92 lines
5.6 KiB
Plaintext
92 lines
5.6 KiB
Plaintext
# Print an error message followed by the text representation of a byte. Then exit.
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== 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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#? Entry: # manual test
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#? # . var ed/EAX : exit-descriptor
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#? 81 5/subop/subtract 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # subtract from ESP
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#? 89/copy 3/mod/direct 0/rm32/EAX . . . 4/r32/ESP . . # copy ESP to EAX
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#? # . configure ed to really exit()
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#? # . . ed->target = 0
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#? c7 0/subop/copy 0/mod/direct 0/rm32/EAX . . . . . 0/imm32 # copy to *EAX
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#? # . error-byte(ed, Stdout, msg, 34)
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#? 68/push 0x34/imm32
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#? 68/push "abc"/imm32
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#? 68/push Stderr/imm32
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#? 50/push-EAX
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#? e8/call error-byte/disp32
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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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# write(out, "Error: "+msg+": "+byte) then stop(ed, 1)
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error-byte: # ed : (address exit-descriptor), out : (address buffered-file), msg : (address array byte), n : byte -> <void>
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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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# write-buffered(out, "Error: ")
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# . . push args
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68/push "Error: "/imm32
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ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0xc/disp8 . # push *(EBP+12)
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# . . call
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e8/call write-buffered/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-buffered(out, msg)
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# . . push args
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ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0x10/disp8 . # push *(EBP+16)
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ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0xc/disp8 . # push *(EBP+12)
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# . . call
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e8/call write-buffered/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-buffered(out, ": ")
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# . . push args
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68/push ": "/imm32
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ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0xc/disp8 . # push *(EBP+12)
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# . . call
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e8/call write-buffered/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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# print-byte-buffered(out, byte)
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# . . push args
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ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0x14/disp8 . # push *(EBP+20)
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ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0xc/disp8 . # push *(EBP+12)
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# . . call
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e8/call print-byte-buffered/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-buffered(out, Newline)
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# . . push args
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68/push Newline/imm32
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ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0xc/disp8 . # push *(EBP+12)
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# . . call
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e8/call write-buffered/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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# . flush(out)
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# . . push args
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ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0xc/disp8 . # push *(EBP+12)
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# . . call
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e8/call flush/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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# stop(ed, 1)
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# . . push args
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68/push 1/imm32
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ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 8/disp8 . # push *(EBP+8)
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# . . call
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e8/call stop/disp32
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# should never get past this point
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$error-byte:dead-end:
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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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# . . vim:nowrap:textwidth=0
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