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jeremybenn |
/* common-i386.h -- Assembler routines used in rec_i386.h and op_i386.h
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Copyright (C) 2005 György `nog' Jeney, nog@sdf.lonestar.org
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This file is part of OpenRISC 1000 Architectural Simulator.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* This is needed because we can't move an mmx register to a general purpose
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* register. */
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static union {
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struct {
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uint32_t low32;
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uint32_t high32;
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} val3232;
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uint64_t val64;
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} useless_x86;
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/* Sets the PC with a specified value */
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static void set_pc(oraddr_t pc)
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{
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/* I could just use pc as a memory argument, but if I do that then gcc may put
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* the value of pc onto the stack, in which case gcc would also shift the
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* stack twice, which would result in two add 4, %esp instructions and a
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* mov %eax, *%esp, which would not only be slow but it would take up more
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* space. */
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asm("movq %%mm0, %0\n"
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"\tmovl %2, %1\n"
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"\tmovq %3, %%mm0"
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: "=m" (useless_x86.val64),
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"=m" (useless_x86.val3232.high32)
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: "r" (pc),
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"m" (useless_x86.val64));
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}
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/* Returns the current value of the pc */
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static oraddr_t get_pc(void)
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{
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asm("movq %%mm0, %0" : "=m" (useless_x86.val64));
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return useless_x86.val3232.high32;
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}
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/* Updates the runtime.sim.cycles counter */
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static void upd_sim_cycles(void)
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{
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asm volatile ("movq %%mm0, %0\n" : "=m" (useless_x86.val64));
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runtime.sim.cycles += scheduler.job_queue->time - useless_x86.val3232.low32;
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scheduler.job_queue->time = useless_x86.val3232.low32;
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cpu_state.pc = useless_x86.val3232.high32;
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}
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