Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
163 lines
3.1 KiB
ArmAsm
163 lines
3.1 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Author: Qi Hu <huqi@loongson.cn>
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* Huacai Chen <chenhuacai@loongson.cn>
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*
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* Copyright (C) 2020-2023 Loongson Technology Corporation Limited
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*/
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#include <asm/asm.h>
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#include <asm/asmmacro.h>
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#include <asm/asm-extable.h>
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#include <asm/asm-offsets.h>
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#include <asm/errno.h>
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#include <asm/regdef.h>
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#include <asm/unwind_hints.h>
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#define SCR_REG_WIDTH 8
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.macro EX insn, reg, src, offs
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.ex\@: \insn \reg, \src, \offs
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_asm_extable .ex\@, .L_lbt_fault
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.endm
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/*
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* Save a thread's lbt context.
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*/
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SYM_FUNC_START(_save_lbt)
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movscr2gr t1, $scr0 # save scr
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stptr.d t1, a0, THREAD_SCR0
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movscr2gr t1, $scr1
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stptr.d t1, a0, THREAD_SCR1
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movscr2gr t1, $scr2
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stptr.d t1, a0, THREAD_SCR2
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movscr2gr t1, $scr3
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stptr.d t1, a0, THREAD_SCR3
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x86mfflag t1, 0x3f # save eflags
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stptr.d t1, a0, THREAD_EFLAGS
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jr ra
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SYM_FUNC_END(_save_lbt)
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EXPORT_SYMBOL(_save_lbt)
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/*
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* Restore a thread's lbt context.
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*/
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SYM_FUNC_START(_restore_lbt)
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ldptr.d t1, a0, THREAD_SCR0 # restore scr
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movgr2scr $scr0, t1
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ldptr.d t1, a0, THREAD_SCR1
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movgr2scr $scr1, t1
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ldptr.d t1, a0, THREAD_SCR2
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movgr2scr $scr2, t1
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ldptr.d t1, a0, THREAD_SCR3
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movgr2scr $scr3, t1
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ldptr.d t1, a0, THREAD_EFLAGS # restore eflags
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x86mtflag t1, 0x3f
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jr ra
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SYM_FUNC_END(_restore_lbt)
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EXPORT_SYMBOL(_restore_lbt)
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/*
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* Load scr/eflag with zero.
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*/
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SYM_FUNC_START(_init_lbt)
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movgr2scr $scr0, zero
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movgr2scr $scr1, zero
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movgr2scr $scr2, zero
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movgr2scr $scr3, zero
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x86mtflag zero, 0x3f
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jr ra
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SYM_FUNC_END(_init_lbt)
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/*
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* a0: scr
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* a1: eflag
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*/
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SYM_FUNC_START(_save_lbt_context)
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movscr2gr t1, $scr0 # save scr
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EX st.d t1, a0, (0 * SCR_REG_WIDTH)
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movscr2gr t1, $scr1
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EX st.d t1, a0, (1 * SCR_REG_WIDTH)
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movscr2gr t1, $scr2
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EX st.d t1, a0, (2 * SCR_REG_WIDTH)
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movscr2gr t1, $scr3
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EX st.d t1, a0, (3 * SCR_REG_WIDTH)
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x86mfflag t1, 0x3f # save eflags
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EX st.w t1, a1, 0
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li.w a0, 0 # success
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jr ra
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SYM_FUNC_END(_save_lbt_context)
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EXPORT_SYMBOL_GPL(_save_lbt_context)
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/*
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* a0: scr
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* a1: eflag
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*/
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SYM_FUNC_START(_restore_lbt_context)
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EX ld.d t1, a0, (0 * SCR_REG_WIDTH) # restore scr
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movgr2scr $scr0, t1
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EX ld.d t1, a0, (1 * SCR_REG_WIDTH)
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movgr2scr $scr1, t1
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EX ld.d t1, a0, (2 * SCR_REG_WIDTH)
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movgr2scr $scr2, t1
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EX ld.d t1, a0, (3 * SCR_REG_WIDTH)
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movgr2scr $scr3, t1
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EX ld.w t1, a1, 0 # restore eflags
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x86mtflag t1, 0x3f
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li.w a0, 0 # success
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jr ra
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SYM_FUNC_END(_restore_lbt_context)
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EXPORT_SYMBOL_GPL(_restore_lbt_context)
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/*
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* a0: ftop
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*/
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SYM_FUNC_START(_save_ftop_context)
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x86mftop t1
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st.w t1, a0, 0
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li.w a0, 0 # success
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jr ra
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SYM_FUNC_END(_save_ftop_context)
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EXPORT_SYMBOL_GPL(_save_ftop_context)
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/*
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* a0: ftop
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*/
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SYM_FUNC_START(_restore_ftop_context)
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ld.w t1, a0, 0
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andi t1, t1, 0x7
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la.pcrel a0, 1f
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alsl.d a0, t1, a0, 3
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jr a0
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1:
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x86mttop 0
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b 2f
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x86mttop 1
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b 2f
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x86mttop 2
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b 2f
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x86mttop 3
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b 2f
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x86mttop 4
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b 2f
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x86mttop 5
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b 2f
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x86mttop 6
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b 2f
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x86mttop 7
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2:
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li.w a0, 0 # success
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jr ra
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SYM_FUNC_END(_restore_ftop_context)
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EXPORT_SYMBOL_GPL(_restore_ftop_context)
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.L_lbt_fault:
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li.w a0, -EFAULT # failure
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jr ra
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STACK_FRAME_NON_STANDARD _restore_ftop_context
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