60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
/** @file binary_util.c
|
|
* @brief Implementation of utility functions for binary manipulation.
|
|
*
|
|
* @author Saleh Bubshait
|
|
* @author Themis Demetriades
|
|
*/
|
|
|
|
#include <assert.h>
|
|
#include "binary_util.h"
|
|
|
|
word getBits(word wrd, uint8_t lsb, uint8_t msb) {
|
|
|
|
// Ensure LSB and MSB are within range of word size, and in the correct order
|
|
assert(lsb < msb && msb <= WORD_BITS);
|
|
|
|
wrd &= ((dword) 1 << msb) - 1;
|
|
return wrd >> lsb;
|
|
}
|
|
|
|
dword max(dword a, dword b) {
|
|
return a > b ? a : b;
|
|
}
|
|
|
|
dword truncateValue(dword value, a64inst_regType regType) {
|
|
if (regType == a64inst_X) {
|
|
return value;
|
|
} else {
|
|
return (word)value;
|
|
}
|
|
}
|
|
|
|
int64_t signExtend(dword value, unsigned int n) {
|
|
if (n == 0 || n >= 64) {
|
|
// If n_bits is 0 or greater than or equal to 64, return the value as is
|
|
return (int64_t)value;
|
|
}
|
|
|
|
uint64_t sign_bit_mask = (uint64_t)1 << (n - 1);
|
|
|
|
// Mask to isolate the n-bit value
|
|
uint64_t n_bit_mask = (sign_bit_mask << 1) - 1;
|
|
|
|
// Check if the sign bit is set
|
|
if (value & sign_bit_mask) {
|
|
// Sign bit is set, extend the sign
|
|
return (int64_t)(value | ~n_bit_mask);
|
|
} else {
|
|
// Sign bit is not set, return the value as is
|
|
return (int64_t)(value & n_bit_mask);
|
|
}
|
|
}
|
|
|
|
dword getMSBPos(a64inst_regType regType) {
|
|
return (regType ? DWORD_BITS : WORD_BITS) - 1;
|
|
}
|
|
|
|
uint8_t getMSB(dword value, a64inst_regType regType) {
|
|
return (value >> getMSBPos(regType)) & 1u;
|
|
}
|