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author | Heinrich Schuchardt <xypron.glpk@gmx.de> | 2019-01-20 10:20:30 +0300 |
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committer | Alexander Graf <agraf@suse.de> | 2019-02-13 11:40:06 +0300 |
commit | f51a226436a874ad4a9fda48dfab169155a48d49 (patch) | |
tree | 5ba4d80df0c49f36967c99b63ed7b5fde5fc7a14 /lib | |
parent | 1170fee695197783185b1fa0c398945b248fb397 (diff) | |
download | u-boot-f51a226436a874ad4a9fda48dfab169155a48d49.tar.xz |
efi_loader: provide freestanding library
GCC requires that freestanding programs provide memcpy(), memmove(),
memset(), and memcmp().
Provide the required library functions.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'lib')
-rw-r--r-- | lib/efi_loader/efi_freestanding.c | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/lib/efi_loader/efi_freestanding.c b/lib/efi_loader/efi_freestanding.c new file mode 100644 index 0000000000..bd9da5bbc8 --- /dev/null +++ b/lib/efi_loader/efi_freestanding.c @@ -0,0 +1,90 @@ +// 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; +} |