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Yet another step in the slow divergence of survey_baremetal from its survey_elf
roots.
This commit is contained in:
Kartik K. Agaram 2021-05-09 13:21:08 -07:00
parent 1b9ddcefb9
commit cd6412129f
2 changed files with 31 additions and 31 deletions
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linux/survey_baremetal.subx
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@ -111,7 +111,7 @@ subx-survey: # infile: (addr buffered-file), out: (addr buffered-file)
# var in: (stream byte Input-size)
# slurp(infile, in)
# var labels: (stream {label-name, address} Max-labels)
# compute-offsets(in, labels)
# compute-addresses(in, labels)
# rewind-stream(in)
# emit-output(in, out, labels)
#
@ -151,12 +151,12 @@ subx-survey: # infile: (addr buffered-file), out: (addr buffered-file)
e8/call slurp/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# compute-offsets(in, labels)
# compute-addresses(in, labels)
# . . push args
52/push-edx
56/push-esi
# . . call
e8/call compute-offsets/disp32
e8/call compute-addresses/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# rewind-stream(in)
@ -459,7 +459,7 @@ test-subx-survey-computes-addresses-with-padding:
5d/pop-to-ebp
c3/return
compute-offsets: # in: (addr stream byte), labels: (addr stream {(handle array byte), address})
compute-addresses: # in: (addr stream byte), labels: (addr stream {(handle array byte), address})
# pseudocode:
# var current-address = 0x7c00
# var line: (stream byte 512)
@ -514,7 +514,7 @@ compute-offsets: # in: (addr stream byte), labels: (addr stream {(handle array
68/push 0/imm32
68/push 0/imm32
89/copy 3/mod/direct 2/rm32/edx . . . 4/r32/esp . . # copy esp to edx
$compute-offsets:line-loop:
$compute-addresses:line-loop:
# clear-stream(line)
# . . push args
51/push-ecx
@ -533,7 +533,7 @@ $compute-offsets:line-loop:
# 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-offsets:end/disp32
0f 84/jump-if-= $compute-addresses:end/disp32
#? # dump line {{{
#? # . write(2/stderr, "LL: ")
#? # . . push args
@ -567,7 +567,7 @@ $compute-offsets:line-loop:
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
#? # }}}
$compute-offsets:word-loop:
$compute-addresses:word-loop:
# next-word(line, word-slice)
# . . push args
52/push-edx
@ -576,7 +576,7 @@ $compute-offsets:word-loop:
e8/call next-word/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
$compute-offsets:case-empty:
$compute-addresses:case-empty:
# if slice-empty?(word-slice) break
# . eax = slice-empty?(word-slice)
# . . push args
@ -587,8 +587,8 @@ $compute-offsets:case-empty:
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-offsets:line-loop/disp32
$compute-offsets:case-comment:
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
@ -599,8 +599,8 @@ $compute-offsets:case-comment:
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-offsets:line-loop/disp32
$compute-offsets:case-segment-header:
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
@ -612,7 +612,7 @@ $compute-offsets:case-segment-header:
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-offsets:case-label/disp32
0f 84/jump-if-= $compute-addresses:case-label/disp32
# next-word(line, word-slice)
# . . push args
52/push-edx
@ -631,7 +631,7 @@ $compute-offsets:case-segment-header:
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-offsets:abort/disp32
0f 85/jump-if-!= $compute-addresses:abort/disp32
# next-word(line, word-slice)
# . . push args
52/push-edx
@ -650,7 +650,7 @@ $compute-offsets:case-segment-header:
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-offsets:line-loop/disp32
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
@ -660,12 +660,12 @@ $compute-offsets:case-segment-header:
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-offsets:error-bad-segment-address/disp32
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-offsets:line-loop/disp32
$compute-offsets:case-label:
e9/jump $compute-addresses:line-loop/disp32
$compute-addresses:case-label:
# if (!label?(word-slice)) goto next case
# . eax = label?(word-slice)
# . . push args
@ -676,7 +676,7 @@ $compute-offsets:case-label:
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-offsets:case-default/disp32
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) = get-or-insert-slice(labels, word-slice, row-size=12)
@ -703,8 +703,8 @@ $compute-offsets:case-label:
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0x14/imm32 # add to esp
# continue
e9/jump $compute-offsets:word-loop/disp32
$compute-offsets:case-default:
e9/jump $compute-addresses:word-loop/disp32
$compute-addresses:case-default:
# width/eax = compute-width-of-slice(word-slice)
# . . push args
52/push-edx
@ -733,7 +733,7 @@ $compute-offsets:case-default:
#? # . write-int32-hex-buffered(Stderr, segment-offset)
#? # . . push args
#? 52/push-edx
#? ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . compute-offsets:segment-offset/disp32 # push *segment-offset
#? 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
@ -755,8 +755,8 @@ $compute-offsets:case-default:
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # }}}
e9/jump $compute-offsets:word-loop/disp32
$compute-offsets:end:
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
@ -771,7 +771,7 @@ $compute-offsets:end:
5d/pop-to-ebp
c3/return
$compute-offsets:abort:
$compute-addresses:abort:
# . _write(2/stderr, error)
# . . push args
68/push "'==' must be followed by segment name and optionally an address\n"/imm32
@ -785,7 +785,7 @@ $compute-offsets:abort:
e8/call syscall_exit/disp32
# never gets here
$compute-offsets:error-bad-segment-address:
$compute-addresses:error-bad-segment-address:
# . _write(2/stderr, error)
# . . push args
68/push "'==' specifies an address that implies negative padding\n"/imm32
@ -799,7 +799,7 @@ $compute-offsets:error-bad-segment-address:
e8/call syscall_exit/disp32
# never gets here
test-compute-offsets:
test-compute-addresses:
# input:
# == code
# ab x/imm32 # skip comment
@ -877,12 +877,12 @@ test-compute-offsets:
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# compute-offsets(_test-input-stream, labels)
# compute-addresses(_test-input-stream, labels)
# . . push args
52/push-edx
68/push _test-input-stream/imm32
# . . call
e8/call compute-offsets/disp32
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 {{{
@ -913,7 +913,7 @@ test-compute-offsets:
#? # }}}
# . check-trace-contains("label 'x' is at address 0x00007c06.", msg)
# . . push args
68/push "F - test-compute-offsets"/imm32
68/push "F - test-compute-addresses"/imm32
68/push "label 'x' is at address 0x00007c06."/imm32
# . . call
e8/call check-trace-contains/disp32
@ -921,7 +921,7 @@ test-compute-offsets:
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-offsets-maintains-labels-write-index"/imm32
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