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Merge pull request #624 from mir-protocol/mload_kernel_code_u32

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Add a `mload_kernel_code_u32` macro
This commit is contained in:
Daniel Lubarov 2022-07-19 12:18:15 -07:00 committed by GitHub
commit e3f7cc21c1
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2 changed files with 48 additions and 0 deletions
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7
evm/src/cpu/kernel/asm/basic_macros.asm
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@ -82,6 +82,13 @@
// stack: input / c, ...
%endmacro
%macro shl_const(c)
// stack: input, ...
PUSH $c
SHL
// stack: input << c, ...
%endmacro
%macro eq_const(c)
// stack: input, ...
PUSH $c

41
evm/src/cpu/kernel/asm/memory.asm
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@ -26,6 +26,47 @@
// stack: (empty)
%endmacro
// Load a single byte from kernel code.
%macro mload_kernel_code
// stack: offset
PUSH @SEGMENT_CODE
// stack: segment, offset
PUSH 0 // kernel has context 0
// stack: context, segment, offset
MLOAD_GENERAL
// stack: value
%endmacro
// Load a big-endian u32, consisting of 4 bytes (c_3, c_2, c_1, c_0),
// from kernel code.
%macro mload_kernel_code_u32
// stack: offset
DUP1
%mload_kernel_code
// stack: c_3, offset
%shl_const(8)
// stack: c_3 << 8, offset
DUP2
%add_const(1)
%mload_kernel_code
OR
// stack: (c_3 << 8) | c_2, offset
%shl_const(8)
// stack: ((c_3 << 8) | c_2) << 8, offset
DUP2
%add_const(2)
%mload_kernel_code
OR
// stack: (((c_3 << 8) | c_2) << 8) | c_1, offset
%shl_const(8)
// stack: ((((c_3 << 8) | c_2) << 8) | c_1) << 8, offset
SWAP1
%add_const(3)
%mload_kernel_code
OR
// stack: (((((c_3 << 8) | c_2) << 8) | c_1) << 8) | c_0
%endmacro
// Copies `count` values from
// SRC = (src_ctx, src_segment, src_addr)
// to