| ////////////////////////////////////////////////////////////////////////////// |
| // SPDX-FileCopyrightText: 2021, Dinesh Annayya //// |
| // //// |
| // Licensed under the Apache License, Version 2.0 (the "License"); //// |
| // you may not use this file except in compliance with the License. //// |
| // You may obtain a copy of the License at //// |
| // //// |
| // http://www.apache.org/licenses/LICENSE-2.0 //// |
| // //// |
| // Unless required by applicable law or agreed to in writing, software //// |
| // distributed under the License is distributed on an "AS IS" BASIS, //// |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied./// |
| // See the License for the specific language governing permissions and //// |
| // limitations under the License. //// |
| // SPDX-License-Identifier: Apache-2.0 //// |
| // SPDX-FileContributor: Dinesh Annayya <dinesha@opencores.org> //// |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| #include "riscv_csr_encoding.h" |
| #include "sc_test.h" |
| |
| # define LREG lw |
| # define SREG sw |
| # define REGBYTES 4 |
| |
| .globl _start |
| .globl main |
| .globl trap_entry |
| .globl handle_trap |
| .globl sc_exit |
| .weak trap_entry, handle_trap |
| |
| .text |
| .org (64*3) |
| .balign 64 |
| machine_trap_entry: |
| j trap_entry |
| |
| .balign 64 |
| |
| _start: |
| #ifndef __RVE_EXT |
| zero_int_regs 1, 31 |
| #else |
| zero_int_regs 1, 15 |
| #endif |
| # Global pointer init |
| .option push |
| .option norelax |
| la gp, __global_pointer$ |
| .option pop |
| # clear bss |
| la a1, __BSS_START__ |
| la a2, __BSS_END__ |
| j 4f |
| 3: sw zero, 0(a1) |
| add a1, a1, 4 |
| 4: bne a1, a2, 3b |
| la sp, __C_STACK_TOP__ |
| |
| // Timer init |
| li t0, mtime_ctrl |
| li t1, (1 << YCR1_MTIME_CTRL_EN) // enable, use internal clock |
| sw t1, (t0) |
| li t0, mtime_div |
| li t1, (100-1) // divide by 100 |
| sw t1, (t0) |
| li t0, mtimecmp |
| li t1, -1 |
| sw t1, (t0) // max value for mtimecmp |
| sw t1, 4(t0) |
| |
| li a0, 0 |
| li a1, 0 |
| jal main |
| j sc_exit |
| |
| trap_entry: |
| addi sp, sp, -272 |
| |
| SREG x1, 1*REGBYTES(sp) |
| SREG x2, 2*REGBYTES(sp) |
| SREG x3, 3*REGBYTES(sp) |
| SREG x4, 4*REGBYTES(sp) |
| SREG x5, 5*REGBYTES(sp) |
| SREG x6, 6*REGBYTES(sp) |
| SREG x7, 7*REGBYTES(sp) |
| SREG x8, 8*REGBYTES(sp) |
| SREG x9, 9*REGBYTES(sp) |
| SREG x10, 10*REGBYTES(sp) |
| SREG x11, 11*REGBYTES(sp) |
| SREG x12, 12*REGBYTES(sp) |
| SREG x13, 13*REGBYTES(sp) |
| SREG x14, 14*REGBYTES(sp) |
| SREG x15, 15*REGBYTES(sp) |
| #ifndef __RVE_EXT |
| SREG x16, 16*REGBYTES(sp) |
| SREG x17, 17*REGBYTES(sp) |
| SREG x18, 18*REGBYTES(sp) |
| SREG x19, 19*REGBYTES(sp) |
| SREG x20, 20*REGBYTES(sp) |
| SREG x21, 21*REGBYTES(sp) |
| SREG x22, 22*REGBYTES(sp) |
| SREG x23, 23*REGBYTES(sp) |
| SREG x24, 24*REGBYTES(sp) |
| SREG x25, 25*REGBYTES(sp) |
| SREG x26, 26*REGBYTES(sp) |
| SREG x27, 27*REGBYTES(sp) |
| SREG x28, 28*REGBYTES(sp) |
| SREG x29, 29*REGBYTES(sp) |
| SREG x30, 30*REGBYTES(sp) |
| SREG x31, 31*REGBYTES(sp) |
| #endif // __RVE_EXT |
| |
| csrr a0, mcause |
| csrr a1, mepc |
| mv a2, sp |
| jal handle_trap |
| |
| LREG x1, 1*REGBYTES(sp) |
| LREG x2, 2*REGBYTES(sp) |
| LREG x3, 3*REGBYTES(sp) |
| LREG x4, 4*REGBYTES(sp) |
| LREG x5, 5*REGBYTES(sp) |
| LREG x6, 6*REGBYTES(sp) |
| LREG x7, 7*REGBYTES(sp) |
| LREG x8, 8*REGBYTES(sp) |
| LREG x9, 9*REGBYTES(sp) |
| LREG x10, 10*REGBYTES(sp) |
| LREG x11, 11*REGBYTES(sp) |
| LREG x12, 12*REGBYTES(sp) |
| LREG x13, 13*REGBYTES(sp) |
| LREG x14, 14*REGBYTES(sp) |
| LREG x15, 15*REGBYTES(sp) |
| #ifndef __RVE_EXT |
| LREG x16, 16*REGBYTES(sp) |
| LREG x17, 17*REGBYTES(sp) |
| LREG x18, 18*REGBYTES(sp) |
| LREG x19, 19*REGBYTES(sp) |
| LREG x20, 20*REGBYTES(sp) |
| LREG x21, 21*REGBYTES(sp) |
| LREG x22, 22*REGBYTES(sp) |
| LREG x23, 23*REGBYTES(sp) |
| LREG x24, 24*REGBYTES(sp) |
| LREG x25, 25*REGBYTES(sp) |
| LREG x26, 26*REGBYTES(sp) |
| LREG x27, 27*REGBYTES(sp) |
| LREG x28, 28*REGBYTES(sp) |
| LREG x29, 29*REGBYTES(sp) |
| LREG x30, 30*REGBYTES(sp) |
| LREG x31, 31*REGBYTES(sp) |
| #endif // __RVE_EXT |
| |
| addi sp, sp, 272 |
| mret |
| |
| handle_trap: |
| j SIM_EXIT |
| |
| // end of crt.S |
