| Bodo Stroesser | 9786a8f | 2005-07-07 17:56:50 -0700 | [diff] [blame^] | 1 | #include <sched.h> |
| 2 | #include <signal.h> |
| 3 | #include <sys/mman.h> |
| 4 | #include <sys/time.h> |
| 5 | #include <asm/unistd.h> |
| 6 | #include <asm/page.h> |
| 7 | #include "ptrace_user.h" |
| 8 | #include "skas.h" |
| 9 | #include "stub-data.h" |
| 10 | #include "uml-config.h" |
| 11 | #include "sysdep/stub.h" |
| 12 | |
| 13 | /* This is in a separate file because it needs to be compiled with any |
| 14 | * extraneous gcc flags (-pg, -fprofile-arcs, -ftest-coverage) disabled |
| 15 | */ |
| 16 | void __attribute__ ((__section__ (".__syscall_stub"))) |
| 17 | stub_clone_handler(void) |
| 18 | { |
| 19 | long err; |
| 20 | struct stub_data *from = (struct stub_data *) UML_CONFIG_STUB_DATA; |
| 21 | |
| 22 | err = stub_syscall2(__NR_clone, CLONE_PARENT | CLONE_FILES | SIGCHLD, |
| 23 | UML_CONFIG_STUB_DATA + PAGE_SIZE / 2 - |
| 24 | sizeof(void *)); |
| 25 | if(err != 0) |
| 26 | goto out; |
| 27 | |
| 28 | err = stub_syscall4(__NR_ptrace, PTRACE_TRACEME, 0, 0, 0); |
| 29 | if(err) |
| 30 | goto out; |
| 31 | |
| 32 | err = stub_syscall3(__NR_setitimer, ITIMER_VIRTUAL, |
| 33 | (long) &from->timer, 0); |
| 34 | if(err) |
| 35 | goto out; |
| 36 | |
| 37 | err = stub_syscall6(STUB_MMAP_NR, UML_CONFIG_STUB_DATA, PAGE_SIZE, |
| 38 | PROT_READ | PROT_WRITE, MAP_FIXED | MAP_SHARED, |
| 39 | from->fd, from->offset); |
| 40 | out: |
| 41 | /* save current result. Parent: pid; child: retcode of mmap */ |
| 42 | from->err = err; |
| 43 | trap_myself(); |
| 44 | } |