1/* Save and set current context. 2 Copyright (C) 2009-2022 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library. If not, see 17 <https://www.gnu.org/licenses/>. */ 18 19#include <sysdep.h> 20#include <sys/asm.h> 21#include <sys/fpregdef.h> 22#include <sys/regdef.h> 23 24#include "ucontext_i.h" 25 26/* int swapcontext (ucontext_t *oucp, const ucontext_t *ucp) */ 27 28 .text 29 .set nomips16 30LOCALSZ = 0 31ARGSZ = 0 32MASK = 0x00000000 33#ifdef __PIC__ 34LOCALSZ = 1 /* save gp */ 35#endif 36#if _MIPS_SIM != _ABIO32 37ARGSZ = 1 /* save a1 */ 38# ifdef __PIC__ 39MASK = 0x10000000 40# endif 41#endif 42FRAMESZ = (((ARGSZ + LOCALSZ) * SZREG) + ALSZ) & ALMASK 43GPOFF = FRAMESZ - ((ARGSZ + 1) * SZREG) 44#if _MIPS_SIM != _ABIO32 45A1OFF = FRAMESZ - (1 * SZREG) /* callee-allocated */ 46#else 47A1OFF = FRAMESZ + (1 * SZREG) /* caller-allocated */ 48#endif 49MCONTEXT_GREGSZ = 8 50#if _MIPS_SIM == _ABIO32 && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ 51MCONTEXT_GREGOFF = 4 52#else 53MCONTEXT_GREGOFF = 0 54#endif 55 56NESTED (__swapcontext, FRAMESZ, ra) 57 .mask MASK, -(ARGSZ * SZREG) 58 .fmask 0x00000000, 0 59 60#ifdef __PIC__ 61 SETUP_GP 62 63 move a2, sp 64# define _SP a2 65 66# if _MIPS_SIM != _ABIO32 67 move a3, gp 68# define _GP a3 69# endif 70 71 PTR_ADDIU sp, -FRAMESZ 72 cfi_adjust_cfa_offset (FRAMESZ) 73 SETUP_GP64_STACK (GPOFF, __swapcontext) 74 SAVE_GP (GPOFF) 75 76#else /* ! __PIC__ */ 77# define _SP sp 78# define _GP gp 79 80#endif /* ! __PIC__ */ 81 82#ifdef PROF 83 .set noat 84 move AT, ra 85 jal _mcount 86 .set at 87#endif 88 89 REG_S s0, (MCONTEXT_GREGOFF + 16 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0) 90 REG_S s1, (MCONTEXT_GREGOFF + 17 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0) 91 REG_S s2, (MCONTEXT_GREGOFF + 18 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0) 92 REG_S s3, (MCONTEXT_GREGOFF + 19 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0) 93 REG_S s4, (MCONTEXT_GREGOFF + 20 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0) 94 REG_S s5, (MCONTEXT_GREGOFF + 21 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0) 95 REG_S s6, (MCONTEXT_GREGOFF + 22 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0) 96 REG_S s7, (MCONTEXT_GREGOFF + 23 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0) 97#if ! defined (__PIC__) || _MIPS_SIM != _ABIO32 98 REG_S _GP, (MCONTEXT_GREGOFF + 28 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0) 99#endif 100 REG_S _SP, (MCONTEXT_GREGOFF + 29 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0) 101 REG_S fp, (MCONTEXT_GREGOFF + 30 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0) 102 REG_S ra, (MCONTEXT_GREGOFF + 31 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0) 103 REG_S ra, (MCONTEXT_GREGOFF + MCONTEXT_PC)(a0) 104 105#ifdef __mips_hard_float 106# if _MIPS_SIM == _ABI64 107 s.d fs0, (24 * SZREG + MCONTEXT_FPREGS)(a0) 108 s.d fs1, (25 * SZREG + MCONTEXT_FPREGS)(a0) 109 s.d fs2, (26 * SZREG + MCONTEXT_FPREGS)(a0) 110 s.d fs3, (27 * SZREG + MCONTEXT_FPREGS)(a0) 111 s.d fs4, (28 * SZREG + MCONTEXT_FPREGS)(a0) 112 s.d fs5, (29 * SZREG + MCONTEXT_FPREGS)(a0) 113 s.d fs6, (30 * SZREG + MCONTEXT_FPREGS)(a0) 114 s.d fs7, (31 * SZREG + MCONTEXT_FPREGS)(a0) 115 116# else /* _MIPS_SIM != _ABI64 */ 117 s.d fs0, (20 * SZREG + MCONTEXT_FPREGS)(a0) 118 s.d fs1, (22 * SZREG + MCONTEXT_FPREGS)(a0) 119 s.d fs2, (24 * SZREG + MCONTEXT_FPREGS)(a0) 120 s.d fs3, (26 * SZREG + MCONTEXT_FPREGS)(a0) 121 s.d fs4, (28 * SZREG + MCONTEXT_FPREGS)(a0) 122 s.d fs5, (30 * SZREG + MCONTEXT_FPREGS)(a0) 123 124# endif /* _MIPS_SIM != _ABI64 */ 125 126 cfc1 v1, fcr31 127 sw v1, MCONTEXT_FPC_CSR(a0) 128#endif /* __mips_hard_float */ 129 130 