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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> | |
abaf6977 GS |
11 | #include <sched.h> |
12 | #include "ptrace_user.h" | |
13 | #include <sys/wait.h> | |
14 | #include <sys/mman.h> | |
15 | #include <sys/user.h> | |
16 | #include <sys/time.h> | |
1f6f6164 | 17 | #include <sys/syscall.h> |
abaf6977 GS |
18 | #include <asm/types.h> |
19 | #include "user.h" | |
20 | #include "sysdep/ptrace.h" | |
abaf6977 GS |
21 | #include "kern_util.h" |
22 | #include "skas.h" | |
23 | #include "stub-data.h" | |
24 | #include "mm_id.h" | |
25 | #include "sysdep/sigcontext.h" | |
26 | #include "sysdep/stub.h" | |
27 | #include "os.h" | |
28 | #include "proc_mm.h" | |
29 | #include "skas_ptrace.h" | |
30 | #include "chan_user.h" | |
31 | #include "registers.h" | |
32 | #include "mem.h" | |
33 | #include "uml-config.h" | |
34 | #include "process.h" | |
1d7173ba | 35 | #include "longjmp.h" |
1ffb9164 | 36 | #include "kern_constants.h" |
abaf6977 GS |
37 | |
38 | int is_skas_winch(int pid, int fd, void *data) | |
39 | { | |
40 | if(pid != os_getpgrp()) | |
41 | return(0); | |
42 | ||
43 | register_winch_irq(-1, fd, -1, data); | |
44 | return(1); | |
45 | } | |
46 | ||
f30c2c98 JD |
47 | static int ptrace_dump_regs(int pid) |
48 | { | |
49 | unsigned long regs[MAX_REG_NR]; | |
50 | int i; | |
51 | ||
52 | if(ptrace(PTRACE_GETREGS, pid, 0, regs) < 0) | |
53 | return -errno; | |
54 | else { | |
55 | printk("Stub registers -\n"); | |
56 | for(i = 0; i < ARRAY_SIZE(regs); i++) | |
57 | printk("\t%d - %lx\n", i, regs[i]); | |
58 | } | |
59 | ||
60 | return 0; | |
61 | } | |
62 | ||
abaf6977 GS |
63 | void wait_stub_done(int pid, int sig, char * fname) |
64 | { | |
65 | int n, status, err; | |
66 | ||
67 | do { | |
68 | if ( sig != -1 ) { | |
69 | err = ptrace(PTRACE_CONT, pid, 0, sig); | |
70 | if(err) | |
71 | panic("%s : continue failed, errno = %d\n", | |
72 | fname, errno); | |
73 | } | |
74 | sig = 0; | |
75 | ||
76 | CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED)); | |
77 | } while((n >= 0) && WIFSTOPPED(status) && | |
78 | ((WSTOPSIG(status) == SIGVTALRM) || | |
79 | /* running UML inside a detached screen can cause | |
80 | * SIGWINCHes | |
81 | */ | |
82 | (WSTOPSIG(status) == SIGWINCH))); | |
83 | ||
84 | if((n < 0) || !WIFSTOPPED(status) || | |
85 | (WSTOPSIG(status) != SIGUSR1 && WSTOPSIG(status) != SIGTRAP)){ | |
f30c2c98 JD |
86 | err = ptrace_dump_regs(pid); |
87 | if(err) | |
abaf6977 | 88 | printk("Failed to get registers from stub, " |
f30c2c98 | 89 | "errno = %d\n", -err); |
abaf6977 GS |
90 | panic("%s : failed to wait for SIGUSR1/SIGTRAP, " |
91 | "pid = %d, n = %d, errno = %d, status = 0x%x\n", | |
92 | fname, pid, n, errno, status); | |
93 | } | |
94 | } | |
95 | ||
96 | extern unsigned long current_stub_stack(void); | |
97 | ||
98 | void get_skas_faultinfo(int pid, struct faultinfo * fi) | |
