linux-kernel - [PATCH 06/13 v3] arc: define syscall_get

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Date:   Sat, 10 Nov 2018 02:54:26 +0300
From:   "Dmitry V. Levin" <ldv@...linux.org>
To:     Vineet Gupta <vineet.gupta1@...opsys.com>,
        Andrew Lutomirski <luto@...nel.org>,
        Alexey Brodkin <alexey.brodkin@...opsys.com>
Cc:     Elvira Khabirova <lineprinter@...linux.org>,
        Paul Moore <paul@...l-moore.com>,
        Eric Paris <eparis@...hat.com>,
        linux-snps-arc@...ts.infradead.org, linux-audit@...hat.com,
        linux-kernel@...r.kernel.org
Subject: [PATCH 06/13 v3] arc: define syscall_get_arch()

syscall_get_arch() is required to be implemented on all architectures
that use tracehook_report_syscall_entry() in order to extend
the generic ptrace API with PTRACE_GET_SYSCALL_INFO request.

Signed-off-by: Dmitry V. Levin <ldv@...linux.org>
---
v3: replaced #ifdefs with IS_ENABLED,
    made LE as default, added BE suffixes variants
v2: defined AUDIT_ARCH_ARCOMPACT, AUDIT_ARCH_ARCOMPACTLE, AUDIT_ARCH_ARCV2,
    and AUDIT_ARCH_ARCV2LE instead of AUDIT_ARCH_ARC,
    updated syscall_get_arch() implementation accordingly.

 arch/arc/include/asm/syscall.h | 10 ++++++++++
 include/uapi/linux/audit.h     |  4 ++++
 2 files changed, 14 insertions(+)

diff --git a/arch/arc/include/asm/syscall.h b/arch/arc/include/asm/syscall.h
index 29de09804306..10b2e7523bc8 100644
--- a/arch/arc/include/asm/syscall.h
+++ b/arch/arc/include/asm/syscall.h
@@ -9,6 +9,7 @@
 #ifndef _ASM_ARC_SYSCALL_H
 #define _ASM_ARC_SYSCALL_H  1
 
+#include <uapi/linux/audit.h>
 #include <linux/err.h>
 #include <linux/sched.h>
 #include <asm/unistd.h>
@@ -68,4 +69,13 @@ syscall_get_arguments(struct task_struct *task, struct pt_regs *regs,
 	}
 }
 
+static inline int syscall_get_arch(void)
+{
+	return IS_ENABLED(CONFIG_ISA_ARCOMPACT)
+		? (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN)
+			? AUDIT_ARCH_ARCOMPACTBE : AUDIT_ARCH_ARCOMPACT)
+		: (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN)
+			? AUDIT_ARCH_ARCV2BE : AUDIT_ARCH_ARCV2);
+}
+
 #endif
diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h
index 818ae690ab79..bedf3bf54c3a 100644
--- a/include/uapi/linux/audit.h
+++ b/include/uapi/linux/audit.h
@@ -375,6 +375,10 @@ enum {
 
 #define AUDIT_ARCH_AARCH64	(EM_AARCH64|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
 #define AUDIT_ARCH_ALPHA	(EM_ALPHA|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
+#define AUDIT_ARCH_ARCOMPACT	(EM_ARCOMPACT|__AUDIT_ARCH_LE)
+#define AUDIT_ARCH_ARCOMPACTBE	(EM_ARCOMPACT)
+#define AUDIT_ARCH_ARCV2	(EM_ARCV2|__AUDIT_ARCH_LE)
+#define AUDIT_ARCH_ARCV2BE	(EM_ARCV2)
 #define AUDIT_ARCH_ARM		(EM_ARM|__AUDIT_ARCH_LE)
 #define AUDIT_ARCH_ARMEB	(EM_ARM)
 #define AUDIT_ARCH_CRIS		(EM_CRIS|__AUDIT_ARCH_LE)
-- 
ldv