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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* Platform specific code to invoke XPCOM methods on native objects */
.global NS_InvokeByIndex
.type NS_InvokeByIndex, #function
/*
NS_InvokeByIndex(nsISupports* that, uint32_t methodIndex,
uint32_t paramCount, nsXPTCVariant* params);
*/
NS_InvokeByIndex:
save %sp,-(64 + 32),%sp ! room for the register window and
! struct pointer, rounded up to 0 % 32
sll %i2,3,%l0 ! assume the worst case
! paramCount * 2 * 4 bytes
cmp %l0, 0 ! are there any args? If not,
be .invoke ! no need to copy args to stack
sub %sp,%l0,%sp ! create the additional stack space
add %sp,72,%o0 ! step past the register window, the
! struct result pointer and the 'this' slot
mov %i2,%o1 ! paramCount
call invoke_copy_to_stack
mov %i3,%o2 ! params
!
! load arguments from stack into the outgoing registers
!
ld [%sp + 72],%o1
ld [%sp + 76],%o2
ld [%sp + 80],%o3
ld [%sp + 84],%o4
ld [%sp + 88],%o5
!
! calculate the target address from the vtable
!
.invoke:
sll %i1,2,%l0 ! index *= 4
add %l0,8,%l0 ! there are 2 extra entries in the vTable
ld [%i0],%l1 ! *that --> address of vtable
ld [%l0 + %l1],%l0 ! that->vtable[index * 4 + 8] --> address
jmpl %l0,%o7 ! call the routine
mov %i0,%o0 ! move 'this' pointer to out register
mov %o0,%i0 ! propagate return value
ret
restore
.size NS_InvokeByIndex, .-NS_InvokeByIndex
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