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b11654cbc9
rvc/mprv/0001-add-riscv-port.patch
Stefan b11654cbc9 add micropython with riscv32 port
2021-08-17 09:49:37 +02:00

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From 754aa0d32ec233c212b9624935172c283a49dd11 Mon Sep 17 00:00:00 2001
From: Stefan <stefan@pimaker.at>
Date: Wed, 11 Aug 2021 21:58:29 +0200
Subject: [PATCH] add riscv port
Signed-off-by: Stefan <stefan@pimaker.at>
---
lib/mp-readline/readline.c | 2 +-
lib/utils/gchelper.h | 2 +
lib/utils/gchelper_generic.c | 33 ++++++++
ports/riscv-generic/Makefile | 84 +++++++++++++++++++
ports/riscv-generic/README.md | 47 +++++++++++
ports/riscv-generic/frozentest.mpy | Bin 0 -> 196 bytes
ports/riscv-generic/frozentest.py | 7 ++
ports/riscv-generic/main.c | 125 +++++++++++++++++++++++++++++
ports/riscv-generic/mpconfigport.h | 64 +++++++++++++++
ports/riscv-generic/mphalport.h | 5 ++
ports/riscv-generic/qstrdefsport.h | 2 +
ports/riscv-generic/riscv.S | 79 ++++++++++++++++++
ports/riscv-generic/riscv.ld | 59 ++++++++++++++
ports/riscv-generic/uart_core.c | 56 +++++++++++++
py/nlr.h | 6 +-
py/nlrriscv.c | 89 ++++++++++++++++++++
py/py.cmake | 1 +
py/py.mk | 1 +
18 files changed, 660 insertions(+), 2 deletions(-)
create mode 100644 ports/riscv-generic/Makefile
create mode 100644 ports/riscv-generic/README.md
create mode 100644 ports/riscv-generic/frozentest.mpy
create mode 100644 ports/riscv-generic/frozentest.py
create mode 100644 ports/riscv-generic/main.c
create mode 100644 ports/riscv-generic/mpconfigport.h
create mode 100644 ports/riscv-generic/mphalport.h
create mode 100644 ports/riscv-generic/qstrdefsport.h
create mode 100644 ports/riscv-generic/riscv.S
create mode 100644 ports/riscv-generic/riscv.ld
create mode 100644 ports/riscv-generic/uart_core.c
create mode 100644 py/nlrriscv.c
diff --git a/lib/mp-readline/readline.c b/lib/mp-readline/readline.c
index 296c8aa4a..3ae144008 100644
--- a/lib/mp-readline/readline.c
+++ b/lib/mp-readline/readline.c
@@ -182,7 +182,7 @@ int readline_process_char(int c) {
} else if (c == CHAR_CTRL_W) {
goto backward_kill_word;
#endif
- } else if (c == '\r') {
+ } else if (c == '\r' || c == '\n') {
// newline
mp_hal_stdout_tx_str("\r\n");
readline_push_history(vstr_null_terminated_str(rl.line) + rl.orig_line_len);
diff --git a/lib/utils/gchelper.h b/lib/utils/gchelper.h
index 645ee837f..d32d7d770 100644
--- a/lib/utils/gchelper.h
+++ b/lib/utils/gchelper.h
@@ -41,6 +41,8 @@ typedef uintptr_t gc_helper_regs_t[4];
typedef uintptr_t gc_helper_regs_t[10];
#elif defined(__aarch64__)
typedef uintptr_t gc_helper_regs_t[11]; // x19-x29
+#elif defined(__riscv__)
+typedef uintptr_t gc_helper_regs_t[14];
#endif
#endif
diff --git a/lib/utils/gchelper_generic.c b/lib/utils/gchelper_generic.c
index 3e7e33ab1..77c970342 100644
--- a/lib/utils/gchelper_generic.c
+++ b/lib/utils/gchelper_generic.c
@@ -150,6 +150,39 @@ STATIC void gc_helper_get_regs(gc_helper_regs_t arr) {
arr[10] = x29;
}
+#elif defined(__riscv__)
+
+STATIC void gc_helper_get_regs(gc_helper_regs_t arr) {
+ const register long x0 asm ("sp");
+ const register long x1 asm ("s0");
+ const register long x2 asm ("s1");
+ const register long x3 asm ("s2");
+ const register long x4 asm ("s3");
+ const register long x5 asm ("s4");
+ const register long x6 asm ("s5");
+ const register long x7 asm ("s6");
+ const register long x8 asm ("s7");
+ const register long x9 asm ("s8");
+ const register long x10 asm ("s9");
+ const register long x11 asm ("s10");
+ const register long x12 asm ("s11");
+ const register long x13 asm ("ra");
+ arr[0] = x0;
+ arr[1] = x1;
+ arr[2] = x2;
+ arr[3] = x3;
+ arr[4] = x4;
+ arr[5] = x5;
+ arr[6] = x6;
+ arr[7] = x7;
+ arr[8] = x8;
+ arr[9] = x9;
+ arr[10] = x10;
+ arr[11] = x11;
+ arr[12] = x12;
+ arr[13] = x13;
+}
+
#else
#error "Architecture not supported for gc_helper_get_regs. Set MICROPY_GCREGS_SETJMP to use the fallback implementation."
