313 lines
15 KiB
Plaintext
313 lines
15 KiB
Plaintext
== code
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# instruction effective address register displacement immediate
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# . op subop mod rm32 base index scale r32
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# . 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
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# main:
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e8/call run-tests/disp32 # 'run-tests' is a function created automatically by SubX. It calls all functions that start with 'test-'.
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# syscall(exit, Num-test-failures)
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8b/copy 0/mod/indirect 5/rm32/.disp32 . . 3/r32/EBX Num-test-failures/disp32 # copy *Num-test-failures to EBX
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b8/copy-to-EAX 1/imm32/exit
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cd/syscall 0x80/imm8
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# read bytes from 'f' until (and including) a newline and store them into 's'
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# return true if no data found, false otherwise
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# just abort if 's' is too small
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read-line: # f : (address buffered-file), s : (address stream byte) -> eof?/EAX
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# pseudocode:
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# loop:
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# if (s->write >= s->length) abort
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# if (f->read >= f->write) populate stream from file
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# if (f->write == 0) break
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# AL = f->data[f->read]
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# s->data[s->write] = AL
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# ++f->read
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# ++s->write
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# if AL == '\n' break
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# . prolog
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55/push-EBP
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89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP
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# . save registers
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51/push-ECX
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52/push-EDX
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56/push-ESI
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57/push-EDI
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# ESI = f
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8b/copy 1/mod/*+disp8 5/rm32/EBP . . . 6/r32/ESI 8/disp8 . # copy *(EBP+8) to ESI
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# ECX = f->read
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8b/copy 1/mod/*+disp8 6/rm32/ESI . . . 1/r32/ECX 8/disp8 . # copy *(ESI+8) to ECX
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# EDI = s
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8b/copy 1/mod/*+disp8 5/rm32/EBP . . . 7/r32/EDI 0xc/disp8 . # copy *(EBP+12) to EDI
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# EDX = s->write
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8b/copy 0/mod/indirect 7/rm32/EDI . . . 2/r32/EDX . . # copy *EDI to EDX
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$read-line:loop:
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# if (s->write >= s->length) abort
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3b/compare 1/mod/*+disp8 7/rm32/EDI . . . 2/r32/EDX 8/disp8 . # compare EDX with *(EDI+8)
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7d/jump-if-greater-or-equal $read-line:abort/disp8
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# if (f->read >= f->write) populate stream from file
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3b/compare 1/mod/*+disp8 6/rm32/ESI . . . 1/r32/ECX 4/disp8 . # compare ECX with *(ESI+4)
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7c/jump-if-lesser $read-line:from-stream/disp8
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# . clear-stream(stream = f+4)
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# . . push args
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8d/copy-address 1/mod/*+disp8 6/rm32/ESI . . . 0/r32/EAX 4/disp8 . # copy ESI+4 to EAX
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50/push-EAX
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# . . call
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e8/call clear-stream/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
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# . f->read must now be 0; update its cache at ECX
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31/xor 3/mod/direct 1/rm32/ECX . . . 1/r32/ECX . . # clear ECX
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# . EAX = read(f->fd, stream = f+4)
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# . . push args
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50/push-EAX
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ff 6/subop/push 0/mod/indirect 6/rm32/ESI . . . . . . # push *ESI
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# . . call
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e8/call read/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
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# if f->write == 0 return true
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# . if EAX == 0 return true
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81 7/subop/compare 3/mod/direct 0/rm32/EAX . . . . . 0/imm32 # compare EAX
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75/jump-if-not-equal $read-line:from-stream/disp8
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b8/copy-to-EAX 0xffffffff/imm32
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eb/jump $read-line:end/disp8
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$read-line:from-stream:
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# AL = f->data[f->read]
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31/xor 3/mod/direct 0/rm32/EAX . . . 0/r32/EAX . . # clear EAX
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8a/copy-byte 1/mod/*+disp8 4/rm32/sib 6/base/ESI 1/index/ECX . 0/r32/AL 0x10/disp8 . # copy byte at *(ESI+ECX+16) to AL
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# s->data[s->write] = AL
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88/copy-byte 1/mod/*+disp8 4/rm32/sib 7/base/EDI 2/index/EDX . 0/r32/AL 0xc/disp8 . # copy AL to *(EDI+EDX+12)
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# ++f->read
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41/increment-ECX
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# ++s->write
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42/increment-EDX
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# if AL == '\n' return false
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81 7/subop/compare 3/mod/direct 0/rm32/EAX . . . . . 0xa/imm32 # compare EAX
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75/jump-if-not-equal $read-line:loop/disp8
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31/xor 3/mod/direct 0/rm32/EAX . . . 0/r32/EAX . . # clear EAX
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$read-line:end:
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# save f->read
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89/copy 1/mod/*+disp8 6/rm32/ESI . . . 1/r32/ECX 8/disp8 . # copy ECX to *(ESI+8)
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# save s->write
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89/copy 0/mod/indirect 7/rm32/EDI . . . 2/r32/EDX . . # copy EDX to *EDI
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# . restore registers
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5f/pop-to-EDI
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5e/pop-to-ESI
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5a/pop-to-EDX
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59/pop-to-ECX
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# . epilog
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89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP
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5d/pop-to-EBP
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c3/return
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$read-line:abort:
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# . _write(2/stderr, error)
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# . . push args
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68/push "read-line: line too long"/imm32
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68/push 2/imm32/stderr
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# . . call
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e8/call _write/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
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# . syscall(exit, 1)
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bb/copy-to-EBX 1/imm32
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b8/copy-to-EAX 1/imm32/exit
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cd/syscall 0x80/imm8
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# never gets here
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test-read-line:
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# - check that read-line stops at a newline
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# setup
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# . clear-stream(_test-stream)
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# . . push args
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68/push _test-stream/imm32
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# . . call
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e8/call clear-stream/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
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# . clear-stream(_test-buffered-file+4)
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# . . push args
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b8/copy-to-EAX _test-buffered-file/imm32
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05/add-to-EAX 4/imm32
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50/push-EAX
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# . . call
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e8/call clear-stream/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
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# . clear-stream(_test-stream-buffer)
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# . . push args
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68/push _test-stream-buffer/imm32
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# . . call
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e8/call clear-stream/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
