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elmo.c
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/*
* University of Bristol – Open Access Software Licence
* Copyright (c) 2016, The University of Bristol, a chartered
* corporation having Royal Charter number RC000648 and a charity
* (number X1121) and its place of administration being at Senate
* House, Tyndall Avenue, Bristol, BS8 1TH, United Kingdom.
* All rights reserved
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Any use of the software for scientific publications or commercial
* purposes should be reported to the University of Bristol
* (OSI-notifications@bristol.ac.uk and quote reference 2668). This is
* for impact and usage monitoring purposes only.
*
* Enquiries about further applications and development opportunities
* are welcome. Please contact elisabeth.oswald@bristol.ac.uk
*/
/*
* ELMO is based on the Thumblator emmulator which can be found at:
* https://github.com/dwelch67/thumbulator.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <math.h>
#include <stdbool.h>
#include <stdint.h>
//#include "test/elmodefinestest.h"
#include "elmodefines.h"
#include "include/powermodel.h"
#include "include/fixedvsrandom.h"
#ifdef MASKFLOW
#include "include/maskflow.h"
#endif
#ifdef ENERGYMODEL
#include "include/energy.h"
#endif
#ifndef Pi
#define Pi 3.141592653589793238462643
#endif
// Abramowitz and Stegun "Handbook of Mathematical Functions" formula 26.2.23.
double RationalApproximation(double t)
{
double c[] = {2.515517, 0.802853, 0.010328};
double d[] = {1.432788, 0.189269, 0.001308};
return t - ((c[2]*t + c[1])*t + c[0]) /
(((d[2]*t + d[1])*t + d[0])*t + 1.0);
}
double NormalCDFInverse(double p)
{
if (p < 0.5)
{
return -RationalApproximation( sqrt(-2.0*log(p)) );
}
else
{
return RationalApproximation( sqrt(-2.0*log(1-p)) );
}
}
double gaussian_quantile(double alpha)
{
return NormalCDFInverse(1-alpha);
}
double gaussian_CDF(double x)
{
double L, K, w ;
/* constants */
double const a1 = 0.31938153, a2 = -0.356563782, a3 = 1.781477937;
double const a4 = -1.821255978, a5 = 1.330274429;
L = fabs(x);
K = 1.0 / (1.0 + 0.2316419 * L);
w = 1.0 - 1.0 / sqrt(2 * Pi) * exp(-L *L / 2) * (a1 * K + a2 * K *K + a3 * pow(K,3) + a4 * pow(K,4) + a5 * pow(K,5));
if (x < 0 ){
w= 1.0 - w;
}
return w;
}
//Automatically decide the number of traces for TVLA
/*int getsamplesize_standardTVLA(){
//formula (2) in Section3.pdf
double upper=(gaussian_quantile(Statistical_alpha)+gaussian_quantile(Statistical_beta))*(gaussian_quantile(Statistical_alpha)+gaussian_quantile(Statistical_beta))*2*Model_Variance;
double lower=EffectiveSize*EffectiveSize;
double N=2*floor(upper/lower);//Multiply 2 to counter the statistic effect
//Set a minimal value for N
if(N<50)
N=50;
printf("ES=%lf, alpha=%lf, beta=%lf, N=%lf\n",EffectiveSize,Statistical_alpha,Statistical_beta,N);
return (int)N;
}
*/
//-------------------------------------------------------------------
//Calculate the statistical power of the TVLA test under given number of traces
//Caution note: as ELMO is a determinstic simulation, this beta might not be accurate
double TVLA_power()
{
//Formula (8) in the notes
double z_alpha=gaussian_quantile(Statistical_alpha/2.0);
double z_beta=sqrt(N)*EffectiveSize/2.0-z_alpha;
return 1-gaussian_CDF(z_beta);
}
// Linked list functions for maskflow
#ifdef MEMORY_EXTENSION
