| 0,0 → 1,231 |
|---|
| # |
| # Copyright (C) 2003-2004 Jakub Jermar |
| # All rights reserved. |
| # |
| # Redistribution and use in source and binary forms, with or without |
| # modification, are permitted provided that the following conditions |
| # are met: |
| # |
| # - Redistributions of source code must retain the above copyright |
| # notice, this list of conditions and the following disclaimer. |
| # - Redistributions in binary form must reproduce the above copyright |
| # notice, this list of conditions and the following disclaimer in the |
| # documentation and/or other materials provided with the distribution. |
| # - The name of the author may not be used to endorse or promote products |
| # derived from this software without specific prior written permission. |
| # |
| # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| # |
| |
| #include <arch/asm/regname.h> |
| #include <arch/mm/page.h> |
| #include <arch/asm/boot.h> |
| #include <arch/context_offset.h> |
| |
| .text |
| |
| .set noat |
| .set noreorder |
| .set nomacro |
| |
| .global kernel_image_start |
| .global tlb_refill_entry |
| .global cache_error_entry |
| .global exception_entry |
| .global userspace_asm |
| |
| # Save registers to space defined by \r |
| # We will change $at on the way |
| .macro REGISTERS_STORE r |
| sw $at,EOFFSET_AT(\r) |
| sw $v0,EOFFSET_V0(\r) |
| sw $v1,EOFFSET_V1(\r) |
| sw $a0,EOFFSET_A0(\r) |
| sw $a1,EOFFSET_A1(\r) |
| sw $a2,EOFFSET_A2(\r) |
| sw $a3,EOFFSET_A3(\r) |
| sw $t0,EOFFSET_T0(\r) |
| sw $t1,EOFFSET_T1(\r) |
| sw $t2,EOFFSET_T2(\r) |
| sw $t3,EOFFSET_T3(\r) |
| sw $t4,EOFFSET_T4(\r) |
| sw $t5,EOFFSET_T5(\r) |
| sw $t6,EOFFSET_T6(\r) |
| sw $t7,EOFFSET_T7(\r) |
| sw $t8,EOFFSET_T8(\r) |
| sw $t9,EOFFSET_T9(\r) |
| |
| mflo $at |
| sw $at, EOFFSET_LO(\r) |
| mfhi $at |
| sw $at, EOFFSET_HI(\r) |
| |
| sw $s0,EOFFSET_S0(\r) |
| sw $s1,EOFFSET_S1(\r) |
| sw $s2,EOFFSET_S2(\r) |
| sw $s3,EOFFSET_S3(\r) |
| sw $s4,EOFFSET_S4(\r) |
| sw $s5,EOFFSET_S5(\r) |
| sw $s6,EOFFSET_S6(\r) |
| sw $s7,EOFFSET_S7(\r) |
| sw $s8,EOFFSET_S8(\r) |
| sw $gp,EOFFSET_GP(\r) |
| sw $ra,EOFFSET_RA(\r) |
| sw $sp,EOFFSET_SP(\r) |
| |
| mfc0 $at, $status |
| sw $at,EOFFSET_STATUS(\r) |
| mfc0 $at, $epc |
| sw $at,EOFFSET_EPC(\r) |
| .endm |
| |
| .macro REGISTERS_LOAD r |
| lw $v0,EOFFSET_V0(\r) |
| lw $v1,EOFFSET_V1(\r) |
| lw $a0,EOFFSET_A0(\r) |
| lw $a1,EOFFSET_A1(\r) |
| lw $a2,EOFFSET_A2(\r) |
| lw $a3,EOFFSET_A3(\r) |
| lw $t0,EOFFSET_T0(\r) |
| lw $t1,EOFFSET_T1(\r) |
