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| author | limeidan <limeidan@loongson.cn> | 2025-12-03 10:25:15 +0800 |
|---|---|---|
| committer | abner chenc <chenguoqi@loongson.cn> | 2026-03-18 18:08:52 -0700 |
| commit | 1e994e0a486afc976116e2d7a6ca7517fe150304 (patch) | |
| tree | 7c39b6354369d35f3177a116d92ad663ea5f5811 /src/cmd/internal | |
| parent | 9def4acb06bf9167441caa8af37e27b3cdbf8cf0 (diff) | |
| download | go-1e994e0a486afc976116e2d7a6ca7517fe150304.tar.xz | |
cmd/link: modify the register used in trampoline
R30 is the callee's saved register; using it requires saving and then restoring.
Therefore, we replace it with a register saved by the caller.
R4~R19 are argument registers on loong64, and R20 is the only remaining usable
caller saved register. To use R20 in trampoline, we modified the registers used
by the LoweredMove/LoweredMoveLoop operations (originally using r20 and r21,
now changed to R23 and R24).
Change-Id: Ie7bba0caa30a764a45bcb47635c35c829036c5a2
Reviewed-on: https://go-review.googlesource.com/c/go/+/726140
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: abner chenc <chenguoqi@loongson.cn>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Diffstat (limited to 'src/cmd/internal')
| -rw-r--r-- | src/cmd/internal/obj/loong64/doc.go | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/cmd/internal/obj/loong64/doc.go b/src/cmd/internal/obj/loong64/doc.go index 19c9e05590..1cf83223f1 100644 --- a/src/cmd/internal/obj/loong64/doc.go +++ b/src/cmd/internal/obj/loong64/doc.go @@ -6,6 +6,18 @@ Package loong64 implements an LoongArch64 assembler. Go assembly syntax is different from GNU LoongArch64 syntax, but we can still follow the general rules to map between them. +# Register Convention + + Name | Alias | Meaning + ----------------------------------------------------------------------------------------------------------------------- + R0 | REGZERO | Constant zero + R1 | REGLINK | Return address + R3 | REGSP | Stack pointer + R12,R13,R14,R15,R20 | | For plt and trampoline, use with caution in assembly code, save before calling function + R22 | REGG | Goroutine pointer + R29 | REGCTXT | Context for closures + R30 | REGTMP | Tmp register used by assembler + # Instructions mnemonics mapping rules 1. Bit widths represented by various instruction suffixes and prefixes |