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mu/linux/survey_baremetal.subx
Kartik K. Agaram 827dd4a7fe start throwing error on duplicate label 
One less error that's only in the bootstrap phase.

On the other hand, for simplicity I got rid of the ability to override
the Entry label. One less special case, but we're also going further
from the ability to run subsets of layers. We haven't really been
exercising it for a long time, though (commit 7842, March 2021 when we
made baremetal the default).
2021-08-22 21:09:28 -07:00

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# Assign addresses (co-ordinates) to labels (landmarks) in a program
# (landscape) on stdin.
#
# To build:
# $ bootstrap/bootstrap translate [01]*.subx subx-params.subx survey_baremetal.subx -o survey_baremetal
#
# The expected input is a stream of bytes and some interspersed labels.
# Comments and '==' segment headers are allowed, but segment names are ignored.
# Mappings between labels and addresses are emitted to stdout, assuming the
# program starts at address 0x7c00. Addresses in segment headers are optional.
#
# $ cat x
# == code
# l1:
# aa bb l1/imm8
# cc dd l2/disp32
# l2:
# ee foo/imm32
# == data 0x7c10
# foo:
# 34
#
# The output is a list of labels and their computed addresses.
#
# $ cat x |bootstrap/bootstrap run survey_baremetal
# 0x7c00 l1
# 0x7c09 l2
# 0x7c10 foo
== code
# instruction effective address register displacement immediate
# . op subop mod rm32 base index scale r32
# . 1-3 bytes 3 bits 2 bits 3 bits 3 bits 3 bits 2 bits 2 bits 0/1/2/4 bytes 0/1/2/4 bytes
Entry: # run tests if necessary, convert stdin if not
# . prologue
89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
# Heap = new-segment(Heap-size)
# . . push args
68/push Heap/imm32
ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Heap-size/disp32 # push *Heap-size
# . . call
e8/call new-segment/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# initialize-trace-stream(Trace-size)
# . . push args
ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-size/disp32 # push *Heap-size
# . . call
e8/call initialize-trace-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# - if argc > 1 and argv[1] == "test", then return run_tests()
# if (argc <= 1) goto interactive
81 7/subop/compare 1/mod/*+disp8 5/rm32/ebp . . . . 0/disp8 1/imm32 # compare *ebp
7e/jump-if-<= $subx-survey-main:interactive/disp8
# if (!kernel-string-equal?(argv[1], "test")) goto interactive
# . eax = kernel-string-equal?(argv[1], "test")
# . . push args
68/push "test"/imm32
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8)
# . . call
e8/call kernel-string-equal?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . if (eax == false) goto interactive
3d/compare-eax-and 0/imm32/false
74/jump-if-= $subx-survey-main:interactive/disp8
# run-tests()
e8/call run-tests/disp32
# syscall_exit(*Num-test-failures)
8b/copy 0/mod/indirect 5/rm32/.disp32 . . 3/r32/ebx Num-test-failures/disp32 # copy *Num-test-failures to ebx
eb/jump $subx-survey-main:end/disp8
$subx-survey-main:interactive:
# - otherwise convert stdin
# subx-survey(Stdin, Stdout)
# . . push args
68/push Stdout/imm32
68/push Stdin/imm32
# . . call
e8/call subx-survey/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . write-stream(2/stderr, Trace-stream)
#? # . . push args
#? ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write-stream/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# syscall_exit(0)
bb/copy-to-ebx 0/imm32
$subx-survey-main:end:
e8/call syscall_exit/disp32
subx-survey: # infile: (addr buffered-file), out: (addr buffered-file)
# pseudocode
# var in: (stream byte Input-size)
# slurp(infile, in)
# var labels: (stream {label-name, address} Max-labels)
# compute-addresses(in, labels)
# emit-labels(out, labels)
#
# . prologue
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
56/push-esi
# var labels/edx: (stream {label-name, address} Max-labels)
# (we get more rows than Max-labels advertises because row size is smaller than in survey_elf)
# . data
2b/subtract 0/mod/indirect 5/rm32/.disp32 . . 4/r32/esp Max-labels/disp32 # subtract *Max-labels from esp
# . size
ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Max-labels/disp32 # push *Max-labels
# . read
68/push 0/imm32/read
# . write
68/push 0/imm32/write
89/copy 3/mod/direct 2/rm32/edx . . . 4/r32/esp . . # copy esp to edx
# var in/esi: (stream byte Input-size)
# . data
2b/subtract 0/mod/indirect 5/rm32/.disp32 . . 4/r32/esp Input-size/disp32 # subtract *Input-size from esp
# . size
ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Input-size/disp32 # push *Input-size
# . read
68/push 0/imm32/read
# . write
68/push 0/imm32/write
89/copy 3/mod/direct 6/rm32/esi . . . 4/r32/esp . . # copy esp to esi
# slurp(infile, in)
# . . push args
56/push-esi
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8)
# . . call
e8/call slurp/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# compute-addresses(in, labels)
# . . push args
52/push-edx
56/push-esi
# . . call
e8/call compute-addresses/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# emit-labels(out, labels)
# . . push args
52/push-edx
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 0xc/disp8 . # push *(ebp+12)
# . . call
e8/call emit-labels/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# flush(out)
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 0xc/disp8 . # push *(ebp+12)
# . . call
e8/call flush/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
$subx-survey:end:
# . reclaim locals
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0x18/imm32 # add to esp
