SIMD-0166: SBPF Dynamic stack frames #166
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LucasSte
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ravyu-jump
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Sep 2, 2024
LucasSte
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0x0ece
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Nov 22, 2024
| call convention obviates the need to use R5 for retrieving the caller’s frame | ||
| pointer address to access those parameters. | ||
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| ### Changes in the verifier |
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I would simplify this section. ATM it seems to describe the whole process of validating registers, not just the changes due to this SIMD.
The verifier should include a new rule to accept R11 as a destination register under the following conditions:
- Dynamic stack frames are enabled
- The corresponding instruction is
add64_imm(opcode0x07) - The corresponding value of
immis a multiple of the alignment (i.e. multiple of 64).
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As a comment to my comment :) Based on the current code, I'd simply add an extra "and" to the "if" condition that returns Ok() for R11. Therefore I don't think we need an error for alignment. Either R11 is allowed (if all 3 conditions pass), or it's not.
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I re-wrote the section, based on the new design we devised with only R10.
0x0ece
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Lichtso
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Jun 30, 2025
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Dynamic stack frames are available by building a Solana program using
cargo-build-sbf --arch v1.