Extract FPU context operations from entry.S

We move __fstate_save and __fstate_restore to a new source
file, fpu.S.

Signed-off-by: Alan Kao <alankao@andestech.com>
Cc: Greentime Hu <greentime@andestech.com>
Cc: Vincent Chen <vincentc@andestech.com>
Cc: Zong Li <zong@andestech.com>
Cc: Nick Hu <nickhu@andestech.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>

arch/riscv/kernel/Makefile

@@ -13,6 +13,7 @@ extra-y += vmlinux.lds
 obj-y	+= cpu.o
 obj-y	+= cpufeature.o
 obj-y	+= entry.o
+obj-y	+= fpu.o
 obj-y	+= irq.o
 obj-y	+= process.o
 obj-y	+= ptrace.o

arch/riscv/kernel/entry.S

@@ -357,93 +357,6 @@ ENTRY(__switch_to)
 	ret
 ENDPROC(__switch_to)
 
-ENTRY(__fstate_save)
-	li  a2,  TASK_THREAD_F0
-	add a0, a0, a2
-	li t1, SR_FS
-	csrs sstatus, t1
-	frcsr t0
-	fsd f0,  TASK_THREAD_F0_F0(a0)
-	fsd f1,  TASK_THREAD_F1_F0(a0)
-	fsd f2,  TASK_THREAD_F2_F0(a0)
-	fsd f3,  TASK_THREAD_F3_F0(a0)
-	fsd f4,  TASK_THREAD_F4_F0(a0)
-	fsd f5,  TASK_THREAD_F5_F0(a0)
-	fsd f6,  TASK_THREAD_F6_F0(a0)
-	fsd f7,  TASK_THREAD_F7_F0(a0)
-	fsd f8,  TASK_THREAD_F8_F0(a0)
-	fsd f9,  TASK_THREAD_F9_F0(a0)
-	fsd f10, TASK_THREAD_F10_F0(a0)
-	fsd f11, TASK_THREAD_F11_F0(a0)
-	fsd f12, TASK_THREAD_F12_F0(a0)
-	fsd f13, TASK_THREAD_F13_F0(a0)
-	fsd f14, TASK_THREAD_F14_F0(a0)
-	fsd f15, TASK_THREAD_F15_F0(a0)
-	fsd f16, TASK_THREAD_F16_F0(a0)
-	fsd f17, TASK_THREAD_F17_F0(a0)
-	fsd f18, TASK_THREAD_F18_F0(a0)
-	fsd f19, TASK_THREAD_F19_F0(a0)
-	fsd f20, TASK_THREAD_F20_F0(a0)
-	fsd f21, TASK_THREAD_F21_F0(a0)
-	fsd f22, TASK_THREAD_F22_F0(a0)
-	fsd f23, TASK_THREAD_F23_F0(a0)
-	fsd f24, TASK_THREAD_F24_F0(a0)
-	fsd f25, TASK_THREAD_F25_F0(a0)
-	fsd f26, TASK_THREAD_F26_F0(a0)
-	fsd f27, TASK_THREAD_F27_F0(a0)
-	fsd f28, TASK_THREAD_F28_F0(a0)
-	fsd f29, TASK_THREAD_F29_F0(a0)
-	fsd f30, TASK_THREAD_F30_F0(a0)
-	fsd f31, TASK_THREAD_F31_F0(a0)
-	sw t0, TASK_THREAD_FCSR_F0(a0)
-	csrc sstatus, t1
-	ret
-ENDPROC(__fstate_save)
-
-ENTRY(__fstate_restore)
-	li  a2,  TASK_THREAD_F0
-	add a0, a0, a2
-	li t1, SR_FS
-	lw t0, TASK_THREAD_FCSR_F0(a0)
-	csrs sstatus, t1
-	fld f0,  TASK_THREAD_F0_F0(a0)
-	fld f1,  TASK_THREAD_F1_F0(a0)
-	fld f2,  TASK_THREAD_F2_F0(a0)
-	fld f3,  TASK_THREAD_F3_F0(a0)
-	fld f4,  TASK_THREAD_F4_F0(a0)
-	fld f5,  TASK_THREAD_F5_F0(a0)
-	fld f6,  TASK_THREAD_F6_F0(a0)
-	fld f7,  TASK_THREAD_F7_F0(a0)
-	fld f8,  TASK_THREAD_F8_F0(a0)
-	fld f9,  TASK_THREAD_F9_F0(a0)
-	fld f10, TASK_THREAD_F10_F0(a0)
-	fld f11, TASK_THREAD_F11_F0(a0)
-	fld f12, TASK_THREAD_F12_F0(a0)
-	fld f13, TASK_THREAD_F13_F0(a0)
-	fld f14, TASK_THREAD_F14_F0(a0)
-	fld f15, TASK_THREAD_F15_F0(a0)
-	fld f16, TASK_THREAD_F16_F0(a0)
-	fld f17, TASK_THREAD_F17_F0(a0)
-	fld f18, TASK_THREAD_F18_F0(a0)
-	fld f19, TASK_THREAD_F19_F0(a0)
-	fld f20, TASK_THREAD_F20_F0(a0)
-	fld f21, TASK_THREAD_F21_F0(a0)
-	fld f22, TASK_THREAD_F22_F0(a0)
-	fld f23, TASK_THREAD_F23_F0(a0)
-	fld f24, TASK_THREAD_F24_F0(a0)
-	fld f25, TASK_THREAD_F25_F0(a0)
-	fld f26, TASK_THREAD_F26_F0(a0)
-	fld f27, TASK_THREAD_F27_F0(a0)
-	fld f28, TASK_THREAD_F28_F0(a0)
-	fld f29, TASK_THREAD_F29_F0(a0)
-	fld f30, TASK_THREAD_F30_F0(a0)
-	fld f31, TASK_THREAD_F31_F0(a0)
-	fscsr t0
-	csrc sstatus, t1
-	ret
-ENDPROC(__fstate_restore)
-
-
 	.section ".rodata"
 	/* Exception vector table */
 ENTRY(excp_vect_table)

