[PATCH] 2/2 2.5.45 cleanup & add original copy_ro/from_user

Akira Tsukamoto
2002-11-02T09:00:35Z

This consists mainly of the optimized copy routine for PIII/P4.

It is basically identical to what was introduced in 2.5.45.
However,
I tweaked a bit. I deleted accessing ‘movsl_mask’ every time, which
is unlikely to change during the run time.
If anybody finds a better copy routine, don’t have to touch uaccess.h.
just edit here.

Akira Tsukamoto

diff -Nur -X dontdiff linux-2.5.45/include/asm-i386/uaccess-intel.h linux-2.5.45-aki/include/asm-i386/uaccess-intel.h
--- linux-2.5.45/include/asm-i386/uaccess-intel.h Wed Dec 31 19:00:00 1969
+++ linux-2.5.45-aki/include/asm-i386/uaccess-intel.h Sat Nov 2 03:00:45 2002
@@ -0,0 +1,294 @@
+#ifndef __i386_UACCESS_INTEL_H
+#define __i386_UACCESS_INTEL_H
+/*
+ * PentiumIII/Pentium4 Copy To/From Userspace, taka version.
+ *
+ * Split into CPU specific files by Akira Tsukamoto to keep #ifdef noise down.
+ */
+
+#define MOVSL_MASK 7
+static inline int
+is_rep_movsl_faster(const void *a1, const void *a2, unsigned long n)
+{
+ if (n >= 64 && (((const long)a1 ^ (const long)a2) & MOVSL_MASK))
+ return 0;
+ return 1;
+}
+
+/* Using rep; movsl. */
+#define __copy_user_rep_movsl(to,from,size) \
+do { \
+ int __d0, __d1, __d2; \
+ __asm__ __volatile__( \
+ " cmp $7,%0\n" \
+ " jbe 1f\n" \
+ " movl %1,%0\n" \
+ " negl %0\n" \
+ " andl $7,%0\n" \
+ " subl %0,%3\n" \
+ "4: rep; movsb\n" \
+ " movl %3,%0\n" \
+ " shrl $2,%0\n" \
+ " andl $3,%3\n" \
+ " .align 2,0x90\n" \
+ "0: rep; movsl\n" \
+ " movl %3,%0\n" \
+ "1: rep; movsb\n" \
+ "2:\n" \
+ ".section .fixup,\"ax\"\n" \
+ "5: addl %3,%0\n" \
+ " jmp 2b\n" \
+ "3: lea 0(%3,%0,4),%0\n" \
+ " jmp 2b\n" \
+ ".previous\n" \
+ ".section __ex_table,\"a\"\n" \
+ " .align 4\n" \
+ " .long 4b,5b\n" \
+ " .long 0b,3b\n" \
+ " .long 1b,2b\n" \
+ ".previous" \
+ : "=&c"(size), "=&D" (__d0), "=&S" (__d1), "=r"(__d2) \
+ : "3"(size), "0"(size), "1"(to), "2"(from) \
+ : "memory"); \
+} while (0)
+
+#define __copy_user_zeroing_rep_movsl(to,from,size) \
+do { \
+ int __d0, __d1, __d2; \
+ __asm__ __volatile__( \
+ " cmp $7,%0\n" \
+ " jbe 1f\n" \
+ " movl %1,%0\n" \
+ " negl %0\n" \
+ " andl $7,%0\n" \
+ " subl %0,%3\n" \
+ "4: rep; movsb\n" \
+ " movl %3,%0\n" \
+ " shrl $2,%0\n" \
+ " andl $3,%3\n" \
+ " .align 2,0x90\n" \
+ "0: rep; movsl\n" \
+ " movl %3,%0\n" \
+ "1: rep; movsb\n" \
+ "2:\n" \
+ ".section .fixup,\"ax\"\n" \
+ "5: addl %3,%0\n" \
+ " jmp 6f\n" \
+ "3: lea 0(%3,%0,4),%0\n" \
+ "6: pushl %0\n" \
+ " pushl %%eax\n" \
+ " xorl %%eax,%%eax\n" \
+ " rep; stosb\n" \
+ " popl %%eax\n" \
+ " popl %0\n" \
