efi_freestanding.c
2.47 KB
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
// SPDX-License-Identifier: GPL-2.0+
/*
* Library for freestanding binary
*
* Copyright 2019, Heinrich Schuchardt <xypron.glpk@gmx.de>
*
* GCC requires that freestanding programs provide memcpy(), memmove(),
* memset(), and memcmp().
*/
#include <common.h>
/**
* memcmp() - compare memory areas
*
* @s1: pointer to first area
* @s2: pointer to second area
* @n: number of bytes to compare
* Return: 0 if both memory areas are the same, otherwise the sign of the
* result value is the same as the sign of the difference between
* the first differing pair of bytes taken as u8.
*/
int memcmp(const void *s1, const void *s2, size_t n)
{
const u8 *pos1 = s1;
const u8 *pos2 = s2;
for (; n; --n) {
if (*pos1 != *pos2)
return *pos1 - *pos2;
++pos1;
++pos2;
}
return 0;
}
/**
* memcpy() - copy memory area
*
* @dest: destination buffer
* @src: source buffer
* @n: number of bytes to copy
* Return: pointer to destination buffer
*/
void *memmove(void *dest, const void *src, size_t n)
{
u8 *d = dest;
const u8 *s = src;
if (d <= s) {
for (; n; --n)
*d++ = *s++;
} else {
d += n;
s += n;
for (; n; --n)
*--d = *--s;
}
return dest;
}
/**
* memcpy() - copy memory area
*
* @dest: destination buffer
* @src: source buffer
* @n: number of bytes to copy
* Return: pointer to destination buffer
*/
void *memcpy(void *dest, const void *src, size_t n)
{
return memmove(dest, src, n);
}
/**
* memset() - fill memory with a constant byte
*
* @s: destination buffer
* @c: byte value
* @n: number of bytes to set
* Return: pointer to destination buffer
*/
void *memset(void *s, int c, size_t n)
{
u8 *d = s;
for (; n; --n)
*d++ = c;
return s;
}
/**
* __cyg_profile_func_enter() - record function entry
*
* This is called on every function entry when compiling with
* -finstrument-functions.
*
* We do nothing here.
*
* @param func_ptr Pointer to function being entered
* @param caller Pointer to function which called this function
*/
void __attribute__((no_instrument_function))
__cyg_profile_func_enter(void *func_ptr, void *caller)
{
}
/**
* __cyg_profile_func_exit() - record function exit
*
* This is called on every function exit when compiling with
* -finstrument-functions.
*
* We do nothing here.
*
* @param func_ptr Pointer to function being entered
* @param caller Pointer to function which called this function
*/
void __attribute__((no_instrument_function))
__cyg_profile_func_exit(void *func_ptr, void *caller)
{
}