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https://github.com/AsahiLinux/u-boot
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4b3f5ed5ac
Currently the M-mode trap handler codes are in start.S. For future extension, move them to a separate file mtrap.S. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de> Reviewed-by: Anup Patel <anup@brainfault.org>
111 lines
2.7 KiB
ArmAsm
111 lines
2.7 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* M-mode Trap Handler Code for RISC-V Core
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*
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* Copyright (c) 2017 Microsemi Corporation.
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* Copyright (c) 2017 Padmarao Begari <Padmarao.Begari@microsemi.com>
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*
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* Copyright (C) 2017 Andes Technology Corporation
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* Rick Chen, Andes Technology Corporation <rick@andestech.com>
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*
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* Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
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*/
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#include <common.h>
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#include <asm/encoding.h>
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#ifdef CONFIG_32BIT
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#define LREG lw
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#define SREG sw
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#define REGBYTES 4
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#else
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#define LREG ld
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#define SREG sd
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#define REGBYTES 8
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#endif
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.text
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/* trap entry */
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.align 2
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.global trap_entry
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trap_entry:
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addi sp, sp, -32 * REGBYTES
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SREG x1, 1 * REGBYTES(sp)
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SREG x2, 2 * REGBYTES(sp)
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SREG x3, 3 * REGBYTES(sp)
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SREG x4, 4 * REGBYTES(sp)
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SREG x5, 5 * REGBYTES(sp)
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SREG x6, 6 * REGBYTES(sp)
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SREG x7, 7 * REGBYTES(sp)
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SREG x8, 8 * REGBYTES(sp)
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SREG x9, 9 * REGBYTES(sp)
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SREG x10, 10 * REGBYTES(sp)
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SREG x11, 11 * REGBYTES(sp)
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SREG x12, 12 * REGBYTES(sp)
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SREG x13, 13 * REGBYTES(sp)
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SREG x14, 14 * REGBYTES(sp)
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SREG x15, 15 * REGBYTES(sp)
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SREG x16, 16 * REGBYTES(sp)
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SREG x17, 17 * REGBYTES(sp)
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SREG x18, 18 * REGBYTES(sp)
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SREG x19, 19 * REGBYTES(sp)
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SREG x20, 20 * REGBYTES(sp)
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SREG x21, 21 * REGBYTES(sp)
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SREG x22, 22 * REGBYTES(sp)
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SREG x23, 23 * REGBYTES(sp)
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SREG x24, 24 * REGBYTES(sp)
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SREG x25, 25 * REGBYTES(sp)
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SREG x26, 26 * REGBYTES(sp)
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SREG x27, 27 * REGBYTES(sp)
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SREG x28, 28 * REGBYTES(sp)
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SREG x29, 29 * REGBYTES(sp)
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SREG x30, 30 * REGBYTES(sp)
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SREG x31, 31 * REGBYTES(sp)
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csrr a0, MODE_PREFIX(cause)
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csrr a1, MODE_PREFIX(epc)
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mv a2, sp
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jal handle_trap
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csrw MODE_PREFIX(epc), a0
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#ifdef CONFIG_RISCV_SMODE
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/* Remain in S-mode after sret */
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li t0, SSTATUS_SPP
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#else
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/* Remain in M-mode after mret */
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li t0, MSTATUS_MPP
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#endif
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csrs MODE_PREFIX(status), t0
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LREG x1, 1 * REGBYTES(sp)
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LREG x2, 2 * REGBYTES(sp)
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LREG x3, 3 * REGBYTES(sp)
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LREG x4, 4 * REGBYTES(sp)
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LREG x5, 5 * REGBYTES(sp)
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LREG x6, 6 * REGBYTES(sp)
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LREG x7, 7 * REGBYTES(sp)
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LREG x8, 8 * REGBYTES(sp)
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LREG x9, 9 * REGBYTES(sp)
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LREG x10, 10 * REGBYTES(sp)
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LREG x11, 11 * REGBYTES(sp)
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LREG x12, 12 * REGBYTES(sp)
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LREG x13, 13 * REGBYTES(sp)
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LREG x14, 14 * REGBYTES(sp)
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LREG x15, 15 * REGBYTES(sp)
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LREG x16, 16 * REGBYTES(sp)
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LREG x17, 17 * REGBYTES(sp)
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LREG x18, 18 * REGBYTES(sp)
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LREG x19, 19 * REGBYTES(sp)
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LREG x20, 20 * REGBYTES(sp)
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LREG x21, 21 * REGBYTES(sp)
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LREG x22, 22 * REGBYTES(sp)
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LREG x23, 23 * REGBYTES(sp)
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LREG x24, 24 * REGBYTES(sp)
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LREG x25, 25 * REGBYTES(sp)
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LREG x26, 26 * REGBYTES(sp)
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LREG x27, 27 * REGBYTES(sp)
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LREG x28, 28 * REGBYTES(sp)
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LREG x29, 29 * REGBYTES(sp)
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LREG x30, 30 * REGBYTES(sp)
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LREG x31, 31 * REGBYTES(sp)
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addi sp, sp, 32 * REGBYTES
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MODE_PREFIX(ret)
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