diff options
Diffstat (limited to 'src/sim/id.cc')
| -rw-r--r-- | src/sim/id.cc | 36 |
1 files changed, 33 insertions, 3 deletions
diff --git a/src/sim/id.cc b/src/sim/id.cc index 37c6773..de412d4 100644 --- a/src/sim/id.cc +++ b/src/sim/id.cc @@ -86,7 +86,7 @@ void ID::get_instr_fields( break; case 0b10: t = J; - this->decode_J_type(s1, s2, s3); + this->decode_J_type(s1, s2, s3, m); break; case 0b11: t = INV; @@ -159,8 +159,10 @@ void ID::decode_I_type( this->status = r1; } -void ID::decode_J_type(signed int &s1, signed int &s2, signed int &s3) +void ID::decode_J_type( + signed int &s1, signed int &s2, signed int &s3, Mnemonic &m) { + Response r1, r2; unsigned int s0b, s1b; s0b = REG_SIZE; @@ -169,7 +171,35 @@ void ID::decode_J_type(signed int &s1, signed int &s2, signed int &s3) s2 = GET_BITS_SIGN_EXTEND(s1, s0b, s1b); s1 = GET_LS_BITS(s1, s0b); - this->status = this->read_guard(*&s1); + switch (m) { + case PUSH: + s2 = s1; // source + s3 = 2; // stack pointer + s1 = -1; // increment amount + r1 = this->read_guard(s2); + r2 = (this->is_checked_out(s3)) ? STALLED : OK; // we read the stack pointer + if (r1 == OK && r2 == OK) { + this->write_guard(s3); // we write the stack pointer + } + this->status = (r1 == OK && r2 == OK) ? OK : STALLED; + break; + case POP: + s2 = s1; // destination + s3 = 2; // stack pointer + s1 = 1; // increment amount + r1 = (this->is_checked_out(s3)) ? STALLED : OK; // we read the stack pointer + if (r1 == OK) { + this->write_guard(s2); + this->write_guard(s3); // we write the stack pointer + } + this->status = r1; + break; + default: + this->status = this->read_guard(*&s1); + } + + std::cout << m << ":" << this->status << std::endl; + } std::vector<int> ID::stage_info() |