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Implement NO$GBA debug registers. (#1110)

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* Implement NO$GBA debug registers.

NO$GBA comes with 4 debug registers that allow a ROM to print text to
the emulator terminal and 2 other status registers, one with the name of the
emulator and the other with the clock cycles count. This commit
implements them for the ARMv5 processor.

Some small things to note:
 - `NocashPrint` was changed and now it takes an address to _the string_ instead of the flags before it (those
don't do anything anyways).
 - The "Emulation ID" register contains the string "melonDS " followed by version, _not_ "NO$GBA"

* Fix styling issue and improve comment regarding NO$GBA message flags
This commit is contained in:
Pedro
2021-05-27 07:15:16 -03:00
committed by GitHub
parent 308e5df426
commit f74387a8c1
2 changed files with 50 additions and 6 deletions
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10
src/ARMInterpreter_ALU.cpp
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@ -661,7 +661,10 @@ void A_MOV_REG_LSL_IMM_DBG(ARM* cpu)
(cpu->NextInstr[0] & 0xFF000000) == 0xEA000000 && // branch
(cpu->NextInstr[1] & 0xFFFF) == 0x6464)
{
u32 addr = cpu->R[15] + 2;
// GBATek says the two bytes after the 2nd ID are _reserved_ for flags
// but since they serve no purpose ATTOW, we can skip them
u32 addr = cpu->R[15] + 4; // Skip 2nd ID and flags
// TODO: Pass flags to NocashPrint
NDS::NocashPrint(cpu->Num, addr);
}
}
@ -1527,7 +1530,10 @@ void T_MOV_HIREG(ARM* cpu)
(cpu->NextInstr[0] & 0xF800) == 0xE000 && // branch
(cpu->NextInstr[1] & 0xFFFF) == 0x6464)
{
u32 addr = cpu->R[15] + 2;
// GBATek says the two bytes after the 2nd ID are _reserved_ for flags
// but since they serve no purpose ATTOW, we can skip them
u32 addr = cpu->R[15] + 4; // Skip 2nd ID and flags
// TODO: Pass flags to NocashPrint
NDS::NocashPrint(cpu->Num, addr);
}
}