| 1 |
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| 2 | |
| 3 | * Copyright (C) 2023 StarFive Technology Co., Ltd.
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| 4 | *
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| 5 | * Author: Jee Heng Sia <[email protected]>
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| 6 |
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| 7 |
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| 8 | #ifndef __ASSEMBLER__
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| 9 | #error "Only include this from assembly code"
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| 10 | #endif
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| 11 |
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| 12 | #ifndef __ASM_ASSEMBLER_H
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| 13 | #define __ASM_ASSEMBLER_H
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| 14 |
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| 15 | #include <asm/asm.h>
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| 16 | #include <asm/asm-offsets.h>
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| 17 | #include <asm/csr.h>
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| 18 |
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| 19 | |
| 20 | * suspend_restore_csrs - restore CSRs
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| 21 |
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| 22 | .macro suspend_restore_csrs
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| 23 | REG_L t0, (SUSPEND_CONTEXT_REGS + PT_EPC)(a0)
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| 24 | csrw CSR_EPC, t0
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| 25 | REG_L t0, (SUSPEND_CONTEXT_REGS + PT_STATUS)(a0)
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| 26 | csrw CSR_STATUS, t0
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| 27 | REG_L t0, (SUSPEND_CONTEXT_REGS + PT_BADADDR)(a0)
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| 28 | csrw CSR_TVAL, t0
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| 29 | REG_L t0, (SUSPEND_CONTEXT_REGS + PT_CAUSE)(a0)
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| 30 | csrw CSR_CAUSE, t0
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| 31 | .endm
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| 32 |
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| 33 | |
| 34 | * suspend_restore_regs - Restore registers (except A0 and T0-T6)
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| 35 |
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| 36 | .macro suspend_restore_regs
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| 37 | REG_L ra, (SUSPEND_CONTEXT_REGS + PT_RA)(a0)
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| 38 | REG_L sp, (SUSPEND_CONTEXT_REGS + PT_SP)(a0)
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| 39 | REG_L gp, (SUSPEND_CONTEXT_REGS + PT_GP)(a0)
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| 40 | REG_L tp, (SUSPEND_CONTEXT_REGS + PT_TP)(a0)
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| 41 | REG_L s0, (SUSPEND_CONTEXT_REGS + PT_S0)(a0)
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| 42 | REG_L s1, (SUSPEND_CONTEXT_REGS + PT_S1)(a0)
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| 43 | REG_L a1, (SUSPEND_CONTEXT_REGS + PT_A1)(a0)
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| 44 | REG_L a2, (SUSPEND_CONTEXT_REGS + PT_A2)(a0)
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| 45 | REG_L a3, (SUSPEND_CONTEXT_REGS + PT_A3)(a0)
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| 46 | REG_L a4, (SUSPEND_CONTEXT_REGS + PT_A4)(a0)
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| 47 | REG_L a5, (SUSPEND_CONTEXT_REGS + PT_A5)(a0)
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| 48 | REG_L a6, (SUSPEND_CONTEXT_REGS + PT_A6)(a0)
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| 49 | REG_L a7, (SUSPEND_CONTEXT_REGS + PT_A7)(a0)
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| 50 | REG_L s2, (SUSPEND_CONTEXT_REGS + PT_S2)(a0)
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| 51 | REG_L s3, (SUSPEND_CONTEXT_REGS + PT_S3)(a0)
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| 52 | REG_L s4, (SUSPEND_CONTEXT_REGS + PT_S4)(a0)
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| 53 | REG_L s5, (SUSPEND_CONTEXT_REGS + PT_S5)(a0)
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| 54 | REG_L s6, (SUSPEND_CONTEXT_REGS + PT_S6)(a0)
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| 55 | REG_L s7, (SUSPEND_CONTEXT_REGS + PT_S7)(a0)
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| 56 | REG_L s8, (SUSPEND_CONTEXT_REGS + PT_S8)(a0)
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| 57 | REG_L s9, (SUSPEND_CONTEXT_REGS + PT_S9)(a0)
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| 58 | REG_L s10, (SUSPEND_CONTEXT_REGS + PT_S10)(a0)
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| 59 | REG_L s11, (SUSPEND_CONTEXT_REGS + PT_S11)(a0)
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| 60 | .endm
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| 61 |
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| 62 | |
| 63 | * copy_page - copy 1 page (4KB) of data from source to destination
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| 64 | * @a0 - destination
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| 65 | * @a1 - source
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| 66 |
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| 67 | .macro copy_page a0, a1
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| 68 | lui a2, 0x1
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| 69 | add a2, a2, a0
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| 70 | 1 :
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| 71 | REG_L t0, 0(a1)
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| 72 | REG_L t1, SZREG(a1)
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| 73 |
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| 74 | REG_S t0, 0(a0)
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| 75 | REG_S t1, SZREG(a0)
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| 76 |
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| 77 | addi a0, a0, 2 * SZREG
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| 78 | addi a1, a1, 2 * SZREG
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| 79 | bne a2, a0, 1b
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| 80 | .endm
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| 81 |
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| 82 | #endif
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| 83 |
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| 84 | #if defined(VDSO_CFI) && (__riscv_xlen == 64)
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| 85 | .macro vdso_lpad, label = 0
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| 86 | lpad \label
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| 87 | .endm
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| 88 | #else
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| 89 | .macro vdso_lpad, label = 0
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| 90 | .endm
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| 91 | #endif
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| 92 |
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| 93 | |
| 94 | * This macro emits a program property note section identifying
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| 95 | * architecture features which require special handling, mainly for
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| 96 | * use in assembly files included in the VDSO.
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| 97 |
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| 98 | #define NT_GNU_PROPERTY_TYPE_0 5
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| 99 | #define GNU_PROPERTY_RISCV_FEATURE_1_AND 0xc0000000
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| 100 |
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| 101 | #define GNU_PROPERTY_RISCV_FEATURE_1_ZICFILP BIT(0)
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| 102 | #define GNU_PROPERTY_RISCV_FEATURE_1_ZICFISS BIT(1)
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| 103 |
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| 104 | #if defined(VDSO_CFI) && (__riscv_xlen == 64)
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| 105 | #define GNU_PROPERTY_RISCV_FEATURE_1_DEFAULT \
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| 106 | (GNU_PROPERTY_RISCV_FEATURE_1_ZICFILP | GNU_PROPERTY_RISCV_FEATURE_1_ZICFISS)
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| 107 | #endif
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| 108 |
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| 109 | #ifdef GNU_PROPERTY_RISCV_FEATURE_1_DEFAULT
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| 110 | .macro emit_riscv_feature_1_and, feat = GNU_PROPERTY_RISCV_FEATURE_1_DEFAULT
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| 111 | .pushsection .note.gnu.property, "a"
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| 112 | .p2align 3
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| 113 | .word 4
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| 114 | .word 16
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| 115 | .word NT_GNU_PROPERTY_TYPE_0
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| 116 | .asciz "GNU"
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| 117 | .word GNU_PROPERTY_RISCV_FEATURE_1_AND
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| 118 | .word 4
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| 119 | .word \feat
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| 120 | .word 0
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| 121 | .popsection
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| 122 | .endm
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| 123 | #else
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| 124 | .macro emit_riscv_feature_1_and, feat = 0
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| 125 | .endm
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| 126 | #endif
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