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60d339f6 GS |
1 | /* |
2 | * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com) | |
3 | * Licensed under the GPL | |
4 | */ | |
5 | ||
6 | #include <stdio.h> | |
7 | #include <unistd.h> | |
8 | #include <signal.h> | |
9 | #include <sched.h> | |
10 | #include <errno.h> | |
11 | #include <stdarg.h> | |
12 | #include <stdlib.h> | |
60d339f6 GS |
13 | #include <sys/time.h> |
14 | #include <sys/ptrace.h> | |
15 | #include <linux/ptrace.h> | |
16 | #include <sys/wait.h> | |
17 | #include <sys/mman.h> | |
18 | #include <asm/ptrace.h> | |
19 | #include <asm/unistd.h> | |
20 | #include <asm/page.h> | |
60d339f6 GS |
21 | #include "kern_util.h" |
22 | #include "user.h" | |
23 | #include "signal_kern.h" | |
60d339f6 GS |
24 | #include "sysdep/ptrace.h" |
25 | #include "sysdep/sigcontext.h" | |
26 | #include "irq_user.h" | |
27 | #include "ptrace_user.h" | |
60d339f6 GS |
28 | #include "init.h" |
29 | #include "os.h" | |
30 | #include "uml-config.h" | |
31 | #include "choose-mode.h" | |
32 | #include "mode.h" | |
33 | #include "tempfile.h" | |
1ffb9164 | 34 | #include "kern_constants.h" |
60d339f6 | 35 | |
0f80bc85 JD |
36 | int protect_memory(unsigned long addr, unsigned long len, int r, int w, int x, |
37 | int must_succeed) | |
38 | { | |
39 | int err; | |
40 | ||
41 | err = os_protect_memory((void *) addr, len, r, w, x); | |
42 | if(err < 0){ | |
43 | if(must_succeed) | |
44 | panic("protect failed, err = %d", -err); | |
45 | else return(err); | |
46 | } | |
47 | return(0); | |
48 | } | |
49 | ||
ea2ba7dc GS |
50 | void kill_child_dead(int pid) |
51 | { | |
52 | kill(pid, SIGKILL); | |
53 | kill(pid, SIGCONT); | |
54 | do { | |
55 | int n; | |
56 | CATCH_EINTR(n = waitpid(pid, NULL, 0)); | |
57 | if (n > 0) | |
58 | kill(pid, SIGCONT); | |
59 | else | |
60 | break; | |
61 | } while(1); | |
62 | } | |
63 | ||
4fef0c10 GS |
64 | void stop(void) |
65 | { | |
66 | while(1) sleep(1000000); | |
67 | } | |
68 | ||
69 | int wait_for_stop(int pid, int sig, int cont_type, void *relay) | |
70 | { | |
71 | sigset_t *relay_signals = relay; | |
72 | int status, ret; | |
73 | ||
74 | while(1){ | |
75 | CATCH_EINTR(ret = waitpid(pid, &status, WUNTRACED)); | |
76 | if((ret < 0) || | |
77 | !WIFSTOPPED(status) || (WSTOPSIG(status) != sig)){ | |
78 | if(ret < 0){ | |
79 | printk("wait failed, errno = %d\n", | |
80 | errno); | |
81 | } | |
82 | else if(WIFEXITED(status)) | |
83 | printk("process %d exited with status %d\n", | |
84 | pid, WEXITSTATUS(status)); | |
85 | else if(WIFSIGNALED(status)) | |
86 | printk("process %d exited with signal %d\n", | |
87 | pid, WTERMSIG(status)); | |
88 | else if((WSTOPSIG(status) == SIGVTALRM) || | |
89 | (WSTOPSIG(status) == SIGALRM) || | |
90 | (WSTOPSIG(status) == SIGIO) || | |
91 | (WSTOPSIG(status) == SIGPROF) || | |
92 | (WSTOPSIG(status) == SIGCHLD) || | |
93 | (WSTOPSIG(status) == SIGWINCH) || | |
94 | (WSTOPSIG(status) == SIGINT)){ | |
95 | ptrace(cont_type, pid, 0, WSTOPSIG(status)); | |
96 | continue; | |
97 | } | |