99 | { | |
100 | int err; | |
101 | ||
102 | if(ptrace_faultinfo){ | |
103 | err = ptrace(PTRACE_FAULTINFO, pid, 0, fi); | |
104 | if(err) | |
105 | panic("get_skas_faultinfo - PTRACE_FAULTINFO failed, " | |
106 | "errno = %d\n", errno); | |
107 | ||
108 | /* Special handling for i386, which has different structs */ | |
109 | if (sizeof(struct ptrace_faultinfo) < sizeof(struct faultinfo)) | |
110 | memset((char *)fi + sizeof(struct ptrace_faultinfo), 0, | |
111 | sizeof(struct faultinfo) - | |
112 | sizeof(struct ptrace_faultinfo)); | |
113 | } | |
114 | else { | |
115 | wait_stub_done(pid, SIGSEGV, "get_skas_faultinfo"); | |
116 | ||
117 | /* faultinfo is prepared by the stub-segv-handler at start of | |
118 | * the stub stack page. We just have to copy it. | |
119 | */ | |
120 | memcpy(fi, (void *)current_stub_stack(), sizeof(*fi)); | |
121 | } | |
122 | } | |
123 | ||
124 | static void handle_segv(int pid, union uml_pt_regs * regs) | |
125 | { | |
126 | get_skas_faultinfo(pid, ®s->skas.faultinfo); | |
127 | segv(regs->skas.faultinfo, 0, 1, NULL); | |
128 | } | |
129 | ||
130 | /*To use the same value of using_sysemu as the caller, ask it that value (in local_using_sysemu)*/ | |
131 | static void handle_trap(int pid, union uml_pt_regs *regs, int local_using_sysemu) | |
132 | { | |
133 | int err, status; | |
134 | ||
135 | /* Mark this as a syscall */ | |
136 | UPT_SYSCALL_NR(regs) = PT_SYSCALL_NR(regs->skas.regs); | |
137 | ||
138 | if (!local_using_sysemu) | |
139 | { | |
140 | err = ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_NR_OFFSET, | |
141 | __NR_getpid); | |
142 | if(err < 0) | |
143 | panic("handle_trap - nullifying syscall failed errno = %d\n", | |
144 | errno); | |
145 | ||
146 | err = ptrace(PTRACE_SYSCALL, pid, 0, 0); | |
147 | if(err < 0) | |
148 | panic("handle_trap - continuing to end of syscall failed, " | |
149 | "errno = %d\n", errno); | |
150 | ||
151 | CATCH_EINTR(err = waitpid(pid, &status, WUNTRACED)); | |
152 | if((err < 0) || !WIFSTOPPED(status) || | |
f30c2c98 JD |
153 | (WSTOPSIG(status) != SIGTRAP + 0x80)){ |
154 | err = ptrace_dump_regs(pid); | |
155 | if(err) | |
156 | printk("Failed to get registers from process, " | |
157 | "errno = %d\n", -err); | |
abaf6977 GS |
158 | panic("handle_trap - failed to wait at end of syscall, " |
159 | "errno = %d, status = %d\n", errno, status); | |
f30c2c98 | 160 | } |
abaf6977 GS |
161 | } |
162 | ||
163 | handle_syscall(regs); | |
164 | } | |
165 | ||
166 | extern int __syscall_stub_start; | |
abaf6977 GS |
167 | |
168 | static int userspace_tramp(void *stack) | |
169 | { | |
170 | void *addr; | |
537ae946 | 171 | int err; |
abaf6977 GS |
172 | |
173 | ptrace(PTRACE_TRACEME, 0, 0, 0); | |
174 | ||
e64bd134 | 175 | init_new_thread_signals(); |
537ae946 JD |
176 | err = set_interval(1); |
177 | if(err) | |
178 | panic("userspace_tramp - setting timer failed, errno = %d\n", | |
