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feat: change oob behavior of RETURNDATALOAD and RETURNDATACOPY #90

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Merged
pdobacz merged 2 commits into from
May 29, 2024
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feat: change oob behavior of RETURNDATALOAD and RETURNDATACOPY #90

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change oob behavior of RETURNDATALOAD and RETURNDATACOPY
charles-cooper Apr 17, 2024
85c74af
move returndatacopy change to Modified Behavior
charles-cooper Apr 18, 2024
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change oob behavior of RETURNDATALOAD and RETURNDATACOPY 
use zero-padding instead of exceptional halt
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@charles-cooper
charles-cooper committed Apr 17, 2024
commit 5740164401e832a65b71b9a246e98967b114fabb
4 changes: 3 additions & 1 deletion spec/eof.md
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Expand Up @@ -294,8 +294,10 @@ The following instructions are introduced in EOF code:
- `RETURNDATALOAD (0xf7)` instruction
- deduct 3 gas
- pop `offset` from the stack
- if `offset + 32 > len(returndata buffer)`, execution results in an exceptional halt
- push 1 item onto the stack, the 32-byte word read from the returndata buffer starting at `offset`
- if `offset + 32 > len(returndata buffer)` the result is zero-padded (same behavior as `CALLDATALOAD`).
- `RETURNDATACOPY (0x3E)` instruction
- same behavior as legacy, but changes the exceptional halt behavior to zero-padding behavior (same behavior as `CALLDATACOPY`).
- `EXTCALL (0xf8)`, `EXTDELEGATECALL (0xf9)`, `EXTSTATICCALL (0xfb)`
- Replacement of `CALL`, `DELEGATECALL` and `STATICCALL` instructions, as specced out in [EIP-7069](https://eips.ethereum.org/EIPS/eip-7069), except the runtime operand stack check. In particular:
- The `gas_limit` input is removed.
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