diff --git a/ports/riscv-generic/Makefile b/ports/riscv-generic/Makefile
new file mode 100644
index 000000000..7efb5561a
--- /dev/null
+++ b/ports/riscv-generic/Makefile
@@ -0,0 +1,84 @@
+include ../../py/mkenv.mk
+
+CROSS = 1
+
+# qstr definitions (must come before including py.mk)
+QSTR_DEFS = qstrdefsport.h
+
+# MicroPython feature configurations
+MICROPY_ROM_TEXT_COMPRESSION ?= 0
+
+# include py core make definitions
+include $(TOP)/py/py.mk
+
+ifeq ($(CROSS), 1)
+CROSS_COMPILE ?= ../../../../buildroot-2021.05/output/host/bin/riscv32-buildroot-linux-gnu-
+endif
+
+INC += -I.
+INC += -I$(TOP)
+INC += -I$(BUILD)
+
+CFLAGS = $(INC) -march=rv32ima -mabi=ilp32 -Wall -Werror -std=c99 -nostdlib $(COPT) -fno-stack-protector -fno-pie
+LDFLAGS += -nostdlib -static
+LDFLAGS += -T./riscv.ld
+CSUPEROPT = -Os # save some code space
+
+# LIBS = -L../../../buildroot-2021.05.1/output/host/lib/gcc/riscv32-buildroot-linux-gnu/10.3.0 -L../../../buildroot-2021.05.1/output/host/riscv32-buildroot-linux-gnu/sysroot/usr/lib -lgcc -lm -lc
+
+CFLAGS += -Os -DNDEBUG
+CFLAGS += -fdata-sections -ffunction-sections
+
+# Flags for optional C++ source code
+CXXFLAGS += $(filter-out -std=c99,$(CFLAGS))
+CXXFLAGS += $(CXXFLAGS_MOD)
+
+# Flags for user C modules
+CFLAGS += $(CFLAGS_MOD)
+LDFLAGS += $(LDFLAGS_MOD)
+
+SRC_ASM = riscv.S
+ASFLAGS += -I../../../opensbi/include
+
+SRC_C = \
+ main.c \
+ uart_core.c \
+ lib/utils/printf.c \
+ lib/mp-readline/readline.c \
+ lib/utils/pyexec.c \
+ lib/utils/stdout_helpers.c \
+ $(BUILD)/_frozen_mpy.c \
+
+SRC_C += lib/libc/string0.c
+SRC_C += $(SRC_MOD)
+SRC_CXX += $(SRC_MOD_CXX)
+SRC_QSTR += $(SRC_MOD) $(SRC_MOD_CXX)
+
+OBJ += $(PY_CORE_O) $(addprefix $(BUILD)/, $(SRC_C:.c=.o))
+OBJ += $(addprefix $(BUILD)/, $(SRC_CXX:.cpp=.o))
+OBJ += riscv.o
+
+all: $(BUILD)/firmware.bin
+
+$(BUILD)/_frozen_mpy.c: frozentest.mpy $(BUILD)/genhdr/qstrdefs.generated.h
+ $(ECHO) "MISC freezing bytecode"
+ $(Q)$(TOP)/tools/mpy-tool.py -f -q $(BUILD)/genhdr/qstrdefs.preprocessed.h -mlongint-impl=none $< > $@
+
+$(BUILD)/firmware.elf: $(OBJ)
+ $(ECHO) "LINK $@"
+ $(Q)$(LD) $(LDFLAGS) -o $@ $^ $(LIBS)
+ $(Q)$(SIZE) $@
+
+$(BUILD)/firmware.bin: $(BUILD)/firmware.elf
+ $(Q)$(OBJCOPY) -O binary \
+ -j .text \
+ -j '.text.*' \
+ -j .rodata \
+ -j '.rodata.*' \
+ -j .srodata \
+ -j '.srodata.*' \
+ -j .data \
+ -j '.data.*' \
+ $^ $(BUILD)/firmware.bin
+
+include $(TOP)/py/mkrules.mk
diff --git a/ports/riscv-generic/README.md b/ports/riscv-generic/README.md
new file mode 100644
index 000000000..356fc4b3e
--- /dev/null
+++ b/ports/riscv-generic/README.md
@@ -0,0 +1,47 @@
+# The minimal port
+
+This port is intended to be a minimal MicroPython port that actually runs.
