1 /* 1 /*
2 * This file is subject to the terms and condi 2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the mai 3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details. 4 * for more details.
5 * 5 *
6 * Copyright (C) 1995 - 2000, 2001 by Ralf Bae 6 * Copyright (C) 1995 - 2000, 2001 by Ralf Baechle
7 * Copyright (C) 1999, 2000 Silicon Graphics, 7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
8 * Copyright (C) 2001 MIPS Technologies, Inc. 8 * Copyright (C) 2001 MIPS Technologies, Inc.
9 * Copyright (C) 2004 Thiemo Seufer 9 * Copyright (C) 2004 Thiemo Seufer
10 * 10 *
11 * Hairy, the userspace application uses a dif 11 * Hairy, the userspace application uses a different argument passing
12 * convention than the kernel, so we have to t 12 * convention than the kernel, so we have to translate things from o32
13 * to ABI64 calling convention. 64-bit syscal 13 * to ABI64 calling convention. 64-bit syscalls are also processed
14 * here for now. 14 * here for now.
15 */ 15 */
16 #include <linux/errno.h> 16 #include <linux/errno.h>
17 #include <asm/asm.h> 17 #include <asm/asm.h>
18 #include <asm/asmmacro.h> 18 #include <asm/asmmacro.h>
19 #include <asm/irqflags.h> 19 #include <asm/irqflags.h>
20 #include <asm/mipsregs.h> 20 #include <asm/mipsregs.h>
21 #include <asm/regdef.h> 21 #include <asm/regdef.h>
22 #include <asm/stackframe.h> 22 #include <asm/stackframe.h>
23 #include <asm/thread_info.h> 23 #include <asm/thread_info.h>
24 #include <asm/unistd.h> 24 #include <asm/unistd.h>
25 #include <asm/sysmips.h> 25 #include <asm/sysmips.h>
26 26
27 .align 5 27 .align 5
28 NESTED(handle_sys, PT_SIZE, sp) 28 NESTED(handle_sys, PT_SIZE, sp)
29 .set noat 29 .set noat
30 SAVE_SOME 30 SAVE_SOME
31 TRACE_IRQS_ON_RELOAD 31 TRACE_IRQS_ON_RELOAD
32 STI 32 STI
33 .set at 33 .set at
34 ld t1, PT_EPC(sp) # skip 34 ld t1, PT_EPC(sp) # skip syscall on return
35 35
36 dsubu t0, v0, __NR_O32_Linux # chec 36 dsubu t0, v0, __NR_O32_Linux # check syscall number
37 sltiu t0, t0, __NR_O32_Linux_syscall 37 sltiu t0, t0, __NR_O32_Linux_syscalls
38 daddiu t1, 4 # skip 38 daddiu t1, 4 # skip to next instruction
39 sd t1, PT_EPC(sp) 39 sd t1, PT_EPC(sp)
40 beqz t0, not_o32_scall 40 beqz t0, not_o32_scall
41 #if 0 41 #if 0
42 SAVE_ALL 42 SAVE_ALL
43 move a1, v0 43 move a1, v0
44 ASM_PRINT("Scall %ld\n") 44 ASM_PRINT("Scall %ld\n")
45 RESTORE_ALL 45 RESTORE_ALL
46 #endif 46 #endif
47 47
48 /* We don't want to stumble over broke 48 /* We don't want to stumble over broken sign extensions from
49 userland. O32 does never use the up 49 userland. O32 does never use the upper half. */
50 sll a0, a0, 0 50 sll a0, a0, 0
51 sll a1, a1, 0 51 sll a1, a1, 0
52 sll a2, a2, 0 52 sll a2, a2, 0
53 sll a3, a3, 0 53 sll a3, a3, 0
54 54
55 sd a3, PT_R26(sp) # save 55 sd a3, PT_R26(sp) # save a3 for syscall restarting
56 56
57 /* 57 /*
58 * More than four arguments. Try to d 58 * More than four arguments. Try to deal with it by copying the
59 * stack arguments from the user stack 59 * stack arguments from the user stack to the kernel stack.
60 * This Sucks (TM). 60 * This Sucks (TM).
61 * 61 *
62 * We intentionally keep the kernel st 62 * We intentionally keep the kernel stack a little below the top of
63 * userspace so we don't have to do a 63 * userspace so we don't have to do a slower byte accurate check here.