03/add 0/mod/indirect 5/rm32/.disp32 . . 4/r32/esp Max-labels/disp32 # add *Max-labels to esp
03/add 0/mod/indirect 5/rm32/.disp32 . . 4/r32/esp Input-size/disp32 # add *Input-size to esp
# . restore registers
5e/pop-to-esi
5a/pop-to-edx
59/pop-to-ecx
# . epilogue
89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
5d/pop-to-ebp
c3/return
test-subx-survey-computes-addresses:
# input:
# == code
# ab x/imm32
# == data
# x:
# 01
#
# trace contains (in any order):
# label x is at address 0x7c05
#
# . prologue
55/push-ebp
89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
# setup
# . clear-stream(_test-input-stream)
# . . push args
68/push _test-input-stream/imm32
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# . clear-stream($_test-input-buffered-file->buffer)
# . . push args
68/push $_test-input-buffered-file->buffer/imm32
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# . clear-stream(_test-output-stream)
# . . push args
68/push _test-output-stream/imm32
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# . clear-stream($_test-output-buffered-file->buffer)
# . . push args
68/push $_test-output-buffered-file->buffer/imm32
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# initialize input
# . write(_test-input-stream, "== code\n")
# . . push args
68/push "== code\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . write(_test-input-stream, "ab x/imm32\n")
# . . push args
68/push "ab x/imm32\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . write(_test-input-stream, "== data\n")
# . . push args
68/push "== data\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . write(_test-input-stream, "x:\n")
# . . push args
68/push "x:\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . write(_test-input-stream, "01\n")
# . . push args
68/push "01\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# subx-survey(_test-input-buffered-file, _test-output-buffered-file)
# . . push args
68/push _test-output-buffered-file/imm32
68/push _test-input-buffered-file/imm32
# . . call
e8/call subx-survey/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# check trace
#? # dump *Trace-stream {{{
#? # . write(2/stderr, "^")
#? # . . push args
#? 68/push "^"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . write-stream(2/stderr, *Trace-stream)
#? # . . push args
#? ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write-stream/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . write(2/stderr, "$\n")
#? # . . push args
#? 68/push "$\n"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # }}}
# . check-trace-contains("label 'x' is at address 0x00007c05.", msg)
# . . push args
68/push "F - test-subx-survey-computes-addresses/0"/imm32
68/push "label 'x' is at address 0x00007c05."/imm32
# . . call
e8/call check-trace-contains/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . epilogue
89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
5d/pop-to-ebp
c3/return
test-subx-survey-computes-addresses-with-padding:
# input:
# == code
# ab x/imm32
# == data 0x7c10
# x:
# 01
#
# trace contains (in any order):
# label x is at address 0x7c10
#
# . prologue
55/push-ebp
89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
# setup
# . clear-stream(_test-input-stream)
# . . push args
68/push _test-input-stream/imm32
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# . clear-stream($_test-input-buffered-file->buffer)
# . . push args
68/push $_test-input-buffered-file->buffer/imm32
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# . clear-stream(_test-output-stream)
# . . push args
68/push _test-output-stream/imm32
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# . clear-stream($_test-output-buffered-file->buffer)
# . . push args
68/push $_test-output-buffered-file->buffer/imm32
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# initialize input
# . write(_test-input-stream, "== code\n")
# . . push args
68/push "== code\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . write(_test-input-stream, "ab x/imm32\n")
# . . push args
68/push "ab x/imm32\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . write(_test-input-stream, "== data\n")
# . . push args
68/push "== data 0x7c10\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . write(_test-input-stream, "x:\n")
# . . push args
68/push "x:\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . write(_test-input-stream, "01\n")
# . . push args
68/push "01\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# subx-survey(_test-input-buffered-file, _test-output-buffered-file)
# . . push args
68/push _test-output-buffered-file/imm32
68/push _test-input-buffered-file/imm32
# . . call
e8/call subx-survey/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# check trace
#? # dump *Trace-stream {{{
#? # . write(2/stderr, "^")
#? # . . push args
#? 68/push "^"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . write-stream(2/stderr, *Trace-stream)
#? # . . push args
#? ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write-stream/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . write(2/stderr, "$\n")
#? # . . push args
#? 68/push "$\n"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # }}}
# . check-trace-contains("label 'x' is at address 0x00007c10.", msg)
# . . push args
68/push "F - test-subx-survey-computes-addresses-with-padding/0"/imm32
68/push "label 'x' is at address 0x00007c10."/imm32
# . . call
e8/call check-trace-contains/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . epilogue
89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
5d/pop-to-ebp
c3/return
compute-addresses: # in: (addr stream byte), labels: (addr stream {(handle array byte), address})
