cpu/microblaze/microblaze-exception-extensions.S

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup RTEMSScoreCPUMicroBlaze
0007  *
0008  * @brief MicroBlaze exception extensions ASM implementation
0009  */
0010
0011 /*
0012  * Copyright (C) 2022 On-Line Applications Research Corporation (OAR)
0013  *
0014  * Redistribution and use in source and binary forms, with or without
0015  * modification, are permitted provided that the following conditions
0016  * are met:
0017  * 1. Redistributions of source code must retain the above copyright
0018  *    notice, this list of conditions and the following disclaimer.
0019  * 2. Redistributions in binary form must reproduce the above copyright
0020  *    notice, this list of conditions and the following disclaimer in the
0021  *    documentation and/or other materials provided with the distribution.
0022  *
0023  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0024  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0025  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0026  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0027  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0028  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0029  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0030  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0031  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0032  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0033  * POSSIBILITY OF SUCH DAMAGE.
0034  */
0035
0036 #include <rtems/asm.h>
0037 #include <rtems/score/percpu.h>
0038
0039     .text
0040         .globl _CPU_Exception_dispatch_and_resume
0041         .globl _MicroBlaze_Exception_resume_from_exception
0042         .globl _MicroBlaze_Exception_resume_from_break
0043     .align 2
0044
0045 _CPU_Exception_dispatch_and_resume:
0046     /* Subtract 1 from ISR_NEST_LEVEL */
0047     lwi r3, r0, _Per_CPU_Information + 8
0048     addik r3, r3, -1
0049     swi r3, r0, _Per_CPU_Information + 8
0050
0051     /* Subtract 1 from THREAD_DISPATCH_DISABLE_LEVEL */
0052     lwi r3, r0, _Per_CPU_Information + 16
0053     addik r3, r3, -1
0054     swi r3, r0, _Per_CPU_Information + 16
0055
0056     /* Is THREAD_DISPATCH_DISABLE_LEVEL != 0? */
0057     bnei r3, _MicroBlaze_Exception_resume_from_exception
0058
0059     /* Is DISPATCH_NEEDED == 0? */
0060     lwi r3, r0, _Per_CPU_Information + 20
0061     beqi r3, _MicroBlaze_Exception_resume_from_exception
0062
0063     bralid r15, _Thread_Dispatch
0064     nop
0065 /* Fall through to restore exception frame */
0066
0067 _MicroBlaze_Exception_resume_from_exception:
0068     /* Move argument to stack pointer */
0069     addi r1, r5, 0
0070
0071     /* Retrieve and store MSR */
0072     lwi r3, r1, MICROBLAZE_EXCEPTION_FRAME_MSR
0073     mts rmsr, r3
0074
0075     /* Retrieve and store EAR */
0076     lwi r3, r1, MICROBLAZE_EXCEPTION_FRAME_EAR
0077     mts rear, r3
0078
0079     /* Retrieve and store ESR */
0080     lwi r3, r1, MICROBLAZE_EXCEPTION_FRAME_ESR
0081     mts resr, r3
0082
0083     /* Restore program state */
0084     lwi  r2, r1, MICROBLAZE_EXCEPTION_FRAME_R2
0085     lwi  r3, r1, MICROBLAZE_EXCEPTION_FRAME_R3
0086     lwi  r4, r1, MICROBLAZE_EXCEPTION_FRAME_R4
0087     lwi  r5, r1, MICROBLAZE_EXCEPTION_FRAME_R5
0088     lwi  r6, r1, MICROBLAZE_EXCEPTION_FRAME_R6
0089     lwi  r7, r1, MICROBLAZE_EXCEPTION_FRAME_R7
0090     lwi  r8, r1, MICROBLAZE_EXCEPTION_FRAME_R8
0091     lwi  r9, r1, MICROBLAZE_EXCEPTION_FRAME_R9
0092     lwi r10, r1, MICROBLAZE_EXCEPTION_FRAME_R10
0093     lwi r11, r1, MICROBLAZE_EXCEPTION_FRAME_R11