+ " jmp 2b\n" \
+ ".previous\n" \
+ ".section __ex_table,\"a\"\n" \
+ " .align 4\n" \
+ " .long 4b,5b\n" \
+ " .long 0b,3b\n" \
+ " .long 1b,6b\n" \
+ ".previous" \
+ : "=&c"(size), "=&D" (__d0), "=&S" (__d1), "=r"(__d2) \
+ : "3"(size), "0"(size), "1"(to), "2"(from) \
+ : "memory"); \
+} while (0)
+
+
+/* Using bulk movl. */
+#define __copy_user_movl(to,from,size) \
+do { \
+ int d0, d1; \
+ __asm__ __volatile__( \
+ " .align 2,0x90\n" \
+ "0: movl 32(%4), %%eax\n" \
+ " cmpl $67, %0\n" \
+ " jbe 1f\n" \
+ " movl 64(%4), %%eax\n" \
+ " .align 2,0x90\n" \
+ "1: movl 0(%4), %%eax\n" \
+ " movl 4(%4), %%edx\n" \
+ "2: movl %%eax, 0(%3)\n" \
+ "21: movl %%edx, 4(%3)\n" \
+ " movl 8(%4), %%eax\n" \
+ " movl 12(%4),%%edx\n" \
+ "3: movl %%eax, 8(%3)\n" \
+ "31: movl %%edx, 12(%3)\n" \
+ " movl 16(%4), %%eax\n" \
+ " movl 20(%4), %%edx\n" \
+ "4: movl %%eax, 16(%3)\n" \
+ "41: movl %%edx, 20(%3)\n" \
+ " movl 24(%4), %%eax\n" \
+ " movl 28(%4), %%edx\n" \
+ "10: movl %%eax, 24(%3)\n" \
+ "51: movl %%edx, 28(%3)\n" \
+ " movl 32(%4), %%eax\n" \
+ " movl 36(%4), %%edx\n" \
+ "11: movl %%eax, 32(%3)\n" \
+ "61: movl %%edx, 36(%3)\n" \
+ " movl 40(%4), %%eax\n" \
+ " movl 44(%4), %%edx\n" \
+ "12: movl %%eax, 40(%3)\n" \
+ "71: movl %%edx, 44(%3)\n" \
+ " movl 48(%4), %%eax\n" \
+ " movl 52(%4), %%edx\n" \
+ "13: movl %%eax, 48(%3)\n" \
+ "81: movl %%edx, 52(%3)\n" \
+ " movl 56(%4), %%eax\n" \
+ " movl 60(%4), %%edx\n" \
+ "14: movl %%eax, 56(%3)\n" \
+ "91: movl %%edx, 60(%3)\n" \
+ " addl $-64, %0\n" \
+ " addl $64, %4\n" \
+ " addl $64, %3\n" \
+ " cmpl $63, %0\n" \
+ " ja 0b\n" \
+ "5: movl %0, %%eax\n" \
+ " shrl $2, %0\n" \
+ " andl $3, %%eax\n" \
+ " cld\n" \
+ "6: rep; movsl\n" \
+ " movl %%eax, %0\n" \
+ "7: rep; movsb\n" \
+ "8:\n" \
+ ".section .fixup,\"ax\"\n" \
+ "9: lea 0(%%eax,%0,4),%0\n" \
+ " jmp 8b\n" \
+ ".previous\n" \
+ ".section __ex_table,\"a\"\n" \
+ " .align 4\n" \
+ " .long 2b,8b\n" \
+ " .long 21b,8b\n" \
+ " .long 3b,8b\n" \
+ " .long 31b,8b\n" \
+ " .long 4b,8b\n" \
+ " .long 41b,8b\n" \
+ " .long 10b,8b\n" \
+ " .long 51b,8b\n" \
+ " .long 11b,8b\n" \
+ " .long 61b,8b\n" \
+ " .long 12b,8b\n" \
+ " .long 71b,8b\n" \
+ " .long 13b,8b\n" \
+ " .long 81b,8b\n" \
+ " .long 14b,8b\n" \
+ " .long 91b,8b\n" \
+ " .long 6b,9b\n" \
+ " .long 7b,8b\n" \
+ ".previous" \
+ : "=&c"(size), "=&D" (d0), "=&S" (d1) \
+ : "1"(to), "2"(from), "0"(size) \
+ : "eax", "edx", "memory"); \
+} while (0)
+
+#define __copy_user_zeroing_movl(to,from,size) \
+do { \
+ int d0, d1; \
+ __asm__ __volatile__( \
+ " .align 2,0x90\n" \
+ "0: movl 32(%4), %%eax\n" \
+ " cmpl $67, %0\n" \
