | */ | |
67 | (WSTOPSIG(status) == SIGWINCH))); | |
68 | ||
69 | if((n < 0) || !WIFSTOPPED(status) || | |
70 | (WSTOPSIG(status) != SIGUSR1 && WSTOPSIG(status) != SIGTRAP)){ | |
71 | unsigned long regs[HOST_FRAME_SIZE]; | |
72 | ||
73 | if(ptrace(PTRACE_GETREGS, pid, 0, regs) < 0) | |
74 | printk("Failed to get registers from stub, " | |
75 | "errno = %d\n", errno); | |
76 | else { | |
77 | int i; | |
78 | ||
79 | printk("Stub registers -\n"); | |
80 | for(i = 0; i < HOST_FRAME_SIZE; i++) | |
81 | printk("\t%d - %lx\n", i, regs[i]); | |
82 | } | |
83 | panic("%s : failed to wait for SIGUSR1/SIGTRAP, " | |
84 | "pid = %d, n = %d, errno = %d, status = 0x%x\n", | |
85 | fname, pid, n, errno, status); | |
86 | } | |
87 | } | |
88 | ||
89 | extern unsigned long current_stub_stack(void); | |
90 | ||
91 | void get_skas_faultinfo(int pid, struct faultinfo * fi) | |
92 | { | |
93 | int err; | |
94 | ||
95 | if(ptrace_faultinfo){ | |
96 | err = ptrace(PTRACE_FAULTINFO, pid, 0, fi); | |
97 | if(err) | |
98 | panic("get_skas_faultinfo - PTRACE_FAULTINFO failed, " | |
99 | "errno = %d\n", errno); | |
100 | ||
101 | /* Special handling for i386, which has different structs */ | |
102 | if (sizeof(struct ptrace_faultinfo) < sizeof(struct faultinfo)) | |
103 | memset((char *)fi + sizeof(struct ptrace_faultinfo), 0, | |
104 | sizeof(struct faultinfo) - | |
105 | sizeof(struct ptrace_faultinfo)); | |
106 | } | |
107 | else { | |
108 | wait_stub_done(pid, SIGSEGV, "get_skas_faultinfo"); | |
109 | ||
110 | /* faultinfo is prepared by the stub-segv-handler at start of | |
111 | * the stub stack page. We just have to copy it. | |
112 | */ | |
113 | memcpy(fi, (void *)current_stub_stack(), sizeof(*fi)); | |
114 | } | |
115 | } | |
116 | ||
117 | static void handle_segv(int pid, union uml_pt_regs * regs) | |
118 | { | |
119 | get_skas_faultinfo(pid, ®s->skas.faultinfo); | |
120 | segv(regs->skas.faultinfo, 0, 1, NULL); | |
121 | } | |
122 | ||
123 | /*To use the same value of using_sysemu as the caller, ask it that value (in local_using_sysemu)*/ | |
124 | static void handle_trap(int pid, union uml_pt_regs *regs, int local_using_sysemu) | |
125 | { | |
126 | int err, status; | |
127 | ||
128 | /* Mark this as a syscall */ | |
129 | UPT_SYSCALL_NR(regs) = PT_SYSCALL_NR(regs->skas.regs); | |
130 | ||
131 | if (!local_using_sysemu) | |
132 | { | |
133 | err = ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_NR_OFFSET, | |
134 | __NR_getpid); | |
135 | if(err < 0) | |
136 | panic("handle_trap - nullifying syscall failed errno = %d\n", | |
137 | errno); | |
138 | ||
139 | err = ptrace(PTRACE_SYSCALL, pid, 0, 0); | |
140 | if(err < 0) | |
141 | panic("handle_trap - continuing to end of syscall failed, " | |
142 | "errno = %d\n", errno); | |
143 | ||
144 | CATCH_EINTR(err = waitpid(pid, &status, WUNTRACED)); | |
145 | if((err < 0) || !WIFSTOPPED(status) || | |
146 | (WSTOPSIG(status) != SIGTRAP + 0x80)) | |
147 | panic("handle_trap - failed to wait at end of syscall, " | |
148 | "errno = %d, status = %d\n", errno, status); | |
149 | } | |
150 | ||
