2 * SPDX-License-Identifier: BSD-4-Clause
4 * Copyright 1997 Sean Eric Fagan
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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
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
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
37 /* FreeBSD/amd64-specific system call handling. */
39 #include <sys/ptrace.h>
40 #include <sys/syscall.h>
42 #include <machine/reg.h>
43 #include <machine/psl.h>
47 #include <sysdecode.h>
52 amd64_fetch_args(struct trussinfo *trussinfo, u_int narg)
54 struct ptrace_io_desc iorequest;
56 struct current_syscall *cs;
60 tid = trussinfo->curthread->tid;
61 cs = &trussinfo->curthread->cs;
62 if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) {
63 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
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.
72 * The system call argument count and code from ptrace() already
73 * account for these, but we need to skip over %rax if it contains
74 * either of these values.
84 for (i = 0; i < narg && reg < 6; i++, reg++) {
86 case 0: cs->args[i] = regs.r_rdi; break;
87 case 1: cs->args[i] = regs.r_rsi; break;
88 case 2: cs->args[i] = regs.r_rdx; break;
89 case 3: cs->args[i] = regs.r_rcx; break;
90 case 4: cs->args[i] = regs.r_r8; break;
91 case 5: cs->args[i] = regs.r_r9; break;
95 iorequest.piod_op = PIOD_READ_D;
96 iorequest.piod_offs = (void *)(regs.r_rsp + sizeof(register_t));
97 iorequest.piod_addr = &cs->args[i];
98 iorequest.piod_len = (narg - i) * sizeof(register_t);
99 ptrace(PT_IO, tid, (caddr_t)&iorequest, 0);
100 if (iorequest.piod_len == 0)
108 amd64_fetch_retval(struct trussinfo *trussinfo, long *retval, int *errorp)
113 tid = trussinfo->curthread->tid;
114 if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) {
115 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
119 retval[0] = regs.r_rax;
120 retval[1] = regs.r_rdx;
121 *errorp = !!(regs.r_rflags & PSL_C);
125 static struct procabi amd64_freebsd = {
127 SYSDECODE_ABI_FREEBSD,
130 STAILQ_HEAD_INITIALIZER(amd64_freebsd.extra_syscalls),
134 PROCABI(amd64_freebsd);