1/*
2 * Copyright 1998 Sean Eric Fagan
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. All advertising materials mentioning features or use of this software
13 * must display the following acknowledgement:
14 * This product includes software developed by Sean Eric Fagan
15 * 4. Neither the name of the author may be used to endorse or promote
16 * products derived from this software without specific prior written
17 * permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33__FBSDID("$FreeBSD: head/usr.bin/truss/mips-freebsd.c 289239 2015-10-13 18:23:51Z bdrewery $");
34
35/* FreeBSD/mips-specific system call handling. */
36
37#include <sys/ptrace.h>
38#include <sys/syscall.h>
39
40#include <machine/frame.h>
41#include <machine/reg.h>
42
43#include <stdio.h>
44
45#include "truss.h"
46
47#include "freebsd_syscalls.h"
48
49static int
50mips_fetch_args(struct trussinfo *trussinfo, u_int narg)
51{
52 struct ptrace_io_desc iorequest;
53 struct reg regs;
54 struct current_syscall *cs;
55 lwpid_t tid;
56 u_int i, reg;
57
58 tid = trussinfo->curthread->tid;
59 cs = &trussinfo->curthread->cs;
60 if (ptrace(PT_GETREGS, tid, (caddr_t)&regs, 0) < 0) {
61 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
62 return (-1);
63 }
64
65 /*
66 * FreeBSD has two special kinds of system call redirections --
67 * SYS_syscall, and SYS___syscall. The former is the old syscall()
68 * routine, basically; the latter is for quad-aligned arguments.
69 *
70 * The system call argument count and code from ptrace() already
71 * account for these, but we need to skip over the first argument.
72 */
73 reg = A0;
74 switch (regs.r_regs[V0]) {
75 case SYS_syscall:
76 reg = A1;
77 break;
78 case SYS___syscall:
79#if defined(__mips_n32) || defined(__mips_n64)
80 reg = A1;
81#else
82 reg = A2;
83#endif
84 break;
85 }
86
87#if defined(__mips_n32) || defined(__mips_n64)
88#define MAXREG A7
89#else
90#define MAXREG A3
91#endif
92
93 for (i = 0; i < narg && reg <= MAXREG; i++, reg++)
94 cs->args[i] = regs.r_regs[reg];
95 if (narg > i) {
96 iorequest.piod_op = PIOD_READ_D;
97 iorequest.piod_offs = (void *)((uintptr_t)regs.r_regs[SP] +
98 4 * sizeof(cs->args[0]));
99 iorequest.piod_addr = &cs->args[i];
100 iorequest.piod_len = (narg - i) * sizeof(cs->args[0]);
101 ptrace(PT_IO, tid, (caddr_t)&iorequest, 0);
102 if (iorequest.piod_len == 0)
103 return (-1);
104 }
105
106 return (0);
107}
108
109static int
110mips_fetch_retval(struct trussinfo *trussinfo, long *retval, int *errorp)
111{
112 struct reg regs;
113 lwpid_t tid;
114
115 tid = trussinfo->curthread->tid;
116 if (ptrace(PT_GETREGS, tid, (caddr_t)&regs, 0) < 0) {
117 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
118 return (-1);
119 }
120
121 /* XXX: Does not have special handling for __syscall(). */
122 retval[0] = regs.r_regs[V0];
123 retval[1] = regs.r_regs[V1];
124 *errorp = !!regs.r_regs[A3];
125 return (0);
126}
127
128
129static struct procabi mips_freebsd = {
130#ifdef __mips_n64
131 "FreeBSD ELF64",
132#else
133 "FreeBSD ELF32",
134#endif
135 syscallnames,
136 nitems(syscallnames),
137 mips_fetch_args,
138 mips_fetch_retval
139};
140
141PROCABI(mips_freebsd);