151 | handle_syscall(regs); | |
152 | } | |
153 | ||
154 | extern int __syscall_stub_start; | |
abaf6977 GS |
155 | |
156 | static int userspace_tramp(void *stack) | |
157 | { | |
158 | void *addr; | |
159 | ||
160 | ptrace(PTRACE_TRACEME, 0, 0, 0); | |
161 | ||
e64bd134 | 162 | init_new_thread_signals(); |
abaf6977 GS |
163 | enable_timer(); |
164 | ||
165 | if(!proc_mm){ | |
166 | /* This has a pte, but it can't be mapped in with the usual | |
167 | * tlb_flush mechanism because this is part of that mechanism | |
168 | */ | |
09ee011e JD |
169 | int fd; |
170 | __u64 offset; | |
171 | fd = phys_mapping(to_phys(&__syscall_stub_start), &offset); | |
abaf6977 | 172 | addr = mmap64((void *) UML_CONFIG_STUB_CODE, page_size(), |
09ee011e | 173 | PROT_EXEC, MAP_FIXED | MAP_PRIVATE, fd, offset); |
abaf6977 | 174 | if(addr == MAP_FAILED){ |
09ee011e | 175 | printk("mapping mmap stub failed, errno = %d\n", |
abaf6977 GS |
176 | errno); |
177 | exit(1); | |
178 | } | |
179 | ||
180 | if(stack != NULL){ | |
abaf6977 GS |
181 | fd = phys_mapping(to_phys(stack), &offset); |
182 | addr = mmap((void *) UML_CONFIG_STUB_DATA, page_size(), | |
183 | PROT_READ | PROT_WRITE, | |
184 | MAP_FIXED | MAP_SHARED, fd, offset); | |
185 | if(addr == MAP_FAILED){ | |
09ee011e | 186 | printk("mapping segfault stack failed, " |
abaf6977 GS |
187 | "errno = %d\n", errno); |
188 | exit(1); | |
189 | } | |
190 | } | |
191 | } | |
09ee011e | 192 | if(!ptrace_faultinfo && (stack != NULL)){ |
abaf6977 GS |
193 | unsigned long v = UML_CONFIG_STUB_CODE + |
194 | (unsigned long) stub_segv_handler - | |
195 | (unsigned long) &__syscall_stub_start; | |
196 | ||
197 | set_sigstack((void *) UML_CONFIG_STUB_DATA, page_size()); | |
198 | set_handler(SIGSEGV, (void *) v, SA_ONSTACK, | |
199 | SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, | |
200 | SIGUSR1, -1); | |
201 | } | |
202 | ||
203 | os_stop_process(os_getpid()); | |
204 | return(0); | |
205 | } | |
206 | ||
207 | /* Each element set once, and only accessed by a single processor anyway */ | |
208 | #undef NR_CPUS | |
209 | #define NR_CPUS 1 | |
210 | int userspace_pid[NR_CPUS]; | |
211 | ||
212 | int start_userspace(unsigned long stub_stack) | |
213 | { | |
214 | void *stack; | |
215 | unsigned long sp; | |
216 | int pid, status, n, flags; | |
217 | ||
abaf6977 GS |
218 | stack = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE | PROT_EXEC, |
219 | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); | |
220 | if(stack == MAP_FAILED) | |
221 | panic("start_userspace : mmap failed, errno = %d", errno); | |
222 | sp = (unsigned long) stack + PAGE_SIZE - sizeof(void *); | |
223 | ||
224 | flags = CLONE_FILES | SIGCHLD; | |
225 | if(proc_mm) flags |= CLONE_VM; | |
226 | pid = clone(userspace_tramp, (void *) sp, flags, (void *) stub_stack); | |
227 | if(pid < 0) | |
228 | panic("start_userspace : clone failed, errno = %d", errno); | |
229 | ||
230 | do { | |
231 | CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED)); | |
232 | if(n < 0) | |
233 | panic("start_userspace : wait failed, errno = %d", | |
