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28fec61f92
All the memory accesses need to be unsigned char in order to avoid false errors being detected. Two new features are available for developers to call into the M100 functionality to look for data corruption.
329 lines
11 KiB
C++
329 lines
11 KiB
C++
/**
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* Marlin 3D Printer Firmware
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* Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
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*
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* Based on Sprinter and grbl.
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* Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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/**
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* M100 Free Memory Watcher
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*
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* This code watches the free memory block between the bottom of the heap and the top of the stack.
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* This memory block is initialized and watched via the M100 command.
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*
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* M100 I Initializes the free memory block and prints vitals statistics about the area
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*
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* M100 F Identifies how much of the free memory block remains free and unused. It also
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* detects and reports any corruption within the free memory block that may have
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* happened due to errant firmware.
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*
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* M100 D Does a hex display of the free memory block along with a flag for any errant
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* data that does not match the expected value.
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*
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* M100 C x Corrupts x locations within the free memory block. This is useful to check the
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* correctness of the M100 F and M100 D commands.
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*
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* Also, there are two support functions that can be called from a developer's C code.
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*
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* uint16_t check_for_free_memory_corruption(char * const ptr);
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* void M100_dump_free_memory(char *ptr, char *sp);
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*
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* Initial version by Roxy-3D
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*/
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#define M100_FREE_MEMORY_DUMPER // Enable for the `M110 D` Dump sub-command
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#define M100_FREE_MEMORY_CORRUPTOR // Enable for the `M100 C` Corrupt sub-command
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#include "MarlinConfig.h"
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#if ENABLED(M100_FREE_MEMORY_WATCHER)
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#define TEST_BYTE ((uint8_t) 0xE5)
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extern char* __brkval;
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extern size_t __heap_start, __heap_end, __flp;
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extern char __bss_end;
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#include "Marlin.h"
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#include "hex_print_routines.h"
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//
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// Utility functions
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//
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#define END_OF_HEAP() (__brkval ? __brkval : &__bss_end)
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int check_for_free_memory_corruption(char *title);
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// Location of a variable on its stack frame. Returns a value above
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// the stack (once the function returns to the caller).
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char* top_of_stack() {
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char x;
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return &x + 1; // x is pulled on return;
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}
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// Count the number of test bytes at the specified location.
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int16_t count_test_bytes(const uint8_t * const ptr) {
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for (uint16_t i = 0; i < 32000; i++)
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if (ptr[i] != TEST_BYTE)
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return i - 1;
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return -1;
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}
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//
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// M100 sub-commands
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//
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#if ENABLED(M100_FREE_MEMORY_DUMPER)
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/**
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* M100 D
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* Dump the free memory block from __brkval to the stack pointer.
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* malloc() eats memory from the start of the block and the stack grows
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* up from the bottom of the block. Solid test bytes indicate nothing has
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* used that memory yet. There should not be anything but test bytes within
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* the block. If so, it may indicate memory corruption due to a bad pointer.
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* Unexpected bytes are flagged in the right column.
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*/
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void dump_free_memory(uint8_t *ptr, uint8_t *sp) {
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//
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// Start and end the dump on a nice 16 byte boundary
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// (even though the values are not 16-byte aligned).
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//
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ptr = (uint8_t *)((uint16_t)ptr & 0xFFF0); // Align to 16-byte boundary
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sp = (uint8_t *)((uint16_t)sp | 0x000F); // Align sp to the 15th byte (at or above sp)
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// Dump command main loop
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while (ptr < sp) {
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print_hex_word((uint16_t)ptr); // Print the address
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SERIAL_CHAR(':');
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for (uint8_t i = 0; i < 16; i++) { // and 16 data bytes
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if (i == 8) SERIAL_CHAR('-');
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print_hex_byte(ptr[i]);
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SERIAL_CHAR(' ');
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}
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safe_delay(25);
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SERIAL_CHAR('|'); // Point out non test bytes
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for (uint8_t i = 0; i < 16; i++)
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SERIAL_CHAR(ptr[i] == TEST_BYTE ? ' ' : '?');
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SERIAL_EOL;
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ptr += 16;
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safe_delay(25);
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idle();
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}
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}
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void M100_dump_routine( char *title, char *start, char *end) {
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unsigned char c;
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int i;
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//
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// Round the start and end locations to produce full lines of output
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//
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start = (char*) ((uint16_t) start & 0xfff0);
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end = (char*) ((uint16_t) end | 0x000f);
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SERIAL_ECHOLN(title);
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dump_free_memory( start, end );
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}
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#endif // M100_FREE_MEMORY_DUMPER
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/**
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* M100 F
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* Return the number of free bytes in the memory pool,
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* with other vital statistics defining the pool.
