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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 | ||
11 | static inline int | |
12 | setup_sigcontext(struct pt_regs *regs, struct sigcontext *sc) | |
13 | { | |
14 | int err = 0; | |
15 | ||
16 | err |= __put_user(regs->cp0_epc, &sc->sc_pc); | |
17 | err |= __put_user(regs->cp0_status, &sc->sc_status); | |
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); | |
35 | err |= __put_user(regs->cp0_cause, &sc->sc_cause); | |
36 | err |= __put_user(regs->cp0_badvaddr, &sc->sc_badvaddr); | |
37 | ||
38 | err |= __put_user(!!used_math(), &sc->sc_used_math); | |
39 | ||
40 | if (!used_math()) | |
41 | goto out; | |
42 | ||
43 | /* | |
44 | * Save FPU state to signal context. Signal handler will "inherit" | |
45 | * current FPU state. | |
46 | */ | |
47 | preempt_disable(); | |
48 | ||
49 | if (!is_fpu_owner()) { | |
50 | own_fpu(); | |
51 | restore_fp(current); | |
52 | } | |
53 | err |= save_fp_context(sc); | |
54 | ||
55 | preempt_enable(); | |
56 | ||
57 | out: | |
58 | return err; | |
59 | } | |
60 | ||
61 | static inline int | |
62 | restore_sigcontext(struct pt_regs *regs, struct sigcontext *sc) | |
63 | { | |
64 | int err = 0; | |
65 | unsigned int used_math; | |
66 | ||
67 | /* Always make any pending restarted system calls return -EINTR */ | |
68 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
69 | ||
70 | err |= __get_user(regs->cp0_epc, &sc->sc_pc); | |
71 | err |= __get_user(regs->hi, &sc->sc_mdhi); | |
72 | err |= __get_user(regs->lo, &sc->sc_mdlo); | |
73 | ||
74 | #define restore_gp_reg(i) do { \ | |
75 | err |= __get_user(regs->regs[i], &sc->sc_regs[i]); \ | |
76 | } while(0) | |
77 | restore_gp_reg( 1); restore_gp_reg( 2); restore_gp_reg( 3); | |
78 | restore_gp_reg( 4); restore_gp_reg( 5); restore_gp_reg( 6); | |
79 | restore_gp_reg( 7); restore_gp_reg( 8); restore_gp_reg( 9); | |
80 | restore_gp_reg(10); restore_gp_reg(11); restore_gp_reg(12); | |
81 | restore_gp_reg(13); restore_gp_reg(14); restore_gp_reg(15); | |
82 | restore_gp_reg(16); restore_gp_reg(17); restore_gp_reg(18); | |
83 | restore_gp_reg(19); restore_gp_reg(20); restore_gp_reg(21); | |
84 | restore_gp_reg(22); restore_gp_reg(23); restore_gp_reg(24); | |
85 | restore_gp_reg(25); restore_gp_reg(26); restore_gp_reg(27); | |
86 | restore_gp_reg(28); restore_gp_reg(29); restore_gp_reg(30); | |
87 | restore_gp_reg(31); | |
88 | #undef restore_gp_reg | |
89 | ||
90 | err |= __get_user(used_math, &sc->sc_used_math); | |
91 | conditional_used_math(used_math); | |
92 | ||
93 | preempt_disable(); | |
94 | ||
95 | if (used_math()) { | |
96 | /* restore fpu context if we have used it before */ | |
97 | own_fpu(); | |
98 | err |= restore_fp_context(sc); | |
99 | } else { | |
100 | /* signal handler may have used FPU. Give it up. */ | |
101 | lose_fpu(); | |
102 | } | |
103 | ||
104 | preempt_enable(); | |
105 | ||
106 | return err; | |
107 | } | |
108 | ||
109 | /* | |
110 | * Determine which stack to use.. | |
111 | */ | |
112 | static inline void * | |
113 | get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size) | |
114 | { | |
115 | unsigned long sp, almask; | |
116 | ||
117 | /* Default to using normal stack */ | |
118 | sp = regs->regs[29]; | |
119 | ||
120 | /* | |
121 | * FPU emulator may have it's own trampoline active just | |
122 | * above the user stack, 16-bytes before the next lowest | |
123 | * 16 byte boundary. Try to avoid trashing it. | |
124 | */ | |
125 | sp -= 32; | |
126 | ||
127 | /* This is the X/Open sanctioned signal stack switching. */ | |
128 | if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0)) | |
129 | sp = current->sas_ss_sp + current->sas_ss_size; | |
130 | ||
131 | if (PLAT_TRAMPOLINE_STUFF_LINE) | |
132 | almask = ~(PLAT_TRAMPOLINE_STUFF_LINE - 1); | |
133 | else | |
134 | almask = ALMASK; | |
135 | ||
136 | return (void *)((sp - frame_size) & almask); | |
137 | } |