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/ptrace.h> 40 #include <sys/reg.h> 41 #include <sys/sdt.h> 42 43 #include <security/audit/audit.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_fork.h> 50 #include <compat/linux/linux_misc.h> 51 #include <compat/linux/linux_mmap.h> 52 #include <compat/linux/linux_util.h> 53 54 #define LINUX_ARCH_AARCH64 0xc00000b7 55 56 /* DTrace init */ 57 LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE); 58 59 /* DTrace probes */ 60 LIN_SDT_PROBE_DEFINE0(machdep, linux_mmap2, todo); 61 62 /* 63 * LINUXTODO: deduplicate; linux_execve is common across archs, except that on 64 * amd64 compat linuxulator it calls freebsd32_exec_copyin_args. 65 */ 66 int 67 linux_execve(struct thread *td, struct linux_execve_args *uap) 68 { 69 struct image_args eargs; 70 char *path; 71 int error; 72 73 if (!LUSECONVPATH(td)) { 74 error = exec_copyin_args(&eargs, uap->path, UIO_USERSPACE, 75 uap->argp, uap->envp); 76 } else { 77 LCONVPATHEXIST(uap->path, &path); 78 error = exec_copyin_args(&eargs, path, UIO_SYSSPACE, 79 uap->argp, uap->envp); 80 LFREEPATH(path); 81 } 82 if (error == 0) 83 error = linux_common_execve(td, &eargs); 84 AUDIT_SYSCALL_EXIT(error == EJUSTRETURN ? 0 : error, td); 85 return (error); 86 } 87 88 int 89 linux_set_upcall(struct thread *td, register_t stack) 90 { 91 92 if (stack) 93 td->td_frame->tf_sp = stack; 94 95 /* 96 * The newly created Linux thread returns 97 * to the user space by the same path that a parent does. 98 */ 99 td->td_frame->tf_x[0] = 0; 100 return (0); 101 } 102 103 /* LINUXTODO: deduplicate arm64 linux_mmap2 */ 104 int 105 linux_mmap2(struct thread *td, struct linux_mmap2_args *uap) 106 { 107 108 LIN_SDT_PROBE0(machdep, linux_mmap2, todo); 109 return (linux_mmap_common(td, PTROUT(uap->addr), uap->len, uap->prot, 110 uap->flags, uap->fd, uap->pgoff)); 111 } 112 113 int 114 linux_mprotect(struct thread *td, struct linux_mprotect_args *uap) 115 { 116 117 return (linux_mprotect_common(td, PTROUT(uap->addr), uap->len, 118 uap->prot)); 119 } 120 121 int 122 linux_madvise(struct thread *td, struct linux_madvise_args *uap) 123 { 124 125 return (linux_madvise_common(td, PTROUT(uap->addr), uap->len, uap->behav)); 126 } 127 128 int 129 linux_set_cloned_tls(struct thread *td, void *desc) 130 { 131 132 if ((uint64_t)desc >= VM_MAXUSER_ADDRESS) 133 return (EPERM); 134 135 return (cpu_set_user_tls(td, desc)); 136 } 137 138 void 139 bsd_to_linux_regset(const struct reg *b_reg, struct linux_pt_regset *l_regset) 140 { 141 142 KASSERT(sizeof(l_regset->x) == sizeof(b_reg->x) + sizeof(l_ulong), 143 ("%s: size mismatch\n", __func__)); 144 memcpy(l_regset->x, b_reg->x, sizeof(b_reg->x)); 145 146 l_regset->x[30] = b_reg->lr; 147 l_regset->sp = b_reg->sp; 148 l_regset->pc = b_reg->elr; 149 l_regset->cpsr = b_reg->spsr; 150 } 151 152 void 153 linux_to_bsd_regset(struct reg *b_reg, const struct linux_pt_regset *l_regset) 154 { 155 156 KASSERT(sizeof(l_regset->x) == sizeof(b_reg->x) + sizeof(l_ulong), 157 ("%s: size mismatch\n", __func__)); 158 159 memcpy(b_reg->x, l_regset->x, sizeof(b_reg->x)); 160 b_reg->sp = l_regset->sp; 161 b_reg->elr = l_regset->pc; 162 b_reg->spsr = l_regset->cpsr; 163 } 164 165 void 166 linux_ptrace_get_syscall_info_machdep(const struct reg *reg, 167 struct syscall_info *si) 168 { 169 170 si->arch = LINUX_ARCH_AARCH64; 171 si->instruction_pointer = reg->lr; 172 si->stack_pointer = reg->sp; 173 } 174 175 int 176 linux_ptrace_getregs_machdep(struct thread *td __unused, pid_t pid __unused, 177 struct linux_pt_regset *l_regset __unused) 178 { 179 180 return (0); 181 } 182 183