X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?a=blobdiff_plain;f=palacios%2Fsrc%2Fpalacios%2Fvmm_decoder.c;h=4b88e67617e29781f59c5a896c995e7eae832984;hb=123a1ba27ea09c8fa77a1b36ce625b43d7c48b14;hp=9b8d91e4a55a34d32cb95e2034945e2084f74a5d;hpb=e6b4a2f11bae0faac9faedec12422385dcc39593;p=palacios.git

diff --git a/palacios/src/palacios/vmm_decoder.c b/palacios/src/palacios/vmm_decoder.c
index 9b8d91e..4b88e67 100644
--- a/palacios/src/palacios/vmm_decoder.c
+++ b/palacios/src/palacios/vmm_decoder.c
@@ -1,34 +1,111 @@
+/* 
+ * This file is part of the Palacios Virtual Machine Monitor developed
+ * by the V3VEE Project with funding from the United States National 
+ * Science Foundation and the Department of Energy.  
+ *
+ * The V3VEE Project is a joint project between Northwestern University
+ * and the University of New Mexico.  You can find out more at 
+ * http://www.v3vee.org
+ *
+ * Copyright (c) 2008, Jack Lange <jarusl@cs.northwestern.edu> 
+ * Copyright (c) 2008, The V3VEE Project <http://www.v3vee.org> 
+ * All rights reserved.
+ *
+ * Author: Jack Lange <jarusl@cs.northwestern.edu>
+ *
+ * This is free software.  You are permitted to use,
+ * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
+ */
+
+
 #include <palacios/vmm_decoder.h>
 
 
+int v3_opcode_cmp(const uchar_t * op1, const uchar_t * op2) {
+    if (op1[0] != op2[0]) {
+	return op1[0] - op2[0];;
+    } else {
+	return memcmp(op1 + 1, op2 + 1, op1[0]);
+    }
+}
+
+
+void v3_get_prefixes(uchar_t * instr, struct x86_prefixes * prefixes) {
+    while (1) {
+	switch (*instr) {
+	    case 0xF0:      // lock
+		prefixes->lock = 1;
+		break;
 
-/* The full blown instruction parser... */
-int v3_parse_instr(struct guest_info * info,
-		   char * instr_ptr,
-		   uint_t * instr_length, 
-		   struct x86_operand * src_operand,
-		   struct x86_operand * dst_operand,
-		   struct x86_operand * extra_operand) {
+	    case 0xF2:      // REPNE/REPNZ
+		prefixes->repnz = 1;
+		prefixes->repne = 1;
+		break;
 
-  V3_Assert(src_operand != NULL);
-  V3_Assert(dst_operand != NULL);
-  V3_Assert(extra_operand != NULL);
-  V3_Assert(instr_length != NULL);
-  V3_Assert(info != NULL);
+	    case 0xF3:      // REP or REPE/REPZ
+		prefixes->rep = 1;
+		prefixes->repe = 1;
+		prefixes->repz = 1; 
+		break;
 
-  
-  // Ignore prefixes for now
-  while (is_prefix_byte(*instr)) {
-    instr++;
-    *instr_length++;
-  }
+	    case 0x2E:      // CS override or Branch hint not taken (with Jcc instrs)
+		prefixes->cs_override = 1;
+		prefixes->br_not_taken = 1;
+		break;
 
+	    case 0x36:      // SS override
+		prefixes->ss_override = 1;
+		break;
 
-  // Opcode table lookup, see xen/kvm
+	    case 0x3E:      // DS override or Branch hint taken (with Jcc instrs)
+		prefixes->ds_override = 1;
+		prefixes->br_taken = 1;
+		break;
 
+	    case 0x26:      // ES override
+		prefixes->es_override = 1;
+		break;
 
+	    case 0x64:      // FS override
+		prefixes->fs_override = 1;
+		break;
+      
+	    case 0x65:      // GS override
+		prefixes->gs_override = 1;
+		break;
 
+	    case 0x66:      // operand size override
+		prefixes->op_size = 1;
+		break;
+
+	    case 0x67:    // address size override
+		prefixes->addr_size = 1;
+		break;
+
+	    default:
+		return;
+	}
+
+	instr++;
+    }
+
+}
 
+void v3_strip_rep_prefix(uchar_t * instr, int length) {
+    int read_ctr = 0;
+    int write_ctr = 0;
+    int found = 0;
 
-  return 0;
+    while (read_ctr < length) {
+	if ((!found) && 
+	    ( (instr[read_ctr] == 0xF2) ||
+	      (instr[read_ctr] == 0xF3))) {
+	    read_ctr++;
+	    found = 1;
+	} else {
+	    instr[write_ctr] = instr[read_ctr];
+	    write_ctr++;
+	    read_ctr++;
+	}
+    }
 }