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
6 * Copyright (C) 1991, 1992 Linus Torvalds
7 * Copyright (C) 1994 - 2000 Ralf Baechle
8 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
11 #include <linux/config.h>
14 setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
18 err |= __put_user(regs->cp0_epc, &sc->sc_pc);
20 #define save_gp_reg(i) do { \
21 err |= __put_user(regs->regs[i], &sc->sc_regs[i]); \
23 __put_user(0, &sc->sc_regs[0]); save_gp_reg(1); save_gp_reg(2);
24 save_gp_reg(3); save_gp_reg(4); save_gp_reg(5); save_gp_reg(6);
25 save_gp_reg(7); save_gp_reg(8); save_gp_reg(9); save_gp_reg(10);
26 save_gp_reg(11); save_gp_reg(12); save_gp_reg(13); save_gp_reg(14);
27 save_gp_reg(15); save_gp_reg(16); save_gp_reg(17); save_gp_reg(18);
28 save_gp_reg(19); save_gp_reg(20); save_gp_reg(21); save_gp_reg(22);
29 save_gp_reg(23); save_gp_reg(24); save_gp_reg(25); save_gp_reg(26);
30 save_gp_reg(27); save_gp_reg(28); save_gp_reg(29); save_gp_reg(30);
34 err |= __put_user(regs->hi, &sc->sc_mdhi);
35 err |= __put_user(regs->lo, &sc->sc_mdlo);
37 err |= __put_user(mfhi1(), &sc->sc_hi1);
38 err |= __put_user(mflo1(), &sc->sc_lo1);
39 err |= __put_user(mfhi2(), &sc->sc_hi2);
40 err |= __put_user(mflo2(), &sc->sc_lo2);
41 err |= __put_user(mfhi3(), &sc->sc_hi3);
42 err |= __put_user(mflo3(), &sc->sc_lo3);
43 err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp);
46 err |= __put_user(!!used_math(), &sc->sc_used_math);
52 * Save FPU state to signal context. Signal handler will "inherit"
57 if (!is_fpu_owner()) {
61 err |= save_fp_context(sc);
70 restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
72 unsigned int used_math;
76 /* Always make any pending restarted system calls return -EINTR */
77 current_thread_info()->restart_block.fn = do_no_restart_syscall;
79 err |= __get_user(regs->cp0_epc, &sc->sc_pc);
80 err |= __get_user(regs->hi, &sc->sc_mdhi);
81 err |= __get_user(regs->lo, &sc->sc_mdlo);
83 err |= __get_user(treg, &sc->sc_hi1); mthi1(treg);
84 err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg);
85 err |= __get_user(treg, &sc->sc_hi2); mthi2(treg);
86 err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg);
87 err |= __get_user(treg, &sc->sc_hi3); mthi3(treg);
88 err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg);
89 err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK);
92 #define restore_gp_reg(i) do { \
93 err |= __get_user(regs->regs[i], &sc->sc_regs[i]); \
95 restore_gp_reg( 1); restore_gp_reg( 2); restore_gp_reg( 3);
96 restore_gp_reg( 4); restore_gp_reg( 5); restore_gp_reg( 6);
97 restore_gp_reg( 7); restore_gp_reg( 8); restore_gp_reg( 9);
98 restore_gp_reg(10); restore_gp_reg(11); restore_gp_reg(12);
99 restore_gp_reg(13); restore_gp_reg(14); restore_gp_reg(15);
100 restore_gp_reg(16); restore_gp_reg(17); restore_gp_reg(18);
101 restore_gp_reg(19); restore_gp_reg(20); restore_gp_reg(21);
102 restore_gp_reg(22); restore_gp_reg(23); restore_gp_reg(24);
103 restore_gp_reg(25); restore_gp_reg(26); restore_gp_reg(27);
104 restore_gp_reg(28); restore_gp_reg(29); restore_gp_reg(30);
106 #undef restore_gp_reg
108 err |= __get_user(used_math, &sc->sc_used_math);
109 conditional_used_math(used_math);
114 /* restore fpu context if we have used it before */
116 err |= restore_fp_context(sc);
118 /* signal handler may have used FPU. Give it up. */
128 * Determine which stack to use..
130 static inline void __user *
131 get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
135 /* Default to using normal stack */
139 * FPU emulator may have it's own trampoline active just
140 * above the user stack, 16-bytes before the next lowest
141 * 16 byte boundary. Try to avoid trashing it.
145 /* This is the X/Open sanctioned signal stack switching. */
146 if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0))
147 sp = current->sas_ss_sp + current->sas_ss_size;
149 return (void __user *)((sp - frame_size) & (ICACHE_REFILLS_WORKAROUND_WAR ? ~(cpu_icache_line_size()-1) : ALMASK));
152 static inline int install_sigtramp(unsigned int __user *tramp,
153 unsigned int syscall)
158 * Set up the return code ...
160 * li v0, __NR__foo_sigreturn
164 err = __put_user(0x24020000 + syscall, tramp + 0);
165 err |= __put_user(0x0000000c , tramp + 1);
166 if (ICACHE_REFILLS_WORKAROUND_WAR) {
167 err |= __put_user(0, tramp + 2);
168 err |= __put_user(0, tramp + 3);
169 err |= __put_user(0, tramp + 4);
170 err |= __put_user(0, tramp + 5);
171 err |= __put_user(0, tramp + 6);
172 err |= __put_user(0, tramp + 7);
174 flush_cache_sigtramp((unsigned long) tramp);