diff options
Diffstat (limited to 'arch/i386/lib/string_32.c')
| -rw-r--r-- | arch/i386/lib/string_32.c | 257 |
1 files changed, 0 insertions, 257 deletions
diff --git a/arch/i386/lib/string_32.c b/arch/i386/lib/string_32.c deleted file mode 100644 index 2c773fefa3dd..000000000000 --- a/arch/i386/lib/string_32.c +++ /dev/null @@ -1,257 +0,0 @@ -/* - * Most of the string-functions are rather heavily hand-optimized, - * see especially strsep,strstr,str[c]spn. They should work, but are not - * very easy to understand. Everything is done entirely within the register - * set, making the functions fast and clean. String instructions have been - * used through-out, making for "slightly" unclear code :-) - * - * AK: On P4 and K7 using non string instruction implementations might be faster - * for large memory blocks. But most of them are unlikely to be used on large - * strings. - */ - -#include <linux/string.h> -#include <linux/module.h> - -#ifdef __HAVE_ARCH_STRCPY -char *strcpy(char * dest,const char *src) -{ - int d0, d1, d2; - asm volatile( "1:\tlodsb\n\t" - "stosb\n\t" - "testb %%al,%%al\n\t" - "jne 1b" - : "=&S" (d0), "=&D" (d1), "=&a" (d2) - :"0" (src),"1" (dest) : "memory"); - return dest; -} -EXPORT_SYMBOL(strcpy); -#endif - -#ifdef __HAVE_ARCH_STRNCPY -char *strncpy(char * dest,const char *src,size_t count) -{ - int d0, d1, d2, d3; - asm volatile( "1:\tdecl %2\n\t" - "js 2f\n\t" - "lodsb\n\t" - "stosb\n\t" - "testb %%al,%%al\n\t" - "jne 1b\n\t" - "rep\n\t" - "stosb\n" - "2:" - : "=&S" (d0), "=&D" (d1), "=&c" (d2), "=&a" (d3) - :"0" (src),"1" (dest),"2" (count) : "memory"); - return dest; -} -EXPORT_SYMBOL(strncpy); -#endif - -#ifdef __HAVE_ARCH_STRCAT -char *strcat(char * dest,const char * src) -{ - int d0, d1, d2, d3; - asm volatile( "repne\n\t" - "scasb\n\t" - "decl %1\n" - "1:\tlodsb\n\t" - "stosb\n\t" - "testb %%al,%%al\n\t" - "jne 1b" - : "=&S" (d0), "=&D" (d1), "=&a" (d2), "=&c" (d3) - : "0" (src), "1" (dest), "2" (0), "3" (0xffffffffu): "memory"); - return dest; -} -EXPORT_SYMBOL(strcat); -#endif - -#ifdef __HAVE_ARCH_STRNCAT -char *strncat(char * dest,const char * src,size_t count) -{ - int d0, d1, d2, d3; - asm volatile( "repne\n\t" - "scasb\n\t" - "decl %1\n\t" - "movl %8,%3\n" - "1:\tdecl %3\n\t" - "js 2f\n\t" - "lodsb\n\t" - "stosb\n\t" - "testb %%al,%%al\n\t" - "jne 1b\n" - "2:\txorl %2,%2\n\t" - "stosb" - : "=&S" (d0), "=&D" (d1), "=&a" (d2), "=&c" (d3) - : "0" (src),"1" (dest),"2" (0),"3" (0xffffffffu), "g" (count) - : "memory"); - return dest; -} -EXPORT_SYMBOL(strncat); -#endif - -#ifdef __HAVE_ARCH_STRCMP -int strcmp(const char * cs,const char * ct) -{ - int d0, d1; - int res; - asm volatile( "1:\tlodsb\n\t" - "scasb\n\t" - "jne 2f\n\t" - "testb %%al,%%al\n\t" - "jne 1b\n\t" - "xorl %%eax,%%eax\n\t" - "jmp 