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/**
* @file
* @brief ARM Cortex-M4 GCC specific floating point register macros
*/
/*
* Copyright (c) 2016, Wind River Systems, Inc.
*
* SPDX-License-Identifier: Apache-2.0
*/
#ifndef _FLOAT_REGS_ARM_GCC_H
#define _FLOAT_REGS_ARM_GCC_H
#if !defined(__GNUC__) || !defined(CONFIG_ARMV7_M_ARMV8_M_FP)
#error __FILE__ goes only with Cortex-M GCC
#endif
#include <toolchain.h>
#include "float_context.h"
/**
*
* @brief Load all floating point registers
*
* This function loads ALL floating point registers pointed to by @a regs.
* It is expected that a subsequent call to _store_all_float_registers()
* will be issued to dump the floating point registers to memory.
*
* The format/organization of 'struct fp_register_set'; the generic C test
* code (main.c) merely treat the register set as an array of bytes.
*
* The only requirement is that the arch specific implementations of
* _load_all_float_registers() and _store_all_float_registers() agree
* on the format.
*
* @return N/A
*/
static inline void _load_all_float_registers(struct fp_register_set *regs)
{
__asm__ volatile (
"vldmia %0, {s0-s15};\n\t"
"vldmia %1, {s16-s31};\n\t"
: : "r" (&regs->fp_volatile), "r" (&regs->fp_non_volatile)
);
}
/**
*
* @brief Dump all floating point registers to memory
*
* This function stores ALL floating point registers to the memory buffer
* specified by @a regs. It is expected that a previous invocation of
* _load_all_float_registers() occurred to load all the floating point
* registers from a memory buffer.
*
* @return N/A
*/
static inline void _store_all_float_registers(struct fp_register_set *regs)
{
__asm__ volatile (
"vstmia %0, {s0-s15};\n\t"
"vstmia %1, {s16-s31};\n\t"
: : "r" (&regs->fp_volatile), "r" (&regs->fp_non_volatile)
: "memory"
);
}
/**
*
* @brief Load then dump all float registers to memory
*
* This function loads ALL floating point registers from the memory buffer
* specified by @a regs, and then stores them back to that buffer.
*
* This routine is called by a high priority thread prior to calling a primitive
* that pends and triggers a co-operative context switch to a low priority
* thread.
*
* @return N/A
*/
static inline void _load_then_store_all_float_registers(struct fp_register_set
*regs)
{
_load_all_float_registers(regs);
_store_all_float_registers(regs);
}
#endif /* _FLOAT_REGS_ARM_GCC_H */