| lw $t2,EOFFSET_T2(\r) |
| lw $t3,EOFFSET_T3(\r) |
| lw $t4,EOFFSET_T4(\r) |
| lw $t5,EOFFSET_T5(\r) |
| lw $t6,EOFFSET_T6(\r) |
| lw $t7,EOFFSET_T7(\r) |
| lw $t8,EOFFSET_T8(\r) |
| lw $t9,EOFFSET_T9(\r) |
| lw $s0,EOFFSET_S0(\r) |
| lw $s1,EOFFSET_S1(\r) |
| lw $s2,EOFFSET_S2(\r) |
| lw $s3,EOFFSET_S3(\r) |
| lw $s4,EOFFSET_S4(\r) |
| lw $s5,EOFFSET_S5(\r) |
| lw $s6,EOFFSET_S6(\r) |
| lw $s7,EOFFSET_S7(\r) |
| lw $s8,EOFFSET_S8(\r) |
| lw $gp,EOFFSET_GP(\r) |
| lw $ra,EOFFSET_RA(\r) |
| |
| lw $at,EOFFSET_LO(\r) |
| mtlo $at |
| lw $at,EOFFSET_HI(\r) |
| mthi $at |
| |
| lw $at,EOFFSET_STATUS(\r) |
| mtc0 $at, $status |
| lw $at,EOFFSET_EPC(\r) |
| mtc0 $at, $epc |
| |
| lw $at,EOFFSET_AT(\r) |
| lw $sp,EOFFSET_SP(\r) |
| .endm |
| |
| # Move kernel stack pointer address to register K0 |
| # - if we are in user mode, load the appropriate stack |
| # address |
| .macro KERNEL_STACK_TO_K0 |
| # If we are in user mode |
| mfc0 $k0, $status |
| andi $k0, 0x10 |
| |
| beq $k0, $0, 1f |
| add $k0, $sp, 0 |
| |
| # Move $k0 pointer to kernel stack |
| lui $k0, %hi(supervisor_sp) |
| ori $k0, $k0, %lo(supervisor_sp) |
| # Move $k0 (superveisor_sp) |
| lw $k0, 0($k0) |
| 1: |
| .endm |
| |
| .org 0x0 |
| kernel_image_start: |
| /* Load temporary stack */ |
| lui $sp, %hi(end_stack) |
| ori $sp, $sp, %lo(end_stack) |
| |
| /* Not sure about this, but might be needed for PIC code???? */ |
| lui $gp, 0x8000 |
| |
| jal main_bsp |
| nop |
| |
| |
| .space TEMP_STACK_SIZE |
| end_stack: |
| |
| tlb_refill_entry: |
| j tlb_refill_handler |
| nop |
| |
| cache_error_entry: |
| j cache_error_handler |
| nop |
| |
| exception_entry: |
| j exception_handler |
| nop |
| |
| |
| |
| exception_handler: |
| KERNEL_STACK_TO_K0 |
| sub $k0, REGISTER_SPACE |
| REGISTERS_STORE $k0 |
| add $sp, $k0, 0 |
| |
| add $a0, $sp, 0 |
| jal exception /* exception(register_space) */ |
| nop |
| |
| REGISTERS_LOAD $sp |
| # The $sp is automatically restored to former value |
| eret |
| nop |
| |
| tlb_refill_handler: |
| KERNEL_STACK_TO_K0 |
| sub $k0, REGISTER_SPACE |
| REGISTERS_STORE $k0 |
| add $sp, $k0, 0 |
| |
| add $a0, $sp, 0 |
| jal tlb_refill /* tlb_refill(register_space) */ |
| nop |
| |
| REGISTERS_LOAD $sp |
| |
| eret |
| nop |
| |
| cache_error_handler: |
| KERNEL_STACK_TO_K0 |
| sub $sp, REGISTER_SPACE |
| REGISTERS_STORE $sp |
| add $sp, $k0, 0 |
| |
| jal cache_error |
| nop |
| |
| REGISTERS_LOAD $sp |
| |
| eret |
| nop |
| |
| userspace_asm: |
| add $sp, $a0, 0 |
| eret |
| nop |
| |