1/*
2 * Copyright 1997 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: releng/11.0/usr.bin/truss/amd64-freebsd32.c 295056 2016-01-30 01:00:54Z jhb $");
34
35/* FreeBSD/amd64-freebsd32-specific system call handling. */
36
37#include <sys/ptrace.h>
38#include <sys/syscall.h>
39
40#include <machine/reg.h>
41#include <machine/psl.h>
42
43#include <stdio.h>
44#include <stdlib.h>
45#include <sysdecode.h>
46
47#include "truss.h"
48
49static int
50amd64_freebsd32_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	unsigned int args32[narg];
56	unsigned long parm_offset;
57	lwpid_t tid;
58	u_int i;
59
60	tid = trussinfo->curthread->tid;
61	cs = &trussinfo->curthread->cs;
62	if (ptrace(PT_GETREGS, tid, (caddr_t)&regs, 0) < 0) {
63		fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
64		return (-1);
65	}
66	parm_offset = regs.r_rsp + sizeof(int);
67
68	/*
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.
72	 *
73	 * The system call argument count and code from ptrace() already
74	 * account for these, but we need to skip over the first argument.
75	 */
76	switch (regs.r_rax) {
77	case SYS_syscall:
78		parm_offset += sizeof(int);
79		break;
80	case SYS___syscall:
81		parm_offset += sizeof(quad_t);
82		break;
83	}
84
85	iorequest.piod_op = PIOD_READ_D;
86	iorequest.piod_offs = (void *)parm_offset;
87	iorequest.piod_addr = args32;
88	iorequest.piod_len = sizeof(args32);
89	ptrace(PT_IO, tid, (caddr_t)&iorequest, 0);
90	if (iorequest.piod_len == 0) {
91		return (-1);
92	}
93
94	for (i = 0; i < narg; i++)
95		 cs->args[i] = args32[i];
96	return (0);
97}
98
99static int
100amd64_freebsd32_fetch_retval(struct trussinfo *trussinfo, long *retval,
101    int *errorp)
102{
103	struct reg regs;
104	lwpid_t tid;
105
106	tid = trussinfo->curthread->tid;
107	if (ptrace(PT_GETREGS, tid, (caddr_t)&regs, 0) < 0) {
108		fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
109		return (-1);
110	}
111
112	retval[0] = regs.r_rax & 0xffffffff;
113	retval[1] = regs.r_rdx & 0xffffffff;
114	*errorp = !!(regs.r_rflags & PSL_C);
115	return (0);
116}
117
118static struct procabi amd64_freebsd32 = {
119	"FreeBSD ELF32",
120	SYSDECODE_ABI_FREEBSD32,
121	amd64_freebsd32_fetch_args,
122	amd64_freebsd32_fetch_retval
123};
124
125PROCABI(amd64_freebsd32);
126
127static struct procabi amd64_freebsd32_aout = {
128	"FreeBSD a.out",
129	SYSDECODE_ABI_FREEBSD32,
130	amd64_freebsd32_fetch_args,
131	amd64_freebsd32_fetch_retval
132};
133
134PROCABI(amd64_freebsd32_aout);
135