179 | err); | |
abaf6977 GS |
180 | |
181 | if(!proc_mm){ | |
182 | /* This has a pte, but it can't be mapped in with the usual | |
183 | * tlb_flush mechanism because this is part of that mechanism | |
184 | */ | |
09ee011e JD |
185 | int fd; |
186 | __u64 offset; | |
187 | fd = phys_mapping(to_phys(&__syscall_stub_start), &offset); | |
1ffb9164 | 188 | addr = mmap64((void *) UML_CONFIG_STUB_CODE, UM_KERN_PAGE_SIZE, |
09ee011e | 189 | PROT_EXEC, MAP_FIXED | MAP_PRIVATE, fd, offset); |
abaf6977 | 190 | if(addr == MAP_FAILED){ |
09ee011e | 191 | printk("mapping mmap stub failed, errno = %d\n", |
abaf6977 GS |
192 | errno); |
193 | exit(1); | |
194 | } | |
195 | ||
196 | if(stack != NULL){ | |
abaf6977 | 197 | fd = phys_mapping(to_phys(stack), &offset); |
1ffb9164 JD |
198 | addr = mmap((void *) UML_CONFIG_STUB_DATA, |
199 | UM_KERN_PAGE_SIZE, PROT_READ | PROT_WRITE, | |
abaf6977 GS |
200 | MAP_FIXED | MAP_SHARED, fd, offset); |
201 | if(addr == MAP_FAILED){ | |
09ee011e | 202 | printk("mapping segfault stack failed, " |
abaf6977 GS |
203 | "errno = %d\n", errno); |
204 | exit(1); | |
205 | } | |
206 | } | |
207 | } | |
09ee011e | 208 | if(!ptrace_faultinfo && (stack != NULL)){ |
4b84c69b JD |
209 | struct sigaction sa; |
210 | ||
abaf6977 GS |
211 | unsigned long v = UML_CONFIG_STUB_CODE + |
212 | (unsigned long) stub_segv_handler - | |
213 | (unsigned long) &__syscall_stub_start; | |
214 | ||
1ffb9164 | 215 | set_sigstack((void *) UML_CONFIG_STUB_DATA, UM_KERN_PAGE_SIZE); |
4b84c69b JD |
216 | sigemptyset(&sa.sa_mask); |
217 | sigaddset(&sa.sa_mask, SIGIO); | |
218 | sigaddset(&sa.sa_mask, SIGWINCH); | |
219 | sigaddset(&sa.sa_mask, SIGALRM); | |
220 | sigaddset(&sa.sa_mask, SIGVTALRM); | |
221 | sigaddset(&sa.sa_mask, SIGUSR1); | |
222 | sa.sa_flags = SA_ONSTACK; | |
223 | sa.sa_handler = (void *) v; | |
224 | sa.sa_restorer = NULL; | |
225 | if(sigaction(SIGSEGV, &sa, NULL) < 0) | |
226 | panic("userspace_tramp - setting SIGSEGV handler " | |
227 | "failed - errno = %d\n", errno); | |
abaf6977 GS |
228 | } |
229 | ||
230 | os_stop_process(os_getpid()); | |
231 | return(0); | |
232 | } | |
233 | ||
234 | /* Each element set once, and only accessed by a single processor anyway */ | |
235 | #undef NR_CPUS | |
236 | #define NR_CPUS 1 | |
237 | int userspace_pid[NR_CPUS]; | |
238 | ||
239 | int start_userspace(unsigned long stub_stack) | |
240 | { | |
241 | void *stack; | |
242 | unsigned long sp; | |
243 | int pid, status, n, flags; | |
244 | ||
abaf6977 GS |
245 | stack = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE | PROT_EXEC, |
246 | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); | |
247 | if(stack == MAP_FAILED) | |
248 | panic("start_userspace : mmap failed, errno = %d", errno); | |
249 | sp = (unsigned long) stack + PAGE_SIZE - sizeof(void *); | |
250 | ||
251 | flags = CLONE_FILES | SIGCHLD; | |
