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
|
// *****************************************************************
//
// The Compcert verified compiler
//
// Xavier Leroy, Collège de France and INRIA Paris
//
// Copyright (c) Institut National de Recherche en Informatique et
// en Automatique.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// * Neither the name of the <organization> nor the
// names of its contributors may be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT
// HOLDER> BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// *********************************************************************
// Helper functions for variadic functions <stdarg.h>. AArch64 version.
#include "sysdeps.h"
// typedef struct __va_list {
// void *__stack; // next stack parameter
// void *__gr_top; // top of the save area for int regs
// void *__vr_top; // top of the save area for float regs
// int__gr_offs; // offset from gr_top to next int reg
// int__vr_offs; // offset from gr_top to next FP reg
// }
// typedef struct __va_list va_list; // struct passed by reference
// unsigned int __compcert_va_int32(va_list * ap);
// unsigned long long __compcert_va_int64(va_list * ap);
// double __compcert_va_float64(va_list * ap);
FUNCTION(__compcert_va_int32)
ldr w1, [x0, #24] // w1 = gr_offs
cbz w1, 1f
// gr_offs is not zero: load from int save area and update gr_offs
ldr x2, [x0, #8] // x2 = gr_top
ldr w2, [x2, w1, sxtw] // w2 = the next integer
add w1, w1, #8
str w1, [x0, #24] // update gr_offs
mov w0, w2
ret
// gr_offs is zero: load from stack save area and update stack pointer
1: ldr x1, [x0, #0] // x1 = stack
ldr w2, [x1, #0] // w2 = the next integer
add x1, x1, #8
str x1, [x0, #0] // update stack
mov w0, w2
ret
ENDFUNCTION(__compcert_va_int32)
FUNCTION(__compcert_va_int64)
ldr w1, [x0, #24] // w1 = gr_offs
cbz w1, 1f
// gr_offs is not zero: load from int save area and update gr_offs
ldr x2, [x0, #8] // x2 = gr_top
ldr x2, [x2, w1, sxtw] // w2 = the next long integer
add w1, w1, #8
str w1, [x0, #24] // update gr_offs
mov x0, x2
ret
// gr_offs is zero: load from stack save area and update stack pointer
1: ldr x1, [x0, #0] // x1 = stack
ldr x2, [x1, #0] // w2 = the next long integer
add x1, x1, #8
str x1, [x0, #0] // update stack
mov x0, x2
ret
ENDFUNCTION(__compcert_va_int64)
FUNCTION(__compcert_va_float64)
ldr w1, [x0, #28] // w1 = vr_offs
cbz w1, 1f
// vr_offs is not zero: load from float save area and update vr_offs
ldr x2, [x0, #16] // x2 = vr_top
ldr d0, [x2, w1, sxtw] // d0 = the next float
add w1, w1, #16
str w1, [x0, #28] // update vr_offs
ret
// gr_offs is zero: load from stack save area and update stack pointer
1: ldr x1, [x0, #0] // x1 = stack
ldr d0, [x1, #0] // d0 = the next float
add x1, x1, #8
str x1, [x0, #0] // update stack
ret
ENDFUNCTION(__compcert_va_float64)
// Right now we pass structs by reference. This is not ABI conformant.
FUNCTION(__compcert_va_composite)
b __compcert_va_int64
ENDFUNCTION(__compcert_va_composite)
|
