cross compile instructions; ignore toolchain files

Signed-off-by: lizzie <lizzie@eden-emu.dev>

.gitignore

@@ -20,6 +20,7 @@ log.txt
 # Generated source files
 src/common/scm_rev.cpp
 dist/english_plurals/generated_en.ts
+*-toolchain.cmake
 
 # Project/editor files
 *.swp

docs/CrossCompile.md

@@ -13,34 +13,16 @@ A painless guide for cross compilation (or to test NCE) from a x86_64 system wit
 
 This is a guide for FreeBSD users mainly.
 
-Now you got a PowerPC sysroot - quickly decompress it somewhere, say `/home/user/opt/powerpc64le`.
+Now you got a PowerPC sysroot - quickly decompress it somewhere, say `/home/user/opt/powerpc64le`. Create a toolchain file, for example `powerpc64le-toolchain.cmake`; always [consult the manual](https://man.freebsd.org/cgi/man.cgi?query=cmake-toolchains&sektion=7&manpath=FreeBSD+13.2-RELEASE+and+Ports).
 
-```sh
-fetch https://download.freebsd.org/ftp/releases/powerpc/powerpc64le/14.3-RELEASE/base.txz
-mkdir -p ~/opt/powerpc64le/sysroot
-mkdir -p ~/opt/powerpc64le/staging
-cd ~/opt/powerpc64le/sysroot
-tar -xvzf base.txz
-```
-
-Create a toolchain file, for example `powerpc64le-toolchain.cmake`; always [consult the manual](https://man.freebsd.org/cgi/man.cgi?query=cmake-toolchains&sektion=7&manpath=FreeBSD+13.2-RELEASE+and+Ports).
-
-```sh
-set(CMAKE_SYSROOT "$ENV{HOME}/opt/powerpc64le/sysroot")
-set(CMAKE_STAGING_PREFIX "$ENV{HOME}/opt/powerpc64le/sysroot")
-
-set(CMAKE_C_COMPILER /usr/bin/clang)
-set(CMAKE_CXX_COMPILER /usr/bin/clang++)
-set(CMAKE_C_FLAGS "--target=ppc64le-pc-freebsd")
-set(CMAKE_CXX_FLAGS "--target=ppc64le-pc-freebsd")
-
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
-```
+There is a script to automatically do all of this under `./tools/setup-cross-sysroot.sh`
 
 Specify:
 - `YUZU_USE_CPM`: Set this to `ON` so packages can be found and built if your sysroot doesn't have them.
 - `YUZU_USE_EXTERNAL_FFMPEG`: Set this to `ON` as well.
 
+Then run using a program such as QEMU to emulate userland syscalls:
+
+```sh
+cmake --build build-ppc64-pc-freebsd -t dynarmic_tests -- -j8 && qemu-ppc64-static -L $HOME/opt/ppc64-freebsd/sysroot ./build-ppc64-pc-freebsd/bin/dynarmic_tests
+```

externals/powah/powah_emit.hpp

@@ -8,6 +8,7 @@
 #include <ranges>
 #include <bit>
 #include <utility>
+#include <sys/mman.h>
 
 //#ifndef __cpp_lib_unreachable
 namespace std {

src/dynarmic/src/dynarmic/backend/ppc64/code_block.h

@@ -4,6 +4,7 @@
 #pragma once
 
 #include <cstdint>
+#include <cstdio>
 #include <new>
 #include <sys/mman.h>
 
@@ -15,7 +16,7 @@ namespace Dynarmic::Backend::PPC64 {
 class CodeBlock {
 public:
     explicit CodeBlock(std::size_t size) noexcept : memsize(size) {
-        mem = (u8*)mmap(nullptr, size, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_ANON | MAP_PRIVATE, -1, 0);
+        mem = (u8*)mmap(nullptr, size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
         ASSERT(mem != nullptr);
     }
     ~CodeBlock() noexcept {

tools/README.md

@@ -13,6 +13,7 @@ Tools for Eden and other subprojects.
 - `shellcheck.sh`: Ensure POSIX compliance (and syntax sanity) for all tools in this directory and subdirectories.
 - `llvmpipe-run.sh`: Sets environment variables needed to run any command (or Eden) with llvmpipe.
 - `optimize-assets.sh`: Optimizes PNG assets with OptiPng.
+- `setup-cross-sysroot.sh`: Allows to quickly create a sysroot of a given system for cross compilation (experimental).
 - `update-cpm.sh`: Updates CPM.cmake to the latest version.
 - `update-icons.sh`: Rebuild all icons (macOS, Windows, bitmaps) based on the master SVG file (`dist/dev.eden_emu.eden.svg`)
     * Also optimizes the master SVG

