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1da177e4 LT |
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 - 2000, 2001 by Ralf Baechle | |
7 | * Copyright (C) 1999, 2000 Silicon Graphics, Inc. | |
8 | * Copyright (C) 2001 MIPS Technologies, Inc. | |
9 | * Copyright (C) 2004 Thiemo Seufer | |
10 | * | |
11 | * Hairy, the userspace application uses a different argument passing | |
12 | * convention than the kernel, so we have to translate things from o32 | |
70342287 | 13 | * to ABI64 calling convention. 64-bit syscalls are also processed |
1da177e4 LT |
14 | * here for now. |
15 | */ | |
1da177e4 LT |
16 | #include <linux/errno.h> |
17 | #include <asm/asm.h> | |
18 | #include <asm/asmmacro.h> | |
192ef366 | 19 | #include <asm/irqflags.h> |
1da177e4 LT |
20 | #include <asm/mipsregs.h> |
21 | #include <asm/regdef.h> | |
22 | #include <asm/stackframe.h> | |
23 | #include <asm/thread_info.h> | |
24 | #include <asm/unistd.h> | |
25 | #include <asm/sysmips.h> | |
26 | ||
70342287 | 27 | .align 5 |
1da177e4 LT |
28 | NESTED(handle_sys, PT_SIZE, sp) |
29 | .set noat | |
30 | SAVE_SOME | |
eae6c0da | 31 | TRACE_IRQS_ON_RELOAD |
1da177e4 LT |
32 | STI |
33 | .set at | |
34 | ld t1, PT_EPC(sp) # skip syscall on return | |
35 | ||
36 | dsubu t0, v0, __NR_O32_Linux # check syscall number | |
be856439 | 37 | sltiu t0, t0, __NR_O32_Linux_syscalls |
1da177e4 LT |
38 | daddiu t1, 4 # skip to next instruction |
39 | sd t1, PT_EPC(sp) | |
40 | beqz t0, not_o32_scall | |
41 | #if 0 | |
42 | SAVE_ALL | |
43 | move a1, v0 | |
da706e50 | 44 | ASM_PRINT("Scall %ld\n") |
1da177e4 LT |
45 | RESTORE_ALL |
46 | #endif | |
47 | ||
48 | /* We don't want to stumble over broken sign extensions from | |
49 | userland. O32 does never use the upper half. */ | |
50 | sll a0, a0, 0 | |
51 | sll a1, a1, 0 | |
52 | sll a2, a2, 0 | |
53 | sll a3, a3, 0 | |
54 | ||
1da177e4 LT |
55 | sd a3, PT_R26(sp) # save a3 for syscall restarting |
56 | ||
57 | /* | |
58 | * More than four arguments. Try to deal with it by copying the | |
59 | * stack arguments from the user stack to the kernel stack. | |
60 | * This Sucks (TM). | |
61 | * | |
62 | * We intentionally keep the kernel stack a little below the top of | |
63 | * userspace so we don't have to do a slower byte accurate check here. | |
64 | */ | |
65 | ld t0, PT_R29(sp) # get old user stack pointer | |
66 | daddu t1, t0, 32 | |
67 | bltz t1, bad_stack | |
68 | ||
7928eb03 RB |
69 | load_a4: lw a4, 16(t0) # argument #5 from usp |
70 | load_a5: lw a5, 20(t0) # argument #6 from usp | |
71 | load_a6: lw a6, 24(t0) # argument #7 from usp | |
72 | load_a7: lw a7, 28(t0) # argument #8 from usp | |
73 | loads_done: | |
1da177e4 LT |
74 | |
75 | .section __ex_table,"a" | |
7928eb03 RB |
76 | PTR load_a4, bad_stack_a4 |
77 | PTR load_a5, bad_stack_a5 | |
78 | PTR load_a6, bad_stack_a6 | |
79 | PTR load_a7, bad_stack_a7 | |
1da177e4 LT |
80 | .previous |
81 | ||
e7f3b48a | 82 | li t1, _TIF_WORK_SYSCALL_ENTRY |
1da177e4 LT |
83 | LONG_L t0, TI_FLAGS($28) # syscall tracing enabled? |
84 | and t0, t1, t0 | |
85 | bnez t0, trace_a_syscall | |
86 | ||
d218af78 | 87 | syscall_common: |
a400bed6 MR |
88 | dsll t0, v0, 3 # offset into table |
89 | ld t2, (sys32_call_table - (__NR_O32_Linux * 8))(t0) | |
90 | ||
1da177e4 LT |
91 | jalr t2 # Do The Real Thing (TM) |
92 | ||
93 | li t0, -EMAXERRNO - 1 # error? | |
94 | sltu t0, t0, v0 | |
95 | sd t0, PT_R7(sp) # set error flag | |
96 | beqz t0, 1f | |
97 | ||
8f5a00eb | 98 | ld t1, PT_R2(sp) # syscall number |
1da177e4 | 99 | dnegu v0 # error |
8f5a00eb | 100 | sd t1, PT_R0(sp) # save it for syscall restarting |
1da177e4 LT |
101 | 1: sd v0, PT_R2(sp) # result |
