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| author | Kartik Agaram <vc@akkartik.com> | 2018-10-30 22:45:42 -0700 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2018-10-30 22:46:05 -0700 |
| commit | b3d8c144a48dc974dca23af8924c774d5cc5e4f7 (patch) | |
| tree | 91df4d2af634635c38b5b9e679a6566883d77bf9 /subx/055trace.subx | |
| parent | 2f55dd757e4ae68849baf5481ff099ab3be29092 (diff) | |
| download | mu-b3d8c144a48dc974dca23af8924c774d5cc5e4f7.tar.gz | |
4740
Diffstat (limited to 'subx/055trace.subx')
| -rw-r--r-- | subx/055trace.subx | 110 |
1 files changed, 57 insertions, 53 deletions
diff --git a/subx/055trace.subx b/subx/055trace.subx index f547e650..37497aed 100644 --- a/subx/055trace.subx +++ b/subx/055trace.subx @@ -1,4 +1,4 @@ -# helpers for emitting traces to a trace stream, and for tests to check the trace stream +# primitives for emitting traces to a trace stream, and for tests to check the trace stream # # A trace stream looks like this: # read : int # index that we've read until @@ -134,58 +134,6 @@ $trace:end: 5d/pop-to-EBP c3/return -# 3-argument variant of _append -_append-3: # out : address, outend : address, s : (array byte) -> num_bytes_appended/EAX - # prolog - 55/push-EBP - 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP - # save registers - 51/push-ECX - 52/push-EDX - 53/push-EBX - 56/push-ESI - 57/push-EDI - # EAX/num_bytes_appended = 0 - b8/copy-to-EAX 0/imm32 - # EDI = out - 8b/copy 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none 7/r32/EDI 0x8/disp8 . # copy *(EBP+8) to EDI - # EDX = outend - 8b/copy 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none 2/r32/EDX 0xc/disp8 . # copy *(EBP+12) to EDX - # ESI = s - 8b/copy 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none 6/r32/ESI 0x10/disp8 . # copy *(EBP+16) to ESI - # ECX = s.length - 8b/copy 0/mod/indirect 6/rm32/ESI . . . 1/r32/ECX . . # copy *ESI to ECX - # ECX/srcend = &s.data[s.length] - 8d/copy-address 1/mod/*+disp8 4/rm32/sib 6/base/ESI 1/index/ECX . 1/r32/ECX 4/disp8 . # copy ESI+ECX+4 to ECX - # ESI/src = &s.data[0] - 81 0/subop/add 3/mod/direct 6/rm32/ESI . . . . . 4/imm32 # add to ESI -$_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-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-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 - # updates - 40/increment-EAX - 46/increment-ESI - 47/increment-EDI - eb/jump $_append-3:loop/disp8 -$_append-3:end: - # restore registers - 5f/pop-to-EDI - 5e/pop-to-ESI - 5b/pop-to-EBX - 5a/pop-to-EDX - 59/pop-to-ECX - # epilog - 89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP - 5d/pop-to-EBP - c3/return - clear-trace-stream: # t : (address trace-stream) # prolog 55/push-EBP @@ -224,6 +172,8 @@ $clear-trace-stream:end: 5d/pop-to-EBP c3/return +## tests + test-trace-single: # clear-trace-stream(Test-trace-stream) # push args @@ -322,4 +272,58 @@ test-trace-empty-line: # end c3/return +## helpers + +# 3-argument variant of _append +_append-3: # out : address, outend : address, s : (array byte) -> num_bytes_appended/EAX + # prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # save registers + 51/push-ECX + 52/push-EDX + 53/push-EBX + 56/push-ESI + 57/push-EDI + # EAX/num_bytes_appended = 0 + b8/copy-to-EAX 0/imm32 + # EDI = out + 8b/copy 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none 7/r32/EDI 0x8/disp8 . # copy *(EBP+8) to EDI + # EDX = outend + 8b/copy 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none 2/r32/EDX 0xc/disp8 . # copy *(EBP+12) to EDX + # ESI = s + 8b/copy 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none 6/r32/ESI 0x10/disp8 . # copy *(EBP+16) to ESI + # ECX = s.length + 8b/copy 0/mod/indirect 6/rm32/ESI . . . 1/r32/ECX . . # copy *ESI to ECX + # ECX/srcend = &s.data[s.length] + 8d/copy-address 1/mod/*+disp8 4/rm32/sib 6/base/ESI 1/index/ECX . 1/r32/ECX 4/disp8 . # copy ESI+ECX+4 to ECX + # ESI/src = &s.data[0] + 81 0/subop/add 3/mod/direct 6/rm32/ESI . . . . . 4/imm32 # add to ESI +$_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-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-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 + # updates + 40/increment-EAX + 46/increment-ESI + 47/increment-EDI + eb/jump $_append-3:loop/disp8 +$_append-3:end: + # restore registers + 5f/pop-to-EDI + 5e/pop-to-ESI + 5b/pop-to-EBX + 5a/pop-to-EDX + 59/pop-to-ECX + # epilog + 89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP + 5d/pop-to-EBP + c3/return + # vim:nowrap:textwidth=0 |