xtensa: implement tracehook functions and enable HAVE_ARCH_TRACEHOOK (9f24f3c1) · Commits · 戴 / test

arch/xtensa/Kconfig

+1 −0

Original line number	Diff line number	Diff line
		@@ -18,6 +18,7 @@ config XTENSA
		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

arch/xtensa/include/asm/syscall.h

+79 −1

Original line number	Diff line number	Diff line
		@@ -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);

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