| Heiko Carstens | b61e1f3 | 2020-09-18 10:26:19 +0200 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | |
| 3 | #include <linux/linkage.h> |
| 4 | |
| 5 | /* |
| 6 | * insn_page is a special 4k aligned dummy function for kprobes. |
| 7 | * It will contain all kprobed instructions that are out-of-line executed. |
| 8 | * The page must be within the kernel image to guarantee that the |
| 9 | * out-of-line instructions are within 2GB distance of their original |
| 10 | * location. Using a dummy function ensures that the insn_page is within |
| 11 | * the text section of the kernel and mapped read-only/executable from |
| 12 | * the beginning on, thus avoiding to split large mappings if the page |
| 13 | * would be in the data section instead. |
| 14 | */ |
| 15 | .section .kprobes.text, "ax" |
| 16 | .align 4096 |
| 17 | ENTRY(kprobes_insn_page) |
| 18 | .rept 2048 |
| 19 | .word 0x07fe |
| 20 | .endr |
| 21 | ENDPROC(kprobes_insn_page) |
| 22 | .previous |