# pseudocode:
# var current-address = 0x7c00
# var line: (stream byte 512)
# while true # line loop
# clear-stream(line)
# read-line(in, line)
# if (line->write == 0) break # end of file
# while true # word loop
# word-slice = next-word(line)
# if slice-empty?(word-slice) # end of line
# break
# else if slice-starts-with?(word-slice, "#") # comment
# break # end of line
# else if slice-equal?(word-slice, "==") # segment header
# word-slice = next-word(line)
# if slice-empty?(word-slice)
# abort
# word-slice = next-word(line) # segment address
# if slice-empty?(word-slice)
# goto line-loop # segment address is optional
# new-address = parse-hex-int-from-slice(word-slice)
# if new-address < current-address
# abort
# current-address = new-address
# else if label?(word-slice)
# strip trailing ':' from word-slice
# var tmp/eax: (addr int) = insert-slice-or-abort(labels, word-slice)
# *tmp = current-address
# trace("label '" word-slice "' is at address " current-address ".")
# # labels occupy no space, so no need to increment offsets
# else
# width = compute-width-of-slice(word-slice)
# current-address += width
#
# . prologue
55/push-ebp
89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
# . save registers
50/push-eax
51/push-ecx
52/push-edx
53/push-ebx
56/push-esi
57/push-edi
# var current-address/esi: int = 0x7c00
be/copy-to-esi 0x7c00/imm32
# var line/ecx: (stream byte 512)
81 5/subop/subtract 3/mod/direct 4/rm32/esp . . . . . 0x200/imm32 # subtract from esp
68/push 0x200/imm32/size
68/push 0/imm32/read
68/push 0/imm32/write
89/copy 3/mod/direct 1/rm32/ecx . . . 4/r32/esp . . # copy esp to ecx
# var word-slice/edx: (addr slice)
68/push 0/imm32
68/push 0/imm32
89/copy 3/mod/direct 2/rm32/edx . . . 4/r32/esp . . # copy esp to edx
$compute-addresses:line-loop:
# clear-stream(line)
# . . push args
51/push-ecx
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# read-line(in, line)
# . . push args
51/push-ecx
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8)
# . . call
e8/call read-line/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# if (line->write == 0) break
8b/copy 0/mod/indirect 1/rm32/ecx . . . 0/r32/eax . . # copy *ecx to eax
3d/compare-eax-and 0/imm32
0f 84/jump-if-= $compute-addresses:end/disp32
#? # dump line {{{
#? # . write(2/stderr, "LL: ")
#? # . . push args
#? 68/push "LL: "/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # write-stream(2/stderr, line)
#? # . . push args
#? 51/push-ecx
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write-stream/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . write(2/stderr, "$\n")
#? # . . push args
#? 68/push "$\n"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . rewind-stream(line)
#? # . . push args
#? 51/push-ecx
#? # . . call
#? e8/call rewind-stream/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
#? # }}}
$compute-addresses:word-loop:
# next-word(line, word-slice)
# . . push args
52/push-edx
51/push-ecx
# . . call
e8/call next-word/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
$compute-addresses:case-empty:
# if slice-empty?(word-slice) break
# . eax = slice-empty?(word-slice)
# . . push args
52/push-edx
