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 /* Linux/i386-specific system call handling. */
39 #include <sys/ptrace.h>
41 #include <machine/reg.h>
42 #include <machine/psl.h>
46 #include <sysdecode.h>
51 i386_linux_fetch_args(struct trussinfo *trussinfo, u_int narg)
54 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 * Linux passes syscall arguments in registers, not
66 * on the stack. Fortunately, we've got access to the
67 * register set. Note that we don't bother checking the
68 * number of arguments. And what does linux do for syscalls
69 * that have more than five arguments?
73 cs->args[5] = regs.r_ebp; /* Unconfirmed */
75 cs->args[4] = regs.r_edi;
77 cs->args[3] = regs.r_esi;
79 cs->args[2] = regs.r_edx;
81 cs->args[1] = regs.r_ecx;
83 cs->args[0] = regs.r_ebx;
90 i386_linux_fetch_retval(struct trussinfo *trussinfo, long *retval, int *errorp)
95 tid = trussinfo->curthread->tid;
96 if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) {
97 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
101 retval[0] = regs.r_eax;
102 retval[1] = regs.r_edx;
103 *errorp = !!(regs.r_eflags & PSL_C);
107 static struct procabi i386_linux = {
110 i386_linux_fetch_args,
111 i386_linux_fetch_retval,
112 STAILQ_HEAD_INITIALIZER(i386_linux.extra_syscalls),