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arm64: ftrace: enable graph FP test 

The core frace code has an optional sanity check on the frame pointer
passed by ftrace_graph_caller and return_to_handler. This is cheap,
useful, and enabled unconditionally on x86, sparc, and riscv.

Let's do the same on arm64, so that we can catch any problems early.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: AKASHI Takahiro <takahiro.akashi@linaro.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Torsten Duwe <duwe@suse.de>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Mark Rutland 2018-11-15 22:42:00 +00:00 committed by Will Deacon
parent e4fe196642
commit 5c176aff5b
2 changed files with 2 additions and 2 deletions
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1
arch/arm64/include/asm/ftrace.h
View File

@ -13,6 +13,7 @@
#include <asm/insn.h>
#define HAVE_FUNCTION_GRAPH_FP_TEST
#define MCOUNT_ADDR ((unsigned long)_mcount)
#define MCOUNT_INSN_SIZE AARCH64_INSN_SIZE

3
arch/arm64/kernel/entry-ftrace.S
View File

@ -207,8 +207,7 @@ ENDPROC(ftrace_graph_caller)
* void return_to_handler(void)
*
* Run ftrace_return_to_handler() before going back to parent.
* @fp is checked against the value passed by ftrace_graph_caller()
* only when HAVE_FUNCTION_GRAPH_FP_TEST is enabled.
* @fp is checked against the value passed by ftrace_graph_caller().
*/
ENTRY(return_to_handler)
save_return_regs