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cmd/compile: update ABI document for riscv64

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The duff device has been dropped on riscv64, we can
remove related documentation now.

Change-Id: Iffe5093bde6854bca236e290b91ab9f48d3f8c06
Reviewed-on: https://go-review.googlesource.com/c/go/+/728901
Reviewed-by: Mark Ryan <markdryan@rivosinc.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Joel Sing <joel@sing.id.au>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
This commit is contained in:
Meng Zhuo 2025-12-10 21:08:01 +08:00 committed by David Chase
parent 245bcdd478
commit 927c89bbc5
1 changed files with 2 additions and 4 deletions
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6
src/cmd/compile/abi-internal.md
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@ -799,17 +799,15 @@ assembly code are as follows:
| X2 | Stack pointer | Same | Same |
| X3 | Global pointer | Same | Used by dynamic linker |
| X4 | TLS (thread pointer) | TLS | Scratch |
| X24,X25 | Scratch | Scratch | Used by duffcopy, duffzero |
| X26 | Closure context pointer | Scratch | Scratch |
| X27 | Current goroutine | Same | Same |
| X31 | Scratch | Scratch | Scratch |
*Rationale*: These register meanings are compatible with Go’s
stack-based calling convention. Context register X20 will change to X26,
duffcopy, duffzero register will change to X24, X25 before this register ABI been adopted.
stack-based calling convention.
X10 – X17, X8, X9, X18 – X23, is the same order as A0 – A7, S0 – S7 in platform ABI.
F10 – F17, F8, F9, F18 – F23, is the same order as FA0 – FA7, FS0 – FS7 in platform ABI.
X8 – X23, F8 – F15 are used for compressed instruction (RVC) which will benefit code size in the future.
X8 – X23, F8 – F15 are used for compressed instruction (RVC) which benefits code size.
#### Stack layout