1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
// Select C numeric constant
.radix C
// for 64 bit mode, use .psr abi64
.psr abi64
// little endian
.psr lsb
// Section has executable code
.section .text, "ax","progbits"
// procedure named 'NS_InvokeByIndex'
.proc NS_InvokeByIndex
// manual bundling
.explicit
// extern "C" uint32_t
// invoke_copy_to_stack(uint64_t* d,
// const uint32_t paramCount, nsXPTCVariant* s)
.global invoke_copy_to_stack
// .exclass invoke_copy_to_stack, @fullyvisible
.type invoke_copy_to_stack,@function
// .exclass NS_InvokeByIndex, @fullyvisible
.type NS_InvokeByIndex,@function
// XPTC_InvokeByIndex(nsISupports* that, uint32_t methodIndex,
// uint32_t paramCount, nsXPTCVariant* params);
NS_InvokeByIndex::
.prologue
.save ar.pfs, r37
// allocate 4 input args, 6 local args, and 8 output args
alloc r37 = ar.pfs, 4, 6, 8, 0 // M
nop.i 0 ;; // I
// unwind table already knows gp, no need to specify anything
add r39 = 0, gp // A
.save rp, r36
mov r36 = rp // I
.vframe r38
add r38 = 0, sp ;; // A
// We first calculate the amount of extra memory stack space required
// for the arguments, and register storage.
// We then call invoke_copy_to_stack() to write the argument contents
// to the specified memory regions.
// We then copy the integer arguments to integer registers, and floating
// arguments to float registers.
// Lastly we load the virtual table jump pointer, and call the target
// subroutine.
// in0 : that
// in1 : methodIndex
// in2 : paramCount
// in3 : params
// stack frame size is 16 + (8 * even(paramCount)) + 64 + 64
// 16 byte frame header
// 8 * even(paramCount) memory argument area
// 64 bytes integer register area
// 64 bytes float register area
// This scheme makes sure stack fram size is a multiple of 16
.body
add r10 = 8, r0 // A
// r41 points to float register area
add r41 = -64, sp // A
// r40 points to int register area
add r40 = -128, sp ;; // A
add out1 = 0, r40 // A
add out2 = 0, r41 // A
tbit.z p14,p15 = in2,0 ;; // I
// compute 8 * even(paramCount)
(p14) shladd r11 = in2, 3, r0 ;; // A
(p15) shladd r11 = in2, 3, r10 ;; // A
sub out0 = r40, r11 ;; // A
// advance the stack frame
add sp = -16, out0 // A
add out3 = 0, in2 // A
add out4 = 0, in3 // A
// branch to invoke_copy_to_stack
br.call.sptk.few rp = invoke_copy_to_stack ;; // B
// restore gp
add gp = 0, r39 // A
add out0 = 0, in0 // A
// load the integer and float registers
ld8 out1 = [r40], 8 // M
ldfd f8 = [r41], 8 ;; // M
ld8 out2 = [r40], 8 // M
ldfd f9 = [r41], 8 ;; // M
ld8 out3 = [r40], 8 // M
ldfd f10 = [r41], 8 ;; // M
ld8 out4 = [r40], 8 // M
ldfd f11 = [r41], 8 ;; // M
ld8 out5 = [r40], 8 // M
ldfd f12 = [r41], 8 ;; // M
// 16 * methodIndex
shladd r11 = in1, 4, r0 // A
ld8 out6 = [r40], 8 // M
ldfd f13 = [r41], 8 ;; // M
ld8 out7 = [r40], 8 // M
ldfd f14 = [r41], 8 // M
add r8 = 0, in0 ;; // A
// look up virtual base table and dispatch to target subroutine
// This section assumes 64 bit pointer mode, and virtual base table
// layout from the ABI http://www.codesourcery.com/cxx-abi/abi.html
// load base table
ld8 r8 = [r8] ;; // M
add r8 = r11, r8 ;; // A
// first entry is jump pointer, second entry is gp
add r9 = 8, r8 ;; // A
// load jump pointer
ld8 r8 = [r8]
// load gp
ld8 gp = [r9] ;; // M
mov b6 = r8 ;; // I
// branch to target virtual function
br.call.sptk.few rp = b6 ;; // B
// epilog
mov ar.pfs = r37 // I
mov rp = r36 ;; // I
add sp = 0, r38 // A
add gp = 0, r39 // A
br.ret.sptk.few rp ;; // B
.endp
/* Magic indicating no need for an executable stack */
.section .note.GNU-stack, "", @progbits ; .previous
|