0094     lwi r12, r1, MICROBLAZE_EXCEPTION_FRAME_R12
0095     lwi r13, r1, MICROBLAZE_EXCEPTION_FRAME_R13
0096     lwi r14, r1, MICROBLAZE_EXCEPTION_FRAME_R14
0097     lwi r15, r1, MICROBLAZE_EXCEPTION_FRAME_R15
0098     lwi r16, r1, MICROBLAZE_EXCEPTION_FRAME_R16
0099     lwi r17, r1, MICROBLAZE_EXCEPTION_FRAME_R17
0100     lwi r18, r1, MICROBLAZE_EXCEPTION_FRAME_R18
0101     lwi r19, r1, MICROBLAZE_EXCEPTION_FRAME_R19
0102     lwi r20, r1, MICROBLAZE_EXCEPTION_FRAME_R20
0103     lwi r21, r1, MICROBLAZE_EXCEPTION_FRAME_R21
0104     lwi r22, r1, MICROBLAZE_EXCEPTION_FRAME_R22
0105     lwi r23, r1, MICROBLAZE_EXCEPTION_FRAME_R23
0106     lwi r24, r1, MICROBLAZE_EXCEPTION_FRAME_R24
0107     lwi r25, r1, MICROBLAZE_EXCEPTION_FRAME_R25
0108     lwi r26, r1, MICROBLAZE_EXCEPTION_FRAME_R26
0109     lwi r27, r1, MICROBLAZE_EXCEPTION_FRAME_R27
0110     lwi r28, r1, MICROBLAZE_EXCEPTION_FRAME_R28
0111     lwi r29, r1, MICROBLAZE_EXCEPTION_FRAME_R29
0112     lwi r30, r1, MICROBLAZE_EXCEPTION_FRAME_R30
0113     lwi r31, r1, MICROBLAZE_EXCEPTION_FRAME_R31
0114
0115     /* Free stack space */
0116     addik r1, r1, CPU_EXCEPTION_FRAME_SIZE
0117
0118     /* Return from exception mode */
0119     /* Branch to BTR is handled by upper layers */
0120     rted r17, 0
0121     nop
0122
0123 /* There is no dispatch version of resume from break */
0124 _MicroBlaze_Exception_resume_from_break:
0125     /* Move argument to stack pointer */
0126     addi r1, r5, 0
0127
0128     /* Retrieve and store MSR */
0129     lwi r3, r1, MICROBLAZE_EXCEPTION_FRAME_MSR
0130     mts rmsr, r3
0131
0132     /* Retrieve and store EAR */
0133     lwi r3, r1, MICROBLAZE_EXCEPTION_FRAME_EAR
0134     mts rear, r3
0135
0136     /* Retrieve and store ESR */
0137     lwi r3, r1, MICROBLAZE_EXCEPTION_FRAME_ESR
0138     mts resr, r3
0139
0140     /* Restore program state */
0141     lwi  r2, r1, MICROBLAZE_EXCEPTION_FRAME_R2
0142     lwi  r3, r1, MICROBLAZE_EXCEPTION_FRAME_R3
0143     lwi  r4, r1, MICROBLAZE_EXCEPTION_FRAME_R4
0144     lwi  r5, r1, MICROBLAZE_EXCEPTION_FRAME_R5
0145     lwi  r6, r1, MICROBLAZE_EXCEPTION_FRAME_R6
0146     lwi  r7, r1, MICROBLAZE_EXCEPTION_FRAME_R7
0147     lwi  r8, r1, MICROBLAZE_EXCEPTION_FRAME_R8
0148     lwi  r9, r1, MICROBLAZE_EXCEPTION_FRAME_R9
0149     lwi r10, r1, MICROBLAZE_EXCEPTION_FRAME_R10
0150     lwi r11, r1, MICROBLAZE_EXCEPTION_FRAME_R11
0151     lwi r12, r1, MICROBLAZE_EXCEPTION_FRAME_R12
0152     lwi r13, r1, MICROBLAZE_EXCEPTION_FRAME_R13
0153     lwi r14, r1, MICROBLAZE_EXCEPTION_FRAME_R14
0154     lwi r15, r1, MICROBLAZE_EXCEPTION_FRAME_R15
0155     lwi r16, r1, MICROBLAZE_EXCEPTION_FRAME_R16
0156     lwi r17, r1, MICROBLAZE_EXCEPTION_FRAME_R17
0157     lwi r18, r1, MICROBLAZE_EXCEPTION_FRAME_R18
0158     lwi r19, r1, MICROBLAZE_EXCEPTION_FRAME_R19
0159     lwi r20, r1, MICROBLAZE_EXCEPTION_FRAME_R20
0160     lwi r21, r1, MICROBLAZE_EXCEPTION_FRAME_R21
0161     lwi r22, r1, MICROBLAZE_EXCEPTION_FRAME_R22
0162     lwi r23, r1, MICROBLAZE_EXCEPTION_FRAME_R23
0163     lwi r24, r1, MICROBLAZE_EXCEPTION_FRAME_R24
0164     lwi r25, r1, MICROBLAZE_EXCEPTION_FRAME_R25
0165     lwi r26, r1, MICROBLAZE_EXCEPTION_FRAME_R26
0166     lwi r27, r1, MICROBLAZE_EXCEPTION_FRAME_R27
0167     lwi r28, r1, MICROBLAZE_EXCEPTION_FRAME_R28
0168     lwi r29, r1, MICROBLAZE_EXCEPTION_FRAME_R29
0169     lwi r30, r1, MICROBLAZE_EXCEPTION_FRAME_R30
0170     lwi r31, r1, MICROBLAZE_EXCEPTION_FRAME_R31
0171
0172     /* Free stack space */
0173     addik r1, r1, CPU_EXCEPTION_FRAME_SIZE
0174
0175     /* Return from debug mode */
0176     rtbd r16, 0
0177     nop