1 files changed, 10 insertions, 0 deletions
diff --git a/subx/020elf.cc b/subx/020elf.cc
index d5f1e109..807010ea 100644
--- a/subx/020elf.cc
+++ b/subx/020elf.cc
@@ -6,6 +6,7 @@ if (is_equal(argv[1], "run")) {
   assert(argc > 2);
   reset();
   cerr << std::hex;
+  initialize_mem();
   load_elf(argv[2]);
   while (EIP < End_of_program)  // weak final-gasp termination check
     run_one_instruction();
@@ -90,6 +91,15 @@ void load_segment_from_program_header(uint8_t* elf_contents, size_t size, uint32
     End_of_program = p_vaddr+p_memsz;
 }
 
+void initialize_mem() {
+  // Very primitive/fixed/insecure ELF segments for now.
+  //   code: 0x08048000 -> 0x08048fff
+  //   data: 0x08049000 -> 0x08049fff
+  //   heap: 0x0804a000 -> 0x0804afff
+  //   stack: 0x0804bfff -> 0x0804b000 (downward)
+  Mem.resize(0x0804c000 - 0x08048000);
+}
+
 inline uint32_t u32_in(uint8_t* p) {
   return p[0] | p[1] << 8 | p[2] << 16 | p[3] << 24;
 }