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Use an add instead of a load to link the stack frames correctly since something seems to be clobbering the first linking pointer. Just add 8 instead of adding 4 in two places. Copy comments over from mac version. b=108646 r=sfraser sr=beard

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dbaron%fas.harvard.edu 2001-11-28 01:24:06 +00:00
parent 2cf04d7646
commit 25a700efcb
1 changed files with 26 additions and 32 deletions
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58
xpcom/reflect/xptcall/src/md/unix/xptcinvoke_asm_ppc_rhapsody.s
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@ -24,7 +24,7 @@
#
# ** Assumed vtable layout (obtained by disassembling with gdb):
# ** 4 bytes per vtable entry, skip 0th entry, so the mapping
# ** 4 bytes per vtable entry, skip 0th and 1st entries, so the mapping
# ** from index to entry is (4 * index) + 8.
#
@ -42,12 +42,15 @@ __XPTC_InvokeByIndex:
#
# save off the incoming values in the callers parameter area
#
stw r3,24(r1)
stw r4,28(r1)
stw r5,32(r1)
stw r6,36(r1)
stw r3,24(r1) ; that
stw r4,28(r1) ; methodIndex
stw r5,32(r1) ; paramCount
stw r6,36(r1) ; params
stw r0,8(r1)
stwu r1,-144(r1) ; keep 16-byte aligned
stwu r1,-144(r1) ; 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
#
@ -57,32 +60,27 @@ __XPTC_InvokeByIndex:
stwu r1,-24(r1)
bl _invoke_count_words
lwz r1,0(r1)
# nop
# prepare args for 'invoke_copy_to_stack' call
#
lwz r4,176(r1)
lwz r5,180(r1)
mr r6,r1
slwi r3,r3,2
addi r3,r3,28
mr r31,r1
sub r1,r1,r3
clrrwi r1,r1,4 ; keep 16-byte aligned
lwz r3,0(r31)
stw r3,0(r1)
addi r3,r1,28
lwz r4,176(r1) ; paramCount
lwz r5,180(r1) ; params
mr r6,r1 ; fprData
slwi r3,r3,2 ; number of stack bytes required
addi r3,r3,28 ; linkage area
mr r31,r1 ; save original stack top
sub r1,r1,r3 ; bump the stack
clrrwi r1,r1,4 ; keep the stack 16-byte aligned
addi r3,r31,144 ; act like real alloca, so 0(sp) always
stw r3,0(r1) ; points back to previous stack frame
addi r3,r1,28 ; parameter pointer excludes linkage area size + 'this'
# create "temporary" stack frame for _invoke_copy_to_stack to operate in.
stwu r1,-40(r1)
bl _invoke_copy_to_stack
# nop
# remove temporary stack frame.
lwz r1,0(r1)
lfd f1,0(r31)
lfd f2,8(r31)
lfd f3,16(r31)
@ -97,13 +95,12 @@ __XPTC_InvokeByIndex:
lfd f12,88(r31)
lfd f13,96(r31)
lwz r3,168(r31)
lwz r4,0(r3)
lwz r5,172(r31)
slwi r5,r5,2 ; entry_offset = (index * 4) + 4
addi r5,r5,4
add r12,r5,r4
lwz r12,4(r12)
lwz r3,168(r31) ; that
lwz r4,0(r3) ; get vTable from 'that'
lwz r5,172(r31) ; methodIndex
slwi r5,r5,2 ; methodIndex * 4
addi r5,r5,8 ; (methodIndex * 4) + 8
lwzx r12,r5,r4 ; get function pointer
lwz r4,28(r1)
lwz r5,32(r1)
@ -113,9 +110,6 @@ __XPTC_InvokeByIndex:
lwz r9,48(r1)
lwz r10,52(r1)
# bl .__ptr_glue
# nop
mtlr r12
blrl