| /* |
| * Copyright 2008 Vitaly Mayatskikh <vmayatsk@redhat.com> |
| * Copyright 2002 Andi Kleen, SuSE Labs. |
| * Subject to the GNU Public License v2. |
| * |
| * Functions to copy from and to user space. |
| */ |
| |
| #include <linux/linkage.h> |
| #include <asm/dwarf2.h> |
| |
| #define FIX_ALIGNMENT 1 |
| |
| #include <asm/current.h> |
| #include <asm/asm-offsets.h> |
| #include <asm/thread_info.h> |
| |
| .macro ALIGN_DESTINATION |
| #ifdef FIX_ALIGNMENT |
| /* check for bad alignment of destination */ |
| movl %edi,%ecx |
| andl $7,%ecx |
| jz 102f /* already aligned */ |
| subl $8,%ecx |
| negl %ecx |
| subl %ecx,%edx |
| 100: movb (%rsi),%al |
| 101: movb %al,(%rdi) |
| incq %rsi |
| incq %rdi |
| decl %ecx |
| jnz 100b |
| 102: |
| .section .fixup,"ax" |
| 103: addl %ecx,%edx /* ecx is zerorest also */ |
| jmp copy_user_handle_tail |
| .previous |
| |
| .section __ex_table,"a" |
| .align 8 |
| .quad 100b,103b |
| .quad 101b,103b |
| .previous |
| #endif |
| .endm |
| |
| /* |
| * copy_user_nocache - Uncached memory copy with exception handling |
| * This will force destination/source out of cache for more performance. |
| */ |
| ENTRY(__copy_user_nocache) |
| CFI_STARTPROC |
| cmpl $8,%edx |
| jb 20f /* less then 8 bytes, go to byte copy loop */ |
| ALIGN_DESTINATION |
| movl %edx,%ecx |
| andl $63,%edx |
| shrl $6,%ecx |
| jz 17f |
| 1: movq (%rsi),%r8 |
| 2: movq 1*8(%rsi),%r9 |
| 3: movq 2*8(%rsi),%r10 |
| 4: movq 3*8(%rsi),%r11 |
| 5: movnti %r8,(%rdi) |
| 6: movnti %r9,1*8(%rdi) |
| 7: movnti %r10,2*8(%rdi) |
| 8: movnti %r11,3*8(%rdi) |
| 9: movq 4*8(%rsi),%r8 |
| 10: movq 5*8(%rsi),%r9 |
| 11: movq 6*8(%rsi),%r10 |
| 12: movq 7*8(%rsi),%r11 |
| 13: movnti %r8,4*8(%rdi) |
| 14: movnti %r9,5*8(%rdi) |
| 15: movnti %r10,6*8(%rdi) |
| 16: movnti %r11,7*8(%rdi) |
| leaq 64(%rsi),%rsi |
| leaq 64(%rdi),%rdi |
| decl %ecx |
| jnz 1b |
| 17: movl %edx,%ecx |
| andl $7,%edx |
| shrl $3,%ecx |
| jz 20f |
| 18: movq (%rsi),%r8 |
| 19: movnti %r8,(%rdi) |
| leaq 8(%rsi),%rsi |
| leaq 8(%rdi),%rdi |
| decl %ecx |
| jnz 18b |
| 20: andl %edx,%edx |
| jz 23f |
| movl %edx,%ecx |
| 21: movb (%rsi),%al |
| 22: movb %al,(%rdi) |
| incq %rsi |
| incq %rdi |
| decl %ecx |
| jnz 21b |
| 23: xorl %eax,%eax |
| sfence |
| ret |
| |
| .section .fixup,"ax" |
| 30: shll $6,%ecx |
| addl %ecx,%edx |
| jmp 60f |
| 40: lea (%rdx,%rcx,8),%rdx |
| jmp 60f |
| 50: movl %ecx,%edx |
| 60: sfence |
| jmp copy_user_handle_tail |
| .previous |
| |
| .section __ex_table,"a" |
| .quad 1b,30b |
| .quad 2b,30b |
| .quad 3b,30b |
| .quad 4b,30b |
| .quad 5b,30b |
| .quad 6b,30b |
| .quad 7b,30b |
| .quad 8b,30b |
| .quad 9b,30b |
| .quad 10b,30b |
| .quad 11b,30b |
| .quad 12b,30b |
| .quad 13b,30b |
| .quad 14b,30b |
| .quad 15b,30b |
| .quad 16b,30b |
| .quad 18b,40b |
| .quad 19b,40b |
| .quad 21b,50b |
| .quad 22b,50b |
| .previous |
| CFI_ENDPROC |
| ENDPROC(__copy_user_nocache) |
