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, 96, 97, 98, 99, 2000, 01, 02 by Ralf Baechle |
7 | * Copyright (C) 1999, 2000 Silicon Graphics, Inc. |
8 | * Copyright (C) 2001 MIPS Technologies, Inc. |
9 | */ |
10 | #include <linux/errno.h> |
11 | #include <asm/asm.h> |
12 | #include <asm/asmmacro.h> |
13 | #include <asm/irqflags.h> |
14 | #include <asm/mipsregs.h> |
15 | #include <asm/regdef.h> |
16 | #include <asm/stackframe.h> |
17 | #include <asm/asm-offsets.h> |
18 | #include <asm/sysmips.h> |
19 | #include <asm/thread_info.h> |
20 | #include <asm/unistd.h> |
21 | |
22 | #ifndef CONFIG_MIPS32_COMPAT |
23 | /* Neither O32 nor N32, so define handle_sys here */ |
24 | #define handle_sys64 handle_sys |
25 | #endif |
26 | |
27 | .align 5 |
28 | NESTED(handle_sys64, PT_SIZE, sp) |
29 | #if !defined(CONFIG_MIPS32_O32) && !defined(CONFIG_MIPS32_N32) |
30 | /* |
31 | * When 32-bit compatibility is configured scall_o32.S |
32 | * already did this. |
33 | */ |
34 | .set noat |
35 | SAVE_SOME |
36 | TRACE_IRQS_ON_RELOAD |
37 | STI |
38 | .set at |
39 | #endif |
40 | |
41 | #if !defined(CONFIG_MIPS32_O32) && !defined(CONFIG_MIPS32_N32) |
42 | ld t1, PT_EPC(sp) # skip syscall on return |
43 | daddiu t1, 4 # skip to next instruction |
44 | sd t1, PT_EPC(sp) |
45 | #endif |
46 | |
47 | sd a3, PT_R26(sp) # save a3 for syscall restarting |
48 | |
49 | li t1, _TIF_WORK_SYSCALL_ENTRY |
50 | LONG_L t0, TI_FLAGS($28) # syscall tracing enabled? |
51 | and t0, t1, t0 |
52 | bnez t0, syscall_trace_entry |
53 | |
54 | syscall_common: |
55 | dsubu t2, v0, __NR_64_Linux |
56 | sltiu t0, t2, __NR_64_Linux_syscalls |
57 | beqz t0, illegal_syscall |
58 | |
59 | dsll t0, t2, 3 # offset into table |
60 | dla t2, sys_call_table |
61 | daddu t0, t2, t0 |
62 | ld t2, (t0) # syscall routine |
63 | beqz t2, illegal_syscall |
64 | |
65 | jalr t2 # Do The Real Thing (TM) |
66 | |
67 | li t0, -EMAXERRNO - 1 # error? |
68 | sltu t0, t0, v0 |
69 | sd t0, PT_R7(sp) # set error flag |
70 | beqz t0, 1f |
71 | |
72 | ld t1, PT_R2(sp) # syscall number |
73 | dnegu v0 # error |
74 | sd t1, PT_R0(sp) # save it for syscall restarting |
75 | 1: sd v0, PT_R2(sp) # result |
76 | |
77 | n64_syscall_exit: |
78 | j syscall_exit_partial |
79 | |
80 | /* ------------------------------------------------------------------------ */ |
81 | |
82 | syscall_trace_entry: |
83 | SAVE_STATIC |
84 | move a0, sp |
85 | move a1, v0 |
86 | jal syscall_trace_enter |
87 | |
88 | bltz v0, 1f # seccomp failed? Skip syscall |
89 | |
90 | RESTORE_STATIC |
91 | ld v0, PT_R2(sp) # Restore syscall (maybe modified) |
92 | ld a0, PT_R4(sp) # Restore argument registers |
93 | ld a1, PT_R5(sp) |
94 | ld a2, PT_R6(sp) |
95 | ld a3, PT_R7(sp) |
96 | ld a4, PT_R8(sp) |
97 | ld a5, PT_R9(sp) |
98 | j syscall_common |
99 | |
100 | 1: j syscall_exit |
101 | |
102 | illegal_syscall: |
103 | /* This also isn't a 64-bit syscall, throw an error. */ |
104 | li v0, ENOSYS # error |
105 | sd v0, PT_R2(sp) |
106 | li t0, 1 # set error flag |
107 | sd t0, PT_R7(sp) |
108 | j n64_syscall_exit |
109 | END(handle_sys64) |
110 | |
111 | #define __SYSCALL(nr, entry) PTR_WD entry |
112 | .align 3 |
113 | .type sys_call_table, @object |
114 | EXPORT(sys_call_table) |
115 | #include <asm/syscall_table_n64.h> |
116 | |