linux-kernel - [PATCH v5 13/25] m68k: add asm/syscall.h

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Date:   Mon, 10 Dec 2018 07:30:11 +0300
From:   "Dmitry V. Levin" <ldv@...linux.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Oleg Nesterov <oleg@...hat.com>,
        Andy Lutomirski <luto@...nel.org>
Cc:     Elvira Khabirova <lineprinter@...linux.org>,
        Eugene Syromyatnikov <esyr@...hat.com>,
        linux-m68k@...ts.linux-m68k.org, linux-kernel@...r.kernel.org
Subject: [PATCH v5 13/25] m68k: add asm/syscall.h

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 introduces asm/syscall.h on m68k implementing all 5 syscall_get_*
functions as documented in asm-generic/syscall.h: syscall_get_nr,
syscall_get_arguments, syscall_get_error, syscall_get_return_value,
and syscall_get_arch.

Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Elvira Khabirova <lineprinter@...linux.org>
Cc: Eugene Syromyatnikov <esyr@...hat.com>
Cc: linux-m68k@...ts.linux-m68k.org
Signed-off-by: Dmitry V. Levin <ldv@...linux.org>
---

Notes:
    v5: added syscall_get_nr, syscall_get_arguments, syscall_get_error,
        and syscall_get_return_value
    v1: added syscall_get_arch

 arch/m68k/include/asm/syscall.h | 39 +++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 arch/m68k/include/asm/syscall.h

diff --git a/arch/m68k/include/asm/syscall.h b/arch/m68k/include/asm/syscall.h
new file mode 100644
index 000000000000..75a24cf90620
--- /dev/null
+++ b/arch/m68k/include/asm/syscall.h
@@ -0,0 +1,39 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_M68K_SYSCALL_H
+#define _ASM_M68K_SYSCALL_H
+
+#include <uapi/linux/audit.h>
+
+static inline int
+syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
+{
+	return regs->orig_d0;
+}
+
+static inline void
+syscall_get_arguments(struct task_struct *task, struct pt_regs *regs,
+		      unsigned int i, unsigned int n, unsigned long *args)
+{
+	BUG_ON(i + n > 6);
+	memcpy(args, &regs->d1 + i, n * sizeof(args[0]));
+}
+
+static inline long
+syscall_get_error(struct task_struct *task, struct pt_regs *regs)
+{
+	return IS_ERR_VALUE(regs->d0) ? regs->d0 : 0;
+}
+
+static inline long
+syscall_get_return_value(struct task_struct *task, struct pt_regs *regs)
+{
+	return regs->d0;
+}
+
+static inline int
+syscall_get_arch(void)
+{
+	return AUDIT_ARCH_M68K;
+}
+
+#endif	/* _ASM_M68K_SYSCALL_H */
-- 
ldv