1 /*
2 * This file is subject to the terms and condi
3 * License. See the file "COPYING" in the mai
4 * for more details.
5 *
6 * Copyright (C) 1994 - 2000, 2001, 2003 Ralf
7 * Copyright (C) 1999, 2000 Silicon Graphics,
8 * Copyright (C) 2001 MIPS Technologies, Inc.
9 */
10
11 #include <asm/asm.h>
12 #include <asm/asmmacro.h>
13 #include <asm/compiler.h>
14 #include <asm/irqflags.h>
15 #include <asm/regdef.h>
16 #include <asm/mipsregs.h>
17 #include <asm/stackframe.h>
18 #include <asm/isadep.h>
19 #include <asm/thread_info.h>
20
21 #ifndef CONFIG_PREEMPTION
22 #define resume_kernel restore_all
23 #else
24 #define __ret_from_irq ret_from_exception
25 #endif
26
27 .text
28 .align 5
29 #ifndef CONFIG_PREEMPTION
30 FEXPORT(ret_from_exception)
31 local_irq_disable
32 b __ret_from_irq
33 #endif
34 FEXPORT(ret_from_irq)
35 LONG_S s0, TI_REGS($28)
36 FEXPORT(__ret_from_irq)
37 /*
38 * We can be coming here from a syscall done i
39 * e.g. a failed kernel_execve().
40 */
41 resume_userspace_check:
42 LONG_L t0, PT_STATUS(sp)
43 andi t0, t0, KU_USER
44 beqz t0, resume_kernel
45
46 resume_userspace:
47 local_irq_disable # make
48 # inte
49 # betw
50 LONG_L a2, TI_FLAGS($28) # curr
51 andi t0, a2, _TIF_WORK_MASK # (ign
52 bnez t0, work_pending
53 j restore_all
54
55 #ifdef CONFIG_PREEMPTION
56 resume_kernel:
57 local_irq_disable
58 lw t0, TI_PRE_COUNT($28)
59 bnez t0, restore_all
60 LONG_L t0, TI_FLAGS($28)
61 andi t1, t0, _TIF_NEED_RESCHED
62 beqz t1, restore_all
63 LONG_L t0, PT_STATUS(sp)
64 andi t0, 1
65 beqz t0, restore_all
66 PTR_LA ra, restore_all
67 j preempt_schedule_irq
68 #endif
69
70 FEXPORT(ret_from_kernel_thread)
71 jal schedule_tail # a0 =
72 move a0, s1
73 jal s0
74 j syscall_exit
75
76 FEXPORT(ret_from_fork)
77 jal schedule_tail # a0 =
78
79 FEXPORT(syscall_exit)
80 #ifdef CONFIG_DEBUG_RSEQ
81 move a0, sp
82 jal rseq_syscall
83 #endif
84 local_irq_disable # make
85 # sign
86 # samp
87 LONG_L a2, TI_FLAGS($28) # curr
88 li t0, _TIF_ALLWORK_MASK
89 and t0, a2, t0
90 bnez t0, syscall_exit_work
91
92 restore_all: # rest
93 .set noat
94 RESTORE_TEMP
95 RESTORE_AT
96 RESTORE_STATIC
97 restore_partial: # restore part
98 #ifdef CONFIG_TRACE_IRQFLAGS
99 SAVE_STATIC
100 SAVE_AT
101 SAVE_TEMP
102 LONG_L v0, PT_STATUS(sp)
103 #if defined(CONFIG_CPU_R3000)
104 and v0, ST0_IEP
105 #else
106 and v0, ST0_IE
107 #endif
108 beqz v0, 1f
109 jal trace_hardirqs_on
110 b 2f
111 1: jal trace_hardirqs_off
112 2:
113 RESTORE_TEMP
114 RESTORE_AT
115 RESTORE_STATIC
116 #endif
117 RESTORE_SOME
118 RESTORE_SP_AND_RET
119 .set at
120
121 work_pending:
122 andi t0, a2, _TIF_NEED_RESCHED # a2
123 beqz t0, work_notifysig
124 work_resched:
125 TRACE_IRQS_OFF
126 jal schedule
127
128 local_irq_disable # make
129 # sign
130 # samp
131 LONG_L a2, TI_FLAGS($28)
132 andi t0, a2, _TIF_WORK_MASK # is t
133 # othe
134 beqz t0, restore_all
135 andi t0, a2, _TIF_NEED_RESCHED
136 bnez t0, work_resched
137
138 work_notifysig: # deal
139 # noti
140 move a0, sp
141 li a1, 0
142 jal do_notify_resume # a2 a
143 j resume_userspace_check
144
145 FEXPORT(syscall_exit_partial)
146 #ifdef CONFIG_DEBUG_RSEQ
147 move a0, sp
148 jal rseq_syscall
149 #endif
150 local_irq_disable # make
151 # chan
152 LONG_L a2, TI_FLAGS($28) # curr
153 li t0, _TIF_ALLWORK_MASK
154 and t0, a2
155 beqz t0, restore_partial
156 SAVE_STATIC
157 syscall_exit_work:
158 LONG_L t0, PT_STATUS(sp)
159 andi t0, t0, KU_USER
160 beqz t0, resume_kernel
161 li t0, _TIF_WORK_SYSCALL_EXIT
162 and t0, a2 # a2 i
163 beqz t0, work_pending # trac
164 local_irq_enable # coul
165 # call
166 TRACE_IRQS_ON
167 move a0, sp
168 jal syscall_trace_leave
169 b resume_userspace
170
171 #if defined(CONFIG_CPU_MIPSR2) || defined(CONF
172 defined(CONFIG_CPU_MIPSR6) || defined(CONF
173
174 /*
175 * MIPS32R2 Instruction Hazard Barrier - must
176 *
177 * For C code use the inline version named ins
178 */
179 LEAF(mips_ihb)
180 .set MIPS_ISA_LEVEL_RAW
181 jr.hb ra
182 nop
183 END(mips_ihb)
184
185 #endif /* CONFIG_CPU_MIPSR2 - CONFIG_CPU_MIPSR
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