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arm64: ftrace: always pass instrumented pc in x0 

The core ftrace hooks take the instrumented PC in x0, but for some
reason arm64's prepare_ftrace_return() takes this in x1.

For consistency, let's flip the argument order and always pass the
instrumented PC in x0.

There should be no functional change as a result of this patch.

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>
hifive-unleashed-5.1
Mark Rutland 2018-11-15 22:42:03 +00:00 committed by Will Deacon
parent 49e258e05e
commit 7dc48bf96a
2 changed files with 4 additions and 4 deletions
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6
arch/arm64/kernel/entry-ftrace.S
View File

@ -176,10 +176,10 @@ ENDPROC(ftrace_stub)
* and run return_to_handler() later on its exit.
*/
ENTRY(ftrace_graph_caller)
mcount_get_lr_addr x0 // pointer to function's saved lr
mcount_get_pc x1 // function's pc
mcount_get_pc x0 // function's pc
mcount_get_lr_addr x1 // pointer to function's saved lr
mcount_get_parent_fp x2 // parent's fp
bl prepare_ftrace_return // prepare_ftrace_return(&lr, pc, fp)
bl prepare_ftrace_return // prepare_ftrace_return(pc, &lr, fp)
mcount_exit
ENDPROC(ftrace_graph_caller)

2
arch/arm64/kernel/ftrace.c
View File

@ -211,7 +211,7 @@ int __init ftrace_dyn_arch_init(void)
*
* Note that @frame_pointer is used only for sanity check later.
*/
void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr,
void prepare_ftrace_return(unsigned long self_addr, unsigned long *parent,
unsigned long frame_pointer)
{
unsigned long return_hooker = (unsigned long)&return_to_handler;