Data update

Task/Machine-code/Pluto/machine-code-1.pluto

@@ -0,0 +1,23 @@
+/* mclib.c */
+
+// gcc -c -fpic mclib.c
+// gcc -shared -o mclib.so mclib.o
+
+#include <string.h>
+#include <sys/mman.h>
+
+typedef unsigned char uchar;
+
+extern uchar run_machine_code(const char *code, uchar a, uchar b, int len) {
+    void *buf;
+    uchar c;
+    /* copy code to executable buffer */
+    buf = mmap (0, len, PROT_READ|PROT_WRITE|PROT_EXEC,
+                MAP_PRIVATE | MAP_ANON, -1, 0);
+    memcpy (buf, code, len);
+    /* run code */
+    c = ((uchar (*) (uchar, uchar))buf)(a, b);
+    /* free buffer */
+    munmap (buf, len);
+    return c;
+}

Task/Machine-code/Pluto/machine-code-2.pluto

@@ -0,0 +1,19 @@
+local ffi = require "pluto:ffi"
+local lib = ffi.open("./mclib.so")
+lib:cdef[[
+unsigned char run_machine_code(const char *code, unsigned char a, unsigned char b, int len);
+]]
+
+local a = 7
+local b = 12
+
+-- x64 opcodes for this task
+local m = {
+    0x55, 0x48, 0x89, 0xe5, 0x89, 0x7d,
+    0xfc, 0x89, 0x75, 0xf8, 0x8b, 0x75,
+    0xfc, 0x03, 0x75, 0xf8, 0x89, 0x75,
+    0xf4, 0x8b, 0x45, 0xf4, 0x5d, 0xc3
+}
+
+local code = m:mapped(|byte| -> string.char(byte)):concat("")
+print($"{a} + {b} = {lib.run_machine_code(code, a, b, #m)}")