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 all 5 syscall_get_* functions on xtensa 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: Max Filippov <jcmvb...@gmail.com>
Cc: Oleg Nesterov <o...@redhat.com>
Cc: Andy Lutomirski <l...@kernel.org>
Cc: Elvira Khabirova <lineprin...@altlinux.org>
Cc: Eugene Syromyatnikov <e...@redhat.com>
Cc: Chris Zankel <ch...@zankel.net>
Cc: Paul Moore <p...@paul-moore.com>
Cc: Eric Paris <epa...@redhat.com>
Cc: linux-xte...@linux-xtensa.org
Cc: linux-audit@redhat.com
Signed-off-by: Dmitry V. Levin <l...@altlinux.org>
---
Notes:
v6: there is a tracehook support in xtensa tree where all syscall_get_*
functions are implemented already, no need to pay attention at this
patch
v5: added syscall_get_nr, syscall_get_arguments, syscall_get_error,
and syscall_get_return_value
v2: added Acked-by
v1: added syscall_get_arch
arch/xtensa/include/asm/syscall.h | 65 +++++++++++++++++++++++++++++++
include/uapi/linux/audit.h | 1 +
2 files changed, 66 insertions(+)
diff --git a/arch/xtensa/include/asm/syscall.h
b/arch/xtensa/include/asm/syscall.h
index 3673ff1f1bc5..40c6de062ac8 100644
--- a/arch/xtensa/include/asm/syscall.h
+++ b/arch/xtensa/include/asm/syscall.h
@@ -8,6 +8,71 @@
* Copyright (C) 2001 - 2007 Tensilica Inc.
*/
+#include <linux/err.h>
+#include <uapi/linux/audit.h>
+#include <asm/ptrace.h>
+#include <asm-generic/syscall.h>
+
+static inline int
+syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
+{
+ return regs->syscall;
+}
+
+static inline void
+__syscall_get_arguments(struct task_struct *task, struct pt_regs *regs,
+ unsigned int i, unsigned int n, unsigned long *args)
+{
+ switch (i) {
+ case 0:
+ if (!n--)
+ break;
+ *args++ = regs->areg[6];
+ /* fall through */
+ case 1:
+ if (!n--)
+ break;
+ *args++ = regs->areg[3];
+ /* fall through */
+ case 2:
+ if (!n--)
+ break;
+ *args++ = regs->areg[4];
+ /* fall through */
+ case 3:
+ if (!n--)
+ break;
+ *args++ = regs->areg[5];
+ /* fall through */
+ case 4:
+ if (!n--)
+ break;
+ *args++ = regs->areg[8];
+ /* fall through */
+ case 5:
+ if (!n--)
+ break;
+ *args++ = regs->areg[9];
+ }
+}
+
+static inline long
+syscall_get_error(struct task_struct *task, struct pt_regs *regs)
+{
+ return IS_ERR_VALUE(regs->areg[2]) ? regs->areg[2] : 0;
+
+static inline long
+syscall_get_return_value(struct task_struct *task, struct pt_regs *regs)
+{
+ return regs->areg[2];
+}
+
+static inline int
+syscall_get_arch(void)
+{
+ return AUDIT_ARCH_XTENSA;
+}
+
struct pt_regs;
asmlinkage long xtensa_ptrace(long, long, long, long);
asmlinkage long xtensa_sigreturn(struct pt_regs*);
diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h
index 1e9808f3a240..bcc0619b046f 100644
--- a/include/uapi/linux/audit.h
+++ b/include/uapi/linux/audit.h
@@ -425,6 +425,7 @@ enum {
#define AUDIT_ARCH_TILEGX32 (EM_TILEGX|__AUDIT_ARCH_LE)
#define AUDIT_ARCH_TILEPRO (EM_TILEPRO|__AUDIT_ARCH_LE)
#define AUDIT_ARCH_X86_64 (EM_X86_64|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
+#define AUDIT_ARCH_XTENSA (EM_XTENSA)
#define AUDIT_PERM_EXEC 1
#define AUDIT_PERM_WRITE 2
--
ldv
--
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