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jimulator.cpp
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/**
* @file jimulator.cpp
* @author Lawrence Warren ([email protected])
* @brief The emulator associated with KoMo2.
* @version 1.6
* @date 2021-06-27
* @todo check long multiplications
* @todo Flag checking (immediate ?!)
* @todo Validation
* @todo interrupt enable behaviour on exceptions (etc.)
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/poll.h>
#include <time.h>
#include <unistd.h>
#include <signal.h>
#include <iostream>
#define uchar unsigned char
#define uint unsigned int
#define _(String) (String)
#define MAX_SERIAL_WORD 4
#define CLIENT_STATE_CLASS_MASK 0XC0
#define CLIENT_STATE_CLASS_STOPPED 0X40
#define CLIENT_STATE_CLASS_RUNNING 0X80
#define CLIENT_STATE_RESET 0X00
#define CLIENT_STATE_STOPPED 0X40
#define CLIENT_STATE_BREAKPOINT 0X41
#define CLIENT_STATE_WATCHPOINT 0X42
#define CLIENT_STATE_BYPROG 0X44
#define CLIENT_STATE_RUNNING 0X80
#define CLIENT_STATE_RUNNING_BL 0x81 // @@@ NEEDS UPDATE
#define CLIENT_STATE_RUNNING_SWI 0x81
#define CLIENT_STATE_STEPPING 0X82
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
/* The following defines possible instructions that can be sent to the board */
/* as 1 byte each. */
/* Board instructions unsigned char */
/* need work on */
typedef enum {
BR_NOP = 0x00,
BR_PING = 0x01,
BR_WOT_R_U = 0x02,
BR_RESET = 0x04,
BR_FR_WRITE = 0x12,
BR_FR_READ = 0x13,
BR_WOT_U_DO = 0x20,
BR_STOP = 0x21,
BR_PAUSE = 0x22,
BR_CONTINUE = 0x23,
BR_RTF_SET = 0x24,
BR_RTF_GET = 0x25,
BR_BP_WRITE = 0x30,
BR_BP_READ = 0x31,
BR_BP_SET = 0x32,
BR_BP_GET = 0x33,
BR_WP_WRITE = 0x34,
BR_WP_READ = 0x35,
BR_WP_SET = 0x36,
BR_WP_GET = 0x37,
} BR_Instruction;
#define NO_OF_BREAKPOINTS 32 // Max 32
#define NO_OF_WATCHPOINTS 4 // Max 32
#define RING_BUF_SIZE 64
typedef struct {
uint iHead;
uint iTail;
uchar buffer[RING_BUF_SIZE];
} ringBuffer;
struct pollfd pollfd;
// Local prototypes
void step();
void comm(struct pollfd*);
void emulSetup();
void saveState(uchar);
void initialise(uint, int);
void execute(uint);
// ARM execute
void dataOp(uint);
void clz(uint);
void transfer(uint);
void transferSBHW(uint);
void multiple(uint);
void branch(uint);
void mySystem(uint);
void undefined();
void breakpoint();
void mrs(uint);
void msr(uint);
void bx(uint, int);
void myMulti(uint);
void swap(uint);
void normalDataOp(uint, int);
void ldm(int, int, int, bool, bool);
void stm(int, int, int, bool, bool);
int checkWatchpoints(uint, int, int, int);
int transferOffset(int, int, int, bool);
int bReg(int, int*);
int bImmediate(int, int*);
int bitCount(uint, int*);
bool checkCC(int);
constexpr const bool zf(const int);
constexpr const bool cf(const int);
constexpr const bool nf(const int);
constexpr const bool vf(const int);
void setFlags(int, int, int, int, int);
void setNZ(uint);
void setCF(uint, uint, int);
void setVF_ADD(int, int, int);
void setVF_SUB(int, int, int);
int getRegister(int, int);
/* Returns PC+4 for ARM & PC+2 for Thumb */
int getRegisterMonitor(int, int);
void putRegister(int, int, int);
constexpr const int instructionLength(const int, const int);
uint fetch();
void incPC();
void endianSwap(uint, uint);
int readMemory(uint, int, bool, bool, int);
void writeMemory(uint, int, int, bool, int);
/* THUMB execute */
void data0(uint);
void data1(uint);
void dataTransfer(uint);
void transfer0(uint);
void transfer1(uint);
void spPC(uint);
void lsmB(uint);
void thumbBranch(uint);
int loadFPE();
void FPEInstall();
int getNumber(char*);
int lsl(int, int, int*);
int lsr(uint, int, int*);
int asr(int, int, int*);
int ror(uint, int, int*);
uint getmem32(int);
void setmem32(int, uint);
void executeInstruction();
int getChar(uchar*);
int sendChar(uchar);
int sendNBytes(int, int);
int getNBytes(int*, int);
int getCharArray(int, uchar*);
int sendCharArray(int, uchar*);
void boardreset();
void initBuffer(ringBuffer*);
int countBuffer(ringBuffer*);
bool putBuffer(ringBuffer*, const uchar);
bool getBuffer(ringBuffer*, uchar*);
// Why add "RAMSIZE", and then get it wrong?!?!