+It can run under Linux (or similar) and on any STM32F4xx MCU (eg the pyboard).
+
+## Building and running Linux version
+
+By default the port will be built for the host machine:
+
+ $ make
+
+To run the executable and get a basic working REPL do:
+
+ $ make run
+
+## Building for an STM32 MCU
+
+The Makefile has the ability to build for a Cortex-M CPU, and by default
+includes some start-up code for an STM32F4xx MCU and also enables a UART
+for communication. To build:
+
+ $ make CROSS=1
+
+If you previously built the Linux version, you will need to first run
+`make clean` to get rid of incompatible object files.
+
+Building will produce the build/firmware.dfu file which can be programmed
+to an MCU using:
+
+ $ make CROSS=1 deploy
+
+This version of the build will work out-of-the-box on a pyboard (and
+anything similar), and will give you a MicroPython REPL on UART1 at 9600
+baud. Pin PA13 will also be driven high, and this turns on the red LED on
+the pyboard.
+
+## Building without the built-in MicroPython compiler
+
+This minimal port can be built with the built-in MicroPython compiler
+disabled. This will reduce the firmware by about 20k on a Thumb2 machine,
+and by about 40k on 32-bit x86. Without the compiler the REPL will be
+disabled, but pre-compiled scripts can still be executed.
+
+To test out this feature, change the `MICROPY_ENABLE_COMPILER` config
+option to "0" in the mpconfigport.h file in this directory. Then
+recompile and run the firmware and it will execute the frozentest.py
+file.
diff --git a/ports/riscv-generic/frozentest.mpy b/ports/riscv-generic/frozentest.mpy
new file mode 100644
index 0000000000000000000000000000000000000000..8a89194a1048700453ca5b682c972e131a878610
GIT binary patch
literal 196
zcmeZeWs+BD3K0-vV3$fO%CAbzD@iRb(JQFb)X>n-)?g51s1{%=4X89>j07^38K5*H
zlxBj^O1s|A5(P3FocJ5U#h5aIN(Dhm8lQ%@Tz7t59~qd;%uuY9sF0JNm#$D;Qj`g#
zN-`2l6f%ny^74Tc(AuKB)RbbiL=@?a#A1cgyv*eMlvIUt8_#Vzw^<=MBeAGBi94wh
M=uibiBV!Xr0D7G~UjP6A
literal 0
HcmV?d00001
diff --git a/ports/riscv-generic/frozentest.py b/ports/riscv-generic/frozentest.py
new file mode 100644
index 000000000..78cdd60bf
--- /dev/null
+++ b/ports/riscv-generic/frozentest.py
@@ -0,0 +1,7 @@
+print("uPy")
+print("a long string that is not interned")
+print("a string that has unicode αβγ chars")
+print(b"bytes 1234\x01")
+print(123456789)
+for i in range(4):
+ print(i)
diff --git a/ports/riscv-generic/main.c b/ports/riscv-generic/main.c
new file mode 100644
index 000000000..7f040f5f5
--- /dev/null
+++ b/ports/riscv-generic/main.c
@@ -0,0 +1,125 @@
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "py/compile.h"
+#include "py/runtime.h"
+#include "py/repl.h"
+#include "py/gc.h"
+#include "py/mperrno.h"
+#include "py/stackctrl.h"
+#include "lib/utils/pyexec.h"
+
+#if MICROPY_ENABLE_COMPILER
+void do_str(const char *src, mp_parse_input_kind_t input_kind) {
+ nlr_buf_t nlr;
+ if (nlr_push(&nlr) == 0) {