252 | if(proc_mm) flags |= CLONE_VM; | |
253 | pid = clone(userspace_tramp, (void *) sp, flags, (void *) stub_stack); | |
254 | if(pid < 0) | |
255 | panic("start_userspace : clone failed, errno = %d", errno); | |
256 | ||
257 | do { | |
258 | CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED)); | |
259 | if(n < 0) | |
260 | panic("start_userspace : wait failed, errno = %d", | |
261 | errno); | |
262 | } while(WIFSTOPPED(status) && (WSTOPSIG(status) == SIGVTALRM)); | |
263 | ||
264 | if(!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGSTOP)) | |
265 | panic("start_userspace : expected SIGSTOP, got status = %d", | |
266 | status); | |
267 | ||
268 | if (ptrace(PTRACE_OLDSETOPTIONS, pid, NULL, (void *)PTRACE_O_TRACESYSGOOD) < 0) | |
269 | panic("start_userspace : PTRACE_OLDSETOPTIONS failed, errno=%d\n", | |
270 | errno); | |
271 | ||
272 | if(munmap(stack, PAGE_SIZE) < 0) | |
273 | panic("start_userspace : munmap failed, errno = %d\n", errno); | |
274 | ||
275 | return(pid); | |
276 | } | |
277 | ||
278 | void userspace(union uml_pt_regs *regs) | |
279 | { | |
280 | int err, status, op, pid = userspace_pid[0]; | |
281 | int local_using_sysemu; /*To prevent races if using_sysemu changes under us.*/ | |
282 | ||
283 | while(1){ | |
284 | restore_registers(pid, regs); | |
285 | ||
286 | /* Now we set local_using_sysemu to be used for one loop */ | |
287 | local_using_sysemu = get_using_sysemu(); | |
288 | ||
289 | op = SELECT_PTRACE_OPERATION(local_using_sysemu, singlestepping(NULL)); | |
290 | ||
291 | err = ptrace(op, pid, 0, 0); | |
292 | if(err) | |
293 | panic("userspace - could not resume userspace process, " | |
294 | "pid=%d, ptrace operation = %d, errno = %d\n", | |
802e3077 | 295 | pid, op, errno); |
abaf6977 GS |
296 | |
297 | CATCH_EINTR(err = waitpid(pid, &status, WUNTRACED)); | |
298 | if(err < 0) | |
299 | panic("userspace - waitpid failed, errno = %d\n", | |
300 | errno); | |
301 | ||
302 | regs->skas.is_user = 1; | |
303 | save_registers(pid, regs); | |
304 | UPT_SYSCALL_NR(regs) = -1; /* Assume: It's not a syscall */ | |
305 | ||
306 | if(WIFSTOPPED(status)){ | |
307 | switch(WSTOPSIG(status)){ | |
308 | case SIGSEGV: | |
309 | if(PTRACE_FULL_FAULTINFO || !ptrace_faultinfo) | |
310 | user_signal(SIGSEGV, regs, pid); | |
311 | else handle_segv(pid, regs); | |
312 | break; | |
313 | case SIGTRAP + 0x80: | |
314 | handle_trap(pid, regs, local_using_sysemu); | |
315 | break; | |
316 | case SIGTRAP: | |
317 | relay_signal(SIGTRAP, regs); | |
318 | break; | |
319 | case SIGIO: | |
320 | case SIGVTALRM: | |
321 | case SIGILL: | |
322 | case SIGBUS: | |
323 | case SIGFPE: | |
324 | case SIGWINCH: | |
325 | user_signal(WSTOPSIG(status), regs, pid); | |
326 | break; | |
327 | default: | |
328 | printk("userspace - child stopped with signal " | |
329 | "%d\n", WSTOPSIG(status)); | |
330 | } | |
abaf6977 GS |
