xtensa: implement tracehook functions and enable HAVE_ARCH_TRACEHOOK
Implement syscall_get_nr, syscall_rollback, syscall_get_error,
syscall_{get,set}_return_value and syscall_{get,set}_arguments.
Select HAVE_ARCH_TRACEHOOK as Xtensa now has all support for that.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index d29b736..55d13b5 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -18,6 +18,7 @@
select GENERIC_SCHED_CLOCK
select GENERIC_STRNCPY_FROM_USER if KASAN
select HAVE_ARCH_KASAN if MMU
+ select HAVE_ARCH_TRACEHOOK
select HAVE_DEBUG_KMEMLEAK
select HAVE_DMA_CONTIGUOUS
select HAVE_EXIT_THREAD
diff --git a/arch/xtensa/include/asm/syscall.h b/arch/xtensa/include/asm/syscall.h
index 6969956..e47470e 100644
--- a/arch/xtensa/include/asm/syscall.h
+++ b/arch/xtensa/include/asm/syscall.h
@@ -10,6 +10,8 @@
#ifndef _ASM_SYSCALL_H
#define _ASM_SYSCALL_H
+#include <linux/err.h>
+#include <asm/ptrace.h>
#include <uapi/linux/audit.h>
static inline int syscall_get_arch(void)
@@ -17,7 +19,83 @@ static inline int syscall_get_arch(void)
return AUDIT_ARCH_XTENSA;
}
-struct pt_regs;
+static inline long syscall_get_nr(struct task_struct *task,
+ struct pt_regs *regs)
+{
+ return regs->syscall;
+}
+
+static inline void syscall_rollback(struct task_struct *task,
+ struct pt_regs *regs)
+{
+ /* Do nothing. */
+}
+
+static inline long syscall_get_error(struct task_struct *task,
+ struct pt_regs *regs)
+{
+ /* 0 if syscall succeeded, otherwise -Errorcode */
+ 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 void syscall_set_return_value(struct task_struct *task,
+ struct pt_regs *regs,
+ int error, long val)
+{
+ regs->areg[0] = (long) error ? error : val;
+}
+
+#define SYSCALL_MAX_ARGS 6
+#define XTENSA_SYSCALL_ARGUMENT_REGS {6, 3, 4, 5, 8, 9}
+
+static inline void syscall_get_arguments(struct task_struct *task,
+ struct pt_regs *regs,
+ unsigned int i, unsigned int n,
+ unsigned long *args)
+{
+ static const unsigned int reg[] = XTENSA_SYSCALL_ARGUMENT_REGS;
+ unsigned int j;
+
+ if (n == 0)
+ return;
+
+ WARN_ON_ONCE(i + n > SYSCALL_MAX_ARGS);
+
+ for (j = 0; j < n; ++j) {
+ if (i + j < SYSCALL_MAX_ARGS)
+ args[j] = regs->areg[reg[i + j]];
+ else
+ args[j] = 0;
+ }
+}
+
+static inline void syscall_set_arguments(struct task_struct *task,
+ struct pt_regs *regs,
+ unsigned int i, unsigned int n,
+ const unsigned long *args)
+{
+ static const unsigned int reg[] = XTENSA_SYSCALL_ARGUMENT_REGS;
+ unsigned int j;
+
+ if (n == 0)
+ return;
+
+ if (WARN_ON_ONCE(i + n > SYSCALL_MAX_ARGS)) {
+ if (i < SYSCALL_MAX_ARGS)
+ n = SYSCALL_MAX_ARGS - i;
+ else
+ return;
+ }
+
+ for (j = 0; j < n; ++j)
+ regs->areg[reg[i + j]] = args[j];
+}
asmlinkage long xtensa_rt_sigreturn(struct pt_regs*);
asmlinkage long xtensa_shmat(int, char __user *, int);