feat: Add basic support for LoongArch (#67)

boring-sys/build/main.rs

@@ -488,6 +488,9 @@ fn ensure_patches_applied(config: &Config) -> io::Result<()> {
         "boringssl-44b3df6f03d85c901767250329c571db405122d5.patch",
     )?;
 
+    println!("cargo:warning=applying loongarch patch to boringssl");
+    apply_patch(config, "boringssl-loongarch.patch")?;
+
     if config.features.underscore_wildcards {
         println!("cargo:warning=applying underscore wildcards patch to boringssl");
         apply_patch(config, "underscore-wildcards.patch")?;

boring-sys/patches/boringssl-loongarch.patch

@@ -0,0 +1,43 @@
+From d39506c373dc03b1bfab2c01abc2232e36d13ed6 Mon Sep 17 00:00:00 2001
+From: WANG Rui <wangrui@loongson.cn>
+Date: Sun, 27 Apr 2025 16:09:06 +0800
+Subject: [PATCH] Add basic support for LoongArch
+
+Signed-off-by: WANG Rui <wangrui@loongson.cn>
+---
+ src/crypto/fipsmodule/rand/getrandom_fillin.h | 2 ++
+ src/include/openssl/base.h                    | 5 +++++
+ 2 files changed, 7 insertions(+)
+
+diff --git a/src/crypto/fipsmodule/rand/getrandom_fillin.h b/src/crypto/fipsmodule/rand/getrandom_fillin.h
+index 0f290e963..669a9077c 100644
+--- a/src/crypto/fipsmodule/rand/getrandom_fillin.h
++++ b/src/crypto/fipsmodule/rand/getrandom_fillin.h
+@@ -30,6 +30,8 @@
+ #define EXPECTED_NR_getrandom 278
+ #elif defined(OPENSSL_ARM)
+ #define EXPECTED_NR_getrandom 384
++#elif defined(OPENSSL_LOONGARCH64)
++#define EXPECTED_NR_getrandom 278
+ #elif defined(OPENSSL_RISCV64)
+ #define EXPECTED_NR_getrandom 278
+ #endif
+diff --git a/src/include/openssl/base.h b/src/include/openssl/base.h
+index 67429c099..6ef32eeec 100644
+--- a/src/include/openssl/base.h
++++ b/src/include/openssl/base.h
+@@ -96,6 +96,11 @@ extern "C" {
+ #elif defined(__ARMEL__) || defined(_M_ARM)
+ #define OPENSSL_32_BIT
+ #define OPENSSL_ARM
++#elif defined(__loongarch__) && __SIZEOF_POINTER__ == 8
++#define OPENSSL_64_BIT
++#define OPENSSL_LOONGARCH64
++#elif defined(__loongarch__) && __SIZEOF_POINTER__ == 4
++#define OPENSSL_32_BIT
+ #elif defined(__MIPSEL__) && !defined(__LP64__)
+ #define OPENSSL_32_BIT
+ #define OPENSSL_MIPS
+-- 
+2.46.0
+