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o1vm/riscv32im: helper to read a uint32 from memory #2916

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o1vm/riscv32im: helper to read a uint32 from memory #2916

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11 changes: 11 additions & 0 deletions o1vm/src/interpreters/riscv32im/witness.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -945,4 +945,15 @@ impl<Fp: Field> Env<Fp> {
pub fn normalized_instruction_counter(&self) -> u64 {
self.instruction_counter / MAX_ACC
}

/// Get a u32 from memory, starting from address `addr`.
pub fn get_uint32(&mut self, addr: u32) -> u32 {
let page = addr >> PAGE_ADDRESS_SIZE;
let page_address = (addr & PAGE_ADDRESS_MASK) as usize;
let memory_page_idx = self.get_memory_page_index(page);
let value = self.memory[memory_page_idx].1[page_address..page_address + 4]
.try_into()
.expect("get_uint32 values fit in a u32");
u32::from_be_bytes(value)
}
}
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