From 6fca8abef7e6d7be1a9e6d93dd0f2b7fbc5b28e5 Mon Sep 17 00:00:00 2001 From: Pasha Date: Tue, 20 Feb 2024 18:55:36 +0000 Subject: initial risc-v example --- riscv/include/asm/scs.h | 54 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) create mode 100644 riscv/include/asm/scs.h (limited to 'riscv/include/asm/scs.h') diff --git a/riscv/include/asm/scs.h b/riscv/include/asm/scs.h new file mode 100644 index 0000000..0e45db7 --- /dev/null +++ b/riscv/include/asm/scs.h @@ -0,0 +1,54 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_SCS_H +#define _ASM_SCS_H + +#ifdef __ASSEMBLY__ +#include + +#ifdef CONFIG_SHADOW_CALL_STACK + +/* Load init_shadow_call_stack to gp. */ +.macro scs_load_init_stack + la gp, init_shadow_call_stack + XIP_FIXUP_OFFSET gp +.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 /* __ASSEMBLY__ */ + +#endif /* _ASM_SCS_H */ -- cgit v1.2.1