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cortexm_common: enable FPU on cortex-m4f

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This commit is contained in:
Vincent Dupont 2017-02-20 18:21:13 +01:00
parent bc5e3e7721
commit 06f0c14460
3 changed files with 34 additions and 30 deletions
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36
cpu/cortexm_common/thread_arch.c
View File

@ -148,22 +148,6 @@ char *thread_stack_init(thread_task_func_t task_func,
*stk = ~((uint32_t)STACK_MARKER);
}
#if defined(CPU_ARCH_CORTEX_M4F) || (CPU_ARCH_CORTEX_M7)
/* TODO: fix FPU handling for Cortex-M4f */
/*
stk--;
*stk = (unsigned int) 0;
*/
/* S0 - S15 */
/*
for (int i = 15; i >= 0; i--) {
stk--;
*stk = i;
}
*/
#endif
/* ****************************** */
/* Automatically popped registers */
/* ****************************** */
@ -299,7 +283,7 @@ void __attribute__((naked)) __attribute__((used)) isr_pendsv(void) {
__asm__ volatile (
/* PendSV handler entry point */
/* save context by pushing unsaved registers to the stack */
/* {r0-r3,r12,LR,PC,xPSR} are saved automatically on exception entry */
/* {r0-r3,r12,LR,PC,xPSR,s0-s15,FPSCR} are saved automatically on exception entry */
".thumb_func \n"
"mrs r0, psp \n" /* get stack pointer from user mode */
#if defined(CPU_ARCH_CORTEX_M0) || defined(CPU_ARCH_CORTEX_M0PLUS)
@ -317,11 +301,13 @@ void __attribute__((naked)) __attribute__((used)) isr_pendsv(void) {
"mov r0, sp \n" /* switch back to the exception SP */
"mov sp, r12 \n"
#else
#if (defined(CPU_ARCH_CORTEX_M4F) || defined(CPU_ARCH_CORTEX_M7)) && defined(MODULE_CORTEXM_FPU)
"tst lr, #0x10 \n"
"it eq \n"
"vstmdbeq r0!, {s16-s31} \n" /* save FPU registers if FPU is used */
#endif
"stmdb r0!,{r4-r11} \n" /* save regs */
"stmdb r0!,{lr} \n" /* exception return value */
#if defined(CPU_ARCH_CORTEX_M4F) || defined(CPU_ARCH_CORTEX_M7)
/* "vstmdb sp!, {s16-s31} \n" */ /* TODO save FPU registers */
#endif
#endif
"ldr r1, =sched_active_thread \n" /* load address of current tcb */
"ldr r1, [r1] \n" /* dereference pdc */
@ -364,14 +350,16 @@ void __attribute__((naked)) __attribute__((used)) isr_svc(void) {
"ldr r0, [r0] \n" /* dereference TCB */
"ldr r1, [r0] \n" /* load tcb->sp to register 1 */
"ldmia r1!, {r0} \n" /* restore exception return value */
#if defined(CPU_ARCH_CORTEX_M4F) || defined(CPU_ARCH_CORTEX_M7)
/* "pop {s16-s31} \n" */ /* TODO load FPU registers */
#endif
"ldmia r1!, {r4-r11} \n" /* restore other registers */
#if (defined(CPU_ARCH_CORTEX_M4F) || defined(CPU_ARCH_CORTEX_M7)) && defined(MODULE_CORTEXM_FPU)
"tst r0, #0x10 \n"
"it eq \n"
"vldmiaeq r1!, {s16-s31} \n" /* load FPU registers if saved */
#endif
"msr psp, r1 \n" /* restore user mode SP to PSP reg */
"bx r0 \n" /* load exception return value to PC,
* causes end of exception*/
#endif
/* {r0-r3,r12,LR,PC,xPSR} are restored automatically on exception return */
/* {r0-r3,r12,LR,PC,xPSR,s0-s15,FPSCR} are restored automatically on exception return */
);
}

27
makefiles/arch/cortexm.inc.mk
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@ -63,14 +63,29 @@ ARCH = $(shell echo $(CPU_ARCH) | tr 'a-z-' 'A-Z_')
export CFLAGS += -DCPU_ARCH_$(ARCH)
# set the compiler specific CPU and FPU options
ifeq ($(CPU_ARCH),cortex-m4f)
# TODO: enable hard floating points for the M4F once the context save/restore
# code is adjusted to take care of FPU registers
#export CFLAGS_FPU += -mfloat-abi=hard -mfpu=fpv4-sp-d16
export MCPU := cortex-m4
endif
ifneq (,$(filter $(CPU_ARCH),cortex-m4f cortex-m7))
ifneq (,$(filter cortexm_fpu,$(DISABLE_MODULE)))
export CFLAGS_FPU ?= -mfloat-abi=soft
else
USEMODULE += cortexm_fpu
# clang assumes there is an FPU
ifneq (llvm,$(TOOLCHAIN))
ifeq ($(CPU_ARCH),cortex-m7)
export CFLAGS_FPU ?= -mfloat-abi=hard -mfpu=fpv5-d16
else
export CFLAGS_FPU ?= -mfloat-abi=hard -mfpu=fpv4-sp-d16
endif
endif
endif
ifeq ($(CPU_ARCH),cortex-m4f)
export MCPU := cortex-m4
else
export MCPU ?= $(CPU_ARCH)
endif
else
CFLAGS_FPU ?= -mfloat-abi=soft
export MCPU ?= $(CPU_ARCH)
endif
# CMSIS DSP needs to know about the CPU core
ifneq (,$(filter cmsis-dsp,$(USEPKG)))

1
makefiles/pseudomodules.inc.mk
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@ -8,6 +8,7 @@ PSEUDOMODULES += conn_can_isotp_multi
PSEUDOMODULES += cord_ep_standalone
PSEUDOMODULES += cord_epsim_standalone
PSEUDOMODULES += core_%
PSEUDOMODULES += cortexm_fpu
PSEUDOMODULES += ecc_%
PSEUDOMODULES += emb6_router
PSEUDOMODULES += event_%