fix(asm): make arm64 and loong64 relocations match the toolchain

asm/goobjarm64.go

@@ -13,28 +13,33 @@ import (
 )
 
 // GOObjectAARCH64 emits a GOOBJ object file for AArch64.  The layout is
-// the shared one in goobj.go — the toolchain preamble, the go120ld header
+// the shared one in goobj.go, the toolchain preamble, the go120ld header
 // with its block offsets, the string table, the symbol definitions and the
-// reloc/aux/data index arrays — with the arm64 preamble, the MinLC of 4
-// for the pc-value deltas, and R_ADDRARM64 relocation types for the
-// ADRP+ADD/LDR/STR address pairs.
+// reloc/aux/data index arrays, with the arm64 preamble, the MinLC of 4
+// for the pc-value deltas, and the arm64 relocation types for the ADRP
+// pairs and BL calls.
 func (img *Image) GOObjectAARCH64(pkgPath, srcPath string) ([]byte, error) {
 	pre, err := toolchainObjectPreambleAARCH64()
 	if err != nil {
 		return nil, err
 	}
 	return img.emitGOObject(pkgPath, srcPath, pre, 4, func(r Reloc) (uint16, uint8) {
-		if r.Kind == RelArm64Branch {
+		switch r.Kind {
+		case RelArm64Branch:
 			return relocArm64Branch, 4
+		case RelArm64LDST64:
+			return relocArm64LDST64, 4
+		default:
+			return relocArm64Addr, 4
 		}
-		return relocArm64Addr, 4
 	})
 }
 
 // arm64 relocation types (cmd/internal/objabi).
 const (
-	relocArm64Addr   = 3 // R_ADDRARM64 — ADRP+ADD/LDR/STR pair
-	relocArm64Branch = 9 // R_CALLARM64 — BL instruction
+	relocArm64Addr   = 3  // R_ADDRARM64, ADRP+ADD pair
+	relocArm64Branch = 9  // R_CALLARM64, BL instruction
+	relocArm64LDST64 = 40 // R_ARM64_PCREL_LDST64, ADRP+LDR/STR pair
 )
 
 // toolchainObjectPreambleAARCH64 returns the "go object ...\n!\n" header