sparc64-fbsd.c revision 290052 
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: stable/10/usr.bin/truss/sparc64-fbsd.c 290052 2015-10-27 17:00:04Z jhb $");
34
35/* FreeBSD/sparc64-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#include <machine/tstate.h>
43
44#include <stddef.h>
45#include <stdio.h>
46
47#include "truss.h"
48
49#include "syscalls.h"
50
51static int
52sparc64_fetch_args(struct trussinfo *trussinfo, u_int narg)
53{
54	struct ptrace_io_desc iorequest;
55	struct reg regs;
56	struct current_syscall *cs;
57	lwpid_t tid;
58	u_int i, reg;
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
67	/*
68	 * FreeBSD has two special kinds of system call redirections --
69	 * SYS_syscall, and SYS___syscall.  The former is the old syscall()
70	 * routine, basically; the latter is for quad-aligned arguments.
71	 *
72	 * The system call argument count and code from ptrace() already
73	 * account for these, but we need to skip over the first argument.
74	 */
75	reg = 0;
76	switch (regs.r_global[1]) {
77	case SYS_syscall:
78	case SYS___syscall:
79		reg = 1;
80		break;
81	}
82
83	for (i = 0; i < narg && reg < 6; i++, reg++)
84		cs->args[i] = regs.r_out[reg];
85	if (narg > i) {
86		iorequest.piod_op = PIOD_READ_D;
87		iorequest.piod_offs = (void *)(regs.r_out[6] + SPOFF +
88		    offsetof(struct frame, fr_pad[6]));
89		iorequest.piod_addr = &cs->args[i];
90		iorequest.piod_len = (narg - i) * sizeof(cs->args[0]);
91		ptrace(PT_IO, tid, (caddr_t)&iorequest, 0);
92		if (iorequest.piod_len == 0)
93			return (-1);
94	}
95
96	return (0);
97}
98
99static int
100sparc64_fetch_retval(struct trussinfo *trussinfo, long *retval, int *errorp)
101{
102	struct reg regs;
103	lwpid_t tid;
104
105	tid = trussinfo->curthread->tid;
106	if (ptrace(PT_GETREGS, tid, (caddr_t)&regs, 0) < 0) {
107		fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
108		return (-1);
109	}
110
111	retval[0] = regs.r_out[0];
112	retval[1] = regs.r_out[1];
113	*errorp = !!(regs.r_tstate & TSTATE_XCC_C);
114	return (0);
115}
116
117static struct procabi sparc64_fbsd = {
118	"FreeBSD ELF64",
119	syscallnames,
120	nitems(syscallnames),
121	sparc64_fetch_args,
122	sparc64_fetch_retval
123};
124
125PROCABI(sparc64_fbsd);
126