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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) 1991, 1992 Linus Torvalds | |
7 | * Copyright (C) 1994 - 2000 Ralf Baechle | |
8 | * Copyright (C) 1999, 2000 Silicon Graphics, Inc. | |
9 | */ | |
10 | ||
e50c0a8f | 11 | |
1da177e4 | 12 | static inline int |
9bbf28a3 | 13 | setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc) |
1da177e4 LT |
14 | { |
15 | int err = 0; | |
16 | ||
17 | err |= __put_user(regs->cp0_epc, &sc->sc_pc); | |
1da177e4 LT |
18 | |
19 | #define save_gp_reg(i) do { \ | |
20 | err |= __put_user(regs->regs[i], &sc->sc_regs[i]); \ | |
21 | } while(0) | |
22 | __put_user(0, &sc->sc_regs[0]); save_gp_reg(1); save_gp_reg(2); | |
23 | save_gp_reg(3); save_gp_reg(4); save_gp_reg(5); save_gp_reg(6); | |
24 | save_gp_reg(7); save_gp_reg(8); save_gp_reg(9); save_gp_reg(10); | |
25 | save_gp_reg(11); save_gp_reg(12); save_gp_reg(13); save_gp_reg(14); | |
26 | save_gp_reg(15); save_gp_reg(16); save_gp_reg(17); save_gp_reg(18); | |
27 | save_gp_reg(19); save_gp_reg(20); save_gp_reg(21); save_gp_reg(22); | |
28 | save_gp_reg(23); save_gp_reg(24); save_gp_reg(25); save_gp_reg(26); | |
29 | save_gp_reg(27); save_gp_reg(28); save_gp_reg(29); save_gp_reg(30); | |
30 | save_gp_reg(31); | |
31 | #undef save_gp_reg | |
32 | ||
33 | err |= __put_user(regs->hi, &sc->sc_mdhi); | |
34 | err |= __put_user(regs->lo, &sc->sc_mdlo); | |
e50c0a8f RB |
35 | if (cpu_has_dsp) { |
36 | err |= __put_user(mfhi1(), &sc->sc_hi1); | |
37 | err |= __put_user(mflo1(), &sc->sc_lo1); | |
38 | err |= __put_user(mfhi2(), &sc->sc_hi2); | |
39 | err |= __put_user(mflo2(), &sc->sc_lo2); | |
40 | err |= __put_user(mfhi3(), &sc->sc_hi3); | |
41 | err |= __put_user(mflo3(), &sc->sc_lo3); | |
42 | err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp); | |
43 | } | |
1da177e4 LT |
44 | |
45 | err |= __put_user(!!used_math(), &sc->sc_used_math); | |
46 | ||
47 | if (!used_math()) | |
48 | goto out; | |
49 | ||
50 | /* | |
51 | * Save FPU state to signal context. Signal handler will "inherit" | |
52 | * current FPU state. | |
53 | */ | |
54 | preempt_disable(); | |
55 | ||
56 | if (!is_fpu_owner()) { | |
57 | own_fpu(); | |
58 | restore_fp(current); | |
59 | } | |
60 | err |= save_fp_context(sc); | |
61 | ||
62 | preempt_enable(); | |
63 | ||
64 | out: | |
65 | return err; | |
66 | } | |
67 | ||
68 | static inline int | |
9bbf28a3 | 69 | restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc) |
1da177e4 | 70 | { |
1da177e4 | 71 | unsigned int used_math; |
e50c0a8f RB |
72 | unsigned long treg; |
73 | int err = 0; | |
1da177e4 LT |
74 | |
75 | /* Always make any pending restarted system calls return -EINTR */ | |
76 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
77 | ||
78 | err |= __get_user(regs->cp0_epc, &sc->sc_pc); | |
79 | err |= __get_user(regs->hi, &sc->sc_mdhi); | |
80 | err |= __get_user(regs->lo, &sc->sc_mdlo); | |
e50c0a8f RB |
81 | if (cpu_has_dsp) { |
82 | err |= __get_user(treg, &sc->sc_hi1); mthi1(treg); | |
83 | err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg); | |
84 | err |= __get_user(treg, &sc->sc_hi2); mthi2(treg); | |
85 | err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg); | |
86 | err |= __get_user(treg, &sc->sc_hi3); mthi3(treg); | |
87 | err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg); | |
