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Ilya Dmitrichenko
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cortex-m3-qemu: a working port
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‎cortex-m3-qemu/Makefile

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include ../py/mkenv.mk
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-include mpconfigport.mk
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# qstr definitions (must come before including py.mk)
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QSTR_DEFS = qstrdefsport.h
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# include py core make definitions
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include ../py/py.mk
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CROSS_COMPILE = arm-none-eabi-
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CFLAGS_CORTEX_M3 = -mthumb -mcpu=cortex-m3
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CFLAGS = -I. -I$(PY_SRC) -Wall -ansi -std=gnu99 $(CFLAGS_CORTEX_M3) $(COPT)
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#Debugging/Optimization
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ifeq ($(DEBUG), 1)
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CFLAGS += -g -DPENDSV_DEBUG
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COPT = -O0
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else
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COPT += -Os -DNDEBUG
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endif
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#LDFLAGS = --nostdlib -T stm32f405.ld -Map=$(@:.elf=.map) --cref
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LDFLAGS = -lm -T generic-m-hosted.ld # -Map=$(@:.elf=.map) --cref
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LIBS =
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# uncomment this if you want libgcc
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#LIBS += $(shell $(CC) -print-libgcc-file-name)
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SRC_C = \
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help.c \
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math.c \
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#gccollect.c \
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#pyexec.c \
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SRC_S = \
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gchelper.s \
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OBJ =
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OBJ += $(PY_O)
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OBJ += $(addprefix $(BUILD)/, $(SRC_C:.c=.o))
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OBJ += $(addprefix $(BUILD)/, $(SRC_S:.s=.o))
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all: $(BUILD)/flash.elf
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run:
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qemu-system-arm -cpu cortex-m3 -nographic -monitor null -serial null -semihosting -kernel $(BUILD)/flash.elf
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$(BUILD)/flash.elf: $(OBJ)
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$(Q)$(CC) $(CFLAGS) $(LDFLAGS) main.c -o $@ $(OBJ) $(LIBS)
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$(Q)$(SIZE) $@
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include ../py/mkrules.mk

‎cortex-m3-qemu/gccollect.c

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#include <stdio.h>
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//#include <stm32f4xx_hal.h>
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#include "misc.h"
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#include "mpconfig.h"
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#include "qstr.h"
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#include "obj.h"
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#include "gc.h"
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#include "gccollect.h"
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machine_uint_t gc_helper_get_regs_and_sp(machine_uint_t *regs);
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// obsolete
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// void gc_helper_get_regs_and_clean_stack(machine_uint_t *regs, machine_uint_t heap_end);
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void gc_collect(void) {
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// get current time, in case we want to time the GC
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uint32_t start = HAL_GetTick();
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// start the GC
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gc_collect_start();
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// scan everything in RAM before the heap
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// this includes the data and bss segments
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// TODO possibly don't need to scan data, since all pointers should start out NULL and be in bss
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gc_collect_root((void**)&_ram_start, ((uint32_t)&_ebss - (uint32_t)&_ram_start) / sizeof(uint32_t));
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// get the registers and the sp
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machine_uint_t regs[10];
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machine_uint_t sp = gc_helper_get_regs_and_sp(regs);
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// trace the stack, including the registers (since they live on the stack in this function)
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gc_collect_root((void**)sp, ((uint32_t)&_ram_end - sp) / sizeof(uint32_t));
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// end the GC
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gc_collect_end();
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if (0) {
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// print GC info
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uint32_t ticks = HAL_GetTick() - start; // TODO implement a function that does this properly
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gc_info_t info;
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gc_info(&info);
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printf("GC@%lu %lums\n", start, ticks);
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printf(" %lu total\n", info.total);
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printf(" %lu : %lu\n", info.used, info.free);
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printf(" 1=%lu 2=%lu m=%lu\n", info.num_1block, info.num_2block, info.max_block);
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}
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}
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static mp_obj_t pyb_gc(void) {
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gc_collect();
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_0(pyb_gc_obj, pyb_gc);

‎cortex-m3-qemu/gccollect.h

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// variables defining memory layout
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// (these probably belong somewhere else...)
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extern uint32_t _etext;
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extern uint32_t _sidata;
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extern uint32_t _ram_start;
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extern uint32_t _sdata;
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extern uint32_t _edata;
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extern uint32_t _sbss;
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extern uint32_t _ebss;
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extern uint32_t _heap_start;
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extern uint32_t _heap_end;
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extern uint32_t _estack;
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extern uint32_t _ram_end;
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void gc_collect(void);
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MP_DECLARE_CONST_FUN_OBJ(pyb_gc_obj);

