linux-kernel - [PATCH linux-next v8 3/7] mips: define syscall_get

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Date:   Fri, 22 Mar 2019 07:15:50 +0300
From:   "Dmitry V. Levin" <ldv@...linux.org>
To:     linux-kernel@...r.kernel.org
Cc:     Elvira Khabirova <lineprinter@...linux.org>,
        Eugene Syromyatnikov <esyr@...hat.com>,
        Paul Burton <paul.burton@...s.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        James Hogan <jhogan@...nel.org>,
        Oleg Nesterov <oleg@...hat.com>,
        Andy Lutomirski <luto@...nel.org>, linux-mips@...r.kernel.org
Subject: [PATCH linux-next v8 3/7] mips: define syscall_get_error()

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

Acked-by: Paul Burton <paul.burton@...s.com>
Cc: Elvira Khabirova <lineprinter@...linux.org>
Cc: Eugene Syromyatnikov <esyr@...hat.com>
Cc: Ralf Baechle <ralf@...ux-mips.org>
Cc: James Hogan <jhogan@...nel.org>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: linux-mips@...r.kernel.org
Signed-off-by: Dmitry V. Levin <ldv@...linux.org>
---

Notes:
    v8: unchanged
    v7: added Acked-by
    v6: unchanged
    v5: initial revision

 arch/mips/include/asm/syscall.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/mips/include/asm/syscall.h b/arch/mips/include/asm/syscall.h
index 6a22c9352ef6..466957d0474b 100644
--- a/arch/mips/include/asm/syscall.h
+++ b/arch/mips/include/asm/syscall.h
@@ -89,6 +89,12 @@ static inline unsigned long mips_get_syscall_arg(unsigned long *arg,
 	unreachable();
 }
 
+static inline long syscall_get_error(struct task_struct *task,
+				     struct pt_regs *regs)
+{
+	return regs->regs[7] ? -regs->regs[2] : 0;
+}
+
 static inline long syscall_get_return_value(struct task_struct *task,
 					    struct pt_regs *regs)
 {
-- 
ldv