X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?a=blobdiff_plain;f=palacios%2Fsrc%2Fpalacios%2Fvmm_decoder.c;h=54c77c431d889242ca3bcc8c0cc498e886414136;hb=da0f0deecf22754656bad2a95640461ec3ac4f1d;hp=593b038ab3fc6ba2b142af8bfd880eeeb26ede56;hpb=a4b3e0ab8dc52d98a7d9b65541d7c3c4e825b17c;p=palacios.git

diff --git a/palacios/src/palacios/vmm_decoder.c b/palacios/src/palacios/vmm_decoder.c
index 593b038..54c77c4 100644
--- a/palacios/src/palacios/vmm_decoder.c
+++ b/palacios/src/palacios/vmm_decoder.c
@@ -30,6 +30,67 @@ int v3_opcode_cmp(const uchar_t * op1, const uchar_t * op2) {
 }
 
 
+void v3_get_prefixes(uchar_t * instr, struct x86_prefixes * prefixes) {
+  while (1) {
+    switch (*instr) {
+    case 0xF0:      // lock
+      prefixes->lock = 1;
+      break;
+
+    case 0xF2:      // REPNE/REPNZ
+      prefixes->repnz = 1;
+      prefixes->repne = 1;
+      break;
+
+    case 0xF3:      // REP or REPE/REPZ
+      prefixes->rep = 1;
+      prefixes->repe = 1;
+      prefixes->repz = 1; 
+      break;
+
+    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;
+
+    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;