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 | |
| 4059386c | 5 | # SPDX-License-Identifier: BSD-2-Clause-Patent\r |
| 284fb5c8 OM |
6 | #\r |
| 7 | #------------------------------------------------------------------------------\r | |
| 8 | \r | |
| 903e3124 | 9 | #include <AsmMacroIoLib.h>\r |
| 284fb5c8 OM |
10 | \r |
| 11 | # VOID\r | |
| 12 | # EFIAPI\r | |
| 13 | # memmove (\r | |
| 14 | # IN VOID *Destination,\r | |
| 15 | # IN CONST VOID *Source,\r | |
| 16 | # IN UINT32 Size\r | |
| 17 | # );\r | |
| 903e3124 | 18 | ASM_FUNC(memmove)\r |
| 284fb5c8 OM |
19 | CMP r2, #0\r |
| 20 | BXEQ lr\r | |
| 21 | CMP r0, r1\r | |
| 22 | BXEQ lr\r | |
| 23 | BHI memmove_backward\r | |
| 24 | \r | |
| 25 | memmove_forward:\r | |
| 26 | LDRB r3, [r1], #1\r | |
| 27 | STRB r3, [r0], #1\r | |
| 28 | SUBS r2, r2, #1\r | |
| 29 | BXEQ lr\r | |
| 30 | B memmove_forward\r | |
| 31 | \r | |
| 32 | memmove_backward:\r | |
| 33 | add r0, r2\r | |
| 34 | add r1, r2\r | |
| 35 | memmove_backward_loop:\r | |
| 36 | LDRB r3, [r1, #-1]!\r | |
| 37 | STRB r3, [r0, #-1]!\r | |
| 38 | SUBS r2, r2, #1\r | |
| 39 | BXEQ lr\r | |
| 40 | B memmove_backward_loop\r |