| /* 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.abs \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 */ |
