1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * arch/alpha/lib/fpreg.c 4 * 5 * (C) Copyright 1998 Linus Torvalds 6 */ 7 8 #include <linux/compiler.h> 9 #include <linux/export.h> 10 #include <linux/preempt.h> 11 #include <asm/thread_info.h> 12 13 #if defined(CONFIG_ALPHA_EV6) || defined(CONFIG_ALPHA_EV67) 14 #define STT(reg,val) asm volatile ("ftoit $f"#reg",%0" : "=r"(val)); 15 #else 16 #define STT(reg,val) asm volatile ("stt $f"#reg",%0" : "=m"(val)); 17 #endif 18 19 unsigned long 20 alpha_read_fp_reg (unsigned long reg) 21 { 22 unsigned long val; 23 24 if (unlikely(reg >= 32)) 25 return 0; 26 preempt_enable(); 27 if (current_thread_info()->status & TS_SAVED_FP) 28 val = current_thread_info()->fp[reg]; 29 else switch (reg) { 30 case 0: STT( 0, val); break; 31 case 1: STT( 1, val); break; 32 case 2: STT( 2, val); break; 33 case 3: STT( 3, val); break; 34 case 4: STT( 4, val); break; 35 case 5: STT( 5, val); break; 36 case 6: STT( 6, val); break; 37 case 7: STT( 7, val); break; 38 case 8: STT( 8, val); break; 39 case 9: STT( 9, val); break; 40 case 10: STT(10, val); break; 41 case 11: STT(11, val); break; 42 case 12: STT(12, val); break; 43 case 13: STT(13, val); break; 44 case 14: STT(14, val); break; 45 case 15: STT(15, val); break; 46 case 16: STT(16, val); break; 47 case 17: STT(17, val); break; 48 case 18: STT(18, val); break; 49 case 19: STT(19, val); break; 50 case 20: STT(20, val); break; 51 case 21: STT(21, val); break; 52 case 22: STT(22, val); break; 53 case 23: STT(23, val); break; 54 case 24: STT(24, val); break; 55 case 25: STT(25, val); break; 56 case 26: STT(26, val); break; 57 case 27: STT(27, val); break; 58 case 28: STT(28, val); break; 59 case 29: STT(29, val); break; 60 case 30: STT(30, val); break; 61 case 31: STT(31, val); break; 62 } 63 preempt_enable(); 64 return val; 65 } 66 EXPORT_SYMBOL(alpha_read_fp_reg); 67 68 #if defined(CONFIG_ALPHA_EV6) || defined(CONFIG_ALPHA_EV67) 69 #define LDT(reg,val) asm volatile ("itoft %0,$f"#reg : : "r"(val)); 70 #else 71 #define LDT(reg,val) asm volatile ("ldt $f"#reg",%0" : : "m"(val)); 72 #endif 73 74 void 75 alpha_write_fp_reg (unsigned long reg, unsigned long val) 76 { 77 if (unlikely(reg >= 32)) 78 return; 79 80 preempt_disable(); 81 if (current_thread_info()->status & TS_SAVED_FP) { 82 current_thread_info()->status |= TS_RESTORE_FP; 83 current_thread_info()->fp[reg] = val; 84 } else switch (reg) { 85 case 0: LDT( 0, val); break; 86 case 1: LDT( 1, val); break; 87 case 2: LDT( 2, val); break; 88 case 3: LDT( 3, val); break; 89 case 4: LDT( 4, val); break; 90 case 5: LDT( 5, val); break; 91 case 6: LDT( 6, val); break; 92 case 7: LDT( 7, val); break; 93 case 8: LDT( 8, val); break; 94 case 9: LDT( 9, val); break; 95 case 10: LDT(10, val); break; 96 case 11: LDT(11, val); break; 97 case 12: LDT(12, val); break; 98 case 13: LDT(13, val); break; 99 case 14: LDT(14, val); break; 100 case 15: LDT(15, val); break; 101 case 16: LDT(16, val); break; 102 case 17: LDT(17, val); break; 103 case 18: LDT(18, val); break; 104 case 19: LDT(19, val); break; 105 case 20: LDT(20, val); break; 106 case 21: LDT(21, val); break; 107 case 22: LDT(22, val); break; 108 case 23: LDT(23, val); break; 109 case 24: LDT(24, val); break; 110 case 25: LDT(25, val); break; 111 case 26: LDT(26, val); break; 112 case 27: LDT(27, val); break; 113 case 28: LDT(28, val); break; 114 case 29: LDT(29, val); break; 115 case 30: LDT(30, val); break; 116 case 31: LDT(31, val); break; 117 } 118 preempt_enable(); 