/* * r6000_fpu.S: Save/restore floating point context for signal handlers. * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 1996 by Ralf Baechle * * Multi-arch abstraction and asm macros for easier reading: * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com) */ #include <asm/asm.h> #include <asm/fpregdef.h> #include <asm/mipsregs.h> #include <asm/asm-offsets.h> #include <asm/regdef.h> .set noreorder .set mips2 /* Save floating point context */ LEAF(_save_fp_context) mfc0 t0,CP0_STATUS sll t0,t0,2 bgez t0,1f nop cfc1 t1,fcr31 /* Store the 16 double precision registers */ sdc1 $f0,(SC_FPREGS+0)(a0) sdc1 $f2,(SC_FPREGS+16)(a0) sdc1 $f4,(SC_FPREGS+32)(a0) sdc1 $f6,(SC_FPREGS+48)(a0) sdc1 $f8,(SC_FPREGS+64)(a0) sdc1 $f10,(SC_FPREGS+80)(a0) sdc1 $f12,(SC_FPREGS+96)(a0) sdc1 $f14,(SC_FPREGS+112)(a0) sdc1 $f16,(SC_FPREGS+128)(a0) sdc1 $f18,(SC_FPREGS+144)(a0) sdc1 $f20,(SC_FPREGS+160)(a0) sdc1 $f22,(SC_FPREGS+176)(a0) sdc1 $f24,(SC_FPREGS+192)(a0) sdc1 $f26,(SC_FPREGS+208)(a0) sdc1 $f28,(SC_FPREGS+224)(a0) sdc1 $f30,(SC_FPREGS+240)(a0) jr ra sw t0,SC_FPC_CSR(a0) 1: jr ra nop END(_save_fp_context) /* Restore FPU state: * - fp gp registers * - cp1 status/control register * * We base the decision which registers to restore from the signal stack * frame on the current content of c0_status, not on the content of the * stack frame which might have been changed by the user. */ LEAF(_restore_fp_context) mfc0 t0,CP0_STATUS sll t0,t0,2 bgez t0,1f lw t0,SC_FPC_CSR(a0) /* Restore the 16 double precision registers */ ldc1 $f0,(SC_FPREGS+0)(a0) ldc1 $f2,(SC_FPREGS+16)(a0) ldc1 $f4,(SC_FPREGS+32)(a0) ldc1 $f6,(SC_FPREGS+48)(a0) ldc1 $f8,(SC_FPREGS+64)(a0) ldc1 $f10,(SC_FPREGS+80)(a0) ldc1 $f12,(SC_FPREGS+96)(a0) ldc1 $f14,(SC_FPREGS+112)(a0) ldc1 $f16,(SC_FPREGS+128)(a0) ldc1 $f18,(SC_FPREGS+144)(a0) ldc1 $f20,(SC_FPREGS+160)(a0) ldc1 $f22,(SC_FPREGS+176)(a0) ldc1 $f24,(SC_FPREGS+192)(a0) ldc1 $f26,(SC_FPREGS+208)(a0) ldc1 $f28,(SC_FPREGS+224)(a0) ldc1 $f30,(SC_FPREGS+240)(a0) jr ra ctc1 t0,fcr31 1: jr ra nop END(_restore_fp_context)