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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
| commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
| tree | a94efe259b9009378be6d90eb30d2b019d95c194 /arch/s390/kernel/kprobes_insn_page.S | |
| parent | Initial commit. (diff) | |
| download | linux-430c2fc249ea5c0536abd21c23382884005c9093.tar.xz linux-430c2fc249ea5c0536abd21c23382884005c9093.zip | |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/s390/kernel/kprobes_insn_page.S')
| -rw-r--r-- | arch/s390/kernel/kprobes_insn_page.S | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/arch/s390/kernel/kprobes_insn_page.S b/arch/s390/kernel/kprobes_insn_page.S new file mode 100644 index 000000000..f6cb022ef --- /dev/null +++ b/arch/s390/kernel/kprobes_insn_page.S @@ -0,0 +1,22 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#include <linux/linkage.h> + +/* + * insn_page is a special 4k aligned dummy function for kprobes. + * It will contain all kprobed instructions that are out-of-line executed. + * The page must be within the kernel image to guarantee that the + * out-of-line instructions are within 2GB distance of their original + * location. Using a dummy function ensures that the insn_page is within + * the text section of the kernel and mapped read-only/executable from + * the beginning on, thus avoiding to split large mappings if the page + * would be in the data section instead. + */ + .section .kprobes.text, "ax" + .align 4096 +ENTRY(kprobes_insn_page) + .rept 2048 + .word 0x07fe + .endr +ENDPROC(kprobes_insn_page) + .previous |