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Updates to Cheats documentation (#1568)
* docs: update cheats doc to clarify Code Type 5 encoding This change removes references to the "M" nibble for the "Register Address" encoding of Code Type 5 whis is not used in this mode. In the dword block the "M" has been replaced with a "0" * docs: update cheats doc to clarify register usage on Code Type 5 This adds additional clarification for "Register Address Encoding" mode of Code Type 5 that the "R" nibble reflects both the destination as well as the base memory address. * docs: update cheats doc to make Code Types consistent Code Types are now consistently written in hex notation.
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tslater2006
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1 changed files with 29 additions and 30 deletions
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@ -40,8 +40,8 @@ The following provides documentation of the instruction format for the virtual m
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Typically, instruction type is encoded in the upper nybble of the first instruction u32.
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### Code Type 0: Store Static Value to Memory
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Code type 0 allows writing a static value to a memory address.
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### Code Type 0x0: Store Static Value to Memory
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Code type 0x0 allows writing a static value to a memory address.
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#### Encoding
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`0TMR00AA AAAAAAAA VVVVVVVV (VVVVVVVV)`
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@ -54,8 +54,8 @@ Code type 0 allows writing a static value to a memory address.
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---
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### Code Type 1: Begin Conditional Block
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Code type 1 performs a comparison of the contents of memory to a static value.
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### Code Type 0x1: Begin Conditional Block
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Code type 0x1 performs a comparison of the contents of memory to a static value.
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If the condition is not met, all instructions until the appropriate conditional block terminator are skipped.
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@ -78,16 +78,16 @@ If the condition is not met, all instructions until the appropriate conditional
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---
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### Code Type 2: End Conditional Block
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Code type 2 marks the end of a conditional block (started by Code Type 1 or Code Type 8).
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### Code Type 0x2: End Conditional Block
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Code type 0x2 marks the end of a conditional block (started by Code Type 0x1 or Code Type 0x8).
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#### Encoding
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`20000000`
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---
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### Code Type 3: Start/End Loop
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Code type 3 allows for iterating in a loop a fixed number of times.
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### Code Type 0x3: Start/End Loop
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Code type 0x3 allows for iterating in a loop a fixed number of times.
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#### Start Loop Encoding
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`300R0000 VVVVVVVV`
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@ -102,8 +102,8 @@ Code type 3 allows for iterating in a loop a fixed number of times.
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---
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### Code Type 4: Load Register with Static Value
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Code type 4 allows setting a register to a constant value.
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### Code Type 0x4: Load Register with Static Value
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Code type 0x4 allows setting a register to a constant value.
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#### Encoding
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`400R0000 VVVVVVVV VVVVVVVV`
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@ -113,8 +113,8 @@ Code type 4 allows setting a register to a constant value.
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---
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### Code Type 5: Load Register with Memory Value
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Code type 5 allows loading a value from memory into a register, either using a fixed address or by dereferencing the destination register.
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### Code Type 0x5: Load Register with Memory Value
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Code type 0x5 allows loading a value from memory into a register, either using a fixed address or by dereferencing the destination register.
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#### Load From Fixed Address Encoding
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`5TMR00AA AAAAAAAA`
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@ -125,17 +125,16 @@ Code type 5 allows loading a value from memory into a register, either using a f
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+ A: Immediate offset to use from memory region base.
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#### Load from Register Address Encoding
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`5TMR10AA AAAAAAAA`
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`5T0R10AA AAAAAAAA`
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+ T: Width of memory read (1, 2, 4, or 8 bytes).
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+ M: Memory region to write to (0 = Main NSO, 1 = Heap).
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+ R: Register to load value into.
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+ R: Register to load value into. (This register is also used as the base memory address).
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+ A: Immediate offset to use from register R.
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---
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### Code Type 6: Store Static Value to Register Memory Address
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Code type 6 allows writing a fixed value to a memory address specified by a register.
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### Code Type 0x6: Store Static Value to Register Memory Address
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Code type 0x6 allows writing a fixed value to a memory address specified by a register.
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#### Encoding
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`6T0RIor0 VVVVVVVV VVVVVVVV`
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@ -149,10 +148,10 @@ Code type 6 allows writing a fixed value to a memory address specified by a regi
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---
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### Code Type 7: Legacy Arithmetic
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Code type 7 allows performing arithmetic on registers.
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### Code Type 0x7: Legacy Arithmetic
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Code type 0x7 allows performing arithmetic on registers.
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However, it has been deprecated by Code type 9, and is only kept for backwards compatibility.
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However, it has been deprecated by Code type 0x9, and is only kept for backwards compatibility.
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#### Encoding
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`7T0RC000 VVVVVVVV`
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@ -171,8 +170,8 @@ However, it has been deprecated by Code type 9, and is only kept for backwards c
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---
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### Code Type 8: Begin Keypress Conditional Block
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Code type 8 enters or skips a conditional block based on whether a key combination is pressed.
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### Code Type 0x8: Begin Keypress Conditional Block
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Code type 0x8 enters or skips a conditional block based on whether a key combination is pressed.
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#### Encoding
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`8kkkkkkk`
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@ -213,8 +212,8 @@ Note: This is the direct output of `hidKeysDown()`.
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---
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### Code Type 9: Perform Arithmetic
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Code type 9 allows performing arithmetic on registers.
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### Code Type 0x9: Perform Arithmetic
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Code type 0x9 allows performing arithmetic on registers.
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#### Register Arithmetic Encoding
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`9TCRS0s0`
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@ -248,8 +247,8 @@ Code type 9 allows performing arithmetic on registers.
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---
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### Code Type 10: Store Register to Memory Address
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Code type 10 allows writing a register to memory.
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### Code Type 0xA: Store Register to Memory Address
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Code type 0xA allows writing a register to memory.
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#### Encoding
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`ATSRIOxa (aaaaaaaa)`
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@ -272,13 +271,13 @@ Code type 10 allows writing a register to memory.
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---
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### Code Type 11: Reserved
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Code Type 11 is currently reserved for future use.
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### Code Type 0xB: Reserved
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Code Type 0xB is currently reserved for future use.
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---
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### Code Type 12-15: Extended-Width Instruction
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Code Types 12-15 signal to the VM to treat the upper two nybbles of the first dword as instruction type, instead of just the upper nybble.
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### Code Type 0xC-0xF: Extended-Width Instruction
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Code Types 0xC-0xF signal to the VM to treat the upper two nybbles of the first dword as instruction type, instead of just the upper nybble.
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This reserves an additional 64 opcodes for future use.
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