void update_memorybus(dataflow *item, unsigned int readvalue, bool read, unsigned int writevalue, bool write)
{
if(read)
item->readbus=readvalue;
if(write)
item->writebus=writevalue;
}
#endif
#ifdef MASKFLOW
void initialise_dataflow(dataflow *item){
int i;
item -> op1 = 0;
item -> op2 = 0;
for(i=0;i<6;i++)
item -> instruction_type[i] = 0;
item -> op1_maskflow = zero_maskflow32();
item -> op2_maskflow = zero_maskflow32();
#ifdef MEMORY_EXTENSION
item -> readbus=0;
item -> writebus=0;
#endif
}
dataflow *create_dataflow(dataflow *item){
int i;
item -> next = malloc(sizeof(dataflow));
#ifdef MEMORY_EXTENSION
prev_read=item -> readbus;
prev_write=item -> writebus;
#endif
item = item -> next;
initialise_dataflow(item);
item -> next = NULL;
#ifdef MEMORY_EXTENSION
item -> readbus=prev_read;
item -> writebus=prev_write;
#endif
return item;
}
dataflow *update_dataflow(dataflow *item, unsigned int op1, unsigned int op2, unsigned int instruction_type, bit32_maskflow op1_maskflow, bit32_maskflow op2_maskflow){
int i;
item->op1 = op1;
item->op2 = op2;
for (i=0;i<32;i++){
item->op1_binary[i] = ((item->op1 >> i) & 0x00000001);
item->op2_binary[i] = ((item->op2 >> i) & 0x00000001);
}
item->instruction_type[instruction_type] = 1;
item->instruction_typedec = instruction_type;
item->op1_maskflow = op1_maskflow;
item->op2_maskflow = op2_maskflow;
// printf("%ud ", item->op1_maskflow);
// printf("%ud\n", item->op2_maskflow);
/*
for(i=31;i>=0;i--)
printf("%d", item->op1_maskflow[i]);
printf(" ");
for(i=31;i>=0;i--)
printf("%d", item->op2_maskflow[i]);
printf("\n");
*/
if(instruction_type == 2 | instruction_type == 3){
indexno += 2;
item->op1_maskflow = zero_maskflow32();
}
else
indexno++;
#ifdef DIFFTRACELENGTH
item = create_dataflow(item);
#else
if((t==1)||(item->next==NULL)){
item = create_dataflow(item);
if(t!=1)
printf("Trace Length Difference! Check your code...\n");
}
else{
item = item->next;
initialise_dataflow(item);
}
#endif
return item;
}
//-------------------------------------------------------------------
// Linked list functions for no maskflow
#else
void initialise_dataflow(dataflow *item){
int i;
item -> op1 = 0;
item -> op2 = 0;
for(i=0;i<6;i++)
item -> instruction_type[i] = 0;
#ifdef MEMORY_EXTENSION
item -> readbus=0;
item -> writebus=0;
#endif
}
dataflow *create_dataflow(dataflow *item){
item -> next = malloc(sizeof(dataflow));
#ifdef MEMORY_EXTENSION
unsigned int prev_read=item -> readbus;
unsigned int prev_write=item -> writebus;
#endif
item = item -> next;
initialise_dataflow(item);
item -> next = NULL;
#ifdef MEMORY_EXTENSION
item -> readbus=prev_read;
item -> writebus=prev_write;
#endif
return item;
}
dataflow *update_dataflow(dataflow *item, unsigned int op1, unsigned int op2, unsigned int instruction_type){
int i;
item->op1 = op1;
item->op2 = op2;
for (i=0;i<32;i++){
item->op1_binary[i] = ((item->op1 >> i) & 0x00000001);
item->op2_binary[i] = ((item->op2 >> i) & 0x00000001);
}
item->instruction_type[instruction_type] = 1;
item->instruction_typedec = instruction_type;
// printf("%ud ", item->op1_maskflow);
// printf("%ud\n", item->op2_maskflow);
/*
for(i=31;i>=0;i--)
printf("%d", item->op1_maskflow[i]);
printf(" ");
for(i=31;i>=0;i--)
printf("%d", item->op2_maskflow[i]);
printf("\n");
*/
if(instruction_type == 2 | instruction_type == 3){
indexno += 2;
}
else
indexno++;
#ifdef DIFFTRACELENGTH