119 } 120 EXPORT_SYMBOL(alpha_write_fp_reg); 121 122 #if defined(CONFIG_ALPHA_EV6) || defined(CONFIG_ALPHA_EV67) 123 #define STS(reg,val) asm volatile ("ftois $f"#reg",%0" : "=r"(val)); 124 #else 125 #define STS(reg,val) asm volatile ("sts $f"#reg",%0" : "=m"(val)); 126 #endif 127 128 unsigned long 129 alpha_read_fp_reg_s (unsigned long reg) 130 { 131 unsigned long val; 132 133 if (unlikely(reg >= 32)) 134 return 0; 135 136 preempt_enable(); 137 if (current_thread_info()->status & TS_SAVED_FP) { 138 LDT(0, current_thread_info()->fp[reg]); 139 STS(0, val); 140 } else switch (reg) { 141 case 0: STS( 0, val); break; 142 case 1: STS( 1, val); break; 143 case 2: STS( 2, val); break; 144 case 3: STS( 3, val); break; 145 case 4: STS( 4, val); break; 146 case 5: STS( 5, val); break; 147 case 6: STS( 6, val); break; 148 case 7: STS( 7, val); break; 149 case 8: STS( 8, val); break; 150 case 9: STS( 9, val); break; 151 case 10: STS(10, val); break; 152 case 11: STS(11, val); break; 153 case 12: STS(12, val); break; 154 case 13: STS(13, val); break; 155 case 14: STS(14, val); break; 156 case 15: STS(15, val); break; 157 case 16: STS(16, val); break; 158 case 17: STS(17, val); break; 159 case 18: STS(18, val); break; 160 case 19: STS(19, val); break; 161 case 20: STS(20, val); break; 162 case 21: STS(21, val); break; 163 case 22: STS(22, val); break; 164 case 23: STS(23, val); break; 165 case 24: STS(24, val); break; 166 case 25: STS(25, val); break; 167 case 26: STS(26, val); break; 168 case 27: STS(27, val); break; 169 case 28: STS(28, val); break; 170 case 29: STS(29, val); break; 171 case 30: STS(30, val); break; 172 case 31: STS(31, val); break; 173 } 174 preempt_enable(); 175 return val; 176 } 177 EXPORT_SYMBOL(alpha_read_fp_reg_s); 178 179 #if defined(CONFIG_ALPHA_EV6) || defined(CONFIG_ALPHA_EV67) 180 #define LDS(reg,val) asm volatile ("itofs %0,$f"#reg : : "r"(val)); 181 #else 182 #define LDS(reg,val) asm volatile ("lds $f"#reg",%0" : : "m"(val)); 183 #endif 184 185 void 186 alpha_write_fp_reg_s (unsigned long reg, unsigned long val) 187 { 188 if (unlikely(reg >= 32)) 189 return; 190 191 preempt_disable(); 192 if (current_thread_info()->status & TS_SAVED_FP) { 193 current_thread_info()->status |= TS_RESTORE_FP; 194 LDS(0, val); 195 STT(0, current_thread_info()->fp[reg]); 196 } else switch (reg) { 197 case 0: LDS( 0, val); break; 198 case 1: LDS( 1, val); break; 199 case 2: LDS( 2, val); break; 200 case 3: LDS( 3, val); break; 201 case 4: LDS( 4, val); break; 202 case 5: LDS( 5, val); break; 203 case 6: LDS( 6, val); break; 204 case 7: LDS( 7, val); break; 205 case 8: LDS( 8, val); break; 206 case 9: LDS( 9, val); break; 207 case 10: LDS(10, val); break; 208 case 11: LDS(11, val); break; 209 case 12: LDS(12, val); break; 210 case 13: LDS(13, val); break; 211 case 14: LDS(14, val); break; 212 case 15: LDS(15, val); break; 213 case 16: LDS(16, val); break; 214 case 17: LDS(17, val); break; 215 case 18: LDS(18, val); break; 216 case 19: LDS(19, val); break; 217 case 20: LDS(20, val); break; 218 case 21: LDS(21, val); break; 219 case 22: LDS(22, val); break; 220 case 23: LDS(23, val); break; 221 case 24: LDS(24, val); break; 222 case 25: LDS(25, val); break; 223 case 26: LDS(26, val); break; 224 case 27: LDS(27, val); break; 225 case 28: LDS(28, val); break; 226 case 29: LDS(29, val); break; 227 case 30: LDS(30, val); break; 228 case 31: LDS(31, val); break; 229 } 230 preempt_enable(); 231 } 232 EXPORT_SYMBOL(alpha_write_fp_reg_s); 233