234 | errno); | |
235 | } while(WIFSTOPPED(status) && (WSTOPSIG(status) == SIGVTALRM)); | |
236 | ||
237 | if(!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGSTOP)) | |
238 | panic("start_userspace : expected SIGSTOP, got status = %d", | |
239 | status); | |
240 | ||
241 | if (ptrace(PTRACE_OLDSETOPTIONS, pid, NULL, (void *)PTRACE_O_TRACESYSGOOD) < 0) | |
242 | panic("start_userspace : PTRACE_OLDSETOPTIONS failed, errno=%d\n", | |
243 | errno); | |
244 | ||
245 | if(munmap(stack, PAGE_SIZE) < 0) | |
246 | panic("start_userspace : munmap failed, errno = %d\n", errno); | |
247 | ||
248 | return(pid); | |
249 | } | |
250 | ||
251 | void userspace(union uml_pt_regs *regs) | |
252 | { | |
253 | int err, status, op, pid = userspace_pid[0]; | |
254 | int local_using_sysemu; /*To prevent races if using_sysemu changes under us.*/ | |
255 | ||
256 | while(1){ | |
257 | restore_registers(pid, regs); | |
258 | ||
259 | /* Now we set local_using_sysemu to be used for one loop */ | |
260 | local_using_sysemu = get_using_sysemu(); | |
261 | ||
262 | op = SELECT_PTRACE_OPERATION(local_using_sysemu, singlestepping(NULL)); | |
263 | ||
264 | err = ptrace(op, pid, 0, 0); | |
265 | if(err) | |
266 | panic("userspace - could not resume userspace process, " | |
267 | "pid=%d, ptrace operation = %d, errno = %d\n", | |
802e3077 | 268 | pid, op, errno); |
abaf6977 GS |
269 | |
270 | CATCH_EINTR(err = waitpid(pid, &status, WUNTRACED)); | |
271 | if(err < 0) | |
272 | panic("userspace - waitpid failed, errno = %d\n", | |
273 | errno); | |
274 | ||
275 | regs->skas.is_user = 1; | |
276 | save_registers(pid, regs); | |
277 | UPT_SYSCALL_NR(regs) = -1; /* Assume: It's not a syscall */ | |
278 | ||
279 | if(WIFSTOPPED(status)){ | |
280 | switch(WSTOPSIG(status)){ | |
281 | case SIGSEGV: | |
282 | if(PTRACE_FULL_FAULTINFO || !ptrace_faultinfo) | |
283 | user_signal(SIGSEGV, regs, pid); | |
284 | else handle_segv(pid, regs); | |
285 | break; | |
286 | case SIGTRAP + 0x80: | |
287 | handle_trap(pid, regs, local_using_sysemu); | |
288 | break; | |
289 | case SIGTRAP: | |
290 | relay_signal(SIGTRAP, regs); | |
291 | break; | |
292 | case SIGIO: | |
293 | case SIGVTALRM: | |
294 | case SIGILL: | |
295 | case SIGBUS: | |
296 | case SIGFPE: | |
297 | case SIGWINCH: | |
298 | user_signal(WSTOPSIG(status), regs, pid); | |
299 | break; | |
300 | default: | |
301 | printk("userspace - child stopped with signal " | |
302 | "%d\n", WSTOPSIG(status)); | |
303 | } | |
abaf6977 GS |
304 | pid = userspace_pid[0]; |
305 | interrupt_end(); | |
306 | ||
307 | /* Avoid -ERESTARTSYS handling in host */ | |
308 | if(PT_SYSCALL_NR_OFFSET != PT_SYSCALL_RET_OFFSET) | |
309 | PT_SYSCALL_NR(regs->skas.regs) = -1; | |
310 | } | |
311 | } | |
312 | } | |
abaf6977 GS |
313 | |
314 | int copy_context_skas0(unsigned long new_stack, int pid) | |
315 | { | |
316 | int err; | |
e2216feb JD |
317 | unsigned long regs[HOST_FRAME_SIZE]; |
318 | unsigned long fp_regs[HOST_FP_SIZE]; | |
abaf6977 GS |
319 | unsigned long current_stack = current_stub_stack(); |
