path: root/arch/mips/kernel/scall64-64.S

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1995, 96, 97, 98, 99, 2000, 01, 02 by Ralf Baechle
 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
 * Copyright (C) 2001 MIPS Technologies, Inc.
 */
#include <linux/errno.h>
#include <asm/asm.h>
#include <asm/asmmacro.h>
#include <asm/irqflags.h>
#include <asm/mipsregs.h>
#include <asm/regdef.h>
#include <asm/stackframe.h>
#include <asm/asm-offsets.h>
#include <asm/sysmips.h>
#include <asm/thread_info.h>
#include <asm/unistd.h>
#include <asm/war.h>

#ifndef CONFIG_BINFMT_ELF32
/* Neither O32 nor N32, so define handle_sys here */
#define handle_sys64 handle_sys
#endif

	.align  5
NESTED(handle_sys64, PT_SIZE, sp)
#if !defined(CONFIG_MIPS32_O32) && !defined(CONFIG_MIPS32_N32)
	/*
	 * When 32-bit compatibility is configured scall_o32.S
	 * already did this.
	 */
	.set	noat
	SAVE_SOME
	TRACE_IRQS_ON_RELOAD
	STI
	.set	at
#endif

	dsubu	t0, v0, __NR_64_Linux	# check syscall number
	sltiu	t0, t0,	__NR_64_Linux_syscalls + 1
#if !defined(CONFIG_MIPS32_O32) && !defined(CONFIG_MIPS32_N32)
	ld	t1, PT_EPC(sp)		# skip syscall on return
	daddiu	t1, 4			# skip to next instruction
	sd	t1, PT_EPC(sp)
#endif
	beqz	t0, illegal_syscall

	dsll	t0, v0, 3		# offset into table
	ld	t2, (sys_call_table - (__NR_64_Linux * 8))(t0)
					# syscall routine

	sd	a3, PT_R26(sp)		# save a3 for syscall restarting

	li	t1, _TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT
	LONG_L	t0, TI_FLAGS($28)	# syscall tracing enabled?
	and	t0, t1, t0
	bnez	t0, syscall_trace_entry

	jalr	t2			# Do The Real Thing (TM)

	li	t0, -EMAXERRNO - 1	# error?
	sltu	t0, t0, v0
	sd	t0, PT_R7(sp)		# set error flag
	beqz	t0, 1f

	dnegu	v0			# error
	sd	v0, PT_R0(sp)		# set flag for syscall
					# restarting
1:	sd	v0, PT_R2(sp)		# result

n64_syscall_exit:
	local_irq_disable		# make sure need_resched and
					# signals dont change between
					# sampling and return
	LONG_L	a2, TI_FLAGS($28)	# current->work
	li	t0, _TIF_ALLWORK_MASK
	and	t0, a2, t0
	bnez	t0, n64_syscall_exit_work

	j	restore_partial

n64_syscall_exit_work:
	j	syscall_exit_work_partial

/* ------------------------------------------------------------------------ */

syscall_trace_entry:
	SAVE_STATIC
	move	s0, t2
	move	a0, sp
	li	a1, 0
	jal	do_syscall_trace

	move	t0, s0
	RESTORE_STATIC
	ld	a0, PT_R4(sp)		# Restore argument registers
	ld	a1, PT_R5(sp)
	ld	a2, PT_R6(sp)
	ld	a3, PT_R7(sp)
	ld	a4, PT_R8(sp)
	ld	a5, PT_R9(sp)
	jalr	t0

	li	t0, -EMAXERRNO - 1	# error?
	sltu	t0, t0, v0
	sd	t0, PT_R7(sp)		# set error flag
	beqz	t0, 1f

	dnegu	v0			# error
	sd	v0, PT_R0(sp)		# set flag for syscall restarting
1:	sd	v0, PT_R2(sp)		# result

	j	syscall_exit

illegal_syscall:
	/* This also isn't a 64-bit syscall, throw an error.  */
	li	v0, -ENOSYS			# error
	sd	v0, PT_R2(sp)
	li	t0, 1				# set error flag
	sd	t0, PT_R7(sp)
	j	n64_syscall_exit
	END(handle_sys64)

