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| author | Kartik Agaram <vc@akkartik.com> | 2019-02-02 22:05:11 -0800 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2019-02-02 22:05:11 -0800 |
| commit | 03c6f1d3858ff0fdb6af6ce4b61bea51f16b33be (patch) | |
| tree | 2dfceaa7676f03f09dc3585030b56cdea834483d /subx/066error-byte.subx | |
| parent | cb82bd2364c302acbb96dd6900779e189b36efac (diff) | |
| download | mu-03c6f1d3858ff0fdb6af6ce4b61bea51f16b33be.tar.gz | |
4949
Diffstat (limited to 'subx/066error-byte.subx')
| -rw-r--r-- | subx/066error-byte.subx | 112 |
1 files changed, 0 insertions, 112 deletions
diff --git a/subx/066error-byte.subx b/subx/066error-byte.subx deleted file mode 100644 index 5f9a4ada..00000000 --- a/subx/066error-byte.subx +++ /dev/null @@ -1,112 +0,0 @@ -# Print an error message followed by the text representation of a byte. Then exit. - -== 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 - -# main: - # manual test -#? # . var ed/EAX : exit-descriptor -#? 81 5/subop/subtract 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # subtract from ESP -#? 89/copy 3/mod/direct 0/rm32/EAX . . . 4/r32/ESP . . # copy ESP to EAX -#? # . configure ed to really exit() -#? # . . ed->target = 0 -#? c7 0/subop/copy 0/mod/direct 0/rm32/EAX . . . . . 0/imm32 # copy to *EAX -#? # . error-byte(ed, Stdout, msg, 34) -#? 68/push 0x34/imm32 -#? 68/push "abc"/imm32 -#? 68/push Stderr/imm32 -#? 50/push-EAX -#? e8/call error-byte/disp32 - # automatic test - e8/call run-tests/disp32 # 'run-tests' is a function created automatically by SubX. It calls all functions that start with 'test-'. - # . 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 - b8/copy-to-EAX 1/imm32/exit - cd/syscall 0x80/imm8 - -# write(out, "Error: "+msg+": "+byte) then stop(ed, 1) -error-byte: # ed : (address exit-descriptor), out : (address buffered-file), msg : (address array byte), n : byte -> <void> - # . prolog - 55/push-EBP - 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP - # write-buffered(out, "Error: ") - # . . push args - 68/push "Error: "/imm32 - ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0xc/disp8 . # push *(EBP+12) - # . . 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, msg) - # . . push args - ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0x10/disp8 . # push *(EBP+16) - ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0xc/disp8 . # push *(EBP+12) - # . . 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 ": "/imm32 - ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0xc/disp8 . # push *(EBP+12) - # . . call - e8/call write-buffered/disp32 - # . . discard args - 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP - # print-byte(out, byte) - # . . push args - ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0x14/disp8 . # push *(EBP+20) - ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0xc/disp8 . # push *(EBP+12) - # . . call - e8/call print-byte/disp32 - # . . discard args - 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP - # write-buffered(out, Newline) - # . . push args - 68/push Newline/imm32 - ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0xc/disp8 . # push *(EBP+12) - # . . call - e8/call write-buffered/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 - # stop(ed, 1) - # . . push args - 68/push 1/imm32 - ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 8/disp8 . # push *(EBP+8) - # . . call - e8/call stop/disp32 - # should never get past this point -$error-byte:dead-end: - # . epilog - 89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP - 5d/pop-to-EBP - c3/return - -== data - -# The buffered file for standard error. -Stderr: - # file descriptor or (address stream) - 02 00 00 00 # 1 = standard error - # current write index - 00 00 00 00 - # current read index - 00 00 00 00 - # length (8) - 08 00 00 00 - # data - 00 00 00 00 00 00 00 00 # 8 bytes - -# TODO: 8 bytes is too small. We'll need to grow the buffer for efficiency. But -# I don't want to type in 1024 bytes here. - -# . . vim:nowrap:textwidth=0 |