Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 4adeefe1 authored by Vineet Gupta's avatar Vineet Gupta
Browse files

ARC: Syscall support (no-legacy-syscall ABI) 



This includes support for generic clone/for/vfork/execve

Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
parent 054419ed

arch/arc/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -9,6 +9,7 @@ 
config ARC

	def_bool y

	select ARCH_NO_VIRT_TO_BUS

	select CLONE_BACKWARDS

	# ARC Busybox based initramfs absolutely relies on DEVTMPFS for /dev

	select DEVTMPFS if !INITRAMFS_SOURCE=""

	select GENERIC_ATOMIC64

arch/arc/include/asm/ptrace.h

+5 −0
Original line number Diff line number Diff line
@@ -86,6 +86,11 @@ struct callee_regs { 
		sp = -1;	\

	sp;			\

})



/* return 1 if in syscall, 0 if Intr or Exception */

#define in_syscall(regs) (((regs->orig_r8) >= 0 && \

			   (regs->orig_r8 <= NR_syscalls)) ? 1 : 0)



#endif /* !__ASSEMBLY__ */



#endif /* __KERNEL__ */

arch/arc/include/asm/syscall.h

0 → 100644
+72 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */



#ifndef _ASM_ARC_SYSCALL_H

#define _ASM_ARC_SYSCALL_H  1



#include <linux/err.h>

#include <linux/sched.h>

#include <asm/unistd.h>

#include <asm/ptrace.h>		/* in_syscall() */



static inline long

syscall_get_nr(struct task_struct *task, struct pt_regs *regs)

{

	if (user_mode(regs) && in_syscall(regs))

		return regs->orig_r8;

	else

		return -1;

}



static inline void

syscall_rollback(struct task_struct *task, struct pt_regs *regs)

{

	/* XXX: I can't fathom how pt_regs->r8 will be clobbered ? */

	regs->r8 = regs->orig_r8;

}



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->r0) ? regs->r0 : 0;

}



static inline long

syscall_get_return_value(struct task_struct *task, struct pt_regs *regs)

{

	return regs->r0;

}



static inline void

syscall_set_return_value(struct task_struct *task, struct pt_regs *regs,

			 int error, long val)

{

	regs->r0 = (long) error ?: val;

}



/*

 * @i:      argument index [0,5]

 * @n:      number of arguments; n+i must be [1,6].

 */

static inline void

syscall_get_arguments(struct task_struct *task, struct pt_regs *regs,

		      unsigned int i, unsigned int n, unsigned long *args)

{

	unsigned long *inside_ptregs = &(regs->r0);

	inside_ptregs -= i;



	BUG_ON((i + n) > 6);



	while (n--) {

		args[i++] = (*inside_ptregs);

		inside_ptregs--;

	}

}



#endif

arch/arc/include/asm/syscalls.h

0 → 100644
+29 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */



#ifndef _ASM_ARC_SYSCALLS_H

#define _ASM_ARC_SYSCALLS_H  1



#ifdef __KERNEL__



#include <linux/compiler.h>

#include <linux/linkage.h>

#include <linux/types.h>



int sys_clone_wrapper(int, int, int, int, int);

int sys_fork_wrapper(void);

int sys_vfork_wrapper(void);

int sys_cacheflush(uint32_t, uint32_t uint32_t);

int sys_arc_settls(void *);

int sys_arc_gettls(void);



#include <asm-generic/syscalls.h>



#endif	/* __KERNEL__ */



#endif

arch/arc/include/asm/unistd.h

0 → 100644
+34 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */



/******** no-legacy-syscalls-ABI *******/



#define __ARCH_WANT_SYS_EXECVE

#define __ARCH_WANT_SYS_CLONE

#define __ARCH_WANT_SYS_VFORK

#define __ARCH_WANT_SYS_FORK



#define sys_mmap2 sys_mmap_pgoff



#include <asm-generic/unistd.h>



#define NR_syscalls	__NR_syscalls



/* ARC specific syscall */

#define __NR_cacheflush		(__NR_arch_specific_syscall + 0)

#define __NR_arc_settls		(__NR_arch_specific_syscall + 1)

#define __NR_arc_gettls		(__NR_arch_specific_syscall + 2)



__SYSCALL(__NR_cacheflush, sys_cacheflush)

__SYSCALL(__NR_arc_settls, sys_arc_settls)

__SYSCALL(__NR_arc_gettls, sys_arc_gettls)





/* Generic syscall (fs/filesystems.c - lost in asm-generic/unistd.h */

#define __NR_sysfs		(__NR_arch_specific_syscall + 3)

__SYSCALL(__NR_sysfs, sys_sysfs)