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fix for bug #98290, keep stack aligned to 16 byte boundaries, r=beard, sr=sfraser

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git-svn-id: svn://10.0.0.236/trunk@102747 18797224-902f-48f8-a5cc-f745e15eee43
This commit is contained in:
beard%netscape.com 2001-09-11 06:10:31 +00:00
parent 39abfc8109
commit acc4c8f8c6
1 changed files with 9 additions and 7 deletions
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16
mozilla/xpcom/reflect/xptcall/src/md/mac/xptcinvoke_mac.s
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@ -42,7 +42,8 @@
stw r5,32(sp) # paramCount
stw r6,36(sp) # params
stw r0,8(sp)
stwu sp,-136(sp) # = 24 for linkage area, 8 * 13 for fprData area, 8 for saved registers
stwu sp,-144(sp) # = 24 for linkage area, 8 * 13 for fprData area, 8 for saved registers,
# 8 to keep stack 16-byte aligned.
# set up for and call 'invoke_count_words' to get new stack size
#
@ -53,14 +54,15 @@
# prepare args for 'invoke_copy_to_stack' call
#
lwz r4,168(sp) # paramCount
lwz r5,172(sp) # params
lwz r4,176(sp) # paramCount
lwz r5,180(sp) # params
# addi r6,sp,128 # fprData
mr r6,sp # fprData
slwi r3,r3,2 # number of bytes of stack required
addi r3,r3,28 # linkage area
mr r31,sp # save original stack top
sub sp,sp,r3 # bump the stack
clrrwi sp,sp,4 # keep the stack 16-byte aligned.
lwz r3,0(r31) # act like real alloca, so 0(sp) always points back to
stw r3,0(sp) # previous stack frame.
addi r3,sp,28 # parameter pointer excludes linkage area size + 'this'
@ -82,9 +84,9 @@
lfd f12,88(r31)
lfd f13,96(r31)
lwz r3,160(r31) # that
lwz r3,168(r31) # that
lwz r4,0(r3) # get vTable from 'that'
lwz r5,164(r31) # methodIndex
lwz r5,172(r31) # methodIndex
slwi r5,r5,2 # methodIndex * 4
addi r5,r5,8 # step over junk at start of vTable !
lwzx r12,r5,r4 # get function pointer
@ -102,8 +104,8 @@
mr sp,r31
lwz r0,144(sp)
addi sp,sp,136
lwz r0,152(sp)
addi sp,sp,144
mtlr r0
lwz r31,-4(sp)
blr