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Date:   Wed, 26 Apr 2023 09:49:13 +0800
From:   Youling Tang <tangyouling@...ngson.cn>
To:     Huacai Chen <chenhuacai@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Cc:     WANG Xuerui <kernel@...0n.name>, linux-kernel@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org, loongarch@...ts.linux.dev,
        loongson-kernel@...ts.loongnix.cn,
        Qing Zhang <zhangqing@...ngson.cn>
Subject: [PATCH 4/5] 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 (eg: ra).

Signed-off-by: Qing Zhang <zhangqing@...ngson.cn>
Signed-off-by: Youling Tang <tangyouling@...ngson.cn>
---
 arch/loongarch/Kconfig                      |  2 +
 samples/ftrace/ftrace-direct-modify.c       | 34 +++++++++++++++++
 samples/ftrace/ftrace-direct-multi-modify.c | 41 +++++++++++++++++++++
 samples/ftrace/ftrace-direct-multi.c        | 25 +++++++++++++
 samples/ftrace/ftrace-direct-too.c          | 27 ++++++++++++++
 samples/ftrace/ftrace-direct.c              | 23 ++++++++++++
 6 files changed, 152 insertions(+)

diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
index d6068a88d53f..322c320fe57e 100644
--- a/arch/loongarch/Kconfig
+++ b/arch/loongarch/Kconfig
@@ -118,6 +118,8 @@ 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
diff --git a/samples/ftrace/ftrace-direct-modify.c b/samples/ftrace/ftrace-direct-modify.c
index d93abbcb1f4c..ca72c3b710eb 100644
--- a/samples/ftrace/ftrace-direct-modify.c
+++ b/samples/ftrace/ftrace-direct-modify.c
@@ -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,
diff --git a/samples/ftrace/ftrace-direct-multi-modify.c b/samples/ftrace/ftrace-direct-multi-modify.c
index b58c594efb51..4708c24d47c6 100644
--- a/samples/ftrace/ftrace-direct-multi-modify.c
+++ b/samples/ftrace/ftrace-direct-multi-modify.c
@@ -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,
diff --git a/samples/ftrace/ftrace-direct-multi.c b/samples/ftrace/ftrace-direct-multi.c
index c27cf130c319..c2f1652c67bc 100644
--- a/samples/ftrace/ftrace-direct-multi.c
+++ b/samples/ftrace/ftrace-direct-multi.c
@@ -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)
diff --git a/samples/ftrace/ftrace-direct-too.c b/samples/ftrace/ftrace-direct-too.c
index 8139dce2a31c..ef64d7509773 100644
--- a/samples/ftrace/ftrace-direct-too.c
+++ b/samples/ftrace/ftrace-direct-too.c
@@ -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,
diff --git a/samples/ftrace/ftrace-direct.c b/samples/ftrace/ftrace-direct.c
index 1d3d307ca33d..9be720957bf8 100644
--- a/samples/ftrace/ftrace-direct.c
+++ b/samples/ftrace/ftrace-direct.c
@@ -63,6 +63,29 @@ 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, -32\n"
+"	st.d	$a0, $sp, 0\n"
+"	st.d	$t0, $sp, 8\n"
+"	st.d	$ra, $sp, 16\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 int __init ftrace_direct_init(void)
 {
 	return register_ftrace_direct((unsigned long)wake_up_process,
-- 
2.37.1

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