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authorPratyush Anand <panand@redhat.com>2014-12-30 17:07:12 +0530
committerSteven Capper <steve.capper@linaro.org>2015-04-07 12:58:39 +0100
commitfb4e988f3d1a0868a44e430933c4297619e93304 (patch)
tree7bc941cd3bf46369ba988e59a64db2faf6bf10ef /arch/arm64/include/asm/uprobes.h
parentca722ab33771c09965172e81f77a1b4b18ed104e (diff)
downloadlinux-fb4e988f3d1a0868a44e430933c4297619e93304.tar.gz
ARM64: Add uprobe support
This patch adds support for uprobe on ARM64 architecture. Unit test for following has been done so far and they have been found working 1. Step-able instructions, like sub, ldr, add etc. 2. Simulation-able like ret. 3. uretprobe 4. Reject-able instructions like sev, wfe etc. 5. trapped and abort xol path 6. probe at unaligned user address. Currently it does not support aarch32 instruction probing. Signed-off-by: Pratyush Anand <panand@redhat.com> Signed-off-by: Steve Capper <steve.capper@linaro.org>
Diffstat (limited to 'arch/arm64/include/asm/uprobes.h')
-rw-r--r--arch/arm64/include/asm/uprobes.h37
1 files changed, 37 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/uprobes.h b/arch/arm64/include/asm/uprobes.h
new file mode 100644
index 00000000000..9d64317d1e2
--- /dev/null
+++ b/arch/arm64/include/asm/uprobes.h
@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2014-2015 Pratyush Anand <panand@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef _ASM_UPROBES_H
+#define _ASM_UPROBES_H
+
+#include <asm/debug-monitors.h>
+#include <asm/insn.h>
+#include <asm/probes.h>
+
+#define MAX_UINSN_BYTES AARCH64_INSN_SIZE
+
+#define UPROBE_SWBP_INSN BRK64_OPCODE_UPROBES
+#define UPROBE_SWBP_INSN_SIZE 4
+#define UPROBE_XOL_SLOT_BYTES MAX_UINSN_BYTES
+
+struct arch_uprobe_task {
+ unsigned long saved_fault_code;
+};
+
+struct arch_uprobe {
+ union {
+ u8 insn[MAX_UINSN_BYTES];
+ u8 ixol[MAX_UINSN_BYTES];
+ };
+ struct arch_specific_insn ainsn;
+ bool simulate;
+};
+
+extern void flush_uprobe_xol_access(struct page *page, unsigned long uaddr,
+ void *kaddr, unsigned long len);
+#endif