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x86, asmlinkage: Make kprobes code visible and fix assembler code

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- Make all the external assembler template symbols __visible
- Move the templates inline assembler code into a top level
  assembler statement, not inside a function. This avoids it being
  optimized away or cloned.

Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Link: http://lkml.kernel.org/r/1375740170-7446-8-git-send-email-andi@firstfloor.org
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Andi Kleen
2013-08-05 15:02:41 -07:00
committed by H. Peter Anvin
parent ff49103fdb
commit 04bb591ca7
3 changed files with 7 additions and 10 deletions
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10
arch/x86/include/asm/kprobes.h
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@ -49,10 +49,10 @@ typedef u8 kprobe_opcode_t;
#define flush_insn_slot(p) do { } while (0)
/* optinsn template addresses */
extern kprobe_opcode_t optprobe_template_entry;
extern kprobe_opcode_t optprobe_template_val;
extern kprobe_opcode_t optprobe_template_call;
extern kprobe_opcode_t optprobe_template_end;
extern __visible kprobe_opcode_t optprobe_template_entry;
extern __visible kprobe_opcode_t optprobe_template_val;
extern __visible kprobe_opcode_t optprobe_template_call;
extern __visible kprobe_opcode_t optprobe_template_end;
#define MAX_OPTIMIZED_LENGTH (MAX_INSN_SIZE + RELATIVE_ADDR_SIZE)
#define MAX_OPTINSN_SIZE \
(((unsigned long)&optprobe_template_end - \
@ -62,7 +62,7 @@ extern kprobe_opcode_t optprobe_template_end;
extern const int kretprobe_blacklist_size;
void arch_remove_kprobe(struct kprobe *p);
void kretprobe_trampoline(void);
asmlinkage void kretprobe_trampoline(void);
/* Architecture specific copy of original instruction*/
struct arch_specific_insn {