1 /* 2 * PowerPC CPU routines for qemu. 3 * 4 * Copyright (c) 2017 Nikunj A Dadhania, IBM Corporation. 5 * 6 * This library is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * This library is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with this library; if not, see <http://www.gnu.org/licenses/>. 18 */ 19 20 #include "qemu/osdep.h" 21 #include "cpu.h" 22 #include "cpu-models.h" 23 #include "cpu-qom.h" 24 #include "exec/log.h" 25 #include "fpu/softfloat-helpers.h" 26 #include "mmu-hash64.h" 27 #include "helper_regs.h" 28 #include "sysemu/tcg.h" 29 30 target_ulong cpu_read_xer(const CPUPPCState *env) 31 { 32 if (is_isa300(env)) { 33 return env->xer | (env->so << XER_SO) | 34 (env->ov << XER_OV) | (env->ca << XER_CA) | 35 (env->ov32 << XER_OV32) | (env->ca32 << XER_CA32); 36 } 37 38 return env->xer | (env->so << XER_SO) | (env->ov << XER_OV) | 39 (env->ca << XER_CA); 40 } 41 42 void cpu_write_xer(CPUPPCState *env, target_ulong xer) 43 { 44 env->so = (xer >> XER_SO) & 1; 45 env->ov = (xer >> XER_OV) & 1; 46 env->ca = (xer >> XER_CA) & 1; 47 /* write all the flags, while reading back check of isa300 */ 48 env->ov32 = (xer >> XER_OV32) & 1; 49 env->ca32 = (xer >> XER_CA32) & 1; 50 env->xer = xer & ~((1ul << XER_SO) | 51 (1ul << XER_OV) | (1ul << XER_CA) | 52 (1ul << XER_OV32) | (1ul << XER_CA32)); 53 } 54 55 void ppc_store_vscr(CPUPPCState *env, uint32_t vscr) 56 { 57 env->vscr = vscr & ~(1u << VSCR_SAT); 58 /* Which bit we set is completely arbitrary, but clear the rest. */ 59 env->vscr_sat.u64[0] = vscr & (1u << VSCR_SAT); 60 env->vscr_sat.u64[1] = 0; 61 set_flush_to_zero((vscr >> VSCR_NJ) & 1, &env->vec_status); 62 } 63 64 uint32_t ppc_get_vscr(CPUPPCState *env) 65 { 66 uint32_t sat = (env->vscr_sat.u64[0] | env->vscr_sat.u64[1]) != 0; 67 return env->vscr | (sat << VSCR_SAT); 68 } 69 70 /* GDBstub can read and write MSR... */ 71 void ppc_store_msr(CPUPPCState *env, target_ulong value) 72 { 73 hreg_store_msr(env, value, 0); 74 } 75 76 void ppc_store_lpcr(PowerPCCPU *cpu, target_ulong val) 77 { 78 PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu); 79 CPUPPCState *env = &cpu->env; 80 81 env->spr[SPR_LPCR] = val & pcc->lpcr_mask; 82 /* The gtse bit affects hflags */ 83 hreg_compute_hflags(env); 84 } 85 86 static inline void fpscr_set_rounding_mode(CPUPPCState *env) 87 { 88 int rnd_type; 89 90 /* Set rounding mode */ 91 switch (fpscr_rn) { 92 case 0: 93 /* Best approximation (round to nearest) */ 94 rnd_type = float_round_nearest_even; 95 break; 96 case 1: 97 /* Smaller magnitude (round toward zero) */ 98 rnd_type = float_round_to_zero; 99 break; 100 case 2: 101 /* Round toward +infinite */ 102 rnd_type = float_round_up; 103 break; 104 default: 105 case 3: 106 /* Round toward -infinite */ 107 rnd_type = float_round_down; 108 break; 109 } 110 set_float_rounding_mode(rnd_type, &env->fp_status); 111 } 112 113 void ppc_store_fpscr(CPUPPCState *env, target_ulong val) 114 { 115 val &= ~(FP_VX | FP_FEX); 116 if (val & FPSCR_IX) { 117 val |= FP_VX; 118 } 119 if ((val >> FPSCR_XX) & (val >> FPSCR_XE) & 0x1f) { 120 val |= FP_FEX; 121 } 122 env->fpscr = val; 123 if (tcg_enabled()) { 124 fpscr_set_rounding_mode(env); 125 } 126 } 127