From 155be962b77e8cdbaff674073b24c87a7beab85e Mon Sep 17 00:00:00 2001
From: bQUARKz <bquarkz@gmail.com>
Date: Fri, 20 Feb 2026 04:47:50 +0000
Subject: [PATCH] pr5.4

---
 .../prometeu-vm/tests/verifier_golden.rs      | 44 +++++++++++++++++++
 files/TODOs.md                                | 44 -------------------
 2 files changed, 44 insertions(+), 44 deletions(-)

diff --git a/crates/console/prometeu-vm/tests/verifier_golden.rs b/crates/console/prometeu-vm/tests/verifier_golden.rs
index 976229c1..766e88f8 100644
--- a/crates/console/prometeu-vm/tests/verifier_golden.rs
+++ b/crates/console/prometeu-vm/tests/verifier_golden.rs
@@ -225,6 +225,50 @@ fn golden_err_invalid_syscall_id() {
     assert_eq!(res, Err(VerifierError::InvalidSyscallId { pc: 0, id: 0xDEADBEEF }));
 }
 
+#[test]
+fn golden_err_syscall_too_few_args() {
+    // Choose a syscall that requires 2 arg slots and returns 0: LogWrite (0x5001)
+    // Program: SYSCALL 0x5001; RET
+    // No arguments are pushed before the syscall, so verifier must catch underflow at the syscall.
+    let mut code = Vec::new();
+    code.extend_from_slice(&enc_op(OpCode::Syscall));
+    code.extend_from_slice(&0x5001u32.to_le_bytes());
+    code.extend_from_slice(&enc_op(OpCode::Ret));
+
+    let functions = func(FunctionMeta { code_offset: 0, code_len: code.len() as u32, return_slots: 0, ..Default::default() });
+    let res = Verifier::verify(&code, &functions);
+    assert_eq!(res, Err(VerifierError::StackUnderflow { pc: 0, opcode: OpCode::Syscall }));
+}
+
+#[test]
+fn golden_ok_syscall_args_and_returns() {
+    // Case A: Syscall with 2 args, 0 returns (LogWrite): push 2; syscall; ret (ret_slots = 0)
+    let mut code_a = Vec::new();
+    code_a.extend_from_slice(&enc_op(OpCode::PushI32));
+    code_a.extend_from_slice(&1i32.to_le_bytes());
+    code_a.extend_from_slice(&enc_op(OpCode::PushI32));
+    code_a.extend_from_slice(&2i32.to_le_bytes());
+    code_a.extend_from_slice(&enc_op(OpCode::Syscall));
+    code_a.extend_from_slice(&0x5001u32.to_le_bytes()); // LogWrite: 2 args, 0 returns
+    code_a.extend_from_slice(&enc_op(OpCode::Ret));
+
+    let functions_a = func(FunctionMeta { code_offset: 0, code_len: code_a.len() as u32, return_slots: 0, ..Default::default() });
+    let res_a = Verifier::verify(&code_a, &functions_a).unwrap();
+    // Max stack height reaches 2 after two pushes
+    assert!(res_a[0] >= 2);
+
+    // Case B: Syscall with 0 args, 1 return (TouchGetX: 0x2101): syscall; ret (ret_slots = 1)
+    let mut code_b = Vec::new();
+    code_b.extend_from_slice(&enc_op(OpCode::Syscall));
+    code_b.extend_from_slice(&0x2101u32.to_le_bytes()); // TouchGetX: 0 args, 1 return
+    code_b.extend_from_slice(&enc_op(OpCode::Ret));
+
+    let functions_b = func(FunctionMeta { code_offset: 0, code_len: code_b.len() as u32, return_slots: 1, ..Default::default() });
+    let res_b = Verifier::verify(&code_b, &functions_b).unwrap();
+    // Max stack height should be at least 1 due to the return value
+    assert!(res_b[0] >= 1);
+}
+
 #[test]
 fn golden_err_invalid_func_id() {
     // Encode a Call with invalid function id (beyond functions.len())
diff --git a/files/TODOs.md b/files/TODOs.md
index 66c3bdc4..f2960f5c 100644
--- a/files/TODOs.md
+++ b/files/TODOs.md
@@ -1,47 +1,3 @@
-# PR-5.5 — Remove Legacy Syscall Entry Paths
-
-### Briefing
-
-Any old or experimental syscall entry paths must be removed so that the slot-based ABI is the only supported mechanism.
-
-### Target
-
-* Ensure only the new unified syscall dispatch path exists.
-
-### Work items
-
-* Search for legacy or alternate syscall invocation logic.
-* Remove or refactor them to use the canonical dispatch.
-* Update modules and exports accordingly.
-
-### Acceptance checklist
-
-* [ ] Only one syscall dispatch path remains.
-* [ ] No legacy syscall logic is present.
-* [ ] `cargo test` passes.
-
-### Tests
-
-* Existing tests only.
-
-### Junie instructions
-
-**You MAY:**
-
-* Remove legacy syscall code paths.
-* Refactor callers to use the unified dispatch.
-
-**You MUST NOT:**
-
-* Introduce new syscall semantics.
-* Keep compatibility shims.
-
-**If unclear:**
-
-* Ask before deleting anything that looks externally visible.
-
----
-
 # PR-5.6 — Syscall Multi-Return Tests
 
 ### Briefing