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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-23 02:51:47 +00:00
09f33601bf
Add basic stack protector support similar to other architectures. A constant canary value is set at boot time, and with help of compiler's -fstack-protector we can detect stack corruption. Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
42 lines
983 B
ArmAsm
42 lines
983 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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LONG_L t8, a1, TASK_STACK_CANARY
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LONG_S 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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