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

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
......@@ -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
......
......@@ -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__ */
......
/*
* 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
/*
* 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
/*
* 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)
......@@ -569,3 +569,30 @@ ARC_ENTRY ret_from_fork
bl @schedule_tail
b @ret_from_exception
ARC_EXIT ret_from_fork
;################### Special Sys Call Wrappers ##########################
; TBD: call do_fork directly from here
ARC_ENTRY sys_fork_wrapper
SAVE_CALLEE_SAVED_USER
bl @sys_fork
DISCARD_CALLEE_SAVED_USER
b ret_from_system_call
ARC_EXIT sys_fork_wrapper
ARC_ENTRY sys_vfork_wrapper
SAVE_CALLEE_SAVED_USER
bl @sys_vfork
DISCARD_CALLEE_SAVED_USER
b ret_from_system_call
ARC_EXIT sys_vfork_wrapper
ARC_ENTRY sys_clone_wrapper
SAVE_CALLEE_SAVED_USER
bl @sys_clone
DISCARD_CALLEE_SAVED_USER
b ret_from_system_call
ARC_EXIT sys_clone_wrapper
/*
* 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.
*
* Amit Bhor, Kanika Nema: Codito Technologies 2004
*/
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/syscalls.h>
#include <linux/elf.h>
#include <linux/tick.h>
SYSCALL_DEFINE1(arc_settls, void *, user_tls_data_ptr)
{
task_thread_info(current)->thr_ptr = (unsigned int)user_tls_data_ptr;
return 0;
}
/*
* We return the user space TLS data ptr as sys-call return code
* Ideally it should be copy to user.
* However we can cheat by the fact that some sys-calls do return
* absurdly high values
* Since the tls dat aptr is not going to be in range of 0xFFFF_xxxx
* it won't be considered a sys-call error
* and it will be loads better than copy-to-user, which is a definite
* D-TLB Miss
*/
SYSCALL_DEFINE0(arc_gettls)
{
return task_thread_info(current)->thr_ptr;
}
#include <linux/syscalls.h>
#include <linux/signal.h>
#include <linux/unistd.h>
#include <asm/syscalls.h>
#define sys_clone sys_clone_wrapper
#define sys_fork sys_fork_wrapper
#define sys_vfork sys_vfork_wrapper
#undef __SYSCALL
#define __SYSCALL(nr, call) [nr] = (call),
void *sys_call_table[NR_syscalls] = {
[0 ... NR_syscalls-1] = sys_ni_syscall,
#include <asm/unistd.h>
};
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