1/* Get current user context. 2 Copyright (C) 2008-2021 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 21#include "ucontext_i.h" 22 23 24 /* Trampoline function. Non-standard calling ABI. */ 25 /* Can not use ENTRY(__getcontext_ret) here. */ 26 .type __getcontext_ret, @function 27 .hidden __getcontext_ret 28__getcontext_ret: 29 .proc 30 .callinfo FRAME=0,NO_CALLS 31 /* r26-r23 contain original r3-r6, but because setcontext 32 does not reload r3-r6 (it's using them as temporaries) 33 we must save them elsewhere and swap them back in. */ 34 copy %r23, %r3 35 copy %r24, %r4 36 copy %r25, %r5 37 copy %r26, %r6 38 /* r20 contains original return pointer. */ 39 bv 0(%r20) 40 copy %r0, %ret0 41 .procend 42 .size __getcontext_ret, .-__getcontext_ret 43 44 45ENTRY(__getcontext) 46 /* Save the registers. */ 47 stw %r0, oR0(%r26) 48 stw %r1, oR1(%r26) 49 /* stw %r2, oR2(%r26) - used for trampoline. */ 50 stw %r3, oR3(%r26) 51 stw %r4, oR4(%r26) 52 stw %r5, oR5(%r26) 53 stw %r6, oR6(%r26) 54 stw %r7, oR7(%r26) 55 stw %r8, oR8(%r26) 56 stw %r9, oR9(%r26) 57 stw %r10, oR10(%r26) 58 stw %r11, oR11(%r26) 59 stw %r12, oR12(%r26) 60 stw %r13, oR13(%r26) 61 stw %r14, oR14(%r26) 62 stw %r15, oR15(%r26) 63 stw %r16, oR16(%r26) 64 stw %r17, oR17(%r26) 65 stw %r18, oR18(%r26) 66 stw %r19, oR19(%r26) 67 /* stw %r20, oR20(%r26) - used for trampoline. */ 68 stw %r21, oR21(%r26) 69 stw %r22, oR22(%r26) 70 /* stw %r23, oR23(%r26) - used for trampoline. */ 71 /* stw %r24, oR24(%r26) - used for trampoline. */ 72 /* stw %r25, oR25(%r26) - used for trampoline. */ 73 /* stw %r26, oR26(%r26) - used for trampoline. */ 74 stw %r27, oR27(%r26) 75 stw %r28, oR28(%r26) 76 stw %r29, oR29(%r26) 77 stw %sp, oR30(%r26) 78 stw %r31, oR31(%r26) 79 80 stw %r0, oUC_FLAGS(%r26) 81 /* stw %r0, oUC_LINK(%r26) - Do not overwrite. */ 82 stw %sp, oSS_SP(%r26) 83 stw %r0, oSS_FLAGS(%r26) 84 stw %r0, oSS_SIZE(%r26) 85 86 stw %r0, oSC_FLAGS(%r26) 87 88 stw %r0, oIASQ0(%r26) 89 stw %r0, oIASQ1(%r26) 90 stw %r0, oIAOQ0(%r26) 91 stw %r0, oIAOQ1(%r26) 92 stw %r0, oSAR(%r26) /* used as flag in swapcontext(). */ 93 94 95 /* Store floating-point regs. */ 96 ldo oFPREGS0(%r26),%r1 97 fstds,ma %fr0, 8(%r1) 98 fstds,ma %fr1, 8(%r1) 99 fstds,ma %fr2, 8(%r1) 100 fstds,ma %fr3, 8(%r1) 101 fstds,ma %fr4, 8(%r1) 102 fstds,ma %fr5, 8(%r1) 103 fstds,ma %fr6, 8(%r1) 104 fstds,ma %fr7, 8(%r1) 105 fstds,ma %fr8, 8(%r1) 106 fstds,ma %fr9, 8(%r1) 107 fstds,ma %fr10, 8(%r1) 108 fstds,ma %fr11, 8(%r1) 109 fstds,ma %fr12, 8(%r1) 110 fstds,ma %fr13, 8(%r1) 111 fstds,ma %fr14, 8(%r1) 112 fstds,ma %fr15, 8(%r1) 113 fstds,ma %fr16, 8(%r1) 114 fstds,ma %fr17, 8(%r1) 115 fstds,ma %fr18, 8(%r1) 116 fstds,ma %fr19, 8(%r1) 117 fstds,ma %fr20, 8(%r1) 118 fstds,ma %fr21, 8(%r1) 119 fstds,ma %fr22, 8(%r1) 120 fstds,ma %fr23, 8(%r1) 121 fstds,ma %fr24, 8(%r1) 122 fstds,ma %fr25, 8(%r1) 123 fstds,ma %fr26, 8(%r1) 124 fstds,ma %fr27, 8(%r1) 125 fstds,ma %fr28, 8(%r1) 126 fstds,ma %fr29, 8(%r1) 127 fstds,ma %fr30, 8(%r1) 128 fstds %fr31, 0(%r1) 129 130 /* Prologue */ 131 stw %r2, -20(%sp) 132 .cfi_offset 2, -20 133 stwm %r4, 64(%sp) 134 .cfi_def_cfa_offset -64 135 .cfi_offset 4, 0 136#ifdef PIC 137 stw %r19, -32(%sp) 138 .cfi_offset 19, 32 139#endif 140 141 /* Set up the trampoline registers. 142 r20, r23, r24, r25, r26 and r2 are clobbered 143 by call to getcontext() anyway. Reuse them. */ 144 stw %r2, oR20(%r26) 145 stw %r3, oR23(%r26) 146 stw %r4, oR24(%r26) 147 stw %r5, oR25(%r26) 148 stw %r6, oR26(%r26) 149#ifdef PIC 150 addil LT%__getcontext_ret, %r19 151 ldw RT%__getcontext_ret(%r1), %r1 152#else 153 ldil L%__getcontext_ret, %r1 154 ldo R%__getcontext_ret(%r1), %r1 155#endif 156 stw %r1, oR2(%r26) 157 158 /* Save the current signal mask. */ 159 /* sigprocmask(SIG_BLOCK, NULL, &ucp->uc_sigmask); */ 160 ldo oSIGMASK(%r26), %r24 161 copy %r0, %r25 162 bl __sigprocmask, %r2 163 ldi SIG_BLOCK, %r26 164 165 /* Epilogue */ 166 ldw -84(%sp), %r2 167#ifdef PIC 168 ldw -32(%sp), %r19 169#endif 170 bv %r0(%r2) 171 ldwm -64(%sp), %r4 172END(__getcontext) 173 174weak_alias (__getcontext, getcontext) 175