1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
3 * The contents of this file are subject to the Netscape Public
4 * License Version 1.1 (the "License"); you may not use this file
5 * except in compliance with the License. You may obtain a copy of
6 * the License at http://www.mozilla.org/NPL/
8 * Software distributed under the License is distributed on an "AS
9 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
10 * implied. See the License for the specific language governing
11 * rights and limitations under the License.
13 * The Original Code is mozilla.org code.
15 * The Initial Developer of the Original Code is Netscape
16 * Communications Corporation. Portions created by Netscape are
17 * Copyright (C) 1998 Netscape Communications Corporation. All
23 /* Platform specific code to invoke XPCOM methods on native objects */
24 .global NS_InvokeByIndex_P
25 .type NS_InvokeByIndex_P, #function
27 NS_InvokeByIndex_P(nsISupports* that, PRUint32 methodIndex,
28 PRUint32 paramCount, nsXPTCVariant* params);
32 * Note: To simplify stack handling we allocate an extra stack
33 * frame here. In principle invoke_copy_to_stack() could
34 * save the parameters our caller's frame and we could
35 * reclaim the stackframe and do a tail call to the
36 * function. However, this gets complicated....
38 * The vtable consist of be:
49 * See gcc/cp/cp-tree.h
53 save %sp,-(128 + 64),%sp ! room for the register window and
54 ! struct pointer, rounded up to 0 % 64
55 sll %i2,4,%l0 ! assume the worst case
56 ! paramCount * 2 * 8 bytes
57 cmp %l0, 0 ! are there any args? If not,
58 be .invoke ! no need to copy args to stack
61 sub %sp,%l0,%sp ! create the additional stack space
62 add %sp,0x7ff+136,%o0 ! step past the register window, the
63 ! struct result pointer and the 'this' slot
64 mov %i2,%o1 ! paramCount
65 call invoke_copy_to_stack
69 ! load arguments from stack into the outgoing registers
70 ! BIAS is 0x7ff (2047)
73 ! load the %o1..5 64bit (extended word) output registers registers
74 ldx [%sp + 0x7ff + 136],%o1 ! %i1
75 ldx [%sp + 0x7ff + 144],%o2 ! %i2
76 ldx [%sp + 0x7ff + 152],%o3 ! %i3
77 ldx [%sp + 0x7ff + 160],%o4 ! %i4
78 ldx [%sp + 0x7ff + 168],%o5 ! %i5
80 ! load the even number double registers starting with %f2
81 ldd [%sp + 0x7ff + 136],%f2
82 ldd [%sp + 0x7ff + 144],%f4
83 ldd [%sp + 0x7ff + 152],%f6
84 ldd [%sp + 0x7ff + 160],%f8
85 ldd [%sp + 0x7ff + 168],%f10
86 ldd [%sp + 0x7ff + 176],%f12
87 ldd [%sp + 0x7ff + 184],%f14
88 ldd [%sp + 0x7ff + 192],%f16
89 ldd [%sp + 0x7ff + 200],%f18
90 ldd [%sp + 0x7ff + 208],%f20
91 ldd [%sp + 0x7ff + 216],%f22
92 ldd [%sp + 0x7ff + 224],%f24
93 ldd [%sp + 0x7ff + 232],%f26
94 ldd [%sp + 0x7ff + 240],%f28
95 ldd [%sp + 0x7ff + 248],%f30
98 ! calculate the target address from the vtable
101 sll %i1,3,%l0 ! index *= 8
102 ldx [%i0],%l1 ! *this --> address of vtable
103 ldx [%l0 + %l1],%l0 ! this->vtable[index] --> address
105 jmpl %l0,%o7 ! call the routine
106 mov %i0,%o0 ! move 'this' pointer to out register
108 mov %o0,%i0 ! propagate return value
112 .size NS_InvokeByIndex_P, .-NS_InvokeByIndex_P