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fix sign-extend bug

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committer: jreiser <jreiser> 1114311664 +0000
This commit is contained in:
John Reiser 2005-04-24 03:01:04 +00:00
parent 4bf81b8e1c
commit 1a84b4681c
1 changed files with 4 additions and 5 deletions
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9
src/stub/ppc_bxx.S
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@ -49,12 +49,11 @@ L5:
mtctr len # count of words
b L20
L10:
subf t1,ptr,t0 # raw distance
rlwinm t1,t0,0,6+W_CTO,31-2 # the displacement field in position
subf t1,ptr,t1 # raw distance
add t1,t1,ptr0 # relative to virtual address of base
rlwinm t1,t1,6+W_CTO,0,31-(6+W_CTO) # shift displacement up to sign bit
srawi t1,t1,6+W_CTO # sign extended displacement
rlwimi t0,t1,0,6,31-2 # t0= unfiltered instruction
stw t0,0(ptr) # replace in memory
rlwimi t0,t1,0,6 ,31-2 # unfiltered instruction
stw t0,0(ptr) # replace in memory
bdzlr- # if (0==--ctr) return; // extremely unlikely
L20:
lwzu t0,4(ptr) # t0= *++ptr;