From 187d9c6aca05f129cd71801488bb54a7aa4c3508 Mon Sep 17 00:00:00 2001
From: Ayke van Laethem <aykevanlaethem@gmail.com>
Date: Tue, 10 Jan 2023 20:55:29 +0100
Subject: [PATCH] riscv: use 16-byte alignment everywhere

Source: https://riscv.org/wp-content/uploads/2015/01/riscv-calling.pdf
---
 src/runtime/arch_tinygoriscv.go   | 6 ++++++
 src/runtime/arch_tinygoriscv32.go | 5 -----
 src/runtime/arch_tinygoriscv64.go | 5 -----
 3 files changed, 6 insertions(+), 10 deletions(-)

diff --git a/src/runtime/arch_tinygoriscv.go b/src/runtime/arch_tinygoriscv.go
index bec0821e..904ff5d4 100644
--- a/src/runtime/arch_tinygoriscv.go
+++ b/src/runtime/arch_tinygoriscv.go
@@ -6,6 +6,12 @@ import "device/riscv"
 
 const deferExtraRegs = 0
 
+// RISC-V has a maximum alignment of 16 bytes (both for RV32 and for RV64).
+// Source: https://riscv.org/wp-content/uploads/2015/01/riscv-calling.pdf
+func align(ptr uintptr) uintptr {
+	return (ptr + 15) &^ 15
+}
+
 func getCurrentStackPointer() uintptr {
 	return uintptr(stacksave())
 }
diff --git a/src/runtime/arch_tinygoriscv32.go b/src/runtime/arch_tinygoriscv32.go
index 538259f7..df076a76 100644
--- a/src/runtime/arch_tinygoriscv32.go
+++ b/src/runtime/arch_tinygoriscv32.go
@@ -6,8 +6,3 @@ const GOARCH = "arm" // riscv pretends to be arm
 
 // The bitness of the CPU (e.g. 8, 32, 64).
 const TargetBits = 32
-
-// Align on word boundary.
-func align(ptr uintptr) uintptr {
-	return (ptr + 3) &^ 3
-}
diff --git a/src/runtime/arch_tinygoriscv64.go b/src/runtime/arch_tinygoriscv64.go
index 23036f8d..be96e561 100644
--- a/src/runtime/arch_tinygoriscv64.go
+++ b/src/runtime/arch_tinygoriscv64.go
@@ -6,8 +6,3 @@ const GOARCH = "arm64" // riscv pretends to be arm
 
 // The bitness of the CPU (e.g. 8, 32, 64).
 const TargetBits = 64
-
-// Align on word boundary.
-func align(ptr uintptr) uintptr {
-	return (ptr + 7) &^ 7
-}