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[/] [openrisc/] [trunk/] [or1ksim/] [cpu/] [or32/] [common-i386.h] - Rev 179
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/* common-i386.h -- Assembler routines used in rec_i386.h and op_i386.h Copyright (C) 2005 György `nog' Jeney, nog@sdf.lonestar.org This file is part of OpenRISC 1000 Architectural Simulator. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ /* This is needed because we can't move an mmx register to a general purpose * register. */ static union { struct { uint32_t low32; uint32_t high32; } val3232; uint64_t val64; } useless_x86; /* Sets the PC with a specified value */ static void set_pc(oraddr_t pc) { /* I could just use pc as a memory argument, but if I do that then gcc may put * the value of pc onto the stack, in which case gcc would also shift the * stack twice, which would result in two add 4, %esp instructions and a * mov %eax, *%esp, which would not only be slow but it would take up more * space. */ asm("movq %%mm0, %0\n" "\tmovl %2, %1\n" "\tmovq %3, %%mm0" : "=m" (useless_x86.val64), "=m" (useless_x86.val3232.high32) : "r" (pc), "m" (useless_x86.val64)); } /* Returns the current value of the pc */ static oraddr_t get_pc(void) { asm("movq %%mm0, %0" : "=m" (useless_x86.val64)); return useless_x86.val3232.high32; } /* Updates the runtime.sim.cycles counter */ static void upd_sim_cycles(void) { asm volatile ("movq %%mm0, %0\n" : "=m" (useless_x86.val64)); runtime.sim.cycles += scheduler.job_queue->time - useless_x86.val3232.low32; scheduler.job_queue->time = useless_x86.val3232.low32; cpu_state.pc = useless_x86.val3232.high32; }
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