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-rw-r--r--arch/loongarch/include/asm/stackframe.h219
1 files changed, 219 insertions, 0 deletions
diff --git a/arch/loongarch/include/asm/stackframe.h b/arch/loongarch/include/asm/stackframe.h
new file mode 100644
index 000000000..4ca953062
--- /dev/null
+++ b/arch/loongarch/include/asm/stackframe.h
@@ -0,0 +1,219 @@
+/* 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 */