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
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
/*--------------------------------------------------------------------*/
/*--- Support for doing system calls. syscall-mips64-linux.S ---*/
/*--------------------------------------------------------------------*/
/*
This file is part of Valgrind, a dynamic binary instrumentation
framework.
Copyright (C) 2010-2017 RT-RK
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.
The GNU General Public License is contained in the file COPYING.
*/
#include "pub_core_basics_asm.h"
#if defined(VGP_mips64_linux)
#include "pub_core_vkiscnums_asm.h"
#include "libvex_guest_offsets.h"
/*----------------------------------------------------------------*/
/*
Perform a syscall for the client. This will run a syscall
with the client's specific per-thread signal mask.
The structure of this function is such that, if the syscall is
interrupted by a signal, we can determine exactly what
execution state we were in with respect to the execution of
the syscall by examining the value of PC in the signal
handler. This means that we can always do the appropriate
thing to precisely emulate the kernel's signal/syscall
interactions.
The syscall number is taken from the argument, even though it
should also be in regs->v0. The syscall result is written
back to regs->v0 on completion.
VG_(fixup_guest_state_after_syscall_interrupted) does the
thread state fixup in the case where we were interrupted by a
signal.
Prototype:
UWord ML_(do_syscall_for_client_WRK)(
Int syscallno, // $4 - a0
void* guest_state, // $5 - a1
const vki_sigset_t *sysmask, // $6 - a2
const vki_sigset_t *postmask, // $7 - a3
Int nsigwords) // $8 - a4
*/
/* from vki_arch.h */
#define VKI_SIG_SETMASK 3
.globl ML_(do_syscall_for_client_WRK)
ML_(do_syscall_for_client_WRK):
/* save regs $a0 - $a4 on stack */
daddiu $29, $29, -48
sd $4, 0($29) /* syscallno */
sd $5, 8($29) /* guest_state */
sd $6, 16($29) /* sysmask */
sd $7, 24($29) /* postmask */
sd $8, 32($29) /* nsigwords */
1: li $2, __NR_rt_sigprocmask
li $4, VKI_SIG_SETMASK
move $5, $6 /* sysmask */
move $6, $7 /* postmask */
move $7, $8 /* nsigwords */
syscall
bnez $7, 7f
nop
/* Actually do the client syscall */
ld $5, 8($29) /* guest_state */
ld $4, OFFSET_mips64_r4($5) /* a0 */
ld $6, OFFSET_mips64_r6($5) /* a2 */
ld $7, OFFSET_mips64_r7($5) /* a3 */
ld $8, OFFSET_mips64_r8($5) /* a4 */
ld $9, OFFSET_mips64_r9($5) /* a5 */
ld $10, OFFSET_mips64_r10($5) /* a6 */
ld $11, OFFSET_mips64_r11($5) /* a7 */
ld $5, OFFSET_mips64_r5($5) /* a1 */
ld $2, 0($29) /* syscallno */
2: syscall
/* Saving return values into Guest state */
3: ld $5, 8($29) /* guest_state */
sd $2, OFFSET_mips64_r2($5) /* v0 */
sd $7, OFFSET_mips64_r7($5) /* a3 */
4: li $2, __NR_rt_sigprocmask
li $4, VKI_SIG_SETMASK
ld $5, 24($29) /* postmask */
move $6, $0 /* 0 (zero) */
ld $7, 32($29) /* nsigwords */
syscall
bnez $7, 7f
nop
5: /* restore 29 and return */
daddiu $29, $29, 48
jr $31
nop
7: /* error */
daddiu $29, $29, 48
li $2, 0x8000
jr $31
nop
.section .rodata
/* export the ranges so that
VG_(fixup_guest_state_after_syscall_interrupted) can do the
right thing */
.globl ML_(blksys_setup)
.globl ML_(blksys_restart)
.globl ML_(blksys_complete)
.globl ML_(blksys_committed)
.globl ML_(blksys_finished)
#if defined(VGABI_N32)
ML_(blksys_setup): .int 1b
ML_(blksys_restart): .int 2b
ML_(blksys_complete): .int 3b
ML_(blksys_committed): .int 4b
ML_(blksys_finished): .int 5b
#else
ML_(blksys_setup): .quad 1b
ML_(blksys_restart): .quad 2b
ML_(blksys_complete): .quad 3b
ML_(blksys_committed): .quad 4b
ML_(blksys_finished): .quad 5b
#endif
#endif // defined(VGP_mips64_linux)
/* Let the linker know we don't need an executable stack */
MARK_STACK_NO_EXEC
/*--------------------------------------------------------------------*/
/*--- end ---*/
/*--------------------------------------------------------------------*/
|