‎cortex-m3-qemu/gchelper.s

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.syntax unified
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.cpu cortex-m4
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.thumb
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.text
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.align 2
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@ uint gc_helper_get_regs_and_sp(r0=uint regs[10])
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.global gc_helper_get_regs_and_sp
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.thumb
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.thumb_func
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.type gc_helper_get_regs_and_sp, %function
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gc_helper_get_regs_and_sp:
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@ store registers into given array
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str r4, [r0], #4
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str r5, [r0], #4
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str r6, [r0], #4
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str r7, [r0], #4
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str r8, [r0], #4
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str r9, [r0], #4
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str r10, [r0], #4
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str r11, [r0], #4
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str r12, [r0], #4
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str r13, [r0], #4
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@ return the sp
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mov r0, sp
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bx lr
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@ this next function is now obsolete
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.size gc_helper_get_regs_and_clean_stack, .-gc_helper_get_regs_and_clean_stack
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@ void gc_helper_get_regs_and_clean_stack(r0=uint regs[10], r1=heap_end)
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.global gc_helper_get_regs_and_clean_stack
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.thumb
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.thumb_func
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.type gc_helper_get_regs_and_clean_stack, %function
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gc_helper_get_regs_and_clean_stack:
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@ store registers into given array
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str r4, [r0], #4
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str r5, [r0], #4
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str r6, [r0], #4
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str r7, [r0], #4
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str r8, [r0], #4
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str r9, [r0], #4
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str r10, [r0], #4
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str r11, [r0], #4
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str r12, [r0], #4
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str r13, [r0], #4
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@ clean the stack from given pointer up to current sp
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movs r0, #0
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mov r2, sp
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b.n .entry
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.loop:
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str r0, [r1], #4
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.entry:
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cmp r1, r2
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bcc.n .loop
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bx lr
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.size gc_helper_get_regs_and_clean_stack, .-gc_helper_get_regs_and_clean_stack

‎cortex-m3-qemu/help.c

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#include <stdio.h>
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#include "nlr.h"
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#include "misc.h"
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#include "mpconfig.h"
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#include "qstr.h"
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#include "obj.h"
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STATIC const char *help_text =
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"Welcome to Micro Python!\n"
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"\n"
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"For online help please visit http://micropython.org/help/.\n"
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"\n"
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"Specific commands for the board:\n"
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" pyb.info() -- print some general information\n"
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" pyb.gc() -- run the garbage collector\n"
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" pyb.repl_info(val) -- enable/disable printing of info after each command\n"
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" pyb.delay(n) -- wait for n milliseconds\n"
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" pyb.udelay(n) -- wait for n microseconds\n"
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" pyb.switch() -- return True/False if switch pressed or not\n"
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" pyb.switch(f) -- call the given function when the switch is pressed\n"
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" pyb.Led(n) -- create Led object for LED n (n=1,2,3,4)\n"
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" Led methods: on(), off(), toggle(), intensity(<n>)\n"
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" pyb.Servo(n) -- create Servo object for servo n (n=1,2,3,4)\n"
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" Servo methods: calibrate(...), pulse_width([p]), angle([x, [t]]), speed([x, [t]])\n"
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" pyb.Accel() -- create an Accelerometer object\n"
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" Accelerometer methods: x(), y(), z(), tilt(), filtered_xyz()\n"
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" pyb.rng() -- get a 30-bit hardware random number\n"
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" pyb.gpio_in(port, [m]) -- set IO port to input, mode m\n"
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" pyb.gpio_out(port, [m]) -- set IO port to output, mode m\n"
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" pyb.gpio(port) -- get digital port value\n"
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" pyb.gpio(port, val) -- set digital port value, True or False, 1 or 0\n"
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" pyb.ADC(port) -- make an analog port object\n"
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" ADC methods: read()\n"
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"\n"
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"Ports are numbered X1-X12, X17-X22, Y1-Y12, or by their MCU name\n"
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"Port input modes are: pyb.PULL_NONE, pyb.PULL_UP, pyb.PULL_DOWN\n"
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"Port output modes are: pyb.PUSH_PULL, pyb.OPEN_DRAIN\n"
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"\n"
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"Control commands:\n"
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" CTRL-A -- on a blank line, enter raw REPL mode\n"
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" CTRL-B -- on a blank line, enter normal REPL mode\n"
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" CTRL-C -- interrupt a running program\n"
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" CTRL-D -- on a blank line, do a soft reset of the board\n"
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"\n"
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"For further help on a specific object, type help(obj)\n"
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;
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STATIC void pyb_help_print_info_about_object(mp_obj_t name_o, mp_obj_t value) {
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printf(" ");
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mp_obj_print(name_o, PRINT_STR);
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printf(" -- ");
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mp_obj_print(value, PRINT_STR);
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printf("\n");
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}
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STATIC mp_obj_t pyb_help(uint n_args, const mp_obj_t *args) {
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if (n_args == 0) {
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// print a general help message
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printf("%s", help_text);
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} else {
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// try to print something sensible about the given object
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printf("object ");
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mp_obj_print(args[0], PRINT_STR);
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printf(" is of type %s\n", mp_obj_get_type_str(args[0]));
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mp_map_t *map = NULL;
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if (MP_OBJ_IS_TYPE(args[0], &mp_type_module)) {
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map = mp_obj_dict_get_map(mp_obj_module_get_globals(args[0]));
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} else {
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mp_obj_type_t *type;
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if (MP_OBJ_IS_TYPE(args[0], &mp_type_type)) {
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type = args[0];
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} else {
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type = mp_obj_get_type(args[0]);
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}
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if (type->locals_dict != MP_OBJ_NULL && MP_OBJ_IS_TYPE(type->locals_dict, &mp_type_dict)) {
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map = mp_obj_dict_get_map(type->locals_dict);
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}
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}
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if (map != NULL) {
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for (uint i = 0; i < map->alloc; i++) {
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if (map->table[i].key != MP_OBJ_NULL) {
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pyb_help_print_info_about_object(map->table[i].key, map->table[i].value);
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}
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}
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}
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}
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_builtin_help_obj, 0, 1, pyb_help);

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