item = create_dataflow(item);
#else
if((t==1)||(item->next==NULL)){
item = create_dataflow(item);
if(t!=1)
printf("Trace Length Difference! Check your code...\n");
}
else{
#ifdef MEMORY_EXTENSION
unsigned int prev_read=item -> readbus;
unsigned int prev_write=item -> writebus;
#endif
item = item->next;
initialise_dataflow(item);
#ifdef MEMORY_EXTENSION
item -> readbus=prev_read;
item -> writebus=prev_write;
#endif
}
#endif
return item;
}
#endif
//-------------------------------------------------------------------
/*
unsigned int leakagetestfail(void){
unsigned int i, j, len_maskflow, len_fixedvsrandom, leakagetestfailno = 0, *fixedvsrandom, *maskflow;
FILE *fp_maskflow, *fp_fixedvsrandom;
char line[80];
fp_maskflow = fopen(MASKFLOWOUTPUTFILE, "r");
fp_fixedvsrandom = fopen(FIXEDVSRANDOMFILE, "r");
len_maskflow = gettracelength(fp_maskflow);
len_fixedvsrandom = gettracelength(fp_fixedvsrandom);
rewind(fp_maskflow);
rewind(fp_fixedvsrandom);
maskflow = malloc(len_maskflow*sizeof(int));
fixedvsrandom = malloc(len_fixedvsrandom*sizeof(int));
for(i=0;i<len_maskflow;i++){
fgets(line, 80, fp_maskflow);
sscanf(line, "%d", &maskflow[i]);
}
for(i=0;i<len_fixedvsrandom;i++){
fgets(line, 80, fp_fixedvsrandom);
// printf("%s\n", line);
sscanf(line, "%d", &fixedvsrandom[i]);
}
for(i=0;i<len_maskflow;i++)
for(j=0;j<len_fixedvsrandom; j++)
if(maskflow[i] == fixedvsrandom[j])
leakagetestfailno++;
fclose(fp_maskflow);
fclose(fp_fixedvsrandom);
free(maskflow);
free(fixedvsrandom);
return leakagetestfailno;
}
*/
//-------------------------------------------------------------------
void dump_counters ( void )
{
FILE *fp;
// Get trace length
fp = loadtrace(1);
tracelength = gettracelength(fp);
fclose(fp);
instructions = tracelength;
printf("\n########################################\n\nSUMMARY:\n");
if(CYCLEACCURATE) printf("cycle accurate model\n");
else printf("instruction accurate model\n");
printf("instructions/cylces %d\n",instructions);
#ifdef ENERGYMODEL
printf("total energy consumption %0.20f\n",energy);
#endif
//#ifdef AUTOTVLA
Statistical_beta=TVLA_power();
printf("User provided traces: %d\n",N);
printf("alpha=%0.5f, standardised effect size=%0.5f\n",Statistical_alpha,EffectiveSize);
printf("Power of the test=%0.5f\n",1-Statistical_beta);
//#endif
printf("first order fixed vs random fail instructions/cycles %d\n",leakyinstructionno);
#ifdef MASKFLOW
printf("second order fixed vs random instructions/cycles\n");
for(unsigned int i=0;i<no_masks;i++)
printf("mask %d: %d\n",i, maskfixedvsrandomfail[i]);
#endif
}
//-------------------------------------------------------------------
unsigned int fetch16 ( unsigned int addr )
{
unsigned int data;
fetches++;
if(DBUGFETCH) fprintf(stderr,"fetch16(0x%08X)=",addr);
if(registerdataflow && DBUG) fprintf(stderr,"fetch16(0x%08X)=",addr);
switch(addr&0xF0000000)
{
case 0x00000000: //ROM
addr&=ROMADDMASK;
//if(addr<0x50)
//{
// fprintf(stderr,"fetch16(0x%08X), abort\n",addr);
// exit(1);
//}
addr>>=1;
data=rom[addr];
if(DBUGFETCH) fprintf(stderr,"0x%04X\n",data);
if(registerdataflow && DBUG) fprintf(stderr,"0x%04X\n",data);
return(data);
case 0x10000000: //ROM
addr&=ROMADDMASK;
//if(addr<0x50)
//{
// fprintf(stderr,"fetch16(0x%08X), abort\n",addr);
// exit(1);
//}
addr>>=1;
data=rom[addr];
if(DBUGFETCH) fprintf(stderr,"0x%04X\n",data);
if(registerdataflow && DBUG) fprintf(stderr,"0x%04X\n",data);
