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, 96, 97, 98, 99, 2000, 0 6 * Copyright (C) 1995, 96, 97, 98, 99, 2000, 01, 02 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 */ 9 */
10 #include <linux/errno.h> 10 #include <linux/errno.h>
11 #include <asm/asm.h> 11 #include <asm/asm.h>
12 #include <asm/asmmacro.h> 12 #include <asm/asmmacro.h>
13 #include <asm/irqflags.h> 13 #include <asm/irqflags.h>
14 #include <asm/mipsregs.h> 14 #include <asm/mipsregs.h>
15 #include <asm/regdef.h> 15 #include <asm/regdef.h>
16 #include <asm/stackframe.h> 16 #include <asm/stackframe.h>
17 #include <asm/asm-offsets.h> 17 #include <asm/asm-offsets.h>
18 #include <asm/sysmips.h> 18 #include <asm/sysmips.h>
19 #include <asm/thread_info.h> 19 #include <asm/thread_info.h>
20 #include <asm/unistd.h> 20 #include <asm/unistd.h>
21 21
22 #ifndef CONFIG_MIPS32_COMPAT 22 #ifndef CONFIG_MIPS32_COMPAT
23 /* Neither O32 nor N32, so define handle_sys h 23 /* Neither O32 nor N32, so define handle_sys here */
24 #define handle_sys64 handle_sys 24 #define handle_sys64 handle_sys
25 #endif 25 #endif
26 26
27 .align 5 27 .align 5
28 NESTED(handle_sys64, PT_SIZE, sp) 28 NESTED(handle_sys64, PT_SIZE, sp)
29 #if !defined(CONFIG_MIPS32_O32) && !defined(CO 29 #if !defined(CONFIG_MIPS32_O32) && !defined(CONFIG_MIPS32_N32)
30 /* 30 /*
31 * When 32-bit compatibility is config 31 * When 32-bit compatibility is configured scall_o32.S
32 * already did this. 32 * already did this.
33 */ 33 */
34 .set noat 34 .set noat
35 SAVE_SOME 35 SAVE_SOME
36 TRACE_IRQS_ON_RELOAD 36 TRACE_IRQS_ON_RELOAD
37 STI 37 STI
38 .set at 38 .set at
39 #endif 39 #endif
40 40
41 #if !defined(CONFIG_MIPS32_O32) && !defined(CO 41 #if !defined(CONFIG_MIPS32_O32) && !defined(CONFIG_MIPS32_N32)
42 ld t1, PT_EPC(sp) # skip 42 ld t1, PT_EPC(sp) # skip syscall on return
43 daddiu t1, 4 # skip 43 daddiu t1, 4 # skip to next instruction
44 sd t1, PT_EPC(sp) 44 sd t1, PT_EPC(sp)
45 #endif 45 #endif
46 46
47 sd a3, PT_R26(sp) # save 47 sd a3, PT_R26(sp) # save a3 for syscall restarting
48 48
49 LONG_S v0, TI_SYSCALL($28) # Stor <<
50 <<
51 li t1, _TIF_WORK_SYSCALL_ENTRY 49 li t1, _TIF_WORK_SYSCALL_ENTRY
52 LONG_L t0, TI_FLAGS($28) # sysc 50 LONG_L t0, TI_FLAGS($28) # syscall tracing enabled?
53 and t0, t1, t0 51 and t0, t1, t0
54 bnez t0, syscall_trace_entry 52 bnez t0, syscall_trace_entry
55 53
56 syscall_common: 54 syscall_common:
57 dsubu t2, v0, __NR_64_Linux 55 dsubu t2, v0, __NR_64_Linux
58 sltiu t0, t2, __NR_64_Linux_syscalls 56 sltiu t0, t2, __NR_64_Linux_syscalls
59 beqz t0, illegal_syscall 57 beqz t0, illegal_syscall
60 58
61 dsll t0, t2, 3 # offs 59 dsll t0, t2, 3 # offset into table
62 dla t2, sys_call_table 60 dla t2, sys_call_table
63 daddu t0, t2, t0 61 daddu t0, t2, t0
64 ld t2, (t0) # sysc 62 ld t2, (t0) # syscall routine
65 beqz t2, illegal_syscall 63 beqz t2, illegal_syscall
66 64
67 jalr t2 # Do T 65 jalr t2 # Do The Real Thing (TM)
68 66
69 li t0, -EMAXERRNO - 1 # erro 67 li t0, -EMAXERRNO - 1 # error?
70 sltu t0, t0, v0 68 sltu t0, t0, v0
71 sd t0, PT_R7(sp) # set 69 sd t0, PT_R7(sp) # set error flag
72 beqz t0, 1f 70 beqz t0, 1f
73 71
74 ld t1, PT_R2(sp) # sysc 72 ld t1, PT_R2(sp) # syscall number
75 dnegu v0 # erro 73 dnegu v0 # error
76 sd t1, PT_R0(sp) # save 74 sd t1, PT_R0(sp) # save it for syscall restarting
77 1: sd v0, PT_R2(sp) # resu 75 1: sd v0, PT_R2(sp) # result
78 76
79 n64_syscall_exit: 77 n64_syscall_exit:
80 j syscall_exit_partial 78 j syscall_exit_partial
81 79
82 /* ------------------------------------------- 80 /* ------------------------------------------------------------------------ */
83 81
84 syscall_trace_entry: 82 syscall_trace_entry:
85 SAVE_STATIC 83 SAVE_STATIC
86 move a0, sp 84 move a0, sp
>> 85 move a1, v0
87 jal syscall_trace_enter 86 jal syscall_trace_enter
88 87
89 bltz v0, 1f # secc 88 bltz v0, 1f # seccomp failed? Skip syscall
90 89
91 RESTORE_STATIC 90 RESTORE_STATIC
92 ld v0, PT_R2(sp) # Rest 91 ld v0, PT_R2(sp) # Restore syscall (maybe modified)
93 ld a0, PT_R4(sp) # Rest 92 ld a0, PT_R4(sp) # Restore argument registers
94 ld a1, PT_R5(sp) 93 ld a1, PT_R5(sp)
95 ld a2, PT_R6(sp) 94 ld a2, PT_R6(sp)
96 ld a3, PT_R7(sp) 95 ld a3, PT_R7(sp)
97 ld a4, PT_R8(sp) 96 ld a4, PT_R8(sp)
98 ld a5, PT_R9(sp) 97 ld a5, PT_R9(sp)
99 j syscall_common 98 j syscall_common
100 99
101 1: j syscall_exit 100 1: j syscall_exit
102 101
103 illegal_syscall: 102 illegal_syscall:
104 /* This also isn't a 64-bit syscall, t 103 /* This also isn't a 64-bit syscall, throw an error. */
105 li v0, ENOSYS 104 li v0, ENOSYS # error
106 sd v0, PT_R2(sp) 105 sd v0, PT_R2(sp)
107 li t0, 1 106 li t0, 1 # set error flag
108 sd t0, PT_R7(sp) 107 sd t0, PT_R7(sp)
109 j n64_syscall_exit 108 j n64_syscall_exit
110 END(handle_sys64) 109 END(handle_sys64)
111 110
112 #define __SYSCALL(nr, entry) PTR_WD entry 111 #define __SYSCALL(nr, entry) PTR_WD entry
113 .align 3 112 .align 3
114 .type sys_call_table, @object 113 .type sys_call_table, @object
115 EXPORT(sys_call_table) 114 EXPORT(sys_call_table)
116 #include <asm/syscall_table_n64.h> 115 #include <asm/syscall_table_n64.h>
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