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90 lines
2.7 KiB
C
90 lines
2.7 KiB
C
/*-
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* Copyright (c) 2006 Marcel Moolenaar
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <machine/frame.h>
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#include <machine/md_var.h>
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#include <ia64/disasm/disasm.h>
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int
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ia64_emulate(struct trapframe *tf, struct thread *td)
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{
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struct asm_bundle bundle;
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struct asm_inst *i;
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int slot;
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if (!asm_decode(tf->tf_special.iip, &bundle))
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return (SIGILL);
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slot = ((tf->tf_special.psr & IA64_PSR_RI) == IA64_PSR_RI_0) ? 0 :
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((tf->tf_special.psr & IA64_PSR_RI) == IA64_PSR_RI_1) ? 1 : 2;
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if (slot == 1 && bundle.b_templ[slot] == 'L')
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slot++;
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i = bundle.b_inst + slot;
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switch (i->i_op) {
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case ASM_OP_BRL:
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/*
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* We get the fault even if the predicate is false, so we
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* need to check the predicate first and simply advance to
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* the next bundle in that case.
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*/
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if (!(tf->tf_special.pr & (1UL << i->i_oper[0].o_value))) {
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tf->tf_special.psr &= ~IA64_PSR_RI;
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tf->tf_special.iip += 16;
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return (0);
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}
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/*
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* The brl.cond is the simplest form. We only have to set
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* the IP to the address in the instruction and return.
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*/
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if (i->i_cmpltr[0].c_type == ASM_CT_COND) {
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tf->tf_special.psr &= ~IA64_PSR_RI;
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tf->tf_special.iip += i->i_oper[1].o_value;
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return (0);
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}
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/* Sanity check... */
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if (i->i_cmpltr[0].c_type != ASM_CT_CALL)
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break;
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/*
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* The brl.call is more difficult as we need to set-up the
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* call properly.
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*/
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break;
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default:
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break;
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}
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return (SIGILL);
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}
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