NurOS-Linux · meigoc · Jul 18, 2026 · Jul 18, 2026 · Jul 18, 2026
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
@@ -85,6 +85,36 @@ jobs:
       - name: Test
         run: meson test -C build-san --print-errorlogs
 
+  arch-asm:
+    name: Assembly (32-bit arch validation)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install clang + lld
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y clang lld
+
+      - name: Assemble and PIC-link each 32-bit arch backend
+        run: |
+          set -e
+          assemble() {
+            dir="$1"; shift
+            for a in crc32 md5 sha256; do
+              clang "$@" -fPIC -c "arch/$dir/$a.S" -o "/tmp/${dir}_$a.o"
+            done
+            clang "$@" -shared -fPIC -fuse-ld=lld -Wl,-z,text -nostdlib \
+              "/tmp/${dir}_crc32.o" "/tmp/${dir}_md5.o" "/tmp/${dir}_sha256.o" \
+              -o "/tmp/${dir}.so"
+            echo "OK: $dir"
+          }
+          assemble arm     -target arm-linux-gnueabihf -march=armv7-a
+          assemble x86     -target i386-linux-gnu
+          assemble riscv32 -target riscv32-linux-gnu -march=rv32gc -mabi=ilp32
+          assemble mips    -target mipsel-linux-gnu -march=mips32r2
+          assemble powerpc -target powerpc-linux-gnu
+
   cross-aarch64:
     name: Cross-compile (aarch64)
     runs-on: ubuntu-latest
@@ -284,6 +314,58 @@ jobs:
             --buildtype=release
           meson compile -C build-mips64el
 
+  cross-armhf:
+    name: Cross-compile (armhf)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Add armhf architecture
+        run: |
+          sudo dpkg --add-architecture armhf
+          sudo sed -i '/^deb \[/!s/^deb /deb [arch=amd64] /' /etc/apt/sources.list
+          sudo find /etc/apt/sources.list.d/ -name '*.list' \
+            -exec sed -i '/^deb \[/!s/^deb /deb [arch=amd64] /' {} +
+          sudo find /etc/apt/sources.list.d/ -name '*.sources' \
+            -exec sed -i '/^Architectures:/d; /^Types:/i Architectures: amd64' {} +
+          . /etc/os-release
+          sudo tee /etc/apt/sources.list.d/armhf-ports.list << EOF
+          deb [arch=armhf] http://ports.ubuntu.com/ubuntu-ports ${VERSION_CODENAME} main restricted universe
+          deb [arch=armhf] http://ports.ubuntu.com/ubuntu-ports ${VERSION_CODENAME}-updates main restricted universe
+          deb [arch=armhf] http://ports.ubuntu.com/ubuntu-ports ${VERSION_CODENAME}-security main restricted universe
+          EOF
+          sudo apt-get update
+
+      - name: Install dependencies
+        run: |
+          sudo apt-get install -y \
+            clang lld llvm \
+            gcc-arm-linux-gnueabihf \
+            meson ninja-build pkg-config \
+            libarchive-dev:armhf \
+            liblmdb-dev:armhf \
+            libsodium-dev:armhf \
+            libseccomp-dev:armhf
+
+      - name: Build yyjson for armhf
+        run: |
+          git clone --depth=1 https://github.com/ibireme/yyjson.git /tmp/yyjson
+          clang --target=arm-linux-gnueabihf -O2 -shared -fPIC \
+            -o /tmp/libyyjson.so /tmp/yyjson/src/yyjson.c
+          sudo cp /tmp/libyyjson.so /usr/lib/arm-linux-gnueabihf/
+          sudo cp /tmp/yyjson/src/yyjson.h /usr/include/
+          printf 'Name: yyjson\nDescription: Fast JSON library\nVersion: 0.0.0\nLibs: -L/usr/lib/arm-linux-gnueabihf -lyyjson\nCflags: -I/usr/include\n' | \
+            sudo tee /usr/lib/arm-linux-gnueabihf/pkgconfig/yyjson.pc
+
+      - name: Cross-compile
+        env:
+          PKG_CONFIG_LIBDIR: /usr/lib/arm-linux-gnueabihf/pkgconfig:/usr/share/pkgconfig
+        run: |
+          meson setup build-armhf \
+            --cross-file cross-arm.txt \
+            --buildtype=release
+          meson compile -C build-armhf
+
   freebsd:
     name: Build (FreeBSD x86_64)
     runs-on: ubuntu-latest

diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -6,6 +6,19 @@ All notable changes to this project will be documented in this file.
 
