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This commit is contained in:
Kartik Agaram 2018-09-20 16:11:39 -07:00
parent 440a7be400
commit d783d42cf8
2 changed files with 58 additions and 10 deletions
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subx/apps/crenshaw2-1
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68
subx/apps/crenshaw2-1.subx
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@ -16,11 +16,11 @@
# 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:
# error(Error_integer)
# abort(Error_integer)
# push args
68/push . . . . . . . Error_integer/imm32 # push 5
68/push . . . . . . . Error_integer/imm32
# call
e8/call . . . . . . error/disp32
e8/call . . . . . . abort/disp32
# discard arg
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add 4 to ESP
# exit(0)
@ -28,10 +28,50 @@
b8/copy . . . . . . . 1/imm32/exit # copy 1 to EAX
cd/syscall . . . . . . . 0x80/imm8 # int 80h
# print error message and exit(1)
abort: # s : (address array byte) -> <void>
# error(s)
# push args
ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none . . 4/disp8 . # push *(ESP+4)
# call
e8/call . . . . . . error/disp32
# discard arg
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add 4 to ESP
# exit(1)
bb/copy . . . . . . . 1/imm32 # copy 1 to EBX
b8/copy . . . . . . . 1/imm32/exit # copy 1 to EAX
cd/syscall . . . . . . . 0x80/imm8 # int 80h
# print out "Error: #{s}\n" to stderr
error: # s : (address array byte) -> <void>
# write_stderr(Error)
# push args
68/push . . . . . . . Error/imm32
# call
e8/call . . . . . . write_stderr/disp32
# discard arg
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add 4 to ESP
# write_stderr(s)
# push args
ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none . . 4/disp8 . # push *(ESP+4)
# call
e8/call . . . . . . write_stderr/disp32
# discard arg
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add 4 to ESP
# write_stderr(Newline)
# push args
68/push . . . . . . . Newline/imm32
# call
e8/call . . . . . . write_stderr/disp32
# discard arg
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add 4 to ESP
# end
c3/return
write_stderr: # s : (address array byte) -> <void>
# write(2/stderr, (data) s+4, (size) *s)
# fd = 2 (stderr)
bb/copy . . . . . . . 1/imm32 # copy 2 to EBX
bb/copy . . . . . . . 2/imm32 # copy 2 to EBX
# x = s+4
8b/copy 1/mod/*+disp8 4/rm32/SIB 4/base/ESP 4/index/none . 1/r32/ECX 4/disp8 . # copy *(ESP+4) to ECX
81 0/subop/add 3/mod/direct 1/rm32/ECX . . . . . 4/imm32 # add 4 to ECX
@ -41,14 +81,22 @@ error: # s : (address array byte) -> <void>
# call write()
b8/copy . . . . . . . 4/imm32/write # copy 1 to EAX
cd/syscall . . . . . . . 0x80/imm8 # int 80h
# exit(1)
bb/copy . . . . . . . 1/imm32 # copy 1 to EBX
b8/copy . . . . . . . 1/imm32/exit # copy 1 to EAX
cd/syscall . . . . . . . 0x80/imm8 # int 80h
# end
c3/return
== data
Newline:
# size
01 00 00 00
# data
0a/newline
Error: # "Error: " : (array byte)
# size
07 00 00 00
# data
45/E 72/r 72/r 6f/o 72/r 3a/: 20/space
Error_integer: # "Integer" : (array byte)
# size
08 00 00 00
07 00 00 00
# data
49 6e 74 65 67 65 72 10
49/I 6e/n 74/t 65/e 67/g 65/e 72/r