1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
|
/*
* 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
#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
sd a3, PT_R26(sp) # save a3 for syscall restarting
li t1, _TIF_WORK_SYSCALL_ENTRY
LONG_L t0, TI_FLAGS($28) # syscall tracing enabled?
and t0, t1, t0
bnez t0, syscall_trace_entry
syscall_common:
dsubu t2, v0, __NR_64_Linux
sltiu t0, t2, __NR_64_Linux_syscalls
beqz t0, illegal_syscall
dsll t0, t2, 3 # offset into table
dla t2, sys_call_table
daddu t0, t2, t0
ld t2, (t0) # syscall routine
beqz t2, illegal_syscall
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
ld t1, PT_R2(sp) # syscall number
dnegu v0 # error
sd t1, PT_R0(sp) # save it for syscall restarting
1: sd v0, PT_R2(sp) # result
n64_syscall_exit:
j syscall_exit_partial
/* ------------------------------------------------------------------------ */
syscall_trace_entry:
SAVE_STATIC
move a0, sp
move a1, v0
jal syscall_trace_enter
bltz v0, 1f # seccomp failed? Skip syscall
RESTORE_STATIC
ld v0, PT_R2(sp) # Restore syscall (maybe modified)
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)
j syscall_common
1: 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)
#define __SYSCALL(nr, entry) PTR entry
.align 3
.type sys_call_table, @object
EXPORT(sys_call_table)
#include <asm/syscall_table_64_n64.h>
#undef __SYSCALL
|