98 | else if((relay_signals != NULL) && | |
99 | sigismember(relay_signals, WSTOPSIG(status))){ | |
100 | ptrace(cont_type, pid, 0, WSTOPSIG(status)); | |
101 | continue; | |
102 | } | |
103 | else printk("process %d stopped with signal %d\n", | |
104 | pid, WSTOPSIG(status)); | |
105 | panic("wait_for_stop failed to wait for %d to stop " | |
106 | "with %d\n", pid, sig); | |
107 | } | |
108 | return(status); | |
109 | } | |
110 | } | |
111 | ||
63ae2a94 JD |
112 | void forward_ipi(int fd, int pid) |
113 | { | |
114 | int err; | |
115 | ||
116 | err = os_set_owner(fd, pid); | |
117 | if(err < 0) | |
118 | printk("forward_ipi: set_owner failed, fd = %d, me = %d, " | |
119 | "target = %d, err = %d\n", fd, os_getpid(), pid, -err); | |
120 | } | |
121 | ||
60d339f6 GS |
122 | /* |
123 | *------------------------- | |
124 | * only for tt mode (will be deleted in future...) | |
125 | *------------------------- | |
126 | */ | |
127 | ||
128 | struct tramp { | |
129 | int (*tramp)(void *); | |
130 | void *tramp_data; | |
131 | unsigned long temp_stack; | |
132 | int flags; | |
133 | int pid; | |
134 | }; | |
135 | ||
136 | /* See above for why sigkill is here */ | |
137 | ||
138 | int sigkill = SIGKILL; | |
139 | ||
140 | int outer_tramp(void *arg) | |
141 | { | |
142 | struct tramp *t; | |
143 | int sig = sigkill; | |
144 | ||
145 | t = arg; | |
1ffb9164 | 146 | t->pid = clone(t->tramp, (void *) t->temp_stack + UM_KERN_PAGE_SIZE/2, |
60d339f6 GS |
147 | t->flags, t->tramp_data); |
148 | if(t->pid > 0) wait_for_stop(t->pid, SIGSTOP, PTRACE_CONT, NULL); | |
149 | kill(os_getpid(), sig); | |
150 | _exit(0); | |
151 | } | |
152 | ||
153 | int start_fork_tramp(void *thread_arg, unsigned long temp_stack, | |
154 | int clone_flags, int (*tramp)(void *)) | |
155 | { | |
156 | struct tramp arg; | |
157 | unsigned long sp; | |
158 | int new_pid, status, err; | |
159 | ||
160 | /* The trampoline will run on the temporary stack */ | |
161 | sp = stack_sp(temp_stack); | |
162 | ||
163 | clone_flags |= CLONE_FILES | SIGCHLD; | |
164 | ||
165 | arg.tramp = tramp; | |
166 | arg.tramp_data = thread_arg; | |
167 | arg.temp_stack = temp_stack; | |
168 | arg.flags = clone_flags; | |
169 | ||
170 | /* Start the process and wait for it to kill itself */ | |
171 | new_pid = clone(outer_tramp, (void *) sp, clone_flags, &arg); | |
172 | if(new_pid < 0) | |
173 | return(new_pid); | |
174 | ||
175 | CATCH_EINTR(err = waitpid(new_pid, &status, 0)); | |
176 | if(err < 0) | |
177 | panic("Waiting for outer trampoline failed - errno = %d", | |
178 | errno); | |
179 | ||
180 | if(!WIFSIGNALED(status) || (WTERMSIG(status) != SIGKILL)) | |
181 | panic("outer trampoline didn't exit with SIGKILL, " | |
182 | "status = %d", status); | |
183 | ||
184 | return(arg.pid); | |
185 | } | |
186 | ||
187 | void forward_pending_sigio(int target) | |
188 | { | |
189 | sigset_t sigs; | |
190 | ||
191 | if(sigpending(&sigs)) | |
192 | panic("forward_pending_sigio : sigpending failed"); | |
193 | if(sigismember(&sigs, SIGIO)) | |
194 | kill(target, SIGIO); | |
195 | } | |
196 |