+ mp_lexer_t *lex = mp_lexer_new_from_str_len(MP_QSTR__lt_stdin_gt_, src, strlen(src), 0);
+ qstr source_name = lex->source_name;
+ mp_parse_tree_t parse_tree = mp_parse(lex, input_kind);
+ mp_obj_t module_fun = mp_compile(&parse_tree, source_name, true);
+ mp_call_function_0(module_fun);
+ nlr_pop();
+ } else {
+ // uncaught exception
+ mp_obj_print_exception(&mp_plat_print, (mp_obj_t)nlr.ret_val);
+ }
+}
+#endif
+
+static void *stack_top;
+#if MICROPY_ENABLE_GC
+static char heap[8192*1024]; // 8 MB
+#endif
+
+int main(int argc, char **argv) {
+
+ __asm("sw sp, %0\n" : "=m" (stack_top));
+
+ mp_stack_set_top(stack_top);
+ mp_stack_set_limit(8192*1024); // 8 MB
+
+ #if MICROPY_ENABLE_GC
+ gc_init(heap, heap + sizeof(heap));
+ #endif
+ mp_init();
+ pyexec_friendly_repl();
+ mp_deinit();
+ return 0;
+}
+
+#if MICROPY_ENABLE_GC
+void gc_collect(void) {
+ void *sregs[12];
+ void *sp;
+
+ gc_collect_start();
+
+ /* push callee-save registers to
+ * stack before sweeping it */
+ __asm(
+ "sw s0, 0+%1 \n"
+ "sw s1, 4+%1 \n"
+ "sw s2, 8+%1 \n"
+ "sw s3, 12+%1 \n"
+ "sw s4, 16+%1 \n"
+ "sw s5, 20+%1 \n"
+ "sw s6, 24+%1 \n"
+ "sw s7, 28+%1 \n"
+ "sw s8, 32+%1 \n"
+ "sw s9, 36+%1 \n"
+ "sw s10, 40+%1 \n"
+ "sw s11, 44+%1 \n"
+ "mv %0, sp \n"
+ : "=r" (sp), "=o" (sregs)
+ );
+
+ gc_collect_root(sp, stack_top - sp);
+ gc_collect_end();
+}
+#endif
+
+mp_lexer_t *mp_lexer_new_from_file(const char *filename) {
+ mp_raise_OSError(MP_ENOENT);
+}
+
+mp_import_stat_t mp_import_stat(const char *path) {
+ return MP_IMPORT_STAT_NO_EXIST;
+}
+
+mp_obj_t mp_builtin_open(size_t n_args, const mp_obj_t *args, mp_map_t *kwargs) {
+ return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_KW(mp_builtin_open_obj, 1, mp_builtin_open);
+
+void nlr_jump_fail(void *val) {
+ while (1) {
+ ;
+ }
+}
+
+void NORETURN __fatal_error(const char *msg) {
+ while (1) {
+ ;
+ }
+}
+
+#ifndef NDEBUG
+void MP_WEAK __assert_func(const char *file, int line, const char *func, const char *expr) {
+ printf("Assertion '%s' failed, at file %s:%d\n", expr, file, line);
+ __fatal_error("Assertion failed");
+}
+void MP_WEAK __assert_fail(const char *expr, const char *file, unsigned int line, const char *func) {
+ printf("Assertion '%s' failed, at file %s:%d\n", expr, file, line);
+ __fatal_error("Assertion failed");
+}
+#endif
+
+void NORETURN c_start(void) {
+ // now that we have a basic system up and running we can call main
+ main(0, NULL);
+
+ // we must not return
+ for (;;) {
+ }
+}
diff --git a/ports/riscv-generic/mpconfigport.h b/ports/riscv-generic/mpconfigport.h
new file mode 100644
index 000000000..b9fcef6f4
--- /dev/null
+++ b/ports/riscv-generic/mpconfigport.h
@@ -0,0 +1,64 @@
+#include <stdint.h>
+
+// options to control how MicroPython is built
+
+// You can disable the built-in MicroPython compiler by setting the following
+// config option to 0. If you do this then you won't get a REPL prompt, but you
+// will still be able to execute pre-compiled scripts, compiled with mpy-cross.
