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127 lines
2.7 KiB
127 lines
2.7 KiB
/*
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* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
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* Licensed under the GPL
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <signal.h>
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#include <sched.h>
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#include <errno.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <setjmp.h>
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#include <sys/time.h>
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#include <sys/ptrace.h>
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#include <linux/ptrace.h>
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#include <sys/wait.h>
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#include <sys/mman.h>
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#include <asm/ptrace.h>
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#include <asm/unistd.h>
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#include <asm/page.h>
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#include "user_util.h"
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#include "kern_util.h"
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#include "user.h"
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#include "signal_kern.h"
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#include "signal_user.h"
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#include "sysdep/ptrace.h"
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#include "sysdep/sigcontext.h"
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#include "irq_user.h"
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#include "ptrace_user.h"
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#include "time_user.h"
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#include "init.h"
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#include "os.h"
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#include "uml-config.h"
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#include "choose-mode.h"
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#include "mode.h"
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#include "tempfile.h"
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int protect_memory(unsigned long addr, unsigned long len, int r, int w, int x,
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int must_succeed)
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{
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int err;
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err = os_protect_memory((void *) addr, len, r, w, x);
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if(err < 0){
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if(must_succeed)
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panic("protect failed, err = %d", -err);
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else return(err);
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}
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return(0);
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}
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/*
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*-------------------------
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* only for tt mode (will be deleted in future...)
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*-------------------------
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*/
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struct tramp {
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int (*tramp)(void *);
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void *tramp_data;
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unsigned long temp_stack;
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int flags;
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int pid;
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};
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/* See above for why sigkill is here */
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int sigkill = SIGKILL;
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int outer_tramp(void *arg)
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{
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struct tramp *t;
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int sig = sigkill;
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t = arg;
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t->pid = clone(t->tramp, (void *) t->temp_stack + page_size()/2,
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t->flags, t->tramp_data);
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if(t->pid > 0) wait_for_stop(t->pid, SIGSTOP, PTRACE_CONT, NULL);
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kill(os_getpid(), sig);
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_exit(0);
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}
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int start_fork_tramp(void *thread_arg, unsigned long temp_stack,
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int clone_flags, int (*tramp)(void *))
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{
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struct tramp arg;
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unsigned long sp;
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int new_pid, status, err;
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/* The trampoline will run on the temporary stack */
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sp = stack_sp(temp_stack);
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clone_flags |= CLONE_FILES | SIGCHLD;
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arg.tramp = tramp;
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arg.tramp_data = thread_arg;
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arg.temp_stack = temp_stack;
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arg.flags = clone_flags;
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/* Start the process and wait for it to kill itself */
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new_pid = clone(outer_tramp, (void *) sp, clone_flags, &arg);
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if(new_pid < 0)
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return(new_pid);
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CATCH_EINTR(err = waitpid(new_pid, &status, 0));
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if(err < 0)
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panic("Waiting for outer trampoline failed - errno = %d",
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errno);
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if(!WIFSIGNALED(status) || (WTERMSIG(status) != SIGKILL))
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panic("outer trampoline didn't exit with SIGKILL, "
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"status = %d", status);
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return(arg.pid);
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}
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void forward_pending_sigio(int target)
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{
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sigset_t sigs;
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if(sigpending(&sigs))
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panic("forward_pending_sigio : sigpending failed");
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if(sigismember(&sigs, SIGIO))
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kill(target, SIGIO);
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}
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