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 294849 2016-01-26 19:07:09Z jhb $");
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#include <sysdecode.h>
45
46#include "truss.h"
47
48static int
49mips_fetch_args(struct trussinfo *trussinfo, u_int narg)
50{
51 struct ptrace_io_desc iorequest;
52 struct reg regs;
53 struct current_syscall *cs;
54 lwpid_t tid;
55 u_int i, reg;
56
57 tid = trussinfo->curthread->tid;
58 cs = &trussinfo->curthread->cs;
59 if (ptrace(PT_GETREGS, tid, (caddr_t)&regs, 0) < 0) {
60 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
61 return (-1);
62 }
63
64 /*
65 * FreeBSD has two special kinds of system call redirections --
66 * SYS_syscall, and SYS___syscall. The former is the old syscall()
67 * routine, basically; the latter is for quad-aligned arguments.
68 *
69 * The system call argument count and code from ptrace() already
70 * account for these, but we need to skip over the first argument.
71 */
72 reg = A0;
73 switch (regs.r_regs[V0]) {
74 case SYS_syscall:
75 reg = A1;
76 break;
77 case SYS___syscall:
78#if defined(__mips_n32) || defined(__mips_n64)
79 reg = A1;
80#else
81 reg = A2;
82#endif
83 break;
84 }
85
86#if defined(__mips_n32) || defined(__mips_n64)
87#define MAXREG A7
88#else
89#define MAXREG A3
90#endif
91
92 for (i = 0; i < narg && reg <= MAXREG; i++, reg++)
93 cs->args[i] = regs.r_regs[reg];
94 if (narg > i) {
95 iorequest.piod_op = PIOD_READ_D;
96 iorequest.piod_offs = (void *)((uintptr_t)regs.r_regs[SP] +
97 4 * sizeof(cs->args[0]));
98 iorequest.piod_addr = &cs->args[i];
99 iorequest.piod_len = (narg - i) * sizeof(cs->args[0]);
100 ptrace(PT_IO, tid, (caddr_t)&iorequest, 0);
101 if (iorequest.piod_len == 0)
102 return (-1);
103 }
104
105 return (0);
106}
107
108static int
109mips_fetch_retval(struct trussinfo *trussinfo, long *retval, int *errorp)
110{
111 struct reg regs;
112 lwpid_t tid;
113
114 tid = trussinfo->curthread->tid;
115 if (ptrace(PT_GETREGS, tid, (caddr_t)&regs, 0) < 0) {
116 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
117 return (-1);
118 }
119
120 /* XXX: Does not have special handling for __syscall(). */
121 retval[0] = regs.r_regs[V0];
122 retval[1] = regs.r_regs[V1];
123 *errorp = !!regs.r_regs[A3];
124 return (0);
125}
126
127
128static struct procabi mips_freebsd = {
129#ifdef __mips_n64
130 "FreeBSD ELF64",
131#else
132 "FreeBSD ELF32",
133#endif
134 FREEBSD,
135 mips_fetch_args,
136 mips_fetch_retval
137};
138
139PROCABI(mips_freebsd);