1 files changed, 60 insertions, 0 deletions
diff --git a/third_party/rust/goblin/src/mach/bind_opcodes.rs b/third_party/rust/goblin/src/mach/bind_opcodes.rs
new file mode 100644
index 0000000000..970ab10af1
--- /dev/null
+++ b/third_party/rust/goblin/src/mach/bind_opcodes.rs
@@ -0,0 +1,60 @@
+//! Bind opcodes are interpreted by the dynamic linker to efficiently collect every symbol imported by this binary, and from which library using two-level namespacing
+//!
+//! Some uses of external symbols do not need to be bound immediately.
+//! Instead they can be lazily bound on first use.  The lazy_bind
+//! are contains a stream of BIND opcodes to bind all lazy symbols.
+//! Normal use is that dyld ignores the lazy_bind section when
+//! loading an image.  Instead the static linker arranged for a
+//! lazy pointer to initially point to a helper function which
+//! pushes the offset into the lazy_bind area for the symbol
+//! needing to be bound, then jumps to dyld which simply adds
+//! the offset to lazy_bind_off to get the information on what
+//! to bind.
+
+pub type Opcode = u8;
+
+// The following are used to encode binding information
+pub const BIND_TYPE_POINTER: u8 = 1;
+pub const BIND_TYPE_TEXT_ABSOLUTE32: u8 = 2;
+pub const BIND_TYPE_TEXT_PCREL32: u8 = 3;
+pub const BIND_SPECIAL_DYLIB_SELF: u8 = 0;
+pub const BIND_SPECIAL_DYLIB_MAIN_EXECUTABLE: u8 = 0xf; // -1
+pub const BIND_SPECIAL_DYLIB_FLAT_LOOKUP: u8 = 0xe; // -2
+pub const BIND_SYMBOL_FLAGS_WEAK_IMPORT: u8 = 0x1;
+pub const BIND_SYMBOL_FLAGS_NON_WEAK_DEFINITION: u8 = 0x8;
+pub const BIND_OPCODE_MASK: u8 = 0xF0;
+pub const BIND_IMMEDIATE_MASK: u8 = 0x0F;
+pub const BIND_OPCODE_DONE: Opcode = 0x00;
+pub const BIND_OPCODE_SET_DYLIB_ORDINAL_IMM: Opcode = 0x10;
+pub const BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB: Opcode = 0x20;
+pub const BIND_OPCODE_SET_DYLIB_SPECIAL_IMM: Opcode = 0x30;
+pub const BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM: Opcode = 0x40;
+pub const BIND_OPCODE_SET_TYPE_IMM: Opcode = 0x50;
+pub const BIND_OPCODE_SET_ADDEND_SLEB: Opcode = 0x60;
+pub const BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB: Opcode = 0x70;
+pub const BIND_OPCODE_ADD_ADDR_ULEB: Opcode = 0x80;
+pub const BIND_OPCODE_DO_BIND: Opcode = 0x90;
+pub const BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB: Opcode = 0xA0;
+pub const BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED: Opcode = 0xB0;
+pub const BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB: Opcode = 0xC0;
+
+pub fn opcode_to_str(opcode: Opcode) -> &'static str {
+    match opcode {
+        BIND_OPCODE_DONE => "BIND_OPCODE_DONE",
+        BIND_OPCODE_SET_DYLIB_ORDINAL_IMM => "BIND_OPCODE_SET_DYLIB_ORDINAL_IMM",
+        BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB => "BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB",
+        BIND_OPCODE_SET_DYLIB_SPECIAL_IMM => "BIND_OPCODE_SET_DYLIB_SPECIAL_IMM",
+        BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM => "BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM",
+        BIND_OPCODE_SET_TYPE_IMM => "BIND_OPCODE_SET_TYPE_IMM",
+        BIND_OPCODE_SET_ADDEND_SLEB => "BIND_OPCODE_SET_ADDEND_SLEB",
+        BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB => "BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB",
+        BIND_OPCODE_ADD_ADDR_ULEB => "BIND_OPCODE_ADD_ADDR_ULEB",
+        BIND_OPCODE_DO_BIND => "BIND_OPCODE_DO_BIND",
+        BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB => "BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB",
+        BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED => "BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED",
+        BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB => {
+            "BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB"
+        }
+        _ => "UNKNOWN OPCODE",
+    }
+}