--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/uprogs/elf.h	Sun Oct 22 18:25:39 2017 +0900
@@ -0,0 +1,42 @@
+// Format of an ELF executable file
+
+#define ELF_MAGIC 0x464C457FU  // "\x7FELF" in little endian
+
+// File header
+struct elfhdr {
+  uint magic;  // must equal ELF_MAGIC
+  uchar elf[12];
+  ushort type;
+  ushort machine;
+  uint version;
+  uint entry;
+  uint phoff;
+  uint shoff;
+  uint flags;
+  ushort ehsize;
+  ushort phentsize;
+  ushort phnum;
+  ushort shentsize;
+  ushort shnum;
+  ushort shstrndx;
+};
+
+// Program section header
+struct proghdr {
+  uint type;
+  uint off;
+  uint vaddr;
+  uint paddr;
+  uint filesz;
+  uint memsz;
+  uint flags;
+  uint align;
+};
+
+// Values for Proghdr type
+#define ELF_PROG_LOAD           1
+
+// Flag bits for Proghdr flags
+#define ELF_PROG_FLAG_EXEC      1
+#define ELF_PROG_FLAG_WRITE     2
+#define ELF_PROG_FLAG_READ      4