diff --git a/.github/workflows/sh4_test.yml b/.github/workflows/sh4_test.yml
index aa3235bd..bbfecd27 100644
--- a/.github/workflows/sh4_test.yml
+++ b/.github/workflows/sh4_test.yml
@@ -14,11 +14,11 @@ jobs:
               with:
                   repository: SingleStepTests/sh4
                   path: ~/dev/sh4_json/
+            - name: Move JSON test files
+              run: mv /home/runner/work/Deecy/Deecy/~/dev/sh4_json ../SingleStepTests_sh4/
             - name: Transcode JSON test files
-              working-directory: ~/dev/sh4_json/
+              working-directory: ../SingleStepTests_sh4/
               run: python ./transcode_json.py
-            - name: Move JSON test files
-              run: find . -name "~/dev/sh4_json/*.json" -exec mv "{}" ../SingleStepTests_sh4/ \;
             - uses: goto-bus-stop/setup-zig@v2
               with:
                 version: 0.12.0-dev.3180+83e578a18
diff --git a/src/jit/arm_jit.zig b/src/jit/arm_jit.zig
index 50b215d5..7e040b7d 100644
--- a/src/jit/arm_jit.zig
+++ b/src/jit/arm_jit.zig
@@ -54,7 +54,8 @@ const BlockCache = struct {
 
     pub fn deinit(self: *@This()) void {
         self._allocator.free(self.buffer);
-        std.os.windows.VirtualFree(self.blocks.ptr, 0, std.os.windows.MEM_RELEASE);
+
+        self.deallocate_blocks();
     }
 
     pub fn signal_write(self: *@This(), addr: u32) void {
@@ -67,17 +68,41 @@ const BlockCache = struct {
     }
 
     fn allocate_blocks(self: *@This()) !void {
-        if (@import("builtin").os.tag != .windows) {
-            @compileError("Unsupported OS - Use mmap on Linux here.");
+        switch (@import("builtin").os.tag) {
+            .windows => {
+                const blocks = try std.os.windows.VirtualAlloc(
+                    null,
+                    @sizeOf(?BasicBlock) * BlockEntryCount,
+                    std.os.windows.MEM_RESERVE | std.os.windows.MEM_COMMIT,
+                    std.os.windows.PAGE_READWRITE,
+                );
+                self.blocks = @as([*]?BasicBlock, @alignCast(@ptrCast(blocks)))[0..BlockEntryCount];
+            },
+            .linux => {
+                const blocks = try std.posix.mmap(
+                    null,
+                    @sizeOf(?BasicBlock) * BlockEntryCount,
+                    std.posix.PROT.READ | std.posix.PROT.WRITE | std.posix.PROT.EXEC,
+                    .{ .TYPE = .PRIVATE, .EXECUTABLE = true },
+                    -1,
+                    0,
+                );
+                self.blocks = @as([*]?BasicBlock, @alignCast(@ptrCast(blocks)))[0..BlockEntryCount];
+            },
+            else => @compileError("Unsupported OS."),
         }
+    }
 
-        const blocks = try std.os.windows.VirtualAlloc(
-            null,
-            @sizeOf(?BasicBlock) * BlockEntryCount,
-            std.os.windows.MEM_RESERVE | std.os.windows.MEM_COMMIT,
-            std.os.windows.PAGE_READWRITE,
-        );
-        self.blocks = @as([*]?BasicBlock, @alignCast(@ptrCast(blocks)))[0..BlockEntryCount];
+    fn deallocate_blocks(self: *@This()) void {
+        switch (@import("builtin").os.tag) {
+            .windows => {
+                std.os.windows.VirtualFree(self.blocks.ptr, 0, std.os.windows.MEM_RELEASE);
+            },
+            .linux => {
+                std.posix.munmap(@as([*]align(std.mem.page_size) const u8, @alignCast(@ptrCast(self.blocks.ptr)))[0 .. self.blocks.len * @sizeOf(?BasicBlock)]);
+            },
+            else => @compileError("Unsupported OS."),
+        }
     }
 
     pub fn reset(self: *@This()) !void {
@@ -85,7 +110,7 @@ const BlockCache = struct {
 
         self.cursor = 0;
 
-        std.os.windows.VirtualFree(self.blocks.ptr, 0, std.os.windows.MEM_RELEASE);
+        self.deallocate_blocks();
         try self.allocate_blocks();
 
         self.min_address = std.math.maxInt(u32);
diff --git a/src/jit/sh4_jit.zig b/src/jit/sh4_jit.zig
index 3e35f2ea..d3f29b69 100644
--- a/src/jit/sh4_jit.zig
+++ b/src/jit/sh4_jit.zig
@@ -50,29 +50,52 @@ const BlockCache = struct {
     pub fn deinit(self: *@This()) void {
         self._allocator.free(self.buffer);
 
-        std.os.windows.VirtualFree(self.blocks.ptr, 0, std.os.windows.MEM_RELEASE);
+        self.deallocate_blocks();
     }
 
     fn allocate_blocks(self: *@This()) !void {
-        if (@import("builtin").os.tag != .windows) {
-            @compileError("Unsupported OS - Use mmap on Linux here.");
+        switch (@import("builtin").os.tag) {
+            .windows => {
+                const blocks = try std.os.windows.VirtualAlloc(
+                    null,
+                    @sizeOf(?BasicBlock) * BlockEntryCount,
+                    std.os.windows.MEM_RESERVE | std.os.windows.MEM_COMMIT,
+                    std.os.windows.PAGE_READWRITE,
+                );
+                self.blocks = @as([*]?BasicBlock, @alignCast(@ptrCast(blocks)))[0..BlockEntryCount];
+            },
+            .linux => {
+                const blocks = try std.posix.mmap(
+                    null,
+                    @sizeOf(?BasicBlock) * BlockEntryCount,
+                    std.posix.PROT.READ | std.posix.PROT.WRITE | std.posix.PROT.EXEC,
+                    .{ .TYPE = .PRIVATE, .EXECUTABLE = true },
+                    -1,
+                    0,
+                );
+                self.blocks = @as([*]?BasicBlock, @alignCast(@ptrCast(blocks)))[0..BlockEntryCount];
+            },
+            else => @compileError("Unsupported OS."),
         }
+    }
 
-        const blocks = try std.os.windows.VirtualAlloc(
-            null,
-            @sizeOf(?BasicBlock) * BlockEntryCount,
-            std.os.windows.MEM_RESERVE | std.os.windows.MEM_COMMIT,
-            std.os.windows.PAGE_READWRITE,
-        );
-        self.blocks = @as([*]?BasicBlock, @alignCast(@ptrCast(blocks)))[0..BlockEntryCount];
+    fn deallocate_blocks(self: *@This()) void {
+        switch (@import("builtin").os.tag) {
+            .windows => {
+                // FIXME: Can I merely decommit and re-commit it?
+                std.os.windows.VirtualFree(self.blocks.ptr, 0, std.os.windows.MEM_RELEASE);
+            },
+            .linux => {
+                std.posix.munmap(@as([*]align(std.mem.page_size) const u8, @alignCast(@ptrCast(self.blocks.ptr)))[0 .. self.blocks.len * @sizeOf(?BasicBlock)]);
+            },
+            else => @compileError("Unsupported OS."),
+        }
     }
 
     pub fn reset(self: *@This()) !void {
         self.cursor = 0;
 
-        // FIXME: Can I merely decommit and re-commit it?
-        std.os.windows.VirtualFree(self.blocks.ptr, 0, std.os.windows.MEM_RELEASE);
-
+        self.deallocate_blocks();
         try self.allocate_blocks();
     }