+#define MICROPY_ENABLE_COMPILER (1)
+
+#define MICROPY_QSTR_BYTES_IN_HASH (1)
+#define MICROPY_ALLOC_PATH_MAX (256)
+#define MICROPY_ALLOC_PARSE_CHUNK_INIT (16)
+#define MICROPY_COMP_CONST (0)
+#define MICROPY_COMP_DOUBLE_TUPLE_ASSIGN (0)
+#define MICROPY_ENABLE_GC (1)
+#define MICROPY_GC_ALLOC_THRESHOLD (0)
+#define MICROPY_HELPER_REPL (1)
+#define MICROPY_ERROR_REPORTING (MICROPY_ERROR_REPORTING_TERSE)
+#define MICROPY_BUILTIN_METHOD_CHECK_SELF_ARG (0)
+#define MICROPY_PY_ASYNC_AWAIT (0)
+#define MICROPY_PY_ASSIGN_EXPR (0)
+#define MICROPY_PY_BUILTINS_BYTEARRAY (0)
+#define MICROPY_PY_BUILTINS_DICT_FROMKEYS (0)
+#define MICROPY_PY_BUILTINS_ENUMERATE (0)
+#define MICROPY_PY_BUILTINS_FILTER (0)
+#define MICROPY_PY_BUILTINS_REVERSED (0)
+#define MICROPY_PY_BUILTINS_SET (0)
+#define MICROPY_PY_BUILTINS_SLICE (0)
+#define MICROPY_PY_BUILTINS_PROPERTY (0)
+#define MICROPY_PY_BUILTINS_MIN_MAX (0)
+#define MICROPY_PY_BUILTINS_STR_COUNT (0)
+#define MICROPY_PY_BUILTINS_STR_OP_MODULO (0)
+#define MICROPY_PY___FILE__ (0)
+#define MICROPY_PY_GC (0)
+#define MICROPY_PY_ARRAY (0)
+#define MICROPY_PY_ATTRTUPLE (0)
+#define MICROPY_PY_COLLECTIONS (0)
+#define MICROPY_PY_IO (0)
+#define MICROPY_PY_STRUCT (0)
+#define MICROPY_PY_SYS (0)
+#define MICROPY_MODULE_FROZEN_MPY (1)
+#define MICROPY_CPYTHON_COMPAT (0)
+#define MICROPY_MODULE_GETATTR (0)
+
+// type definitions for the specific machine
+
+typedef intptr_t mp_int_t; // must be pointer size
+typedef uintptr_t mp_uint_t; // must be pointer size
+typedef long mp_off_t;
+
+// extra built in names to add to the global namespace
+#define MICROPY_PORT_BUILTINS \
+ { MP_ROM_QSTR(MP_QSTR_open), MP_ROM_PTR(&mp_builtin_open_obj) },
+
+// We need to provide a declaration/definition of alloca()
+#include <alloca.h>
+
+#define MICROPY_HW_BOARD_NAME "minimal"
+#define MICROPY_HW_MCU_NAME "generic,rvc"
+
+#define MP_STATE_PORT MP_STATE_VM
+
+#define MICROPY_PORT_ROOT_POINTERS \
+ const char *readline_hist[8];
diff --git a/ports/riscv-generic/mphalport.h b/ports/riscv-generic/mphalport.h
new file mode 100644
index 000000000..5130d19a2
--- /dev/null
+++ b/ports/riscv-generic/mphalport.h
@@ -0,0 +1,5 @@
+static inline mp_uint_t mp_hal_ticks_ms(void) {
+ return 0;
+}
+static inline void mp_hal_set_interrupt_char(char c) {
+}
diff --git a/ports/riscv-generic/qstrdefsport.h b/ports/riscv-generic/qstrdefsport.h
new file mode 100644
index 000000000..00d3e2ae3
--- /dev/null
+++ b/ports/riscv-generic/qstrdefsport.h
@@ -0,0 +1,2 @@
+// qstrs specific to this port
+// *FORMAT-OFF*
diff --git a/ports/riscv-generic/riscv.S b/ports/riscv-generic/riscv.S
new file mode 100644
index 000000000..9cc2c5474
--- /dev/null
+++ b/ports/riscv-generic/riscv.S
@@ -0,0 +1,79 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2019 Western Digital Corporation or its affiliates.
