10dc260f0c
CONSOLIDATION.md Phase 6. Both lived untracked in the project root -- on one
disk, backed up by nothing.
tools/ppc-manual/ 393 files, 3.7 MB. 455 instructions, 350 family pages,
598 mnemonics resolvable through index.json, plus the
generator that produced them.
tools/run-canary.sh the oracle launcher.
🔴 THE LAUNCHER WAS BROKEN IN TWO WAYS AND IS REWRITTEN, not copied:
* it pointed at `xenia-rs/sylpheed.iso`, a SYMLINK. Wine cannot resolve one
and says "path invalid", which reads as a corrupt image rather than a path
problem -- it has cost a session before. It now points at the real file and
warns if handed a symlink.
* it hardcoded one machine's absolute paths, and named `xenia-rs`, which this
consolidation retires. Now derived from the script's own location, with
SYLPH_CANARY_BIN / SYLPH_ISO overrides and a check that each exists.
The standing constraints are in its header where someone will read them: one
emulator at a time, Canary runs MUTED, and never judge a crash or a hang from
a Bash-launched run -- a SIGKILL that looked like the binary was the editor's
process supervisor.
⚠️ The manual's GENERATOR reads the xenia-rs source tree, which is going away.
Its decoder now lives here as crates/sylpheed-ppc, so the generator must be
repointed before it is run again. Recorded in the README rather than left for
someone to discover; the manual's content is checked in and regenerates from
nothing implicitly.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
4.1 KiB
4.1 KiB
xori — XOR Immediate
Category: Integer ALU · Form: D · Opcode:
0x68000000
Assembler Mnemonics
| Mnemonic | XML entry | Flags | Description |
|---|---|---|---|
xori |
xori |
— | XOR Immediate |
Syntax
xori [RA], [RS], [UIMM]
Encoding
xori — form D
- Opcode word:
0x68000000 - Primary opcode (bits 0–5):
26 - Extended opcode: —
- Synchronising: no
| Bits | Field | Meaning |
|---|---|---|
| 0–5 | OPCD |
primary opcode |
| 6–10 | RT |
destination GPR (or RS when storing) |
| 11–15 | RA |
source GPR (0 ⇒ literal 0 for RA0 forms) |
| 16–31 | D/SI/UI |
16-bit signed or unsigned immediate |
Operands
| Field | Role | Description |
|---|---|---|
RS |
xori: read | Source GPR (alias for RD in some stores). |
UIMM |
xori: read | 16-bit unsigned immediate. Zero-extended. |
RA |
xori: write | Source GPR (r0–r31). |
Register Effects
xori
- Reads (always):
RS,UIMM - Reads (conditional): none
- Writes (always):
RA - Writes (conditional): none
Status-Register Effects
No condition-register or status-register effects.
Operation (pseudocode)
RA <- (RS) ^ (0x0000 || UIMM)
C Translation Example
/* C translation: the xenia-rs interpreter arm below in */
/* Implementation References is the authoritative semantic */
/* snapshot. Translate it line-by-line: */
/* - ctx.gpr[N] -> r[N] (or f[]/v[] for FPRs/VRs) */
/* - mem.read_u*/write_u* -> mem_read_u*_be / mem_write_u*_be */
/* - ctx.update_cr_signed(fld, v) -> update_cr_signed(fld, v) */
/* - ctx.xer_ca / xer_ov / xer_so -> xer.CA / xer.OV / xer.SO */
/* The Register Effects and Status-Register Effects tables above */
/* enumerate every side effect a faithful translation must emit. */
Implementation References
xori
- xenia-canary XML:
tools/ppc-instructions.xml— search formnem="xori" - xenia-canary emit:
src/xenia/cpu/ppc/ppc_emit_alu.cc:839 - xenia-rs opcode:
crates/xenia-cpu/src/opcode.rs:132 - xenia-rs decoder:
crates/xenia-cpu/src/decoder.rs:349 - xenia-rs interpreter:
crates/xenia-cpu/src/interpreter.rs:520-523
xenia-rs interpreter body (frozen snapshot)
PpcOpcode::xori => {
ctx.gpr[instr.ra()] = ctx.gpr[instr.rs()] ^ (instr.uimm16() as u64);
ctx.pc += 4;
}
Special Cases & Edge Conditions
- No record form. Like
ori, there is noxori.. To get a CR0 update follow withcmpwior usexorxwithRc=1. - Immediate is zero-extended to 64 bits. Only the low 16 bits of
RAcan be flipped; the high 48 bits are passed through fromRSunchanged. xori 0, 0, 0is a valid NOP encoding but the canonical NOP isori 0, 0, 0. Disassemblers should still display this asxori r0, r0, 0or recognise it as a no-op.- 64-bit operation in xenia-rs.
interpreter.rs:338— fullu64XOR with the immediate. - No
XER, noCRside effects. RA = 0readsr0(not literal zero); seeori.- Useful for masked toggle.
xori rA, rS, maskflips the bits ofrSindicated bymask(low 16 bits only).
Related Instructions
xoris— companion (immediate shifted left 16).xorx— register-register XOR.eqvx—~(RS ^ RB).ori,andix— sister immediate logicals.