return(data);
default: //RAM
addr&=RAMADDMASK;
addr>>=1;
data=ram[addr];
if(DBUGFETCH) fprintf(stderr,"0x%04X\n",data);
if(registerdataflow && DBUG) fprintf(stderr,"0x%04X\n",data);
return(data);
}
}
//-------------------------------------------------------------------
unsigned int fetch32 ( unsigned int addr )
{
unsigned int data;
if(DBUGFETCH) fprintf(stderr,"fetch32(0x%08X)=",addr);
if(registerdataflow && DBUG) fprintf(stderr,"fetch32(0x%08X)=",addr);
switch(addr&0xF0000000)
{
case 0x00000000: //ROM
if(addr<0x50)
{
data=read32(addr);
if(DBUGFETCH) fprintf(stderr,"0x%08X\n",data);
if(registerdataflow && DBUG) fprintf(stderr,"0x%08X\n",data);
if(addr==0x00000000) return(data);
if(addr==0x00000004) return(data);
if(addr==0x0000003C) return(data);
fprintf(stderr,"fetch32(0x%08X), abort pc = 0x%04X\n",addr,read_register(15));
exit(1);
}
case 0x10000000: //ROM
if(addr<0x50)
{
data=read32(addr);
if(DBUGFETCH) fprintf(stderr,"0x%08X\n",data);
if(registerdataflow && DBUG) fprintf(stderr,"0x%08X\n",data);
if(addr==0x00000000) return(data);
if(addr==0x00000004) return(data);
if(addr==0x0000003C) return(data);
fprintf(stderr,"fetch32(0x%08X), abort pc = 0x%04X\n",addr,read_register(15));
exit(1);
}
default: //RAM
//data=fetch16(addr+0);
//data|=((unsigned int)fetch16(addr+2))<<16;
data=read32(addr);
if(DBUGFETCH) fprintf(stderr,"0x%08X\n",data);
if(registerdataflow && DBUG) fprintf(stderr,"0x%08X\n",data);
return(data);
}
}
//-------------------------------------------------------------------
void write16 ( unsigned int addr, unsigned int data )
{
writes++;
if(registerdataflow && DBUG) fprintf(stderr,"write16(0x%08X,0x%04X)\n",addr,data);
// Assume write is to RAM
if(DBUGRAM) fprintf(stderr,"write16(0x%08X,0x%04X)\n",addr,data);
addr&=RAMADDMASK;
addr>>=1;
ram[addr]=data&0xFFFF;
return;
}
//-------------------------------------------------------------------
void write32 ( unsigned int addr, unsigned int data )
{
char str[500], filepath[500];
if(registerdataflow && DBUG) fprintf(stderr,"write32(0x%08X,0x%08X)\n",addr,data);
switch(addr&0xF0000000)
{
case 0xF0000000: //halt
tracenumber = (t-1);
#ifdef FIXEDVSRANDOM
if(fixedvsrandomtest){
tracenumber = (t-1)/2;
fixedvsrandom();
}
#endif
#ifdef ENERGYMODEL
getenergy();
#endif
dump_counters();
exit(0);
case 0xE0000000: //print byte
switch(addr)
{
case 0xE0000000:{
fprintf(uartout,"%02x\n",data);
//fflush(stdout);
fflush(uartout);
break;
}
case 0xE0000004:{ // trigger
registerdataflow = (data & 0x01);
if((t<tracestart)){
if(registerdataflow){
if(t%PRINTTRACENOINTERVAL == 0)
printf("GHOST TRACE NO: %010d\n", t);
dataptr = NULL;
asmoutput = NULL;
registerdataflow = 0;
}
else{
//freedataflow();
t++;
}
}
else{
if(registerdataflow){
if(t%PRINTTRACENOINTERVAL == 0)
printf("TRACE NO: %010d\n", t);
#ifdef DIFFTRACELENGTH
dataptr = create_dataflow(start);
#else
dataptr = start->next;
#endif
if(t==1 || PRINTALLASMTRACES){
strcpy(str, ASMOUTPUTFOLDER);
strcat(str, ASMOUTPUTFILE);
sprintf(filepath, str, t);
asmoutput = fopen(filepath, "w+");
}
}
else{
#ifdef POWERMODEL_HW
hwpowermodel();
#else
elmopowermodel();
#endif
#ifdef MASKFLOW
if (t==1) maskflowfailtest();
#endif
#ifdef DIFFTRACELENGTH
freedataflow();
#endif
indexno = 1;
if(t==1 || PRINTALLASMTRACES) fclose(asmoutput);
t++;
}
}
break;
}
case 0xE000E010:
{
unsigned int old;
old=systick_ctrl;
