diff options
Diffstat (limited to 'subx/examples/ex5.subx')
| -rw-r--r-- | subx/examples/ex5.subx | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/subx/examples/ex5.subx b/subx/examples/ex5.subx index 136c177b..5028568c 100644 --- a/subx/examples/ex5.subx +++ b/subx/examples/ex5.subx @@ -1,4 +1,4 @@ -## read a character from stdin, save it to a local on the stack, write it to stdout +# Read a character from stdin, save it to a local on the stack, write it to stdout. # # To run (from the subx directory): # $ subx translate examples/ex5.subx -o examples/ex5 @@ -14,24 +14,24 @@ 81 5/subop/subtract 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # subtract from ESP # syscall(read, stdin, x, 1) - # fd = 0 (stdin) + # . fd = 0 (stdin) bb/copy-to-EBX 0/imm32 - # initialize x (location to write result to) + # . data = x (location to write result to) 8d/copy-address 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none 1/r32/ECX 4/disp8 . # copy ESP+4 to ECX - # size = 1 character + # . size = 1 character ba/copy-to-EDX 1/imm32 - # syscall + # . syscall b8/copy-to-EAX 3/imm32/read cd/syscall 0x80/imm8 # syscall(write, stdout, x, 1) - # fd = 1 (stdout) + # . fd = 1 (stdout) bb/copy-to-EBX 1/imm32 - # initialize x (location to read from) + # . data = x (location to read from) 8d/copy-address 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none 1/r32/ECX 4/disp8 . # copy ESP+4 to ECX - # size = 1 character + # . size = 1 character ba/copy-to-EDX 1/imm32 - # syscall + # . syscall b8/copy-to-EAX 4/imm32/write cd/syscall 0x80/imm8 |