[43e0599] | 1 | /** |
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| 2 | * @file |
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| 3 | * |
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| 4 | * @brief SuperH CPU Context |
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| 5 | */ |
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| 6 | |
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[d66a6cb] | 7 | /* |
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| 8 | * Authors: Ralf Corsepius (corsepiu@faw.uni-ulm.de) and |
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| 9 | * Bernd Becker (becker@faw.uni-ulm.de) |
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| 10 | * |
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| 11 | * COPYRIGHT (c) 1997-1998, FAW Ulm, Germany |
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| 12 | * |
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| 13 | * This program is distributed in the hope that it will be useful, |
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| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
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| 16 | * |
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| 17 | * COPYRIGHT (c) 1998. |
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| 18 | * On-Line Applications Research Corporation (OAR). |
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| 19 | * |
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| 20 | * The license and distribution terms for this file may be |
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| 21 | * found in the file LICENSE in this distribution or at |
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[c499856] | 22 | * http://www.rtems.org/license/LICENSE. |
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[d66a6cb] | 23 | */ |
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| 24 | |
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[f086af89] | 25 | #ifdef HAVE_CONFIG_H |
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| 26 | #include "config.h" |
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| 27 | #endif |
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| 28 | |
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[d66a6cb] | 29 | #include <rtems/system.h> |
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| 30 | #include <rtems/score/cpu.h> |
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| 31 | #include <rtems/score/isr.h> |
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| 32 | #include <rtems/score/thread.h> |
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| 33 | #include <rtems/score/sh.h> |
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| 34 | |
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| 35 | /* |
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| 36 | * _CPU_Context_save_fp_context |
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| 37 | * |
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| 38 | * This routine is responsible for saving the FP context |
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| 39 | * at *fp_context_ptr. If the point to load the FP context |
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| 40 | * from is changed then the pointer is modified by this routine. |
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| 41 | * |
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| 42 | * Sometimes a macro implementation of this is in cpu.h which dereferences |
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| 43 | * the ** and a similarly named routine in this file is passed something |
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| 44 | * like a (Context_Control_fp *). The general rule on making this decision |
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| 45 | * is to avoid writing assembly language. |
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| 46 | */ |
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| 47 | |
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| 48 | void _CPU_Context_save_fp( |
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| 49 | Context_Control_fp **fp_context_ptr |
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| 50 | ) |
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| 51 | { |
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| 52 | #if SH_HAS_FPU |
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| 53 | |
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| 54 | asm volatile("\n\ |
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| 55 | mov.l @%0,r4 \n\ |
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| 56 | add %1,r4\n\ |
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| 57 | sts.l fpscr,@-r4\n\ |
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| 58 | sts.l fpul,@-r4\n\ |
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| 59 | lds %2,fpscr\n\ |
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| 60 | fmov dr14,@-r4\n\ |
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| 61 | fmov dr12,@-r4\n\ |
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| 62 | fmov dr10,@-r4\n\ |
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| 63 | fmov dr8,@-r4\n\ |
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| 64 | fmov dr6,@-r4\n\ |
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| 65 | fmov dr4,@-r4\n\ |
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| 66 | fmov dr2,@-r4\n\ |
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| 67 | fmov dr0,@-r4\n\ |
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| 68 | " |
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| 69 | #ifdef SH4_USE_X_REGISTERS |
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| 70 | "\ |
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| 71 | lds %3,fpscr\n\ |
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| 72 | fmov xd14,@-r4\n\ |
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| 73 | fmov xd12,@-r4\n\ |
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| 74 | fmov xd10,@-r4\n\ |
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| 75 | fmov xd8,@-r4\n\ |
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| 76 | fmov xd6,@-r4\n\ |
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| 77 | fmov xd4,@-r4\n\ |
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| 78 | fmov xd2,@-r4\n\ |
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| 79 | fmov xd0,@-r4\n\ |
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| 80 | " |
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| 81 | #endif |
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| 82 | "lds %4,fpscr\n\ |
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| 83 | " |
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| 84 | : |
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| 85 | : "r"(fp_context_ptr), "r"(sizeof(Context_Control_fp)), |
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| 86 | "r"(SH4_FPSCR_SZ), "r"(SH4_FPSCR_PR | SH4_FPSCR_SZ), "r"(SH4_FPSCR_PR) |
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| 87 | : "r4", "r0"); |
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| 88 | |
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| 89 | #endif |
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| 90 | |
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| 91 | } |
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| 92 | |
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| 93 | /* |
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| 94 | * _CPU_Context_restore_fp_context |
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| 95 | * |
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| 96 | * This routine is responsible for restoring the FP context |
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| 97 | * at *fp_context_ptr. If the point to load the FP context |
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| 98 | * from is changed then the pointer is modified by this routine. |
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| 99 | * |
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| 100 | * Sometimes a macro implementation of this is in cpu.h which dereferences |
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| 101 | * the ** and a similarly named routine in this file is passed something |
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| 102 | * like a (Context_Control_fp *). The general rule on making this decision |
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| 103 | * is to avoid writing assembly language. |
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| 104 | */ |
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| 105 | |
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| 106 | void _CPU_Context_restore_fp( |
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| 107 | Context_Control_fp **fp_context_ptr |
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| 108 | ) |
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| 109 | { |
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| 110 | |
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| 111 | #if SH_HAS_FPU |
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| 112 | |
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| 113 | asm volatile("\n\ |
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| 114 | mov.l @%0,r4 \n\ |
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| 115 | " |
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| 116 | #ifdef SH4_USE_X_REGISTERS |
