From b4ac4b4b42bd2b8014cba57991d43f09eb6292f6 Mon Sep 17 00:00:00 2001
From: WANG Xuerui <git@xen0n.name>
Date: Sat, 3 Dec 2022 20:57:52 +0800
Subject: [PATCH] cmd/internal/obj/loong64: add the PCALAU12I instruction for
 reloc use

The LoongArch ELF psABI v2.00 revamped the relocation design, largely
moving to using the `pcalau12i + addi/ld/st` pair for PC-relative
addressing within +/- 32 bits. The "pcala" in `pcalau12i` stands for
"PC-aligned add"; the instruction's semantics happen to coincide with
arm64's `adrp`.

Add support for emitting this instruction as part of the relevant
addressing ops, for use with new reloc types later.

Updates #58784

Change-Id: Ic1747cd9745aad0d1abb9bd78400cd5ff5978bc8
Reviewed-on: https://go-review.googlesource.com/c/go/+/455016
Reviewed-by: abner chenc <chenguoqi@loongson.cn>
Auto-Submit: Wayne Zuo <wdvxdr@golangcn.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Wayne Zuo <wdvxdr@golangcn.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Wayne Zuo <wdvxdr@golangcn.org>
Reviewed-by: xiaodong liu <teaofmoli@gmail.com>
Reviewed-by: Meidan Li <limeidan@loongson.cn>
TryBot-Result: Gopher Robot <gobot@golang.org>
---
 src/cmd/internal/obj/loong64/a.out.go  | 1 +
 src/cmd/internal/obj/loong64/anames.go | 1 +
 src/cmd/internal/obj/loong64/asm.go    | 2 ++
 3 files changed, 4 insertions(+)

diff --git a/src/cmd/internal/obj/loong64/a.out.go b/src/cmd/internal/obj/loong64/a.out.go
index 10cf396669..e7ac592b8b 100644
--- a/src/cmd/internal/obj/loong64/a.out.go
+++ b/src/cmd/internal/obj/loong64/a.out.go
@@ -265,6 +265,7 @@ const (
 	ALU12IW
 	ALU32ID
 	ALU52ID
+	APCALAU12I
 	APCADDU12I
 	AJIRL
 	ABGE
diff --git a/src/cmd/internal/obj/loong64/anames.go b/src/cmd/internal/obj/loong64/anames.go
index eb13da20c3..f61756e7a8 100644
--- a/src/cmd/internal/obj/loong64/anames.go
+++ b/src/cmd/internal/obj/loong64/anames.go
@@ -33,6 +33,7 @@ var Anames = []string{
 	"LU12IW",
 	"LU32ID",
 	"LU52ID",
+	"PCALAU12I",
 	"PCADDU12I",
 	"JIRL",
 	"BGE",
diff --git a/src/cmd/internal/obj/loong64/asm.go b/src/cmd/internal/obj/loong64/asm.go
index 02e44ee0a1..f4311c4c07 100644
--- a/src/cmd/internal/obj/loong64/asm.go
+++ b/src/cmd/internal/obj/loong64/asm.go
@@ -1847,6 +1847,8 @@ func (c *ctxt0) opir(a obj.As) uint32 {
 		return 0x0a << 25
 	case ALU32ID:
 		return 0x0b << 25
+	case APCALAU12I:
+		return 0x0d << 25
 	case APCADDU12I:
 		return 0x0e << 25
 	}
-- 
2.50.0