!180 Enable go plugin support for riscv64

From: @misaka00251 
Reviewed-by: @hcnbxx, @jing-rui 
Signed-off-by: @jing-rui

0001-Enable-go-plugin-support-for-riscv64.patch

@@ -0,0 +1,40 @@
+From 019ec52ee5e7dec0c3a7937025948a742822a052 Mon Sep 17 00:00:00 2001
+From: misaka00251 <liuxin@iscas.ac.cn>
+Date: Mon, 27 Mar 2023 10:27:38 +0800
+Subject: [PATCH] Enable go plugin support for riscv64 (based on work by
+ yangjinghua)
+
+---
+ src/cmd/internal/sys/supported.go  | 2 +-
+ src/cmd/link/internal/ld/config.go | 2 +-
+ 2 files changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/src/cmd/internal/sys/supported.go b/src/cmd/internal/sys/supported.go
+index 1d74f6b..4fa8ed6 100644
+--- a/src/cmd/internal/sys/supported.go
++++ b/src/cmd/internal/sys/supported.go
+@@ -142,7 +142,7 @@ func BuildModeSupported(compiler, buildmode, goos, goarch string) bool {
+ 
+ 	case "plugin":
+ 		switch platform {
+-		case "linux/amd64", "linux/arm", "linux/arm64", "linux/386", "linux/s390x", "linux/ppc64le",
++		case "linux/amd64", "linux/arm", "linux/arm64", "linux/riscv64", "linux/386", "linux/s390x", "linux/ppc64le",
+ 			"android/amd64", "android/arm", "android/arm64", "android/386",
+ 			"darwin/amd64", "darwin/arm64",
+ 			"freebsd/amd64":
+diff --git a/src/cmd/link/internal/ld/config.go b/src/cmd/link/internal/ld/config.go
+index 4dd43a1..af5d8c5 100644
+--- a/src/cmd/link/internal/ld/config.go
++++ b/src/cmd/link/internal/ld/config.go
+@@ -95,7 +95,7 @@ func (mode *BuildMode) Set(s string) error {
+ 		switch buildcfg.GOOS {
+ 		case "linux":
+ 			switch buildcfg.GOARCH {
+-			case "386", "amd64", "arm", "arm64", "s390x", "ppc64le":
++			case "386", "amd64", "arm", "arm64", "riscv64", "s390x", "ppc64le":
+ 			default:
+ 				return badmode()
+ 			}
+-- 
+2.37.1 (Apple Git-137.1)
+

0002-runtime-support-riscv64-SV57-mode.patch

@@ -0,0 +1,61 @@
+From 1e3c19f3fee12e5e2b7802a54908a4d4d03960da Mon Sep 17 00:00:00 2001
+From: Dmitry Vyukov <dvyukov@google.com>
+Date: Fri, 27 May 2022 18:55:35 +0200
+Subject: [PATCH] runtime: support riscv64 SV57 mode
+
+riscv64 has SV57 mode when user-space VA is 56 bits.
+Linux kernel recently got support for this mode and Go binaries started crashing as:
+
+runtime: lfstack.push invalid packing: node=0xffffff5908a940 cnt=0x1
+packed=0xffff5908a9400001 -> node=0xffff5908a940
+
+Adjust lfstack code to use only 8 top bits of pointers on riscv64.
+
+For context see:
+https://groups.google.com/g/syzkaller-bugs/c/lU0GQTZoNQQ/m/O_c3vmE3AAAJ
+
+Update #54104
+
+Change-Id: Ib5d3d6a79c0c6eddf11618d73fcc8bc1832a9c25
+Reviewed-on: https://go-review.googlesource.com/c/go/+/409055
+Reviewed-by: Joel Sing <joel@sing.id.au>
+Reviewed-by: Meng Zhuo <mzh@golangcn.org>
+Reviewed-by: Michael Knyszek <mknyszek@google.com>
+Reviewed-by: Cherry Mui <cherryyz@google.com>
+---
+
+diff --git a/src/runtime/lfstack_64bit.go b/src/runtime/lfstack_64bit.go
+index 154130c..88cbd3b 100644
+--- a/src/runtime/lfstack_64bit.go
++++ b/src/runtime/lfstack_64bit.go
+@@ -36,12 +36,21 @@
+ 	// We use one bit to distinguish between the two ranges.
+ 	aixAddrBits = 57
+ 	aixCntBits  = 64 - aixAddrBits + 3
++
++	// riscv64 SV57 mode gives 56 bits of userspace VA.
++	// lfstack code supports it, but broader support for SV57 mode is incomplete,
++	// and there may be other issues (see #54104).
++	riscv64AddrBits = 56
++	riscv64CntBits  = 64 - riscv64AddrBits + 3
+ )
+ 
+ func lfstackPack(node *lfnode, cnt uintptr) uint64 {
+ 	if GOARCH == "ppc64" && GOOS == "aix" {
+ 		return uint64(uintptr(unsafe.Pointer(node)))<<(64-aixAddrBits) | uint64(cnt&(1<<aixCntBits-1))
+ 	}
++	if GOARCH == "riscv64" {
++		return uint64(uintptr(unsafe.Pointer(node)))<<(64-riscv64AddrBits) | uint64(cnt&(1<<riscv64CntBits-1))
++	}
+ 	return uint64(uintptr(unsafe.Pointer(node)))<<(64-addrBits) | uint64(cnt&(1<<cntBits-1))
+ }
+ 
+@@ -54,5 +63,8 @@
+ 	if GOARCH == "ppc64" && GOOS == "aix" {
+ 		return (*lfnode)(unsafe.Pointer(uintptr((val >> aixCntBits << 3) | 0xa<<56)))
+ 	}
++	if GOARCH == "riscv64" {
++		return (*lfnode)(unsafe.Pointer(uintptr(val >> riscv64CntBits << 3)))
++	}
+ 	return (*lfnode)(unsafe.Pointer(uintptr(val >> cntBits << 3)))
+ }

golang.spec

@@ -62,11 +62,13 @@
 
 Name:           golang
 Version:        1.19.4
-Release:        1
+Release:        2
 Summary:        The Go Programming Language
 License:        BSD and Public Domain
 URL:            https://golang.org/
 Source0:        https://dl.google.com/go/go1.19.4.src.tar.gz
+Patch0:         0001-Enable-go-plugin-support-for-riscv64.patch
+Patch1:         0002-runtime-support-riscv64-SV57-mode.patch
 
 %if !%{golang_bootstrap}
 BuildRequires:  gcc-go >= 5
@@ -387,6 +389,9 @@ fi
 %files devel -f go-tests.list -f go-misc.list -f go-src.list
 
 %changelog
+* Mon Apr 03 2023 misaka00251 <liuxin@iscas.ac.cn> - 1.19.4-2
+- Enable go plugin support for riscv64 (based on work by yangjinghua)
+- Backport upstream sv57 enablement for riscv64
 
 * Tue Jan 10 2023 hanchao <hanchao47@huawei.com> - 1.19.4-1
 - upgrade to 1.19.4