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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("$FreeBSD$");
/* FreeBSD/amd64-freebsd32-specific system call handling. */
#include <sys/ptrace.h>
#include <sys/syscall.h>
#include <machine/reg.h>
#include <machine/psl.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <sysdecode.h>
#include "truss.h"
static int
amd64_freebsd32_fetch_args(struct trussinfo *trussinfo, u_int narg)
{
struct ptrace_io_desc iorequest;
struct reg regs;
struct current_syscall *cs;
unsigned int args32[narg];
unsigned long parm_offset;
lwpid_t tid;
u_int i;
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);
}
parm_offset = regs.r_rsp + 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_rax) {
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 = args32;
iorequest.piod_len = sizeof(args32);
ptrace(PT_IO, tid, (caddr_t)&iorequest, 0);
if (iorequest.piod_len == 0) {
return (-1);
}
for (i = 0; i < narg; i++)
cs->args[i] = args32[i];
return (0);
}
static int
amd64_freebsd32_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);
return (0);
}
static struct procabi amd64_freebsd32 = {
"FreeBSD ELF32",
SYSDECODE_ABI_FREEBSD32,
amd64_freebsd32_fetch_args,
amd64_freebsd32_fetch_retval,
STAILQ_HEAD_INITIALIZER(amd64_freebsd32.extra_syscalls),
{ NULL }
};
PROCABI(amd64_freebsd32);
static struct procabi amd64_freebsd32_aout = {
"FreeBSD a.out",
SYSDECODE_ABI_FREEBSD32,
amd64_freebsd32_fetch_args,
amd64_freebsd32_fetch_retval,
STAILQ_HEAD_INITIALIZER(amd64_freebsd32.extra_syscalls),
{ NULL }
};
PROCABI(amd64_freebsd32_aout);
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