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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#ifndef _ASM_STACKFRAME_H
#define _ASM_STACKFRAME_H
#include <linux/threads.h>
#include <asm/asm.h>
#include <asm/asmmacro.h>
#include <asm/asm-offsets.h>
#include <asm/loongarch.h>
#include <asm/thread_info.h>
/* Make the addition of cfi info a little easier. */
.macro cfi_rel_offset reg offset=0 docfi=0
.if \docfi
.cfi_rel_offset \reg, \offset
.endif
.endm
.macro cfi_st reg offset=0 docfi=0
cfi_rel_offset \reg, \offset, \docfi
LONG_S \reg, sp, \offset
.endm
.macro cfi_restore reg offset=0 docfi=0
.if \docfi
.cfi_restore \reg
.endif
.endm
.macro cfi_ld reg offset=0 docfi=0
LONG_L \reg, sp, \offset
cfi_restore \reg \offset \docfi
.endm
.macro BACKUP_T0T1
csrwr t0, EXCEPTION_KS0
csrwr t1, EXCEPTION_KS1
.endm
.macro RELOAD_T0T1
csrrd t0, EXCEPTION_KS0
csrrd t1, EXCEPTION_KS1
.endm
.macro SAVE_TEMP docfi=0
RELOAD_T0T1
cfi_st t0, PT_R12, \docfi
cfi_st t1, PT_R13, \docfi
cfi_st t2, PT_R14, \docfi
cfi_st t3, PT_R15, \docfi
cfi_st t4, PT_R16, \docfi
cfi_st t5, PT_R17, \docfi
cfi_st t6, PT_R18, \docfi
cfi_st t7, PT_R19, \docfi
cfi_st t8, PT_R20, \docfi
.endm
.macro SAVE_STATIC docfi=0
cfi_st s0, PT_R23, \docfi
cfi_st s1, PT_R24, \docfi
cfi_st s2, PT_R25, \docfi
cfi_st s3, PT_R26, \docfi
cfi_st s4, PT_R27, \docfi
cfi_st s5, PT_R28, \docfi
cfi_st s6, PT_R29, \docfi
cfi_st s7, PT_R30, \docfi
cfi_st s8, PT_R31, \docfi
.endm
/*
* get_saved_sp returns the SP for the current CPU by looking in the
* kernelsp array for it. It stores the current sp in t0 and loads the
* new value in sp.
*/
.macro get_saved_sp docfi=0
la.abs t1, kernelsp
#ifdef CONFIG_SMP
csrrd t0, PERCPU_BASE_KS
LONG_ADD t1, t1, t0
#endif
move t0, sp
.if \docfi
.cfi_register sp, t0
.endif
LONG_L sp, t1, 0
.endm
.macro set_saved_sp stackp temp temp2
la.pcrel \temp, kernelsp
#ifdef CONFIG_SMP
LONG_ADD \temp, \temp, u0
#endif
LONG_S \stackp, \temp, 0
.endm
.macro SAVE_SOME docfi=0
csrrd t1, LOONGARCH_CSR_PRMD
andi t1, t1, 0x3 /* extract pplv bit */
move t0, sp
beqz t1, 8f
/* Called from user mode, new stack. */
get_saved_sp docfi=\docfi
8:
PTR_ADDI sp, sp, -PT_SIZE
.if \docfi
.cfi_def_cfa sp, 0
.endif
cfi_st t0, PT_R3, \docfi
cfi_rel_offset sp, PT_R3, \docfi
LONG_S zero, sp, PT_R0