+ *
+ * Authors:
+ * Anup Patel <anup.patel@wdc.com>
+ */
+
+#include "sbi/riscv_encoding.h"
+#define __ASM_STR(x) x
+
+#if __riscv_xlen == 64
+#define __REG_SEL(a, b) __ASM_STR(a)
+#define RISCV_PTR .dword
+#elif __riscv_xlen == 32
+#define __REG_SEL(a, b) __ASM_STR(b)
+#define RISCV_PTR .word
+#else
+#error "Unexpected __riscv_xlen"
+#endif
+
+#define REG_L __REG_SEL(ld, lw)
+#define REG_S __REG_SEL(sd, sw)
+
+ .section .entry, "ax", %progbits
+ .align 3
+ .globl _start
+_start:
+ /* Pick one hart to run the main boot sequence */
+ lla a3, _hart_lottery
+ li a2, 1
+ amoadd.w a3, a2, (a3)
+ bnez a3, _start_hang
+
+ /* Save a0 and a1 */
+ lla a3, _boot_a0
+ REG_S a0, 0(a3)
+ lla a3, _boot_a1
+ REG_S a1, 0(a3)
+
+_start_warm:
+ /* Disable and clear all interrupts */
+ csrw CSR_SIE, zero
+ csrw CSR_SIP, zero
+
+ /* Setup exception vectors */
+ lla a3, _start_hang
+ csrw CSR_STVEC, a3
+
+ /* Setup stack */
+ lla sp, _estack
+
+ /* Jump to C main */
+ lla a3, _boot_a0
+ REG_L a0, 0(a3)
+ lla a3, _boot_a1
+ REG_L a1, 0(a3)
+ call c_start
+
+ /* We don't expect to reach here hence just hang */
+ j _start_hang
+
+ .section .entry, "ax", %progbits
+ .align 3
+ .globl _start_hang
+_start_hang:
+ wfi
+ j _start_hang
+
+ .section .entry, "ax", %progbits
+ .align 3
+_hart_lottery:
+ RISCV_PTR 0
+_boot_a0:
+ RISCV_PTR 0
+_boot_a1:
+ RISCV_PTR 0
+
diff --git a/ports/riscv-generic/riscv.ld b/ports/riscv-generic/riscv.ld
new file mode 100644
index 000000000..28ef02f64
--- /dev/null
+++ b/ports/riscv-generic/riscv.ld
@@ -0,0 +1,59 @@
+/*
+ GNU linker script for STM32F405
+*/
+
+/* Specify the memory areas */
+MEMORY
+{
+ RAM : ORIGIN = 0x80400000, LENGTH = 32M
+}
+
+/* top end of the stack */
+_estack = ORIGIN(RAM) + LENGTH(RAM);
+
+/* define output sections */
+SECTIONS
+{
+ /* The program code and other data goes into FLASH */
+ .text :
+ {
+ . = ALIGN(4);
+ *(.entry)
+ *(.text) /* .text sections (code) */
+ *(.text*) /* .text* sections (code) */
+ *(.rodata) /* .rodata sections (constants, strings, etc.) */
+ *(.rodata*) /* .rodata* sections (constants, strings, etc.) */
+
+ . = ALIGN(4);
+ _etext = .; /* define a global symbol at end of code */
+ _sidata = _etext; /* This is used by the startup in order to initialize the .data secion */
+ } >RAM
+
+ /* This is the initialized data section
+ The program executes knowing that the data is in the RAM
+ but the loader puts the initial values in the FLASH (inidata).
