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 <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>
20#include <asm/page.h>
21#include "kern_util.h"
22#include "user.h"
23#include "signal_kern.h"
24#include "sysdep/ptrace.h"
25#include "sysdep/sigcontext.h"
26#include "irq_user.h"
27#include "ptrace_user.h"
28#include "init.h"
29#include "os.h"
30#include "uml-config.h"
31#include "choose-mode.h"
32#include "mode.h"
33#include "tempfile.h"
34#include "kern_constants.h"
35
36int protect_memory(unsigned long addr, unsigned long len, int r, int w, int x,
37		   int must_succeed)
38{
39	int err;
40
41	err = os_protect_memory((void *) addr, len, r, w, x);
42	if(err < 0){
43                if(must_succeed)
44			panic("protect failed, err = %d", -err);
45		else return(err);
46	}
47	return(0);
48}
49
50void kill_child_dead(int pid)
51{
52	kill(pid, SIGKILL);
53	kill(pid, SIGCONT);
54	do {
55		int n;
56		CATCH_EINTR(n = waitpid(pid, NULL, 0));
57		if (n > 0)
58			kill(pid, SIGCONT);
59		else
60			break;
61	} while(1);
62}
63
64void stop(void)
65{
66	while(1) sleep(1000000);
67}
68
69int wait_for_stop(int pid, int sig, int cont_type, void *relay)
70{
71	sigset_t *relay_signals = relay;
72	int status, ret;
73
74	while(1){
75		CATCH_EINTR(ret = waitpid(pid, &status, WUNTRACED));
76		if((ret < 0) ||
77		   !WIFSTOPPED(status) || (WSTOPSIG(status) != sig)){
78			if(ret < 0){
79				printk("wait failed, errno = %d\n",
80				       errno);
81			}
82			else if(WIFEXITED(status))
83				printk("process %d exited with status %d\n",
84				       pid, WEXITSTATUS(status));
85			else if(WIFSIGNALED(status))
86				printk("process %d exited with signal %d\n",
87				       pid, WTERMSIG(status));
88			else if((WSTOPSIG(status) == SIGVTALRM) ||
89				(WSTOPSIG(status) == SIGALRM) ||
90				(WSTOPSIG(status) == SIGIO) ||
91				(WSTOPSIG(status) == SIGPROF) ||
92				(WSTOPSIG(status) == SIGCHLD) ||
93				(WSTOPSIG(status) == SIGWINCH) ||
94				(WSTOPSIG(status) == SIGINT)){
95				ptrace(cont_type, pid, 0, WSTOPSIG(status));
96				continue;
97			}
98			else if((relay_signals != NULL) &&
99				sigismember(relay_signals, WSTOPSIG(status))){
100				ptrace(cont_type, pid, 0, WSTOPSIG(status));
101				continue;
102			}
103			else printk("process %d stopped with signal %d\n",
104				    pid, WSTOPSIG(status));
105			panic("wait_for_stop failed to wait for %d to stop "
106			      "with %d\n", pid, sig);
107		}
108		return(status);
109	}
110}
111
112void forward_ipi(int fd, int pid)
113{
114	int err;
115
116	err = os_set_owner(fd, pid);
117	if(err < 0)
118		printk("forward_ipi: set_owner failed, fd = %d, me = %d, "
119		       "target = %d, err = %d\n", fd, os_getpid(), pid, -err);
120}
121
122/*
123 *-------------------------
124 * only for tt mode (will be deleted in future...)
125 *-------------------------
126 */
127
128struct tramp {
129	int (*tramp)(void *);
130	void *tramp_data;
131	unsigned long temp_stack;
132	int flags;
133	int pid;
134};
135
136/* See above for why sigkill is here */
137
138int sigkill = SIGKILL;
139
140int outer_tramp(void *arg)
141{
142	struct tramp *t;
143	int sig = sigkill;
144
145	t = arg;
146	t->pid = clone(t->tramp, (void *) t->temp_stack + UM_KERN_PAGE_SIZE/2,
147		       t->flags, t->tramp_data);
148	if(t->pid > 0) wait_for_stop(t->pid, SIGSTOP, PTRACE_CONT, NULL);
149	kill(os_getpid(), sig);
150	_exit(0);
151}
152
153int start_fork_tramp(void *thread_arg, unsigned long temp_stack,
154		     int clone_flags, int (*tramp)(void *))
155{
156	struct tramp arg;
157	unsigned long sp;
158	int new_pid, status, err;
159
160	/* The trampoline will run on the temporary stack */
161	sp = stack_sp(temp_stack);
162
163	clone_flags |= CLONE_FILES | SIGCHLD;
164
165	arg.tramp = tramp;
166	arg.tramp_data = thread_arg;
167	arg.temp_stack = temp_stack;
168	arg.flags = clone_flags;
169
170	/* Start the process and wait for it to kill itself */
171	new_pid = clone(outer_tramp, (void *) sp, clone_flags, &arg);
172	if(new_pid < 0)
173		return(new_pid);
174
175	CATCH_EINTR(err = waitpid(new_pid, &status, 0));
176	if(err < 0)
177		panic("Waiting for outer trampoline failed - errno = %d",
178		      errno);
179
180	if(!WIFSIGNALED(status) || (WTERMSIG(status) != SIGKILL))
181		panic("outer trampoline didn't exit with SIGKILL, "
182		      "status = %d", status);
183
184	return(arg.pid);
185}
186
187void forward_pending_sigio(int target)
188{
189	sigset_t sigs;
190
191	if(sigpending(&sigs))
192		panic("forward_pending_sigio : sigpending failed");
193	if(sigismember(&sigs, SIGIO))
194		kill(target, SIGIO);
195}
196