diff --git a/evm/src/cpu/kernel/asm/hash/blake2b/main.asm b/evm/src/cpu/kernel/asm/hash/blake2b/main.asm
index 5e36ba72..933de505 100644
--- a/evm/src/cpu/kernel/asm/hash/blake2b/main.asm
+++ b/evm/src/cpu/kernel/asm/hash/blake2b/main.asm
@@ -1,14 +1,15 @@
 global blake2b:
     // stack: virt, num_bytes, retdest
-    POP
-    // stack: num_bytes, retdest
-    DUP1
-    // stack: num_bytes, num_bytes, retdest
+    DUP2
+    // stack: num_bytes, virt, num_bytes, retdest
     %add_const(127)
     %div_const(128)
-    // stack: num_blocks = ceil(num_bytes / 128), num_bytes, retdest
-    %mstore_kernel_general(0)
-    // stack: num_bytes, retdest
-    %mstore_kernel_general(1)
+    // stack: num_blocks = ceil(num_bytes / 128), virt, num_bytes, retdest
+    DUP2
+    // stack: virt, num_blocks, virt, num_bytes, retdest
+    %mstore_kernel_general
+    // stack: virt, num_bytes, retdest
+    %add_const(1)
+    %mstore_kernel_general
     // stack: retdest
     %jump(blake2b_compression)
diff --git a/evm/src/cpu/kernel/asm/hash/ripemd/main.asm b/evm/src/cpu/kernel/asm/hash/ripemd/main.asm
index 32d1994b..4aa6a6ad 100644
--- a/evm/src/cpu/kernel/asm/hash/ripemd/main.asm
+++ b/evm/src/cpu/kernel/asm/hash/ripemd/main.asm
@@ -6,13 +6,14 @@
 ///     STATE, count, _buffer = ripemd_update(STATE, count, _buffer, padlength(len(input)), bytes =     [0x80]+[0]*63)
 ///     STATE, count, _buffer = ripemd_update(STATE, count, _buffer,                     8, bytes = size(len(_input)))
 ///     return process(STATE)
-///
-/// ripemd is called on
-///     // stack: length
+/// 
+/// The hardcoded memory structure, where each register is only a byte, is given as follows
+///     { 0-63: buffer, 64-71: bytes(8*len(_input)), 72-135: [0x80]+[0]*63 }
 ///
 /// ripemd_update receives and return the stack in the form:
 ///     stack: STATE, count, length, virt
 /// where virt is the virtual address of the bytes argument
+///
 
 global ripemd:
     // stack:                               virt, length
@@ -52,7 +53,7 @@ global ripemd:
     %stack (virt, length) -> (        0, length, virt, ripemd_1, ripemd_2, process)
     // stack:                 count = 0, length, virt, ripemd_1, ripemd_2, process
     %stack () -> (0x67452301, 0xEFCDAB89, 0x98BADCFE, 0x10325476, 0xC3D2E1F0)
-    // stack:     0x67452301, 0xEFCDAB89, 0x98BADCFE, 0x10325476, 0xC3D2E1F0, count, length, virt, LABELS
+    // stack:                                  STATE, count, length, virt, LABELS
     %jump(ripemd_update)
 
 ripemd_1:
diff --git a/evm/src/cpu/kernel/asm/hash/sha2/main.asm b/evm/src/cpu/kernel/asm/hash/sha2/main.asm
index e842d8be..058224f6 100644
--- a/evm/src/cpu/kernel/asm/hash/sha2/main.asm
+++ b/evm/src/cpu/kernel/asm/hash/sha2/main.asm
@@ -1,16 +1,19 @@
 global sha2:
-    // stack: virt, length
-    POP
-    // stack:       length
-    %mstore_kernel_general(0)
+    // stack: virt, num_bytes, retdest
+    SWAP1
+    // stack: num_bytes, virt, retdest
+    DUP2
+    // stack: virt, num_bytes, virt, retdest
+    %mstore_kernel_general
+    // stack: virt, retdest
+    
 
-// Precodition: input is in memory, starting at 0 of kernel general segment, of the form
+// Precodition: input is in memory, starting at virt of kernel general segment, of the form
 //              num_bytes, x[0], x[1], ..., x[num_bytes - 1]
 // Postcodition: output is in memory, starting at 0, of the form
 //               num_blocks, block0[0], ..., block0[63], block1[0], ..., blocklast[63]
 global sha2_pad:
-    // stack: retdest
-    PUSH 0
+    // stack: virt, retdest
     %mload_kernel_general
     // stack: num_bytes, retdest
     // STEP 1: append 1
diff --git a/evm/src/cpu/kernel/tests/hash.rs b/evm/src/cpu/kernel/tests/hash.rs
index e6a3d2a0..2456c31d 100644
--- a/evm/src/cpu/kernel/tests/hash.rs
+++ b/evm/src/cpu/kernel/tests/hash.rs
@@ -41,18 +41,18 @@ fn make_random_input() -> Vec<u8> {
 fn make_interpreter_setup(
     message: Vec<u8>,
     hash_fn_label: &str,
-    hash_input_virt: usize,
+    hash_input_virt: (usize, usize),
 ) -> InterpreterMemoryInitialization {
     InterpreterMemoryInitialization {
         label: hash_fn_label.to_string(),
         stack: vec![
-            U256::from(hash_input_virt),
+            U256::from(hash_input_virt.0),
             U256::from(message.len()),
             U256::from(0xdeadbeefu32),
         ],
         segment: KernelGeneral,
         memory: vec![(
-            hash_input_virt,
+            hash_input_virt.1,
             message.iter().map(|&x| U256::from(x as u32)).collect(),
         )],
     }
@@ -64,7 +64,7 @@ fn combine_u256s(hi: U256, lo: U256) -> U512 {
 
 fn prepare_test<T>(
     hash_fn_label: &str,
-    hash_input_virt: usize,
+    hash_input_virt: (usize, usize),
     standard_implementation: &dyn Fn(Vec<u8>) -> T,
 ) -> Result<(T, Vec<U256>)> {
     // Make the input.
@@ -84,7 +84,7 @@ fn prepare_test<T>(
 
 fn test_hash_256(
     hash_fn_label: &str,
-    hash_input_virt: usize,
+    hash_input_virt: (usize, usize),
     standard_implementation: &dyn Fn(Vec<u8>) -> U256,
 ) -> Result<()> {
     let (expected, result_stack) =
@@ -101,7 +101,7 @@ fn test_hash_256(
 
 fn test_hash_512(
     hash_fn_label: &str,
-    hash_input_virt: usize,
+    hash_input_virt: (usize, usize),
     standard_implementation: &dyn Fn(Vec<u8>) -> U512,
 ) -> Result<()> {
     let (expected, result_stack) =
@@ -118,15 +118,15 @@ fn test_hash_512(
 
 #[test]
 fn test_blake2b() -> Result<()> {
-    test_hash_512("blake2b", 2, &blake2b)
+    test_hash_512("blake2b", (0,2), &blake2b)
 }
 
 #[test]
 fn test_ripemd() -> Result<()> {
-    test_hash_256("ripemd", 200, &ripemd)
+    test_hash_256("ripemd", (200, 200), &ripemd)
 }
 
 #[test]
 fn test_sha2() -> Result<()> {
-    test_hash_256("sha2", 1, &sha2)
+    test_hash_256("sha2", (0, 1), &sha2)
 }