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/proc.h>
31#include <sys/ptrace.h>
32#include <sys/reg.h>
33
34#include <vm/vm_param.h>
35
36#include <arm64/linux/linux.h>
37#include <arm64/linux/linux_proto.h>
38#include <compat/linux/linux_fork.h>
39#include <compat/linux/linux_misc.h>
40#include <compat/linux/linux_util.h>
41
42#define	LINUX_ARCH_AARCH64		0xc00000b7
43
44
45int
46linux_set_upcall(struct thread *td, register_t stack)
47{
48
49	if (stack)
50		td->td_frame->tf_sp = stack;
51
52	/*
53	 * The newly created Linux thread returns
54	 * to the user space by the same path that a parent does.
55	 */
56	td->td_frame->tf_x[0] = 0;
57	return (0);
58}
59
60int
61linux_set_cloned_tls(struct thread *td, void *desc)
62{
63
64	if ((uint64_t)desc >= VM_MAXUSER_ADDRESS)
65		return (EPERM);
66
67	return (cpu_set_user_tls(td, desc));
68}
69
70void
71bsd_to_linux_regset(const struct reg *b_reg, struct linux_pt_regset *l_regset)
72{
73
74	KASSERT(sizeof(l_regset->x) == sizeof(b_reg->x) + sizeof(l_ulong),
75	    ("%s: size mismatch\n", __func__));
76	memcpy(l_regset->x, b_reg->x, sizeof(b_reg->x));
77
78	l_regset->x[30] = b_reg->lr;
79	l_regset->sp = b_reg->sp;
80	l_regset->pc = b_reg->elr;
81	l_regset->cpsr = b_reg->spsr;
82}
83
84void
85linux_to_bsd_regset(struct reg *b_reg, const struct linux_pt_regset *l_regset)
86{
87
88	KASSERT(sizeof(l_regset->x) == sizeof(b_reg->x) + sizeof(l_ulong),
89	    ("%s: size mismatch\n", __func__));
90
91	memcpy(b_reg->x, l_regset->x, sizeof(b_reg->x));
92	b_reg->sp = l_regset->sp;
93	b_reg->elr = l_regset->pc;
94	b_reg->spsr = l_regset->cpsr;
95}
96
97void
98linux_ptrace_get_syscall_info_machdep(const struct reg *reg,
99    struct syscall_info *si)
100{
101
102	si->arch = LINUX_ARCH_AARCH64;
103	si->instruction_pointer = reg->lr;
104	si->stack_pointer = reg->sp;
105}
106
107int
108linux_ptrace_getregs_machdep(struct thread *td __unused, pid_t pid __unused,
109    struct linux_pt_regset *l_regset __unused)
110{
111
112	return (0);
113}
114
115int
116linux_ptrace_peekuser(struct thread *td, pid_t pid, void *addr, void *data)
117{
118
119	LINUX_RATELIMIT_MSG_OPT1("PTRACE_PEEKUSER offset %ld not implemented; "
120	    "returning EINVAL", (uintptr_t)addr);
121	return (EINVAL);
122}
123
124int
125linux_ptrace_pokeuser(struct thread *td, pid_t pid, void *addr, void *data)
126{
127
128	LINUX_RATELIMIT_MSG_OPT1("PTRACE_POKEUSER offset %ld "
129	    "not implemented; returning EINVAL", (uintptr_t)addr);
130	return (EINVAL);
131}
132