csrrd t0, LOONGARCH_CSR_PRMD
LONG_S t0, sp, PT_PRMD
csrrd t0, LOONGARCH_CSR_CRMD
LONG_S t0, sp, PT_CRMD
csrrd t0, LOONGARCH_CSR_EUEN
LONG_S t0, sp, PT_EUEN
csrrd t0, LOONGARCH_CSR_ECFG
LONG_S t0, sp, PT_ECFG
csrrd t0, LOONGARCH_CSR_ESTAT
PTR_S t0, sp, PT_ESTAT
cfi_st ra, PT_R1, \docfi
cfi_st a0, PT_R4, \docfi
cfi_st a1, PT_R5, \docfi
cfi_st a2, PT_R6, \docfi
cfi_st a3, PT_R7, \docfi
cfi_st a4, PT_R8, \docfi
cfi_st a5, PT_R9, \docfi
cfi_st a6, PT_R10, \docfi
cfi_st a7, PT_R11, \docfi
csrrd ra, LOONGARCH_CSR_ERA
LONG_S ra, sp, PT_ERA
.if \docfi
.cfi_rel_offset ra, PT_ERA
.endif
cfi_st tp, PT_R2, \docfi
cfi_st fp, PT_R22, \docfi
/* Set thread_info if we're coming from user mode */
csrrd t0, LOONGARCH_CSR_PRMD
andi t0, t0, 0x3 /* extract pplv bit */
beqz t0, 9f
li.d tp, ~_THREAD_MASK
and tp, tp, sp
cfi_st u0, PT_R21, \docfi
csrrd u0, PERCPU_BASE_KS
9:
.endm
.macro SAVE_ALL docfi=0
SAVE_SOME \docfi
SAVE_TEMP \docfi
SAVE_STATIC \docfi
.endm
.macro RESTORE_TEMP docfi=0
cfi_ld t0, PT_R12, \docfi
cfi_ld t1, PT_R13, \docfi
cfi_ld t2, PT_R14, \docfi
cfi_ld t3, PT_R15, \docfi
cfi_ld t4, PT_R16, \docfi
cfi_ld t5, PT_R17, \docfi
cfi_ld t6, PT_R18, \docfi
cfi_ld t7, PT_R19, \docfi
cfi_ld t8, PT_R20, \docfi
.endm
.macro RESTORE_STATIC docfi=0
cfi_ld s0, PT_R23, \docfi
cfi_ld s1, PT_R24, \docfi
cfi_ld s2, PT_R25, \docfi
cfi_ld s3, PT_R26, \docfi
cfi_ld s4, PT_R27, \docfi
cfi_ld s5, PT_R28, \docfi
cfi_ld s6, PT_R29, \docfi
cfi_ld s7, PT_R30, \docfi
cfi_ld s8, PT_R31, \docfi
.endm
.macro RESTORE_SOME docfi=0
LONG_L a0, sp, PT_PRMD
andi a0, a0, 0x3 /* extract pplv bit */
beqz a0, 8f
cfi_ld u0, PT_R21, \docfi
8:
LONG_L a0, sp, PT_ERA
csrwr a0, LOONGARCH_CSR_ERA
LONG_L a0, sp, PT_PRMD
csrwr a0, LOONGARCH_CSR_PRMD
cfi_ld ra, PT_R1, \docfi
cfi_ld a0, PT_R4, \docfi
cfi_ld a1, PT_R5, \docfi
cfi_ld a2, PT_R6, \docfi
cfi_ld a3, PT_R7, \docfi
cfi_ld a4, PT_R8, \docfi
cfi_ld a5, PT_R9, \docfi
cfi_ld a6, PT_R10, \docfi
cfi_ld a7, PT_R11, \docfi
cfi_ld tp, PT_R2, \docfi
cfi_ld fp, PT_R22, \docfi
.endm
.macro RESTORE_SP_AND_RET docfi=0
cfi_ld sp, PT_R3, \docfi
ertn
.endm
.macro RESTORE_ALL_AND_RET docfi=0
RESTORE_STATIC \docfi
RESTORE_TEMP \docfi
RESTORE_SOME \docfi
RESTORE_SP_AND_RET \docfi
.endm
#endif /* _ASM_STACKFRAME_H */
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