88 | err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK); | |
89 | } | |
1da177e4 LT |
90 | |
91 | #define restore_gp_reg(i) do { \ | |
92 | err |= __get_user(regs->regs[i], &sc->sc_regs[i]); \ | |
93 | } while(0) | |
94 | restore_gp_reg( 1); restore_gp_reg( 2); restore_gp_reg( 3); | |
95 | restore_gp_reg( 4); restore_gp_reg( 5); restore_gp_reg( 6); | |
96 | restore_gp_reg( 7); restore_gp_reg( 8); restore_gp_reg( 9); | |
97 | restore_gp_reg(10); restore_gp_reg(11); restore_gp_reg(12); | |
98 | restore_gp_reg(13); restore_gp_reg(14); restore_gp_reg(15); | |
99 | restore_gp_reg(16); restore_gp_reg(17); restore_gp_reg(18); | |
100 | restore_gp_reg(19); restore_gp_reg(20); restore_gp_reg(21); | |
101 | restore_gp_reg(22); restore_gp_reg(23); restore_gp_reg(24); | |
102 | restore_gp_reg(25); restore_gp_reg(26); restore_gp_reg(27); | |
103 | restore_gp_reg(28); restore_gp_reg(29); restore_gp_reg(30); | |
104 | restore_gp_reg(31); | |
105 | #undef restore_gp_reg | |
106 | ||
107 | err |= __get_user(used_math, &sc->sc_used_math); | |
108 | conditional_used_math(used_math); | |
109 | ||
110 | preempt_disable(); | |
111 | ||
112 | if (used_math()) { | |
113 | /* restore fpu context if we have used it before */ | |
114 | own_fpu(); | |
115 | err |= restore_fp_context(sc); | |
116 | } else { | |
117 | /* signal handler may have used FPU. Give it up. */ | |
118 | lose_fpu(); | |
119 | } | |
120 | ||
121 | preempt_enable(); | |
122 | ||
123 | return err; | |
124 | } | |
125 | ||
126 | /* | |
127 | * Determine which stack to use.. | |
128 | */ | |
9bbf28a3 | 129 | static inline void __user * |
1da177e4 LT |
130 | get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size) |
131 | { | |
02416dcf | 132 | unsigned long sp; |
1da177e4 LT |
133 | |
134 | /* Default to using normal stack */ | |
135 | sp = regs->regs[29]; | |
136 | ||
137 | /* | |
a3dddd56 RB |
138 | * FPU emulator may have it's own trampoline active just |
139 | * above the user stack, 16-bytes before the next lowest | |
140 | * 16 byte boundary. Try to avoid trashing it. | |
141 | */ | |
142 | sp -= 32; | |
1da177e4 LT |
143 | |
144 | /* This is the X/Open sanctioned signal stack switching. */ | |
145 | if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0)) | |
146 | sp = current->sas_ss_sp + current->sas_ss_size; | |
147 | ||
387a154d | 148 | return (void __user *)((sp - frame_size) & (ICACHE_REFILLS_WORKAROUND_WAR ? ~(cpu_icache_line_size()-1) : ALMASK)); |
02416dcf RB |
149 | } |
150 | ||
151 | static inline int install_sigtramp(unsigned int __user *tramp, | |
152 | unsigned int syscall) | |
153 | { | |
154 | int err; | |
1da177e4 | 155 | |
02416dcf RB |
156 | /* |
157 | * Set up the return code ... | |
158 | * | |
159 | * li v0, __NR__foo_sigreturn | |
160 | * syscall | |
161 | */ | |
162 | ||
163 | err = __put_user(0x24020000 + syscall, tramp + 0); | |
164 | err |= __put_user(0x0000000c , tramp + 1); | |
165 | if (ICACHE_REFILLS_WORKAROUND_WAR) { | |
166 | err |= __put_user(0, tramp + 2); | |
167 | err |= __put_user(0, tramp + 3); | |
168 | err |= __put_user(0, tramp + 4); | |
169 | err |= __put_user(0, tramp + 5); | |
170 | err |= __put_user(0, tramp + 6); | |
171 | err |= __put_user(0, tramp + 7); | |
172 | } | |
173 | flush_cache_sigtramp((unsigned long) tramp); | |
174 | ||
175 | return err; | |
1da177e4 | 176 | } |