| /* |
| * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
| * Licensed under the GPL |
| */ |
| |
| #include <signal.h> |
| #include <sched.h> |
| #include <asm/unistd.h> |
| #include <sys/time.h> |
| #include "as-layout.h" |
| #include "ptrace_user.h" |
| #include "stub-data.h" |
| #include "sysdep/stub.h" |
| |
| /* |
| * This is in a separate file because it needs to be compiled with any |
| * extraneous gcc flags (-pg, -fprofile-arcs, -ftest-coverage) disabled |
| * |
| * Use UM_KERN_PAGE_SIZE instead of PAGE_SIZE because that calls getpagesize |
| * on some systems. |
| */ |
| |
| void __attribute__ ((__section__ (".__syscall_stub"))) |
| stub_clone_handler(void) |
| { |
| struct stub_data *data = (struct stub_data *) STUB_DATA; |
| long err; |
| |
| err = stub_syscall2(__NR_clone, CLONE_PARENT | CLONE_FILES | SIGCHLD, |
| STUB_DATA + UM_KERN_PAGE_SIZE / 2 - sizeof(void *)); |
| if (err != 0) |
| goto out; |
| |
| err = stub_syscall4(__NR_ptrace, PTRACE_TRACEME, 0, 0, 0); |
| if (err) |
| goto out; |
| |
| err = stub_syscall3(__NR_setitimer, ITIMER_VIRTUAL, |
| (long) &data->timer, 0); |
| if (err) |
| goto out; |
| |
| remap_stack(data->fd, data->offset); |
| goto done; |
| |
| out: |
| /* |
| * save current result. |
| * Parent: pid; |
| * child: retcode of mmap already saved and it jumps around this |
| * assignment |
| */ |
| data->err = err; |
| done: |
| trap_myself(); |
| } |