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/*-
* Copyright (c) 2006 Marcel Moolenaar
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <machine/frame.h>
#include <machine/md_var.h>
#include <ia64/disasm/disasm.h>
int
ia64_emulate(struct trapframe *tf, struct thread *td)
{
struct asm_bundle bundle;
struct asm_inst *i;
int slot;
if (!asm_decode(tf->tf_special.iip, &bundle))
return (SIGILL);
slot = ((tf->tf_special.psr & IA64_PSR_RI) == IA64_PSR_RI_0) ? 0 :
((tf->tf_special.psr & IA64_PSR_RI) == IA64_PSR_RI_1) ? 1 : 2;
if (slot == 1 && bundle.b_templ[slot] == 'L')
slot++;
i = bundle.b_inst + slot;
switch (i->i_op) {
case ASM_OP_BRL:
/*
* We get the fault even if the predicate is false, so we
* need to check the predicate first and simply advance to
* the next bundle in that case.
*/
if (!(tf->tf_special.pr & (1UL << i->i_oper[0].o_value))) {
tf->tf_special.psr &= ~IA64_PSR_RI;
tf->tf_special.iip += 16;
return (0);
}
/*
* The brl.cond is the simplest form. We only have to set
* the IP to the address in the instruction and return.
*/
if (i->i_cmpltr[0].c_type == ASM_CT_COND) {
tf->tf_special.psr &= ~IA64_PSR_RI;
tf->tf_special.iip += i->i_oper[1].o_value;
return (0);
}
/* Sanity check... */
if (i->i_cmpltr[0].c_type != ASM_CT_CALL)
break;
/*
* The brl.call is more difficult as we need to set-up the
* call properly.
*/
break;
default:
break;
}
return (SIGILL);
}
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