3f\n" - "2:\tsbbl %%eax,%%eax\n\t" - "orb $1,%%al\n" - "3:" - :"=a" (res), "=&S" (d0), "=&D" (d1) - :"1" (cs),"2" (ct) - :"memory"); - return res; -} -EXPORT_SYMBOL(strcmp); -#endif - -#ifdef __HAVE_ARCH_STRNCMP -int strncmp(const char * cs,const char * ct,size_t count) -{ - int res; - int d0, d1, d2; - asm volatile( "1:\tdecl %3\n\t" - "js 2f\n\t" - "lodsb\n\t" - "scasb\n\t" - "jne 3f\n\t" - "testb %%al,%%al\n\t" - "jne 1b\n" - "2:\txorl %%eax,%%eax\n\t" - "jmp 4f\n" - "3:\tsbbl %%eax,%%eax\n\t" - "orb $1,%%al\n" - "4:" - :"=a" (res), "=&S" (d0), "=&D" (d1), "=&c" (d2) - :"1" (cs),"2" (ct),"3" (count) - :"memory"); - return res; -} -EXPORT_SYMBOL(strncmp); -#endif - -#ifdef __HAVE_ARCH_STRCHR -char *strchr(const char * s, int c) -{ - int d0; - char * res; - asm volatile( "movb %%al,%%ah\n" - "1:\tlodsb\n\t" - "cmpb %%ah,%%al\n\t" - "je 2f\n\t" - "testb %%al,%%al\n\t" - "jne 1b\n\t" - "movl $1,%1\n" - "2:\tmovl %1,%0\n\t" - "decl %0" - :"=a" (res), "=&S" (d0) - :"1" (s),"0" (c) - :"memory"); - return res; -} -EXPORT_SYMBOL(strchr); -#endif - -#ifdef __HAVE_ARCH_STRRCHR -char *strrchr(const char * s, int c) -{ - int d0, d1; - char * res; - asm volatile( "movb %%al,%%ah\n" - "1:\tlodsb\n\t" - "cmpb %%ah,%%al\n\t" - "jne 2f\n\t" - "leal -1(%%esi),%0\n" - "2:\ttestb %%al,%%al\n\t" - "jne 1b" - :"=g" (res), "=&S" (d0), "=&a" (d1) - :"0" (0),"1" (s),"2" (c) - :"memory"); - return res; -} -EXPORT_SYMBOL(strrchr); -#endif - -#ifdef __HAVE_ARCH_STRLEN -size_t strlen(const char * s) -{ - int d0; - int res; - asm volatile( "repne\n\t" - "scasb\n\t" - "notl %0\n\t" - "decl %0" - :"=c" (res), "=&D" (d0) - :"1" (s),"a" (0), "0" (0xffffffffu) - :"memory"); - return res; -} -EXPORT_SYMBOL(strlen); -#endif - -#ifdef __HAVE_ARCH_MEMCHR -void *memchr(const void *cs,int c,size_t count) -{ - int d0; - void *res; - if (!count) - return NULL; - asm volatile( "repne\n\t" - "scasb\n\t" - "je 1f\n\t" - "movl $1,%0\n" - "1:\tdecl %0" - :"=D" (res), "=&c" (d0) - :"a" (c),"0" (cs),"1" (count) - :"memory"); - return res; -} -EXPORT_SYMBOL(memchr); -#endif - -#ifdef __HAVE_ARCH_MEMSCAN -void *memscan(void * addr, int c, size_t size) -{ - if (!size) - return addr; - asm volatile("repnz; scasb\n\t" - "jnz 1f\n\t" - "dec %%edi\n" - "1:" - : "=D" (addr), "=c" (size) - : "0" (addr), "1" (size), "a" (c) - : "memory"); - return addr; -} -EXPORT_SYMBOL(memscan); -#endif - -#ifdef __HAVE_ARCH_STRNLEN -size_t strnlen(const char *s, size_t count) -{ - int d0; - int res; - asm volatile( "movl %2,%0\n\t" - "jmp 2f\n" - "1:\tcmpb $0,(%0)\n\t" - "je 3f\n\t" - "incl %0\n" - "2:\tdecl %1\n\t" - "cmpl $-1,%1\n\t" - "jne 1b\n" - "3:\tsubl %2,%0" - :"=a" (res), "=&d" (d0) - :"c" (s),"1" (count) - :"memory"); - return res; -} -EXPORT_SYMBOL(strnlen); -#endif |