// Memory is modulo this to the monitor; excise and use the proper routines
constexpr const uint memSize = 0X100000; // 4 MB
constexpr const uint RAMSIZE = 0X100000; // 4 MB
constexpr const uint reserved_mem = 0X002000; // 32 KB
constexpr const uint userStack = (memSize - reserved_mem) << 2;
constexpr const uint stackStringAddr = 0X00007000; // ARM address
constexpr const uint maxInstructions = 10000000;
constexpr const uint nfMask = 0X80000000;
constexpr const uint zfMask = 0X40000000;
constexpr const uint cfMask = 0X20000000;
constexpr const uint vfMask = 0X10000000;
constexpr const uint ifMask = 0X00000080;
constexpr const uint ffMask = 0X00000040;
constexpr const uint modeMask = 0X0000001F;
constexpr const uint tfMask = 0X00000020; // THUMB bit
constexpr const uint bit31 = 0X80000000;
constexpr const uint bit0 = 0X00000001;
constexpr const uint immMask = 0X02000000; // original word versions
constexpr const uint immHwMask = 0X00400000; // half word versions
constexpr const uint dataOpMask = 0X01E00000; // ALU function code
constexpr const uint dataExtMask = 0X01900000; // To sort out CMP from MRS
constexpr const uint arithExt = 0X01000000; // Poss. arithmetic extension
constexpr const uint sMask = 0X00100000;
constexpr const uint rnMask = 0X000F0000;
constexpr const uint rdMask = 0X0000F000;
constexpr const uint rsMask = 0X00000F00;
constexpr const uint rmMask = 0X0000000F;
constexpr const uint op2Mask = 0X00000FFF;
constexpr const uint hwMask = 0X00000020;
constexpr const uint signMask = 0X00000040;
constexpr const uint mulMask = 0X0FC000F0;
constexpr const uint longMulMask = 0X0F8000F0;
constexpr const uint mulOp = 0X00000090;
constexpr const uint longMulOp = 0X00800090;
constexpr const uint mulAccBit = 0X00200000;
constexpr const uint mulSignBit = 0X00400000;
constexpr const uint mulLongBit = 0X00800000;
constexpr const uint sbhwMask = 0X0E000FF0;
constexpr const uint swpMask = 0X0FB00FF0;
constexpr const uint swpOp = 0X01000090;
constexpr const uint preMask = 0X01000000;
constexpr const uint upMask = 0X00800000;
constexpr const uint byteMask = 0X00400000;
constexpr const uint writeBackMask = 0X00200000;
constexpr const uint loadMask = 0X00100000;
constexpr const uint byteSign = 0X00000080;
constexpr const uint hwSign = 0X00008000;
constexpr const uint userMask = 0X00400000;
constexpr const uint linkMask = 0X01000000;
constexpr const uint branchField = 0X00FFFFFF;
constexpr const uint branchSign = 0X00800000;
constexpr const uint undefMask = 0X0E000010;
constexpr const uint undefCode = 0X06000010;
constexpr const int memSystem = 0; // sources for memory read
constexpr const int memInstruction = 1;
constexpr const int memData = 2;
constexpr const int flagAdd = 1;
constexpr const int flagSub = 2;
constexpr const uint userMode = 0x00000010;
