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



--
Thanks,
Song

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