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This commit is contained in:
Kartik Agaram 2018-10-30 22:36:52 -07:00
parent 0e6f3d086e
commit dd63f4dcb4
2 changed files with 13 additions and 12 deletions
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21
subx/055trace.subx
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@ -86,7 +86,7 @@ trace: # t : (address trace-stream), line : string
8b/copy 0/mod/indirect 7/rm32/EDI . . . 1/r32/ECX . . # copy *EDI to ECX
# EDX = t.length
8b/copy 1/mod/*+disp8 7/rm32/EDI . . . 2/r32/EDX 8/disp8 . # copy *(EDI+8) to EDX
# EAX = _append(&t.data[t.write], &t.data[t.length], line)
# EAX = _append-3(&t.data[t.write], &t.data[t.length], line)
# push line
56/push-ESI
# push &t.data[t.length]
@ -96,7 +96,7 @@ trace: # t : (address trace-stream), line : string
8d/copy-address 1/mod/*+disp8 4/rm32/sib 7/base/EDI 1/index/ECX . 3/r32/EBX 0xc/disp8 . # copy EDI+ECX+12 to EBX
53/push-EBX
# call
e8/call _append/disp32
e8/call _append-3/disp32
# discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
# if EAX == 0 return
@ -106,7 +106,7 @@ trace: # t : (address trace-stream), line : string
01/add 0/mod/indirect 7/rm32/EDI . . . 0/r32/EAX . . # add EAX to *EDI
# refresh ECX = t.write
8b/copy 0/mod/indirect 7/rm32/EDI . . . 1/r32/ECX . . # copy *EDI to ECX
# EAX = _append(&t.data[t.write], &t.data[t.length], line)
# EAX = _append-3(&t.data[t.write], &t.data[t.length], line)
# push line
68/push Newline/imm32
# push &t.data[t.length]
@ -116,7 +116,7 @@ trace: # t : (address trace-stream), line : string
8d/copy-address 1/mod/*+disp8 4/rm32/sib 7/base/EDI 1/index/ECX . 3/r32/EBX 0xc/disp8 . # copy EDI+ECX+12 to EBX
53/push-EBX
# call
e8/call _append/disp32
e8/call _append-3/disp32
# discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
# t.write += EAX
@ -134,7 +134,8 @@ $trace:end:
5d/pop-to-EBP
c3/return
_append: # out : address, outend : address, s : (array byte) -> num_bytes_appended/EAX
# 3-argument variant of _append
_append-3: # out : address, outend : address, s : (array byte) -> num_bytes_appended/EAX
# prolog
55/push-EBP
89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP
@ -158,13 +159,13 @@ _append: # out : address, outend : address, s : (array byte) -> num_bytes_appen
8d/copy-address 1/mod/*+disp8 4/rm32/sib 6/base/ESI 1/index/ECX . 1/r32/ECX 4/disp8 . # copy ESI+ECX+4 to ECX
# ESI/src = &line.data[0]
81 0/subop/add 3/mod/direct 6/rm32/ESI . . . . . 4/imm32 # add to ESI
$_append:loop:
$_append-3:loop:
# if ESI/src >= ECX/srcend break
39/compare 3/mod/direct 6/rm32/ESI . . . 1/r32/ECX . . # compare ESI with ECX
7d/jump-if-greater-or-equal $_append:end/disp8
7d/jump-if-greater-or-equal $_append-3:end/disp8
# if EDI/out >= EDX/outend break (for now silently ignore filled up trace buffer)
39/compare 3/mod/direct 7/rm32/EDI . . . 2/r32/EDX . . # compare EDI with EDX
7d/jump-if-greater-or-equal $_append:end/disp8
7d/jump-if-greater-or-equal $_append-3:end/disp8
# copy one byte from ESI/src to EDI/out
8a/copy-byte 0/mod/indirect 6/rm32/ESI . . . 3/r32/BL . . # copy byte at *ESI to BL
88/copy-byte 0/mod/indirect 7/rm32/EDI . . . 3/r32/BL . . # copy byte at BL to *EDI
@ -172,8 +173,8 @@ $_append:loop:
40/increment-EAX
46/increment-ESI
47/increment-EDI
eb/jump $_append:loop/disp8
$_append:end:
eb/jump $_append-3:loop/disp8
$_append-3:end:
# restore registers
5f/pop-to-EDI
5e/pop-to-ESI

4
subx/056write.subx
View File

@ -70,7 +70,7 @@ $write:fake:
8b/copy 0/mod/indirect 1/rm32/ECX . . . 2/r32/EDX . . # copy *ECX to EDX
# EBX = f.length
8b/copy 1/mod/*+disp8 1/rm32/ECX . . . 3/r32/EBX 8/disp8 . # copy *(ECX+8) to EBX
# EAX = _append(&f.data[f.write], &f.data[f.length], s)
# EAX = _append-3(&f.data[f.write], &f.data[f.length], s)
# push s
ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none . . 0xc/disp8 . # push *(EBP+12)
# push &f.data[f.length]
@ -80,7 +80,7 @@ $write:fake:
8d/copy-address 1/mod/*+disp8 4/rm32/sib 1/base/ECX 2/index/EDX . 3/r32/EBX 0xc/disp8 . # copy ECX+EDX+12 to EBX
53/push-EBX
# call
e8/call _append/disp32
e8/call _append-3/disp32
# discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
# f.write += EAX