102 | ||
103 | o32_syscall_exit: | |
02f884ed | 104 | j syscall_exit_partial |
1da177e4 LT |
105 | |
106 | /* ------------------------------------------------------------------------ */ | |
107 | ||
108 | trace_a_syscall: | |
109 | SAVE_STATIC | |
110 | sd a4, PT_R8(sp) # Save argument registers | |
111 | sd a5, PT_R9(sp) | |
112 | sd a6, PT_R10(sp) | |
113 | sd a7, PT_R11(sp) # For indirect syscalls | |
114 | ||
1da177e4 | 115 | move a0, sp |
4c21b8fd | 116 | /* |
ad61ba23 | 117 | * absolute syscall number is in v0 unless we called syscall(__NR_###) |
4c21b8fd MC |
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 | */ | |
ad61ba23 MC |
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 */ | |
79b4a9cf | 128 | ld a1, PT_R4(sp) /* Arg1 for __NR_syscall case */ |
ad61ba23 | 129 | .set pop |
4c21b8fd MC |
130 | |
131 | 1: jal syscall_trace_enter | |
1da177e4 | 132 | |
d218af78 | 133 | bltz v0, 1f # seccomp failed? Skip syscall |
9d37c405 | 134 | |
04a7052c | 135 | RESTORE_STATIC |
a400bed6 | 136 | ld v0, PT_R2(sp) # Restore syscall (maybe modified) |
1da177e4 LT |
137 | ld a0, PT_R4(sp) # Restore argument registers |
138 | ld a1, PT_R5(sp) | |
139 | ld a2, PT_R6(sp) | |
140 | ld a3, PT_R7(sp) | |
141 | ld a4, PT_R8(sp) | |
142 | ld a5, PT_R9(sp) | |
143 | ld a6, PT_R10(sp) | |
144 | ld a7, PT_R11(sp) # For indirect syscalls | |
a400bed6 MR |
145 | |
146 | dsubu t0, v0, __NR_O32_Linux # check (new) syscall number | |
be856439 | 147 | sltiu t0, t0, __NR_O32_Linux_syscalls |
a400bed6 MR |
148 | beqz t0, not_o32_scall |
149 | ||
d218af78 | 150 | j syscall_common |
1da177e4 | 151 | |
d218af78 | 152 | 1: j syscall_exit |
1da177e4 LT |
153 | |
154 | /* ------------------------------------------------------------------------ */ | |
155 | ||
156 | /* | |
157 | * The stackpointer for a call with more than 4 arguments is bad. | |
158 | */ | |
159 | bad_stack: | |
5b89c004 | 160 | li v0, EFAULT |
1da177e4 LT |
161 | sd v0, PT_R2(sp) |
162 | li t0, 1 # set error flag | |
163 | sd t0, PT_R7(sp) | |
164 | j o32_syscall_exit | |
165 | ||
7928eb03 RB |
166 | bad_stack_a4: |
167 | li a4, 0 | |
168 | b load_a5 | |
169 | ||
170 | bad_stack_a5: | |
171 | li a5, 0 | |
172 | b load_a6 | |
173 | ||
174 | bad_stack_a6: | |
175 | li a6, 0 | |
176 | b load_a7 | |
177 | ||
178 | bad_stack_a7: | |
179 | li a7, 0 | |
180 | b loads_done | |
181 | ||
1da177e4 LT |
182 | not_o32_scall: |
183 | /* | |
184 | * This is not an o32 compatibility syscall, pass it on | |
185 | * to the 64-bit syscall handlers. | |
186 | */ | |
187 | #ifdef CONFIG_MIPS32_N32 | |
188 | j handle_sysn32 | |
189 | #else | |
190 | j handle_sys64 | |
191 | #endif | |
192 | END(handle_sys) | |
193 | ||
194 | LEAF(sys32_syscall) | |
e807f957 | 195 | subu t0, a0, __NR_O32_Linux # check syscall number |
be856439 | 196 | sltiu v0, t0, __NR_O32_Linux_syscalls |
e807f957 VM |
197 | beqz t0, einval # do not recurse |
198 | dsll t1, t0, 3 | |
1da177e4 | 199 | beqz v0, einval |
2a9c2751 | 200 | ld t2, sys32_call_table(t1) # syscall routine |
1da177e4 LT |
201 | |
202 | move a0, a1 # shift argument registers | |
203 | move a1, a2 | |
204 | move a2, a3 | |
205 | move a3, a4 | |
206 | move a4, a5 | |
207 | move a5, a6 | |
208 | move a6, a7 | |
1da177e4 LT |
209 | jr t2 |
210 | /* Unreached */ | |
211 | ||
70342287 | 212 | einval: li v0, -ENOSYS |
1da177e4 LT |
213 | jr ra |
214 | END(sys32_syscall) | |
215 | ||
dc7077f8 | 216 | #define __SYSCALL(nr, entry) PTR entry |
1da177e4 | 217 | .align 3 |
2a9c2751 RB |
218 | .type sys32_call_table,@object |
219 | EXPORT(sys32_call_table) | |
99bf73eb FK |
220 | #include <asm/syscall_table_64_o32.h> |
221 | #undef __SYSCALL |