1/*
  2 * This file is subject to the terms and conditions of the GNU General Public
  3 * License.  See the file "COPYING" in the main directory of this archive
  4 * for more details.
  5 *
  6 * Copyright (C) 1995, 96, 97, 98, 99, 2000, 01, 02 by Ralf Baechle
  7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
  8 * Copyright (C) 2001 MIPS Technologies, Inc.
  9 */
 10#include <linux/errno.h>
 11#include <asm/asm.h>
 12#include <asm/asmmacro.h>
 13#include <asm/irqflags.h>
 14#include <asm/mipsregs.h>
 15#include <asm/regdef.h>
 16#include <asm/stackframe.h>
 17#include <asm/asm-offsets.h>
 18#include <asm/sysmips.h>
 19#include <asm/thread_info.h>
 20#include <asm/unistd.h>
 21#include <asm/war.h>
 22
 23#ifndef CONFIG_BINFMT_ELF32
 24/* Neither O32 nor N32, so define handle_sys here */
 25#define handle_sys64 handle_sys
 26#endif
 27
 28	.align	5
 29NESTED(handle_sys64, PT_SIZE, sp)
 30#if !defined(CONFIG_MIPS32_O32) && !defined(CONFIG_MIPS32_N32)
 31	/*
 32	 * When 32-bit compatibility is configured scall_o32.S
 33	 * already did this.
 34	 */
 35	.set	noat
 36	SAVE_SOME
 37	TRACE_IRQS_ON_RELOAD
 38	STI
 39	.set	at
 40#endif
 41
 42#if !defined(CONFIG_MIPS32_O32) && !defined(CONFIG_MIPS32_N32)
 43	ld	t1, PT_EPC(sp)		# skip syscall on return
 44	daddiu	t1, 4			# skip to next instruction
 45	sd	t1, PT_EPC(sp)
 46#endif
 47
 48	sd	a3, PT_R26(sp)		# save a3 for syscall restarting
 49
 50	li	t1, _TIF_WORK_SYSCALL_ENTRY
 51	LONG_L	t0, TI_FLAGS($28)	# syscall tracing enabled?
 52	and	t0, t1, t0
 53	bnez	t0, syscall_trace_entry
 54
 55syscall_common:
 56	dsubu	t2, v0, __NR_64_Linux
 57	sltiu   t0, t2, __NR_64_Linux_syscalls
 58	beqz	t0, illegal_syscall
 59
 60	dsll	t0, t2, 3		# offset into table
 61	dla	t2, sys_call_table
 62	daddu	t0, t2, t0
 63	ld	t2, (t0)		# syscall routine
 64	beqz	t2, illegal_syscall
 65
 66	jalr	t2			# Do The Real Thing (TM)
 67
 68	li	t0, -EMAXERRNO - 1	# error?
 69	sltu	t0, t0, v0
 70	sd	t0, PT_R7(sp)		# set error flag
 71	beqz	t0, 1f
 72
 73	ld	t1, PT_R2(sp)		# syscall number
 74	dnegu	v0			# error
 75	sd	t1, PT_R0(sp)		# save it for syscall restarting
 761:	sd	v0, PT_R2(sp)		# result
 77
 78n64_syscall_exit:
 79	j	syscall_exit_partial
 80
 81/* ------------------------------------------------------------------------ */
 82
 83syscall_trace_entry:
 84	SAVE_STATIC
 85	move	a0, sp
 86	move	a1, v0
 87	jal	syscall_trace_enter
 88
 89	bltz	v0, 1f			# seccomp failed? Skip syscall
 90
 91	RESTORE_STATIC
 92	ld	v0, PT_R2(sp)		# Restore syscall (maybe modified)
 93	ld	a0, PT_R4(sp)		# Restore argument registers
 94	ld	a1, PT_R5(sp)
 95	ld	a2, PT_R6(sp)
 96	ld	a3, PT_R7(sp)
 97	ld	a4, PT_R8(sp)
 98	ld	a5, PT_R9(sp)
 99	j	syscall_common
100
1011:	j	syscall_exit
102
103illegal_syscall:
104	/* This also isn't a 64-bit syscall, throw an error.  */
105	li	v0, ENOSYS			# error
106	sd	v0, PT_R2(sp)
107	li	t0, 1				# set error flag
108	sd	t0, PT_R7(sp)
109	j	n64_syscall_exit
110	END(handle_sys64)
111
112#define __SYSCALL(nr, entry)	PTR entry
113	.align	3
114	.type	sys_call_table, @object
115EXPORT(sys_call_table)
116#include <asm/syscall_table_64_n64.h>
117#undef __SYSCALL