constexpr const uint fiqMode = 0x00000011;
constexpr const uint irqMode = 0x00000012;
constexpr const uint supMode = 0x00000013;
constexpr const uint abtMode = 0x00000017;
constexpr const uint undefMode = 0x0000001B;
constexpr const uint systemMode = 0x0000001F;
constexpr const uint regCurrent = 0; // Value forces accesses to specific bank
constexpr const uint regUser = 1; // or system
constexpr const uint regSvc = 2;
constexpr const uint regFiq = 3;
constexpr const uint regIrq = 4;
constexpr const uint regAbt = 5;
constexpr const uint regUndef = 6;
constexpr const uint REGSIZE = 65536;
typedef struct {
int state;
uchar cond;
uchar size;
int addrA;
int addrB;
int dataA[2];
int dataB[2];
} BreakElement;
constexpr const uint WOTLEN_FEATURES = 1;
constexpr const uint WOTLEN_MEM_SEGS = 1;
constexpr const uint WOTLEN = (8 + 3 * WOTLEN_FEATURES + 8 * WOTLEN_MEM_SEGS);
/**
* @brief
*/
uchar whatAreYou[] = {
WOTLEN - 1, // Length of rest of record HERE
(WOTLEN - 3) & 0xFF,
((WOTLEN - 3) >> 8) & 0xFF, // Length of rest of message (H)
1,
0,
0, // Processor type (B, H)
WOTLEN_FEATURES, // Feature count (B)
0,
9,
0, // Feature ID (B, H)
WOTLEN_MEM_SEGS, // Memory segment count (B)
0x00,
0x00,
0x00,
0x00, // Memory segment address (W)
memSize & 0xFF,
(memSize >> 8) & 0xFF, // Memory segment
(memSize >> 16) & 0xFF,
(memSize >> 24) & 0xFF}; // length (W)
BreakElement breakpoints[NO_OF_BREAKPOINTS];
BreakElement watchpoints[NO_OF_WATCHPOINTS];
uint emulBPFlag[2];
uint emulWPFlag[2];
uchar memory[RAMSIZE];
uchar status, oldStatus;
int stepsToGo; // Number of left steps before halting (0 is infinite)
uint stepsReset; // Number of steps since last reset
char runFlags;
uchar rtf;
bool breakpointEnable; // Breakpoints will be checked
bool breakpointEnabled; // Breakpoints will be checked now
bool runThroughBL; // Treat BL as a single step
bool runThroughSWI; // Treat SWI as a single step
uint tubeAddress;
int r[16];
int fiqR[7];
int irqR[2];
int supR[2];
int abtR[2];
int underR[2];
uint cpsr;
uint spsr[32]; // Lots of wasted space - safe for any "mode"
bool printOut;
int runUntilPC, runUntilSP, runUntilMode; // Used to determine when
uchar runUntilStatus; // to finish a `stepped' subroutine, SWI, etc.
uint exceptionPara[9];
int nextFileHandle;
FILE*(fileHandle[20]);
int count;
uint lastAddr;
int glob1, glob2;
int pastOpcAddr[32]; // History buffer of fetched op. code addresses
int pastSize; // Used size of buffer
int pastOpcPtr; // Pointer into same
int pastCount; // Count of hits in instruction history
// Thumb stuff
int PC;
int BLPrefix, BLAddress;
int ARMFlag;
struct pollfd* SWIPoll; // Pointer to allow SWI to scan input - YUK!
ringBuffer terminal0Tx, terminal0Rx;
ringBuffer terminal1Tx, terminal1Rx;
ringBuffer* terminalTable[16][2];
/**
* @brief Program entry point.
* @return int Exit code.
