os-Linux/skas/process.c

27 int is_skas_winch(int pid, int fd, void *data)
29 	return pid == getpgrp();
80 static int ptrace_dump_regs(int pid)
85 	if (ptrace(PTRACE_GETREGS, pid, 0, regs) < 0)
107 void wait_stub_done(int pid)
112 		CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED | __WALL));
119 		err = ptrace(PTRACE_CONT, pid, 0, 0);
131 	err = ptrace_dump_regs(pid);
135 	printk(UM_KERN_ERR "%s : failed to wait for SIGTRAP, pid = %d, n = %d, errno = %d, status = 0x%x\n",
136 	       __func__, pid, n, errno, status);
142 static void get_skas_faultinfo(int pid, struct faultinfo *fi, unsigned long *aux_fp_regs)
146 	err = get_fp_registers(pid, aux_fp_regs);
152 	err = ptrace(PTRACE_CONT, pid, 0, SIGSEGV);
154 		printk(UM_KERN_ERR "Failed to continue stub, pid = %d, "
155 		       "errno = %d\n", pid, errno);
158 	wait_stub_done(pid);
166 	err = put_fp_registers(pid, aux_fp_regs);
174 static void handle_segv(int pid, struct uml_pt_regs *regs, unsigned long *aux_fp_regs)
176 	get_skas_faultinfo(pid, &regs->faultinfo, aux_fp_regs);
180 static void handle_trap(int pid, struct uml_pt_regs *regs)
272 	int pid, status, n, flags, err;
291 	pid = clone(userspace_tramp, (void *) sp, flags, (void *) stub_stack);
292 	if (pid < 0) {
300 		CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED | __WALL));
316 	if (ptrace(PTRACE_SETOPTIONS, pid, NULL,
331 	return pid;
334 	os_kill_ptraced_process(pid, 1);
340 	int err, status, op, pid = userspace_pid[0];
358 		if (ptrace(PTRACE_SETREGS, pid, 0, regs->gp)) {
364 		if (put_fp_registers(pid, regs->fp)) {
375 		if (ptrace(op, pid, 0, 0)) {
381 		CATCH_EINTR(err = waitpid(pid, &status, WUNTRACED | __WALL));
389 		if (ptrace(PTRACE_GETREGS, pid, 0, regs->gp)) {
395 		if (get_fp_registers(pid, regs->fp)) {
417 				ptrace(PTRACE_GETSIGINFO, pid, 0, (struct siginfo *)&si);
424 					get_skas_faultinfo(pid,
429 				else handle_segv(pid, regs, aux_fp_regs);
432 				handle_trap(pid, regs);
453 			pid = userspace_pid[0];
483 int copy_context_skas0(unsigned long new_stack, int pid)
507 	err = ptrace_setregs(pid, thread_regs);
510 		printk(UM_KERN_ERR "%s : PTRACE_SETREGS failed, pid = %d, errno = %d\n",
511 		      __func__, pid, -err);
515 	err = put_fp_registers(pid, thread_fp_regs);
517 		printk(UM_KERN_ERR "%s : put_fp_registers failed, pid = %d, err = %d\n",
518 		       __func__, pid, err);
523 	 * Wait, until parent has finished its work: read child's pid from
526 	err = ptrace(PTRACE_CONT, pid, 0, 0);
529 		printk(UM_KERN_ERR "Failed to continue new process, pid = %d, errno = %d\n",
530 		       pid, errno);
534 	wait_stub_done(pid);
536 	pid = data->parent_err;
537 	if (pid < 0) {
539 		      __func__, -pid);
540 		return pid;
547 	wait_stub_done(pid);
550 		       __func__, pid, data->child_err);
555 	if (ptrace(PTRACE_SETOPTIONS, pid, NULL,
563 	return pid;
566 	os_kill_ptraced_process(pid, 1);
685 	userspace_pid[0] = mm_idp->u.pid;