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add a basic structure for disassembler + executor

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Instructions added
Branch and Exchange (BX)
Branch and Link (B)
Multiply and Accumulate (MUL, MLA)
Multiply Long and Accumulate (SMULL, SMLAL, UMULL, UMLAL)
Single data swap (SWP)
[WIP] Halfword Transfer (STRH, LDRH)

Signed-off-by: Amneesh Singh <natto@weirdnatto.in>
This commit is contained in:
Amneesh Singh
2023-09-13 03:44:36 +05:30
parent 904e2b698e
commit 8a04eade92
22 changed files with 571 additions and 50 deletions
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13
src/util/bits.hh
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@@ -8,7 +8,7 @@ using std::size_t;
template<std::integral Int>
inline bool
get_nth_bit(Int num, size_t n) {
return (1 && (num >> n));
return (num >> n) & 1;
}
template<std::integral Int>
@@ -26,14 +26,15 @@ rst_nth_bit(Int& num, size_t n) {
template<std::integral Int>
inline void
chg_nth_bit(Int& num, size_t n, bool x) {
num ^= (num ^ -x) & 1 << n;
num = (num & ~(1 << n)) | (x << n);
}
/// read range of bits from start to end inclusive
template<std::unsigned_integral Int>
template<std::integral Int>
inline Int
get_bit_range(Int& num, size_t start, size_t end) {
// NOTE: we do not require -1 if it is a signed integral (which it is not)
Int left = std::numeric_limits<Int>::digits - 1 - end;
get_bit_range(Int num, size_t start, size_t end) {
// NOTE: we do not require -1 if it is a signed integral
Int left =
std::numeric_limits<Int>::digits - (std::is_unsigned<Int>::value) - end;
return num << left >> (left + start);
}