 ### Added
 
+- 32-bit assembly backends for the checksum module (CRC-32, MD5, SHA-256) on
+  ARM (AArch32/ARMv7), x86 (i386/IA-32), RISC-V (RV32), MIPS32 and PowerPC,
+  extending the existing 64-bit backends to 32-bit targets; each replaces the
+  portable C fallback with a hand-written scalar transform selected at build
+  time via `host_machine.cpu_family()`. The message-scheduling code assembles
+  words byte-wise, so the backends are endian-independent (validated on both
+  little- and big-endian MIPS and on big-endian PowerPC), and symbol
+  addressing is position-independent so they link cleanly into the shared
+  library
+- Cross-compilation files (`cross-arm.txt`, `cross-i386.txt`,
+  `cross-riscv32.txt`, `cross-mips.txt`, `cross-powerpc.txt`) and CI coverage:
+  an `arch-asm` job that assembles and PIC-links every 32-bit backend, plus a
+  full `armhf` cross-compile job
 - FreeBSD support: the library builds, links, and passes its test suite on
   FreeBSD with the libsodium signing backend; no source changes are required
   because the seccomp dependency is optional and the install-script runner

diff --git a/arch/arm/crc32.S b/arch/arm/crc32.S
@@ -0,0 +1,136 @@
+/* SPDX-License-Identifier: GPL-3.0-only */
+/* SPDX-FileCopyrightText: 2026 Meigo™ Corporation (https://github.com/meigoc) */
+
+    .text
+    .syntax unified
+    .arm
+
+    .globl  apg_crc32_hw_supported
+    .type   apg_crc32_hw_supported, %function
+apg_crc32_hw_supported:
+    mov     r0, #1
+    bx      lr
+    .size   apg_crc32_hw_supported, .-apg_crc32_hw_supported
+
+    .globl  apg_crc32_update_hw
+    .type   apg_crc32_update_hw, %function
+apg_crc32_update_hw:
+    push    {r4, lr}
+    movw    r3, #:lower16:(.Ltab - (0f + 8))
+    movt    r3, #:upper16:(.Ltab - (0f + 8))
+0:  add     r3, pc, r3
+.Lc4:
+    cmp     r2, #4
+    blo     .Lctail
+    ldrb    r4, [r1, #0]
+    eor     r4, r4, r0
+    and     r4, r4, #0xff
+    ldr     r4, [r3, r4, lsl #2]
+    lsr     r0, r0, #8
+    eor     r0, r0, r4
+    ldrb    r4, [r1, #1]
+    eor     r4, r4, r0
+    and     r4, r4, #0xff
+    ldr     r4, [r3, r4, lsl #2]
+    lsr     r0, r0, #8
+    eor     r0, r0, r4
+    ldrb    r4, [r1, #2]
+    eor     r4, r4, r0
+    and     r4, r4, #0xff
+    ldr     r4, [r3, r4, lsl #2]
+    lsr     r0, r0, #8
+    eor     r0, r0, r4
+    ldrb    r4, [r1, #3]
+    eor     r4, r4, r0
+    and     r4, r4, #0xff
+    ldr     r4, [r3, r4, lsl #2]
+    lsr     r0, r0, #8
+    eor     r0, r0, r4
+    add     r1, r1, #4
+    sub     r2, r2, #4
+    b       .Lc4
+.Lctail:
+    cmp     r2, #0
+    beq     .Lcdone
+    ldrb    r4, [r1], #1
+    eor     r4, r4, r0
+    and     r4, r4, #0xff
+    ldr     r4, [r3, r4, lsl #2]
+    lsr     r0, r0, #8
+    eor     r0, r0, r4
+    sub     r2, r2, #1
+    b       .Lctail
+.Lcdone:
+    pop     {r4, lr}
+    bx      lr
+    .size   apg_crc32_update_hw, .-apg_crc32_update_hw
+
+    .section .rodata
+    .align  4
+.Ltab:
+    .long 0x00000000,0x77073096,0xee0e612c,0x990951ba
+    .long 0x076dc419,0x706af48f,0xe963a535,0x9e6495a3
+    .long 0x0edb8832,0x79dcb8a4,0xe0d5e91e,0x97d2d988
+    .long 0x09b64c2b,0x7eb17cbd,0xe7b82d07,0x90bf1d91
+    .long 0x1db71064,0x6ab020f2,0xf3b97148,0x84be41de