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| 117 | "\n\ |
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| 118 | lds %1,fpscr\n\ |
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| 119 | fmov @r4+,xd0\n\ |
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| 120 | fmov @r4+,xd2\n\ |
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| 121 | fmov @r4+,xd4\n\ |
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| 122 | fmov @r4+,xd6\n\ |
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| 123 | fmov @r4+,xd8\n\ |
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| 124 | fmov @r4+,xd10\n\ |
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| 125 | fmov @r4+,xd12\n\ |
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| 126 | fmov @r4+,xd14\n\ |
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| 127 | " |
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| 128 | #endif |
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| 129 | "\n\ |
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| 130 | lds %2,fpscr\n\ |
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| 131 | fmov @r4+,dr0\n\ |
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| 132 | fmov @r4+,dr2\n\ |
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| 133 | fmov @r4+,dr4\n\ |
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| 134 | fmov @r4+,dr6\n\ |
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| 135 | fmov @r4+,dr8\n\ |
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| 136 | fmov @r4+,dr10\n\ |
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| 137 | fmov @r4+,dr12\n\ |
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| 138 | fmov @r4+,dr14\n\ |
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| 139 | lds.l @r4+,fpul\n\ |
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| 140 | lds.l @r4+,fpscr\n\ |
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| 141 | " : |
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| 142 | : "r"(fp_context_ptr), "r"(SH4_FPSCR_PR | SH4_FPSCR_SZ), "r"(SH4_FPSCR_SZ) |
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| 143 | : "r4", "r0"); |
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| 144 | #endif |
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| 145 | } |
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| 146 | |
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| 147 | /* _CPU_Context_switch |
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| 148 | * |
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| 149 | * This routine performs a normal non-FP context switch. |
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| 150 | */ |
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| 151 | |
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| 152 | /* within __CPU_Context_switch: |
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| 153 | * _CPU_Context_switch |
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| 154 | * _CPU_Context_restore |
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| 155 | * |
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| 156 | * This routine is generally used only to restart self in an |
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| 157 | * efficient manner. It may simply be a label in _CPU_Context_switch. |
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| 158 | * |
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| 159 | * NOTE: It should be safe not to store r4, r5 |
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| 160 | * |
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| 161 | * NOTE: It is doubtful if r0 is really needed to be stored |
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| 162 | * |
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| 163 | * NOTE: gbr is added, but should not be necessary, as it is |
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| 164 | * only used globally in this port. |
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| 165 | */ |
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| 166 | |
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| 167 | /* |
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| 168 | * FIXME: This is an ugly hack, but we wanted to avoid recalculating |
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| 169 | * the offset each time Context_Control is changed |
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| 170 | */ |
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[4f4e7bb6] | 171 | void _CPU_Context_switch( |
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[d66a6cb] | 172 | Context_Control *run, /* r4 */ |
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| 173 | Context_Control *heir /* r5 */ |
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| 174 | ) |
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| 175 | { |
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| 176 | |
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| 177 | asm volatile("\n\ |
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| 178 | .global __CPU_Context_switch\n\ |
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| 179 | __CPU_Context_switch:\n\ |
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| 180 | \n\ |
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| 181 | add %0,r4\n\ |
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| 182 | \n\ |
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| 183 | stc.l sr,@-r4\n\ |
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| 184 | stc.l gbr,@-r4\n\ |
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| 185 | mov.l r0,@-r4\n\ |
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| 186 | mov.l r1,@-r4\n\ |
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| 187 | mov.l r2,@-r4\n\ |
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| 188 | mov.l r3,@-r4\n\ |
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| 189 | \n\ |
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| 190 | mov.l r6,@-r4\n\ |
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| 191 | mov.l r7,@-r4\n\ |
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| 192 | mov.l r8,@-r4\n\ |
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| 193 | mov.l r9,@-r4\n\ |
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| 194 | mov.l r10,@-r4\n\ |
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| 195 | mov.l r11,@-r4\n\ |
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| 196 | mov.l r12,@-r4\n\ |
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| 197 | mov.l r13,@-r4\n\ |
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| 198 | mov.l r14,@-r4\n\ |
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| 199 | sts.l pr,@-r4\n\ |
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| 200 | sts.l mach,@-r4\n\ |
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| 201 | sts.l macl,@-r4\n\ |
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| 202 | mov.l r15,@-r4\n\ |
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| 203 | \n\ |
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| 204 | mov r5, r4" |
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| 205 | :: "i" (sizeof(Context_Control)) |
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| 206 | ); |
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| 207 | |
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[05d72d5] | 208 | __asm__ volatile("\n\ |
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[d66a6cb] | 209 | .global __CPU_Context_restore\n\ |
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| 210 | __CPU_Context_restore:\n\ |
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| 211 | mov.l @r4+,r15\n\ |
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| 212 | lds.l @r4+,macl\n\ |
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| 213 | lds.l @r4+,mach\n\ |
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| 214 | lds.l @r4+,pr\n\ |
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| 215 | mov.l @r4+,r14\n\ |
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| 216 | mov.l @r4+,r13\n\ |
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| 217 | mov.l @r4+,r12\n\ |
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| 218 | mov.l @r4+,r11\n\ |
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| 219 | mov.l @r4+,r10\n\ |
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| 220 | mov.l @r4+,r9\n\ |
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| 221 | mov.l @r4+,r8\n\ |
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| 222 | mov.l @r4+,r7\n\ |
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| 223 | mov.l @r4+,r6\n\ |
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| 224 | \n\ |
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| 225 | mov.l @r4+,r3\n\ |
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| 226 | mov.l @r4+,r2\n\ |
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| 227 | mov.l @r4+,r1\n\ |
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| 228 | mov.l @r4+,r0\n\ |
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| 229 | ldc.l @r4+,gbr\n\ |
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| 230 | ldc.l @r4+,sr\n\ |
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| 231 | \n\ |
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| 232 | rts\n\ |
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| 233 | nop" ); |
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| 234 | } |
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