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