64 */ 64 */
65 ld t0, PT_R29(sp) # get 65 ld t0, PT_R29(sp) # get old user stack pointer
66 daddu t1, t0, 32 66 daddu t1, t0, 32
67 bltz t1, bad_stack 67 bltz t1, bad_stack
68 68
69 load_a4: lw a4, 16(t0) # argu 69 load_a4: lw a4, 16(t0) # argument #5 from usp
70 load_a5: lw a5, 20(t0) # argu 70 load_a5: lw a5, 20(t0) # argument #6 from usp
71 load_a6: lw a6, 24(t0) # argu 71 load_a6: lw a6, 24(t0) # argument #7 from usp
72 load_a7: lw a7, 28(t0) # argu 72 load_a7: lw a7, 28(t0) # argument #8 from usp
73 loads_done: 73 loads_done:
74 74
75 .section __ex_table,"a" 75 .section __ex_table,"a"
76 PTR_WD load_a4, bad_stack_a4 !! 76 PTR load_a4, bad_stack_a4
77 PTR_WD load_a5, bad_stack_a5 !! 77 PTR load_a5, bad_stack_a5
78 PTR_WD load_a6, bad_stack_a6 !! 78 PTR load_a6, bad_stack_a6
79 PTR_WD load_a7, bad_stack_a7 !! 79 PTR load_a7, bad_stack_a7
80 .previous 80 .previous
81 81
82 /* <<
83 * absolute syscall number is in v0 un <<
84 * where the real syscall number is in <<
85 * note: NR_syscall is the first O32 s <<
86 * only defined when compiling with -m <<
87 * therefore __NR_O32_Linux is used (4 <<
88 */ <<
89 <<
90 subu t2, v0, __NR_O32_Linux <<
91 bnez t2, 1f /* __NR_syscall at offs <<
92 LONG_S a0, TI_SYSCALL($28) # Save <<
93 b 2f <<
94 1: <<
95 LONG_S v0, TI_SYSCALL($28) # Save <<
96 2: <<
97 <<
98 li t1, _TIF_WORK_SYSCALL_ENTRY 82 li t1, _TIF_WORK_SYSCALL_ENTRY
99 LONG_L t0, TI_FLAGS($28) # sysc 83 LONG_L t0, TI_FLAGS($28) # syscall tracing enabled?
100 and t0, t1, t0 84 and t0, t1, t0
101 bnez t0, trace_a_syscall 85 bnez t0, trace_a_syscall
102 86
103 syscall_common: 87 syscall_common:
104 dsll t0, v0, 3 # offs 88 dsll t0, v0, 3 # offset into table
105 ld t2, (sys32_call_table - (__NR_ 89 ld t2, (sys32_call_table - (__NR_O32_Linux * 8))(t0)
106 90
107 jalr t2 # Do T 91 jalr t2 # Do The Real Thing (TM)
108 92
109 li t0, -EMAXERRNO - 1 # erro 93 li t0, -EMAXERRNO - 1 # error?
110 sltu t0, t0, v0 94 sltu t0, t0, v0
111 sd t0, PT_R7(sp) # set 95 sd t0, PT_R7(sp) # set error flag
112 beqz t0, 1f 96 beqz t0, 1f
113 97
114 ld t1, PT_R2(sp) # sysc 98 ld t1, PT_R2(sp) # syscall number
115 dnegu v0 # erro 99 dnegu v0 # error
116 sd t1, PT_R0(sp) # save 100 sd t1, PT_R0(sp) # save it for syscall restarting
117 1: sd v0, PT_R2(sp) # resu 101 1: sd v0, PT_R2(sp) # result
118 102
119 o32_syscall_exit: 103 o32_syscall_exit:
120 j syscall_exit_partial 104 j syscall_exit_partial
121 105
122 /* ------------------------------------------- 106 /* ------------------------------------------------------------------------ */
123 107
124 trace_a_syscall: 108 trace_a_syscall:
125 SAVE_STATIC 109 SAVE_STATIC
126 sd a4, PT_R8(sp) # Save 110 sd a4, PT_R8(sp) # Save argument registers
127 sd a5, PT_R9(sp) 111 sd a5, PT_R9(sp)
128 sd a6, PT_R10(sp) 112 sd a6, PT_R10(sp)
129 sd a7, PT_R11(sp) # For 113 sd a7, PT_R11(sp) # For indirect syscalls
130 114
131 move a0, sp 115 move a0, sp
132 jal syscall_trace_enter !! 116 /*
>> 117 * absolute syscall number is in v0 unless we called syscall(__NR_###)
>> 118 * where the real syscall number is in a0
>> 119 * note: NR_syscall is the first O32 syscall but the macro is
>> 120 * only defined when compiling with -mabi=32 (CONFIG_32BIT)
>> 121 * therefore __NR_O32_Linux is used (4000)
>> 122 */
>> 123 .set push
>> 124 .set reorder
>> 125 subu t1, v0, __NR_O32_Linux
>> 126 move a1, v0
>> 127 bnez t1, 1f /* __NR_syscall at offset 0 */
>> 128 ld a1, PT_R4(sp) /* Arg1 for __NR_syscall case */
>> 129 .set pop
>> 130
>> 131 1: jal syscall_trace_enter
133 132
134 bltz v0, 1f # secc 133 bltz v0, 1f # seccomp failed? Skip syscall
135 134
136 RESTORE_STATIC 135 RESTORE_STATIC
137 ld v0, PT_R2(sp) # Rest 136 ld v0, PT_R2(sp) # Restore syscall (maybe modified)
138 ld a0, PT_R4(sp) # Rest 137 ld a0, PT_R4(sp) # Restore argument registers
139 ld a1, PT_R5(sp) 138 ld a1, PT_R5(sp)
140 ld a2, PT_R6(sp) 139 ld a2, PT_R6(sp)
141 ld a3, PT_R7(sp) 140 ld a3, PT_R7(sp)
142 ld a4, PT_R8(sp) 141 ld a4, PT_R8(sp)
143 ld a5, PT_R9(sp) 142 ld a5, PT_R9(sp)
144 ld a6, PT_R10(sp) 143 ld a6, PT_R10(sp)
145 ld a7, PT_R11(sp) # For 144 ld a7, PT_R11(sp) # For indirect syscalls
146 145
147 dsubu t0, v0, __NR_O32_Linux # chec 146 dsubu t0, v0, __NR_O32_Linux # check (new) syscall number
148 sltiu t0, t0, __NR_O32_Linux_syscall 147 sltiu t0, t0, __NR_O32_Linux_syscalls
149 beqz t0, not_o32_scall 148 beqz t0, not_o32_scall
150 149
151 j syscall_common 150 j syscall_common
152 151
153 1: j syscall_exit 152 1: j syscall_exit
154 153
155 /* ------------------------------------------- 154 /* ------------------------------------------------------------------------ */
156 155
157 /* 156 /*
158 * The stackpointer for a call with mo 157 * The stackpointer for a call with more than 4 arguments is bad.
