linux/arch/mips/kernel/r6000_fpu.S

/*
 * 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)
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! 2005-04-17 02:20:36 +04:00			`/*`
			`* 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>`
kbuild: mips use generic asm-offsets.h support Removed obsolete stuff from arch makefile. mips had a special rule for generating asm-offsets.h so preserved it using an architecture specific hook in top-level Kbuild file. Renamed .h file to asm-offsets.h Signed-off-by: Sam Ravnborg <sam@ravnborg.org> 2005-09-10 00:32:31 +04:00			`#include <asm/asm-offsets.h>`
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! 2005-04-17 02:20:36 +04:00			`#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)`