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 /* Linux/i386-specific system call handling. */
37 #include <sys/ptrace.h>
39 #include <machine/reg.h>
40 #include <machine/psl.h>
44 #include <sysdecode.h>
49 i386_linux_fetch_args(struct trussinfo *trussinfo, u_int narg)
52 struct current_syscall *cs;
55 tid = trussinfo->curthread->tid;
56 cs = &trussinfo->curthread->cs;
57 if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) {
58 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
63 * Linux passes syscall arguments in registers, not
64 * on the stack. Fortunately, we've got access to the
65 * register set. Note that we don't bother checking the
66 * number of arguments. And what does linux do for syscalls
67 * that have more than five arguments?
71 cs->args[5] = regs.r_ebp; /* Unconfirmed */
73 cs->args[4] = regs.r_edi;
75 cs->args[3] = regs.r_esi;
77 cs->args[2] = regs.r_edx;
79 cs->args[1] = regs.r_ecx;
81 cs->args[0] = regs.r_ebx;
88 i386_linux_fetch_retval(struct trussinfo *trussinfo, long *retval, int *errorp)
93 tid = trussinfo->curthread->tid;
94 if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) {
95 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
99 retval[0] = regs.r_eax;
100 retval[1] = regs.r_edx;
101 *errorp = !!(regs.r_eflags & PSL_C);
105 static struct procabi i386_linux = {
108 i386_linux_fetch_args,
109 i386_linux_fetch_retval