2 * SPDX-License-Identifier: BSD-4-Clause
4 * Copyright 1998 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/mips-specific system call handling. */
39 #define _WANT_MIPS_REGNUM
40 #include <sys/ptrace.h>
41 #include <sys/syscall.h>
43 #include <machine/frame.h>
44 #include <machine/reg.h>
48 #include <sysdecode.h>
53 mips_fetch_args(struct trussinfo *trussinfo, u_int narg)
55 struct ptrace_io_desc iorequest;
57 struct current_syscall *cs;
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 switch (regs.r_regs[V0]) {
82 #if defined(__mips_n32) || defined(__mips_n64)
90 #if defined(__mips_n32) || defined(__mips_n64)
96 for (i = 0; i < narg && reg <= MAXREG; i++, reg++)
97 cs->args[i] = regs.r_regs[reg];
99 iorequest.piod_op = PIOD_READ_D;
100 iorequest.piod_offs = (void *)((uintptr_t)regs.r_regs[SP] +
101 4 * sizeof(cs->args[0]));
102 iorequest.piod_addr = &cs->args[i];
103 iorequest.piod_len = (narg - i) * sizeof(cs->args[0]);
104 ptrace(PT_IO, tid, (caddr_t)&iorequest, 0);
105 if (iorequest.piod_len == 0)
113 mips_fetch_retval(struct trussinfo *trussinfo, long *retval, int *errorp)
118 tid = trussinfo->curthread->tid;
119 if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) {
120 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
124 /* XXX: Does not have special handling for __syscall(). */
125 retval[0] = regs.r_regs[V0];
126 retval[1] = regs.r_regs[V1];
127 *errorp = !!regs.r_regs[A3];
132 static struct procabi mips_freebsd = {
138 SYSDECODE_ABI_FREEBSD,
141 STAILQ_HEAD_INITIALIZER(mips_freebsd.extra_syscalls),
145 PROCABI(mips_freebsd);