[PATCH v7 17/22] riscv: define syscall_get_arch()

From: Dmitry V. Levin
Date: Sun Jan 06 2019 - 21:54:31 EST

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.

Based-on-patch-by: David Abdurachmanov <david.abdurachmanov@xxxxxxxxx>
Reviewed-by: Palmer Dabbelt <palmer@xxxxxxxxxx>
Acked-by: Paul Moore <paul@xxxxxxxxxxxxxx>
Cc: Elvira Khabirova <lineprinter@xxxxxxxxxxxx>
Cc: Eugene Syromyatnikov <esyr@xxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Albert Ou <aou@xxxxxxxxxxxxxxxxx>
Cc: Eric Paris <eparis@xxxxxxxxxx>
Cc: linux-riscv@xxxxxxxxxxxxxxxxxxx
Cc: linux-audit@xxxxxxxxxx
Signed-off-by: Dmitry V. Levin <ldv@xxxxxxxxxxxx>

v7: added Acked-by
v6: unchanged
v5: added Cc
v2: added Reviewed-by

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 @@

+#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;
+ return AUDIT_ARCH_RISCV32;
#endif /* _ASM_RISCV_SYSCALL_H */
diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h
index efeb0bbd6c4d..bcc0619b046f 100644
--- a/include/uapi/linux/audit.h
+++ b/include/uapi/linux/audit.h
@@ -411,6 +411,8 @@ enum {
/* do not define AUDIT_ARCH_PPCLE since it is not supported by audit */
#define AUDIT_ARCH_S390 (EM_S390)
#define AUDIT_ARCH_S390X (EM_S390|__AUDIT_ARCH_64BIT)