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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, 96, 97, 98, 99, 2000, 01 by Ralf Baechle | |
7 | * Copyright (C) 1999, 2000 Silicon Graphics, Inc. | |
8 | * Copyright (C) 2001 MIPS Technologies, Inc. | |
9 | */ | |
1da177e4 LT |
10 | #include <linux/errno.h> |
11 | #include <asm/asm.h> | |
12 | #include <asm/asmmacro.h> | |
192ef366 | 13 | #include <asm/irqflags.h> |
1da177e4 LT |
14 | #include <asm/mipsregs.h> |
15 | #include <asm/regdef.h> | |
16 | #include <asm/stackframe.h> | |
17 | #include <asm/thread_info.h> | |
18 | #include <asm/unistd.h> | |
19 | ||
1da177e4 LT |
20 | #ifndef CONFIG_MIPS32_O32 |
21 | /* No O32, so define handle_sys here */ | |
22 | #define handle_sysn32 handle_sys | |
23 | #endif | |
24 | ||
70342287 | 25 | .align 5 |
1da177e4 LT |
26 | NESTED(handle_sysn32, PT_SIZE, sp) |
27 | #ifndef CONFIG_MIPS32_O32 | |
28 | .set noat | |
29 | SAVE_SOME | |
eae6c0da | 30 | TRACE_IRQS_ON_RELOAD |
1da177e4 LT |
31 | STI |
32 | .set at | |
33 | #endif | |
34 | ||
35 | dsubu t0, v0, __NR_N32_Linux # check syscall number | |
be856439 | 36 | sltiu t0, t0, __NR_N32_Linux_syscalls |
1da177e4 LT |
37 | |
38 | #ifndef CONFIG_MIPS32_O32 | |
39 | ld t1, PT_EPC(sp) # skip syscall on return | |
40 | daddiu t1, 4 # skip to next instruction | |
41 | sd t1, PT_EPC(sp) | |
42 | #endif | |
43 | beqz t0, not_n32_scall | |
44 | ||
1da177e4 LT |
45 | sd a3, PT_R26(sp) # save a3 for syscall restarting |
46 | ||
e7f3b48a | 47 | li t1, _TIF_WORK_SYSCALL_ENTRY |
1da177e4 LT |
48 | LONG_L t0, TI_FLAGS($28) # syscall tracing enabled? |
49 | and t0, t1, t0 | |
50 | bnez t0, n32_syscall_trace_entry | |
51 | ||
d218af78 | 52 | syscall_common: |
a400bed6 MR |
53 | dsll t0, v0, 3 # offset into table |
54 | ld t2, (sysn32_call_table - (__NR_N32_Linux * 8))(t0) | |
55 | ||
1da177e4 LT |
56 | jalr t2 # Do The Real Thing (TM) |
57 | ||
58 | li t0, -EMAXERRNO - 1 # error? | |
59 | sltu t0, t0, v0 | |
60 | sd t0, PT_R7(sp) # set error flag | |
61 | beqz t0, 1f | |
62 | ||
8f5a00eb | 63 | ld t1, PT_R2(sp) # syscall number |
1da177e4 | 64 | dnegu v0 # error |
8f5a00eb | 65 | sd t1, PT_R0(sp) # save it for syscall restarting |
1da177e4 LT |
66 | 1: sd v0, PT_R2(sp) # result |
67 | ||
02f884ed | 68 | j syscall_exit_partial |
1da177e4 LT |
69 | |
70 | /* ------------------------------------------------------------------------ */ | |
71 | ||
72 | n32_syscall_trace_entry: | |
73 | SAVE_STATIC | |
1da177e4 | 74 | move a0, sp |
9f161439 | 75 | move a1, v0 |
8b659a39 | 76 | jal syscall_trace_enter |
1da177e4 | 77 | |
d218af78 | 78 | bltz v0, 1f # seccomp failed? Skip syscall |
9d37c405 | 79 | |
04a7052c | 80 | RESTORE_STATIC |
a400bed6 | 81 | ld v0, PT_R2(sp) # Restore syscall (maybe modified) |
1da177e4 LT |
82 | ld a0, PT_R4(sp) # Restore argument registers |
83 | ld a1, PT_R5(sp) | |
84 | ld a2, PT_R6(sp) | |
85 | ld a3, PT_R7(sp) | |
86 | ld a4, PT_R8(sp) | |
87 | ld a5, PT_R9(sp) | |
a400bed6 MR |
88 | |
89 | dsubu t2, v0, __NR_N32_Linux # check (new) syscall number | |
be856439 | 90 | sltiu t0, t2, __NR_N32_Linux_syscalls |
a400bed6 MR |
91 | beqz t0, not_n32_scall |
92 | ||
d218af78 | 93 | j syscall_common |
1da177e4 | 94 | |
d218af78 | 95 | 1: j syscall_exit |
1da177e4 LT |
96 | |
97 | not_n32_scall: | |
98 | /* This is not an n32 compatibility syscall, pass it on to | |
99 | the n64 syscall handlers. */ | |
100 | j handle_sys64 | |
101 | ||
102 | END(handle_sysn32) | |
103 | ||
dc7077f8 | 104 | #define __SYSCALL(nr, entry) PTR entry |
43dec430 | 105 | .type sysn32_call_table, @object |
1da177e4 | 106 | EXPORT(sysn32_call_table) |
99bf73eb FK |
107 | #include <asm/syscall_table_64_n32.h> |
108 | #undef __SYSCALL |