Add Android build and APK injection scripts

libs/build_deps.sh

@@ -0,0 +1,136 @@
+#!/bin/bash
+set -euo pipefail
+
+# Builds shadowhook as a static library for Android arm64.
+# Produces: libs/libshadowhook.a and libs/libshadowhook_nothing.so
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+PROJECT_DIR="$(dirname "$SCRIPT_DIR")"
+BUILD_DIR="$PROJECT_DIR/build/deps"
+mkdir -p "$BUILD_DIR"
+
+# --- Auto-detect Android NDK (same logic as build.sh) ---
+find_ndk() {
+    if [ -n "${ANDROID_NDK_HOME:-}" ] && [ -d "$ANDROID_NDK_HOME" ]; then
+        echo "$ANDROID_NDK_HOME"; return
+    fi
+    local brew_ndk
+    brew_ndk=$(find /opt/homebrew /usr/local -path "*/android-ndk/*/toolchains/llvm/prebuilt" -type d 2>/dev/null | head -1)
+    if [ -n "$brew_ndk" ]; then
+        echo "$(dirname "$(dirname "$(dirname "$brew_ndk")")")"; return
+    fi
+    local sdk_ndk
+    sdk_ndk=$(find "$HOME/Library/Android/sdk/ndk" -maxdepth 1 -type d 2>/dev/null | sort -V | tail -1)
+    if [ -n "$sdk_ndk" ] && [ -d "$sdk_ndk" ]; then
+        echo "$sdk_ndk"; return
+    fi
+    for p in /opt/android-ndk /usr/local/android-ndk "$HOME/android-ndk"; do
+        if [ -d "$p" ]; then echo "$p"; return; fi
+    done
+    echo ""
+}
+
+NDK_HOME="$(find_ndk)"
+API_LEVEL="${ANDROID_API_LEVEL:-21}"
+CC=""
+if [ -n "$NDK_HOME" ]; then
+    CC=$(find "$NDK_HOME/toolchains/llvm/prebuilt" -type f \
+        -name "aarch64-linux-android${API_LEVEL}-clang" -print -quit 2>/dev/null)
+fi
+if [ -z "$CC" ]; then
+    echo "ERROR: aarch64-linux-android clang not found."
+    echo "  Set ANDROID_NDK_HOME to your NDK path."
+    exit 1
+fi
+
+TOOLCHAIN_DIR="$(dirname "$CC")"
+AR="$TOOLCHAIN_DIR/llvm-ar"
+CFLAGS="-O2 -ffunction-sections -fdata-sections -fPIC -DANDROID -Wall -Wextra -Wno-unused-parameter -Wno-unused-function"
+
+OUT_DIR="$SCRIPT_DIR"
+
+echo "=== Building shadowhook (arm64-v8a) ==="
+
+SH="$SCRIPT_DIR/shadowhook/shadowhook/src/main/cpp"
+
+SH_SRCS="
+$SH/sh_elf.c
+$SH/sh_enter.c
+$SH/sh_hub.c
+$SH/sh_island.c
+$SH/sh_linker.c
+$SH/sh_recorder.c
+$SH/sh_safe.c
+$SH/sh_switch.c
+$SH/sh_task.c
+$SH/sh_xdl.c
+$SH/shadowhook.c
+$SH/arch/arm64/sh_a64.c
+$SH/arch/arm64/sh_inst.c
+$SH/arch/arm64/sh_glue.S
+$SH/common/bytesig.c
+$SH/common/sh_errno.c
+$SH/common/sh_log.c
+$SH/common/sh_ref.c
+$SH/common/sh_trampo.c
+$SH/common/sh_util.c
+$SH/third_party/xdl/xdl.c
+$SH/third_party/xdl/xdl_iterate.c
+$SH/third_party/xdl/xdl_linker.c
+$SH/third_party/xdl/xdl_lzma.c
+$SH/third_party/xdl/xdl_util.c
+"
+
+SH_INCLUDES="
+-I$SH
+-I$SH/include
+-I$SH/arch/arm64
+-I$SH/common
+-I$SH/third_party/xdl
+-I$SH/third_party/bsd
+-I$SH/third_party/lss
+"
+
+SH_OBJS=""
+for src in $SH_SRCS; do
+    [ -z "$src" ] && continue
+    src=$(echo "$src" | xargs)
+    if [ ! -f "$src" ]; then
+        echo "ERROR: shadowhook source not found: $src"
+        exit 1
+    fi
+
+    basename=$(echo "$src" | sed "s|$SH/||" | tr '/' '_')
+    obj="$BUILD_DIR/sh_${basename%.c}.o"
+    obj="${obj%.S.o}.o"
+
+    if [[ "$src" == *.S ]]; then
+        "$CC" $CFLAGS $SH_INCLUDES -c "$src" -o "$obj"
+    else
+        "$CC" $CFLAGS $SH_INCLUDES -c "$src" -o "$obj"
+    fi
+    SH_OBJS="$SH_OBJS $obj"
+done
+
+if [ -z "$SH_OBJS" ]; then
+    echo "ERROR: shadowhook produced no object files."
+    exit 1
+fi
+
+"$AR" rcs "$OUT_DIR/libshadowhook.a" $SH_OBJS
+SH_SIZE=$(wc -c < "$OUT_DIR/libshadowhook.a" 2>/dev/null || echo "unknown")
+echo "  Built $OUT_DIR/libshadowhook.a ($SH_SIZE bytes)"
+
+NOTHING_SRC="$SH/nothing/sh_nothing.c"
+if [ ! -f "$NOTHING_SRC" ]; then
+    echo "ERROR: ShadowHook companion source not found: $NOTHING_SRC"
+    exit 1
+fi
+
+"$CC" -shared -Oz -fPIC -fno-ident -fno-unwind-tables -fno-asynchronous-unwind-tables \
+    -nostdlib -nostartfiles -nodefaultlibs \
+    -Wl,-z,max-page-size=16384 \
+    -Wl,--strip-all -Wl,--as-needed -Wl,--hash-style=sysv \
+    -Wl,--build-id=none \
+    -o "$OUT_DIR/libshadowhook_nothing.so" "$NOTHING_SRC"
+echo "  Built $OUT_DIR/libshadowhook_nothing.so"