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124 lines
3.7 KiB
C
124 lines
3.7 KiB
C
/*
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* Copyright (c) 2011, Anup Patel. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. No personal names or organizations' names associated with the
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* Atomthreads project may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE ATOMTHREADS PROJECT AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __ARM_ASM_MACRO_H__
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#define __ARM_ASM_MACRO_H__
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#include <arm_defines.h>
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#ifdef __ASSEMBLY__
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.macro SET_CURRENT_FLAGS flags, treg
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mrs \treg, cpsr
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orr \treg, \treg, #(\flags)
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msr cpsr, \treg
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.endm
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.macro SET_CURRENT_MODE mode
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cps #(\mode)
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.endm
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.macro SET_CURRENT_STACK new_stack
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ldr sp, \new_stack
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.endm
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.macro START_EXCEPTION_HANDLER irqname, lroffset
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.align 5
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\irqname:
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sub lr, lr, #\lroffset
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.endm
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/* Save User Registers */
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.macro PUSH_USER_REGS
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str lr, [sp, #-4]!; /* Push the return address */
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sub sp, sp, #(4*15); /* Adjust the stack pointer */
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stmia sp, {r0-r12}; /* Push user mode registers */
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add r0, sp, #(4*13); /* Adjust the stack pointer */
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stmia r0, {r13-r14}^; /* Push user mode registers */
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mov r0, r0; /* NOP for previous inst */
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mrs r0, spsr_all; /* Put the SPSR on the stack */
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str r0, [sp, #-4]!
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.endm
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/* If came from priviledged mode then push banked registers */
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.macro PUSH_BANKED_REGS skip_lable
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mov r4, r0
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and r0, r0, #CPSR_MODE_MASK
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cmp r0, #CPSR_MODE_USER
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beq \skip_lable
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add r1, sp, #(4*14)
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mrs r5, cpsr
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orr r4, r4, #(CPSR_IRQ_DISABLED | CPSR_FIQ_DISABLED)
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msr cpsr, r4
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str sp, [r1, #0]
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str lr, [r1, #4]
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msr cpsr, r5
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\skip_lable:
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.endm
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/* Call C function to handle exception */
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.macro CALL_EXCEPTION_CFUNC cfunc
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mov r0, sp
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bl \cfunc
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.endm
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/* If going back to priviledged mode then pull banked registers */
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.macro PULL_BANKED_REGS skip_lable
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ldr r0, [sp, #0]
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mov r4, r0
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and r0, r0, #CPSR_MODE_MASK
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cmp r0, #CPSR_MODE_USER
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beq \skip_lable
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add r1, sp, #(4*14)
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mrs r5, cpsr
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orr r4, r4, #(CPSR_IRQ_DISABLED | CPSR_FIQ_DISABLED)
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msr cpsr, r4
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ldr sp, [r1, #0]
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ldr lr, [r1, #4]
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msr cpsr, r5
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\skip_lable:
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.endm
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/* Restore User Registers */
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.macro PULL_USER_REGS
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ldr r0, [sp], #0x0004; /* Get SPSR from stack */
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msr spsr_all, r0;
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ldmia sp, {r0-r14}^; /* Restore registers (user) */
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mov r0, r0; /* NOP for previous isnt */
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add sp, sp, #(4*15); /* Adjust the stack pointer */
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ldr lr, [sp], #0x0004 /* Pull return address */
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.endm
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.macro END_EXCEPTION_HANDLER
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movs pc, lr
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.endm
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#endif
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#endif
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