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| author | Kartik Agaram <vc@akkartik.com> | 2019-08-25 00:32:24 -0700 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2019-08-25 00:32:24 -0700 |
| commit | 380fc367b8b17c98e3a0472675149e4c669eb9b4 (patch) | |
| tree | 314f94d593f30f4f06a1b69f1fc3b725a60569fd /apps/desugar.subx | |
| parent | d230393c924276a8bb3d9661dff688d5b07705ff (diff) | |
| download | mu-380fc367b8b17c98e3a0472675149e4c669eb9b4.tar.gz | |
parsing *(reg-disp)
Diffstat (limited to 'apps/desugar.subx')
| -rw-r--r-- | apps/desugar.subx | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/apps/desugar.subx b/apps/desugar.subx index dc36f401..cbd8a408 100644 --- a/apps/desugar.subx +++ b/apps/desugar.subx @@ -1494,6 +1494,7 @@ parse-effective-address: # word : (address slice) -> base/EAX, index/ECX, scale # read register into base # skip whitespace # if (*word->start == ')') goto end + # if (*word->start == '-') goto displacement # if (*word->start != '+') goto error2 # ++word->start to skip '+' # skip whitespace @@ -1594,6 +1595,9 @@ $parse-effective-address:compound-expression: 81 4/subop/and 3/mod/direct 0/rm32/EAX . . . . . 0xff/imm32 # bitwise and of EAX 3d/compare-EAX-and 0x29/imm32/close-paren 0f 84/jump-if-equal $parse-effective-address:end/disp32 + # if (*word->start == '-') goto displacement + 3d/compare-EAX-and 0x2d/imm32/minus + 0f 84/jump-if-equal $parse-effective-address:displacement/disp32 # if (*word->start != '+') goto error2 $parse-effective-address:check-for-index: # ++word->start to skip '+' @@ -1938,6 +1942,68 @@ test-parse-effective-address-base-displacement: 5d/pop-to-EBP c3/return +test-parse-effective-address-base-negative-displacement: + # . prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # var slice/ECX = "*(esi-3)" + b8/copy-to-EAX "*(esi-3)"/imm32 + 8b/copy 0/mod/indirect 0/rm32/EAX . . . 1/r32/ECX . . # copy *EAX to ECX + 8d/copy-address 1/mod/*+disp8 4/rm32/sib 0/base/EAX 1/index/ECX . 1/r32/ECX 4/disp8 . # copy EAX+ECX+4 to ECX + 05/add-to-EAX 4/imm32 + # . ECX = {EAX, ECX} + 51/push-ECX + 50/push-EAX + 89/copy 3/mod/direct 1/rm32/ECX . . . 4/r32/ESP . . # copy ESP to ECX + # EAX, ECX, EDX, EBX = parse-effective-address(slice) + # . . push args + 51/push-ECX + # . . call + e8/call parse-effective-address/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP + # slice clobbered beyond this point + # check-ints-equal(EAX, 6, msg) + # . . push args + 68/push "F - test-parse-effective-address-base-negative-displacement/base"/imm32 + 68/push 6/imm32/ESI + 50/push-EAX + # . . call + e8/call check-ints-equal/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP + # check-ints-equal(ECX, 4, msg) + # . . push args + 68/push "F - test-parse-effective-address-base-negative-displacement/index"/imm32 + 68/push 4/imm32/none + 51/push-ECX + # . . call + e8/call check-ints-equal/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP + # check-ints-equal(EDX, 0, msg) + # . . push args + 68/push "F - test-parse-effective-address-base-negative-displacement/scale"/imm32 + 68/push 0/imm32/none + 52/push-EDX + # . . call + e8/call check-ints-equal/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP + # check-ints-equal(EBX, -3, msg) + # . . push args + 68/push "F - test-parse-effective-address-base-negative-displacement/displacement"/imm32 + 68/push -3/imm32 + 53/push-EBX + # . . call + e8/call check-ints-equal/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP + # . epilog + 89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP + 5d/pop-to-EBP + c3/return + test-parse-effective-address-base-index: # . prolog 55/push-EBP |