Renames MM_PROGRAM_START => MM_RODATA_START.

src/debugger.rs

@@ -153,8 +153,8 @@ fn get_host_ptr<C: ContextObject>(
     interpreter: &mut Interpreter<C>,
     mut vm_addr: u64,
 ) -> Result<*mut u8, EbpfError> {
-    if vm_addr < ebpf::MM_PROGRAM_START {
-        vm_addr += ebpf::MM_PROGRAM_START;
+    if vm_addr < ebpf::MM_RODATA_START {
+        vm_addr += ebpf::MM_RODATA_START;
     }
     match interpreter.vm.memory_mapping.map(
         AccessType::Load,

src/ebpf.rs

@@ -44,14 +44,18 @@ pub const VIRTUAL_ADDRESS_BITS: usize = 32;
 // Memory map regions virtual addresses need to be (1 << VIRTUAL_ADDRESS_BITS) bytes apart.
 // Also the region at index 0 should be skipped to catch NULL ptr accesses.
 
-/// Start of the program bits (text and ro segments) in the memory map
-pub const MM_PROGRAM_START: u64 = 0x100000000;
+/// Size (and alignment) of a memory region
+pub const MM_REGION_SIZE: u64 = 0x100000000;
+/// Start of the bytecode in the memory map (SBPFv2 only)
+pub const MM_BYTECODE_START: u64 = 0;
+/// Start of the readonly data in the memory map (contains the bytecode in SBPFv1)
+pub const MM_RODATA_START: u64 = MM_REGION_SIZE;
 /// Start of the stack in the memory map
-pub const MM_STACK_START: u64 = 0x200000000;
+pub const MM_STACK_START: u64 = MM_REGION_SIZE * 2;
 /// Start of the heap in the memory map
-pub const MM_HEAP_START: u64 = 0x300000000;
+pub const MM_HEAP_START: u64 = MM_REGION_SIZE * 3;
 /// Start of the input buffers in the memory map
-pub const MM_INPUT_START: u64 = 0x400000000;
+pub const MM_INPUT_START: u64 = MM_REGION_SIZE * 4;
 
 // eBPF op codes.
 // See also https://www.kernel.org/doc/Documentation/networking/filter.txt