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author | Abhishek Sagar <sagar.abhishek@gmail.com> | 2007-06-12 00:20:10 +0200 |
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committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2008-01-26 16:25:16 +0100 |
commit | 24ba613c9d6cad315f484e658288db152f1dc447 (patch) | |
tree | 0a94ff96c77ccf7e0415bd2bc76ab400468c5e6e /include/asm-arm/kprobes.h | |
parent | ARM kprobes: instruction single-stepping support (diff) | |
download | linux-24ba613c9d6cad315f484e658288db152f1dc447.tar.xz linux-24ba613c9d6cad315f484e658288db152f1dc447.zip |
ARM kprobes: core code
This is a full implementation of Kprobes including Jprobes and
Kretprobes support.
This ARM implementation does not follow the usual kprobes double-
exception model. The traditional model is where the initial kprobes
breakpoint calls kprobe_handler(), which returns from exception to
execute the instruction in its original context, then immediately
re-enters after a second breakpoint (or single-stepping exception)
into post_kprobe_handler(), each time the probe is hit.. The ARM
implementation only executes one kprobes exception per hit, so no
post_kprobe_handler() phase. All side-effects from the kprobe'd
instruction are resolved before returning from the initial exception.
As a result, all instructions are _always_ effectively boosted
regardless of the type of instruction, and even regardless of whether
or not there is a post-handler for the probe.
Signed-off-by: Abhishek Sagar <sagar.abhishek@gmail.com>
Signed-off-by: Quentin Barnes <qbarnes@gmail.com>
Signed-off-by: Nicolas Pitre <nico@marvell.com>
Diffstat (limited to 'include/asm-arm/kprobes.h')
-rw-r--r-- | include/asm-arm/kprobes.h | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/include/asm-arm/kprobes.h b/include/asm-arm/kprobes.h index 951322328793..273f37413ee6 100644 --- a/include/asm-arm/kprobes.h +++ b/include/asm-arm/kprobes.h @@ -18,6 +18,16 @@ #include <linux/types.h> #include <linux/ptrace.h> +#include <linux/percpu.h> + +#define ARCH_SUPPORTS_KRETPROBES +#define __ARCH_WANT_KPROBES_INSN_SLOT +#define MAX_INSN_SIZE 2 +#define MAX_STACK_SIZE 64 /* 32 would probably be OK */ + +#define regs_return_value(regs) ((regs)->ARM_r0) +#define flush_insn_slot(p) do { } while (0) +#define kretprobe_blacklist_size 0 typedef u32 kprobe_opcode_t; @@ -30,6 +40,25 @@ struct arch_specific_insn { kprobe_insn_handler_t *insn_handler; }; +struct prev_kprobe { + struct kprobe *kp; + unsigned int status; +}; + +/* per-cpu kprobe control block */ +struct kprobe_ctlblk { + unsigned int kprobe_status; + struct prev_kprobe prev_kprobe; + struct pt_regs jprobe_saved_regs; + char jprobes_stack[MAX_STACK_SIZE]; +}; + +void arch_remove_kprobe(struct kprobe *); + +int kprobe_fault_handler(struct pt_regs *regs, unsigned int fsr); +int kprobe_exceptions_notify(struct notifier_block *self, + unsigned long val, void *data); + enum kprobe_insn { INSN_REJECTED, INSN_GOOD, |