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caffc71aad
commit 3c250aecef upstream.
When CONFIG_RANDSTRUCT enabled, members of task_struct are randomized.
There is a chance that TASK_STACK_CANARY be out of 12bit immediate's
range and causes build errors. TASK_STACK_CANARY is naturally aligned,
so fix it by replacing ld.d/st.d with ldptr.d/stptr.d which have 14bit
immediates.
Cc: stable@vger.kernel.org
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202511240656.0NaPcJs1-lkp@intel.com/
Suggested-by: Rui Wang <wangrui@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
43 lines
985 B
ArmAsm
43 lines
985 B
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2020-2022 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-offsets.h>
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#include <asm/loongarch.h>
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#include <asm/regdef.h>
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#include <asm/stackframe.h>
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#include <asm/thread_info.h>
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/*
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* task_struct *__switch_to(task_struct *prev, task_struct *next,
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* struct thread_info *next_ti)
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*/
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.align 5
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SYM_FUNC_START(__switch_to)
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csrrd t1, LOONGARCH_CSR_PRMD
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stptr.d t1, a0, THREAD_CSRPRMD
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cpu_save_nonscratch a0
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stptr.d ra, a0, THREAD_REG01
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stptr.d a3, a0, THREAD_SCHED_RA
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stptr.d a4, a0, THREAD_SCHED_CFA
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#if defined(CONFIG_STACKPROTECTOR) && !defined(CONFIG_SMP)
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la t7, __stack_chk_guard
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ldptr.d t8, a1, TASK_STACK_CANARY
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stptr.d t8, t7, 0
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#endif
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move tp, a2
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cpu_restore_nonscratch a1
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li.w t0, _THREAD_SIZE
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PTR_ADD t0, t0, tp
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set_saved_sp t0, t1, t2
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ldptr.d t1, a1, THREAD_CSRPRMD
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csrwr t1, LOONGARCH_CSR_PRMD
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jr ra
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SYM_FUNC_END(__switch_to)
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