arch/riscv/include/asm/scs.h

Source file repositories/reference/linux-study-clean/arch/riscv/include/asm/scs.h

File Facts

System
Linux kernel
Corpus path
arch/riscv/include/asm/scs.h
Extension
.h
Size
1090 bytes
Lines
54
Domain
Architecture Layer
Bucket
arch/riscv
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef _ASM_SCS_H
#define _ASM_SCS_H

#ifdef __ASSEMBLER__
#include <asm/asm-offsets.h>

#ifdef CONFIG_SHADOW_CALL_STACK

/* Load init_shadow_call_stack to gp. */
.macro scs_load_init_stack
	la	gp, init_shadow_call_stack
.endm

/* Load the per-CPU IRQ shadow call stack to gp. */
.macro scs_load_irq_stack tmp
	load_per_cpu gp, irq_shadow_call_stack_ptr, \tmp
.endm

/* Load task_scs_sp(current) to gp. */
.macro scs_load_current
	REG_L	gp, TASK_TI_SCS_SP(tp)
.endm

/* Load task_scs_sp(current) to gp, but only if tp has changed. */
.macro scs_load_current_if_task_changed prev
	beq	\prev, tp, _skip_scs
	scs_load_current
_skip_scs:
.endm

/* Save gp to task_scs_sp(current). */
.macro scs_save_current
	REG_S	gp, TASK_TI_SCS_SP(tp)
.endm

#else /* CONFIG_SHADOW_CALL_STACK */

.macro scs_load_init_stack
.endm
.macro scs_load_irq_stack tmp
.endm
.macro scs_load_current
.endm
.macro scs_load_current_if_task_changed prev
.endm
.macro scs_save_current
.endm

#endif /* CONFIG_SHADOW_CALL_STACK */
#endif /* __ASSEMBLER__ */

#endif /* _ASM_SCS_H */

Annotation

Implementation Notes