diff options
Diffstat (limited to 'src/thread/powerpc/clone.s')
| -rw-r--r-- | src/thread/powerpc/clone.s | 34 |
1 files changed, 9 insertions, 25 deletions
diff --git a/src/thread/powerpc/clone.s b/src/thread/powerpc/clone.s index 54a2314e..dc5c74c6 100644 --- a/src/thread/powerpc/clone.s +++ b/src/thread/powerpc/clone.s @@ -13,12 +13,10 @@ __clone: # SYS_clone = 120 # SYS_exit = 1 -# in order that the child can find the start func and its arg, we need to store it into -# non-volative regs. to do so, we have to store those 2 regs into our stackframe, so -# we can restore them later. -subi 1, 1, 16 -stw 30, 12(1) -stw 31, 8(1) +# store non-volatile regs r30, r31 on stack in order to put our +# start func and its arg there +stwu 30, -16(1) +stw 31, 4(1) # save r3 (func) into r30, and r6(arg) into r31 mr 30, 3 @@ -37,19 +35,9 @@ li 0, 120 sc # check for syscall error -#this code should be more efficient, but it borks -#bns+ 1f # jump to label 1 if no summary overflow. +bns+ 1f # jump to label 1 if no summary overflow. #else -#neg 3, 3 #negate the result (errno) -#b 2f # jump to epilogue - -# this error check code at least does not spoil the clone call. -#mfcr 0 # Check for an error -#rlwinm 4, 0, 0, 3, 3 # by checking for bit 28. -#cmplwi 0, 4, 0 # It is an error if non-zero. -#beq 0, 1f # Jump if not an error. -#neg 3, 3 # Negate the error number. -#b 2f # jump to epilogue +neg 3, 3 #negate the result (errno) 1: # compare sc result with 0 cmpwi cr7, 3, 0 @@ -58,8 +46,7 @@ cmpwi cr7, 3, 0 bne cr7, 2f #else: we're the child -#call funcptr -# move arg (d) into r3 +#call funcptr: move arg (d) into r3 mr 3, 31 #move r30 (funcptr) into CTR reg mtctr 30 @@ -72,12 +59,9 @@ sc 2: # restore stack -lwz 30, 12(1) -lwz 31, 8(1) +lwz 30, 0(1) +lwz 31, 4(1) addi 1, 1, 16 blr - - - |