Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) #include <signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <asm/unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <sys/time.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <as-layout.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <ptrace_user.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <stub-data.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <sysdep/stub.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)  * This is in a separate file because it needs to be compiled with any
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)  * extraneous gcc flags (-pg, -fprofile-arcs, -ftest-coverage) disabled
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)  * Use UM_KERN_PAGE_SIZE instead of PAGE_SIZE because that calls getpagesize
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)  * on some systems.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) void __attribute__ ((__section__ (".__syscall_stub")))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) stub_clone_handler(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	struct stub_data *data = (struct stub_data *) STUB_DATA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	long err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	err = stub_syscall2(__NR_clone, CLONE_PARENT | CLONE_FILES | SIGCHLD,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 			    STUB_DATA + UM_KERN_PAGE_SIZE / 2 - sizeof(void *));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	if (err != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	err = stub_syscall4(__NR_ptrace, PTRACE_TRACEME, 0, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	remap_stack(data->fd, data->offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)  out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	 * save current result.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	 * Parent: pid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	 * child: retcode of mmap already saved and it jumps around this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	 * assignment
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	data->err = err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)  done:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	trap_myself();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) }