1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2018 Turing Robotic Industries Inc. 5 * Copyright (c) 2000 Marcel Moolenaar 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <sys/param.h> 35 #include <sys/fcntl.h> 36 #include <sys/imgact.h> 37 #include <sys/ktr.h> 38 #include <sys/proc.h> 39 #include <sys/reg.h> 40 #include <sys/sdt.h> 41 42 #include <security/audit/audit.h> 43 44 #include <arm64/linux/linux.h> 45 #include <arm64/linux/linux_proto.h> 46 #include <compat/linux/linux_dtrace.h> 47 #include <compat/linux/linux_emul.h> 48 #include <compat/linux/linux_fork.h> 49 #include <compat/linux/linux_misc.h> 50 #include <compat/linux/linux_mmap.h> 51 #include <compat/linux/linux_util.h> 52 53 /* DTrace init */ 54 LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE); 55 56 /* DTrace probes */ 57 LIN_SDT_PROBE_DEFINE0(machdep, linux_mmap2, todo); 58 59 /* 60 * LINUXTODO: deduplicate; linux_execve is common across archs, except that on 61 * amd64 compat linuxulator it calls freebsd32_exec_copyin_args. 62 */ 63 int 64 linux_execve(struct thread *td, struct linux_execve_args *uap) 65 { 66 struct image_args eargs; 67 char *path; 68 int error; 69 70 if (!LUSECONVPATH(td)) { 71 error = exec_copyin_args(&eargs, uap->path, UIO_USERSPACE, 72 uap->argp, uap->envp); 73 } else { 74 LCONVPATHEXIST(td, uap->path, &path); 75 error = exec_copyin_args(&eargs, path, UIO_SYSSPACE, 76 uap->argp, uap->envp); 77 LFREEPATH(path); 78 } 79 if (error == 0) 80 error = linux_common_execve(td, &eargs); 81 AUDIT_SYSCALL_EXIT(error == EJUSTRETURN ? 0 : error, td); 82 return (error); 83 } 84 85 int 86 linux_set_upcall(struct thread *td, register_t stack) 87 { 88 89 if (stack) 90 td->td_frame->tf_sp = stack; 91 92 /* 93 * The newly created Linux thread returns 94 * to the user space by the same path that a parent does. 95 */ 96 td->td_frame->tf_x[0] = 0; 97 return (0); 98 } 99 100 /* LINUXTODO: deduplicate arm64 linux_mmap2 */ 101 int 102 linux_mmap2(struct thread *td, struct linux_mmap2_args *uap) 103 { 104 105 LIN_SDT_PROBE0(machdep, linux_mmap2, todo); 106 return (linux_mmap_common(td, PTROUT(uap->addr), uap->len, uap->prot, 107 uap->flags, uap->fd, uap->pgoff)); 108 } 109 110 int 111 linux_mprotect(struct thread *td, struct linux_mprotect_args *uap) 112 { 113 114 return (linux_mprotect_common(td, PTROUT(uap->addr), uap->len, 115 uap->prot)); 116 } 117 118 int 119 linux_madvise(struct thread *td, struct linux_madvise_args *uap) 120 { 121 122 return (linux_madvise_common(td, PTROUT(uap->addr), uap->len, uap->behav)); 123 } 124 125 int 126 linux_set_cloned_tls(struct thread *td, void *desc) 127 { 128 129 if ((uint64_t)desc >= VM_MAXUSER_ADDRESS) 130 return (EPERM); 131 132 return (cpu_set_user_tls(td, desc)); 133 } 134 135 void 136 bsd_to_linux_regset(const struct reg *b_reg, struct linux_pt_regset *l_regset) 137 { 138 139 KASSERT(sizeof(l_regset->x) == sizeof(b_reg->x) + sizeof(l_ulong), 140 ("%s: size mismatch\n", __func__)); 141 memcpy(l_regset->x, b_reg->x, sizeof(b_reg->x)); 142 143 l_regset->x[30] = b_reg->lr; 144 l_regset->sp = b_reg->sp; 145 l_regset->pc = b_reg->elr; 146 l_regset->cpsr = b_reg->spsr; 147 } 148 149 void 150 linux_to_bsd_regset(struct reg *b_reg, const struct linux_pt_regset *l_regset) 151 { 152 153 KASSERT(sizeof(l_regset->x) == sizeof(b_reg->x) + sizeof(l_ulong), 154 ("%s: size mismatch\n", __func__)); 155 156 memcpy(b_reg->x, l_regset->x, sizeof(b_reg->x)); 157 b_reg->sp = l_regset->sp; 158 b_reg->elr = l_regset->pc; 159 b_reg->spsr = l_regset->cpsr; 160 } 161