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authorjaseg <git@jaseg.de>2020-11-26 12:38:52 +0100
committerjaseg <git@jaseg.de>2020-11-26 12:38:52 +0100
commit451904a0c5fae3bd28d35c7128df3a9db1a04b26 (patch)
treeb406c126b08032219894db3ff16a2ccf87c667d6 /prototype/fw
parente282a5eb373ec4b44d36f580fe642483f2e52794 (diff)
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Add CRC32 implementation
Diffstat (limited to 'prototype/fw')
-rw-r--r--prototype/fw/Makefile14
-rw-r--r--prototype/fw/src/crc32.c35
-rw-r--r--prototype/fw/src/crc32.h12
-rw-r--r--prototype/fw/src/crc32_test.c20
-rw-r--r--prototype/fw/test/crc32_ref.py45
m---------prototype/fw/upstream/PyCortexMDebug0
6 files changed, 124 insertions, 2 deletions
diff --git a/prototype/fw/Makefile b/prototype/fw/Makefile
index db7952b..3fbd029 100644
--- a/prototype/fw/Makefile
+++ b/prototype/fw/Makefile
@@ -23,9 +23,9 @@ DEBUG ?= 1
OPT ?= 0
BUILDDIR ?= build
-BINARY := safetyreset.elf
+BINARY := rotohsm_proto_rotor.elf
LDSCRIPT := generic_stm32.ld
-DEVICE := STM32F302C8
+DEVICE := STM32F302CB
########################################################################################################################
@@ -53,6 +53,7 @@ C_SOURCES += $(MUSL_SOURCES)
PREFIX ?= arm-none-eabi-
+HOSTCC := gcc
CC := $(PREFIX)gcc
CPP := $(PREFIX)cpp
CXX := $(PREFIX)g++
@@ -102,6 +103,8 @@ COMMON_CFLAGS += -O$(OPT) -std=gnu11 -g
COMMON_CFLAGS += $(DEVICE_DEFINES)
COMMON_CFLAGS += -DDEBUG=$(DEBUG)
+HOST_CFLAGS += $(COMMON_CFLAGS)
+
# for musl
CFLAGS += -Dhidden=
@@ -193,6 +196,13 @@ $(BUILDDIR)/%.o: %.s
mkdir -p $(@D)
$(CC) $(COMMON_CFLAGS) $(CFLAGS) $(EXT_CFLAGS) -o $@ -c $<
+$(BUILDDIR)/crc32_test: src/crc32_test.c src/crc32.c
+ $(HOSTCC) $(HOST_CFLAGS) -o $@ $^
+
+.PHONY: run_tests
+run_tests: $(BUILDDIR)/crc32_test
+ $(PYTHON3) -m unittest test.crc32_ref
+
venv:
test -d venv || python3 -m venv --system-site-packages venv
source venv/bin/activate && pip install cxxfilt pyelftools libarchive matplotlib
diff --git a/prototype/fw/src/crc32.c b/prototype/fw/src/crc32.c
new file mode 100644
index 0000000..4b03fbb
--- /dev/null
+++ b/prototype/fw/src/crc32.c
@@ -0,0 +1,35 @@
+#include "crc32.h"
+#include <unistd.h>
+
+/* Polynomial: 0xEDB88320 */
+
+/* python3:
+ * In [26]: apply = lambda st: ((st>>1) ^ 0xEDB88320) if (st & 1) else (st>>1)
+ * In [27]: print(',\n'.join([ '0x{:08x}'.format(apply(apply(apply(apply(x))))) for x in range(16) ]))
+ */
+uint32_t crc32_table[16] = {
+ 0x00000000,
+ 0x1db71064,
+ 0x3b6e20c8,
+ 0x26d930ac,
+ 0x76dc4190,
+ 0x6b6b51f4,
+ 0x4db26158,
+ 0x5005713c,
+ 0xedb88320,
+ 0xf00f9344,
+ 0xd6d6a3e8,
+ 0xcb61b38c,
+ 0x9b64c2b0,
+ 0x86d3d2d4,
+ 0xa00ae278,
+ 0xbdbdf21c
+};
+
+crc32_t crc32_update(crc32_t state, uint8_t c)
+{
+ state ^= c;
+ state = (state>>4) ^ crc32_table[state&0xf];
+ state = (state>>4) ^ crc32_table[state&0xf];
+ return state;
+}
diff --git a/prototype/fw/src/crc32.h b/prototype/fw/src/crc32.h
new file mode 100644
index 0000000..7a3a729
--- /dev/null
+++ b/prototype/fw/src/crc32.h
@@ -0,0 +1,12 @@
+#ifndef __CRC_32_H__
+#define __CRC_32_H__
+
+#include <stdint.h>
+
+typedef uint32_t crc32_t;
+
+inline static uint32_t crc32_reset() { return ~0; }
+uint32_t crc32_update(uint32_t old_state, uint8_t c);
+inline static uint32_t crc32_finalize(uint32_t state) { return ~state; }
+
+#endif /* __CRC_32_H__ */
diff --git a/prototype/fw/src/crc32_test.c b/prototype/fw/src/crc32_test.c
new file mode 100644
index 0000000..e23bb37
--- /dev/null
+++ b/prototype/fw/src/crc32_test.c
@@ -0,0 +1,20 @@
+
+#include <stdio.h>
+
+#include "crc32.h"
+
+int main(void) {
+ crc32_t state = crc32_reset();
+
+ do {
+ char c;
+ if (fread(&c, 1, 1, stdin) != 1)
+ break;
+
+ state = crc32_update(state, (uint8_t)c);
+ } while(23);
+
+ state = crc32_finalize(state);
+ printf("%08x\n", state);
+ return 0;
+}
diff --git a/prototype/fw/test/crc32_ref.py b/prototype/fw/test/crc32_ref.py
new file mode 100644
index 0000000..7ac0582
--- /dev/null
+++ b/prototype/fw/test/crc32_ref.py
@@ -0,0 +1,45 @@
+#!/usr/bin/env python3
+
+import subprocess
+import zlib
+import os
+import itertools
+import unittest
+
+INTERESTING = bytes([0x00, 0x42, 0xff, 0x01, 0x80])
+
+class RefdataTest(unittest.TestCase):
+ def run_test(self, test_data):
+ ref_val = zlib.crc32(test_data)
+
+ binary = os.environ.get('CRC32_TEST_BINARY', 'build/crc32_test')
+
+ output = subprocess.check_output(binary, input=test_data)
+ test_val = int(output, 16) & 0xffffffff
+
+ self.assertEqual(test_val, ref_val, f'mismatched results checking input {test_data}')
+
+ def test_empty(self):
+ self.run_test(b'')
+
+ def test_one_byte(self):
+ for x in range(256):
+ self.run_test(bytes([x]))
+
+ def test_two_byte(self):
+ for x, y in itertools.product(INTERESTING, repeat=2):
+ self.run_test(bytes([x, y]))
+
+ def test_three_bytes(self):
+ for x, y, z in itertools.product(INTERESTING, repeat=3):
+ self.run_test(bytes([x, y, z]))
+
+ def test_four_bytes(self):
+ for w, x, y, z in itertools.product(INTERESTING, repeat=4):
+ self.run_test(bytes([w, x, y, z]))
+
+ def test_random_strings(self):
+ for length in range(3, 24):
+ for i in range(20):
+ self.run_test(os.urandom(length))
+
diff --git a/prototype/fw/upstream/PyCortexMDebug b/prototype/fw/upstream/PyCortexMDebug
new file mode 160000
+Subproject 77e9717a0e7c5b44214bdf70fbddf376cf2e8a7