linux-kernel - Re: [PATCH 12/13 v2] riscv: define syscall_get

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Date:   Sun, 11 Nov 2018 13:21:24 -0800 (PST)
From:   Palmer Dabbelt <palmer@...ive.com>
To:     ldv@...linux.org
CC:     luto@...nel.org, lineprinter@...linux.org,
        david.abdurachmanov@...il.com, aou@...s.berkeley.edu,
        paul@...l-moore.com, eparis@...hat.com,
        linux-riscv@...ts.infradead.org, linux-audit@...hat.com,
        linux-kernel@...r.kernel.org
Subject:     Re: [PATCH 12/13 v2] riscv: define syscall_get_arch()

On Fri, 09 Nov 2018 14:48:33 PST (-0800), ldv@...linux.org wrote:
> syscall_get_arch() is required to be implemented on all architectures
> that use tracehook_report_syscall_entry() in order to extend
> the generic ptrace API with PTRACE_GET_SYSCALL_INFO request.
>
> Based-on-patch-by: David Abdurachmanov <david.abdurachmanov@...il.com>
> Signed-off-by: Dmitry V. Levin <ldv@...linux.org>
> ---
>  arch/riscv/include/asm/syscall.h | 10 ++++++++++
>  include/uapi/linux/audit.h       |  2 ++
>  2 files changed, 12 insertions(+)
>
> diff --git a/arch/riscv/include/asm/syscall.h b/arch/riscv/include/asm/syscall.h
> index 8d25f8904c00..bba3da6ef157 100644
> --- a/arch/riscv/include/asm/syscall.h
> +++ b/arch/riscv/include/asm/syscall.h
> @@ -18,6 +18,7 @@
>  #ifndef _ASM_RISCV_SYSCALL_H
>  #define _ASM_RISCV_SYSCALL_H
>
> +#include <uapi/linux/audit.h>
>  #include <linux/sched.h>
>  #include <linux/err.h>
>
> @@ -99,4 +100,13 @@ static inline void syscall_set_arguments(struct task_struct *task,
>  	memcpy(&regs->a1 + i * sizeof(regs->a1), args, n * sizeof(regs->a0));
>  }
>
> +static inline int syscall_get_arch(void)
> +{
> +#ifdef CONFIG_64BIT
> +	return AUDIT_ARCH_RISCV64;
> +#else
> +	return AUDIT_ARCH_RISCV32;
> +#endif
> +}
> +
>  #endif	/* _ASM_RISCV_SYSCALL_H */
> diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h
> index c4c8b131af48..1b199a77a6b9 100644
> --- a/include/uapi/linux/audit.h
> +++ b/include/uapi/linux/audit.h
> @@ -405,6 +405,8 @@ enum {
>  /* do not define AUDIT_ARCH_PPCLE since it is not supported by audit */
>  #define AUDIT_ARCH_PPC64	(EM_PPC64|__AUDIT_ARCH_64BIT)
>  #define AUDIT_ARCH_PPC64LE	(EM_PPC64|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
> +#define AUDIT_ARCH_RISCV32	(EM_RISCV|__AUDIT_ARCH_LE)
> +#define AUDIT_ARCH_RISCV64	(EM_RISCV|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
>  #define AUDIT_ARCH_S390		(EM_S390)
>  #define AUDIT_ARCH_S390X	(EM_S390|__AUDIT_ARCH_64BIT)
>  #define AUDIT_ARCH_SH		(EM_SH)

Reviewed-by: Palmer Dabbelt <palmer@...ive.com>

Thanks!