Add cross tests for RISCV32

Signed-off-by: willieyz <willie.zhao@chelpis.com>

Author: willieyz

.github/actions/multi-functest/action.yml

@@ -28,7 +28,7 @@ inputs:
     description: LDFLAGS to pass to linking
     default: ""
   compile_mode:
-    description: all | native | cross-x86_64 | cross-aarch64 | cross-riscv64
+    description: all | native | cross-x86_64 | cross-aarch64 | cross-riscv64 | cross-riscv32
     default: "native"
   opt:
     description: all | opt | no_opt
@@ -229,3 +229,24 @@ runs:
           examples: ${{ inputs.examples }}
           stack: ${{ inputs.stack }}
           extra_args: ${{ inputs.extra_args }}
+      - name: Cross riscv32 Tests
+        if: ${{ (inputs.compile_mode == 'all' || inputs.compile_mode == 'cross-riscv32') && (success() || failure()) }}
+        uses: ./.github/actions/functest
+        with:
+          nix-shell: ${{ inputs.nix-shell }}
+          nix-cache: ${{ inputs.nix-cache }}
+          nix-verbose: ${{ inputs.nix-verbose }}
+          gh_token: ${{ inputs.gh_token }}
+          custom_shell: ${{ inputs.custom_shell }}
+          cflags: "${{ inputs.cflags }} -DMLD_FORCE_RISCV32"
+          ldflags: ${{ inputs.ldflags }}
+          cross_prefix: riscv32-unknown-linux-gnu-
+          exec_wrapper: qemu-riscv32
+          opt: ${{ inputs.opt }}
+          func: ${{ inputs.func }}
+          kat: ${{ inputs.kat }}
+          acvp: ${{ inputs.acvp }}
+          examples: ${{ inputs.examples }}
+          stack: ${{ inputs.stack }}
+          extra_args: ${{ inputs.extra_args }}
+

mldsa/mldsa_native.c

@@ -421,6 +421,7 @@
 #undef MLD_SYS_H
 #undef MLD_SYS_LITTLE_ENDIAN
 #undef MLD_SYS_PPC64LE
+#undef MLD_SYS_RISCV32
 #undef MLD_SYS_RISCV64
 #undef MLD_SYS_WINDOWS
 #undef MLD_SYS_X86_64

mldsa/src/sys.h

@@ -50,6 +50,10 @@
 #define MLD_SYS_RISCV64
 #endif
 
+#if defined(__riscv) && defined(__riscv_xlen) && __riscv_xlen == 32
+#define MLD_SYS_RISCV32
+#endif
+
 #if defined(_WIN64) || defined(_WIN32)
 #define MLD_SYS_WINDOWS
 #endif
@@ -80,6 +84,10 @@
 #error "MLD_FORCE_RISCV64 is set, but we don't seem to be on a RISCV64 system."
 #endif
 
+#if defined(MLD_FORCE_RISCV32) && !defined(MLD_SYS_RISCV32)
+#error "MLD_FORCE_RISCV32 is set, but we don't seem to be on a RISCV32 system."
+#endif
+
 /*
  * C90 does not have the inline compiler directive yet.
  * We don't use it in C90 builds.