From: Jack Lange <jacklange@cs.pitt.edu>
Date: Thu, 10 Mar 2011 18:37:32 +0000 (-0600)
Subject: added initial 64 bit decoding support
X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?a=commitdiff_plain;h=a71f35bcb2dc587326be18345adb1ad1d81b9435;p=palacios.git

added initial 64 bit decoding support
---

diff --git a/palacios/include/palacios/vmm_decoder.h b/palacios/include/palacios/vmm_decoder.h
index 7f05064..c03de83 100644
--- a/palacios/include/palacios/vmm_decoder.h
+++ b/palacios/include/palacios/vmm_decoder.h
@@ -62,6 +62,13 @@ struct x86_prefixes {
     uint_t br_taken   : 1;  // 0x3E
     uint_t op_size     : 1;  // 0x66
     uint_t addr_size   : 1;  // 0x67
+	struct  {
+		uint_t rm        : 1;  // REX.B
+		uint_t sib_idx   : 1;  // REX.X
+		uint_t reg       : 1;  // REX.R
+		uint_t op_size   : 1;  // REX.W
+		uint8_t rsvd     : 4;
+	} __attribute__((packed)) rex;
 } __attribute__((packed));
 
 
@@ -119,7 +126,6 @@ void v3_strip_rep_prefix(uint8_t * instr, int length);
 uint8_t v3_get_prefixes(uint8_t * instr, struct x86_prefixes * prefixes);
 
 
-
 void v3_print_instr(struct x86_instr * instr);
 
 
diff --git a/palacios/include/palacios/vmm_instr_decoder.h b/palacios/include/palacios/vmm_instr_decoder.h
index 1c292a3..aa106b6 100644
--- a/palacios/include/palacios/vmm_instr_decoder.h
+++ b/palacios/include/palacios/vmm_instr_decoder.h
@@ -140,11 +140,16 @@ static int get_addr_width(struct guest_info * info, struct x86_instr * instr) {
     switch (v3_get_vm_cpu_mode(info)) {
 	case REAL:
 	    return (instr->prefixes.addr_size) ? 4 : 2;
+	case LONG:
+		return 8;
 	case PROTECTED:
 	case PROTECTED_PAE:
-	    return (instr->prefixes.addr_size) ? 2 : 4;
 	case LONG_32_COMPAT:
-	case LONG:
+		if (info->segments.cs.db) {
+			return (instr->prefixes.addr_size) ? 2 : 4;
+		} else {
+			return (instr->prefixes.addr_size) ? 4 : 2;
+		}			
 	default:
 	    PrintError("Unsupported CPU mode: %d\n", info->cpu_mode);
 	    return -1;
@@ -251,14 +256,22 @@ static int get_operand_width(struct guest_info * info, struct x86_instr * instr,
 	case OR_IMM2SX_8:
 	case SUB_IMM2SX_8:
 	case XOR_IMM2SX_8:
-	    switch (v3_get_vm_cpu_mode(info)) {
+	switch (v3_get_vm_cpu_mode(info)) {
 		case REAL:
 		    return (instr->prefixes.op_size) ? 4 : 2;
+		case LONG:
+			if (instr->prefixes.rex.op_size) {
+				return 8;
+			}
 		case PROTECTED:
 		case PROTECTED_PAE:
-		    return (instr->prefixes.op_size) ? 2 : 4;
 		case LONG_32_COMPAT:
-		case LONG:
+			if (info->segments.cs.db) {
+				// default is 32
+				return (instr->prefixes.op_size) ? 2 : 4;
+			} else {
+				return (instr->prefixes.op_size) ? 4 : 2;
+			}
 		default:
 		    PrintError("Unsupported CPU mode: %d\n", info->cpu_mode);
 		    return -1;
@@ -271,9 +284,11 @@ static int get_operand_width(struct guest_info * info, struct x86_instr * instr,
 		    return 0;
 		case PROTECTED:
 		case PROTECTED_PAE:
-		    return 4;
 		case LONG_32_COMPAT:
+
+			return 4;
 		case LONG:
+			return 8;
 		default:
 		    PrintError("Unsupported CPU mode: %d\n", info->cpu_mode);
 		    return -1;
@@ -286,9 +301,10 @@ static int get_operand_width(struct guest_info * info, struct x86_instr * instr,
 		    return 2;
 		case PROTECTED:
 		case PROTECTED_PAE:
-		    return 4;
 		case LONG_32_COMPAT:
+			return 4;
 		case LONG:
+			return 8;
 		default:
 		    PrintError("Unsupported CPU mode: %d\n", info->cpu_mode);
 		    return -1;
@@ -302,9 +318,11 @@ static int get_operand_width(struct guest_info * info, struct x86_instr * instr,
 		case REAL:
 		case PROTECTED:
 		case PROTECTED_PAE:
-		    return 4;
 		case LONG_32_COMPAT:
+
+			return 4;
 		case LONG:
+			return 8;
 		default:
 		    PrintError("Unsupported CPU mode: %d\n", info->cpu_mode);
 		    return -1;
@@ -746,7 +764,13 @@ static int decode_rm_operand32(struct guest_info * core,
 }
 
 
-
+int decode_rm_operand64(struct guest_info * core, uint8_t * instr_ptr, 
+					struct x86_instr * instr, struct x86_operand * operand, 
+					uint8_t * reg_code) {
+					
+					
+	return 0;
+}
 
 
 static int decode_rm_operand(struct guest_info * core, 
@@ -759,8 +783,10 @@ static int decode_rm_operand(struct guest_info * core,
 
     if (mode == REAL) {
 	return decode_rm_operand16(core, instr_ptr, instr, operand, reg_code);
-    } else if ((mode == PROTECTED) || (mode == PROTECTED_PAE)) {
+    } else if ((mode == PROTECTED) || (mode == PROTECTED_PAE) || (mode == LONG_32_COMPAT)) {
 	return decode_rm_operand32(core, instr_ptr, instr, operand, reg_code);
+	} else if (mode == LONG) {
+		return decode_rm_operand64(core, instr_ptr, instr, operand, reg_code);
     } else {
 	PrintError("Invalid CPU_MODE (%d)\n", mode);
 	return -1;
diff --git a/palacios/src/palacios/vmm_v3dec.c b/palacios/src/palacios/vmm_v3dec.c
index 7dd716e..0b0d7a4 100644
--- a/palacios/src/palacios/vmm_v3dec.c
+++ b/palacios/src/palacios/vmm_v3dec.c
@@ -78,7 +78,13 @@ int v3_decode(struct guest_info * core, addr_t instr_ptr, struct x86_instr * ins
     length = v3_get_prefixes((uint8_t *)instr_ptr, &(instr->prefixes));
 
 
-    // check for REX prefix
+	// REX prefix
+	if (v3_get_vm_cpu_mode(core) == LONG) {
+	    if ((*(uint8_t *)(instr_ptr + length) & 0xf0) == 0x40) {
+			*(uint8_t *)&(instr->prefixes.rex) = *(uint8_t *)(instr_ptr + length);
+			length += 1;
+		}
+	}
 
 
     form = op_code_to_form((uint8_t *)(instr_ptr + length), &length);