159 */ 158 */
160 bad_stack: 159 bad_stack:
161 li v0, EFAULT 160 li v0, EFAULT
162 sd v0, PT_R2(sp) 161 sd v0, PT_R2(sp)
163 li t0, 1 # set 162 li t0, 1 # set error flag
164 sd t0, PT_R7(sp) 163 sd t0, PT_R7(sp)
165 j o32_syscall_exit 164 j o32_syscall_exit
166 165
167 bad_stack_a4: 166 bad_stack_a4:
168 li a4, 0 167 li a4, 0
169 b load_a5 168 b load_a5
170 169
171 bad_stack_a5: 170 bad_stack_a5:
172 li a5, 0 171 li a5, 0
173 b load_a6 172 b load_a6
174 173
175 bad_stack_a6: 174 bad_stack_a6:
176 li a6, 0 175 li a6, 0
177 b load_a7 176 b load_a7
178 177
179 bad_stack_a7: 178 bad_stack_a7:
180 li a7, 0 179 li a7, 0
181 b loads_done 180 b loads_done
182 181
183 not_o32_scall: 182 not_o32_scall:
184 /* 183 /*
185 * This is not an o32 compatibility sy 184 * This is not an o32 compatibility syscall, pass it on
186 * to the 64-bit syscall handlers. 185 * to the 64-bit syscall handlers.
187 */ 186 */
188 #ifdef CONFIG_MIPS32_N32 187 #ifdef CONFIG_MIPS32_N32
189 j handle_sysn32 188 j handle_sysn32
190 #else 189 #else
191 j handle_sys64 190 j handle_sys64
192 #endif 191 #endif
193 END(handle_sys) 192 END(handle_sys)
194 193
195 LEAF(sys32_syscall) 194 LEAF(sys32_syscall)
196 subu t0, a0, __NR_O32_Linux # chec 195 subu t0, a0, __NR_O32_Linux # check syscall number
197 sltiu v0, t0, __NR_O32_Linux_syscall 196 sltiu v0, t0, __NR_O32_Linux_syscalls
198 beqz t0, einval # do n 197 beqz t0, einval # do not recurse
199 dsll t1, t0, 3 198 dsll t1, t0, 3
200 beqz v0, einval 199 beqz v0, einval
201 ld t2, sys32_call_table(t1) 200 ld t2, sys32_call_table(t1) # syscall routine
202 201
203 move a0, a1 # shif 202 move a0, a1 # shift argument registers
204 move a1, a2 203 move a1, a2
205 move a2, a3 204 move a2, a3
206 move a3, a4 205 move a3, a4
207 move a4, a5 206 move a4, a5
208 move a5, a6 207 move a5, a6
209 move a6, a7 208 move a6, a7
210 jr t2 209 jr t2
211 /* Unreached */ 210 /* Unreached */
212 211
213 einval: li v0, -ENOSYS 212 einval: li v0, -ENOSYS
214 jr ra 213 jr ra
215 END(sys32_syscall) 214 END(sys32_syscall)
216 215
217 #define __SYSCALL_WITH_COMPAT(nr, native, comp 216 #define __SYSCALL_WITH_COMPAT(nr, native, compat) __SYSCALL(nr, compat)
218 #define __SYSCALL(nr, entry) PTR_WD entry !! 217 #define __SYSCALL(nr, entry) PTR entry
219 .align 3 218 .align 3
220 .type sys32_call_table,@object 219 .type sys32_call_table,@object
221 EXPORT(sys32_call_table) 220 EXPORT(sys32_call_table)
222 #include <asm/syscall_table_o32.h> 221 #include <asm/syscall_table_o32.h>
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