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Commit | Line | Data |
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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" | |
30 | #include "time_user.h" | |
31 | #include "init.h" | |
32 | #include "os.h" | |
33 | #include "uml-config.h" | |
34 | #include "choose-mode.h" | |
35 | #include "mode.h" | |
36 | #include "tempfile.h" | |
37 | ||
0f80bc85 JD |
38 | int protect_memory(unsigned long addr, unsigned long len, int r, int w, int x, |
39 | int must_succeed) | |
40 | { | |
41 | int err; | |
42 | ||
43 | err = os_protect_memory((void *) addr, len, r, w, x); | |
44 | if(err < 0){ | |
45 | if(must_succeed) | |
46 | panic("protect failed, err = %d", -err); | |
47 | else return(err); | |
48 | } | |
49 | return(0); | |
50 | } | |
51 | ||
ea2ba7dc GS |
52 | void kill_child_dead(int pid) |
53 | { | |
54 | kill(pid, SIGKILL); | |
55 | kill(pid, SIGCONT); | |
56 | do { | |
57 | int n; | |
58 | CATCH_EINTR(n = waitpid(pid, NULL, 0)); | |
59 | if (n > 0) | |
60 | kill(pid, SIGCONT); | |
61 | else | |
62 | break; | |
63 | } while(1); | |
64 | } | |
65 | ||
60d339f6 GS |
66 | /* |
67 | *------------------------- | |
68 | * only for tt mode (will be deleted in future...) | |
69 | *------------------------- | |
70 | */ | |
71 | ||
72 | struct tramp { | |
73 | int (*tramp)(void *); | |
74 | void *tramp_data; | |
75 | unsigned long temp_stack; | |
76 | int flags; | |
77 | int pid; | |
78 | }; | |
79 | ||
80 | /* See above for why sigkill is here */ | |
81 | ||
82 | int sigkill = SIGKILL; | |
83 | ||
84 | int outer_tramp(void *arg) | |
85 | { | |
86 | struct tramp *t; | |
87 | int sig = sigkill; | |
88 | ||
89 | t = arg; | |
90 | t->pid = clone(t->tramp, (void *) t->temp_stack + page_size()/2, | |
91 | t->flags, t->tramp_data); | |
92 | if(t->pid > 0) wait_for_stop(t->pid, SIGSTOP, PTRACE_CONT, NULL); | |
93 | kill(os_getpid(), sig); | |
94 | _exit(0); | |
95 | } | |
96 | ||
97 | int start_fork_tramp(void *thread_arg, unsigned long temp_stack, | |
98 | int clone_flags, int (*tramp)(void *)) | |
99 | { | |
100 | struct tramp arg; | |
101 | unsigned long sp; | |
102 | int new_pid, status, err; | |
103 | ||
104 | /* The trampoline will run on the temporary stack */ | |
105 | sp = stack_sp(temp_stack); | |
106 | ||
107 | clone_flags |= CLONE_FILES | SIGCHLD; | |
108 | ||
109 | arg.tramp = tramp; | |
110 | arg.tramp_data = thread_arg; | |
111 | arg.temp_stack = temp_stack; | |
112 | arg.flags = clone_flags; | |
113 | ||
114 | /* Start the process and wait for it to kill itself */ | |
115 | new_pid = clone(outer_tramp, (void *) sp, clone_flags, &arg); | |
116 | if(new_pid < 0) | |
117 | return(new_pid); | |
118 | ||
119 | CATCH_EINTR(err = waitpid(new_pid, &status, 0)); | |
120 | if(err < 0) | |
121 | panic("Waiting for outer trampoline failed - errno = %d", | |
122 | errno); | |
123 | ||
124 | if(!WIFSIGNALED(status) || (WTERMSIG(status) != SIGKILL)) | |
125 | panic("outer trampoline didn't exit with SIGKILL, " | |
126 | "status = %d", status); | |
127 | ||
128 | return(arg.pid); | |
129 | } | |
130 | ||
131 | void forward_pending_sigio(int target) | |
132 | { | |
133 | sigset_t sigs; | |
134 | ||
135 | if(sigpending(&sigs)) | |
136 | panic("forward_pending_sigio : sigpending failed"); | |
137 | if(sigismember(&sigs, SIGIO)) | |
138 | kill(target, SIGIO); | |
139 | } | |
140 |