arch/riscv/kernel/fpu.S

@@ -0,0 +1,106 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2012 Regents of the University of California
+ * Copyright (C) 2017 SiFive
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ */
+
+#include <linux/linkage.h>
+
+#include <asm/asm.h>
+#include <asm/csr.h>
+#include <asm/asm-offsets.h>
+
+ENTRY(__fstate_save)
+	li  a2,  TASK_THREAD_F0
+	add a0, a0, a2
+	li t1, SR_FS
+	csrs sstatus, t1
+	frcsr t0
+	fsd f0,  TASK_THREAD_F0_F0(a0)
+	fsd f1,  TASK_THREAD_F1_F0(a0)
+	fsd f2,  TASK_THREAD_F2_F0(a0)
+	fsd f3,  TASK_THREAD_F3_F0(a0)
+	fsd f4,  TASK_THREAD_F4_F0(a0)
+	fsd f5,  TASK_THREAD_F5_F0(a0)
+	fsd f6,  TASK_THREAD_F6_F0(a0)
+	fsd f7,  TASK_THREAD_F7_F0(a0)
+	fsd f8,  TASK_THREAD_F8_F0(a0)
+	fsd f9,  TASK_THREAD_F9_F0(a0)
+	fsd f10, TASK_THREAD_F10_F0(a0)
+	fsd f11, TASK_THREAD_F11_F0(a0)
+	fsd f12, TASK_THREAD_F12_F0(a0)
+	fsd f13, TASK_THREAD_F13_F0(a0)
+	fsd f14, TASK_THREAD_F14_F0(a0)
+	fsd f15, TASK_THREAD_F15_F0(a0)
+	fsd f16, TASK_THREAD_F16_F0(a0)
+	fsd f17, TASK_THREAD_F17_F0(a0)
+	fsd f18, TASK_THREAD_F18_F0(a0)
+	fsd f19, TASK_THREAD_F19_F0(a0)
+	fsd f20, TASK_THREAD_F20_F0(a0)
+	fsd f21, TASK_THREAD_F21_F0(a0)
+	fsd f22, TASK_THREAD_F22_F0(a0)
+	fsd f23, TASK_THREAD_F23_F0(a0)
+	fsd f24, TASK_THREAD_F24_F0(a0)
+	fsd f25, TASK_THREAD_F25_F0(a0)
+	fsd f26, TASK_THREAD_F26_F0(a0)
+	fsd f27, TASK_THREAD_F27_F0(a0)
+	fsd f28, TASK_THREAD_F28_F0(a0)
+	fsd f29, TASK_THREAD_F29_F0(a0)
+	fsd f30, TASK_THREAD_F30_F0(a0)
+	fsd f31, TASK_THREAD_F31_F0(a0)
+	sw t0, TASK_THREAD_FCSR_F0(a0)
+	csrc sstatus, t1
+	ret
+ENDPROC(__fstate_save)
+
+ENTRY(__fstate_restore)
+	li  a2,  TASK_THREAD_F0
+	add a0, a0, a2
+	li t1, SR_FS
+	lw t0, TASK_THREAD_FCSR_F0(a0)
+	csrs sstatus, t1
+	fld f0,  TASK_THREAD_F0_F0(a0)
+	fld f1,  TASK_THREAD_F1_F0(a0)
+	fld f2,  TASK_THREAD_F2_F0(a0)
+	fld f3,  TASK_THREAD_F3_F0(a0)
+	fld f4,  TASK_THREAD_F4_F0(a0)
+	fld f5,  TASK_THREAD_F5_F0(a0)
+	fld f6,  TASK_THREAD_F6_F0(a0)
+	fld f7,  TASK_THREAD_F7_F0(a0)
+	fld f8,  TASK_THREAD_F8_F0(a0)
+	fld f9,  TASK_THREAD_F9_F0(a0)
+	fld f10, TASK_THREAD_F10_F0(a0)
+	fld f11, TASK_THREAD_F11_F0(a0)
+	fld f12, TASK_THREAD_F12_F0(a0)
+	fld f13, TASK_THREAD_F13_F0(a0)
+	fld f14, TASK_THREAD_F14_F0(a0)
+	fld f15, TASK_THREAD_F15_F0(a0)
+	fld f16, TASK_THREAD_F16_F0(a0)
+	fld f17, TASK_THREAD_F17_F0(a0)
+	fld f18, TASK_THREAD_F18_F0(a0)
+	fld f19, TASK_THREAD_F19_F0(a0)
+	fld f20, TASK_THREAD_F20_F0(a0)
+	fld f21, TASK_THREAD_F21_F0(a0)
+	fld f22, TASK_THREAD_F22_F0(a0)
+	fld f23, TASK_THREAD_F23_F0(a0)
+	fld f24, TASK_THREAD_F24_F0(a0)
+	fld f25, TASK_THREAD_F25_F0(a0)
+	fld f26, TASK_THREAD_F26_F0(a0)
+	fld f27, TASK_THREAD_F27_F0(a0)
+	fld f28, TASK_THREAD_F28_F0(a0)
+	fld f29, TASK_THREAD_F29_F0(a0)
+	fld f30, TASK_THREAD_F30_F0(a0)
+	fld f31, TASK_THREAD_F31_F0(a0)
+	fscsr t0
+	csrc sstatus, t1
+	ret
+ENDPROC(__fstate_restore)