+    .long 0x1adad47d,0x6ddde4eb,0xf4d4b551,0x83d385c7
+    .long 0x136c9856,0x646ba8c0,0xfd62f97a,0x8a65c9ec
+    .long 0x14015c4f,0x63066cd9,0xfa0f3d63,0x8d080df5
+    .long 0x3b6e20c8,0x4c69105e,0xd56041e4,0xa2677172
+    .long 0x3c03e4d1,0x4b04d447,0xd20d85fd,0xa50ab56b
+    .long 0x35b5a8fa,0x42b2986c,0xdbbbc9d6,0xacbcf940
+    .long 0x32d86ce3,0x45df5c75,0xdcd60dcf,0xabd13d59
+    .long 0x26d930ac,0x51de003a,0xc8d75180,0xbfd06116
+    .long 0x21b4f4b5,0x56b3c423,0xcfba9599,0xb8bda50f
+    .long 0x2802b89e,0x5f058808,0xc60cd9b2,0xb10be924
+    .long 0x2f6f7c87,0x58684c11,0xc1611dab,0xb6662d3d
+    .long 0x76dc4190,0x01db7106,0x98d220bc,0xefd5102a
+    .long 0x71b18589,0x06b6b51f,0x9fbfe4a5,0xe8b8d433
+    .long 0x7807c9a2,0x0f00f934,0x9609a88e,0xe10e9818
+    .long 0x7f6a0dbb,0x086d3d2d,0x91646c97,0xe6635c01
+    .long 0x6b6b51f4,0x1c6c6162,0x856530d8,0xf262004e
+    .long 0x6c0695ed,0x1b01a57b,0x8208f4c1,0xf50fc457
+    .long 0x65b0d9c6,0x12b7e950,0x8bbeb8ea,0xfcb9887c
+    .long 0x62dd1ddf,0x15da2d49,0x8cd37cf3,0xfbd44c65
+    .long 0x4db26158,0x3ab551ce,0xa3bc0074,0xd4bb30e2
+    .long 0x4adfa541,0x3dd895d7,0xa4d1c46d,0xd3d6f4fb
+    .long 0x4369e96a,0x346ed9fc,0xad678846,0xda60b8d0
+    .long 0x44042d73,0x33031de5,0xaa0a4c5f,0xdd0d7cc9
+    .long 0x5005713c,0x270241aa,0xbe0b1010,0xc90c2086
+    .long 0x5768b525,0x206f85b3,0xb966d409,0xce61e49f
+    .long 0x5edef90e,0x29d9c998,0xb0d09822,0xc7d7a8b4
+    .long 0x59b33d17,0x2eb40d81,0xb7bd5c3b,0xc0ba6cad
+    .long 0xedb88320,0x9abfb3b6,0x03b6e20c,0x74b1d29a
+    .long 0xead54739,0x9dd277af,0x04db2615,0x73dc1683
+    .long 0xe3630b12,0x94643b84,0x0d6d6a3e,0x7a6a5aa8
+    .long 0xe40ecf0b,0x9309ff9d,0x0a00ae27,0x7d079eb1
+    .long 0xf00f9344,0x8708a3d2,0x1e01f268,0x6906c2fe
+    .long 0xf762575d,0x806567cb,0x196c3671,0x6e6b06e7
+    .long 0xfed41b76,0x89d32be0,0x10da7a5a,0x67dd4acc
+    .long 0xf9b9df6f,0x8ebeeff9,0x17b7be43,0x60b08ed5
+    .long 0xd6d6a3e8,0xa1d1937e,0x38d8c2c4,0x4fdff252
+    .long 0xd1bb67f1,0xa6bc5767,0x3fb506dd,0x48b2364b
+    .long 0xd80d2bda,0xaf0a1b4c,0x36034af6,0x41047a60
+    .long 0xdf60efc3,0xa867df55,0x316e8eef,0x4669be79
+    .long 0xcb61b38c,0xbc66831a,0x256fd2a0,0x5268e236
+    .long 0xcc0c7795,0xbb0b4703,0x220216b9,0x5505262f
+    .long 0xc5ba3bbe,0xb2bd0b28,0x2bb45a92,0x5cb36a04
+    .long 0xc2d7ffa7,0xb5d0cf31,0x2cd99e8b,0x5bdeae1d
+    .long 0x9b64c2b0,0xec63f226,0x756aa39c,0x026d930a
+    .long 0x9c0906a9,0xeb0e363f,0x72076785,0x05005713
+    .long 0x95bf4a82,0xe2b87a14,0x7bb12bae,0x0cb61b38
+    .long 0x92d28e9b,0xe5d5be0d,0x7cdcefb7,0x0bdbdf21
+    .long 0x86d3d2d4,0xf1d4e242,0x68ddb3f8,0x1fda836e
+    .long 0x81be16cd,0xf6b9265b,0x6fb077e1,0x18b74777
+    .long 0x88085ae6,0xff0f6a70,0x66063bca,0x11010b5c
+    .long 0x8f659eff,0xf862ae69,0x616bffd3,0x166ccf45
+    .long 0xa00ae278,0xd70dd2ee,0x4e048354,0x3903b3c2
+    .long 0xa7672661,0xd06016f7,0x4969474d,0x3e6e77db
+    .long 0xaed16a4a,0xd9d65adc,0x40df0b66,0x37d83bf0
+    .long 0xa9bcae53,0xdebb9ec5,0x47b2cf7f,0x30b5ffe9
+    .long 0xbdbdf21c,0xcabac28a,0x53b39330,0x24b4a3a6
+    .long 0xbad03605,0xcdd70693,0x54de5729,0x23d967bf
+    .long 0xb3667a2e,0xc4614ab8,0x5d681b02,0x2a6f2b94
+    .long 0xb40bbe37,0xc30c8ea1,0x5a05df1b,0x2d02ef8d
+
+    .section .note.GNU-stack,"",%progbits