1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 29 #include <sys/param.h> 30 #include <sys/fcntl.h> 31 #include <sys/ktr.h> 32 #include <sys/proc.h> 33 #include <sys/ptrace.h> 34 #include <sys/reg.h> 35 #include <sys/sdt.h> 36 37 #include <vm/vm_param.h> 38 39 #include <arm64/linux/linux.h> 40 #include <arm64/linux/linux_proto.h> 41 #include <compat/linux/linux_dtrace.h> 42 #include <compat/linux/linux_fork.h> 43 #include <compat/linux/linux_misc.h> 44 #include <compat/linux/linux_mmap.h> 45 #include <compat/linux/linux_util.h> 46 47 #define LINUX_ARCH_AARCH64 0xc00000b7 48 49 /* DTrace init */ 50 LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE); 51 52 /* DTrace probes */ 53 LIN_SDT_PROBE_DEFINE0(machdep, linux_mmap2, todo); 54 55 int 56 linux_set_upcall(struct thread *td, register_t stack) 57 { 58 59 if (stack) 60 td->td_frame->tf_sp = stack; 61 62 /* 63 * The newly created Linux thread returns 64 * to the user space by the same path that a parent does. 65 */ 66 td->td_frame->tf_x[0] = 0; 67 return (0); 68 } 69 70 /* LINUXTODO: deduplicate arm64 linux_mmap2 */ 71 int 72 linux_mmap2(struct thread *td, struct linux_mmap2_args *uap) 73 { 74 75 LIN_SDT_PROBE0(machdep, linux_mmap2, todo); 76 return (linux_mmap_common(td, PTROUT(uap->addr), uap->len, uap->prot, 77 uap->flags, uap->fd, uap->pgoff)); 78 } 79 80 int 81 linux_mprotect(struct thread *td, struct linux_mprotect_args *uap) 82 { 83 84 return (linux_mprotect_common(td, PTROUT(uap->addr), uap->len, 85 uap->prot)); 86 } 87 88 int 89 linux_madvise(struct thread *td, struct linux_madvise_args *uap) 90 { 91 92 return (linux_madvise_common(td, PTROUT(uap->addr), uap->len, uap->behav)); 93 } 94 95 int 96 linux_set_cloned_tls(struct thread *td, void *desc) 97 { 98 99 if ((uint64_t)desc >= VM_MAXUSER_ADDRESS) 100 return (EPERM); 101 102 return (cpu_set_user_tls(td, desc)); 103 } 104 105 void 106 bsd_to_linux_regset(const struct reg *b_reg, struct linux_pt_regset *l_regset) 107 { 108 109 KASSERT(sizeof(l_regset->x) == sizeof(b_reg->x) + sizeof(l_ulong), 110 ("%s: size mismatch\n", __func__)); 111 memcpy(l_regset->x, b_reg->x, sizeof(b_reg->x)); 112 113 l_regset->x[30] = b_reg->lr; 114 l_regset->sp = b_reg->sp; 115 l_regset->pc = b_reg->elr; 116 l_regset->cpsr = b_reg->spsr; 117 } 118 119 void 120 linux_to_bsd_regset(struct reg *b_reg, const struct linux_pt_regset *l_regset) 121 { 122 123 KASSERT(sizeof(l_regset->x) == sizeof(b_reg->x) + sizeof(l_ulong), 124 ("%s: size mismatch\n", __func__)); 125 126 memcpy(b_reg->x, l_regset->x, sizeof(b_reg->x)); 127 b_reg->sp = l_regset->sp; 128 b_reg->elr = l_regset->pc; 129 b_reg->spsr = l_regset->cpsr; 130 } 131 132 void 133 linux_ptrace_get_syscall_info_machdep(const struct reg *reg, 134 struct syscall_info *si) 135 { 136 137 si->arch = LINUX_ARCH_AARCH64; 138 si->instruction_pointer = reg->lr; 139 si->stack_pointer = reg->sp; 140 } 141 142 int 143 linux_ptrace_getregs_machdep(struct thread *td __unused, pid_t pid __unused, 144 struct linux_pt_regset *l_regset __unused) 145 { 146 147 return (0); 148 } 149 150 int 151 linux_ptrace_peekuser(struct thread *td, pid_t pid, void *addr, void *data) 152 { 153 154 LINUX_RATELIMIT_MSG_OPT1("PTRACE_PEEKUSER offset %ld not implemented; " 155 "returning EINVAL", (uintptr_t)addr); 156 return (EINVAL); 157 } 158 159 int 160 linux_ptrace_pokeuser(struct thread *td, pid_t pid, void *addr, void *data) 161 { 162 163 LINUX_RATELIMIT_MSG_OPT1("PTRACE_POKEUSER offset %ld " 164 "not implemented; returning EINVAL", (uintptr_t)addr); 165 return (EINVAL); 166 } 167