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