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