# . . call
e8/call slice-empty?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# . if (eax != false) break
3d/compare-eax-and 0/imm32/false
0f 85/jump-if-!= $compute-addresses:line-loop/disp32
$compute-addresses:case-comment:
# if slice-starts-with?(word-slice, "#") break
# . . push args
68/push "#"/imm32
52/push-edx
# . . call
e8/call slice-starts-with?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . if (eax != false) break
3d/compare-eax-and 0/imm32/false
0f 85/jump-if-!= $compute-addresses:line-loop/disp32
$compute-addresses:case-segment-header:
# if !slice-equal?(word-slice, "==") goto next case
# . eax = slice-equal?(word-slice, "==")
# . . push args
68/push "=="/imm32
52/push-edx
# . . call
e8/call slice-equal?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . if (eax != false) break
3d/compare-eax-and 0/imm32/false
0f 84/jump-if-= $compute-addresses:case-label/disp32
# next-word(line, word-slice)
# . . push args
52/push-edx
51/push-ecx
# . . call
e8/call next-word/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# if slice-empty?(word-slice) abort
# . eax = slice-empty?(word-slice)
# . . push args
52/push-edx
# . . call
e8/call slice-empty?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# . if (eax != false) abort
3d/compare-eax-and 0/imm32/false
0f 85/jump-if-!= $compute-addresses:abort/disp32
# next-word(line, word-slice)
# . . push args
52/push-edx
51/push-ecx
# . . call
e8/call next-word/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# if slice-empty?(word-slice) break
# . eax = slice-empty?(word-slice)
# . . push args
52/push-edx
# . . call
e8/call slice-empty?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# . if (eax != false) break
3d/compare-eax-and 0/imm32/false
0f 85/jump-if-!= $compute-addresses:line-loop/disp32
# var new-address/eax: int = parse-hex-int-from-slice(word-slice)
# . . push args
52/push-edx
# . . call
e8/call parse-hex-int-from-slice/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# if (new-address < current-address) abort
39/compare 3/mod/direct 0/rm32/eax . . . 6/r32/esi . . # compare eax with esi
0f 82/jump-if-addr< $compute-addresses:error-bad-segment-address/disp32
# current-address = new-address
89/copy 3/mod/direct 6/rm32/esi . . . 0/r32/eax . . # copy eax to esi
# break
e9/jump $compute-addresses:line-loop/disp32
$compute-addresses:case-label:
# if (!label?(word-slice)) goto next case
# . eax = label?(word-slice)
# . . push args
52/push-edx
# . . call
e8/call label?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# . if (eax == false) goto next case
3d/compare-eax-and 0/imm32/false
0f 84/jump-if-= $compute-addresses:case-default/disp32
# strip trailing ':' from word-slice
ff 1/subop/decrement 1/mod/*+disp8 2/rm32/edx . . . . 4/disp8 . # decrement *(edx+4)
# var tmp/eax: (addr int) = insert-slice-or-abort(labels, word-slice, row-size=12)
# . . push args
68/push Heap/imm32
68/push 0xc/imm32/row-size
52/push-edx
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 0xc/disp8 . # push *(ebp+12)
# . . call
e8/call insert-slice-or-abort/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0x10/imm32 # add to esp
