Merge remote-tracking branch 'remotes/vivier2/tags/linux-user-for-6.2-pull-request...
[qemu.git] / target / ppc / cpu.c
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(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 }