1 /*
2 * This file is subject to the terms and condi
3 * License. See the file "COPYING" in the mai
4 * for more details.
5 *
6 * Copyright (C) 1995-99, 2000- 02, 06 Ralf Ba<
7 * Copyright (C) 2001 MIPS Technologies, Inc.
8 * Copyright (C) 2004 Thiemo Seufer
9 * Copyright (C) 2014 Imagination Technologies
10 */
11 #include <linux/errno.h>
12 #include <asm/asm.h>
13 #include <asm/asmmacro.h>
14 #include <asm/irqflags.h>
15 #include <asm/mipsregs.h>
16 #include <asm/regdef.h>
17 #include <asm/stackframe.h>
18 #include <asm/isadep.h>
19 #include <asm/sysmips.h>
20 #include <asm/thread_info.h>
21 #include <asm/unistd.h>
22 #include <asm/asm-offsets.h>
23
24 .align 5
25 NESTED(handle_sys, PT_SIZE, sp)
26 .set noat
27 SAVE_SOME
28 TRACE_IRQS_ON_RELOAD
29 STI
30 .set at
31
32 lw t1, PT_EPC(sp) # skip
33
34 addiu t1, 4 # skip
35 sw t1, PT_EPC(sp)
36
37 sw a3, PT_R26(sp) # save
38
39 /*
40 * More than four arguments. Try to d
41 * stack arguments from the user stack
42 * This Sucks (TM).
43 */
44 lw t0, PT_R29(sp) # get
45
46 /*
47 * We intentionally keep the kernel st
48 * userspace so we don't have to do a
49 */
50 addu t4, t0, 32
51 bltz t4, bad_stack # -> s
52
53 /*
54 * Ok, copy the args from the luser st
55 */
56
57 .set push
58 .set noreorder
59 .set nomacro
60
61 load_a4: user_lw(t5, 16(t0)) # argu
62 load_a5: user_lw(t6, 20(t0)) # argu
63 load_a6: user_lw(t7, 24(t0)) # argu
64 load_a7: user_lw(t8, 28(t0)) # argu
65 loads_done:
66
67 sw t5, 16(sp) # argu
68 sw t6, 20(sp) # argu
69 sw t7, 24(sp) # argu
70 sw t8, 28(sp) # argu
71 .set pop
72
73 .section __ex_table,"a"
74 PTR_WD load_a4, bad_stack_a4
75 PTR_WD load_a5, bad_stack_a5
76 PTR_WD load_a6, bad_stack_a6
77 PTR_WD load_a7, bad_stack_a7
78 .previous
79
80 /*
81 * syscall number is in v0 unless we c
82 * where the real syscall number is in
83 */
84 subu t2, v0, __NR_O32_Linux
85 bnez t2, 1f /* __NR_syscall at offs
86 LONG_S a0, TI_SYSCALL($28) # Save
87 b 2f
88 1:
89 LONG_S v0, TI_SYSCALL($28) # Save
90 2:
91
92 lw t0, TI_FLAGS($28) # sysc
93 li t1, _TIF_WORK_SYSCALL_ENTRY
94 and t0, t1
95 bnez t0, syscall_trace_entry # -> y
96 syscall_common:
97 subu v0, v0, __NR_O32_Linux # chec
98 sltiu t0, v0, __NR_O32_Linux_syscall
99 beqz t0, illegal_syscall
100
101 sll t0, v0, 2
102 la t1, sys_call_table
103 addu t1, t0
104 lw t2, (t1) # sysc
105
106 beqz t2, illegal_syscall
107
108 jalr t2 # Do T
109
110 li t0, -EMAXERRNO - 1 # erro
111 sltu t0, t0, v0
112 sw t0, PT_R7(sp) # set
113 beqz t0, 1f
114
115 lw t1, PT_R2(sp) # sysc
116 negu v0 # erro
117 sw t1, PT_R0(sp) # save
118 1: sw v0, PT_R2(sp) # resu
119
120 o32_syscall_exit:
121 j syscall_exit_partial
122
123 /* -------------------------------------------
124
125 syscall_trace_entry:
126 SAVE_STATIC
127 move a0, sp
128
129 jal syscall_trace_enter
130
131 bltz v0, 1f # secc
132
133 RESTORE_STATIC
134 lw v0, PT_R2(sp) # Rest
135 lw a0, PT_R4(sp) # Rest
136 lw a1, PT_R5(sp)
137 lw a2, PT_R6(sp)
138 lw a3, PT_R7(sp)
139 j syscall_common
140
141 1: j syscall_exit
142
143 /* -------------------------------------------
144
145 /*
146 * Our open-coded access area sanity t
147 * failed. We probably should handle t
148 */
149 bad_stack:
150 li v0, EFAULT
151 sw v0, PT_R2(sp)
152 li t0, 1
153 sw t0, PT_R7(sp)
154 j o32_syscall_exit
155
156 bad_stack_a4:
157 li t5, 0
158 b load_a5
159
160 bad_stack_a5:
161 li t6, 0
162 b load_a6
163
164 bad_stack_a6:
165 li t7, 0
166 b load_a7
167
168 bad_stack_a7:
169 li t8, 0
170 b loads_done
171
172 /*
173 * The system call does not exist in t
174 */
175 illegal_syscall:
176 li v0, ENOSYS
177 sw v0, PT_R2(sp)
178 li t0, 1
179 sw t0, PT_R7(sp)
180 j o32_syscall_exit
181 END(handle_sys)
182
183 LEAF(sys_syscall)
184 subu t0, a0, __NR_O32_Linux # chec
185 sltiu v0, t0, __NR_O32_Linux_syscall
186 beqz t0, einval # do n
187 sll t1, t0, 2
188 beqz v0, einval
189 lw t2, sys_call_table(t1)
190
191 move a0, a1
192 move a1, a2
193 move a2, a3
194 lw a3, 16(sp)
195 lw t4, 20(sp)
196 lw t5, 24(sp)
197 lw t6, 28(sp)
198 sw t4, 16(sp)
199 sw t5, 20(sp)
200 sw t6, 24(sp)
201 jr t2
202 /* Unreached */
203
204 einval: li v0, -ENOSYS
205 jr ra
206 END(sys_syscall)
207
208 #ifdef CONFIG_MIPS_MT_FPAFF
209 /*
210 * For FPU affinity scheduling on MIPS
211 * intercept sys_sched_xxxaffinity() c
212 * in kernel/sched/core.c. Considered
213 * these hooks for the 32-bit kernel -
214 * atm.
215 */
216 #define sys_sched_setaffinity mipsmt_sys_sch
217 #define sys_sched_getaffinity mipsmt_sys_sch
218 #endif /* CONFIG_MIPS_MT_FPAFF */
219
220 #define __SYSCALL_WITH_COMPAT(nr, native, comp
221 #define __SYSCALL(nr, entry) PTR_WD entry
222 .align 2
223 .type sys_call_table, @object
224 EXPORT(sys_call_table)
225 #include <asm/syscall_table_o32.h>
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