# *tmp = current-address
89/copy 0/mod/indirect 0/rm32/eax . . . 6/r32/esi . . # copy esi to *eax
# trace-slsns("label '" word-slice "' is at address " current-address ".")
# . . push args
68/push "."/imm32
56/push-esi
68/push "' is at address "/imm32
52/push-edx
68/push "label '"/imm32
# . . call
e8/call trace-slsns/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0x14/imm32 # add to esp
# continue
e9/jump $compute-addresses:word-loop/disp32
$compute-addresses:case-default:
# width/eax = compute-width-of-slice(word-slice)
# . . push args
52/push-edx
# . . call
e8/call compute-width-of-slice/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# current-address += width
01/add 3/mod/direct 6/rm32/esi . . . 0/r32/eax . . # add eax to *esi
#? # dump segment-offset {{{
#? # . write(2/stderr, "segment-offset: ")
#? # . . push args
#? 68/push "segment-offset: "/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . clear-stream($Stderr->buffer)
#? # . . push args
#? 68/push $Stderr->buffer/imm32
#? # . . call
#? e8/call clear-stream/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
#? # . write-int32-hex-buffered(Stderr, segment-offset)
#? # . . push args
#? 52/push-edx
#? ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . compute-addresses:segment-offset/disp32 # push *segment-offset
#? 68/push Stderr/imm32
#? # . . call
#? e8/call write-int32-hex-buffered/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . flush(Stderr)
#? # . . push args
#? 68/push Stderr/imm32
#? # . . call
#? e8/call flush/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
#? # . write(2/stderr, "\n")
#? # . . push args
#? 68/push Newline/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # }}}
e9/jump $compute-addresses:word-loop/disp32
$compute-addresses:end:
# . reclaim locals
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0x214/imm32 # add to esp
# . restore registers
5f/pop-to-edi
5e/pop-to-esi
5b/pop-to-ebx
5a/pop-to-edx
59/pop-to-ecx
58/pop-to-eax
# . epilogue
89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
5d/pop-to-ebp
c3/return
$compute-addresses:abort:
# . _write(2/stderr, error)
# . . push args
68/push "'==' must be followed by segment name and optionally an address\n"/imm32
68/push 2/imm32/stderr
# . . call
e8/call _write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . syscall_exit(1)
bb/copy-to-ebx 1/imm32
e8/call syscall_exit/disp32
# never gets here
$compute-addresses:error-bad-segment-address:
# . _write(2/stderr, error)
# . . push args
68/push "'==' specifies an address that implies negative padding\n"/imm32
68/push 2/imm32/stderr
# . . call
e8/call _write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . syscall_exit(1)
bb/copy-to-ebx 1/imm32
e8/call syscall_exit/disp32
# never gets here
test-compute-addresses:
