diff options
Diffstat (limited to 'subx/examples/ex11.subx')
| -rw-r--r-- | subx/examples/ex11.subx | 38 |
1 files changed, 19 insertions, 19 deletions
diff --git a/subx/examples/ex11.subx b/subx/examples/ex11.subx index 253b91ab..e2628c39 100644 --- a/subx/examples/ex11.subx +++ b/subx/examples/ex11.subx @@ -1,4 +1,4 @@ -## Null-terminated vs length-prefixed ascii strings. +# Null-terminated vs length-prefixed ascii strings. # # By default we create strings with a 4-byte length prefix rather than a null suffix. # However we still need null-prefixed strings when interacting with the Linux @@ -108,7 +108,7 @@ $kernel-string-equal:end: 5d/pop-to-EBP c3/return -## tests +# - tests test-compare-null-kernel-string-with-empty-array: # EAX = kernel-string-equal(Null-kernel-string, "") @@ -119,7 +119,7 @@ test-compare-null-kernel-string-with-empty-array: e8/call kernel-string-equal/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP - # . . call check-ints-equal(EAX, 1, msg) + # check-ints-equal(EAX, 1, msg) # . . push args 68/push "F - test-compare-null-kernel-string-with-empty-array"/imm32 68/push 1/imm32/true @@ -139,7 +139,7 @@ test-compare-null-kernel-string-with-non-empty-array: e8/call kernel-string-equal/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP - # . . call check-ints-equal(EAX, 0, msg) + # check-ints-equal(EAX, 0, msg) # . . push args 68/push "F - test-compare-null-kernel-string-with-non-empty-array"/imm32 68/push 0/imm32/false @@ -159,7 +159,7 @@ test-compare-kernel-string-with-equal-array: e8/call kernel-string-equal/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP - # . . call check-ints-equal(EAX, 1, msg) + # check-ints-equal(EAX, 1, msg) # . . push args 68/push "F - test-compare-kernel-string-with-equal-array"/imm32 68/push 1/imm32/true @@ -179,7 +179,7 @@ test-compare-kernel-string-with-inequal-array: e8/call kernel-string-equal/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP - # . . call check-ints-equal(EAX, 0, msg) + # check-ints-equal(EAX, 0, msg) # . . push args 68/push "F - test-compare-kernel-string-with-equal-array"/imm32 68/push 0/imm32/false @@ -199,7 +199,7 @@ test-compare-kernel-string-with-empty-array: e8/call kernel-string-equal/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP - # . . call check-ints-equal(EAX, 0) + # check-ints-equal(EAX, 0) # . . push args 68/push "F - test-compare-kernel-string-with-equal-array"/imm32 68/push 0/imm32/false @@ -219,7 +219,7 @@ test-compare-kernel-string-with-shorter-array: e8/call kernel-string-equal/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP - # . . call check-ints-equal(EAX, 0) + # check-ints-equal(EAX, 0) # . . push args 68/push "F - test-compare-kernel-string-with-shorter-array"/imm32 68/push 0/imm32/false @@ -239,7 +239,7 @@ test-compare-kernel-string-with-longer-array: e8/call kernel-string-equal/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP - # . . call check-ints-equal(EAX, 0) + # check-ints-equal(EAX, 0) # . . push args 68/push "F - test-compare-kernel-string-with-longer-array"/imm32 68/push 0/imm32/false @@ -250,7 +250,7 @@ test-compare-kernel-string-with-longer-array: 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP c3/return -## helpers +# - helpers # print msg to stderr if a != b, otherwise print "." check-ints-equal: # (a : int, b : int, msg : (address array byte)) -> boolean @@ -263,19 +263,19 @@ check-ints-equal: # (a : int, b : int, msg : (address array byte)) -> boolean # load args into EAX, EBX and ECX 8b/copy 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none . 0/r32/EAX 0x8/disp8 . # copy *(EBP+8) to EAX 8b/copy 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none . 3/r32/EBX 0xc/disp8 . # copy *(EBP+12) to EBX - # if EAX == b/EBX + # if EAX == b/EBX print('.') and return 39/compare 3/mod/direct 0/rm32/EAX . . . 3/r32/EBX . . # compare EAX and EBX 75/jump-if-unequal $check-ints-equal:else/disp8 - # print('.') + # . write-stderr('.') # . . push args 68/push "."/imm32 # . . call e8/call write-stderr/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP - # return + # . return eb/jump $check-ints-equal:end/disp8 - # else: + # otherwise print(msg) $check-ints-equal:else: # copy msg into ECX 8b/copy 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none . 1/r32/ECX 0x10/disp8 . # copy *(EBP+16) to ECX @@ -312,15 +312,15 @@ write-stderr: # s : (address array byte) -> <void> 52/push-EDX 53/push-EBX # syscall(write, 2/stderr, (data) s+4, (size) *s) - # fd = 2 (stderr) + # . . fd = 2 (stderr) bb/copy-to-EBX 2/imm32 - # x = s+4 + # . . x = s+4 8b/copy 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none . 1/r32/ECX 8/disp8 . # copy *(EBP+8) to ECX 81 0/subop/add 3/mod/direct 1/rm32/ECX . . . . . 4/imm32 # add to ECX - # size = *s + # . . size = *s 8b/copy 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none . 2/r32/EDX 8/disp8 . # copy *(EBP+8) to EDX 8b/copy 0/mod/indirect 2/rm32/EDX . . . 2/r32/EDX . . # copy *EDX to EDX - # syscall + # . . syscall b8/copy-to-EAX 4/imm32/write cd/syscall 0x80/imm8 # . restore registers @@ -328,7 +328,7 @@ write-stderr: # s : (address array byte) -> <void> 5a/pop-to-EDX 59/pop-to-ECX 58/pop-to-EAX - # end + # . end 89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP 5d/pop-to-EBP c3/return |