320 | struct stub_data *data = (struct stub_data *) current_stack; | |
321 | struct stub_data *child_data = (struct stub_data *) new_stack; | |
322 | __u64 new_offset; | |
323 | int new_fd = phys_mapping(to_phys((void *)new_stack), &new_offset); | |
324 | ||
325 | /* prepare offset and fd of child's stack as argument for parent's | |
326 | * and child's mmap2 calls | |
327 | */ | |
328 | *data = ((struct stub_data) { .offset = MMAP_OFFSET(new_offset), | |
329 | .fd = new_fd, | |
330 | .timer = ((struct itimerval) | |
331 | { { 0, 1000000 / hz() }, | |
332 | { 0, 1000000 / hz() }})}); | |
e2216feb | 333 | get_safe_registers(regs, fp_regs); |
abaf6977 GS |
334 | |
335 | /* Set parent's instruction pointer to start of clone-stub */ | |
336 | regs[REGS_IP_INDEX] = UML_CONFIG_STUB_CODE + | |
337 | (unsigned long) stub_clone_handler - | |
338 | (unsigned long) &__syscall_stub_start; | |
339 | regs[REGS_SP_INDEX] = UML_CONFIG_STUB_DATA + PAGE_SIZE - | |
340 | sizeof(void *); | |
341 | #ifdef __SIGNAL_FRAMESIZE | |
342 | regs[REGS_SP_INDEX] -= __SIGNAL_FRAMESIZE; | |
343 | #endif | |
344 | err = ptrace_setregs(pid, regs); | |
345 | if(err < 0) | |
346 | panic("copy_context_skas0 : PTRACE_SETREGS failed, " | |
2ace87b9 | 347 | "pid = %d, errno = %d\n", pid, -err); |
abaf6977 | 348 | |
e2216feb JD |
349 | err = ptrace_setfpregs(pid, fp_regs); |
350 | if(err < 0) | |
351 | panic("copy_context_skas0 : PTRACE_SETFPREGS failed, " | |
2ace87b9 | 352 | "pid = %d, errno = %d\n", pid, -err); |
e2216feb | 353 | |
abaf6977 GS |
354 | /* set a well known return code for detection of child write failure */ |
355 | child_data->err = 12345678; | |
356 | ||
357 | /* Wait, until parent has finished its work: read child's pid from | |
358 | * parent's stack, and check, if bad result. | |
359 | */ | |
360 | wait_stub_done(pid, 0, "copy_context_skas0"); | |
361 | ||
362 | pid = data->err; | |
363 | if(pid < 0) | |
364 | panic("copy_context_skas0 - stub-parent reports error %d\n", | |
2ace87b9 | 365 | -pid); |
abaf6977 GS |
366 | |
367 | /* Wait, until child has finished too: read child's result from | |
368 | * child's stack and check it. | |
369 | */ | |
370 | wait_stub_done(pid, -1, "copy_context_skas0"); | |
371 | if (child_data->err != UML_CONFIG_STUB_DATA) | |
802e3077 | 372 | panic("copy_context_skas0 - stub-child reports error %ld\n", |
abaf6977 GS |
373 | child_data->err); |
374 | ||
375 | if (ptrace(PTRACE_OLDSETOPTIONS, pid, NULL, | |
376 | (void *)PTRACE_O_TRACESYSGOOD) < 0) | |
377 | panic("copy_context_skas0 : PTRACE_OLDSETOPTIONS failed, " | |
378 | "errno = %d\n", errno); | |
379 | ||
380 | return pid; | |
381 | } | |
382 | ||
383 | /* | |
384 | * This is used only, if stub pages are needed, while proc_mm is | |
385 | * availabl. Opening /proc/mm creates a new mm_context, which lacks | |
386 | * the stub-pages. Thus, we map them using /proc/mm-fd | |
387 | */ | |
388 | void map_stub_pages(int fd, unsigned long code, | |
389 | unsigned long data, unsigned long stack) | |
390 | { | |
391 | struct proc_mm_op mmop; | |
392 | int n; | |
09ee011e JD |
393 | __u64 code_offset; |
