| /* |
| * Copyright (c) 2021, Google Inc. All rights reserved |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining |
| * a copy of this software and associated documentation files |
| * (the "Software"), to deal in the Software without restriction, |
| * including without limitation the rights to use, copy, modify, merge, |
| * publish, distribute, sublicense, and/or sell copies of the Software, |
| * and to permit persons to whom the Software is furnished to do so, |
| * subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be |
| * included in all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
| * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY |
| * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
| * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
| * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| */ |
| |
| #include <asm.h> |
| #include <arch/asm_macros.h> |
| #include <err.h> |
| |
| /* status_t copy_from_anywhere(void *kdest, user_addr_t usrc, size_t len) */ |
| FUNCTION(copy_from_anywhere) |
| cbz x2, .Lcopy_from_anywhere_done |
| .Lcopy_from_anywhere_loop: |
| set_fault_handler .Lcopy_from_anywhere_tryuser |
| ldrb w9, [x1] |
| |
| .Lcopy_from_anywhere_continue: |
| add x1, x1, #1 |
| strb w9, [x0], #1 |
| subs x2, x2, #1 |
| b.hi .Lcopy_from_anywhere_loop |
| .Lcopy_from_anywhere_done: |
| mov x0, #0 |
| ret |
| |
| .Lcopy_from_anywhere_tryuser: |
| set_fault_handler .Lcopy_from_anywhere_fault |
| ldtrb w9, [x1] |
| b .Lcopy_from_anywhere_continue |
| |
| .Lcopy_from_anywhere_fault: |
| strb wzr, [x0], #1 |
| subs x2, x2, #1 |
| b.hi .Lcopy_from_anywhere_fault |
| mov x0, #ERR_FAULT |
| ret |
| |
| /* int tag_for_addr_(vaddr_t addr) */ |
| FUNCTION(tag_for_addr_) |
| .arch_extension memtag |
| set_fault_handler .Ltag_for_addr__fault |
| ldg x0, [x0] |
| ubfx x0, x0, #56, #4 |
| ret |
| |
| .Ltag_for_addr__fault: |
| mov x0, #ERR_FAULT |
| ret |
