[PATCH -next V6 7/7] samples: ftrace: Add riscv support for SAMPLE_FTRACE_DIRECT[_MULTI]

[guoren]

From: Song Shuai <suagrfillet@xxxxxxxxx>

select HAVE_SAMPLE_FTRACE_DIRECT and HAVE_SAMPLE_FTRACE_DIRECT_MULTI
for ARCH_RV64I in arch/riscv/Kconfig. And add riscv asm code for
the ftrace-direct*.c files in samples/ftrace/.

Signed-off-by: Song Shuai <suagrfillet@xxxxxxxxx>
Tested-by: Guo Ren <guoren@xxxxxxxxxx>
Signed-off-by: Guo Ren <guoren@xxxxxxxxxx>
---
 samples/ftrace/ftrace-direct-modify.c       | 33 ++++++++++++++++++
 samples/ftrace/ftrace-direct-multi-modify.c | 37 +++++++++++++++++++++
 samples/ftrace/ftrace-direct-multi.c        | 22 ++++++++++++
 samples/ftrace/ftrace-direct-too.c          | 26 +++++++++++++++
 samples/ftrace/ftrace-direct.c              | 22 ++++++++++++
 5 files changed, 140 insertions(+)

diff --git a/samples/ftrace/ftrace-direct-modify.c b/samples/ftrace/ftrace-direct-modify.c
index de5a0f67f320..be7bf472c3c7 100644
--- a/samples/ftrace/ftrace-direct-modify.c
+++ b/samples/ftrace/ftrace-direct-modify.c
@@ -23,6 +23,39 @@ extern void my_tramp2(void *);
 
 static unsigned long my_ip = (unsigned long)schedule;
 
+#ifdef CONFIG_RISCV
+
+asm ("	.pushsection    .text, \"ax\", @progbits\n"
+"	.type		my_tramp1, @function\n"
+"	.globl		my_tramp1\n"
+"   my_tramp1:\n"
+"	addi sp,sp,-16\n"
+"	sd   t0,0(sp)\n"
+"	sd   ra,8(sp)\n"
+"	call my_direct_func1\n"
+"	ld   t0,0(sp)\n"
+"	ld   ra,8(sp)\n"
+"	addi 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 sp,sp,-16\n"
+"	sd   t0,0(sp)\n"
+"	sd   ra,8(sp)\n"
+"	call my_direct_func2\n"
+"	ld   t0,0(sp)\n"
+"	ld   ra,8(sp)\n"
+"	addi sp,sp,16\n"
+"	jr t0\n"
+"	.size		my_tramp2, .-my_tramp2\n"
+"	.popsection\n"
+);
+
+#endif /* CONFIG_RISCV */
+
 #ifdef CONFIG_X86_64
 
 #include <asm/ibt.h>
diff --git a/samples/ftrace/ftrace-direct-multi-modify.c b/samples/ftrace/ftrace-direct-multi-modify.c
index d52370cad0b6..10884bf418f7 100644
--- a/samples/ftrace/ftrace-direct-multi-modify.c
+++ b/samples/ftrace/ftrace-direct-multi-modify.c
@@ -21,6 +21,43 @@ void my_direct_func2(unsigned long ip)
 extern void my_tramp1(void *);
 extern void my_tramp2(void *);
 
+#ifdef CONFIG_RISCV
+
+asm ("	.pushsection    .text, \"ax\", @progbits\n"
+"	.type		my_tramp1, @function\n"
+"	.globl		my_tramp1\n"
+"   my_tramp1:\n"
+"       addi sp,sp,-24\n"
+"       sd   a0,0(sp)\n"
+"       sd   t0,8(sp)\n"
+"       sd   ra,16(sp)\n"
+"       call my_direct_func1\n"
+"       ld   a0,0(sp)\n"
+"       ld   t0,8(sp)\n"
+"       ld   ra,16(sp)\n"
+"       addi sp,sp,24\n"
+"	jr t0\n"
+"	.size		my_tramp1, .-my_tramp1\n"
+
+"	.type		my_tramp2, @function\n"
+"	.globl		my_tramp2\n"
+"   my_tramp2:\n"
+"       addi sp,sp,-24\n"
+"       sd   a0,0(sp)\n"
+"       sd   t0,8(sp)\n"
+"       sd   ra,16(sp)\n"
+"       call my_direct_func2\n"
+"       ld   a0,0(sp)\n"
+"       ld   t0,8(sp)\n"
+"       ld   ra,16(sp)\n"
+"       addi sp,sp,24\n"
+"	jr t0\n"
+"	.size		my_tramp2, .-my_tramp2\n"
+"	.popsection\n"
+);
+
+#endif /* CONFIG_RISCV */
+
 #ifdef CONFIG_X86_64
 
