236 lines
5.0 KiB
C
236 lines
5.0 KiB
C
/* 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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#ifndef _ASM_STACKFRAME_H
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#define _ASM_STACKFRAME_H
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#include <linux/threads.h>
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#include <asm/addrspace.h>
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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/thread_info.h>
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#include <asm/unwind_hints.h>
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/* Make the addition of cfi info a little easier. */
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.macro cfi_rel_offset reg offset=0 docfi=0
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.if \docfi
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.cfi_rel_offset \reg, \offset
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.endif
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.endm
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.macro cfi_st reg offset=0 docfi=0
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cfi_rel_offset \reg, \offset, \docfi
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LONG_S \reg, sp, \offset
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.endm
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.macro cfi_restore reg offset=0 docfi=0
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.if \docfi
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.cfi_restore \reg
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.endif
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.endm
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.macro cfi_ld reg offset=0 docfi=0
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LONG_L \reg, sp, \offset
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cfi_restore \reg \offset \docfi
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.endm
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/* Jump to the runtime virtual address. */
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.macro JUMP_VIRT_ADDR temp1 temp2
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li.d \temp1, CACHE_BASE
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pcaddi \temp2, 0
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or \temp1, \temp1, \temp2
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jirl zero, \temp1, 0xc
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.endm
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.macro BACKUP_T0T1
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csrwr t0, EXCEPTION_KS0
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csrwr t1, EXCEPTION_KS1
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.endm
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.macro RELOAD_T0T1
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csrrd t0, EXCEPTION_KS0
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csrrd t1, EXCEPTION_KS1
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.endm
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.macro SAVE_TEMP docfi=0
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RELOAD_T0T1
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cfi_st t0, PT_R12, \docfi
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cfi_st t1, PT_R13, \docfi
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cfi_st t2, PT_R14, \docfi
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cfi_st t3, PT_R15, \docfi
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cfi_st t4, PT_R16, \docfi
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cfi_st t5, PT_R17, \docfi
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cfi_st t6, PT_R18, \docfi
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cfi_st t7, PT_R19, \docfi
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cfi_st t8, PT_R20, \docfi
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.endm
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.macro SAVE_STATIC docfi=0
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cfi_st s0, PT_R23, \docfi
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cfi_st s1, PT_R24, \docfi
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cfi_st s2, PT_R25, \docfi
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cfi_st s3, PT_R26, \docfi
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cfi_st s4, PT_R27, \docfi
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cfi_st s5, PT_R28, \docfi
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cfi_st s6, PT_R29, \docfi
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cfi_st s7, PT_R30, \docfi
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cfi_st s8, PT_R31, \docfi
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.endm
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/*
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* get_saved_sp returns the SP for the current CPU by looking in the
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* kernelsp array for it. It stores the current sp in t0 and loads the
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* new value in sp.
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*/
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.macro get_saved_sp docfi=0
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la_abs t1, kernelsp
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#ifdef CONFIG_SMP
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csrrd t0, PERCPU_BASE_KS
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LONG_ADD t1, t1, t0
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#endif
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move t0, sp
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.if \docfi
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.cfi_register sp, t0
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.endif
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LONG_L sp, t1, 0
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.endm
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.macro set_saved_sp stackp temp temp2
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la.pcrel \temp, kernelsp
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#ifdef CONFIG_SMP
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LONG_ADD \temp, \temp, u0
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#endif
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LONG_S \stackp, \temp, 0
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.endm
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.macro SAVE_SOME docfi=0
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csrrd t1, LOONGARCH_CSR_PRMD
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andi t1, t1, 0x3 /* extract pplv bit */
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move t0, sp
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beqz t1, 8f
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/* Called from user mode, new stack. */
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get_saved_sp docfi=\docfi
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8:
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PTR_ADDI sp, sp, -PT_SIZE
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.if \docfi
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.cfi_def_cfa sp, 0
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.endif
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cfi_st t0, PT_R3, \docfi
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cfi_rel_offset sp, PT_R3, \docfi
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LONG_S zero, sp, PT_R0
