Linux-2.6.12-rc2
[linux-2.6/kvm.git] / arch / sparc64 / lib / U1copy_from_user.S
blob93146a81e2d35dc4be57089582b4769550536c5e
1 /* U1copy_from_user.S: UltraSparc-I/II/IIi/IIe optimized copy from userspace.
2  *
3  * Copyright (C) 1999, 2000, 2004 David S. Miller (davem@redhat.com)
4  */
6 #define EX_LD(x)                \
7 98:     x;                      \
8         .section .fixup;        \
9         .align 4;               \
10 99:     retl;                   \
11          mov    1, %o0;         \
12         .section __ex_table;    \
13         .align 4;               \
14         .word 98b, 99b;         \
15         .text;                  \
16         .align 4;
18 #define FUNC_NAME               ___copy_from_user
19 #define LOAD(type,addr,dest)    type##a [addr] %asi, dest
20 #define LOAD_BLK(addr,dest)     ldda [addr] ASI_BLK_AIUS, dest
21 #define EX_RETVAL(x)            0
23         /* Writing to %asi is _expensive_ so we hardcode it.
24          * Reading %asi to check for KERNEL_DS is comparatively
25          * cheap.
26          */
27 #define PREAMBLE                                        \
28         rd              %asi, %g1;                      \
29         cmp             %g1, ASI_AIUS;                  \
30         bne,pn          %icc, memcpy_user_stub;         \
31          nop;                                           \
33 #include "U1memcpy.S"