Re: [PATCH 2/2] samples: ftrace: Add riscv support for SAMPLE_FTRACE_DIRECT[_MULTI]

From: Guo Ren
Date: Mon Nov 28 2022 - 05:21:26 EST

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On Mon, Nov 28, 2022 at 6:12 PM <guoren@xxxxxxxxxx> wrote:
>
> 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>
> Co-developed-by: Guo Ren <guoren@xxxxxxxxxx>
> Signed-off-by: Guo Ren <guoren@xxxxxxxxxx>
> ---
> Below is modified by Guo Ren:
>
> diff --git a/samples/ftrace/ftrace-direct-modify.c
> b/samples/ftrace/ftrace-direct-modify.c
> index 5582d000d803..d970b46ecc4e 100644
> --- a/samples/ftrace/ftrace-direct-modify.c
> +++ b/samples/ftrace/ftrace-direct-modify.c
> @@ -29,6 +29,7 @@ asm (" .pushsection .text, \"ax\",
> @progbits\n"
> " .globl my_tramp1\n"
> " my_tramp1:\n"
> " addi sp,sp,-16\n"
> +" move t0,t1\n"
> " sd t0,0(sp)\n"
> " sd ra,8(sp)\n"
> " call my_direct_func1\n"
> diff --git a/samples/ftrace/ftrace-direct-multi-modify.c
> b/samples/ftrace/ftrace-direct-multi-modify.c
> index 43e02d39c652..9534e18fa6ed 100644
> --- a/samples/ftrace/ftrace-direct-multi-modify.c
> +++ b/samples/ftrace/ftrace-direct-multi-modify.c
> @@ -28,6 +28,7 @@ asm (" .pushsection .text, \"ax\",
> @progbits\n"
> " my_tramp1:\n"
> " addi sp,sp,-24\n"
> " sd a0,0(sp)\n"
> +" move t0,t1\n"
> " sd t0,8(sp)\n"
> " sd ra,16(sp)\n"
> " call my_direct_func1\n"
> diff --git a/samples/ftrace/ftrace-direct-multi.c
> b/samples/ftrace/ftrace-direct-multi.c
> index df91339d3095..2111478b0463 100644
> --- a/samples/ftrace/ftrace-direct-multi.c
> +++ b/samples/ftrace/ftrace-direct-multi.c
> @@ -23,6 +23,7 @@ asm (" .pushsection .text, \"ax\",
> @progbits\n"
> " my_tramp:\n"
> " addi sp,sp,-24\n"
> " sd a0,0(sp)\n"
> +" move t0,t1\n"
> " sd t0,8(sp)\n"
> " sd ra,16(sp)\n"
> " call my_direct_func\n"
> diff --git a/samples/ftrace/ftrace-direct-too.c
> b/samples/ftrace/ftrace-direct-too.c
> index fe3b8c4f3336..e80981d3dc0a 100644
> --- a/samples/ftrace/ftrace-direct-too.c
> +++ b/samples/ftrace/ftrace-direct-too.c
> @@ -27,6 +27,7 @@ asm (" .pushsection .text, \"ax\",
> @progbits\n"
> " sd a0,0(sp)\n"
> " sd a1,8(sp)\n"
> " sd a2,16(sp)\n"
> +" move t0,t1\n"
> " sd t0,24(sp)\n"
> " sd ra,32(sp)\n"
> " call my_direct_func\n"
> diff --git a/samples/ftrace/ftrace-direct.c
> b/samples/ftrace/ftrace-direct.c
> index 0784024b6653..b6cae1b5cb66 100644
> --- a/samples/ftrace/ftrace-direct.c
> +++ b/samples/ftrace/ftrace-direct.c
> @@ -22,6 +22,7 @@ asm (" .pushsection .text, \"ax\",
> @progbits\n"
> " my_tramp:\n"
> " addi sp,sp,-24\n"
> " sd a0,0(sp)\n"
> +" move t0,t1\n"
> " sd t0,8(sp)\n"
> " sd ra,16(sp)\n"
> " call my_direct_func\n"
> ---
> arch/riscv/Kconfig | 2 ++
> samples/ftrace/ftrace-direct-modify.c | 34 ++++++++++++++++++
> samples/ftrace/ftrace-direct-multi-modify.c | 38 +++++++++++++++++++++
> samples/ftrace/ftrace-direct-multi.c | 23 +++++++++++++
> samples/ftrace/ftrace-direct-too.c | 27 +++++++++++++++
> samples/ftrace/ftrace-direct.c | 23 +++++++++++++
> 6 files changed, 147 insertions(+)
>
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index 2828537abfcd..0a1da03e88c2 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -279,6 +279,8 @@ config ARCH_RV64I
> select HAVE_DYNAMIC_FTRACE if !XIP_KERNEL && MMU && $(cc-option,-fpatchable-function-entry=8)
> select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE
> select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
> + select HAVE_SAMPLE_FTRACE_DIRECT
> + select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
> select HAVE_FTRACE_MCOUNT_RECORD if !XIP_KERNEL
> select HAVE_FUNCTION_GRAPH_TRACER
> select HAVE_FUNCTION_TRACER if !XIP_KERNEL && !PREEMPTION
> diff --git a/samples/ftrace/ftrace-direct-modify.c b/samples/ftrace/ftrace-direct-modify.c
> index 39146fa83e20..6a633ff4cf6d 100644
> --- a/samples/ftrace/ftrace-direct-modify.c
> +++ b/samples/ftrace/ftrace-direct-modify.c
> @@ -22,6 +22,40 @@ 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"
> +" move t0,t1\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 65aa94d96f4e..9534e18fa6ed 100644
> --- a/samples/ftrace/ftrace-direct-multi-modify.c
> +++ b/samples/ftrace/ftrace-direct-multi-modify.c
> @@ -20,6 +20,44 @@ 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"
> +" move t0,t1\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"
Be care, and I missed one.
+" move t0,t1\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 41ded7c615c7..2111478b0463 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"
> +" move t0,t1\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 6690468c5cc2..e80981d3dc0a 100644
> --- a/samples/ftrace/ftrace-direct-too.c
> +++ b/samples/ftrace/ftrace-direct-too.c
> @@ -17,6 +17,33 @@ 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"
> +" move t0,t1\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 e8f1e440b9b8..b6cae1b5cb66 100644
> --- a/samples/ftrace/ftrace-direct.c
> +++ b/samples/ftrace/ftrace-direct.c
> @@ -14,6 +14,29 @@ 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"
> +" move t0,t1\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
>

--
Best Regards
Guo Ren

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