331 | pid = userspace_pid[0]; |
332 | interrupt_end(); | |
333 | ||
334 | /* Avoid -ERESTARTSYS handling in host */ | |
335 | if(PT_SYSCALL_NR_OFFSET != PT_SYSCALL_RET_OFFSET) | |
336 | PT_SYSCALL_NR(regs->skas.regs) = -1; | |
337 | } | |
338 | } | |
339 | } | |
abaf6977 GS |
340 | |
341 | int copy_context_skas0(unsigned long new_stack, int pid) | |
342 | { | |
343 | int err; | |
b92c4f92 | 344 | unsigned long regs[MAX_REG_NR]; |
e2216feb | 345 | unsigned long fp_regs[HOST_FP_SIZE]; |
abaf6977 GS |
346 | unsigned long current_stack = current_stub_stack(); |
347 | struct stub_data *data = (struct stub_data *) current_stack; | |
348 | struct stub_data *child_data = (struct stub_data *) new_stack; | |
349 | __u64 new_offset; | |
350 | int new_fd = phys_mapping(to_phys((void *)new_stack), &new_offset); | |
351 | ||
352 | /* prepare offset and fd of child's stack as argument for parent's | |
353 | * and child's mmap2 calls | |
354 | */ | |
355 | *data = ((struct stub_data) { .offset = MMAP_OFFSET(new_offset), | |
356 | .fd = new_fd, | |
357 | .timer = ((struct itimerval) | |
358 | { { 0, 1000000 / hz() }, | |
359 | { 0, 1000000 / hz() }})}); | |
e2216feb | 360 | get_safe_registers(regs, fp_regs); |
abaf6977 GS |
361 | |
362 | /* Set parent's instruction pointer to start of clone-stub */ | |
363 | regs[REGS_IP_INDEX] = UML_CONFIG_STUB_CODE + | |
364 | (unsigned long) stub_clone_handler - | |
365 | (unsigned long) &__syscall_stub_start; | |
366 | regs[REGS_SP_INDEX] = UML_CONFIG_STUB_DATA + PAGE_SIZE - | |
367 | sizeof(void *); | |
368 | #ifdef __SIGNAL_FRAMESIZE | |
369 | regs[REGS_SP_INDEX] -= __SIGNAL_FRAMESIZE; | |
370 | #endif | |
371 | err = ptrace_setregs(pid, regs); | |
372 | if(err < 0) | |
373 | panic("copy_context_skas0 : PTRACE_SETREGS failed, " | |
2ace87b9 | 374 | "pid = %d, errno = %d\n", pid, -err); |
abaf6977 | 375 | |
e2216feb JD |
376 | err = ptrace_setfpregs(pid, fp_regs); |
377 | if(err < 0) | |
378 | panic("copy_context_skas0 : PTRACE_SETFPREGS failed, " | |
2ace87b9 | 379 | "pid = %d, errno = %d\n", pid, -err); |
e2216feb | 380 | |
abaf6977 GS |
381 | /* set a well known return code for detection of child write failure */ |
382 | child_data->err = 12345678; | |
383 | ||
384 | /* Wait, until parent has finished its work: read child's pid from | |
385 | * parent's stack, and check, if bad result. | |
386 | */ | |
387 | wait_stub_done(pid, 0, "copy_context_skas0"); | |
388 | ||
389 | pid = data->err; | |
390 | if(pid < 0) | |
391 | panic("copy_context_skas0 - stub-parent reports error %d\n", | |
2ace87b9 | 392 | -pid); |
abaf6977 GS |
393 | |
394 | /* Wait, until child has finished too: read child's result from | |
395 | * child's stack and check it. | |
396 | */ | |
397 | wait_stub_done(pid, -1, "copy_context_skas0"); | |
398 | if (child_data->err != UML_CONFIG_STUB_DATA) | |
802e3077 | 399 | panic("copy_context_skas0 - stub-child reports error %ld\n", |
