2 * SPDX-License-Identifier: BSD-4-Clause
4 * Copyright 1997 Sean Eric Fagan
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 * must display the following acknowledgement:
16 * This product includes software developed by Sean Eric Fagan
17 * 4. Neither the name of the author may be used to endorse or promote
18 * products derived from this software without specific prior written
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
37 /* FreeBSD/arm-specific system call handling. */
39 #include <sys/ptrace.h>
40 #include <sys/syscall.h>
42 #include <machine/reg.h>
43 #include <machine/armreg.h>
44 #include <machine/ucontext.h>
48 #include <sysdecode.h>
53 arm_fetch_args(struct trussinfo *trussinfo, u_int narg)
55 struct ptrace_io_desc iorequest;
57 struct current_syscall *cs;
59 u_int i, reg, syscall_num;
61 tid = trussinfo->curthread->tid;
62 cs = &trussinfo->curthread->cs;
63 if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) {
64 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
69 * FreeBSD has two special kinds of system call redirections --
70 * SYS_syscall, and SYS___syscall. The former is the old syscall()
71 * routine, basically; the latter is for quad-aligned arguments.
73 * The system call argument count and code from ptrace() already
74 * account for these, but we need to skip over the first argument.
77 syscall_num = regs.r[7];
79 if ((syscall_num = ptrace(PT_READ_I, tid,
80 (caddr_t)(regs.r[_REG_PC] - INSN_SIZE), 0)) == -1) {
81 fprintf(trussinfo->outfile, "-- CANNOT READ PC --\n");
84 syscall_num = syscall_num & 0x000fffff;
88 switch (syscall_num) {
97 for (i = 0; i < narg && reg < 4; i++, reg++)
98 cs->args[i] = regs.r[reg];
100 iorequest.piod_op = PIOD_READ_D;
101 iorequest.piod_offs = (void *)(regs.r_sp +
102 4 * sizeof(uint32_t));
103 iorequest.piod_addr = &cs->args[i];
104 iorequest.piod_len = (narg - i) * sizeof(cs->args[0]);
105 ptrace(PT_IO, tid, (caddr_t)&iorequest, 0);
106 if (iorequest.piod_len == 0)
114 arm_fetch_retval(struct trussinfo *trussinfo, long *retval, int *errorp)
119 tid = trussinfo->curthread->tid;
120 if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) {
121 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
125 /* XXX: Does not have the __ARMEB__ handling for __syscall(). */
126 retval[0] = regs.r[0];
127 retval[1] = regs.r[1];
128 *errorp = !!(regs.r_cpsr & PSR_C);
132 static struct procabi arm_freebsd = {
134 SYSDECODE_ABI_FREEBSD,
137 STAILQ_HEAD_INITIALIZER(arm_freebsd.extra_syscalls),
141 PROCABI(arm_freebsd);