projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * r6000_fpu.S: Save/restore floating point context for signal handlers. | |
| 3 | * | |
| 4 | * This file is subject to the terms and conditions of the GNU General Public | |
| 5 | * License. See the file "COPYING" in the main directory of this archive | |
| 6 | * for more details. | |
| 7 | * | |
| 8 | * Copyright (C) 1996 by Ralf Baechle | |
| 9 | * | |
| 10 | * Multi-arch abstraction and asm macros for easier reading: | |
| 79add627 | 11 | * Copyright (C) 1996 David S. Miller (davem@davemloft.net) |
| 1da177e4 LT |
12 | */ |
| 13 | #include <asm/asm.h> | |
| 14 | #include <asm/fpregdef.h> | |
| 15 | #include <asm/mipsregs.h> | |
| 048eb582 | 16 | #include <asm/asm-offsets.h> |
| 1da177e4 LT |
17 | #include <asm/regdef.h> |
| 18 | ||
| 19 | .set noreorder | |
| 20 | .set mips2 | |
| 842dfc11 ML |
21 | .set push |
| 22 | SET_HARDFLOAT | |
| 23 | ||
| 1da177e4 LT |
24 | /* Save floating point context */ |
| 25 | LEAF(_save_fp_context) | |
| 26 | mfc0 t0,CP0_STATUS | |
| 27 | sll t0,t0,2 | |
| 28 | bgez t0,1f | |
| 29 | nop | |
| 30 | ||
| 31 | cfc1 t1,fcr31 | |
| 32 | /* Store the 16 double precision registers */ | |
| 33 | sdc1 $f0,(SC_FPREGS+0)(a0) | |
| 34 | sdc1 $f2,(SC_FPREGS+16)(a0) | |
| 35 | sdc1 $f4,(SC_FPREGS+32)(a0) | |
| 36 | sdc1 $f6,(SC_FPREGS+48)(a0) | |
| 37 | sdc1 $f8,(SC_FPREGS+64)(a0) | |
| 38 | sdc1 $f10,(SC_FPREGS+80)(a0) | |
| 39 | sdc1 $f12,(SC_FPREGS+96)(a0) | |
| 40 | sdc1 $f14,(SC_FPREGS+112)(a0) | |
| 41 | sdc1 $f16,(SC_FPREGS+128)(a0) | |
| 42 | sdc1 $f18,(SC_FPREGS+144)(a0) | |
| 43 | sdc1 $f20,(SC_FPREGS+160)(a0) | |
| 44 | sdc1 $f22,(SC_FPREGS+176)(a0) | |
| 45 | sdc1 $f24,(SC_FPREGS+192)(a0) | |
| 46 | sdc1 $f26,(SC_FPREGS+208)(a0) | |
| 47 | sdc1 $f28,(SC_FPREGS+224)(a0) | |
| 48 | sdc1 $f30,(SC_FPREGS+240)(a0) | |
| 49 | jr ra | |
| 50 | sw t0,SC_FPC_CSR(a0) | |
| 51 | 1: jr ra | |
| 52 | nop | |
| 53 | END(_save_fp_context) | |
| 54 | ||
| 55 | /* Restore FPU state: | |
| 56 | * - fp gp registers | |
| 57 | * - cp1 status/control register | |
| 58 | * | |
| 59 | * We base the decision which registers to restore from the signal stack | |
| 60 | * frame on the current content of c0_status, not on the content of the | |
| 61 | * stack frame which might have been changed by the user. | |
| 62 | */ | |
| 63 | LEAF(_restore_fp_context) | |
| 64 | mfc0 t0,CP0_STATUS | |
| 65 | sll t0,t0,2 | |
| 66 | ||
| 67 | bgez t0,1f | |
| 68 | lw t0,SC_FPC_CSR(a0) | |
| 69 | /* Restore the 16 double precision registers */ | |
| 70 | ldc1 $f0,(SC_FPREGS+0)(a0) | |
| 71 | ldc1 $f2,(SC_FPREGS+16)(a0) | |
| 72 | ldc1 $f4,(SC_FPREGS+32)(a0) | |
| 73 | ldc1 $f6,(SC_FPREGS+48)(a0) | |
| 74 | ldc1 $f8,(SC_FPREGS+64)(a0) | |
| 75 | ldc1 $f10,(SC_FPREGS+80)(a0) | |
| 76 | ldc1 $f12,(SC_FPREGS+96)(a0) | |
| 77 | ldc1 $f14,(SC_FPREGS+112)(a0) | |
| 78 | ldc1 $f16,(SC_FPREGS+128)(a0) | |
| 79 | ldc1 $f18,(SC_FPREGS+144)(a0) | |
| 80 | ldc1 $f20,(SC_FPREGS+160)(a0) | |
| 81 | ldc1 $f22,(SC_FPREGS+176)(a0) | |
| 82 | ldc1 $f24,(SC_FPREGS+192)(a0) | |
| 83 | ldc1 $f26,(SC_FPREGS+208)(a0) | |
| 84 | ldc1 $f28,(SC_FPREGS+224)(a0) | |
| 85 | ldc1 $f30,(SC_FPREGS+240)(a0) | |
| 86 | jr ra | |
| 87 | ctc1 t0,fcr31 | |
| 88 | 1: jr ra | |
| 89 | nop | |
| 90 | END(_restore_fp_context) | |
| 842dfc11 ML |
91 | |
| 92 | .set pop /* SET_HARDFLOAT */ |