tools/setup-cross-sysroot.sh

@@ -0,0 +1,86 @@
+#!/bin/sh -e
+# SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+die() {
+	echo "$@" >&2
+	exit 1
+}
+help() {
+    cat << EOF
+--arch <name>       Specify the target architecture (default: ppc64)
+--os <name>         Specify the OS sysroot to use (default: freebsd)
+--sysroot <path>    Specify sysroot to use
+EOF
+}
+
+TARGET_ARCH="ppc64"
+TARGET_OS="freebsd"
+TARGET_CMAKE="$TARGET_ARCH-pc-$TARGET_OS"
+BASE_DIR="$PWD"
+
+while true; do
+	case "$1" in
+    --arch) shift; TARGET_ARCH=$1; [ -z "$TARGET_ARCH" ] && die "Expected argument";;
+    --os) shift; TARGET_OS=$1; [ -z "$TARGET_OS" ] && die "Expected argument";;
+    --sysroot) shift; SYSROOT=$1; [ -z "$SYSROOT" ] && die "Expected argument";;
+	--help) help "$@";;
+	--*) die "Invalid option $1" ;;
+	"$0" | "") break;;
+	esac
+	shift
+done
+
+[ -z "$SYSROOT" ] && SYSROOT="$HOME/opt/$TARGET_ARCH-$TARGET_OS/sysroot"
+mkdir -p "$SYSROOT" && cd "$SYSROOT"
+case "$TARGET_OS" in
+freebsd*)
+    case "$TARGET_ARCH" in
+        ppc64pe) URL="https://download.freebsd.org/ftp/releases/powerpc/powerpc64pe/14.3-RELEASE/base.txz" break;;
+        ppc64le) URL="https://download.freebsd.org/ftp/releases/powerpc/powerpc64le/14.3-RELEASE/base.txz" break;;
+        ppc64) URL="https://download.freebsd.org/ftp/releases/powerpc/powerpc64/14.3-RELEASE/base.txz" break;;
+        ppc) URL="https://download.freebsd.org/ftp/releases/powerpc/powerpc/14.3-RELEASE/base.txz" break;;
+        amd64 | x86_64) URL="https://download.freebsd.org/ftp/releases/amd64/14.3-RELEASE/base.txz" break;;
+        arm64*) URL="https://download.freebsd.org/ftp/releases/arm64/$TARGET_ARCH/14.3-RELEASE/base.txz" break;;
+        arm*) URL="https://download.freebsd.org/ftp/releases/arm/$TARGET_ARCH/14.3-RELEASE/base.txz" break;;
+        *) die "Unknown arch $TARGET_ARCH" break;;
+    esac
+    [ -z "$TARGET_CMAKE" ] && TARGET_CMAKE="$TARGET_ARCH-pc-$TARGET_OS"
+    [ -f "base.txz" ] || fetch "$URL" || die "Can't download"
+    tar -xvzf base.txz
+    break;;
+*) die "Unknown OS $TARGET_OS" break;;
+esac
+
+[ -z "$CC" ] && CC=$(which clang)
+[ -z "$CXX" ] && CXX=$(which clang++)
+
+TOOLCHAIN_FILE="$BASE_DIR/$TARGET_CMAKE-toolchain.cmake"
+cat << EOF >"$TOOLCHAIN_FILE"
+# Script to generate .cmake toolchain files :)
+# See https://man.freebsd.org/cgi/man.cgi?query=cmake-toolchains&sektion=7&manpath=FreeBSD+13.2-RELEASE+and+Ports
+
+set(CMAKE_SYSROOT "$SYSROOT")
+set(CMAKE_STAGING_PREFIX "$SYSROOT")
+
+set(CMAKE_C_COMPILER $CC)
+set(CMAKE_CXX_COMPILER $CXX)
+set(CMAKE_C_FLAGS "--target=$TARGET_CMAKE")
+set(CMAKE_CXX_FLAGS "--target=$TARGET_CMAKE")
+
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+EOF
+
+# cmake \
+#     -DCMAKE_TOOLCHAIN_FILE="$TOOLCHAIN_FILE" \
+#     -DCMAKE_BUILD_TYPE=Release \
+#     -B "build-$TARGET_CMAKE" \
+#     -DDYNARMIC_TESTS=ON \
+#     -DENABLE_QT=OFF \
+#     -DENABLE_SDL2=OFF \
+#     -DYUZU_USE_CPM=ON \
+#     -DYUZU_USE_EXTERNAL_FFMPEG=ON
+#cmake --build "build-$TARGET_CMAKE" dynarmic_tests -- -j8