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fixed loop bug in kernel #4

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fixed loop bug in kernel #4

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17 changes: 5 additions & 12 deletions kernel.asm
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Original file line number Diff line number Diff line change
Expand Up @@ -157,7 +157,7 @@ find_block_loop_top:
find_block_continue_loop:
;; Advance to the next entry.
ADDUS %G2 %G2 12
JUMP +find_device_loop_top
JUMP +find_block_loop_top
find_block_loop_failure:
;; Set the return value to a null pointer.
HALT
Expand Down Expand Up @@ -1175,7 +1175,8 @@ fd2:
JUMP *+return ;Jump to the return address specified in stack


;; check if file exists
;; check if file exists, returns block # if it does, returns 0 if it does not.
;; basically map's string to inode. Takes pointer to a filename as it's parameter.
fileExists_Args:
SUBUS %SP %SP 4
JUMP +fArgs
Expand All @@ -1186,16 +1187,6 @@ fileExists:
COPY %G0 +return2
CALL +fCall *%G0

mapStringToInode_Args:
SUBUS %SP %SP 4
JUMP +fArgs

mapStringToInode:
SUBUS %SP %SP 4
COPY *%SP 1
COPY %G0 +return2
CALL +fCall *%G0

;; block_trigger, block_base, block_limit, block_num
COPY *+block_num 0x01 ;; first block, has filename -> inode number mappings
COPY *+block_trigger 0x00
Expand All @@ -1222,6 +1213,7 @@ parseFileNameTop: ;; inner loop (goes through characters in filename)
parseFileNameEnd: ;; file found at this point!
ADDUS %G2 %G2 12
COPY *%SP *%G2 ;; save file number into stack where return value should be
JUMP +fDone


parseFileFail:
Expand All @@ -1231,6 +1223,7 @@ parseFileFail:

searchFilesFail:
COPY *%SP 0x00
JUMP +fDone


;COPY %G0 +return
Expand Down