REG_S a1, A1OFF(sp) 131 132/* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, &oucp->uc_sigmask, _NSIG8) */ 133 li a3, _NSIG8 134 PTR_ADDU a2, a0, UCONTEXT_SIGMASK 135 PTR_ADDU a1, a1, UCONTEXT_SIGMASK 136 li a0, SIG_SETMASK 137 138 li v0, SYS_ify (rt_sigprocmask) 139 syscall 140 bnez a3, 99f 141 142 REG_L v0, A1OFF(sp) 143 144#ifdef __mips_hard_float 145# if _MIPS_SIM == _ABI64 146 l.d fs0, (24 * SZREG + MCONTEXT_FPREGS)(v0) 147 l.d fs1, (25 * SZREG + MCONTEXT_FPREGS)(v0) 148 l.d fs2, (26 * SZREG + MCONTEXT_FPREGS)(v0) 149 l.d fs3, (27 * SZREG + MCONTEXT_FPREGS)(v0) 150 l.d fs4, (28 * SZREG + MCONTEXT_FPREGS)(v0) 151 l.d fs5, (29 * SZREG + MCONTEXT_FPREGS)(v0) 152 l.d fs6, (30 * SZREG + MCONTEXT_FPREGS)(v0) 153 l.d fs7, (31 * SZREG + MCONTEXT_FPREGS)(v0) 154 155# else /* _MIPS_SIM != _ABI64 */ 156 l.d fs0, (20 * SZREG + MCONTEXT_FPREGS)(v0) 157 l.d fs1, (22 * SZREG + MCONTEXT_FPREGS)(v0) 158 l.d fs2, (24 * SZREG + MCONTEXT_FPREGS)(v0) 159 l.d fs3, (26 * SZREG + MCONTEXT_FPREGS)(v0) 160 l.d fs4, (28 * SZREG + MCONTEXT_FPREGS)(v0) 161 l.d fs5, (30 * SZREG + MCONTEXT_FPREGS)(v0) 162 163# endif /* _MIPS_SIM != _ABI64 */ 164 165 lw v1, MCONTEXT_FPC_CSR(v0) 166 ctc1 v1, fcr31 167#endif /* __mips_hard_float */ 168 169 /* Note the contents of argument registers will be random 170 unless makecontext() has been called. */ 171 REG_L a0, (MCONTEXT_GREGOFF + 4 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) 172 REG_L a1, (MCONTEXT_GREGOFF + 5 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) 173 REG_L a2, (MCONTEXT_GREGOFF + 6 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) 174 REG_L a3, (MCONTEXT_GREGOFF + 7 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) 175#if _MIPS_SIM != _ABIO32 176 REG_L a4, (MCONTEXT_GREGOFF + 8 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) 177 REG_L a5, (MCONTEXT_GREGOFF + 9 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) 178 REG_L a6, (MCONTEXT_GREGOFF + 10 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) 179 REG_L a7, (MCONTEXT_GREGOFF + 11 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) 180#endif 181 182 REG_L s0, (MCONTEXT_GREGOFF + 16 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) 183 REG_L s1, (MCONTEXT_GREGOFF + 17 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) 184 REG_L s2, (MCONTEXT_GREGOFF + 18 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) 185 REG_L s3, (MCONTEXT_GREGOFF + 19 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) 186 REG_L s4, (MCONTEXT_GREGOFF + 20 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) 187 REG_L s5, (MCONTEXT_GREGOFF + 21 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) 188 REG_L s6, (MCONTEXT_GREGOFF + 22 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) 189 REG_L s7, (MCONTEXT_GREGOFF + 23 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) 190#if ! defined (__PIC__) || _MIPS_SIM != _ABIO32 191 REG_L gp, (MCONTEXT_GREGOFF + 28 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) 192#endif 193 REG_L sp, (MCONTEXT_GREGOFF + 29 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) 194 REG_L fp, (MCONTEXT_GREGOFF + 30 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) 195 REG_L ra, (MCONTEXT_GREGOFF + 31 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0) 196 REG_L t9, (MCONTEXT_GREGOFF + MCONTEXT_PC)(v0) 197 198 move v0, zero 199 jr t9 200 20199: 202#ifdef __PIC__ 203 PTR_LA t9, JUMPTARGET (__syscall_error) 204 RESTORE_GP64_STACK 205 PTR_ADDIU sp, FRAMESZ 206 cfi_adjust_cfa_offset (-FRAMESZ) 207 jr t9 208 209#else /* ! __PIC__ */ 210 211 j JUMPTARGET (__syscall_error) 212#endif /* ! __PIC__ */ 213PSEUDO_END (__swapcontext) 214 215weak_alias (__swapcontext, swapcontext) 216