+ It is one task of the startup to copy the initial values from FLASH to RAM. */
+ .data : AT ( _sidata )
+ {
+ . = ALIGN(4);
+ _sdata = .; /* create a global symbol at data start; used by startup code in order to initialise the .data section in RAM */
+ *(.data) /* .data sections */
+ *(.data*) /* .data* sections */
+
+ . = ALIGN(4);
+ _edata = .; /* define a global symbol at data end; used by startup code in order to initialise the .data section in RAM */
+ } >RAM
+
+ /* Uninitialized data section */
+ .bss :
+ {
+ . = ALIGN(4);
+ _sbss = .; /* define a global symbol at bss start; used by startup code */
+ *(.bss)
+ *(.bss*)
+ *(COMMON)
+
+ . = ALIGN(4);
+ _ebss = .; /* define a global symbol at bss end; used by startup code */
+ } >RAM
+}
diff --git a/ports/riscv-generic/uart_core.c b/ports/riscv-generic/uart_core.c
new file mode 100644
index 000000000..cca9a3f9c
--- /dev/null
+++ b/ports/riscv-generic/uart_core.c
@@ -0,0 +1,56 @@
+#include "py/mpconfig.h"
+
+/*
+ * Core UART functions to implement for a port
+ */
+
+/* SBI Extension IDs */
+#define SBI_EXT_0_1_SET_TIMER 0x0
+#define SBI_EXT_0_1_CONSOLE_PUTCHAR 0x1
+#define SBI_EXT_0_1_CONSOLE_GETCHAR 0x2
+#define SBI_EXT_0_1_CLEAR_IPI 0x3
+#define SBI_EXT_0_1_SEND_IPI 0x4
+#define SBI_EXT_0_1_REMOTE_FENCE_I 0x5
+#define SBI_EXT_0_1_REMOTE_SFENCE_VMA 0x6
+#define SBI_EXT_0_1_REMOTE_SFENCE_VMA_ASID 0x7
+#define SBI_EXT_0_1_SHUTDOWN 0x8
+
+#define SBI_ECALL(__num, __a0, __a1, __a2) \
+ ({ \
+ register unsigned long a0 __asm("a0") = (unsigned long)(__a0); \
+ register unsigned long a1 __asm("a1") = (unsigned long)(__a1); \
+ register unsigned long a2 __asm("a2") = (unsigned long)(__a2); \
+ register unsigned long a7 __asm("a7") = (unsigned long)(__num); \
+ __asm volatile("ecall" \
+ : "+r"(a0) \
+ : "r"(a1), "r"(a2), "r"(a7) \
+ : "memory"); \
+ a0; \
+ })
+
+#define SBI_ECALL_0(__num) SBI_ECALL(__num, 0, 0, 0)
+#define SBI_ECALL_1(__num, __a0) SBI_ECALL(__num, __a0, 0, 0)
+#define SBI_ECALL_2(__num, __a0, __a1) SBI_ECALL(__num, __a0, __a1, 0)
+
+#define sbi_ecall_console_putc(c) SBI_ECALL_1(SBI_EXT_0_1_CONSOLE_PUTCHAR, (c))
+#define sbi_ecall_console_getc() SBI_ECALL_0(SBI_EXT_0_1_CONSOLE_GETCHAR)
+
+static inline void sbi_ecall_console_puts(const char *str)
+{
+ while (str && *str)
+ sbi_ecall_console_putc(*str++);
+}
+
+// Receive single character
+int mp_hal_stdin_rx_chr(void) {
+ unsigned char c = 0;
+ while (!(c = sbi_ecall_console_getc())) {}
+ return c;
+}
+
+// Send string of given length
+void mp_hal_stdout_tx_strn(const char *str, mp_uint_t len) {
+ while (len--) {
+ sbi_ecall_console_putc(*str++);
+ }
+}
diff --git a/py/nlr.h b/py/nlr.h
index 9f12ede9c..d760bbf27 100644
--- a/py/nlr.h
+++ b/py/nlr.h
@@ -42,6 +42,7 @@
#define MICROPY_NLR_NUM_REGS_AARCH64 (13)
#define MICROPY_NLR_NUM_REGS_XTENSA (10)
#define MICROPY_NLR_NUM_REGS_XTENSAWIN (17)
+#define MICROPY_NLR_NUM_REGS_RISCV (14)
// *FORMAT-OFF*
@@ -83,8 +84,11 @@
#define MICROPY_NLR_POWERPC (1)
// this could be less but using 128 for safety
#define MICROPY_NLR_NUM_REGS (128)
+#elif defined(__riscv)
+ #define MICROPY_NLR_RISCV (1)
+ #define MICROPY_NLR_NUM_REGS (MICROPY_NLR_NUM_REGS_RISCV)
