linux-kernel - [PATCH linux-next v8 2/7] hexagon: define syscall_get_error() and syscall_get_return

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Message-ID: <20190322041539.GC27266@altlinux.org>
Date:   Fri, 22 Mar 2019 07:15:39 +0300
From:   "Dmitry V. Levin" <ldv@...linux.org>
To:     Richard Kuo <rkuo@...eaurora.org>
Cc:     Elvira Khabirova <lineprinter@...linux.org>,
        Eugene Syromyatnikov <esyr@...hat.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        linux-hexagon@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH linux-next v8 2/7] hexagon: define syscall_get_error() and
 syscall_get_return_value()

syscall_get_* functions are required to be implemented on all
architectures in order to extend the generic ptrace API with
PTRACE_GET_SYSCALL_INFO request.

This adds remaining 2 syscall_get_* functions as documented in
asm-generic/syscall.h: syscall_get_error and syscall_get_return_value.

Cc: Richard Kuo <rkuo@...eaurora.org>
Cc: Elvira Khabirova <lineprinter@...linux.org>
Cc: Eugene Syromyatnikov <esyr@...hat.com>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: linux-hexagon@...r.kernel.org
Signed-off-by: Dmitry V. Levin <ldv@...linux.org>
---

Notes:
    v8: moved syscall_get_arch to separate audit patchset
    v7: unchanged
    v6: added missing includes
    v5: added syscall_get_error and syscall_get_return_value
    v4: unchanged
    v3: unchanged
    v2: unchanged

 arch/hexagon/include/asm/syscall.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/hexagon/include/asm/syscall.h b/arch/hexagon/include/asm/syscall.h
index 47b0bc3f16be..b6a02ea3ea7f 100644
--- a/arch/hexagon/include/asm/syscall.h
+++ b/arch/hexagon/include/asm/syscall.h
@@ -22,6 +22,8 @@
 #define _ASM_HEXAGON_SYSCALL_H
 
 #include <uapi/linux/audit.h>
+#include <linux/err.h>
+#include <asm/ptrace.h>
 
 typedef long (*syscall_fn)(unsigned long, unsigned long,
 	unsigned long, unsigned long,
@@ -46,6 +48,18 @@ static inline void syscall_get_arguments(struct task_struct *task,
 	memcpy(args, &(&regs->r00)[i], n * sizeof(args[0]));
 }
 
+static inline long syscall_get_error(struct task_struct *task,
+				     struct pt_regs *regs)
+{
+	return IS_ERR_VALUE(regs->r00) ? regs->r00 : 0;
+}
+
+static inline long syscall_get_return_value(struct task_struct *task,
+					    struct pt_regs *regs)
+{
+	return regs->r00;
+}
+
 static inline int syscall_get_arch(struct task_struct *task)
 {
 	return AUDIT_ARCH_HEXAGON;
-- 
ldv