*/
int main(int argc, char** argv) {
for (int i = 0; i < 16; i++) {
terminalTable[i][0] = NULL;
terminalTable[i][1] = NULL;
}
initBuffer(&terminal0Tx); // Initialise terminal
initBuffer(&terminal0Rx);
terminalTable[0][0] = &terminal0Tx;
terminalTable[0][1] = &terminal0Rx;
initBuffer(&terminal1Tx); // Initialise terminal
initBuffer(&terminal1Rx);
terminalTable[1][0] = &terminal1Tx;
terminalTable[1][1] = &terminal1Rx;
pollfd.fd = 0;
pollfd.events = POLLIN;
SWIPoll = &pollfd; // Grubby pass to "mySystem"
emulSetup();
emulBPFlag[0] = 0;
if (NO_OF_BREAKPOINTS == 0) {
emulBPFlag[1] = 0x00000000; // C work around
} else {
emulBPFlag[1] = (1 << NO_OF_WATCHPOINTS) - 1;
}
emulWPFlag[0] = 0;
if (NO_OF_WATCHPOINTS == 0) {
emulWPFlag[1] = 0x00000000; // C work around
} else {
emulWPFlag[1] = (1 << NO_OF_WATCHPOINTS) - 1;
}
while (true) {
// If there is no parent process, exit. This stops MacIguana from leaving
// orphaned jimulators about taking up 100% CPU.
// https://stackoverflow.com/a/9153003
if (kill(getppid(), 0) == -1 && errno == ESRCH) {
exit(0);
}
comm(&pollfd); // Check for monitor command
if ((status & CLIENT_STATE_CLASS_MASK) == CLIENT_STATE_CLASS_RUNNING) {
step(); // Step emulator as required
} else {
int pollRes = poll(&pollfd, 1, -1); // If not running, deschedule until command arrives
if (pollRes < 0) {
std::cerr << "Poll failed!" << std::endl;
exit(1);
}
}
}
return 0;
}
/**
* @brief
*/
void step() {
oldStatus = status;
executeInstruction();
// Still running - i.e. no breakpoint (etc.) found
if ((status & CLIENT_STATE_CLASS_MASK) == CLIENT_STATE_CLASS_RUNNING) {
// don't count the instructions from now
if (status == CLIENT_STATE_RUNNING_SWI) {
if ((getRegisterMonitor(15, regCurrent) == runUntilPC) &&
(getRegisterMonitor(13, regCurrent) == runUntilSP) &&
((getRegisterMonitor(16, regCurrent) & 0x3F) == runUntilMode)) {
status = runUntilStatus;
}
} // This can have changed status - hence no "else" below`
// OR _BL
if (status != CLIENT_STATE_RUNNING_SWI) {
// Count steps unless inside routine
stepsReset++;
// Stepping
if (stepsToGo > 0) {
stepsToGo--; // If -decremented- to reach zero, stop
if (stepsToGo == 0) {
status = CLIENT_STATE_STOPPED;
}
}
}
}
if ((status & CLIENT_STATE_CLASS_MASK) != CLIENT_STATE_CLASS_RUNNING) {
breakpointEnabled = false; // No longer running - allow "continue"
}
}
/**
* @brief
* @param command
*/
void monitorOptionsMisc(uchar command) {
uchar tempchar;
int temp;
switch (command & 0x3F) {
case BR_NOP:
break;
case BR_PING:
if (write(1, "OK00", 4) < 0) {
std::cerr << "Some error occurred!" << std::endl;
}
break;
case BR_WOT_R_U:
sendCharArray(whatAreYou[0], &whatAreYou[1]);
break;
case BR_RESET:
boardreset();
break;
case BR_RTF_GET:
sendChar(rtf);
break;
case BR_RTF_SET:
getChar(&rtf);
break;
case BR_WOT_U_DO:
sendChar(status);
sendNBytes(stepsToGo, 4);
sendNBytes(stepsReset, 4);
break;
case BR_PAUSE:
case BR_STOP:
if ((status & CLIENT_STATE_CLASS_MASK) == CLIENT_STATE_CLASS_RUNNING) {
oldStatus = status;
status = CLIENT_STATE_STOPPED;
}
break;
case BR_CONTINUE:
if (((status & CLIENT_STATE_CLASS_MASK) == CLIENT_STATE_CLASS_STOPPED) &&
