diff options
| author | Florent Revest <revest@chromium.org> | 2023-04-27 16:07:00 +0200 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2023-07-10 17:51:54 -0400 |
| commit | 8c3526fb86060cb53a1f4ca6cc44eb036afcf43e (patch) | |
| tree | 76657abb47a665e755dd4a93971f1e3d77bd0e2b /samples/ftrace/ftrace-direct-too.c | |
| parent | 8564c315876ab86fcaf8e7f558d6a84cb2ce5590 (diff) | |
arm64: ftrace: Add direct call trampoline samples support
The ftrace samples need per-architecture trampoline implementations
to save and restore argument registers around the calls to
my_direct_func* and to restore polluted registers (eg: x30).
These samples also include <asm/asm-offsets.h> which, on arm64, is not
necessary and redefines previously defined macros (resulting in
warnings) so these includes are guarded by !CONFIG_ARM64.
Link: https://lkml.kernel.org/r/20230427140700.625241-3-revest@chromium.org
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Florent Revest <revest@chromium.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'samples/ftrace/ftrace-direct-too.c')
| -rw-r--r-- | samples/ftrace/ftrace-direct-too.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/samples/ftrace/ftrace-direct-too.c b/samples/ftrace/ftrace-direct-too.c index 7986033887f6..e9804c5307c0 100644 --- a/samples/ftrace/ftrace-direct-too.c +++ b/samples/ftrace/ftrace-direct-too.c @@ -3,7 +3,9 @@ #include <linux/mm.h> /* for handle_mm_fault() */ #include <linux/ftrace.h> +#ifndef CONFIG_ARM64 #include <asm/asm-offsets.h> +#endif extern void my_direct_func(struct vm_area_struct *vma, unsigned long address, unsigned int flags, struct pt_regs *regs); @@ -72,6 +74,30 @@ asm ( #endif /* CONFIG_S390 */ +#ifdef CONFIG_ARM64 + +asm ( +" .pushsection .text, \"ax\", @progbits\n" +" .type my_tramp, @function\n" +" .globl my_tramp\n" +" my_tramp:" +" bti c\n" +" sub sp, sp, #48\n" +" stp x9, x30, [sp]\n" +" stp x0, x1, [sp, #16]\n" +" stp x2, x3, [sp, #32]\n" +" bl my_direct_func\n" +" ldp x30, x9, [sp]\n" +" ldp x0, x1, [sp, #16]\n" +" ldp x2, x3, [sp, #32]\n" +" add sp, sp, #48\n" +" ret x9\n" +" .size my_tramp, .-my_tramp\n" +" .popsection\n" +); + +#endif /* CONFIG_ARM64 */ + #ifdef CONFIG_LOONGARCH asm ( |