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

From: Song Shuai
Date: Wed Jan 11 2023 - 04:54:06 EST

<guoren@xxxxxxxxxx> 于2023年1月7日周六 13:36写道：
>
> 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>
> ---
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
>


--
Thanks,
Song