projects / mirror_ubuntu-zesty-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
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 | */ | |
| 5 | ||
| 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; | |
| 17 | ||
| 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 | |
| 22 | ||
| 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; \ | |
| 32 | ||
| 33 | #include "U1memcpy.S" |