2 * Copyright 1997 Sean Eric Fagan
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
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
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
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
35 /* FreeBSD/amd64-specific system call handling. */
37 #include <sys/ptrace.h>
38 #include <sys/syscall.h>
40 #include <machine/reg.h>
41 #include <machine/psl.h>
44 #include <sysdecode.h>
49 amd64_fetch_args(struct trussinfo *trussinfo, u_int narg)
51 struct ptrace_io_desc iorequest;
53 struct current_syscall *cs;
57 tid = trussinfo->curthread->tid;
58 cs = &trussinfo->curthread->cs;
59 if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) {
60 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
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.
69 * The system call argument count and code from ptrace() already
70 * account for these, but we need to skip over %rax if it contains
71 * either of these values.
81 for (i = 0; i < narg && reg < 6; i++, reg++) {
83 case 0: cs->args[i] = regs.r_rdi; break;
84 case 1: cs->args[i] = regs.r_rsi; break;
85 case 2: cs->args[i] = regs.r_rdx; break;
86 case 3: cs->args[i] = regs.r_rcx; break;
87 case 4: cs->args[i] = regs.r_r8; break;
88 case 5: cs->args[i] = regs.r_r9; break;
92 iorequest.piod_op = PIOD_READ_D;
93 iorequest.piod_offs = (void *)(regs.r_rsp + sizeof(register_t));
94 iorequest.piod_addr = &cs->args[i];
95 iorequest.piod_len = (narg - i) * sizeof(register_t);
96 ptrace(PT_IO, tid, (caddr_t)&iorequest, 0);
97 if (iorequest.piod_len == 0)
105 amd64_fetch_retval(struct trussinfo *trussinfo, long *retval, int *errorp)
110 tid = trussinfo->curthread->tid;
111 if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) {
112 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
116 retval[0] = regs.r_rax;
117 retval[1] = regs.r_rdx;
118 *errorp = !!(regs.r_rflags & PSL_C);
122 static struct procabi amd64_freebsd = {
129 PROCABI(amd64_freebsd);