 #include <asm/ibt.h>
diff --git a/samples/ftrace/ftrace-direct-multi.c b/samples/ftrace/ftrace-direct-multi.c
index ec1088922517..a35bf43bf6d7 100644
--- a/samples/ftrace/ftrace-direct-multi.c
+++ b/samples/ftrace/ftrace-direct-multi.c
@@ -16,6 +16,28 @@ void my_direct_func(unsigned long ip)
 
 extern void my_tramp(void *);
 
+#ifdef CONFIG_RISCV
+
+asm ("       .pushsection    .text, \"ax\", @progbits\n"
+"       .type           my_tramp, @function\n"
+"       .globl          my_tramp\n"
+"   my_tramp:\n"
+"       addi sp,sp,-24\n"
+"       sd   a0,0(sp)\n"
+"       sd   t0,8(sp)\n"
+"       sd   ra,16(sp)\n"
+"       call my_direct_func\n"
+"       ld   a0,0(sp)\n"
+"       ld   t0,8(sp)\n"
+"       ld   ra,16(sp)\n"
+"       addi sp,sp,24\n"
+"       jr t0\n"
+"       .size           my_tramp, .-my_tramp\n"
+"       .popsection\n"
+);
+
+#endif /* CONFIG_RISCV */
+
 #ifdef CONFIG_X86_64
 
 #include <asm/ibt.h>
diff --git a/samples/ftrace/ftrace-direct-too.c b/samples/ftrace/ftrace-direct-too.c
index e13fb59a2b47..3b62e33c2e6d 100644
--- a/samples/ftrace/ftrace-direct-too.c
+++ b/samples/ftrace/ftrace-direct-too.c
@@ -18,6 +18,32 @@ void my_direct_func(struct vm_area_struct *vma,
 
 extern void my_tramp(void *);
 
+#ifdef CONFIG_RISCV
+
+asm ("       .pushsection    .text, \"ax\", @progbits\n"
+"       .type           my_tramp, @function\n"
+"       .globl          my_tramp\n"
+"   my_tramp:\n"
+"       addi sp,sp,-40\n"
+"       sd   a0,0(sp)\n"
+"       sd   a1,8(sp)\n"
+"       sd   a2,16(sp)\n"
+"       sd   t0,24(sp)\n"
+"       sd   ra,32(sp)\n"
+"       call my_direct_func\n"
+"       ld   a0,0(sp)\n"
+"       ld   a1,8(sp)\n"
+"       ld   a2,16(sp)\n"
+"       ld   t0,24(sp)\n"
+"       ld   ra,32(sp)\n"
+"       addi sp,sp,40\n"
+"       jr t0\n"
+"       .size           my_tramp, .-my_tramp\n"
+"       .popsection\n"
+);
+
+#endif /* CONFIG_RISCV */
+
 #ifdef CONFIG_X86_64
 
 #include <asm/ibt.h>
diff --git a/samples/ftrace/ftrace-direct.c b/samples/ftrace/ftrace-direct.c
index 1f769d0db20f..2cfe5a7d2d70 100644
--- a/samples/ftrace/ftrace-direct.c
+++ b/samples/ftrace/ftrace-direct.c
@@ -15,6 +15,28 @@ void my_direct_func(struct task_struct *p)
 
 extern void my_tramp(void *);
 
+#ifdef CONFIG_RISCV
+
+asm ("       .pushsection    .text, \"ax\", @progbits\n"
+"       .type           my_tramp, @function\n"
+"       .globl          my_tramp\n"
+"   my_tramp:\n"
+"       addi sp,sp,-24\n"
+"       sd   a0,0(sp)\n"
+"       sd   t0,8(sp)\n"
+"       sd   ra,16(sp)\n"
+"       call my_direct_func\n"
+"       ld   a0,0(sp)\n"
+"       ld   t0,8(sp)\n"
+"       ld   ra,16(sp)\n"
+"       addi sp,sp,24\n"
+"       jr t0\n"
+"       .size           my_tramp, .-my_tramp\n"
+"       .popsection\n"
+);
+
+#endif /* CONFIG_RISCV */
+
 #ifdef CONFIG_X86_64
 
 #include <asm/ibt.h>
-- 
2.36.1