switchcontext.S revision 1.1.1.2
1 /* PowerPC support code for fibers and multithreading. 2 Copyright (C) 2019-2020 Free Software Foundation, Inc. 3 4 This file is part of GCC. 5 6 GCC is free software; you can redistribute it and/or modify it under 7 the terms of the GNU General Public License as published by the Free 8 Software Foundation; either version 3, or (at your option) any later 9 version. 10 11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY 12 WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 for more details. 15 16 Under Section 7 of GPL version 3, you are granted additional 17 permissions described in the GCC Runtime Library Exception, version 18 3.1, as published by the Free Software Foundation. 19 20 You should have received a copy of the GNU General Public License and 21 a copy of the GCC Runtime Library Exception along with this program; 22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23 <http://www.gnu.org/licenses/>. */ 24 25 #include "../common/threadasm.S" 26 27 #if !defined(__PPC64__) 28 29 /** 30 * Performs a context switch. 31 * 32 * r3 - old context pointer 33 * r4 - new context pointer 34 * 35 */ 36 .text 37 .globl CSYM(fiber_switchContext) 38 .type CSYM(fiber_switchContext), @function 39 .align 2 40 CSYM(fiber_switchContext): 41 .cfi_startproc 42 /* Save linkage area */ 43 mflr 0 44 mfcr 5 45 stw 0, 8(1) 46 stw 5, 4(1) 47 48 /* Save GPRs */ 49 stw 11, (-1 * 4)(1) 50 stw 13, (-2 * 4)(1) 51 stw 14, (-3 * 4)(1) 52 stw 15, (-4 * 4)(1) 53 stw 16, (-5 * 4)(1) 54 stw 17, (-6 * 4)(1) 55 stw 18, (-7 * 4)(1) 56 stw 19, (-8 * 4)(1) 57 stw 20, (-9 * 4)(1) 58 stw 21, (-10 * 4)(1) 59 stw 22, (-11 * 4)(1) 60 stw 23, (-12 * 4)(1) 61 stw 24, (-13 * 4)(1) 62 stw 25, (-14 * 4)(1) 63 stw 26, (-15 * 4)(1) 64 stw 27, (-16 * 4)(1) 65 stw 28, (-17 * 4)(1) 66 stw 29, (-18 * 4)(1) 67 stw 30, (-19 * 4)(1) 68 stwu 31, (-20 * 4)(1) 69 70 /* We update the stack pointer here, since we do not want the GC to 71 scan the floating point registers. */ 72 73 /* Save FPRs */ 74 stfd 14, (-1 * 8)(1) 75 stfd 15, (-2 * 8)(1) 76 stfd 16, (-3 * 8)(1) 77 stfd 17, (-4 * 8)(1) 78 stfd 18, (-5 * 8)(1) 79 stfd 19, (-6 * 8)(1) 80 stfd 20, (-7 * 8)(1) 81 stfd 21, (-8 * 8)(1) 82 stfd 22, (-9 * 8)(1) 83 stfd 23, (-10 * 8)(1) 84 stfd 24, (-11 * 8)(1) 85 stfd 25, (-12 * 8)(1) 86 stfd 26, (-13 * 8)(1) 87 stfd 27, (-14 * 8)(1) 88 stfd 28, (-15 * 8)(1) 89 stfd 29, (-16 * 8)(1) 90 stfd 30, (-17 * 8)(1) 91 stfd 31, (-18 * 8)(1) 92 93 /* Update the old stack pointer */ 94 stw 1, 0(3) 95 96 /* Set new stack pointer */ 97 addi 1, 4, 20 * 4 98 99 /* Restore linkage area */ 100 lwz 0, 8(1) 101 lwz 5, 4(1) 102 103 /* Restore GPRs */ 104 lwz 11, (-1 * 4)(1) 105 lwz 13, (-2 * 4)(1) 106 lwz 14, (-3 * 4)(1) 107 lwz 15, (-4 * 4)(1) 108 lwz 16, (-5 * 4)(1) 109 lwz 17, (-6 * 4)(1) 110 lwz 18, (-7 * 4)(1) 111 lwz 19, (-8 * 4)(1) 112 lwz 20, (-9 * 4)(1) 113 lwz 21, (-10 * 4)(1) 114 lwz 22, (-11 * 4)(1) 115 lwz 23, (-12 * 4)(1) 116 lwz 24, (-13 * 4)(1) 117 lwz 25, (-14 * 4)(1) 118 lwz 26, (-15 * 4)(1) 119 lwz 27, (-16 * 4)(1) 120 lwz 28, (-17 * 4)(1) 121 lwz 29, (-18 * 4)(1) 122 lwz 30, (-19 * 4)(1) 123 lwz 31, (-20 * 4)(1) 124 125 /* Restore FPRs */ 126 lfd 14, (-1 * 8)(4) 127 lfd 15, (-2 * 8)(4) 128 lfd 16, (-3 * 8)(4) 129 lfd 17, (-4 * 8)(4) 130 lfd 18, (-5 * 8)(4) 131 lfd 19, (-6 * 8)(4) 132 lfd 20, (-7 * 8)(4) 133 lfd 21, (-8 * 8)(4) 134 lfd 22, (-9 * 8)(4) 135 lfd 23, (-10 * 8)(4) 136 lfd 24, (-11 * 8)(4) 137 lfd 25, (-12 * 8)(4) 138 lfd 26, (-13 * 8)(4) 139 lfd 27, (-14 * 8)(4) 140 lfd 28, (-15 * 8)(4) 141 lfd 29, (-16 * 8)(4) 142 lfd 30, (-17 * 8)(4) 143 lfd 31, (-18 * 8)(4) 144 145 /* Set condition and link register */ 146 mtcr 5 147 mtlr 0 148 149 /* Return and switch context */ 150 blr 151 .cfi_endproc 152 .size CSYM(fiber_switchContext),.-CSYM(fiber_switchContext) 153 154 #endif /* !defined(__PPC64__) */ 155
Indexes created Thu Apr 09 00:23:28 UTC 2026