Commit 22f367a6 authored by Youling Tang's avatar Youling Tang Committed by Huacai Chen
Browse files

LoongArch: 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 (e.g: ra).

Signed-off-by: default avatarQing Zhang <zhangqing@loongson.cn>
Signed-off-by: default avatarYouling Tang <tangyouling@loongson.cn>
Signed-off-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
parent 9cdc3b6a

arch/loongarch/Kconfig

+2 −0
Original line number Diff line number Diff line
@@ -120,6 +120,8 @@ config LOONGARCH 
	select HAVE_PERF_USER_STACK_DUMP

	select HAVE_REGS_AND_STACK_ACCESS_API

	select HAVE_RSEQ

	select HAVE_SAMPLE_FTRACE_DIRECT

	select HAVE_SAMPLE_FTRACE_DIRECT_MULTI

	select HAVE_SETUP_PER_CPU_AREA if NUMA

	select HAVE_STACKPROTECTOR

	select HAVE_SYSCALL_TRACEPOINTS

samples/ftrace/ftrace-direct-modify.c

+34 −0
Original line number Diff line number Diff line
@@ -96,6 +96,40 @@ asm ( 


#endif /* CONFIG_S390 */



#ifdef CONFIG_LOONGARCH



asm (

"	.pushsection    .text, \"ax\", @progbits\n"

"	.type		my_tramp1, @function\n"

"	.globl		my_tramp1\n"

"   my_tramp1:\n"

"	addi.d	$sp, $sp, -16\n"

"	st.d	$t0, $sp, 0\n"

"	st.d	$ra, $sp, 8\n"

"	bl	my_direct_func1\n"

"	ld.d	$t0, $sp, 0\n"

"	ld.d	$ra, $sp, 8\n"

"	addi.d	$sp, $sp, 16\n"

"	jr	$t0\n"

"	.size		my_tramp1, .-my_tramp1\n"



"	.type		my_tramp2, @function\n"

"	.globl		my_tramp2\n"

"   my_tramp2:\n"

"	addi.d	$sp, $sp, -16\n"

"	st.d	$t0, $sp, 0\n"

"	st.d	$ra, $sp, 8\n"

"	bl	my_direct_func2\n"

"	ld.d	$t0, $sp, 0\n"

"	ld.d	$ra, $sp, 8\n"

"	addi.d	$sp, $sp, 16\n"

"	jr	$t0\n"

"	.size		my_tramp2, .-my_tramp2\n"

"	.popsection\n"

);



#endif /* CONFIG_LOONGARCH */



static unsigned long my_tramp = (unsigned long)my_tramp1;

static unsigned long tramps[2] = {

	(unsigned long)my_tramp1,

samples/ftrace/ftrace-direct-multi-modify.c

+41 −0
Original line number Diff line number Diff line
@@ -103,6 +103,47 @@ asm ( 


#endif /* CONFIG_S390 */



#ifdef CONFIG_LOONGARCH

#include <asm/asm.h>



asm (

"	.pushsection    .text, \"ax\", @progbits\n"

"	.type		my_tramp1, @function\n"

"	.globl		my_tramp1\n"

"   my_tramp1:\n"

"	addi.d	$sp, $sp, -32\n"

"	st.d	$a0, $sp, 0\n"

"	st.d	$t0, $sp, 8\n"

"	st.d	$ra, $sp, 16\n"

"	move	$a0, $t0\n"

"	bl	my_direct_func1\n"

"	ld.d	$a0, $sp, 0\n"

"	ld.d	$t0, $sp, 8\n"

"	ld.d	$ra, $sp, 16\n"

"	addi.d	$sp, $sp, 32\n"

"	jr	$t0\n"

"	.size		my_tramp1, .-my_tramp1\n"



"	.type		my_tramp2, @function\n"

"	.globl		my_tramp2\n"

"   my_tramp2:\n"

"	addi.d	$sp, $sp, -32\n"

"	st.d	$a0, $sp, 0\n"

"	st.d	$t0, $sp, 8\n"

"	st.d	$ra, $sp, 16\n"

"	move	$a0, $t0\n"

"	bl	my_direct_func2\n"

"	ld.d	$a0, $sp, 0\n"

"	ld.d	$t0, $sp, 8\n"

"	ld.d	$ra, $sp, 16\n"

"	addi.d	$sp, $sp, 32\n"

"	jr	$t0\n"

"	.size		my_tramp2, .-my_tramp2\n"

"	.popsection\n"

);



#endif /* CONFIG_LOONGARCH */



static unsigned long my_tramp = (unsigned long)my_tramp1;

static unsigned long tramps[2] = {

	(unsigned long)my_tramp1,

samples/ftrace/ftrace-direct-multi.c

+25 −0
Original line number Diff line number Diff line
@@ -66,6 +66,31 @@ asm ( 


#endif /* CONFIG_S390 */



#ifdef CONFIG_LOONGARCH



#include <asm/asm.h>

asm (

"	.pushsection	.text, \"ax\", @progbits\n"

"	.type		my_tramp, @function\n"

"	.globl		my_tramp\n"

"   my_tramp:\n"

"	addi.d	$sp, $sp, -32\n"

"	st.d	$a0, $sp, 0\n"

"	st.d	$t0, $sp, 8\n"

"	st.d	$ra, $sp, 16\n"

"	move	$a0, $t0\n"

"	bl	my_direct_func\n"

"	ld.d	$a0, $sp, 0\n"

"	ld.d	$t0, $sp, 8\n"

"	ld.d	$ra, $sp, 16\n"

"	addi.d	$sp, $sp, 32\n"

"	jr	$t0\n"

"	.size		my_tramp, .-my_tramp\n"

"	.popsection\n"

);



#endif /* CONFIG_LOONGARCH */



static struct ftrace_ops direct;



static int __init ftrace_direct_multi_init(void)

samples/ftrace/ftrace-direct-too.c

+27 −0
Original line number Diff line number Diff line
@@ -70,6 +70,33 @@ asm ( 


#endif /* CONFIG_S390 */



#ifdef CONFIG_LOONGARCH



asm (

"	.pushsection	.text, \"ax\", @progbits\n"

"	.type		my_tramp, @function\n"

"	.globl		my_tramp\n"

"   my_tramp:\n"

"	addi.d	$sp, $sp, -48\n"

"	st.d	$a0, $sp, 0\n"

"	st.d	$a1, $sp, 8\n"

"	st.d	$a2, $sp, 16\n"

"	st.d	$t0, $sp, 24\n"

"	st.d	$ra, $sp, 32\n"

"	bl	my_direct_func\n"

"	ld.d	$a0, $sp, 0\n"

"	ld.d	$a1, $sp, 8\n"

"	ld.d	$a2, $sp, 16\n"

"	ld.d	$t0, $sp, 24\n"

"	ld.d	$ra, $sp, 32\n"

"	addi.d	$sp, $sp, 48\n"

"	jr	$t0\n"

"	.size		my_tramp, .-my_tramp\n"

"	.popsection\n"

);



#endif /* CONFIG_LOONGARCH */



static int __init ftrace_direct_init(void)

{

	return register_ftrace_direct((unsigned long)handle_mm_fault,