projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 284fb5c8 OM |
1 | #------------------------------------------------------------------------------\r |
| 2 | #\r | |
| 3 | # Copyright (c) 2011-2014, ARM Limited. All rights reserved.\r | |
| 4 | #\r | |
| 5 | # This program and the accompanying materials\r | |
| 6 | # are licensed and made available under the terms and conditions of the BSD License\r | |
| 7 | # which accompanies this distribution. The full text of the license may be found at\r | |
| 8 | # http://opensource.org/licenses/bsd-license.php\r | |
| 9 | #\r | |
| 10 | # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
| 11 | # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
| 12 | #\r | |
| 13 | #------------------------------------------------------------------------------\r | |
| 14 | \r | |
| 15 | .text\r | |
| 16 | .align 2\r | |
| 17 | GCC_ASM_EXPORT (memmove)\r | |
| 18 | \r | |
| 19 | # VOID\r | |
| 20 | # EFIAPI\r | |
| 21 | # memmove (\r | |
| 22 | # IN VOID *Destination,\r | |
| 23 | # IN CONST VOID *Source,\r | |
| 24 | # IN UINT32 Size\r | |
| 25 | # );\r | |
| 26 | ASM_PFX(memmove):\r | |
| 27 | CMP r2, #0\r | |
| 28 | BXEQ lr\r | |
| 29 | CMP r0, r1\r | |
| 30 | BXEQ lr\r | |
| 31 | BHI memmove_backward\r | |
| 32 | \r | |
| 33 | memmove_forward:\r | |
| 34 | LDRB r3, [r1], #1\r | |
| 35 | STRB r3, [r0], #1\r | |
| 36 | SUBS r2, r2, #1\r | |
| 37 | BXEQ lr\r | |
| 38 | B memmove_forward\r | |
| 39 | \r | |
| 40 | memmove_backward:\r | |
| 41 | add r0, r2\r | |
| 42 | add r1, r2\r | |
| 43 | memmove_backward_loop:\r | |
| 44 | LDRB r3, [r1, #-1]!\r | |
| 45 | STRB r3, [r0, #-1]!\r | |
| 46 | SUBS r2, r2, #1\r | |
| 47 | BXEQ lr\r | |
| 48 | B memmove_backward_loop\r |