Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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 "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
37int 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
51void 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
65void stop(void)
66{
67 while(1) sleep(1000000);
68}
69
70int 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
113void forward_ipi(int fd, int pid)
114{
115 int err;
116
117 err = os_set_owner(fd, pid);
118 if(err < 0)
119 printk("forward_ipi: set_owner failed, fd = %d, me = %d, "
120 "target = %d, err = %d\n", fd, os_getpid(), pid, -err);
121}
122
123/*
124 *-------------------------
125 * only for tt mode (will be deleted in future...)
126 *-------------------------
127 */
128
129struct tramp {
130 int (*tramp)(void *);
131 void *tramp_data;
132 unsigned long temp_stack;
133 int flags;
134 int pid;
135};
136
137/* See above for why sigkill is here */
138
139int sigkill = SIGKILL;
140
141int outer_tramp(void *arg)
142{
143 struct tramp *t;
144 int sig = sigkill;
145
146 t = arg;
147 t->pid = clone(t->tramp, (void *) t->temp_stack + page_size()/2,
148 t->flags, t->tramp_data);
149 if(t->pid > 0) wait_for_stop(t->pid, SIGSTOP, PTRACE_CONT, NULL);
150 kill(os_getpid(), sig);
151 _exit(0);
152}
153
154int start_fork_tramp(void *thread_arg, unsigned long temp_stack,
155 int clone_flags, int (*tramp)(void *))
156{
157 struct tramp arg;
158 unsigned long sp;
159 int new_pid, status, err;
160
161 /* The trampoline will run on the temporary stack */
162 sp = stack_sp(temp_stack);
163
164 clone_flags |= CLONE_FILES | SIGCHLD;
165
166 arg.tramp = tramp;
167 arg.tramp_data = thread_arg;
168 arg.temp_stack = temp_stack;
169 arg.flags = clone_flags;
170
171 /* Start the process and wait for it to kill itself */
172 new_pid = clone(outer_tramp, (void *) sp, clone_flags, &arg);
173 if(new_pid < 0)
174 return(new_pid);
175
176 CATCH_EINTR(err = waitpid(new_pid, &status, 0));
177 if(err < 0)
178 panic("Waiting for outer trampoline failed - errno = %d",
179 errno);
180
181 if(!WIFSIGNALED(status) || (WTERMSIG(status) != SIGKILL))
182 panic("outer trampoline didn't exit with SIGKILL, "
183 "status = %d", status);
184
185 return(arg.pid);
186}
187
188void forward_pending_sigio(int target)
189{
190 sigset_t sigs;
191
192 if(sigpending(&sigs))
193 panic("forward_pending_sigio : sigpending failed");
194 if(sigismember(&sigs, SIGIO))
195 kill(target, SIGIO);
196}
197