diff options
Diffstat (limited to 'apps/desugar.subx')
| -rw-r--r-- | apps/desugar.subx | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/apps/desugar.subx b/apps/desugar.subx index ede6dbbc..3559d1ef 100644 --- a/apps/desugar.subx +++ b/apps/desugar.subx @@ -1,15 +1,24 @@ # Desugar a few kinds of syntax. # # 1. -# $ echo "ab %eax" |./subx run apps/desugar +# $ echo "ab %eax" | ./subx run apps/desugar # ab 3/mod 0/rm32 # # 2. -# $ echo "ab *eax" |./subx run apps/desugar +# $ echo "ab *eax" | ./subx run apps/desugar # ab 0/mod 0/rm32 # # 3. -# ... +# $ echo "ab *(eax+4)" | ./subx run apps/desugar +# ab 2/mod 0/rm32 4/disp32 +# +# 4. +# $ echo "ab *(eax+ecx)" | ./subx run apps/desugar +# ab 0/mod 4/rm32 0/base 1/index 0/scale +# +# 5. +# $ echo "ab *(eax+ecx+4)" | ./subx run apps/desugar +# ab 2/mod 4/rm32 0/base 1/index 0/scale 4/disp32 == code # instruction effective address register displacement immediate @@ -1069,7 +1078,6 @@ parse-effective-address: # word : (address slice) -> base/EAX, index/ECX, scale 81 4/subop/and 3/mod/direct 0/rm32/EAX . . . . . 0xff/imm32 # bitwise and of EAX 3d/compare-EAX-and 0x28/imm32/open-paren 74/jump-if-equal $parse-effective-address:compound-expression/disp8 -#? ff 0/subop/increment 0/mod/indirect 6/rm32/ESI . . . . . . # increment *ESI $parse-effective-address:simple-register: # base = get-slice(Registers, word, row-size=8) # . EAX = get-slice(Registers, word, row-size=8) @@ -1087,6 +1095,8 @@ $parse-effective-address:simple-register: # return eb/jump $parse-effective-address:end/disp8 $parse-effective-address:compound-expression: + # ++word->start to skip '(' + ff 0/subop/increment 0/mod/indirect 6/rm32/ESI . . . . . . # increment *ESI $parse-effective-address:end: # return base in EAX 89/copy 3/mod/direct 0/rm32/EAX . . . 7/r32/EDI . . # copy EDI to EAX |