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setPSW: limited if current(!) run-mode is !kernel

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folkert van heusden 2024-03-30 00:46:30 +01:00
parent c913cc3410
commit 1ef5211bc1
Signed by untrusted user who does not match committer: folkert
GPG key ID: 6B6455EDFEED3BD1
1 changed files with 4 additions and 6 deletions
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10
cpu.cpp
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@ -280,7 +280,7 @@ void cpu::setPSW(const uint16_t v, const bool limited)
if (limited)
psw = (v & 0174037) | (psw & 0174340);
else
psw = v & 0174377;
psw = v & 0174377; // mask off 'unused' bits (8-10)
}
void cpu::setPSW_flags_nzv(const uint16_t value, const word_mode_t word_mode)
@ -1327,9 +1327,7 @@ bool cpu::single_operand_instructions(const uint16_t instr)
mtpi_count++;
uint32_t a = word_mode == wm_byte ? phys.physical_data : phys.physical_instruction;
b->check_odd_addressing(a, run_mode, word_mode == wm_byte ? d_space : i_space, true);
b->writePhysical(a, v);
}
}
@ -1569,7 +1567,7 @@ bool cpu::misc_operations(const uint16_t instr)
case 0b0000000000000010: // RTI
setPC(popStack());
setPSW(popStack(), !!getPSW_prev_runmode());
setPSW(popStack(), !!getPSW_runmode());
return true;
case 0b0000000000000011: // BPT
@ -1582,7 +1580,7 @@ bool cpu::misc_operations(const uint16_t instr)
case 0b0000000000000110: // RTT
setPC(popStack());
setPSW(popStack(), !!getPSW_prev_runmode());
setPSW(popStack(), !!getPSW_runmode());
return true;
case 0b0000000000000111: // MFPT
@ -1701,7 +1699,7 @@ void cpu::trap(uint16_t vector, const int new_ipl, const bool is_interrupt)
}
// make sure the trap vector is retrieved from kernel space
psw &= 037777; // mask off 14/15 TODO: still required? readWord gets a d_space parameter
psw &= 037777; // mask off 14/15 to make it into kernel-space
setPC(b->readWord(vector + 0, d_space));