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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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d346a5db02
Gcc may replace calls to standard string functions by open code and/or
calls to other standard string functions. If the replacement function is
not available out-of-line, link errors will happen.
To avoid this, the out-of-line versions were provided by
arch/m68k/lib/string.c, but they were usually not linked in anymore as
typically none of its symbols are referenced by built-in code.
However, if any module would need them, they would not be available.
Hence remove the inline strcpy() and strcat() implementations, remove
arch/m68k/lib/string.c, and let the generic string library code handle it.
Impact on a typical kernel build seems minimal or nonexistent:
- .text : 0x00001000 - 0x002aac74 (2728 KiB)
- .data : 0x002ada48 - 0x00392148 ( 914 KiB)
+ .text : 0x00001000 - 0x002aacf4 (2728 KiB)
+ .data : 0x002adac8 - 0x00392148 ( 914 KiB)
See also commit e00c73ee05 ("m68k: Remove
inline strlen() implementation").
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
74 lines
1.6 KiB
C
74 lines
1.6 KiB
C
#ifndef _M68K_STRING_H_
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#define _M68K_STRING_H_
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#include <linux/types.h>
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#include <linux/compiler.h>
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#define __HAVE_ARCH_STRNLEN
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static inline size_t strnlen(const char *s, size_t count)
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{
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const char *sc = s;
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asm volatile ("\n"
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"1: subq.l #1,%1\n"
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" jcs 2f\n"
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" tst.b (%0)+\n"
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" jne 1b\n"
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" subq.l #1,%0\n"
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"2:"
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: "+a" (sc), "+d" (count));
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return sc - s;
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}
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#define __HAVE_ARCH_STRNCPY
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static inline char *strncpy(char *dest, const char *src, size_t n)
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{
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char *xdest = dest;
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asm volatile ("\n"
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" jra 2f\n"
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"1: move.b (%1),(%0)+\n"
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" jeq 2f\n"
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" addq.l #1,%1\n"
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"2: subq.l #1,%2\n"
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" jcc 1b\n"
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: "+a" (dest), "+a" (src), "+d" (n)
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: : "memory");
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return xdest;
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}
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#ifndef CONFIG_COLDFIRE
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#define __HAVE_ARCH_STRCMP
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static inline int strcmp(const char *cs, const char *ct)
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{
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char res;
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asm ("\n"
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"1: move.b (%0)+,%2\n" /* get *cs */
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" cmp.b (%1)+,%2\n" /* compare a byte */
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" jne 2f\n" /* not equal, break out */
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" tst.b %2\n" /* at end of cs? */
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" jne 1b\n" /* no, keep going */
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" jra 3f\n" /* strings are equal */
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"2: sub.b -(%1),%2\n" /* *cs - *ct */
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"3:"
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: "+a" (cs), "+a" (ct), "=d" (res));
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return res;
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}
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#endif /* CONFIG_COLDFIRE */
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#define __HAVE_ARCH_MEMMOVE
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extern void *memmove(void *, const void *, __kernel_size_t);
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#define memcmp(d, s, n) __builtin_memcmp(d, s, n)
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#define __HAVE_ARCH_MEMSET
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extern void *memset(void *, int, __kernel_size_t);
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#define memset(d, c, n) __builtin_memset(d, c, n)
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#define __HAVE_ARCH_MEMCPY
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extern void *memcpy(void *, const void *, __kernel_size_t);
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#define memcpy(d, s, n) __builtin_memcpy(d, s, n)
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#endif /* _M68K_STRING_H_ */
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