#else
- #define MICROPY_NLR_SETJMP (1)
+ #error "NO SETJMP PLZ"
//#warning "No native NLR support for this arch, using setjmp implementation"
#endif
#endif
diff --git a/py/nlrriscv.c b/py/nlrriscv.c
new file mode 100644
index 000000000..685ea5761
--- /dev/null
+++ b/py/nlrriscv.c
@@ -0,0 +1,89 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Emil Renner Berthing
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "py/mpstate.h"
+
+#if MICROPY_NLR_RISCV
+
+#undef nlr_push
+
+// For reference, riscv callee save regs are:
+// s0-s11, ra and sp
+
+__attribute__((naked)) unsigned int nlr_push(nlr_buf_t *nlr) {
+
+ __asm volatile (
+ "sw s0, 0+%0 \n" // store s0 into nlr->regs
+ "sw s1, 4+%0 \n" // store s1 into nlr->regs
+ "sw s2, 8+%0 \n" // store s2 into nlr->regs
+ "sw s3, 12+%0 \n" // store s3 into nlr->regs
+ "sw s4, 16+%0 \n" // store s4 into nlr->regs
+ "sw s5, 20+%0 \n" // store s5 into nlr->regs
+ "sw s6, 24+%0 \n" // store s6 into nlr->regs
+ "sw s7, 28+%0 \n" // store s7 into nlr->regs
+ "sw s8, 32+%0 \n" // store s8 into nlr->regs
+ "sw s9, 36+%0 \n" // store s9 into nlr->regs
+ "sw s10, 40+%0 \n" // store s10 into nlr->regs
+ "sw s11, 44+%0 \n" // store s11 into nlr->regs
+ "sw ra, 48+%0 \n" // store ra into nlr->regs
+ "sw sp, 52+%0 \n" // store sp into nlr->regs
+ "tail nlr_push_tail \n" // do the rest in C
+ : "=o" (nlr->regs)
+ );
+}
+
+NORETURN void nlr_jump(void *val) {
+ MP_NLR_JUMP_HEAD(val, top)
+
+ /* WARNING: if the above macro grows to call a function
+ * (that returns) after loading top, the compiler might
+ * decide to stash top in an s-register and the assembly
+ * below will break.
+ */
+ __asm volatile (
+ "lw s0, 0+%0 \n" // load s0 from top->regs
+ "lw s1, 4+%0 \n" // load s1 from top->regs
+ "lw s2, 8+%0 \n" // load s2 from top->regs
+ "lw s3, 12+%0 \n" // load s3 from top->regs
+ "lw s4, 16+%0 \n" // load s4 from top->regs
+ "lw s5, 20+%0 \n" // load s5 from top->regs
+ "lw s6, 24+%0 \n" // load s6 from top->regs
+ "lw s7, 28+%0 \n" // load s7 from top->regs
+ "lw s8, 32+%0 \n" // load s8 from top->regs
+ "lw s9, 36+%0 \n" // load s9 from top->regs
+ "lw s10, 40+%0 \n" // load s10 from top->regs
+ "lw s11, 44+%0 \n" // load s11 from top->regs
+ "lw ra, 48+%0 \n" // load ra from top->regs
+ "lw sp, 52+%0 \n" // load sp from top->regs
+ "li a0, 1 \n" // return 1, non-local return
+ "ret \n" // return
+ :: "o" (top->regs)
+ );
+
+ MP_UNREACHABLE
+}
+
+#endif // MICROPY_NLR_RISCV32
diff --git a/py/py.cmake b/py/py.cmake
index 2b5d437b5..ae94bda53 100644
--- a/py/py.cmake
+++ b/py/py.cmake
@@ -59,6 +59,7 @@ set(MICROPY_SOURCE_PY
${MICROPY_PY_DIR}/nlrx64.c
${MICROPY_PY_DIR}/nlrx86.c
${MICROPY_PY_DIR}/nlrxtensa.c
+ ${MICROPY_PY_DIR}/nlrriscv.c
${MICROPY_PY_DIR}/obj.c
${MICROPY_PY_DIR}/objarray.c
${MICROPY_PY_DIR}/objattrtuple.c
diff --git a/py/py.mk b/py/py.mk
index 59abc8f50..c89253f7d 100644
--- a/py/py.mk
+++ b/py/py.mk
@@ -61,6 +61,7 @@ PY_CORE_O_BASENAME = $(addprefix py/,\
nlrpowerpc.o \
nlrxtensa.o \
nlrsetjmp.o \
+ nlrriscv.o \
malloc.o \
gc.o \
pystack.o \
--
2.32.0
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