forked from Imagelibrary/rtems
9b4422a251
Script does what is expected and tries to do it as smartly as possible. + remove occurrences of two blank comment lines next to each other after Id string line removed. + remove entire comment blocks which only exited to contain CVS Ids + If the processing left a blank line at the top of a file, it was removed.
83 lines
1.8 KiB
ArmAsm
83 lines
1.8 KiB
ArmAsm
/**
|
|
* @file
|
|
*
|
|
* @ingroup ScoreCPU
|
|
*
|
|
* @brief ARM architecture support implementation.
|
|
*/
|
|
|
|
/*
|
|
* This file contains all assembly code for the ARM implementation
|
|
* of RTEMS.
|
|
*
|
|
* Copyright (c) 2007 by Ray Xu, <Rayx.cn@gmail.com>
|
|
* Thumb support added.
|
|
*
|
|
* Copyright (c) 2002 by Advent Networks, Inc.
|
|
* Jay Monkman <jmonkman@adventnetworks.com>
|
|
*
|
|
* COPYRIGHT (c) 2000 Canon Research Centre France SA.
|
|
* Emmanuel Raguet, mailto:raguet@crf.canon.fr
|
|
*
|
|
* The license and distribution terms for this file may be
|
|
* found in the file LICENSE in this distribution or at
|
|
* http://www.rtems.com/license/LICENSE.
|
|
*
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include <rtems/asm.h>
|
|
#include <rtems/score/cpu_asm.h>
|
|
|
|
#ifdef ARM_MULTILIB_ARCH_V4
|
|
|
|
.text
|
|
|
|
/*
|
|
* void _CPU_Context_switch( run_context, heir_context )
|
|
* void _CPU_Context_restore( run_context, heir_context )
|
|
*
|
|
* This routine performs a normal non-FP context.
|
|
*
|
|
* R0 = run_context R1 = heir_context
|
|
*
|
|
* This function copies the current registers to where r0 points, then
|
|
* restores the ones from where r1 points.
|
|
*
|
|
* Using the ldm/stm opcodes save 2-3 us on 100 MHz ARM9TDMI with
|
|
* a 16 bit data bus.
|
|
*
|
|
*/
|
|
|
|
DEFINE_FUNCTION_ARM(_CPU_Context_switch)
|
|
/* Start saving context */
|
|
mrs r2, cpsr
|
|
stmia r0, {r2, r4, r5, r6, r7, r8, r9, r10, r11, r13, r14}
|
|
|
|
|
|
/* Start restoring context */
|
|
_restore:
|
|
ldmia r1, {r2, r4, r5, r6, r7, r8, r9, r10, r11, r13, r14}
|
|
msr cpsr, r2
|
|
#ifdef __thumb__
|
|
bx lr
|
|
nop
|
|
#else
|
|
mov pc, lr
|
|
#endif
|
|
/*
|
|
* void _CPU_Context_restore( new_context )
|
|
*
|
|
* This function copies the restores the registers from where r0 points.
|
|
* It must match _CPU_Context_switch()
|
|
*
|
|
*/
|
|
DEFINE_FUNCTION_ARM(_CPU_Context_restore)
|
|
mov r1, r0
|
|
b _restore
|
|
|
|
#endif /* ARM_MULTILIB_ARCH_V4 */
|