amd64-linux.c revision 330897 
1/*-
2 * SPDX-License-Identifier: BSD-4-Clause
3 *
4 * Copyright 1997 Sean Eric Fagan
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
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
19 *    permission.
20 *
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
31 * SUCH DAMAGE.
32 */
33
34#include <sys/cdefs.h>
35__FBSDID("$FreeBSD: stable/11/usr.bin/truss/amd64-linux.c 330897 2018-03-14 03:19:51Z eadler $");
36
37/* Linux/x86_64-specific system call handling. */
38
39#include <sys/ptrace.h>
40
41#include <machine/reg.h>
42#include <machine/psl.h>
43
44#include <stdbool.h>
45#include <stdio.h>
46#include <sysdecode.h>
47
48#include "truss.h"
49
50static int
51amd64_linux_fetch_args(struct trussinfo *trussinfo, u_int narg)
52{
53	struct reg regs;
54	struct current_syscall *cs;
55	lwpid_t tid;
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	switch (narg) {
65	default:
66		cs->args[5] = regs.r_r9;
67	case 5:
68		cs->args[4] = regs.r_r8;
69	case 4:
70		cs->args[3] = regs.r_rcx;
71	case 3:
72		cs->args[2] = regs.r_rdx;
73	case 2:
74		cs->args[1] = regs.r_rsi;
75	case 1:
76		cs->args[0] = regs.r_rdi;
77	}
78
79	return (0);
80}
81
82static int
83amd64_linux_fetch_retval(struct trussinfo *trussinfo, long *retval, int *errorp)
84{
85	struct reg regs;
86	lwpid_t tid;
87
88	tid = trussinfo->curthread->tid;
89	if (ptrace(PT_GETREGS, tid, (caddr_t)&regs, 0) < 0) {
90		fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
91		return (-1);
92	}
93
94	retval[0] = regs.r_rax;
95	retval[1] = regs.r_rdx;
96	*errorp = !!(regs.r_rflags & PSL_C);
97	return (0);
98}
99
100static struct procabi amd64_linux = {
101	"Linux ELF64",
102	SYSDECODE_ABI_LINUX,
103	amd64_linux_fetch_args,
104	amd64_linux_fetch_retval,
105	STAILQ_HEAD_INITIALIZER(amd64_linux.extra_syscalls),
106	{ NULL }
107};
108
109PROCABI(amd64_linux);
110