abaf6977 GS |
400 | child_data->err); |
401 | ||
402 | if (ptrace(PTRACE_OLDSETOPTIONS, pid, NULL, | |
403 | (void *)PTRACE_O_TRACESYSGOOD) < 0) | |
404 | panic("copy_context_skas0 : PTRACE_OLDSETOPTIONS failed, " | |
405 | "errno = %d\n", errno); | |
406 | ||
407 | return pid; | |
408 | } | |
409 | ||
410 | /* | |
411 | * This is used only, if stub pages are needed, while proc_mm is | |
ef0470c0 | 412 | * available. Opening /proc/mm creates a new mm_context, which lacks |
abaf6977 GS |
413 | * the stub-pages. Thus, we map them using /proc/mm-fd |
414 | */ | |
415 | void map_stub_pages(int fd, unsigned long code, | |
416 | unsigned long data, unsigned long stack) | |
417 | { | |
418 | struct proc_mm_op mmop; | |
419 | int n; | |
09ee011e JD |
420 | __u64 code_offset; |
421 | int code_fd = phys_mapping(to_phys((void *) &__syscall_stub_start), | |
422 | &code_offset); | |
abaf6977 GS |
423 | |
424 | mmop = ((struct proc_mm_op) { .op = MM_MMAP, | |
425 | .u = | |
426 | { .mmap = | |
427 | { .addr = code, | |
428 | .len = PAGE_SIZE, | |
429 | .prot = PROT_EXEC, | |
430 | .flags = MAP_FIXED | MAP_PRIVATE, | |
09ee011e JD |
431 | .fd = code_fd, |
432 | .offset = code_offset | |
abaf6977 | 433 | } } }); |
a61f334f | 434 | CATCH_EINTR(n = write(fd, &mmop, sizeof(mmop))); |
b4cf95c6 | 435 | if(n != sizeof(mmop)){ |
a61f334f | 436 | n = errno; |
b4cf95c6 JD |
437 | printk("mmap args - addr = 0x%lx, fd = %d, offset = %llx\n", |
438 | code, code_fd, (unsigned long long) code_offset); | |
abaf6977 | 439 | panic("map_stub_pages : /proc/mm map for code failed, " |
a61f334f | 440 | "err = %d\n", n); |
b4cf95c6 | 441 | } |
abaf6977 GS |
442 | |
443 | if ( stack ) { | |
444 | __u64 map_offset; | |
445 | int map_fd = phys_mapping(to_phys((void *)stack), &map_offset); | |
446 | mmop = ((struct proc_mm_op) | |
447 | { .op = MM_MMAP, | |
448 | .u = | |
449 | { .mmap = | |
450 | { .addr = data, | |
451 | .len = PAGE_SIZE, | |
452 | .prot = PROT_READ | PROT_WRITE, | |
453 | .flags = MAP_FIXED | MAP_SHARED, | |
454 | .fd = map_fd, | |
455 | .offset = map_offset | |
456 | } } }); | |
a61f334f | 457 | CATCH_EINTR(n = write(fd, &mmop, sizeof(mmop))); |
abaf6977 GS |
458 | if(n != sizeof(mmop)) |
459 | panic("map_stub_pages : /proc/mm map for data failed, " | |
a61f334f | 460 | "err = %d\n", errno); |
abaf6977 GS |
461 | } |
462 | } | |
463 | ||
3c917350 | 464 | void new_thread(void *stack, jmp_buf *buf, void (*handler)(void)) |
abaf6977 | 465 | { |
3c917350 JD |
466 | (*buf)[0].JB_IP = (unsigned long) handler; |
467 | (*buf)[0].JB_SP = (unsigned long) stack + | |
468 | (PAGE_SIZE << UML_CONFIG_KERNEL_STACK_ORDER) - sizeof(void *); | |
abaf6977 GS |
469 | } |
470 | ||
e2216feb | 471 | #define INIT_JMP_NEW_THREAD 0 |
3c917350 JD |
472 | #define INIT_JMP_CALLBACK 1 |
473 | #define INIT_JMP_HALT 2 | |
474 | #define INIT_JMP_REBOOT 3 | |
abaf6977 | 475 | |