(status != CLIENT_STATE_BYPROG)) // Only act if already stopped
if ((oldStatus = CLIENT_STATE_STEPPING) || (stepsToGo != 0))
status = oldStatus;
break;
case BR_BP_GET:
sendNBytes(emulBPFlag[0], 4);
sendNBytes(emulBPFlag[1], 4);
break;
case BR_BP_SET: {
int data[2];
getNBytes(&data[0], 4);
getNBytes(&data[1], 4);
/* Note ordering to avoid temporary variable */
emulBPFlag[1] = (~emulBPFlag[0] & emulBPFlag[1]) |
(emulBPFlag[0] & ((emulBPFlag[1] & ~data[0]) | data[1]));
emulBPFlag[0] = emulBPFlag[0] & (data[0] | ~data[1]);
} break;
case BR_BP_READ:
getChar(&tempchar);
temp = tempchar;
sendChar(breakpoints[temp].cond);
sendChar(breakpoints[temp].size);
sendNBytes(breakpoints[temp].addrA, 4);
sendNBytes(breakpoints[temp].addrB, 4);
sendNBytes(breakpoints[temp].dataA[0], 4);
sendNBytes(breakpoints[temp].dataA[1], 4);
sendNBytes(breakpoints[temp].dataB[0], 4);
sendNBytes(breakpoints[temp].dataB[1], 4);
break;
case BR_BP_WRITE:
getChar(&tempchar);
temp = tempchar;
getChar(&breakpoints[temp].cond);
getChar(&breakpoints[temp].size);
getNBytes(&breakpoints[temp].addrA, 4);
getNBytes(&breakpoints[temp].addrB, 4);
getNBytes(&breakpoints[temp].dataA[0], 4);
getNBytes(&breakpoints[temp].dataA[1], 4);
getNBytes(&breakpoints[temp].dataB[0], 4);
getNBytes(&breakpoints[temp].dataB[1], 4);
/* add breakpoint */
temp = (1 << temp) & ~emulBPFlag[0];
emulBPFlag[0] |= temp;
emulBPFlag[1] |= temp;
break;
case BR_WP_GET:
sendNBytes(emulWPFlag[0], 4);
sendNBytes(emulWPFlag[1], 4);
break;
case BR_WP_SET: {
int data[2];
getNBytes(&data[0], 4);
getNBytes(&data[1], 4);
temp = data[1] & ~data[0];
emulWPFlag[0] &= ~temp;
emulWPFlag[1] |= temp;
temp = data[0] & emulWPFlag[0];
emulWPFlag[1] = (emulWPFlag[1] & ~temp) | (data[1] & temp);
} break;
case BR_WP_READ:
getChar(&tempchar);
temp = tempchar;
sendChar(watchpoints[temp].cond);
sendChar(watchpoints[temp].size);
sendNBytes(watchpoints[temp].addrA, 4);
sendNBytes(watchpoints[temp].addrB, 4);
sendNBytes(watchpoints[temp].dataA[0], 4);
sendNBytes(watchpoints[temp].dataA[1], 4);
sendNBytes(watchpoints[temp].dataB[0], 4);
sendNBytes(watchpoints[temp].dataB[1], 4);
break;
case BR_WP_WRITE:
getChar(&tempchar);
temp = tempchar;
getChar(&watchpoints[temp].cond);
getChar(&watchpoints[temp].size);
getNBytes(&watchpoints[temp].addrA, 4);
getNBytes(&watchpoints[temp].addrB, 4);
getNBytes(&watchpoints[temp].dataA[0], 4);
getNBytes(&watchpoints[temp].dataA[1], 4);
getNBytes(&watchpoints[temp].dataB[0], 4);
getNBytes(&watchpoints[temp].dataB[1], 4);
temp = 1 << temp & ~emulWPFlag[0];
emulWPFlag[0] |= temp;
emulWPFlag[1] |= temp;
break;
case BR_FR_WRITE: {
uchar device, length;
ringBuffer* pBuff;
getChar(&device);
pBuff = terminalTable[device][1];
getChar(&length);
temp = tempchar;
while (length-- > 0) {
getChar(&tempchar); /* Read character */
if (pBuff != NULL)
putBuffer(pBuff, tempchar); /* and put in buffer */
}
sendChar(0);
} break;
case BR_FR_READ: {
uchar device, max_length;
uint i, length, available;
ringBuffer* pBuff;
getChar(&device);
pBuff = terminalTable[device][0];
getChar(&max_length);
