138 lines
3.3 KiB
C
138 lines
3.3 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2019 Western Digital Corporation or its affiliates.
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*
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* Authors:
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* Anup Patel <anup.patel@wdc.com>
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*/
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#include <sbi/riscv_asm.h>
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#include <sbi/riscv_encoding.h>
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#include <sbi/riscv_unpriv.h>
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#include <sbi/sbi_bits.h>
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#include <sbi/sbi_emulate_csr.h>
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#include <sbi/sbi_error.h>
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#include <sbi/sbi_illegal_insn.h>
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#include <sbi/sbi_trap.h>
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typedef int (*illegal_insn_func)(ulong insn,
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u32 hartid, ulong mcause,
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struct sbi_trap_regs *regs,
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struct sbi_scratch *scratch);
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static int truly_illegal_insn(ulong insn,
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u32 hartid, ulong mcause,
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struct sbi_trap_regs *regs,
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struct sbi_scratch *scratch)
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{
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return sbi_trap_redirect(regs, scratch, regs->mepc, mcause, insn);
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}
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static int system_opcode_insn(ulong insn,
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u32 hartid, ulong mcause,
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struct sbi_trap_regs *regs,
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struct sbi_scratch *scratch)
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{
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int do_write, rs1_num = (insn >> 15) & 0x1f;
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ulong rs1_val = GET_RS1(insn, regs);
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int csr_num = (u32)insn >> 20;
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ulong csr_val, new_csr_val;
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if (sbi_emulate_csr_read(csr_num, hartid, regs->mstatus,
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scratch, &csr_val))
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return truly_illegal_insn(insn, hartid, mcause,
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regs, scratch);
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do_write = rs1_num;
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switch (GET_RM(insn)) {
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case 1:
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new_csr_val = rs1_val;
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do_write = 1;
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break;
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case 2:
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new_csr_val = csr_val | rs1_val;
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break;
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case 3: new_csr_val = csr_val & ~rs1_val;
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break;
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case 5:
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new_csr_val = rs1_num;
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do_write = 1;
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break;
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case 6:
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new_csr_val = csr_val | rs1_num;
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break;
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case 7:
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new_csr_val = csr_val & ~rs1_num;
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break;
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default:
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return truly_illegal_insn(insn, hartid, mcause,
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regs, scratch);
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};
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if (do_write &&
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sbi_emulate_csr_write(csr_num, hartid, regs->mstatus,
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scratch, new_csr_val))
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return truly_illegal_insn(insn, hartid, mcause,
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regs, scratch);
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SET_RD(insn, regs, csr_val);
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regs->mepc += 4;
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return 0;
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}
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static illegal_insn_func illegal_insn_table[32] = {
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truly_illegal_insn, /* 0 */
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truly_illegal_insn, /* 1 */
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truly_illegal_insn, /* 2 */
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truly_illegal_insn, /* 3 */
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truly_illegal_insn, /* 4 */
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truly_illegal_insn, /* 5 */
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truly_illegal_insn, /* 6 */
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truly_illegal_insn, /* 7 */
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truly_illegal_insn, /* 8 */
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truly_illegal_insn, /* 9 */
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truly_illegal_insn, /* 10 */
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truly_illegal_insn, /* 11 */
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truly_illegal_insn, /* 12 */
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truly_illegal_insn, /* 13 */
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truly_illegal_insn, /* 14 */
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truly_illegal_insn, /* 15 */
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truly_illegal_insn, /* 16 */
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truly_illegal_insn, /* 17 */
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truly_illegal_insn, /* 18 */
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truly_illegal_insn, /* 19 */
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truly_illegal_insn, /* 20 */
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truly_illegal_insn, /* 21 */
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truly_illegal_insn, /* 22 */
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truly_illegal_insn, /* 23 */
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truly_illegal_insn, /* 24 */
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truly_illegal_insn, /* 25 */
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truly_illegal_insn, /* 26 */
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truly_illegal_insn, /* 27 */
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system_opcode_insn, /* 28 */
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truly_illegal_insn, /* 29 */
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truly_illegal_insn, /* 30 */
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truly_illegal_insn /* 31 */
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};
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int sbi_illegal_insn_handler(u32 hartid, ulong mcause,
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struct sbi_trap_regs *regs,
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struct sbi_scratch *scratch)
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{
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ulong insn = csr_read(mbadaddr);
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if (unlikely((insn & 3) != 3)) {
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if (insn == 0)
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insn = get_insn(regs->mepc, NULL);
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if ((insn & 3) != 3)
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return truly_illegal_insn(insn, hartid, mcause,
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regs, scratch);
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}
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return illegal_insn_table[(insn & 0x7c) >> 2](insn, hartid, mcause,
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regs, scratch);
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}
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