	LEAF(mips_atomic_set)
	andi	v0, a1, 3			# must be word aligned
	bnez	v0, bad_alignment

	LONG_L	v1, TI_ADDR_LIMIT($28)		# in legal address range?
	LONG_ADDIU	a0, a1, 4
	or	a0, a0, a1
	and	a0, a0, v1
	bltz	a0, bad_address

#ifdef CONFIG_CPU_HAS_LLSC
	/* Ok, this is the ll/sc case.  World is sane :-)  */
1:	ll	v0, (a1)
	move	a0, a2
2:	sc	a0, (a1)
#if R10000_LLSC_WAR
	beqzl	a0, 1b
#else
	beqz	a0, 1b
#endif

	.section __ex_table,"a"
	PTR	1b, bad_stack
	PTR	2b, bad_stack
	.previous
#else
	sw	a1, 16(sp)
	sw	a2, 20(sp)

	move	a0, sp
	move	a2, a1
	li	a1, 1
	jal	do_page_fault

	lw	a1, 16(sp)
	lw	a2, 20(sp)

	/*
	 * At this point the page should be readable and writable unless
	 * there was no more memory available.
	 */
1:	lw	v0, (a1)
2:	sw	a2, (a1)

	.section __ex_table,"a"
	PTR	1b, no_mem
	PTR	2b, no_mem
	.previous
#endif

	sd	zero, PT_R7(sp)		# success
	sd	v0, PT_R2(sp)		# result

	j	n64_syscall_exit	# continue like a normal syscall

no_mem:	li	v0, -ENOMEM
	jr	ra

bad_address:
	li	v0, -EFAULT
	jr	ra

bad_alignment:
	li	v0, -EINVAL
	jr	ra
	END(mips_atomic_set)

	LEAF(sys_sysmips)
	beq	a0, MIPS_ATOMIC_SET, mips_atomic_set
	j	_sys_sysmips
	END(sys_sysmips)

	.align	3
sys_call_table:
	PTR	sys_read			/* 5000 */
	PTR	sys_write
	PTR	sys_open
	PTR	sys_close
	PTR	sys_newstat
	PTR	sys_newfstat			/* 5005 */
	PTR	sys_newlstat
	PTR	sys_poll
	PTR	sys_lseek
	PTR	old_mmap
	PTR	sys_mprotect			/* 5010 */
	PTR	sys_munmap
	PTR	sys_brk
	PTR	sys_rt_sigaction
	PTR	sys_rt_sigprocmask
	PTR	sys_ioctl			/* 5015 */
	PTR	sys_pread64
	PTR	sys_pwrite64
	PTR	sys_readv
	PTR	sys_writev
	PTR	sys_access			/* 5020 */
	PTR	sys_pipe
	PTR	sys_select
	PTR	sys_sched_yield
	PTR	sys_mremap
	PTR	sys_msync			/* 5025 */
	PTR	sys_mincore
	PTR	sys_madvise
	PTR	sys_shmget
	PTR	sys_shmat
	PTR	sys_shmctl			/* 5030 */
	PTR	sys_dup
	PTR	sys_dup2
	PTR	sys_pause
	PTR	sys_nanosleep
	PTR	sys_getitimer			/* 5035 */
	PTR	sys_setitimer
	PTR	sys_alarm
	PTR	sys_getpid
	PTR	sys_sendfile64
	PTR	sys_socket			/* 5040 */
	PTR	sys_connect
	PTR	sys_accept
	PTR	sys_sendto
	PTR	sys_recvfrom
	PTR	sys_sendmsg			/* 5045 */
	PTR	sys_recvmsg
	PTR	sys_shutdown
	PTR	sys_bind
	PTR	sys_listen
	PTR	sys_getsockname			/* 5050 */
	PTR	sys_getpeername
	PTR	sys_socketpair
	PTR	sys_setsockopt
	PTR	sys_getsockopt
	PTR	sys_clone			/* 5055 */
	PTR	sys_fork
	PTR	sys_execve
	PTR	sys_exit
	PTR	sys_wait4
	PTR	sys_kill			/* 5060 */
	PTR	sys_ne