#include <sched.h> #include <signal.h> #include <sys/mman.h> #include <sys/time.h> #include <asm/unistd.h> #include <asm/page.h> #include "ptrace_user.h" #include "skas.h" #include "stub-data.h" #include "uml-config.h" #include "sysdep/stub.h" #include "kern_constants.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 *) UML_CONFIG_STUB_DATA; long err; err = stub_syscall2(__NR_clone, CLONE_PARENT | CLONE_FILES | SIGCHLD, UML_CONFIG_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(); }