[PATCH v5 11/25] nds32: define syscall_get_arch()

[Dmitry V. Levin]

syscall_get_arch() is required to be implemented on all architectures
in addition to already implemented syscall_get_nr(),
syscall_get_arguments(), syscall_get_error(), and
syscall_get_return_value() functions in order to extend the generic
ptrace API with PTRACE_GET_SYSCALL_INFO request.

Cc: Greentime Hu <green...@gmail.com>
Cc: Vincent Chen <deanbo...@gmail.com>
Cc: Paul Moore <p...@paul-moore.com>
Cc: Eric Paris <epa...@redhat.com>
Cc: Oleg Nesterov <o...@redhat.com>
Cc: Andy Lutomirski <l...@kernel.org>
Cc: Elvira Khabirova <lineprin...@altlinux.org>
Cc: Eugene Syromyatnikov <e...@redhat.com>
Cc: linux-au...@redhat.com
Signed-off-by: Dmitry V. Levin <l...@altlinux.org>
---

Notes:
    v5: added Cc
    v2: apparently, this architecture can be configured as big-endian,
        so changed AUDIT_ARCH_NDS32 to be little-endian, and added
        AUDIT_ARCH_NDS32BE.

 arch/nds32/include/asm/syscall.h | 8 ++++++++
 include/uapi/linux/audit.h       | 2 ++
 2 files changed, 10 insertions(+)

diff --git a/arch/nds32/include/asm/syscall.h b/arch/nds32/include/asm/syscall.h
index f7e5e86765fe..569149ca25da 100644
--- a/arch/nds32/include/asm/syscall.h
+++ b/arch/nds32/include/asm/syscall.h
@@ -5,6 +5,7 @@
 #ifndef _ASM_NDS32_SYSCALL_H
 #define _ASM_NDS32_SYSCALL_H   1
 
+#include <uapi/linux/audit.h>
 #include <linux/err.h>
 struct task_struct;
 struct pt_regs;
@@ -185,4 +186,11 @@ void syscall_set_arguments(struct task_struct *task, 
struct pt_regs *regs,
 
        memcpy(&regs->uregs[0] + i, args, n * sizeof(args[0]));
 }
+
+static inline int syscall_get_arch(void)
+{
+       return IS_ENABLED(CONFIG_CPU_BIG_ENDIAN)
+               ? AUDIT_ARCH_NDS32BE : AUDIT_ARCH_NDS32;
+}
+
 #endif /* _ASM_NDS32_SYSCALL_H */
diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h
index b8e848736031..54551adb3d5d 100644
--- a/include/uapi/linux/audit.h
+++ b/include/uapi/linux/audit.h
@@ -401,6 +401,8 @@ enum {
 #define AUDIT_ARCH_MIPSEL64    (EM_MIPS|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
 #define AUDIT_ARCH_MIPSEL64N32 (EM_MIPS|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE|\
                                 __AUDIT_ARCH_CONVENTION_MIPS64_N32)
+#define AUDIT_ARCH_NDS32       (EM_NDS32|__AUDIT_ARCH_LE)
+#define AUDIT_ARCH_NDS32BE     (EM_NDS32)
 #define AUDIT_ARCH_OPENRISC    (EM_OPENRISC)
 #define AUDIT_ARCH_PARISC      (EM_PARISC)
 #define AUDIT_ARCH_PARISC64    (EM_PARISC|__AUDIT_ARCH_64BIT)
-- 
ldv