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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2023 StarFive Technology Co., Ltd.
*
* Author: Jee Heng Sia <jeeheng.sia@starfivetech.com>
*/
#ifndef __ASSEMBLER__
#error "Only include this from assembly code"
#endif
#ifndef __ASM_ASSEMBLER_H
#define __ASM_ASSEMBLER_H
#include <asm/asm.h>
#include <asm/asm-offsets.h>
#include <asm/csr.h>
/*
* suspend_restore_csrs - restore CSRs
*/
.macro suspend_restore_csrs
REG_L t0, (SUSPEND_CONTEXT_REGS + PT_EPC)(a0)
csrw CSR_EPC, t0
REG_L t0, (SUSPEND_CONTEXT_REGS + PT_STATUS)(a0)
csrw CSR_STATUS, t0
REG_L t0, (SUSPEND_CONTEXT_REGS + PT_BADADDR)(a0)
csrw CSR_TVAL, t0
REG_L t0, (SUSPEND_CONTEXT_REGS + PT_CAUSE)(a0)
csrw CSR_CAUSE, t0
.endm
/*
* suspend_restore_regs - Restore registers (except A0 and T0-T6)
*/
.macro suspend_restore_regs
REG_L ra, (SUSPEND_CONTEXT_REGS + PT_RA)(a0)
REG_L sp, (SUSPEND_CONTEXT_REGS + PT_SP)(a0)
REG_L gp, (SUSPEND_CONTEXT_REGS + PT_GP)(a0)
REG_L tp, (SUSPEND_CONTEXT_REGS + PT_TP)(a0)
REG_L s0, (SUSPEND_CONTEXT_REGS + PT_S0)(a0)
REG_L s1, (SUSPEND_CONTEXT_REGS + PT_S1)(a0)
REG_L a1, (SUSPEND_CONTEXT_REGS + PT_A1)(a0)
REG_L a2, (SUSPEND_CONTEXT_REGS + PT_A2)(a0)
REG_L a3, (SUSPEND_CONTEXT_REGS + PT_A3)(a0)
REG_L a4, (SUSPEND_CONTEXT_REGS + PT_A4)(a0)
REG_L a5, (SUSPEND_CONTEXT_REGS + PT_A5)(a0)
REG_L a6, (SUSPEND_CONTEXT_REGS + PT_A6)(a0)
REG_L a7, (SUSPEND_CONTEXT_REGS + PT_A7)(a0)
REG_L s2, (SUSPEND_CONTEXT_REGS + PT_S2)(a0)
REG_L s3, (SUSPEND_CONTEXT_REGS + PT_S3)(a0)
REG_L s4, (SUSPEND_CONTEXT_REGS + PT_S4)(a0)
REG_L s5, (SUSPEND_CONTEXT_REGS + PT_S5)(a0)
REG_L s6, (SUSPEND_CONTEXT_REGS + PT_S6)(a0)
REG_L s7, (SUSPEND_CONTEXT_REGS + PT_S7)(a0)
REG_L s8, (SUSPEND_CONTEXT_REGS + PT_S8)(a0)
REG_L s9, (SUSPEND_CONTEXT_REGS + PT_S9)(a0)
REG_L s10, (SUSPEND_CONTEXT_REGS + PT_S10)(a0)
REG_L s11, (SUSPEND_CONTEXT_REGS + PT_S11)(a0)
.endm
/*
* copy_page - copy 1 page (4KB) of data from source to destination
* @a0 - destination
* @a1 - source
*/
.macro copy_page a0, a1
lui a2, 0x1
add a2, a2, a0
1 :
REG_L t0, 0(a1)
REG_L t1, SZREG(a1)
REG_S t0, 0(a0)
REG_S t1, SZREG(a0)
addi a0, a0, 2 * SZREG
addi a1, a1, 2 * SZREG
bne a2, a0, 1b
.endm
#endif /* __ASM_ASSEMBLER_H */
#if defined(CONFIG_RISCV_USER_CFI) && (__riscv_xlen == 64)
.macro vdso_lpad
lpad 0
.endm
#else
.macro vdso_lpad
.endm
#endif
/*
* This macro emits a program property note section identifying
* architecture features which require special handling, mainly for
* use in assembly files included in the VDSO.
*/
#define NT_GNU_PROPERTY_TYPE_0 5
#define GNU_PROPERTY_RISCV_FEATURE_1_AND 0xc0000000
#define GNU_PROPERTY_RISCV_FEATURE_1_ZICFILP (1U << 0)
#define GNU_PROPERTY_RISCV_FEATURE_1_ZICFISS (1U << 1)
#if defined(CONFIG_RISCV_USER_CFI) && (__riscv_xlen == 64)
#define GNU_PROPERTY_RISCV_FEATURE_1_DEFAULT \
(GNU_PROPERTY_RISCV_FEATURE_1_ZICFILP | GNU_PROPERTY_RISCV_FEATURE_1_ZICFISS)
#endif
#ifdef GNU_PROPERTY_RISCV_FEATURE_1_DEFAULT
.macro emit_riscv_feature_1_and, feat = GNU_PROPERTY_RISCV_FEATURE_1_DEFAULT
.pushsection .note.gnu.property, "a"
.p2align 3
.word 4
.word 16
.word NT_GNU_PROPERTY_TYPE_0
.asciz "GNU"
.word GNU_PROPERTY_RISCV_FEATURE_1_AND
.word 4
.word \feat
.word 0
.popsection
.endm
#else
.macro emit_riscv_feature_1_and, feat = 0
.endm
#endif
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