available = countBuffer(&terminal0Tx); /* See how many chars we have */
if (pBuff == NULL) {
length = 0; /* Kill if no corresponding buffer */
} else {
length = available < max_length ? available : max_length;
}
sendChar(length);
for (i = 0; i < length; i++) /* Send zero or more characters */
{
uchar c;
getBuffer(pBuff, &c);
sendChar(c);
}
} break;
default:
break;
}
}
/**
* @brief
* @param c
*/
void monitorMemory(uchar c) {
int addr;
uchar* pointer;
int size;
getNBytes(&addr, 4); // Start address really
if ((c & 0x30) == 0x10) {
int temp;
int reg_bank, reg_number;
switch (addr & 0xE0) {
case 0x00:
reg_bank = regCurrent;
break;
case 0x20:
reg_bank = regUser;
break;
case 0x40:
reg_bank = regSvc;
break;
case 0x60:
reg_bank = regAbt;
break;
case 0x80:
reg_bank = regUndef;
break;
case 0xA0:
reg_bank = regIrq;
break;
case 0xC0:
reg_bank = regFiq;
break;
default:
reg_bank = regCurrent;
break;
}
reg_number = addr & 0x1F;
getNBytes(&size, 2); /* Length of transfer */
while (size--)
if ((c & 8) != 0)
sendNBytes(getRegisterMonitor(reg_number++, reg_bank), 4);
else {
getNBytes(&temp, 4);
putRegister(reg_number++, temp, reg_bank);
}
} else {
pointer = memory + (addr & (RAMSIZE - 1));
getNBytes(&size, 2);
size *= 1 << (c & 7);
if (((uchar*)pointer + size) > ((uchar*)memory + RAMSIZE))
pointer -= RAMSIZE;
if (c & 8)
sendCharArray(size, pointer);
else
getCharArray(size, pointer);
}
}
/**
* @brief
* @param c
*/
void monitorBreakpoints(uchar c) {
runFlags = c & 0x3F;
breakpointEnable = (runFlags & 0x10) != 0;
breakpointEnabled = (runFlags & 0x01) != 0; /* Break straight away */
runThroughBL = (runFlags & 0x02) != 0;
runThroughSWI = (runFlags & 0x04) != 0;
getNBytes(&stepsToGo, 4);
if (stepsToGo == 0)
status = CLIENT_STATE_RUNNING;
else
status = CLIENT_STATE_STEPPING;
}
/**
* @brief
* @param pPollfd
*/
void comm(struct pollfd* pPollfd) {
uchar c;
int pollRes = poll(pPollfd, 1, 0);
if (pollRes < 0) {
std::cerr << "Poll failed!" << std::endl;
exit(1);
}
if (pollRes > 0) {
if (read(0, &c, 1) < 0) {
std::cerr << "Some error occurred!" << std::endl;
exit(1);
} // Look at error return - find EOF & exit
switch (c & 0xC0) {
case 0x00:
monitorOptionsMisc(c);
break;
case 0x40:
monitorMemory(c);
break;
case 0x80:
monitorBreakpoints(c);
break;
case 0xC0:
break;
}
}
}
/**
* @brief Get 1 character from host.
* @param toGet
* @return int
*/
int getChar(uchar* toGet) {
return getCharArray(1, toGet);
}
/**
* @brief Send 1 character to host
* @param toSend
* @return int
*/
int sendChar(uchar toSend) {
return sendCharArray(1, &toSend);
}
/**
* @brief Sends N bytes from the supplied value to the host (??), LSB first.
* @param value
* @param N
* @return int The number of bytes believed received successfully (i.e. N=>"Ok")
*/
int sendNBytes(int value, int N) {
uchar buffer[MAX_SERIAL_WORD];
int i;
if (N > MAX_SERIAL_WORD)
N = MAX_SERIAL_WORD; /* Clip, just in case ... */
for (i = 0; i < N; i++) {
buffer[i] = value & 0xFF; /* Byte into buffer */
value = value >> 8; /* Get next byte */
}
return sendCharArray(N, buffer);
}
/**
* @brief Gets N bytes from the host (??) into the indicated val_ptr, LSB first.
