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x86/kprobes: Move trampoline code into RODATA 

Move optprobe trampoline code into RODATA since it is
not executed, but copied and modified to be used on
a trampoline buffer.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andrea Righi <righi.andrea@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/154998790744.31052.3016106262944915510.stgit@devbox
Signed-off-by: Ingo Molnar <mingo@kernel.org>
hifive-unleashed-5.1
Masami Hiramatsu 2019-02-13 01:11:47 +09:00 committed by Ingo Molnar
parent 0192e6535e
commit 877b145f0f
1 changed files with 2 additions and 7 deletions
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9
arch/x86/kernel/kprobes/opt.c
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@ -97,6 +97,7 @@ static void synthesize_set_arg1(kprobe_opcode_t *addr, unsigned long val)
}
asm (
".pushsection .rodata\n"
"optprobe_template_func:\n"
".global optprobe_template_entry\n"
"optprobe_template_entry:\n"
@ -136,16 +137,10 @@ asm (
#endif
".global optprobe_template_end\n"
"optprobe_template_end:\n"
".type optprobe_template_func, @function\n"
".size optprobe_template_func, .-optprobe_template_func\n");
".popsection\n");
void optprobe_template_func(void);
STACK_FRAME_NON_STANDARD(optprobe_template_func);
NOKPROBE_SYMBOL(optprobe_template_func);
NOKPROBE_SYMBOL(optprobe_template_entry);
NOKPROBE_SYMBOL(optprobe_template_val);
NOKPROBE_SYMBOL(optprobe_template_call);
NOKPROBE_SYMBOL(optprobe_template_end);
#define TMPL_MOVE_IDX \
((long)optprobe_template_val - (long)optprobe_template_entry)