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/* 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>
SYM_FUNC_START(__fstate_save)
li a2, TASK_THREAD_F0
add a0, a0, a2
li t1, SR_FS
csrs CSR_STATUS, 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 CSR_STATUS, t1
ret
SYM_FUNC_END(__fstate_save)
SYM_FUNC_START(__fstate_restore)
li a2, TASK_THREAD_F0
add a0, a0, a2
li t1, SR_FS
lw t0, TASK_THREAD_FCSR_F0(a0)
csrs CSR_STATUS, 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 CSR_STATUS, t1
ret
SYM_FUNC_END(__fstate_restore)
#define get_f32(which) fmv.x.s a0, which; j 2f
#define put_f32(which) fmv.s.x which, a1; j 2f
#if __riscv_xlen == 64
# define get_f64(which) fmv.x.d a0, which; j 2f
# define put_f64(which) fmv.d.x which, a1; j 2f
#else
# define get_f64(which) fsd which, 0(a1); j 2f
# define put_f64(which) fld which, 0(a1); j 2f
#endif
.macro fp_access_prologue
/*
* Compute jump offset to store the correct FP register since we don't
* have indirect FP register access
*/
sll t0, a0, 3
la t2, 1f
add t0, t0, t2
li t1, SR_FS
csrs CSR_STATUS, t1
jr t0
1:
.endm
.macro fp_access_epilogue
2:
csrc CSR_STATUS, t1
ret
.endm
#define fp_access_body(__access_func) \
__access_func(f0); \
__access_func(f1); \
__access_func(f2); \
__access_func(f3); \
__access_func(f4); \
__access_func(f5); \
__access_func(f6); \
__access_func(f7); \
__access_func(f8); \
__access_func(f9); \
__access_func(f10); \
__access_func(f11); \
__access_func(f12); \
__access_func(f13); \
__access_func(f14); \
__access_func(f15); \
__access_func(f16); \
__access_func(f17); \
__access_func(f18); \
__access_func(f19); \
__access_func(f20); \
__access_func(f21); \
__access_func(f22); \
__access_func(f23); \
__access_func(f24); \
__access_func(f25); \
__access_func(f26); \
__access_func(f27); \
__access_func(f28); \
__access_func(f29); \
__access_func(f30); \
__access_func(f31)
#ifdef CONFIG_RISCV_MISALIGNED
/*
* Disable compressed instructions set to keep a constant offset between FP
* load/store/move instructions
*/
.option norvc
/*
* put_f32_reg - Set a FP register from a register containing the value
* a0 = FP register index to be set
* a1 = value to be loaded in the FP register
*/
SYM_FUNC_START(put_f32_reg)
fp_access_prologue
fp_access_body(put_f32)
fp_access_epilogue
SYM_FUNC_END(put_f32_reg)
/*
* get_f32_reg - Get a FP register value and return it
* a0 = FP register index to be retrieved
*/
SYM_FUNC_START(get_f32_reg)
fp_access_prologue
fp_access_body(get_f32)
fp_access_epilogue
SYM_FUNC_END(get_f32_reg)
/*
* put_f64_reg - Set a 64 bits FP register from a value or a pointer.
* a0 = FP register index to be set
* a1 = value/pointer to be loaded in the FP register (when xlen == 32 bits, we
* load the value to a pointer).
*/
SYM_FUNC_START(put_f64_reg)
fp_access_prologue
fp_access_body(put_f64)
fp_access_epilogue
SYM_FUNC_END(put_f64_reg)
/*
* put_f64_reg - Get a 64 bits FP register value and returned it or store it to
* a pointer.
* a0 = FP register index to be retrieved
* a1 = If xlen == 32, pointer which should be loaded with the FP register value
* or unused if xlen == 64. In which case the FP register value is returned
* through a0
*/
SYM_FUNC_START(get_f64_reg)
fp_access_prologue
fp_access_body(get_f64)
fp_access_epilogue
SYM_FUNC_END(get_f64_reg)
#endif /* CONFIG_RISCV_MISALIGNED */
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