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/sdt.h> 40 41 #include <security/audit/audit.h> 42 43 #include <machine/reg.h> 44 45 #include <arm64/linux/linux.h> 46 #include <arm64/linux/linux_proto.h> 47 #include <compat/linux/linux_dtrace.h> 48 #include <compat/linux/linux_emul.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 LIN_SDT_PROBE_DEFINE0(machdep, linux_rt_sigsuspend, todo); 59 LIN_SDT_PROBE_DEFINE0(machdep, linux_sigaltstack, todo); 60 61 /* 62 * LINUXTODO: deduplicate; linux_execve is common across archs, except that on 63 * amd64 compat linuxulator it calls freebsd32_exec_copyin_args. 64 */ 65 int 66 linux_execve(struct thread *td, struct linux_execve_args *uap) 67 { 68 struct image_args eargs; 69 char *path; 70 int error; 71 72 if (!LUSECONVPATH(td)) { 73 error = exec_copyin_args(&eargs, uap->path, UIO_USERSPACE, 74 uap->argp, uap->envp); 75 } else { 76 LCONVPATHEXIST(td, uap->path, &path); 77 error = exec_copyin_args(&eargs, path, UIO_SYSSPACE, 78 uap->argp, uap->envp); 79 LFREEPATH(path); 80 } 81 if (error == 0) 82 error = linux_common_execve(td, &eargs); 83 AUDIT_SYSCALL_EXIT(error == EJUSTRETURN ? 0 : error, td); 84 return (error); 85 } 86 87 int 88 linux_set_upcall(struct thread *td, register_t stack) 89 { 90 91 if (stack) 92 td->td_frame->tf_sp = stack; 93 94 /* 95 * The newly created Linux thread returns 96 * to the user space by the same path that a parent does. 97 */ 98 td->td_frame->tf_x[0] = 0; 99 return (0); 100 } 101 102 /* LINUXTODO: deduplicate arm64 linux_mmap2 */ 103 int 104 linux_mmap2(struct thread *td, struct linux_mmap2_args *uap) 105 { 106 107 LIN_SDT_PROBE0(machdep, linux_mmap2, todo); 108 return (linux_mmap_common(td, PTROUT(uap->addr), uap->len, uap->prot, 109 uap->flags, uap->fd, uap->pgoff)); 110 } 111 112 int 113 linux_mprotect(struct thread *td, struct linux_mprotect_args *uap) 114 { 115 116 return (linux_mprotect_common(td, PTROUT(uap->addr), uap->len, 117 uap->prot)); 118 } 119 120 int 121 linux_madvise(struct thread *td, struct linux_madvise_args *uap) 122 { 123 124 return (linux_madvise_common(td, PTROUT(uap->addr), uap->len, uap->behav)); 125 } 126 127 /* LINUXTODO: implement arm64 linux_rt_sigsuspend */ 128 int 129 linux_rt_sigsuspend(struct thread *td, struct linux_rt_sigsuspend_args *uap) 130 { 131 132 LIN_SDT_PROBE0(machdep, linux_rt_sigsuspend, todo); 133 return (EDOOFUS); 134 } 135 136 /* LINUXTODO: implement arm64 linux_sigaltstack */ 137 int 138 linux_sigaltstack(struct thread *td, struct linux_sigaltstack_args *uap) 139 { 140 141 LIN_SDT_PROBE0(machdep, linux_sigaltstack, todo); 142 return (EDOOFUS); 143 } 144 145 int 146 linux_set_cloned_tls(struct thread *td, void *desc) 147 { 148 149 if ((uint64_t)desc >= VM_MAXUSER_ADDRESS) 150 return (EPERM); 151 152 return (cpu_set_user_tls(td, desc)); 153 } 154 155 void 156 bsd_to_linux_regset(struct reg *b_reg, struct linux_pt_regset *l_regset) 157 { 158 159 KASSERT(sizeof(l_regset->x) == sizeof(b_reg->x) + sizeof(l_ulong), 160 ("%s: size mismatch\n", __func__)); 161 memcpy(l_regset->x, b_reg->x, sizeof(b_reg->x)); 162 163 l_regset->x[30] = b_reg->lr; 164 l_regset->sp = b_reg->sp; 165 l_regset->pc = b_reg->elr; 166 l_regset->cpsr = b_reg->spsr; 167 } 168