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Diffstat (limited to 'arch/mips/kernel/signal-common.h')
-rw-r--r--arch/mips/kernel/signal-common.h194
1 files changed, 41 insertions, 153 deletions
diff --git a/arch/mips/kernel/signal-common.h b/arch/mips/kernel/signal-common.h
index b1f09d54ebe6..9a8abd67ec5c 100644
--- a/arch/mips/kernel/signal-common.h
+++ b/arch/mips/kernel/signal-common.h
@@ -8,169 +8,57 @@
8 * Copyright (C) 1999, 2000 Silicon Graphics, Inc. 8 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
9 */ 9 */
10 10
11#ifndef __SIGNAL_COMMON_H
12#define __SIGNAL_COMMON_H
11 13
12static inline int 14/* #define DEBUG_SIG */
13setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
14{
15 int err = 0;
16 15
17 err |= __put_user(regs->cp0_epc, &sc->sc_pc); 16#ifdef DEBUG_SIG
17# define DEBUGP(fmt, args...) printk("%s: " fmt, __FUNCTION__ , ##args)
18#else
19# define DEBUGP(fmt, args...)
20#endif
18 21
19#define save_gp_reg(i) do { \ 22/*
20 err |= __put_user(regs->regs[i], &sc->sc_regs[i]); \ 23 * Horribly complicated - with the bloody RM9000 workarounds enabled
21} while(0) 24 * the signal trampolines is moving to the end of the structure so we can
22 __put_user(0, &sc->sc_regs[0]); save_gp_reg(1); save_gp_reg(2); 25 * increase the alignment without breaking software compatibility.
23 save_gp_reg(3); save_gp_reg(4); save_gp_reg(5); save_gp_reg(6); 26 */
24 save_gp_reg(7); save_gp_reg(8); save_gp_reg(9); save_gp_reg(10); 27#if ICACHE_REFILLS_WORKAROUND_WAR == 0
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 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 }
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
64out:
65 return err;
66}
67
68static inline int
69restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
70{
71 unsigned int used_math;
72 unsigned long treg;
73 int err = 0;
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);
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 }
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 28
107 err |= __get_user(used_math, &sc->sc_used_math); 29struct sigframe {
108 conditional_used_math(used_math); 30 u32 sf_ass[4]; /* argument save space for o32 */
31 u32 sf_code[2]; /* signal trampoline */
32 struct sigcontext sf_sc;
33 sigset_t sf_mask;
34};
109 35
110 preempt_disable(); 36#else /* ICACHE_REFILLS_WORKAROUND_WAR */
111 37
112 if (used_math()) { 38struct sigframe {
113 /* restore fpu context if we have used it before */ 39 u32 sf_ass[4]; /* argument save space for o32 */
114 own_fpu(); 40 u32 sf_pad[2];
115 err |= restore_fp_context(sc); 41 struct sigcontext sf_sc; /* hw context */
116 } else { 42 sigset_t sf_mask;
117 /* signal handler may have used FPU. Give it up. */ 43 u32 sf_code[8] ____cacheline_aligned; /* signal trampoline */
118 lose_fpu(); 44};
119 }
120 45
121 preempt_enable(); 46#endif /* !ICACHE_REFILLS_WORKAROUND_WAR */
122 47
123 return err; 48/*
124} 49 * handle hardware context
50 */
51extern int setup_sigcontext(struct pt_regs *, struct sigcontext __user *);
52extern int restore_sigcontext(struct pt_regs *, struct sigcontext __user *);
125 53
126/* 54/*
127 * Determine which stack to use.. 55 * Determine which stack to use..
128 */ 56 */
129static inline void __user * 57extern void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
130get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size) 58 size_t frame_size);
131{ 59/*
132 unsigned long sp; 60 * install trampoline code to get back from the sig handler
133 61 */
134 /* Default to using normal stack */ 62extern int install_sigtramp(unsigned int __user *tramp, unsigned int syscall);
135 sp = regs->regs[29];
136
137 /*
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;
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
148 return (void __user *)((sp - frame_size) & (ICACHE_REFILLS_WORKAROUND_WAR ? ~(cpu_icache_line_size()-1) : ALMASK));
149}
150
151static inline int install_sigtramp(unsigned int __user *tramp,
152 unsigned int syscall)
153{
154 int err;
155
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 63
175 return err; 64#endif /* __SIGNAL_COMMON_H */
176}
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