forked from Imagelibrary/rtems
88 lines
2.0 KiB
C
88 lines
2.0 KiB
C
/*
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* Copyright (c) 2013 embedded brains GmbH. All rights reserved.
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*
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* embedded brains GmbH
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* Obere Lagerstr. 30
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* 82178 Puchheim
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* Germany
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* <rtems@embedded-brains.de>
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <rtems/score/armv7m.h>
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#ifdef ARM_MULTILIB_ARCH_V7M
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void __attribute__((naked)) _ARMV7M_Exception_default( void )
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{
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__asm__ volatile (
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"sub sp, %[cpufsz]\n"
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"stm sp, {r0-r12}\n"
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"mov r2, lr\n"
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"mrs r1, msp\n"
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"mrs r0, psp\n"
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"tst lr, #4\n"
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"itt eq\n"
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"moveq r0, r1\n"
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"addeq r0, %[cpufsz]\n"
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"add r2, r0, %[v7mlroff]\n"
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"add r1, sp, %[cpulroff]\n"
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"ldm r2, {r3-r5}\n"
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"stm r1, {r3-r5}\n"
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"mrs r1, ipsr\n"
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"str r1, [sp, %[cpuvecoff]]\n"
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/* Argument for high level handler */
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"mov r0, sp\n"
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/* Clear VFP context pointer */
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"add r3, sp, %[cpuvfpoff]\n"
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"mov r1, #0\n"
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"str r1, [r3]\n"
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#ifdef ARM_MULTILIB_VFP
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/* Ensure that the FPU is enabled */
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"ldr r4, =%[cpacr]\n"
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"tst r4, #(0xf << 20)\n"
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"bne 1f\n"
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/* Save VFP context */
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"sub sp, %[vfpsz]\n"
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"add r4, sp, #4\n"
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"bic r4, r4, #7\n"
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"str r4, [r3]\n"
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"vmrs r2, FPSCR\n"
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"stmia r4!, {r1-r2}\n"
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"vstmia r4!, {d0-d15}\n"
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"mov r1, #0\n"
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"mov r2, #0\n"
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"adds r3, r4, #128\n"
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"2:\n"
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"stmia r4!, {r1-r2}\n"
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"cmp r4, r3\n"
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"bne 2b\n"
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"1:\n"
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#endif
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"b _ARM_Exception_default\n"
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:
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: [cpufsz] "i" (sizeof(CPU_Exception_frame)),
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[v7mfsz] "i" (sizeof(ARMV7M_Exception_frame)),
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[cpulroff] "i" (offsetof(CPU_Exception_frame, register_lr)),
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[v7mlroff] "i" (offsetof(ARMV7M_Exception_frame, register_lr)),
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[cpuvecoff] "J" (offsetof(CPU_Exception_frame, vector)),
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[cpuvfpoff] "i" (ARM_EXCEPTION_FRAME_VFP_CONTEXT_OFFSET),
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[cpacr] "i" (ARMV7M_CPACR),
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[vfpsz] "i" (ARM_VFP_CONTEXT_SIZE)
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);
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}
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#endif /* ARM_MULTILIB_ARCH_V7M */
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