freebsd-dev/usr.bin/truss/i386-freebsd.c
John Baldwin 5842bd683f Add a SYSDECODE_ABI_ prefix to the ABI enums to avoid potential collisions.
Suggested by:	jmallett
Reviewed by:	bdrewery, jmallett
Differential Revision:	https://reviews.freebsd.org/D5123
2016-01-30 01:00:54 +00:00

129 lines
3.8 KiB
C

/*
* 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("$FreeBSD$");
/* FreeBSD/i386-specific system call handling. */
#include <sys/ptrace.h>
#include <sys/syscall.h>
#include <machine/reg.h>
#include <machine/psl.h>
#include <stdio.h>
#include <sysdecode.h>
#include "truss.h"
static int
i386_fetch_args(struct trussinfo *trussinfo, u_int narg)
{
struct ptrace_io_desc iorequest;
struct reg regs;
struct current_syscall *cs;
lwpid_t tid;
unsigned int parm_offset;
tid = trussinfo->curthread->tid;
cs = &trussinfo->curthread->cs;
if (ptrace(PT_GETREGS, tid, (caddr_t)&regs, 0) < 0) {
fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
return (-1);
}
parm_offset = regs.r_esp + sizeof(int);
/*
* FreeBSD has two special kinds of system call redirections --
* SYS_syscall, and SYS___syscall. The former is the old syscall()
* routine, basically; the latter is for quad-aligned arguments.
*
* The system call argument count and code from ptrace() already
* account for these, but we need to skip over the first argument.
*/
switch (regs.r_eax) {
case SYS_syscall:
parm_offset += sizeof(int);
break;
case SYS___syscall:
parm_offset += sizeof(quad_t);
break;
}
iorequest.piod_op = PIOD_READ_D;
iorequest.piod_offs = (void *)parm_offset;
iorequest.piod_addr = cs->args;
iorequest.piod_len = narg * sizeof(unsigned long);
ptrace(PT_IO, tid, (caddr_t)&iorequest, 0);
if (iorequest.piod_len == 0)
return (-1);
return (0);
}
static int
i386_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)&regs, 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);
return (0);
}
static struct procabi i386_freebsd = {
"FreeBSD ELF32",
SYSDECODE_ABI_FREEBSD,
i386_fetch_args,
i386_fetch_retval
};
PROCABI(i386_freebsd);
static struct procabi i386_freebsd_aout = {
"FreeBSD a.out",
SYSDECODE_ABI_FREEBSD,
i386_fetch_args,
i386_fetch_retval
};
PROCABI(i386_freebsd_aout);