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 #include <linux/config.h> 12 13 static inline int 14 setup_sigcontext(struct pt_regs *regs, struct sigcontext *sc) 15 { 16 int err = 0; 17 18 err |= __put_user(regs->cp0_epc, &sc->sc_pc); 19 20 #define save_gp_reg(i) do { \ 21 err |= __put_user(regs->regs[i], &sc->sc_regs[i]); \ 22 } while(0) 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); 31 save_gp_reg(31); 32 #undef save_gp_reg 33 34 #ifdef CONFIG_32BIT 35 err |= __put_user(regs->hi, &sc->sc_mdhi); 36 err |= __put_user(regs->lo, &sc->sc_mdlo); 37 if (cpu_has_dsp) { 38 err |= __put_user(mfhi1(), &sc->sc_hi1); 39 err |= __put_user(mflo1(), &sc->sc_lo1); 40 err |= __put_user(mfhi2(), &sc->sc_hi2); 41 err |= __put_user(mflo2(), &sc->sc_lo2); 42 err |= __put_user(mfhi3(), &sc->sc_hi3); 43 err |= __put_user(mflo3(), &sc->sc_lo3); 44 err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp); 45 } 46 #endif 47 #ifdef CONFIG_64BIT 48 err |= __put_user(regs->hi, &sc->sc_hi[0]); 49 err |= __put_user(regs->lo, &sc->sc_lo[0]); 50 if (cpu_has_dsp) { 51 err |= __put_user(mfhi1(), &sc->sc_hi[1]); 52 err |= __put_user(mflo1(), &sc->sc_lo[1]); 53 err |= __put_user(mfhi2(), &sc->sc_hi[2]); 54 err |= __put_user(mflo2(), &sc->sc_lo[2]); 55 err |= __put_user(mfhi3(), &sc->sc_hi[3]); 56 err |= __put_user(mflo3(), &sc->sc_lo[3]); 57 err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp); 58 } 59 #endif 60 61 err |= __put_user(!!used_math(), &sc->sc_used_math); 62 63 if (!used_math()) 64 goto out; 65 66 /* 67 * Save FPU state to signal context. Signal handler will "inherit" 68 * current FPU state. 69 */ 70 preempt_disable(); 71 72 if (!is_fpu_owner()) { 73 own_fpu(); 74 restore_fp(current); 75 } 76 err |= save_fp_context(sc); 77 78 preempt_enable(); 79 80 out: 81 return err; 82 } 83 84 static inline int 85 restore_sigcontext(struct pt_regs *regs, struct sigcontext *sc) 86 { 87 unsigned int used_math; 88 unsigned long treg; 89 int err = 0; 90 91 /* Always make any pending restarted system calls return -EINTR */ 92 current_thread_info()->restart_block.fn = do_no_restart_syscall; 93 94 err |= __get_user(regs->cp0_epc, &sc->sc_pc); 95 #ifdef CONFIG_32BIT 96 err |= __get_user(regs->hi, &sc->sc_mdhi); 97 err |= __get_user(regs->lo, &sc->sc_mdlo); 98 if (cpu_has_dsp) { 99 err |= __get_user(treg, &sc->sc_hi1); mthi1(treg); 100 err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg); 101 err |= __get_user(treg, &sc->sc_hi2); mthi2(treg); 102 err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg); 103 err |= __get_user(treg, &sc->sc_hi3); mthi3(treg); 104 err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg); 105 err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK); 106 } 107 #endif 108 #ifdef CONFIG_64BIT 109 err |= __get_user(regs->hi, &sc->sc_hi[0]); 110 err |= __get_user(regs->lo, &sc->sc_lo[0]); 111 if (cpu_has_dsp) { 112 err |= __get_user(treg, &sc->sc_hi[1]); mthi1(treg); 113 err |= __get_user(treg, &sc->sc_lo[1]); mthi1(treg); 114 err |= __get_user(treg, &sc->sc_hi[2]); mthi2(treg); 115 err |= __get_user(treg, &sc->sc_lo[2]); mthi2(treg); 116 err |= __get_user(treg, &sc->sc_hi[3]); mthi3(treg); 117 err |= __get_user(treg, &sc->sc_lo[3]); mthi3(treg); 118 err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK); 119 } 120 #endif 121 122 #define restore_gp_reg(i) do { \ 123 err |= __get_user(regs->regs[i], &sc->sc_regs[i]); \ 124 } while(0) 125 restore_gp_reg( 1); restore_gp_reg( 2); restore_gp_reg( 3); 126 restore_gp_reg( 4); restore_gp_reg( 5); restore_gp_reg( 6); 127 restore_gp_reg( 7); restore_gp_reg( 8); restore_gp_reg( 9); 128 restore_gp_reg(10); restore_gp_reg(11); restore_gp_reg(12); 129 restore_gp_reg(13); restore_gp_reg(14); restore_gp_reg(15); 130 restore_gp_reg(16); restore_gp_reg(17); restore_gp_reg(18); 131 restore_gp_reg(19); restore_gp_reg(20); restore_gp_reg(21); 132 restore_gp_reg(22); restore_gp_reg(23); restore_gp_reg(24); 133 restore_gp_reg(25); restore_gp_reg(26); restore_gp_reg(27); 134 restore_gp_reg(28); restore_gp_reg(29); restore_gp_reg(30); 135 restore_gp_reg(31); 136 #undef restore_gp_reg 137 138 err |= __get_user(used_math, &sc->sc_used_math); 139 conditional_used_math(used_math); 140 141 preempt_disable(); 142 143 if (used_math()) { 144 /* restore fpu context if we have used it before */ 145 own_fpu(); 146 err |= restore_fp_context(sc); 147 } else { 148 /* signal handler may have used FPU. Give it up. */ 149 lose_fpu(); 150 } 151 152 preempt_enable(); 153 154 return err; 155 } 156 157 /* 158 * Determine which stack to use.. 159 */ 160 static inline void * 161 get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size) 162 { 163 unsigned long sp; 164 165 /* Default to using normal stack */ 166 sp = regs->regs[29]; 167 168 /* 169 * FPU emulator may have it's own trampoline active just 170 * above the user stack, 16-bytes before the next lowest 171 * 16 byte boundary. Try to avoid trashing it. 172 */ 173 sp -= 32; 174 175 /* This is the X/Open sanctioned signal stack switching. */ 176 if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0)) 177 sp = current->sas_ss_sp + current->sas_ss_size; 178 179 return (void *)((sp - frame_size) & (ICACHE_REFILLS_WORKAROUND_WAR ? 32 : ALMASK)); 180 } 181 182 static inline int install_sigtramp(unsigned int __user *tramp, 183 unsigned int syscall) 184 { 185 int err; 186 187 /* 188 * Set up the return code ... 189 * 190 * li v0, __NR__foo_sigreturn 191 * syscall 192 */ 193 194 err = __put_user(0x24020000 + syscall, tramp + 0); 195 err |= __put_user(0x0000000c , tramp + 1); 196 if (ICACHE_REFILLS_WORKAROUND_WAR) { 197 err |= __put_user(0, tramp + 2); 198 err |= __put_user(0, tramp + 3); 199 err |= __put_user(0, tramp + 4); 200 err |= __put_user(0, tramp + 5); 201 err |= __put_user(0, tramp + 6); 202 err |= __put_user(0, tramp + 7); 203 } 204 flush_cache_sigtramp((unsigned long) tramp); 205 206 return err; 207 } 208