emulenv.cc revision 5966
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IN NO EVENT SHALL THE COPYRIGHT 474604Sgblack@eecs.umich.edu * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 484604Sgblack@eecs.umich.edu * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 494604Sgblack@eecs.umich.edu * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 504604Sgblack@eecs.umich.edu * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 514604Sgblack@eecs.umich.edu * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 524604Sgblack@eecs.umich.edu * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 534604Sgblack@eecs.umich.edu * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 544604Sgblack@eecs.umich.edu * 554604Sgblack@eecs.umich.edu * Authors: Gabe Black 564604Sgblack@eecs.umich.edu */ 574604Sgblack@eecs.umich.edu 585616Snate@binkert.org#include <cassert> 595616Snate@binkert.org 604604Sgblack@eecs.umich.edu#include "arch/x86/emulenv.hh" 614604Sgblack@eecs.umich.edu#include "base/misc.hh" 624604Sgblack@eecs.umich.edu 634604Sgblack@eecs.umich.eduusing namespace X86ISA; 644604Sgblack@eecs.umich.edu 654604Sgblack@eecs.umich.eduvoid EmulEnv::doModRM(const ExtMachInst & machInst) 664604Sgblack@eecs.umich.edu{ 674604Sgblack@eecs.umich.edu assert(machInst.modRM.mod != 3); 684604Sgblack@eecs.umich.edu //Use the SIB byte for addressing if the modrm byte calls for it. 694604Sgblack@eecs.umich.edu if (machInst.modRM.rm == 4 && machInst.addrSize != 2) { 704604Sgblack@eecs.umich.edu scale = 1 << machInst.sib.scale; 714712Sgblack@eecs.umich.edu index = machInst.sib.index | (machInst.rex.x << 3); 724712Sgblack@eecs.umich.edu base = machInst.sib.base | (machInst.rex.b << 3); 734604Sgblack@eecs.umich.edu //In this special case, we don't use a base. The displacement also 744604Sgblack@eecs.umich.edu //changes, but that's managed by the predecoder. 754604Sgblack@eecs.umich.edu if (machInst.sib.base == INTREG_RBP && machInst.modRM.mod == 0) 764604Sgblack@eecs.umich.edu base = NUM_INTREGS; 774604Sgblack@eecs.umich.edu //In -this- special case, we don't use an index. 784848Sgblack@eecs.umich.edu if (index == INTREG_RSP) 794604Sgblack@eecs.umich.edu index = NUM_INTREGS; 804604Sgblack@eecs.umich.edu } else { 814604Sgblack@eecs.umich.edu if (machInst.addrSize == 2) { 824604Sgblack@eecs.umich.edu warn("I'm not really using 16 bit MODRM like I'm supposed to!\n"); 834604Sgblack@eecs.umich.edu } else { 844604Sgblack@eecs.umich.edu scale = 0; 854712Sgblack@eecs.umich.edu base = machInst.modRM.rm | (machInst.rex.b << 3); 864604Sgblack@eecs.umich.edu if (machInst.modRM.mod == 0 && machInst.modRM.rm == 5) { 874712Sgblack@eecs.umich.edu //Since we need to use a different encoding of this 884712Sgblack@eecs.umich.edu //instruction anyway, just ignore the base in those cases 894848Sgblack@eecs.umich.edu base = NUM_INTREGS; 904604Sgblack@eecs.umich.edu } 914604Sgblack@eecs.umich.edu } 924604Sgblack@eecs.umich.edu } 934863Sgblack@eecs.umich.edu //Figure out what segment to use. This won't be entirely accurate since 944863Sgblack@eecs.umich.edu //the presence of a displacement is supposed to make the instruction 954863Sgblack@eecs.umich.edu //default to the data segment. 965570Snate@binkert.org if ((base != INTREG_RBP && base != INTREG_RSP) || 974863Sgblack@eecs.umich.edu 0/*Has an immediate offset*/) { 984863Sgblack@eecs.umich.edu seg = SEGMENT_REG_DS; 994863Sgblack@eecs.umich.edu //Handle any segment override that might have been in the instruction 1004863Sgblack@eecs.umich.edu int segFromInst = machInst.legacy.seg; 1014863Sgblack@eecs.umich.edu if (segFromInst) 1024863Sgblack@eecs.umich.edu seg = (SegmentRegIndex)(segFromInst - 1); 1034863Sgblack@eecs.umich.edu } else { 1044863Sgblack@eecs.umich.edu seg = SEGMENT_REG_SS; 1054863Sgblack@eecs.umich.edu } 1064604Sgblack@eecs.umich.edu} 1074604Sgblack@eecs.umich.edu 1085966Sgblack@eecs.umich.eduvoid EmulEnv::setSeg(const ExtMachInst & machInst) 1095966Sgblack@eecs.umich.edu{ 1105966Sgblack@eecs.umich.edu seg = SEGMENT_REG_DS; 1115966Sgblack@eecs.umich.edu //Handle any segment override that might have been in the instruction 1125966Sgblack@eecs.umich.edu int segFromInst = machInst.legacy.seg; 1135966Sgblack@eecs.umich.edu if (segFromInst) 1145966Sgblack@eecs.umich.edu seg = (SegmentRegIndex)(segFromInst - 1); 1155966Sgblack@eecs.umich.edu} 116