# input:
# == code
# ab x/imm32 # skip comment
# == data
# 00
# x:
# 34
#
# trace contains (in any order):
# label 'x' is at address 0x7c06.
#
# . prologue
55/push-ebp
89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
# setup
# . clear-stream(_test-input-stream)
# . . push args
68/push _test-input-stream/imm32
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# var labels/edx: (stream byte 2*12)
81 5/subop/subtract 3/mod/direct 4/rm32/esp . . . . . 0x18/imm32 # subtract from esp
68/push 0x18/imm32/size
68/push 0/imm32/read
68/push 0/imm32/write
89/copy 3/mod/direct 2/rm32/edx . . . 4/r32/esp . . # copy esp to edx
# initialize input
# . write(_test-input-stream, "== code\n")
# . . push args
68/push "== code\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . write(_test-input-stream, "ab x/imm32 # skip comment\n")
# . . push args
68/push "ab x/imm32 # skip comment\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . write(_test-input-stream, "== data\n")
# . . push args
68/push "== data\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . write(_test-input-stream, "00\n")
# . . push args
68/push "00\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . write(_test-input-stream, "x:\n")
# . . push args
68/push "x:\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . write(_test-input-stream, "34\n")
# . . push args
68/push "34\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# compute-addresses(_test-input-stream, labels)
# . . push args
52/push-edx
68/push _test-input-stream/imm32
# . . call
e8/call compute-addresses/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # dump *Trace-stream {{{
#? # . write(2/stderr, "^")
#? # . . push args
#? 68/push "^"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . write-stream(2/stderr, *Trace-stream)
#? # . . push args
#? ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write-stream/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . write(2/stderr, "$\n")
#? # . . push args
#? 68/push "$\n"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # }}}
# . check-trace-contains("label 'x' is at address 0x00007c06.", msg)
# . . push args
68/push "F - test-compute-addresses"/imm32
68/push "label 'x' is at address 0x00007c06."/imm32
# . . call
e8/call check-trace-contains/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . check-ints-equal(labels->write, 0xc, msg)
# . . push args
68/push "F - test-compute-addresses-maintains-labels-write-index"/imm32
68/push 0xc/imm32/1-entry
ff 6/subop/push 0/mod/indirect 2/rm32/edx . . . . . . # push *edx
# . . call
e8/call check-ints-equal/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
# . reclaim locals
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0x24/imm32 # add to esp
# . epilogue
89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
5d/pop-to-ebp
c3/return
emit-labels: # out: (addr buffered-file), labels: (addr stream {(handle array byte), address})
# pseudocode:
# curr = table->data
# max = &table->data[table->write]
# while curr < max
# var label: (addr array byte) = lookup(*curr)
# curr += 8
# write-buffered(out, label)
# write-buffered(out, ' ')
# write-buffered(out, *curr)
# curr += 4
# write(out, '\n')
# return 0
#
# . prologue
55/push-ebp
89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
# . save registers
50/push-eax
51/push-ecx
52/push-edx
56/push-esi
# esi = table
8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 6/r32/esi 0xc/disp8 . # copy *(ebp+12) to esi
# var curr/ecx: (addr handle array byte) = table->data
8d/copy-address 1/mod/*+disp8 6/rm32/esi . . . 1/r32/ecx 0xc/disp8 . # copy esi+12 to ecx
# var max/edx: (addr byte) = &table->data[table->write]
8b/copy 0/mod/indirect 6/rm32/esi . . . 2/r32/edx . . # copy *esi to edx
8d/copy-address 0/mod/indirect 4/rm32/sib 1/base/ecx 2/index/edx . 2/r32/edx . . # copy ecx+edx to edx
$emit-labels:loop:
# if (curr >= max) return null
39/compare 3/mod/direct 1/rm32/ecx . . . 2/r32/edx . . # compare ecx with edx
0f 83/jump-if-addr>= $emit-labels:end/disp32
# var label/eax: (addr array byte) = lookup(*curr)
# . . push args
ff 6/subop/push 1/mod/*+disp8 1/rm32/ecx . . . . 4/disp8 . # push *(ecx+4)
ff 6/subop/push 0/mod/indirect 1/rm32/ecx . . . . . . # push *ecx
# . . call
e8/call lookup/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# curr += 8
81 0/subop/add 3/mod/direct 1/rm32/ecx . . . . . 8/imm32 # add to ecx
# write-buffered(out, label)
# . . push args
50/push-eax
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8)
