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

  From: Song Shuai <suagrfillet@gmail.com>

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@gmail.com>
Tested-by: Guo Ren <guoren@kernel.org>
Signed-off-by: Guo Ren <guoren@kernel.org>
---
 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(+)
  

On 07.01.2023 16:35, guoren@kernel.org wrote:
> From: Song Shuai <suagrfillet@gmail.com>
> 
> 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/.

This patch does not actually change arch/riscv/Kconfig. Some part is 
missing, perhaps?

> 
> Signed-off-by: Song Shuai <suagrfillet@gmail.com>
> Tested-by: Guo Ren <guoren@kernel.org>
> Signed-off-by: Guo Ren <guoren@kernel.org>
> ---
>   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
> 
> 

Regards,
Evgenii
  

On 07.01.2023 16:35, guoren@kernel.org wrote:
> From: Song Shuai <suagrfillet@gmail.com>
> 
> 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/.

The samples fail to build for RV64GC system, because asm/nospec-branch.h 
is not available for RISC-V. As of 6.2-rc3, it seems, the header is only 
present on x86 and s390.

May be, place it under #ifdef, so that it is only used where available? 
nospec functionality is not yet implemented for RISC-V and is way out of 
scope of this patch series.

> 
> Signed-off-by: Song Shuai <suagrfillet@gmail.com>
> Tested-by: Guo Ren <guoren@kernel.org>
> Signed-off-by: Guo Ren <guoren@kernel.org>
> ---
>   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
> 
> 

Regards,
Evgenii
  

<guoren@kernel.org> 于2023年1月7日周六 13:36写道：
>
> From: Song Shuai <suagrfillet@gmail.com>
>
> 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@gmail.com>
> Tested-by: Guo Ren <guoren@kernel.org>
> Signed-off-by: Guo Ren <guoren@kernel.org>
> ---
Hi,Guo && Evgenii:

As Evgenii comments, this patch has two problems to fix:

1. the modification of Kconfig is missing
So we should add it back

2. the build error resulted by including of nospec-branch.h file
This including is exclusive for x86 architecture, moving it under
x86 #ifdef seems better to fix this error

I fixed them in my GitHub repo, but I can't find a reasonable target
branch in your repo to PR.
So I paste the link of my branch here, you can pick the first 2
commits in the next series.

- samples: ftrace: Add riscv support for SAMPLE_FTRACE_DIRECT[_MULTI]
- samples: ftrace: Include the nospec-branch.h only for x86

Link: https://github.com/sugarfillet/linux/commits/song_ftrace_fix_up_v6

>  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
>
  

On Wed, Jan 11, 2023 at 5:51 PM Song Shuai <suagrfillet@gmail.com> wrote:
>
> <guoren@kernel.org> 于2023年1月7日周六 13:36写道：
> >
> > From: Song Shuai <suagrfillet@gmail.com>
> >
> > 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@gmail.com>
> > Tested-by: Guo Ren <guoren@kernel.org>
> > Signed-off-by: Guo Ren <guoren@kernel.org>
> > ---
> Hi,Guo && Evgenii:
>
> As Evgenii comments, this patch has two problems to fix:
>
> 1. the modification of Kconfig is missing
> So we should add it back
>
> 2. the build error resulted by including of nospec-branch.h file
> This including is exclusive for x86 architecture, moving it under
> x86 #ifdef seems better to fix this error
>
> I fixed them in my GitHub repo, but I can't find a reasonable target
> branch in your repo to PR.
> So I paste the link of my branch here, you can pick the first 2
> commits in the next series.
>
> - samples: ftrace: Add riscv support for SAMPLE_FTRACE_DIRECT[_MULTI]
> - samples: ftrace: Include the nospec-branch.h only for x86
Great, thx.

>
> Link: https://github.com/sugarfillet/linux/commits/song_ftrace_fix_up_v6
>
> >  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
> >
>
>
> --
> Thanks,
> Song
  

Hi,Guo:

Song Shuai <suagrfillet@gmail.com> 于2023年1月11日周三 09:50写道：
>
> <guoren@kernel.org> 于2023年1月7日周六 13:36写道：
> >
> > From: Song Shuai <suagrfillet@gmail.com>
> >
> > 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@gmail.com>
> > Tested-by: Guo Ren <guoren@kernel.org>
> > Signed-off-by: Guo Ren <guoren@kernel.org>
> > ---
> Hi,Guo && Evgenii:
>
> As Evgenii comments, this patch has two problems to fix:
>
> 1. the modification of Kconfig is missing
> So we should add it back
>
> 2. the build error resulted by including of nospec-branch.h file
> This including is exclusive for x86 architecture, moving it under
> x86 #ifdef seems better to fix this error
>
> I fixed them in my GitHub repo, but I can't find a reasonable target
> branch in your repo to PR.
> So I paste the link of my branch here, you can pick the first 2
> commits in the next series.
>
> - samples: ftrace: Add riscv support for SAMPLE_FTRACE_DIRECT[_MULTI]
> - samples: ftrace: Include the nospec-branch.h only for x86
This patch for the 2nd problem mentioned above seems to be omitted in
the V7 series.
I paste the raw patch link here. Hope you can add it in the next.

https://github.com/sugarfillet/linux/commit/9539a80dc6e7d1137ec7a96ebef2ab912a694bd7.patch
>
> Link: https://github.com/sugarfillet/linux/commits/song_ftrace_fix_up_v6
>
> >  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
> >
>
>
> --
> Thanks,
> Song
  

On Fri, Jan 13, 2023 at 6:48 PM Song Shuai <suagrfillet@gmail.com> wrote:
>
> Hi,Guo:
>
> Song Shuai <suagrfillet@gmail.com> 于2023年1月11日周三 09:50写道：
> >
> > <guoren@kernel.org> 于2023年1月7日周六 13:36写道：
> > >
> > > From: Song Shuai <suagrfillet@gmail.com>
> > >
> > > 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@gmail.com>
> > > Tested-by: Guo Ren <guoren@kernel.org>
> > > Signed-off-by: Guo Ren <guoren@kernel.org>
> > > ---
> > Hi,Guo && Evgenii:
> >
> > As Evgenii comments, this patch has two problems to fix:
> >
> > 1. the modification of Kconfig is missing
> > So we should add it back
> >
> > 2. the build error resulted by including of nospec-branch.h file
> > This including is exclusive for x86 architecture, moving it under
> > x86 #ifdef seems better to fix this error
> >
> > I fixed them in my GitHub repo, but I can't find a reasonable target
> > branch in your repo to PR.
> > So I paste the link of my branch here, you can pick the first 2
> > commits in the next series.
> >
> > - samples: ftrace: Add riscv support for SAMPLE_FTRACE_DIRECT[_MULTI]
> > - samples: ftrace: Include the nospec-branch.h only for x86
> This patch for the 2nd problem mentioned above seems to be omitted in
> the V7 series.
> I paste the raw patch link here. Hope you can add it in the next.
>
> https://github.com/sugarfillet/linux/commit/9539a80dc6e7d1137ec7a96ebef2ab912a694bd7.patch
Why do we need an x86 patchset in a riscv series? Without the patch,
what's compile error in riscv?

> >
> > Link: https://github.com/sugarfillet/linux/commits/song_ftrace_fix_up_v6
> >
> > >  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
> > >
> >
> >
> > --
> > Thanks,
> > Song
>
>
>
> --
> Thanks,
> Song