[PATCH] uml: move libc-dependent utility procedures
[linux-2.6.git] / arch / um / os-Linux / tt.c
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"
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
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
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
66 void stop(void)
67 {
68         while(1) sleep(1000000);
69 }
70
71 int wait_for_stop(int pid, int sig, int cont_type, void *relay)
72 {
73         sigset_t *relay_signals = relay;
74         int status, ret;
75
76         while(1){
77                 CATCH_EINTR(ret = waitpid(pid, &status, WUNTRACED));
78                 if((ret < 0) ||
79                    !WIFSTOPPED(status) || (WSTOPSIG(status) != sig)){
80                         if(ret < 0){
81                                 printk("wait failed, errno = %d\n",
82                                        errno);
83                         }
84                         else if(WIFEXITED(status))
85                                 printk("process %d exited with status %d\n",
86                                        pid, WEXITSTATUS(status));
87                         else if(WIFSIGNALED(status))
88                                 printk("process %d exited with signal %d\n",
89                                        pid, WTERMSIG(status));
90                         else if((WSTOPSIG(status) == SIGVTALRM) ||
91                                 (WSTOPSIG(status) == SIGALRM) ||
92                                 (WSTOPSIG(status) == SIGIO) ||
93                                 (WSTOPSIG(status) == SIGPROF) ||
94                                 (WSTOPSIG(status) == SIGCHLD) ||
95                                 (WSTOPSIG(status) == SIGWINCH) ||
96                                 (WSTOPSIG(status) == SIGINT)){
97                                 ptrace(cont_type, pid, 0, WSTOPSIG(status));
98                                 continue;
99                         }
100                         else if((relay_signals != NULL) &&
101                                 sigismember(relay_signals, WSTOPSIG(status))){
102                                 ptrace(cont_type, pid, 0, WSTOPSIG(status));
103                                 continue;
104                         }
105                         else printk("process %d stopped with signal %d\n",
106                                     pid, WSTOPSIG(status));
107                         panic("wait_for_stop failed to wait for %d to stop "
108                               "with %d\n", pid, sig);
109                 }
110                 return(status);
111         }
112 }
113
114 /*
115  *-------------------------
116  * only for tt mode (will be deleted in future...)
117  *-------------------------
118  */
119
120 struct tramp {
121         int (*tramp)(void *);
122         void *tramp_data;
123         unsigned long temp_stack;
124         int flags;
125         int pid;
126 };
127
128 /* See above for why sigkill is here */
129
130 int sigkill = SIGKILL;
131
132 int outer_tramp(void *arg)
133 {
134         struct tramp *t;
135         int sig = sigkill;
136
137         t = arg;
138         t->pid = clone(t->tramp, (void *) t->temp_stack + page_size()/2,
139                        t->flags, t->tramp_data);
140         if(t->pid > 0) wait_for_stop(t->pid, SIGSTOP, PTRACE_CONT, NULL);
141         kill(os_getpid(), sig);
142         _exit(0);
143 }
144
145 int start_fork_tramp(void *thread_arg, unsigned long temp_stack,
146                      int clone_flags, int (*tramp)(void *))
147 {
148         struct tramp arg;
149         unsigned long sp;
150         int new_pid, status, err;
151
152         /* The trampoline will run on the temporary stack */
153         sp = stack_sp(temp_stack);
154
155         clone_flags |= CLONE_FILES | SIGCHLD;
156
157         arg.tramp = tramp;
158         arg.tramp_data = thread_arg;
159         arg.temp_stack = temp_stack;
160         arg.flags = clone_flags;
161
162         /* Start the process and wait for it to kill itself */
163         new_pid = clone(outer_tramp, (void *) sp, clone_flags, &arg);
164         if(new_pid < 0)
165                 return(new_pid);
166
167         CATCH_EINTR(err = waitpid(new_pid, &status, 0));
168         if(err < 0)
169                 panic("Waiting for outer trampoline failed - errno = %d",
170                       errno);
171
172         if(!WIFSIGNALED(status) || (WTERMSIG(status) != SIGKILL))
173                 panic("outer trampoline didn't exit with SIGKILL, "
174                       "status = %d", status);
175
176         return(arg.pid);
177 }
178
179 void forward_pending_sigio(int target)
180 {
181         sigset_t sigs;
182
183         if(sigpending(&sigs))
184                 panic("forward_pending_sigio : sigpending failed");
185         if(sigismember(&sigs, SIGIO))
186                 kill(target, SIGIO);
187 }
188