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csrrd t0, LOONGARCH_CSR_PRMD
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LONG_S t0, sp, PT_PRMD
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csrrd t0, LOONGARCH_CSR_CRMD
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LONG_S t0, sp, PT_CRMD
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csrrd t0, LOONGARCH_CSR_EUEN
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LONG_S t0, sp, PT_EUEN
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csrrd t0, LOONGARCH_CSR_ECFG
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LONG_S t0, sp, PT_ECFG
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csrrd t0, LOONGARCH_CSR_ESTAT
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PTR_S t0, sp, PT_ESTAT
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cfi_st ra, PT_R1, \docfi
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cfi_st a0, PT_R4, \docfi
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cfi_st a1, PT_R5, \docfi
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cfi_st a2, PT_R6, \docfi
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cfi_st a3, PT_R7, \docfi
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cfi_st a4, PT_R8, \docfi
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cfi_st a5, PT_R9, \docfi
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cfi_st a6, PT_R10, \docfi
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cfi_st a7, PT_R11, \docfi
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csrrd ra, LOONGARCH_CSR_ERA
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LONG_S ra, sp, PT_ERA
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.if \docfi
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.cfi_rel_offset ra, PT_ERA
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.endif
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cfi_st tp, PT_R2, \docfi
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cfi_st fp, PT_R22, \docfi
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/* Set thread_info if we're coming from user mode */
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csrrd t0, LOONGARCH_CSR_PRMD
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andi t0, t0, 0x3 /* extract pplv bit */
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beqz t0, 9f
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li.d tp, ~_THREAD_MASK
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and tp, tp, sp
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cfi_st u0, PT_R21, \docfi
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csrrd u0, PERCPU_BASE_KS
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9:
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#ifdef CONFIG_KGDB
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li.w t0, CSR_CRMD_WE
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csrxchg t0, t0, LOONGARCH_CSR_CRMD
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#endif
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UNWIND_HINT_REGS
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.endm
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.macro SAVE_ALL docfi=0
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SAVE_SOME \docfi
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SAVE_TEMP \docfi
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SAVE_STATIC \docfi
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.endm
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.macro RESTORE_TEMP docfi=0
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cfi_ld t0, PT_R12, \docfi
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cfi_ld t1, PT_R13, \docfi
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cfi_ld t2, PT_R14, \docfi
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cfi_ld t3, PT_R15, \docfi
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cfi_ld t4, PT_R16, \docfi
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cfi_ld t5, PT_R17, \docfi
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cfi_ld t6, PT_R18, \docfi
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cfi_ld t7, PT_R19, \docfi
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cfi_ld t8, PT_R20, \docfi
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.endm
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.macro RESTORE_STATIC docfi=0
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cfi_ld s0, PT_R23, \docfi
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cfi_ld s1, PT_R24, \docfi
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cfi_ld s2, PT_R25, \docfi
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cfi_ld s3, PT_R26, \docfi
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cfi_ld s4, PT_R27, \docfi
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cfi_ld s5, PT_R28, \docfi
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cfi_ld s6, PT_R29, \docfi
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cfi_ld s7, PT_R30, \docfi
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cfi_ld s8, PT_R31, \docfi
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.endm
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.macro RESTORE_SOME docfi=0
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LONG_L a0, sp, PT_PRMD
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andi a0, a0, 0x3 /* extract pplv bit */
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beqz a0, 8f
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cfi_ld u0, PT_R21, \docfi
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8:
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LONG_L a0, sp, PT_ERA
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csrwr a0, LOONGARCH_CSR_ERA
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LONG_L a0, sp, PT_PRMD
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csrwr a0, LOONGARCH_CSR_PRMD
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cfi_ld ra, PT_R1, \docfi
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cfi_ld a0, PT_R4, \docfi
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cfi_ld a1, PT_R5, \docfi
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cfi_ld a2, PT_R6, \docfi
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cfi_ld a3, PT_R7, \docfi
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cfi_ld a4, PT_R8, \docfi
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cfi_ld a5, PT_R9, \docfi
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cfi_ld a6, PT_R10, \docfi
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cfi_ld a7, PT_R11, \docfi
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cfi_ld tp, PT_R2, \docfi
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cfi_ld fp, PT_R22, \docfi
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.endm
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.macro RESTORE_SP_AND_RET docfi=0
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cfi_ld sp, PT_R3, \docfi
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UNWIND_HINT_FUNC
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ertn
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.endm
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.macro RESTORE_ALL_AND_RET docfi=0
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RESTORE_STATIC \docfi
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RESTORE_TEMP \docfi
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RESTORE_SOME \docfi
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RESTORE_SP_AND_RET \docfi
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.endm
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#endif /* _ASM_STACKFRAME_H */
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