systick_ctrl = data&0x00010007;
if(((old&1)==0)&&(systick_ctrl&1))
{
//timer started, load count
systick_count=systick_reload;
}
break;
}
case 0xE000E014:
{
systick_reload=data&0x00FFFFFF;
break;
}
case 0xE000E018:
{
systick_count=data&0x00FFFFFF;
break;
}
case 0xE000E01C:
{
systick_calibrate=data&0x00FFFFFF;
break;
}
case 0xE0000040:
{
#ifdef MASKFLOW
set_mask_dataflow(data, start_mask_dataflow);
#endif
break;
}
case 0xE0000042:
{
#ifdef MASKFLOW
reset_maskflow();
#endif
break;
}
case 0xE0000044:
{
start_mask_dataflow = data;
break;
}
case 0xE0000046:
{
rewind(datafile);
break;
}
}
return;
default: // Do two write 16s
if(DBUGRAMW) fprintf(stderr,"write32(0x%08X,0x%08X)\n",addr,data);
write16(addr+0,(data>> 0)&0xFFFF);
write16(addr+2,(data>>16)&0xFFFF);
return;
}
}
//-----------------------------------------------------------------
unsigned int read16 ( unsigned int addr )
{
unsigned int data;
reads++;
if(registerdataflow && DBUG) fprintf(stderr,"read16(0x%08X)=",addr);
switch(addr&0xF0000000)
{
case 0x00000000: //ROM
addr&=ROMADDMASK;
addr>>=1;
data=rom[addr];
if(registerdataflow && DBUG) fprintf(stderr,"0x%04X\n",data);
return(data);
case 0x10000000: //ROM
addr&=ROMADDMASK;
addr>>=1;
data=rom[addr];
if(registerdataflow && DBUG) fprintf(stderr,"0x%04X\n",data);
return(data);
default: //RAM
if(DBUGRAM) fprintf(stderr,"read16(0x%08X)=",addr);
addr&=RAMADDMASK;
addr>>=1;
data=ram[addr];
if(registerdataflow && DBUG) fprintf(stderr,"0x%04X\n",data);
if(DBUGRAM) fprintf(stderr,"0x%04X\n",data);
return(data);
}
}
//-------------------------------------------------------------------
unsigned int read32 ( unsigned int addr )
{
unsigned int data;
size_t len = 50;
char *str;
str = (char *)malloc(len);
if(registerdataflow && DBUG) fprintf(stderr,"read32(0x%08X)=",addr);
switch(addr&0xF0000000)
{
case 0xE0000000:
{
switch(addr)
{
case 0xE000E010:
{
data = systick_ctrl;
systick_ctrl&=(~0x00010000);
free(str);
return(data);
}
case 0xE000E014:
{
data=systick_reload;
free(str);
return(data);
}
case 0xE000E018:
{
data=systick_count;
free(str);
return(data);
}
case 0xE000E01C:
{
data=systick_calibrate;
free(str);
return(data);
}
case 0xE1000000:
{
getline(&str, &len, datafile);
data = (int)strtol(str, NULL, 16);
//printf("%x\n", data);
free(str);
return(data);
}
case 0xE1000004:
{
data = rand();
fprintf(randdata,"%2x\n",data&0xFF);
free(str);
return(data);
}
case 0xE1000008:
{
data = t;
free(str);
return(data);
}
case 0xE100000C:
{
data = runcount;
free(str);
return(data);
}
case 0xE1000010://New ELMO library function: LoadNForTVLA(&N), return the automatically determined number of traces for one Fix-vs-Random Ttest
{
//data=getsamplesize_standardTVLA();
data=N;
free(str);
return(data);
}
}
}
default: //Do two read16s
if(DBUGRAMW) fprintf(stderr,"read32(0x%08X)=",addr);
data =read16(addr+0);
data|=((unsigned int)read16(addr+2))<<16;
if(registerdataflow && DBUG) fprintf(stderr,"0x%08X\n",data);
if(DBUGRAMW) fprintf(stderr,"0x%08X\n",data);
free(str);
return(data);
}
}
//-------------------------------------------------------------------
unsigned int read_register ( unsigned int reg )
{
unsigned int data;
reg&=0xF;
if(registerdataflow && DBUG) fprintf(stderr,"read_register(%u)=",reg);
if(DBUGREG) fprintf(stderr,"read_register(%u)=",reg);
data=reg_norm[reg];
if(reg==15)
{
if(data&1)
{
fprintf(stderr,"pc has lsbit set 0x%08X\n",data);
