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/*-
* SPDX-License-Identifier: BSD-4-Clause
*
* Copyright 1997 Sean Eric Fagan
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Sean Eric Fagan
* 4. Neither the name of the author may be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/* Linux/i386-specific system call handling. */
#include <sys/ptrace.h>
#include <machine/reg.h>
#include <machine/psl.h>
#include <stdbool.h>
#include <stdio.h>
#include <sysdecode.h>
#include "truss.h"
static int
amd64_linux32_fetch_args(struct trussinfo *trussinfo, u_int narg)
{
struct reg regs;
struct current_syscall *cs;
lwpid_t tid;
tid = trussinfo->curthread->tid;
cs = &trussinfo->curthread->cs;
if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) {
fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
return (-1);
}
/*
* Linux passes syscall arguments in registers, not
* on the stack. Fortunately, we've got access to the
* register set. Note that we don't bother checking the
* number of arguments. And what does linux do for syscalls
* that have more than five arguments?
*/
switch (narg) {
default:
cs->args[5] = regs.r_rbp; /* Unconfirmed */
case 5:
cs->args[4] = regs.r_rdi;
case 4:
cs->args[3] = regs.r_rsi;
case 3:
cs->args[2] = regs.r_rdx;
case 2:
cs->args[1] = regs.r_rcx;
case 1:
cs->args[0] = regs.r_rbx;
}
return (0);
}
static int
amd64_linux32_fetch_retval(struct trussinfo *trussinfo, long *retval,
int *errorp)
{
struct reg regs;
lwpid_t tid;
tid = trussinfo->curthread->tid;
if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) {
fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
return (-1);
}
retval[0] = regs.r_rax & 0xffffffff;
retval[1] = regs.r_rdx & 0xffffffff;
*errorp = !!(regs.r_rflags & PSL_C);
if (*errorp)
retval[0] = (int)retval[0];
return (0);
}
static struct procabi amd64_linux32 = {
"Linux ELF32",
SYSDECODE_ABI_LINUX32,
amd64_linux32_fetch_args,
amd64_linux32_fetch_retval,
STAILQ_HEAD_INITIALIZER(amd64_linux32.extra_syscalls),
{ NULL }
};
PROCABI(amd64_linux32);
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