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*/
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void free_memory_pool_report(const char * const ptr, const uint16_t size) {
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int16_t max_cnt = -1;
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uint16_t block_cnt = 0;
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char *max_addr = NULL;
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// Find the longest block of test bytes in the buffer
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for (uint16_t i = 0; i < size; i++) {
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char * const addr = ptr + i;
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if (*addr == TEST_BYTE) {
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const uint16_t j = count_test_bytes(addr);
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if (j > 8) {
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SERIAL_ECHOPAIR("Found ", j);
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SERIAL_ECHOLNPAIR(" bytes free at 0x", hex_word((uint16_t)addr));
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if (j > max_cnt) {
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max_cnt = j;
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max_addr = addr;
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}
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i += j;
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block_cnt++;
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}
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}
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}
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if (block_cnt > 1) {
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SERIAL_ECHOLNPGM("\nMemory Corruption detected in free memory area.");
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SERIAL_ECHOPAIR("\nLargest free block is ", max_cnt);
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SERIAL_ECHOLNPAIR(" bytes at 0x", hex_word((uint16_t)max_addr));
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}
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SERIAL_ECHOLNPAIR("check_for_free_memory_corruption() = ", check_for_free_memory_corruption("M100 F "));
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}
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#if ENABLED(M100_FREE_MEMORY_CORRUPTOR)
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/**
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* M100 C<num>
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* Corrupt <num> locations in the free memory pool and report the corrupt addresses.
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* This is useful to check the correctness of the M100 D and the M100 F commands.
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*/
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void corrupt_free_memory(char *ptr, const uint16_t size) {
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if (code_seen('C')) {
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ptr += 8;
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const uint16_t near_top = top_of_stack() - ptr - 250, // -250 to avoid interrupt activity that's altered the stack.
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j = near_top / (size + 1);
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SERIAL_ECHOLNPGM("Corrupting free memory block.\n");
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for (uint16_t i = 1; i <= size; i++) {
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char * const addr = ptr + i * j;
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*addr = i;
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SERIAL_ECHOPAIR("\nCorrupting address: 0x", hex_word((uint16_t)addr));
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}
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SERIAL_EOL;
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}
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}
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#endif // M100_FREE_MEMORY_CORRUPTOR
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/**
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* M100 I
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* Init memory for the M100 tests. (Automatically applied on the first M100.)
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*/
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void init_free_memory(uint8_t *ptr, int16_t size) {
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SERIAL_ECHOLNPGM("Initializing free memory block.\n\n");
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size -= 250; // -250 to avoid interrupt activity that's altered the stack.
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if (size < 0) {
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SERIAL_ECHOLNPGM("Unable to initialize.\n");
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return;
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}
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ptr += 8; // move a few bytes away from the heap just because we don't want
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// to be altering memory that close to it.
