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Merge pull request #1017 from mir-protocol/expmod-fix

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expmod edge case fix
This commit is contained in:
Nicholas Ward 2023-05-02 10:46:39 -07:00 committed by GitHub
commit 4380395e8b
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1 changed files with 18 additions and 6 deletions
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24
evm/src/cpu/kernel/asm/core/precompiles/expmod.asm
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@ -209,9 +209,9 @@ l_E_prime_return:
DUP1
%ceil_div_const(16)
// stack: num_limbs, num_bytes, len, len, l_M, l_E, l_B, kexit_info
DUP1
DUP2
ISZERO
%jumpi(copy_b_end)
%jumpi(copy_b_len_zero)
SWAP1
// stack: num_bytes, num_limbs, len, len, l_M, l_E, l_B, kexit_info
%stack () -> (@SEGMENT_CALLDATA, 96)
@ -226,6 +226,10 @@ l_E_prime_return:
// stack: b_loc=0, num_limbs, limbs[num_limbs-1], .., limbs[0], len, l_M, l_E, l_B, kexit_info
%store_limbs
// stack: len, l_M, l_E, l_B, kexit_info
%jump(copy_b_end)
copy_b_len_zero:
// stack: num_limbs, num_bytes, len, len, l_M, l_E, l_B, kexit_info
%pop3
copy_b_end:
// Copy E to kernel general memory.
@ -237,9 +241,9 @@ copy_b_end:
DUP1
%ceil_div_const(16)
// stack: num_limbs, num_bytes, len, len, l_M, l_E, l_B, kexit_info
DUP1
DUP2
ISZERO
%jumpi(copy_e_end)
%jumpi(copy_e_len_zero)
SWAP1
// stack: num_bytes, num_limbs, len, len, l_M, l_E, l_B, kexit_info
DUP7
@ -254,6 +258,10 @@ copy_b_end:
// stack: e_loc=len, num_limbs, limbs[num_limbs-1], .., limbs[0], len, l_M, l_E, l_B, kexit_info
%store_limbs
// stack: len, l_M, l_E, l_B, kexit_info
%jump(copy_e_end)
copy_e_len_zero:
// stack: num_limbs, num_bytes, len, len, l_M, l_E, l_B, kexit_info
%pop3
copy_e_end:
// Copy M to kernel general memory.
@ -265,9 +273,9 @@ copy_e_end:
DUP1
%ceil_div_const(16)
// stack: num_limbs, num_bytes, len, len, l_M, l_E, l_B, kexit_info
DUP1
DUP2
ISZERO
%jumpi(copy_m_end)
%jumpi(copy_m_len_zero)
SWAP1
// stack: num_bytes, num_limbs, len, len, l_M, l_E, l_B, kexit_info
DUP7
@ -285,6 +293,10 @@ copy_e_end:
// stack: m_loc=2*len, num_limbs, limbs[num_limbs-1], .., limbs[0], len, l_M, l_E, l_B, kexit_info
%store_limbs
// stack: len, l_M, l_E, l_B, kexit_info
%jump(copy_m_end)
copy_m_len_zero:
// stack: num_limbs, num_bytes, len, len, l_M, l_E, l_B, kexit_info
%pop3
copy_m_end:
%stack (len, l_M, ls: 2) -> (len, l_M)