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