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/*
* 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 <stdio.h>
#include "truss.h"
#include "linux_syscalls.h"
static int
i386_linux_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_ebp; /* Unconfirmed */
case 5:
cs->args[4] = regs.r_edi;
case 4:
cs->args[3] = regs.r_esi;
case 3:
cs->args[2] = regs.r_edx;
case 2:
cs->args[1] = regs.r_ecx;
case 1:
cs->args[0] = regs.r_ebx;
}
return (0);
}
/*
* Linux syscalls return negative errno's, we do positive and map them
*/
static const int bsd_to_linux_errno[] = {
-0, -1, -2, -3, -4, -5, -6, -7, -8, -9,
-10, -35, -12, -13, -14, -15, -16, -17, -18, -19,
-20, -21, -22, -23, -24, -25, -26, -27, -28, -29,
-30, -31, -32, -33, -34, -11,-115,-114, -88, -89,
-90, -91, -92, -93, -94, -95, -96, -97, -98, -99,
-100,-101,-102,-103,-104,-105,-106,-107,-108,-109,
-110,-111, -40, -36,-112,-113, -39, -11, -87,-122,
-116, -66, -6, -6, -6, -6, -6, -37, -38, -9,
-6,
};
static int
i386_linux_fetch_retval(struct trussinfo *trussinfo, long *retval, int *errorp)
{
struct reg regs;
lwpid_t tid;
size_t i;
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_eax;
retval[1] = regs.r_edx;
*errorp = !!(regs.r_eflags & PSL_C);
if (*errorp) {
for (i = 0; i < nitems(bsd_to_linux_errno); i++) {
if (retval[0] == bsd_to_linux_errno[i]) {
retval[0] = i;
return (0);
}
}
/* XXX: How to handle unknown errors? */
}
return (0);
}
static struct procabi i386_linux = {
"Linux ELF",
linux_syscallnames,
nitems(linux_syscallnames),
i386_linux_fetch_args,
i386_linux_fetch_retval
};
PROCABI(i386_linux);
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