Enable supported MIPS32 assembly in CI

Use the little endian MIPS32 toolchain since the generated assembly is
little-endian, and define the architecture feature macros needed to
select the AES, BN, SHA-1, and SHA-256 assembly implementations.

Do not generate or build SHA-512 assembly for MIPS32. The generator
accepts the O32 ABI, but the resulting implementation still uses 64-bit
instructions and requires the MIPS64 ISA. It is therefore not valid for
generic MIPS32 targets.

7 files changed, 44 insertions, 8 deletions

diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
index a2a85e7..06dda17 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -68,7 +68,7 @@ jobs:
               packages+=(qemu-user-static binfmt-support g++-14-loongarch64-linux-gnu)
               ;;
             mips32)
-              packages+=(qemu-user-static binfmt-support g++-mips-linux-gnu)
+              packages+=(qemu-user-static binfmt-support g++-mipsel-linux-gnu)
               ;;
             mips64)
               packages+=(qemu-user-static binfmt-support g++-mips64el-linux-gnuabi64)
diff --git a/configure.ac b/configure.ac
index 12703dd..7c6ac98 100644
--- a/configure.ac
+++ b/configure.ac
@@ -95,7 +95,7 @@ AS_CASE([$host_cpu],
         [*amd64*], [host_cpu=x86_64 HOSTARCH=intel],
         [i?86], [host_cpu=i386 HOSTARCH=intel enable_asm=no],
         [mips64*], [host_cpu=mips64 enable_asm=${enable_asm-no}],
-        [mips*], [host_cpu=mips enable_asm=no],
+        [mips*], [host_cpu=mips enable_asm=${enable_asm-no}],
         [powerpc*], [host_cpu=powerpc],
         [ppc64*], [host_cpu=powerpc64],
         [x86_64], [HOSTARCH=intel]
diff --git a/crypto/Makefile.am.elf-mips b/crypto/Makefile.am.elf-mips
index 2276991..682fb5e 100644
--- a/crypto/Makefile.am.elf-mips
+++ b/crypto/Makefile.am.elf-mips
@@ -2,7 +2,6 @@ ASM_MIPS_ELF = aes/aes-mips.S
 ASM_MIPS_ELF += bn/bn-mips.S
 ASM_MIPS_ELF += bn/mont-mips.S
 ASM_MIPS_ELF += sha/sha1-mips.S
-ASM_MIPS_ELF += sha/sha512-mips.S
 ASM_MIPS_ELF += sha/sha256-mips.S
 
 EXTRA_DIST += $(ASM_MIPS_ELF)
diff --git a/crypto/arch/mips/crypto_arch.h b/crypto/arch/mips/crypto_arch.h
index 274879c..2407503 100644
--- a/crypto/arch/mips/crypto_arch.h
+++ b/crypto/arch/mips/crypto_arch.h
@@ -18,4 +18,22 @@
 #ifndef HEADER_CRYPTO_ARCH_H
 #define HEADER_CRYPTO_ARCH_H
 
+#ifndef OPENSSL_NO_ASM
+
+#ifdef LIBRESSL_USE_AES_ASSEMBLY
+#define HAVE_AES_SET_ENCRYPT_KEY_INTERNAL
+#define HAVE_AES_SET_DECRYPT_KEY_INTERNAL
+#define HAVE_AES_ENCRYPT_INTERNAL
+#define HAVE_AES_DECRYPT_INTERNAL
+#endif
+
+#ifdef LIBRESSL_USE_SHA_ASSEMBLY
+#define HAVE_SHA1_BLOCK_DATA_ORDER
+#define HAVE_SHA1_BLOCK_GENERIC
+#define HAVE_SHA256_BLOCK_DATA_ORDER
+#define HAVE_SHA256_BLOCK_GENERIC
+#endif
+
+#endif
+
 #endif
diff --git a/crypto/bn/arch/mips/bn_arch.h b/crypto/bn/arch/mips/bn_arch.h
index 4d6571f..a14b83b 100644
--- a/crypto/bn/arch/mips/bn_arch.h
+++ b/crypto/bn/arch/mips/bn_arch.h
@@ -20,5 +20,24 @@
 
 #ifndef OPENSSL_NO_ASM
 
+#ifdef LIBRESSL_USE_BN_ASSEMBLY
+
+#define HAVE_BN_ADD_WORDS
+
+#define HAVE_BN_DIV_WORDS
+#define HAVE_BN_DIV_3_WORDS
+
+#define HAVE_BN_MUL_COMBA4
+#define HAVE_BN_MUL_COMBA8
+#define HAVE_BN_MULW_ADD_WORDS
+#define HAVE_BN_MULW_WORDS
+
+#define HAVE_BN_SQR_COMBA4
+#define HAVE_BN_SQR_COMBA8
+
+#define HAVE_BN_SUB_WORDS
+
+#endif
+
 #endif
 #endif
diff --git a/scripts/test b/scripts/test
index 6d573e3..b3386a8 100755
--- a/scripts/test
+++ b/scripts/test
@@ -173,11 +173,12 @@ elif [ "$ARCH" = "riscv64" ]; then
 
 elif [ "$ARCH" = "mips32" ] || [ "$ARCH" = "mips64" ]; then
         if [ "$ARCH" = "mips32" ]; then
-                sudo ln -sf /usr/mips-linux-gnu/lib/ld.so.1 /lib/
-                setup_cross_compiler mips-linux-gnu
+                sudo ln -sf /usr/mipsel-linux-gnu/lib/ld.so.1 /lib/
+                setup_cross_compiler mipsel-linux-gnu
 
-                ./configure --host=mips-linux-gnu
-                LD_LIBRARY_PATH=/usr/mips-linux-gnu/lib make -j 4 check
+                # MIPS32 assembly is disabled by default, so enable it for CI coverage.
+                ./configure --host=mipsel-linux-gnu --enable-asm
+                LD_LIBRARY_PATH=/usr/mipsel-linux-gnu/lib make -j 4 check
         else
                 sudo ln -sf /usr/mips64el-linux-gnuabi64/lib64/ld.so.1 /lib64
                 setup_cross_compiler mips64el-linux-gnuabi64
diff --git a/update.sh b/update.sh
index ddd2cf3..4b2c4dd 100755
--- a/update.sh
+++ b/update.sh
@@ -248,7 +248,6 @@ gen_asm_mips o32 bn  mips        bn-mips
 gen_asm_mips o32 bn  mips-mont   mont-mips
 gen_asm_mips o32 sha sha1-mips   sha1-mips
 gen_asm_mips o32 sha sha512-mips sha256-mips
-gen_asm_mips o32 sha sha512-mips sha512-mips
 
 echo generating mips64 ASM source for elf
 gen_asm_mips 64 aes aes-mips    aes-mips64