| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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: |
| 11 | * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com) |
| 12 | */ |
| 13 | #include <asm/asm.h> |
| 14 | #include <asm/fpregdef.h> |
| 15 | #include <asm/mipsregs.h> |
| 16 | #include <asm/offset.h> |
| 17 | #include <asm/regdef.h> |
| 18 | |
| 19 | .set noreorder |
| 20 | .set mips2 |
| 21 | /* Save floating point context */ |
| 22 | LEAF(_save_fp_context) |
| 23 | mfc0 t0,CP0_STATUS |
| 24 | sll t0,t0,2 |
| 25 | bgez t0,1f |
| 26 | nop |
| 27 | |
| 28 | cfc1 t1,fcr31 |
| 29 | /* Store the 16 double precision registers */ |
| 30 | sdc1 $f0,(SC_FPREGS+0)(a0) |
| 31 | sdc1 $f2,(SC_FPREGS+16)(a0) |
| 32 | sdc1 $f4,(SC_FPREGS+32)(a0) |
| 33 | sdc1 $f6,(SC_FPREGS+48)(a0) |
| 34 | sdc1 $f8,(SC_FPREGS+64)(a0) |
| 35 | sdc1 $f10,(SC_FPREGS+80)(a0) |
| 36 | sdc1 $f12,(SC_FPREGS+96)(a0) |
| 37 | sdc1 $f14,(SC_FPREGS+112)(a0) |
| 38 | sdc1 $f16,(SC_FPREGS+128)(a0) |
| 39 | sdc1 $f18,(SC_FPREGS+144)(a0) |
| 40 | sdc1 $f20,(SC_FPREGS+160)(a0) |
| 41 | sdc1 $f22,(SC_FPREGS+176)(a0) |
| 42 | sdc1 $f24,(SC_FPREGS+192)(a0) |
| 43 | sdc1 $f26,(SC_FPREGS+208)(a0) |
| 44 | sdc1 $f28,(SC_FPREGS+224)(a0) |
| 45 | sdc1 $f30,(SC_FPREGS+240)(a0) |
| 46 | jr ra |
| 47 | sw t0,SC_FPC_CSR(a0) |
| 48 | 1: jr ra |
| 49 | nop |
| 50 | END(_save_fp_context) |
| 51 | |
| 52 | /* Restore FPU state: |
| 53 | * - fp gp registers |
| 54 | * - cp1 status/control register |
| 55 | * |
| 56 | * We base the decision which registers to restore from the signal stack |
| 57 | * frame on the current content of c0_status, not on the content of the |
| 58 | * stack frame which might have been changed by the user. |
| 59 | */ |
| 60 | LEAF(_restore_fp_context) |
| 61 | mfc0 t0,CP0_STATUS |
| 62 | sll t0,t0,2 |
| 63 | |
| 64 | bgez t0,1f |
| 65 | lw t0,SC_FPC_CSR(a0) |
| 66 | /* Restore the 16 double precision registers */ |
| 67 | ldc1 $f0,(SC_FPREGS+0)(a0) |
| 68 | ldc1 $f2,(SC_FPREGS+16)(a0) |
| 69 | ldc1 $f4,(SC_FPREGS+32)(a0) |
| 70 | ldc1 $f6,(SC_FPREGS+48)(a0) |
| 71 | ldc1 $f8,(SC_FPREGS+64)(a0) |
| 72 | ldc1 $f10,(SC_FPREGS+80)(a0) |
| 73 | ldc1 $f12,(SC_FPREGS+96)(a0) |
| 74 | ldc1 $f14,(SC_FPREGS+112)(a0) |
| 75 | ldc1 $f16,(SC_FPREGS+128)(a0) |
| 76 | ldc1 $f18,(SC_FPREGS+144)(a0) |
| 77 | ldc1 $f20,(SC_FPREGS+160)(a0) |
| 78 | ldc1 $f22,(SC_FPREGS+176)(a0) |
| 79 | ldc1 $f24,(SC_FPREGS+192)(a0) |
| 80 | ldc1 $f26,(SC_FPREGS+208)(a0) |
| 81 | ldc1 $f28,(SC_FPREGS+224)(a0) |
| 82 | ldc1 $f30,(SC_FPREGS+240)(a0) |
| 83 | jr ra |
| 84 | ctc1 t0,fcr31 |
| 85 | 1: jr ra |
| 86 | nop |
| 87 | END(_restore_fp_context) |