+/*
+ * 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++;
+ }
+ }
}