* @param valPtr
* @param N
* @return int The number of bytes received successfully (i.e. N=>"Ok")
*/
int getNBytes(int* valPtr, int N) {
uchar buffer[MAX_SERIAL_WORD];
int i, No_received;
if (N > MAX_SERIAL_WORD) {
N = MAX_SERIAL_WORD; // Clip, just in case ...
}
No_received = getCharArray(N, buffer);
*valPtr = 0;
for (i = 0; i < No_received; i++) {
*valPtr = *valPtr | ((buffer[i] & 0xFF) << (i * 8)); /* Assemble integer */
}
return No_received;
}
/**
* @brief Reads a character array from buffer. Sends charNumber number of
* characters given by dataPtr.
* @param charNumber
* @param dataPtr
* @return int Number of bytes received.
*/
int getCharArray(int charNumber, uchar* dataPtr) {
int ret = charNumber;
int replycount = 0;
struct pollfd pollfd;
// The number of zero-reads that we get. If this value exceeds 10,000,000, we
// assume that the program has timed-out.
int zeroReads = 0;
pollfd.fd = 0;
pollfd.events = POLLIN;
while (charNumber) {
int pollRes = poll(&pollfd, 1, -1);
if (pollRes < 0) {
std::cerr << "Poll failed!" << std::endl;
exit(1);
}
if (!pollRes) {
return ret - charNumber;
}
replycount = read(0, dataPtr, charNumber);
if (replycount < 0) {
std::cerr << "Read failed!" << std::endl;
exit(1);
replycount = 0;
}
if (replycount == 0) {
zeroReads++;
} else {
zeroReads = 0;
}
if (zeroReads > 10000000) {
std::cerr << "Haven't read anything in a while, assuming timeout" << std::endl;
exit(1);
}
charNumber -= replycount;
dataPtr += replycount;
}
return ret;
}
/**
* @brief writes an array of bytes in the buffer.
* @param charNumber number of bytes given by dataPtr
* @param dataPtr points to the beginning of the sequence to be sent
* @return int
*/
int sendCharArray(int charNumber, uchar* dataPtr) {
if (write(1, dataPtr, charNumber) < 0) {
std::cerr << "Some error occurred!" << std::endl;
}
return charNumber; // send char array to the board
}
/**
* @brief
*/
void emulSetup() {
glob1 = 0;
glob2 = 0;
for (int i = 0; i < 32; i++) {
pastOpcAddr[i] = 1; // Illegal op. code address
}
pastOpcPtr = 0;
pastCount = 0;
pastSize = 4;
int initialMode = 0xC0 | supMode;
printOut = false;
nextFileHandle = 1;
initialise(0, initialMode);
}
/**
* @brief
* @param instrAddr
* @param instr
* @return true
* @return false
*/
bool checkBreakpoint(uint instrAddr, uint instr) {
bool mayBreak = false;
for (int i = 0; (i < NO_OF_BREAKPOINTS) && !mayBreak; i++) {
mayBreak = ((emulBPFlag[0] & emulBPFlag[1] & (1 << i)) !=
0); // Breakpoint is active
// Try address comparison
if (mayBreak) {
switch (breakpoints[i].cond & 0x0C) {
case 0x00:
case 0x04:
mayBreak = false;
break;
// Case of between address A and address B
case 0x08:
if ((instrAddr < breakpoints[i].addrA) ||
(instrAddr > breakpoints[i].addrB)) {
mayBreak = false;
}
break;
// case of mask
case 0x0C:
if ((instrAddr & breakpoints[i].addrB) != breakpoints[i].addrA) {
mayBreak = false;
}
break;
}
}
// Try data comparison
if (mayBreak) {
switch (breakpoints[i].cond & 0x03) {
case 0x00:
mayBreak = false;
break;
case 0x01:
mayBreak = false;
break;
case 0x02: // Case of between data A and data B
if ((instr < breakpoints[i].dataA[0]) ||
(instr > breakpoints[i].dataB[0])) {
mayBreak = false;
}
break;
case 0x03: // Case of mask
if ((instr & breakpoints[i].dataB[0]) != breakpoints[i].dataA[0]) {
mayBreak = false;
}
break;
}
}
}
return mayBreak;
}
/**
* @brief
*/
void executeInstruction() {
int i;