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memset(ptr, TEST_BYTE, size);
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SERIAL_ECHO(size);
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SERIAL_ECHOLNPGM(" bytes of memory initialized.\n");
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for (uint16_t i = 0; i < size; i++) {
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if (ptr[i] != TEST_BYTE) {
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SERIAL_ECHOPAIR("? address : 0x", hex_word((uint16_t)ptr + i));
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SERIAL_ECHOLNPAIR("=", hex_byte(ptr[i]));
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}
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}
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}
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/**
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* M100: Free Memory Check
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*/
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void gcode_M100() {
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SERIAL_ECHOPAIR("\n__brkval : 0x", hex_word((uint16_t)__brkval));
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SERIAL_ECHOPAIR("\n__bss_end: 0x", hex_word((uint16_t)&__bss_end));
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uint8_t *ptr = END_OF_HEAP(), *sp = top_of_stack();
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SERIAL_ECHOPAIR("\nstart of free space : 0x", hex_word((uint16_t)ptr));
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SERIAL_ECHOLNPAIR("\nStack Pointer : 0x", hex_word((uint16_t)sp));
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// Always init on the first invocation of M100
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static bool m100_not_initialized = true;
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if (m100_not_initialized || code_seen('I')) {
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m100_not_initialized = false;
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init_free_memory(ptr, sp - ptr);
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}
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#if ENABLED(M100_FREE_MEMORY_DUMPER)
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if (code_seen('D'))
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return dump_free_memory(ptr, sp);
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#endif
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if (code_seen('F'))
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return free_memory_pool_report(ptr, sp - ptr);
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#if ENABLED(M100_FREE_MEMORY_CORRUPTOR)
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if (code_seen('C'))
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return corrupt_free_memory(ptr, code_value_int());
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#endif
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}
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int check_for_free_memory_corruption(char *title) {
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char *sp, *ptr;
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int block_cnt = 0, i, j, n;
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SERIAL_ECHO(title);
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ptr = __brkval ? __brkval : &__bss_end;
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sp = top_of_stack();
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n = sp - ptr;
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SERIAL_ECHOPAIR("\nfmc() n=", n);
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SERIAL_ECHOPAIR("\n&__brkval: 0x", hex_word((uint16_t)&__brkval));
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SERIAL_ECHOPAIR("=0x", hex_word((uint16_t)__brkval));
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SERIAL_ECHOPAIR("\n__bss_end: 0x", hex_word((uint16_t)&__bss_end));
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SERIAL_ECHOPAIR(" sp=", hex_word(sp));
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if (sp < ptr) {
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SERIAL_ECHOPGM(" sp < Heap ");
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// SET_INPUT_PULLUP(63); // if the developer has a switch wired up to their controller board
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// safe_delay(5); // this code can be enabled to pause the display as soon as the
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// while ( READ(63)) // malfunction is detected. It is currently defaulting to a switch
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// idle(); // being on pin-63 which is unassigend and available on most controller
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// safe_delay(20); // boards.
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// while ( !READ(63))
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// idle();
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safe_delay(20);
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M100_dump_routine( " Memory corruption detected with sp<Heap\n", (char *)0x1b80, 0x21ff );
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}
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// Scan through the range looking for the biggest block of 0xE5's we can find
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for (i = 0; i < n; i++) {
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if (*(ptr + i) == (char)0xe5) {
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j = count_test_bytes(ptr + i);
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if (j > 8) {
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// SERIAL_ECHOPAIR("Found ", j);
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// SERIAL_ECHOLNPAIR(" bytes free at 0x", hex_word((uint16_t)(ptr + i)));
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i += j;
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block_cnt++;
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SERIAL_ECHOPAIR(" (", block_cnt);
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SERIAL_ECHOPAIR(") found=", j);
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SERIAL_ECHOPGM(" ");
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}
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}
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}
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SERIAL_ECHOPAIR(" block_found=", block_cnt);
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if ((block_cnt!=1) || (__brkval != 0x0000))
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SERIAL_ECHOLNPGM("\nMemory Corruption detected in free memory area.");
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if ((block_cnt==0)) // Make sure the special case of no free blocks shows up as an
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block_cnt = -1; // error to the calling code!
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if (block_cnt==1) {
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SERIAL_ECHOPGM(" return=0\n"); // if the block_cnt is 1, nothing has broken up the free memory
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return 0; // area and it is appropriate to say 'no corruption'.
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}
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SERIAL_ECHOPGM(" return=true\n");
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return block_cnt;
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}
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#endif // M100_FREE_MEMORY_WATCHER
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