dolphin_read64
Reads an unsigned 64-bit big-endian value from PowerPC memory at an 8-byte aligned address. Returns the result as a decimal string to preserve precision beyond 2^53.
Instructions
PURPOSE: Read an unsigned 64-bit big-endian value from PowerPC memory at the given absolute address. USAGE: For paired 32-bit slots, doubles, packed flags. PowerPC is 32-bit so true 64-bit fields are less common than on PS2 — usually game state is 32-bit. Use this when you actually have a 64-bit field, not as a convenience for two 32-bit reads. BEHAVIOR: No side effects — pure read. Address MUST be 8-byte aligned. The result is returned as a decimal STRING (not a JSON number) to preserve precision past 2^53. Returns an error on unmapped address, bridge disconnect, or FAIL.
GameCube + Wii main address space landmarks (PowerPC, big-endian): 0x80000000-0x817FFFFF MEM1 main RAM (24 MiB) — GameCube + Wii game code & data GameCube games stay entirely within MEM1. Wii games use MEM1 for code and frequently-accessed data. 0x80000020 OS_GLOBALS — game-info struct (disc ID, FST, etc.) 0x80000034 OS_ARENA_LO (start of free MEM1 heap) 0x80003100 OS_REPORT (developer-console mirror, varies by SDK) 0x90000000-0x93FFFFFF MEM2 (64 MiB) — Wii ONLY. Larger texture/asset data, IOS work areas. Reading MEM2 on a GameCube game returns garbage / FAIL. 0xCC000000-0xCC00FFFF Hollywood I/O (Wii) / Flipper I/O (GameCube) — DMA, GPU FIFO, AI, EXI registers. Reads are usually safe, writes can wedge the emulator. Avoid. 0xCD000000-0xCD007FFF Wii-only Hollywood registers.
Notes: • All multi-byte values are BIG-ENDIAN on the real hardware. Felk's memory.read_u*/write_u* helpers handle the byte swap for you — the value you see is the value the game sees as a u32. • Addresses are 32-bit; Felk truncates the high bits of any u64 address argument. • Pointers in MEM1 are often stored as 4-byte addresses with the high bit set (e.g. 0x81234567). Dereferencing them requires no masking — pass the raw value back into memory.read_*.
RETURNS: Single line 'ADDR_HEX: VAL_DEC (0xVAL_HEX)' — VAL_DEC is a decimal string that may exceed 2^53.
Input Schema
| Name | Required | Description | Default |
|---|---|---|---|
| address | Yes | Absolute PowerPC virtual address (0x80000000-0x9FFFFFFF). Pass as a number; hex literals like 0x80001000 are fine. Reads 8 consecutive bytes starting here and interprets them as a big-endian value. MUST be 8-byte aligned (address % 8 === 0). PowerPC raises an alignment exception on misaligned access in hardware, but Dolphin's emulated bus is forgiving and silently returns the aligned-down word — i.e. you get the bytes from address & ~7, not what you asked for. For unaligned multi-byte reads use dolphin_read_range and assemble client-side. Useful ranges: 0x80000000-0x817FFFFF for MEM1 (GC + Wii), 0x90000000-0x93FFFFFF for MEM2 (Wii only). |