# . . call
e8/call write-buffered/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# write-buffered(out, ' ')
# . . push args
68/push Space/imm32
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8)
# . . call
e8/call write-buffered/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . flush(Stderr)
# . . push args
68/push Stderr/imm32
# . . call
e8/call flush/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# write-int32-hex-buffered(out, *curr)
# . . push args
ff 6/subop/push 0/mod/indirect 1/rm32/ecx . . . . . . # push *ecx
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8)
# . . call
e8/call write-int32-hex-buffered/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# curr += 4
81 0/subop/add 3/mod/direct 1/rm32/ecx . . . . . 4/imm32 # add to ecx
# write-buffered(out, '\n')
# . . push args
68/push Newline/imm32
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8)
# . . call
e8/call write-buffered/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# loop
e9/jump $emit-labels:loop/disp32
$emit-labels:end:
# . restore registers
5e/pop-to-esi
5a/pop-to-edx
59/pop-to-ecx
58/pop-to-eax
# . epilogue
89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
5d/pop-to-ebp
c3/return
# - some helpers for tests
# some variants of 'trace' that take multiple arguments in different combinations of types:
# n: int
# c: character [4-bytes, will eventually be UTF-8]
# s: (addr array byte)
# l: (addr slice)
# one gotcha: 's5' must not be empty
trace-slsns: # s1: (addr array byte), l2: (addr slice), s3: (addr array byte), n4: int, s5: (addr array byte)
# . prologue
55/push-ebp
89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
# write(*Trace-stream, s1)
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8)
ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# write-slice(*Trace-stream, l2)
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 0xc/disp8 . # push *(ebp+12)
ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
# . . call
e8/call write-slice/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# write(*Trace-stream, s3)
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 0x10/disp8 . # push *(ebp+16)
ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# write-int32-hex(*Trace-stream, n4)
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 0x14/disp8 . # push *(ebp+20)
ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
# . . call
e8/call write-int32-hex/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# trace(s5) # implicitly adds a newline and finalizes the trace line
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 0x18/disp8 . # push *(ebp+24)
# . . call
e8/call trace/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
$trace-slsns:end:
# . epilogue
89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
5d/pop-to-ebp
c3/return
test-trace-slsns:
# . prologue
55/push-ebp
89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
# setup
# . *Trace-stream->write = 0
8b/copy 0/mod/indirect 5/rm32/.disp32 . . 0/r32/eax Trace-stream/disp32 # copy *Trace-stream to eax
c7 0/subop/copy 0/mod/direct 0/rm32/eax . . . . . 0/imm32 # clear *eax
# (eax..ecx) = "b"
b8/copy-to-eax "b"/imm32
8b/copy 0/mod/indirect 0/rm32/eax . . . 1/r32/ecx . . # copy *eax to ecx
8d/copy-address 1/mod/*+disp8 4/rm32/sib 0/base/eax 1/index/ecx . 1/r32/ecx 4/disp8 . # copy eax+ecx+4 to ecx
05/add-to-eax 4/imm32
# var b/ebx: slice = {eax, ecx}
51/push-ecx
50/push-eax
89/copy 3/mod/direct 3/rm32/ebx . . . 4/r32/esp . . # copy esp to ebx
# trace-slsls("A" b "c " 3 " e")
# . . push args
68/push " e"/imm32
68/push 3/imm32
68/push "c "/imm32
53/push-ebx
68/push "A"/imm32
# . . call
e8/call trace-slsns/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0x14/imm32 # add to esp
#? # dump *Trace-stream {{{
#? # . write(2/stderr, "^")
#? # . . push args
#? 68/push "^"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . write-stream(2/stderr, *Trace-stream)
#? # . . push args
#? ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write-stream/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . write(2/stderr, "$\n")
#? # . . push args
#? 68/push "$\n"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # }}}
# check-trace-contains("Abc 0x00000003 e")
# . . push args
68/push "F - test-trace-slsls"/imm32
68/push "Abc 0x00000003 e"/imm32
# . . call
e8/call check-trace-contains/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . epilogue
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
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