394 | int code_fd = phys_mapping(to_phys((void *) &__syscall_stub_start), | |
395 | &code_offset); | |
abaf6977 GS |
396 | |
397 | mmop = ((struct proc_mm_op) { .op = MM_MMAP, | |
398 | .u = | |
399 | { .mmap = | |
400 | { .addr = code, | |
401 | .len = PAGE_SIZE, | |
402 | .prot = PROT_EXEC, | |
403 | .flags = MAP_FIXED | MAP_PRIVATE, | |
09ee011e JD |
404 | .fd = code_fd, |
405 | .offset = code_offset | |
abaf6977 GS |
406 | } } }); |
407 | n = os_write_file(fd, &mmop, sizeof(mmop)); | |
408 | if(n != sizeof(mmop)) | |
409 | panic("map_stub_pages : /proc/mm map for code failed, " | |
410 | "err = %d\n", -n); | |
411 | ||
412 | if ( stack ) { | |
413 | __u64 map_offset; | |
414 | int map_fd = phys_mapping(to_phys((void *)stack), &map_offset); | |
415 | mmop = ((struct proc_mm_op) | |
416 | { .op = MM_MMAP, | |
417 | .u = | |
418 | { .mmap = | |
419 | { .addr = data, | |
420 | .len = PAGE_SIZE, | |
421 | .prot = PROT_READ | PROT_WRITE, | |
422 | .flags = MAP_FIXED | MAP_SHARED, | |
423 | .fd = map_fd, | |
424 | .offset = map_offset | |
425 | } } }); | |
426 | n = os_write_file(fd, &mmop, sizeof(mmop)); | |
427 | if(n != sizeof(mmop)) | |
428 | panic("map_stub_pages : /proc/mm map for data failed, " | |
429 | "err = %d\n", -n); | |
430 | } | |
431 | } | |
432 | ||
433 | void new_thread(void *stack, void **switch_buf_ptr, void **fork_buf_ptr, | |
434 | void (*handler)(int)) | |
435 | { | |
436 | unsigned long flags; | |
ad28e029 | 437 | jmp_buf switch_buf, fork_buf; |
1d7173ba | 438 | int enable; |
abaf6977 GS |
439 | |
440 | *switch_buf_ptr = &switch_buf; | |
441 | *fork_buf_ptr = &fork_buf; | |
442 | ||
443 | /* Somewhat subtle - siglongjmp restores the signal mask before doing | |
444 | * the longjmp. This means that when jumping from one stack to another | |
445 | * when the target stack has interrupts enabled, an interrupt may occur | |
446 | * on the source stack. This is bad when starting up a process because | |
447 | * it's not supposed to get timer ticks until it has been scheduled. | |
448 | * So, we disable interrupts around the sigsetjmp to ensure that | |
449 | * they can't happen until we get back here where they are safe. | |
450 | */ | |
451 | flags = get_signals(); | |
452 | block_signals(); | |
ad28e029 | 453 | if(UML_SETJMP(&fork_buf, enable) == 0) |
abaf6977 GS |
454 | new_thread_proc(stack, handler); |
455 | ||
456 | remove_sigstack(); | |
457 | ||
458 | set_signals(flags); | |
459 | } | |
460 | ||
e2216feb JD |
461 | #define INIT_JMP_NEW_THREAD 0 |
462 | #define INIT_JMP_REMOVE_SIGSTACK 1 | |
463 | #define INIT_JMP_CALLBACK 2 | |
464 | #define INIT_JMP_HALT 3 | |
465 | #define INIT_JMP_REBOOT 4 | |
466 | ||
abaf6977 GS |
467 | void thread_wait(void *sw, void *fb) |
468 | { | |
ad28e029 | 469 | jmp_buf buf, **switch_buf = sw, *fork_buf; |
1d7173ba | 470 | int enable; |
abaf6977 GS |
471 | |
472 | *switch_buf = &buf; | |
473 | fork_buf = fb; | |
ad28e029 | 474 | if(UML_SETJMP(&buf, enable) == 0) |
abaf6977 GS |
475 | siglongjmp(*fork_buf, INIT_JMP_REMOVE_SIGSTACK); |
476 | } | |
477 | ||