+ " jbe 2f\n" \
+ "1: movl 64(%4), %%eax\n" \
+ " .align 2,0x90\n" \
+ "2: movl 0(%4), %%eax\n" \
+ "21: movl 4(%4), %%edx\n" \
+ " movl %%eax, 0(%3)\n" \
+ " movl %%edx, 4(%3)\n" \
+ "3: movl 8(%4), %%eax\n" \
+ "31: movl 12(%4),%%edx\n" \
+ " movl %%eax, 8(%3)\n" \
+ " movl %%edx, 12(%3)\n" \
+ "4: movl 16(%4), %%eax\n" \
+ "41: movl 20(%4), %%edx\n" \
+ " movl %%eax, 16(%3)\n" \
+ " movl %%edx, 20(%3)\n" \
+ "10: movl 24(%4), %%eax\n" \
+ "51: movl 28(%4), %%edx\n" \
+ " movl %%eax, 24(%3)\n" \
+ " movl %%edx, 28(%3)\n" \
+ "11: movl 32(%4), %%eax\n" \
+ "61: movl 36(%4), %%edx\n" \
+ " movl %%eax, 32(%3)\n" \
+ " movl %%edx, 36(%3)\n" \
+ "12: movl 40(%4), %%eax\n" \
+ "71: movl 44(%4), %%edx\n" \
+ " movl %%eax, 40(%3)\n" \
+ " movl %%edx, 44(%3)\n" \
+ "13: movl 48(%4), %%eax\n" \
+ "81: movl 52(%4), %%edx\n" \
+ " movl %%eax, 48(%3)\n" \
+ " movl %%edx, 52(%3)\n" \
+ "14: movl 56(%4), %%eax\n" \
+ "91: movl 60(%4), %%edx\n" \
+ " movl %%eax, 56(%3)\n" \
+ " movl %%edx, 60(%3)\n" \
+ " addl $-64, %0\n" \
+ " addl $64, %4\n" \
+ " addl $64, %3\n" \
+ " cmpl $63, %0\n" \
+ " ja 0b\n" \
+ "5: movl %0, %%eax\n" \
+ " shrl $2, %0\n" \
+ " andl $3, %%eax\n" \
+ " cld\n" \
+ "6: rep; movsl\n" \
+ " movl %%eax,%0\n" \
+ "7: rep; movsb\n" \
+ "8:\n" \
+ ".section .fixup,\"ax\"\n" \
+ "9: lea 0(%%eax,%0,4),%0\n" \
+ "16: pushl %0\n" \
+ " pushl %%eax\n" \
+ " xorl %%eax,%%eax\n" \
+ " rep; stosb\n" \
+ " popl %%eax\n" \
+ " popl %0\n" \
+ " jmp 8b\n" \
+ ".previous\n" \
+ ".section __ex_table,\"a\"\n" \
+ " .align 4\n" \
+ " .long 0b,16b\n" \
+ " .long 1b,16b\n" \
+ " .long 2b,16b\n" \
+ " .long 21b,16b\n" \
+ " .long 3b,16b\n" \
+ " .long 31b,16b\n" \
+ " .long 4b,16b\n" \
+ " .long 41b,16b\n" \
+ " .long 10b,16b\n" \
+ " .long 51b,16b\n" \
+ " .long 11b,16b\n" \
+ " .long 61b,16b\n" \
+ " .long 12b,16b\n" \
+ " .long 71b,16b\n" \
+ " .long 13b,16b\n" \
+ " .long 81b,16b\n" \
+ " .long 14b,16b\n" \
+ " .long 91b,16b\n" \
+ " .long 6b,9b\n" \
+ " .long 7b,16b\n" \
+ ".previous" \
+ : "=&c"(size), "=&D" (d0), "=&S" (d1) \
+ : "1"(to), "2"(from), "0"(size) \
+ : "eax", "edx", "memory"); \
+} while (0)
+
+/* These two will go inside copy_to/from_user() in usercopy.c */
+#define __do_copy_user(to,from,n) \
+do { \
+ if (is_rep_movsl_faster(to, from, n)) \
+ __copy_user_rep_movsl(to, from, n); \
+ else \
+ __copy_user_movl(to, from, n); \
+} while (0)
+
+#define __do_copy_user_zeroing(to,from,n) \
+do { \
+ if (is_rep_movsl_faster(to, from, n)) \
+ __copy_user_zeroing_rep_movsl(to,from,n); \
+ else \
+ __copy_user_zeroing_movl(to, from, n); \
+} while (0)
+
+#endif /* __i386_UACCESS_INTEL_H */