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From:   Song Shuai <suagrfillet@gmail.com>
To:     paul.walmsley@sifive.com, palmer@dabbelt.com,
        aou@eecs.berkeley.edu, rostedt@goodmis.org, mhiramat@kernel.org,
        mark.rutland@arm.com, guoren@kernel.org, e.shatokhin@yadro.com
Cc:     linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
        linux-trace-kernel@vger.kernel.org,
        Song Shuai <suagrfillet@gmail.com>
Subject: [PATCH V8 4/4] samples: ftrace: Add riscv support for SAMPLE_FTRACE_DIRECT[_MULTI]
Date:   Fri, 24 Mar 2023 11:33:42 +0800
Message-Id: <20230324033342.3177979-5-suagrfillet@gmail.com>
In-Reply-To: <20230324033342.3177979-1-suagrfillet@gmail.com>
References: <20230324033342.3177979-1-suagrfillet@gmail.com>
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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/.

Link: https://lore.kernel.org/linux-riscv/c68bac83-5c88-80b1-bac9-e1fd4ea8f07e@yadro.com/T/#ma13012560331c66b051b580b3ab4a04ba44455ec
Tested-by: Evgenii Shatokhin <e.shatokhin@yadro.com>
Signed-off-by: Song Shuai <suagrfillet@gmail.com>
Tested-by: Guo Ren <guoren@kernel.org>
Signed-off-by: Guo Ren <guoren@kernel.org>
---
 arch/riscv/Kconfig                          |  2 ++
 samples/ftrace/ftrace-direct-modify.c       | 33 +++++++++++++++++
 samples/ftrace/ftrace-direct-multi-modify.c | 39 +++++++++++++++++++++
 samples/ftrace/ftrace-direct-multi.c        | 23 ++++++++++++
 samples/ftrace/ftrace-direct-too.c          | 26 ++++++++++++++
 samples/ftrace/ftrace-direct.c              | 22 ++++++++++++
 6 files changed, 145 insertions(+)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 17052b2dc83c..5b35496ac644 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -115,6 +115,8 @@ config RISCV
 	select HAVE_POSIX_CPU_TIMERS_TASK_WORK
 	select HAVE_REGS_AND_STACK_ACCESS_API
 	select HAVE_RSEQ
+	select HAVE_SAMPLE_FTRACE_DIRECT
+	select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
 	select HAVE_STACKPROTECTOR
 	select HAVE_SYSCALL_TRACEPOINTS
 	select IRQ_DOMAIN
diff --git a/samples/ftrace/ftrace-direct-modify.c b/samples/ftrace/ftrace-direct-modify.c
index d93abbcb1f4c..32f973e7bab1 100644
--- a/samples/ftrace/ftrace-direct-modify.c
+++ b/samples/ftrace/ftrace-direct-modify.c
@@ -22,6 +22,39 @@ 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 b58c594efb51..045a4af041ce 100644
--- a/samples/ftrace/ftrace-direct-multi-modify.c
+++ b/samples/ftrace/ftrace-direct-multi-modify.c
@@ -20,6 +20,45 @@ 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"
+"       mv   a0,t0\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"
+"       mv   a0,t0\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 c27cf130c319..918cf325d3a3 100644
--- a/samples/ftrace/ftrace-direct-multi.c
+++ b/samples/ftrace/ftrace-direct-multi.c
@@ -15,6 +15,29 @@ 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"
+"       mv   a0,t0\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 8139dce2a31c..5a552b710d8c 100644
--- a/samples/ftrace/ftrace-direct-too.c
+++ b/samples/ftrace/ftrace-direct-too.c
@@ -17,6 +17,32 @@ 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 1d3d307ca33d..33e7bde013aa 100644
--- a/samples/ftrace/ftrace-direct.c
+++ b/samples/ftrace/ftrace-direct.c
@@ -14,6 +14,28 @@ 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>
-- 
2.20.1