478 | void switch_threads(void *me, void *next) | |
479 | { | |
ad28e029 | 480 | jmp_buf my_buf, **me_ptr = me, *next_buf = next; |
1d7173ba | 481 | int enable; |
abaf6977 GS |
482 | |
483 | *me_ptr = &my_buf; | |
ad28e029 JD |
484 | if(UML_SETJMP(&my_buf, enable) == 0) |
485 | UML_LONGJMP(next_buf, 1); | |
abaf6977 GS |
486 | } |
487 | ||
ad28e029 | 488 | static jmp_buf initial_jmpbuf; |
abaf6977 GS |
489 | |
490 | /* XXX Make these percpu */ | |
491 | static void (*cb_proc)(void *arg); | |
492 | static void *cb_arg; | |
ad28e029 | 493 | static jmp_buf *cb_back; |
abaf6977 GS |
494 | |
495 | int start_idle_thread(void *stack, void *switch_buf_ptr, void **fork_buf_ptr) | |
496 | { | |
ad28e029 | 497 | jmp_buf **switch_buf = switch_buf_ptr; |
1d7173ba | 498 | int n, enable; |
abaf6977 GS |
499 | |
500 | set_handler(SIGWINCH, (__sighandler_t) sig_handler, | |
501 | SA_ONSTACK | SA_RESTART, SIGUSR1, SIGIO, SIGALRM, | |
502 | SIGVTALRM, -1); | |
503 | ||
504 | *fork_buf_ptr = &initial_jmpbuf; | |
ad28e029 | 505 | n = UML_SETJMP(&initial_jmpbuf, enable); |
abaf6977 GS |
506 | switch(n){ |
507 | case INIT_JMP_NEW_THREAD: | |
508 | new_thread_proc((void *) stack, new_thread_handler); | |
509 | break; | |
510 | case INIT_JMP_REMOVE_SIGSTACK: | |
511 | remove_sigstack(); | |
512 | break; | |
513 | case INIT_JMP_CALLBACK: | |
514 | (*cb_proc)(cb_arg); | |
ad28e029 | 515 | UML_LONGJMP(cb_back, 1); |
abaf6977 GS |
516 | break; |
517 | case INIT_JMP_HALT: | |
518 | kmalloc_ok = 0; | |
519 | return(0); | |
520 | case INIT_JMP_REBOOT: | |
521 | kmalloc_ok = 0; | |
522 | return(1); | |
523 | default: | |
524 | panic("Bad sigsetjmp return in start_idle_thread - %d\n", n); | |
525 | } | |
ad28e029 | 526 | UML_LONGJMP(*switch_buf, 1); |
abaf6977 GS |
527 | } |
528 | ||
529 | void initial_thread_cb_skas(void (*proc)(void *), void *arg) | |
530 | { | |
ad28e029 | 531 | jmp_buf here; |
1d7173ba | 532 | int enable; |
abaf6977 GS |
533 | |
534 | cb_proc = proc; | |
535 | cb_arg = arg; | |
536 | cb_back = &here; | |
537 | ||
538 | block_signals(); | |
ad28e029 JD |
539 | if(UML_SETJMP(&here, enable) == 0) |
540 | UML_LONGJMP(&initial_jmpbuf, INIT_JMP_CALLBACK); | |
abaf6977 GS |
541 | unblock_signals(); |
542 | ||
543 | cb_proc = NULL; | |
544 | cb_arg = NULL; | |
545 | cb_back = NULL; | |
546 | } | |
547 | ||
548 | void halt_skas(void) | |
549 | { | |
550 | block_signals(); | |
ad28e029 | 551 | UML_LONGJMP(&initial_jmpbuf, INIT_JMP_HALT); |
abaf6977 GS |
552 | } |
553 | ||
554 | void reboot_skas(void) | |
555 | { | |
556 | block_signals(); | |
ad28e029 | 557 | UML_LONGJMP(&initial_jmpbuf, INIT_JMP_REBOOT); |
abaf6977 GS |
558 | } |
559 | ||
560 | void switch_mm_skas(struct mm_id *mm_idp) | |
561 | { | |
562 | int err; | |
563 | ||
564 | #warning need cpu pid in switch_mm_skas | |
565 | if(proc_mm){ | |
566 | err = ptrace(PTRACE_SWITCH_MM, userspace_pid[0], 0, | |
567 | mm_idp->u.mm_fd); | |
568 | if(err) | |
569 | panic("switch_mm_skas - PTRACE_SWITCH_MM failed, " | |
570 | "errno = %d\n", errno); | |
571 | } | |
572 | else userspace_pid[0] = mm_idp->u.pid; | |
573 | } |