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# write(_test-stream, "ab\ncd")
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# . write(_test-stream, "ab")
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# . . push args
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68/push "ab"/imm32
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68/push _test-stream/imm32
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# . . call
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e8/call write/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
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# . write(_test-stream, "\n")
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# . . push args
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68/push Newline/imm32
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68/push _test-stream/imm32
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# . . call
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e8/call write/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
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# . write(_test-stream, "cd")
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# . . push args
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68/push "cd"/imm32
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68/push _test-stream/imm32
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# . . call
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e8/call write/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
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# read a line from _test-stream (buffered by _test-buffered-file) into _test-stream-buffer
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# . EAX = read-line(_test-buffered-file, _test-stream-buffer)
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# . . push args
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68/push _test-stream-buffer/imm32
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68/push _test-buffered-file/imm32
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# . . call
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e8/call read-line/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
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# check-ints-equal(EAX, 0/not-at-eof, msg)
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# . . push args
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68/push "F - test-read-line: return value"/imm32
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68/push 0/imm32/not-at-eof
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50/push-EAX
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# . . call
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e8/call check-ints-equal/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
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# check-ints-equal(*_test-stream-buffer->data, 61/a 62/b 0a/newline 00, msg)
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# . . push args
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68/push "F - test-read-line"/imm32
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68/push 0x000a6261/imm32
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# . . push *_test-stream->data
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b8/copy-to-EAX _test-stream-buffer/imm32
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ff 6/subop/push 1/mod/*+disp8 0/rm32/EAX . . . . 0xc/disp8 . # push *(EAX+12)
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# . . call
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e8/call check-ints-equal/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
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# end
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c3/return
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test-read-line-returns-true-on-eof:
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# setup
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# . clear-stream(_test-stream)
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# . . push args
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68/push _test-stream/imm32
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# . . call
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e8/call clear-stream/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
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# . clear-stream(_test-buffered-file+4)
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# . . push args
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b8/copy-to-EAX _test-buffered-file/imm32
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05/add-to-EAX 4/imm32
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50/push-EAX
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# . . call
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e8/call clear-stream/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
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# . clear-stream(_test-stream-buffer)
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# . . push args
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68/push _test-stream-buffer/imm32
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# . . call
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e8/call clear-stream/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
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# write nothing
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# EAX = read-line(_test-buffered-file, _test-stream-buffer)
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# . . push args
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68/push _test-stream-buffer/imm32
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68/push _test-buffered-file/imm32
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# . . call
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e8/call read-line/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
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# check-ints-equal(EAX, eof, msg)
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# . . push args
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68/push "F - test-read-line-returns-true-on-eof"/imm32
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68/push 0xffffffff/imm32/not-at-eof
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50/push-EAX
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# . . call
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e8/call check-ints-equal/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
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# end
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c3/return
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test-read-line-reads-final-line-until-eof:
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# setup
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# . clear-stream(_test-stream)
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# . . push args
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68/push _test-stream/imm32
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# . . call
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e8/call clear-stream/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
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# . clear-stream(_test-buffered-file+4)
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# . . push args
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b8/copy-to-EAX _test-buffered-file/imm32
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05/add-to-EAX 4/imm32
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50/push-EAX
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# . . call
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e8/call clear-stream/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
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# . clear-stream(_test-stream-buffer)
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# . . push args
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68/push _test-stream-buffer/imm32
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# . . call
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e8/call clear-stream/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
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# write(_test-stream, "cd")
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# . . push args
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68/push "cd"/imm32
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68/push _test-stream/imm32
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# . . call
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e8/call write/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
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# read a line from _test-stream (buffered by _test-buffered-file) into _test-stream-buffer
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# . EAX = read-line(_test-buffered-file, _test-stream-buffer)
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# . . push args
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68/push _test-stream-buffer/imm32
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68/push _test-buffered-file/imm32
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# . . call
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e8/call read-line/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
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# check-ints-equal(EAX, eof, msg)
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# . . push args
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68/push "F - test-read-line-reads-final-line-until-eof: return value"/imm32
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68/push 0xffffffff/imm32/not-at-eof
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50/push-EAX
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# . . call
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e8/call check-ints-equal/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
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# check-ints-equal(*_test-stream-buffer->data, 63/c 64/d 00 00, msg)
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# . . push args
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68/push "F - test-read-line-reads-final-line-until-eof"/imm32
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68/push 0x00006463/imm32
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# . . push *_test-stream->data
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b8/copy-to-EAX _test-stream-buffer/imm32
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ff 6/subop/push 1/mod/*+disp8 0/rm32/EAX . . . . 0xc/disp8 . # push *(EAX+12)
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# . . call
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e8/call check-ints-equal/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
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# end
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c3/return
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# . . vim:nowrap:textwidth=0
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