3c917350 | 476 | void switch_threads(jmp_buf *me, jmp_buf *you) |
abaf6977 | 477 | { |
3c917350 JD |
478 | if(UML_SETJMP(me) == 0) |
479 | UML_LONGJMP(you, 1); | |
abaf6977 GS |
480 | } |
481 | ||
ad28e029 | 482 | static jmp_buf initial_jmpbuf; |
abaf6977 GS |
483 | |
484 | /* XXX Make these percpu */ | |
485 | static void (*cb_proc)(void *arg); | |
486 | static void *cb_arg; | |
ad28e029 | 487 | static jmp_buf *cb_back; |
abaf6977 | 488 | |
3c917350 | 489 | int start_idle_thread(void *stack, jmp_buf *switch_buf) |
abaf6977 | 490 | { |
a5df0d1a | 491 | int n; |
abaf6977 GS |
492 | |
493 | set_handler(SIGWINCH, (__sighandler_t) sig_handler, | |
494 | SA_ONSTACK | SA_RESTART, SIGUSR1, SIGIO, SIGALRM, | |
495 | SIGVTALRM, -1); | |
496 | ||
a5df0d1a | 497 | n = UML_SETJMP(&initial_jmpbuf); |
abaf6977 GS |
498 | switch(n){ |
499 | case INIT_JMP_NEW_THREAD: | |
3c917350 JD |
500 | (*switch_buf)[0].JB_IP = (unsigned long) new_thread_handler; |
501 | (*switch_buf)[0].JB_SP = (unsigned long) stack + | |
502 | (PAGE_SIZE << UML_CONFIG_KERNEL_STACK_ORDER) - | |
503 | sizeof(void *); | |
abaf6977 GS |
504 | break; |
505 | case INIT_JMP_CALLBACK: | |
506 | (*cb_proc)(cb_arg); | |
ad28e029 | 507 | UML_LONGJMP(cb_back, 1); |
abaf6977 GS |
508 | break; |
509 | case INIT_JMP_HALT: | |
510 | kmalloc_ok = 0; | |
511 | return(0); | |
512 | case INIT_JMP_REBOOT: | |
513 | kmalloc_ok = 0; | |
514 | return(1); | |
515 | default: | |
516 | panic("Bad sigsetjmp return in start_idle_thread - %d\n", n); | |
517 | } | |
3c917350 | 518 | UML_LONGJMP(switch_buf, 1); |
abaf6977 GS |
519 | } |
520 | ||
521 | void initial_thread_cb_skas(void (*proc)(void *), void *arg) | |
522 | { | |
ad28e029 | 523 | jmp_buf here; |
abaf6977 GS |
524 | |
525 | cb_proc = proc; | |
526 | cb_arg = arg; | |
527 | cb_back = &here; | |
528 | ||
529 | block_signals(); | |
a5df0d1a | 530 | if(UML_SETJMP(&here) == 0) |
ad28e029 | 531 | UML_LONGJMP(&initial_jmpbuf, INIT_JMP_CALLBACK); |
abaf6977 GS |
532 | unblock_signals(); |
533 | ||
534 | cb_proc = NULL; | |
535 | cb_arg = NULL; | |
536 | cb_back = NULL; | |
537 | } | |
538 | ||
539 | void halt_skas(void) | |
540 | { | |
541 | block_signals(); | |
ad28e029 | 542 | UML_LONGJMP(&initial_jmpbuf, INIT_JMP_HALT); |
abaf6977 GS |
543 | } |
544 | ||
545 | void reboot_skas(void) | |
546 | { | |
547 | block_signals(); | |
ad28e029 | 548 | UML_LONGJMP(&initial_jmpbuf, INIT_JMP_REBOOT); |
abaf6977 GS |
549 | } |
550 | ||
551 | void switch_mm_skas(struct mm_id *mm_idp) | |
552 | { | |
553 | int err; | |
554 | ||
555 | #warning need cpu pid in switch_mm_skas | |
556 | if(proc_mm){ | |
557 | err = ptrace(PTRACE_SWITCH_MM, userspace_pid[0], 0, | |
558 | mm_idp->u.mm_fd); | |
559 | if(err) | |
560 | panic("switch_mm_skas - PTRACE_SWITCH_MM failed, " | |
561 | "errno = %d\n", errno); | |
562 | } | |
563 | else userspace_pid[0] = mm_idp->u.pid; | |
564 | } |