| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 1 | /* |
| 2 | * This file is subject to the terms and conditions of the GNU General Public |
| 3 | * License. See the file "COPYING" in the main directory of this archive |
| 4 | * for more details. |
| 5 | * |
| 6 | * FPU context handling code for KVM. |
| 7 | * |
| 8 | * Copyright (C) 2015 Imagination Technologies Ltd. |
| 9 | */ |
| 10 | |
| 11 | #include <asm/asm.h> |
| 12 | #include <asm/asm-offsets.h> |
| 13 | #include <asm/fpregdef.h> |
| 14 | #include <asm/mipsregs.h> |
| 15 | #include <asm/regdef.h> |
| 16 | |
| 17 | /* preprocessor replaces the fp in ".set fp=64" with $30 otherwise */ |
| 18 | #undef fp |
| 19 | |
| 20 | .set noreorder |
| 21 | .set noat |
| 22 | |
| 23 | LEAF(__kvm_save_fpu) |
| 24 | .set push |
| 25 | SET_HARDFLOAT |
| 26 | .set fp=64 |
| 27 | mfc0 t0, CP0_STATUS |
| 28 | sll t0, t0, 5 # is Status.FR set? |
| 29 | bgez t0, 1f # no: skip odd doubles |
| 30 | nop |
| 31 | sdc1 $f1, VCPU_FPR1(a0) |
| 32 | sdc1 $f3, VCPU_FPR3(a0) |
| 33 | sdc1 $f5, VCPU_FPR5(a0) |
| 34 | sdc1 $f7, VCPU_FPR7(a0) |
| 35 | sdc1 $f9, VCPU_FPR9(a0) |
| 36 | sdc1 $f11, VCPU_FPR11(a0) |
| 37 | sdc1 $f13, VCPU_FPR13(a0) |
| 38 | sdc1 $f15, VCPU_FPR15(a0) |
| 39 | sdc1 $f17, VCPU_FPR17(a0) |
| 40 | sdc1 $f19, VCPU_FPR19(a0) |
| 41 | sdc1 $f21, VCPU_FPR21(a0) |
| 42 | sdc1 $f23, VCPU_FPR23(a0) |
| 43 | sdc1 $f25, VCPU_FPR25(a0) |
| 44 | sdc1 $f27, VCPU_FPR27(a0) |
| 45 | sdc1 $f29, VCPU_FPR29(a0) |
| 46 | sdc1 $f31, VCPU_FPR31(a0) |
| 47 | 1: sdc1 $f0, VCPU_FPR0(a0) |
| 48 | sdc1 $f2, VCPU_FPR2(a0) |
| 49 | sdc1 $f4, VCPU_FPR4(a0) |
| 50 | sdc1 $f6, VCPU_FPR6(a0) |
| 51 | sdc1 $f8, VCPU_FPR8(a0) |
| 52 | sdc1 $f10, VCPU_FPR10(a0) |
| 53 | sdc1 $f12, VCPU_FPR12(a0) |
| 54 | sdc1 $f14, VCPU_FPR14(a0) |
| 55 | sdc1 $f16, VCPU_FPR16(a0) |
| 56 | sdc1 $f18, VCPU_FPR18(a0) |
| 57 | sdc1 $f20, VCPU_FPR20(a0) |
| 58 | sdc1 $f22, VCPU_FPR22(a0) |
| 59 | sdc1 $f24, VCPU_FPR24(a0) |
| 60 | sdc1 $f26, VCPU_FPR26(a0) |
| 61 | sdc1 $f28, VCPU_FPR28(a0) |
| 62 | jr ra |
| 63 | sdc1 $f30, VCPU_FPR30(a0) |
| 64 | .set pop |
| 65 | END(__kvm_save_fpu) |
| 66 | |
| 67 | LEAF(__kvm_restore_fpu) |
| 68 | .set push |
| 69 | SET_HARDFLOAT |
| 70 | .set fp=64 |
| 71 | mfc0 t0, CP0_STATUS |
| 72 | sll t0, t0, 5 # is Status.FR set? |
| 73 | bgez t0, 1f # no: skip odd doubles |
| 74 | nop |
| 75 | ldc1 $f1, VCPU_FPR1(a0) |
| 76 | ldc1 $f3, VCPU_FPR3(a0) |
| 77 | ldc1 $f5, VCPU_FPR5(a0) |
| 78 | ldc1 $f7, VCPU_FPR7(a0) |
| 79 | ldc1 $f9, VCPU_FPR9(a0) |
| 80 | ldc1 $f11, VCPU_FPR11(a0) |
| 81 | ldc1 $f13, VCPU_FPR13(a0) |
| 82 | ldc1 $f15, VCPU_FPR15(a0) |
| 83 | ldc1 $f17, VCPU_FPR17(a0) |
| 84 | ldc1 $f19, VCPU_FPR19(a0) |
| 85 | ldc1 $f21, VCPU_FPR21(a0) |
| 86 | ldc1 $f23, VCPU_FPR23(a0) |
| 87 | ldc1 $f25, VCPU_FPR25(a0) |
| 88 | ldc1 $f27, VCPU_FPR27(a0) |
| 89 | ldc1 $f29, VCPU_FPR29(a0) |
| 90 | ldc1 $f31, VCPU_FPR31(a0) |
| 91 | 1: ldc1 $f0, VCPU_FPR0(a0) |
| 92 | ldc1 $f2, VCPU_FPR2(a0) |
| 93 | ldc1 $f4, VCPU_FPR4(a0) |
| 94 | ldc1 $f6, VCPU_FPR6(a0) |
| 95 | ldc1 $f8, VCPU_FPR8(a0) |
| 96 | ldc1 $f10, VCPU_FPR10(a0) |
| 97 | ldc1 $f12, VCPU_FPR12(a0) |
| 98 | ldc1 $f14, VCPU_FPR14(a0) |
| 99 | ldc1 $f16, VCPU_FPR16(a0) |
| 100 | ldc1 $f18, VCPU_FPR18(a0) |
| 101 | ldc1 $f20, VCPU_FPR20(a0) |
| 102 | ldc1 $f22, VCPU_FPR22(a0) |
| 103 | ldc1 $f24, VCPU_FPR24(a0) |
| 104 | ldc1 $f26, VCPU_FPR26(a0) |
| 105 | ldc1 $f28, VCPU_FPR28(a0) |
| 106 | jr ra |
| 107 | ldc1 $f30, VCPU_FPR30(a0) |
| 108 | .set pop |
| 109 | END(__kvm_restore_fpu) |
| 110 | |
| 111 | LEAF(__kvm_restore_fcsr) |
| 112 | .set push |
| 113 | SET_HARDFLOAT |
| 114 | lw t0, VCPU_FCR31(a0) |
| 115 | /* |
| 116 | * The ctc1 must stay at this offset in __kvm_restore_fcsr. |
| 117 | * See kvm_mips_csr_die_notify() which handles t0 containing a value |
| 118 | * which triggers an FP Exception, which must be stepped over and |
| 119 | * ignored since the set cause bits must remain there for the guest. |
| 120 | */ |
| 121 | ctc1 t0, fcr31 |
| 122 | jr ra |
| 123 | nop |
| 124 | .set pop |
| 125 | END(__kvm_restore_fcsr) |