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xtensa: Remove arch-specific strncpy() implementation

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strncpy() has no remaining callers in the kernel[1]. Remove the
xtensa-specific inline assembly implementation and __HAVE_ARCH_STRNCPY
define, falling back to the generic version in lib/string.c.

Link: https://github.com/KSPP/linux/issues/90 [1]
Signed-off-by: Kees Cook <kees@kernel.org>
This commit is contained in:
Kees Cook 2026-03-23 01:18:34 +00:00
parent dfe05fcca8
commit 58c4ce8cd6
1 changed files with 0 additions and 25 deletions
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25
arch/xtensa/include/asm/string.h
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@ -34,31 +34,6 @@ static inline char *strcpy(char *__dest, const char *__src)
return __xdest;
}
#define __HAVE_ARCH_STRNCPY
static inline char *strncpy(char *__dest, const char *__src, size_t __n)
{
register char *__xdest = __dest;
unsigned long __dummy;
if (__n == 0)
return __xdest;
__asm__ __volatile__(
"1:\n\t"
"l8ui %2, %1, 0\n\t"
"s8i %2, %0, 0\n\t"
"addi %1, %1, 1\n\t"
"addi %0, %0, 1\n\t"
"beqz %2, 2f\n\t"
"bne %1, %5, 1b\n"
"2:"
: "=r" (__dest), "=r" (__src), "=&r" (__dummy)
: "0" (__dest), "1" (__src), "r" ((uintptr_t)__src+__n)
: "memory");
return __xdest;
}
#define __HAVE_ARCH_STRCMP
static inline int strcmp(const char *__cs, const char *__ct)
{