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264 lines
8.1 KiB
C++
264 lines
8.1 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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* 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 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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// 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 char * 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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// Return a count of free memory blocks.
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uint16_t free_memory_is_corrupted(char * const ptr, const uint16_t size) {
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// Find the longest block of test bytes in the given buffer
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uint16_t block_cnt = 0;
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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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const uint16_t 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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}
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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_ECHOLNPAIR("\nLargest free block is ", max_cnt);
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//}
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return block_cnt;
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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(char *ptr, char *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 = (char*)((uint16_t)ptr & 0xFFF0); // Align to 16-byte boundary
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sp = (char*)((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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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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idle();
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}
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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("free_memory_is_corrupted() = ", free_memory_is_corrupted(ptr, size));
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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(char *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) return;
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ptr += 8;
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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_ECHOPAIR("=", hex_byte(ptr[i]));
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SERIAL_EOL; SERIAL_EOL;
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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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char *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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#endif // M100_FREE_MEMORY_WATCHER
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