}
data&=~1;
}
if(registerdataflow && DBUG) fprintf(stderr,"0x%08X\n",data);
if(DBUGREG) fprintf(stderr,"0x%08X\n",data);
return(data);
}
//-------------------------------------------------------------------
void write_register ( unsigned int reg, unsigned int data )
{
reg&=0xF;
if(registerdataflow && DBUG) fprintf(stderr,"write_register(%u,0x%08X)\n",reg,data);
if(DBUGREG) fprintf(stderr,"write_register(%u,0x%08X)\n",reg,data);
if(reg==15) data&=~1;
reg_norm[reg]=data;
if(output_vcd)
{
unsigned int vv;
fprintf(fpvcd,"b");
for(vv=0x80000000;vv;vv>>=1)
{
if(vv&data) fprintf(fpvcd,"1"); else fprintf(fpvcd,"0");
}
fprintf(fpvcd," r%u\n",reg);
}
}
//-------------------------------------------------------------------
void do_zflag ( unsigned int x )
{
if(x==0) cpsr|=CPSR_Z; else cpsr&=~CPSR_Z;
}
//-------------------------------------------------------------------
void do_nflag ( unsigned int x )
{
if(x&0x80000000) cpsr|=CPSR_N; else cpsr&=~CPSR_N;
}
//-------------------------------------------------------------------
void do_cflag ( unsigned int a, unsigned int b, unsigned int c )
{
unsigned int rc;
cpsr&=~CPSR_C;
rc=(a&0x7FFFFFFF)+(b&0x7FFFFFFF)+c; //carry inbuses
rc = (rc>>31)+(a>>31)+(b>>31); //carry out
if(rc&2) cpsr|=CPSR_C;
}
//-------------------------------------------------------------------
void do_vflag ( unsigned int a, unsigned int b, unsigned int c )
{
unsigned int rc;
unsigned int rd;
cpsr&=~CPSR_V;
rc=(a&0x7FFFFFFF)+(b&0x7FFFFFFF)+c; //carry in
rc>>=31; //carry in in lsbit
rd=(rc&1)+((a>>31)&1)+((b>>31)&1); //carry out
rd>>=1; //carry out in lsbit
rc=(rc^rd)&1; //if carry in != carry out then signed overflow
if(rc) cpsr|=CPSR_V;
}
//-------------------------------------------------------------------
void do_cflag_bit ( unsigned int x )
{
if(x) cpsr|=CPSR_C; else cpsr&=~CPSR_C;
}
//-------------------------------------------------------------------
void do_vflag_bit ( unsigned int x )
{
if(x) cpsr|=CPSR_V; else cpsr&=~CPSR_V;
}
//-------------------------------------------------------------------
//-------------------------------------------------------------------
//-------------------------------------------------------------------
int execute ( void )
{
unsigned int pc;
unsigned int sp;
unsigned int inst;
unsigned int op1 = 0,op2 = 0;
unsigned int ra,rb,rc;
unsigned int rm,rd,rn,rs;
unsigned int op;
//if(fetches>400000) return(1);
pc=read_register(15);
if(handler_mode)
{
if((pc&0xF0000000)==0xF0000000)
{
unsigned int sp;
handler_mode = 0;
//fprintf(stderr,"--leaving handler\n");
sp=read_register(13);
write_register(0,read32(sp)); sp+=4;
write_register(1,read32(sp)); sp+=4;
write_register(2,read32(sp)); sp+=4;
write_register(3,read32(sp)); sp+=4;
write_register(12,read32(sp)); sp+=4;
write_register(14,read32(sp)); sp+=4;
pc=read32(sp); sp+=4;
cpsr=read32(sp); sp+=4;
write_register(13,sp);
}
}
if(systick_ctrl&1)
{
if(systick_count)
{
systick_count--;
}
else
{
systick_count=systick_reload;
systick_ctrl|=0x00010000;
}
}
if((systick_ctrl&3)==3)
{
if(systick_ctrl&0x00010000)
{
if(handler_mode==0)
{
unsigned int sp;
systick_ints++;
//fprintf(stderr,"--- enter systick handler\n");
sp=read_register(13);
sp-=4; write32(sp,cpsr);
sp-=4; write32(sp,pc);
sp-=4; write32(sp,read_register(14));
sp-=4; write32(sp,read_register(12));
sp-=4; write32(sp,read_register(3));
sp-=4; write32(sp,read_register(2));