From 5a2cb154eb016aa8b84ad939f63eb56dd7a0a90f Mon Sep 17 00:00:00 2001 From: Kartik Agaram Date: Tue, 2 Oct 2018 01:21:01 -0700 Subject: 4649 --- html/subx/examples/ex8.subx.html | 32 ++++++++++++++++---------------- 1 file changed, 16 insertions(+), 16 deletions(-) (limited to 'html/subx/examples/ex8.subx.html') diff --git a/html/subx/examples/ex8.subx.html b/html/subx/examples/ex8.subx.html index 65f5e09c..abb09b84 100644 --- a/html/subx/examples/ex8.subx.html +++ b/html/subx/examples/ex8.subx.html @@ -56,9 +56,9 @@ if ('onhashchange' in window) { 
  1 ## Example reading commandline arguments: compute length of first arg.
  2 #
- 3 # To run:
- 4 #   $ subx translate ex8.subx ex8
- 5 #   $ subx run ex8 abc de fghi
+ 3 # To run (from the subx directory):
+ 4 #   $ subx translate examples/ex8.subx -o examples/ex8
+ 5 #   $ subx run examples/ex8 abc de fghi
  6 # Expected result:
  7 #   $ echo $?
  8 #   3  # length of 'abc'
@@ -74,36 +74,36 @@ if ('onhashchange' in window) {
 18 # instruction                     effective address                                                   operand     displacement    immediate
 19 # op          subop               mod             rm32          base        index         scale       r32
 20 # 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
-21   # var s = argv[1] (EBX)
-22   8b/copy                         1/mod/*+disp8   4/rm32/sib    4/base/ESP  4/index/none              3/r32/EBX   8/disp8         .                       # copy *(ESP+8) to EBX
-23   # call ascii_length(EBX)
+21   # prolog
+22   89/copy                         3/mod/direct    5/rm32/EBP    .           .             .           4/r32/ESP   .               .                 # copy ESP to EBP
+23   # call ascii_length(argv[1])
 24     # push args
-25   53/push-EBX
+25   ff          6/subop/push        1/mod/*+disp8   4/rm32/sib    5/base/EBP  4/index/none  .           .           0x8/disp8       .                 # push *(EBP+8)
 26     # call
 27   e8/call  ascii_length/disp32
 28     # discard args
-29   81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32                 # add 4 to ESP
+29   81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
 30 
 31   # exit(EAX)
-32   89/copy                         3/mod/direct    3/rm32/EBX    .           .             .           0/r32/EAX   .               .                       # copy EAX to EBX
-33   b8/copy                         .               .             .           .             .           .           .               1/imm32/exit            # copy 1 to EAX
+32   89/copy                         3/mod/direct    3/rm32/EBX    .           .             .           0/r32/EAX   .               .                 # copy EAX to EBX
+33   b8/copy                         .               .             .           .             .           .           .               1/imm32/exit      # copy to EAX
 34   cd/syscall  0x80/imm8
 35 
 36 ascii_length:  # (s)
 37   # initialize s (EDX)
-38   8b/copy                         1/mod/*+disp8   4/rm32/sib    4/base/ESP  4/index/none              2/r32/EDX   4/disp8                                 # copy *(ESP+4) to EDX
+38   8b/copy                         1/mod/*+disp8   4/rm32/sib    4/base/ESP  4/index/none              2/r32/EDX   4/disp8                           # copy *(ESP+4) to EDX
 39   # var result = 0 (EAX)
-40   b8/copy                         .               .             .           .             .           .           .               0/imm32                 # copy 0 to EAX
+40   b8/copy                         .               .             .           .             .           .           .               0/imm32           # copy to EAX
 41 $ascii_length_loop:
 42   # var c = *s (ECX)
-43   8a/copy                         0/mod/*         2/rm32/EDX    .           .             .           1/r32/ECX   .               .                       # copy byte at *EDX to lower byte of ECX
+43   8a/copy                         0/mod/*         2/rm32/EDX    .           .             .           1/r32/ECX   .               .                 # copy byte at *EDX to lower byte of ECX
 44   # if c == '\0' break
-45   81          7/subop/compare     3/mod/direct    1/rm32/ECX    .           .             .           .           .               0/imm32                 # compare ECX with 0
+45   81          7/subop/compare     3/mod/direct    1/rm32/ECX    .           .             .           .           .               0/imm32           # compare ECX
 46   74/jump-if-equal  $ascii_length_ret/disp8
 47   # ++s
-48   81          0/subop/add         3/mod/direct    2/rm32/EDX    .           .             .           .           .               1/imm32                 # add 1 to EDX
+48   81          0/subop/add         3/mod/direct    2/rm32/EDX    .           .             .           .           .               1/imm32           # add to EDX
 49   # ++result
-50   81          0/subop/add         3/mod/direct    0/rm32/EAX    .           .             .           .           .               1/imm32                 # add 1 to EAX
+50   40/inc-EAX
 51   # loop
 52   eb/jump  $ascii_length_loop/disp8
 53 $ascii_length_ret:
-- 
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