Richard Wackerbarth
10 years ago
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#define M99_FREE_MEMORY_DUMPER // Comment out to remove Dump sub-command
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#define M99_FREE_MEMORY_CORRUPTOR // Comment out to remove Corrupt sub-command
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// M99 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 M99 command.
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//
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// M99 I Initializes the free memory block and prints vitals statistics about the area
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// M99 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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// M99 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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// M99 C x Corrupts x locations within the free memory block. This is useful to check the
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// correctness of the M99 F and M99 D commands.
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//
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// Initial version by Roxy-3DPrintBoard
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//
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//
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#include "Marlin.h"
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#ifdef M99_FREE_MEMORY_WATCHER
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extern void *__brkval;
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extern size_t __heap_start, __heap_end, __flp;
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//
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// Declare all the functions we need from Marlin_Main.cpp to do the work!
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//
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float code_value();
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long code_value_long();
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bool code_seen(char );
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void serial_echopair_P(const char *, float );
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void serial_echopair_P(const char *, double );
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void serial_echopair_P(const char *, unsigned long );
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void serial_echopair_P(const char *, int );
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void serial_echopair_P(const char *, long );
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//
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// Utility functions used by M99 to get its work done.
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//
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unsigned char *top_of_stack();
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void prt_hex_nibble( unsigned int );
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void prt_hex_byte(unsigned int );
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void prt_hex_word(unsigned int );
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int how_many_E5s_are_here( unsigned char *);
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void m99_code()
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{
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static int m99_not_initialized=1;
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unsigned char *sp, *ptr;
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int i, j, n;
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//
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// M99 D dumps 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 0xE5's indicate nothing has
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// used that memory yet. There should not be anything but 0xE5's within
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// the block of 0xE5's. If there is, that would indicate memory corruption
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// probably caused by bad pointers. Any unexpected values will be flagged in
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// the right hand column to help spotting them.
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//
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#ifdef M99_FREE_MEMORY_DUMPER // Comment out to remove Dump sub-command
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if ( code_seen('D') ) {
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ptr = (unsigned char *) __brkval;
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//
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// We want to start and end the dump on a nice 16 byte boundry even though
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// the values we are using are not 16 byte aligned.
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//
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SERIAL_ECHOPGM("\n__brkval : ");
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prt_hex_word( (unsigned int) ptr );
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ptr = (unsigned char *) ((unsigned long) ptr & 0xfff0);
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sp = top_of_stack();
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SERIAL_ECHOPGM("\nStack Pointer : ");
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prt_hex_word( (unsigned int) sp );
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SERIAL_ECHOPGM("\n");
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sp = (unsigned char *) ((unsigned long) sp | 0x000f);
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n = sp - ptr;
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//
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// This is the main loop of the Dump command.
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//
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while ( ptr < sp ) {
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prt_hex_word( (unsigned int) ptr); // Print the address
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SERIAL_ECHOPGM(":");
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for(i=0; i<16; i++) { // and 16 data bytes
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prt_hex_byte( *(ptr+i));
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SERIAL_ECHOPGM(" ");
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delay(2);
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}
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SERIAL_ECHO("|"); // now show where non 0xE5's are
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for(i=0; i<16; i++) {
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delay(2);
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if ( *(ptr+i)==0xe5)
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SERIAL_ECHOPGM(" ");
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else
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SERIAL_ECHOPGM("?");
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}
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SERIAL_ECHO("\n");
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ptr += 16;
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delay(2);
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}
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SERIAL_ECHOLNPGM("Done.\n");
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return;
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}
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#endif
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//
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// M99 F requests the code to return the number of free bytes in the memory pool along with
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// other vital statistics that define the memory pool.
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//
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if ( code_seen('F') ) {
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int max_addr = (int) __brkval;
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int max_cnt = 0;
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int block_cnt = 0;
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ptr = (unsigned char *) __brkval;
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sp = top_of_stack();
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n = sp - ptr;
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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) == (unsigned char) 0xe5) {
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j = how_many_E5s_are_here( (unsigned char *) ptr+i );
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if ( j>8) {
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SERIAL_ECHOPAIR("Found ", j );
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SERIAL_ECHOPGM(" bytes free at 0x");
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prt_hex_word( (int) ptr+i );
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SERIAL_ECHOPGM("\n");
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i += j;
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block_cnt++;
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}
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if ( j>max_cnt) { // We don't do anything with this information yet
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max_cnt = j; // but we do know where the biggest free memory block is.
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max_addr = (int) ptr+i;
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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.\n");
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SERIAL_ECHO("\nDone.\n");
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return;
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}
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//
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// M99 C x Corrupts x locations in the free memory pool and reports the locations of the corruption.
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// This is useful to check the correctness of the M99 D and the M99 F commands.
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//
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#ifdef M99_FREE_MEMORY_CORRUPTOR
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if ( code_seen('C') ) {
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int x; // x gets the # of locations to corrupt within the memory pool
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x = code_value();
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SERIAL_ECHOLNPGM("Corrupting free memory block.\n");
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ptr = (unsigned char *) __brkval;
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SERIAL_ECHOPAIR("\n__brkval : ",(long) ptr );
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ptr += 8;
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sp = top_of_stack();
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SERIAL_ECHOPAIR("\nStack Pointer : ",(long) sp );
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SERIAL_ECHOLNPGM("\n");
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n = sp - ptr - 64; // -64 just to keep us from finding interrupt activity that
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// has altered the stack.
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j = n / (x+1);
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for(i=1; i<=x; i++) {
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*(ptr+(i*j)) = i;
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SERIAL_ECHO("\nCorrupting address: 0x");
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prt_hex_word( (unsigned int) (ptr+(i*j)) );
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}
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SERIAL_ECHOLNPGM("\n");
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return;
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}
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#endif
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//
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// M99 I Initializes the free memory pool so it can be watched and prints vital
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// statistics that define the free memory pool.
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//
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if (m99_not_initialized || code_seen('I') ) { // If no sub-command is specified, the first time
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SERIAL_ECHOLNPGM("Initializing free memory block.\n"); // this happens, it will Initialize.
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ptr = (unsigned char *) __brkval; // Repeated M99 with no sub-command will not destroy the
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SERIAL_ECHOPAIR("\n__brkval : ",(long) ptr ); // state of the initialized free memory pool.
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ptr += 8;
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sp = top_of_stack();
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SERIAL_ECHOPAIR("\nStack Pointer : ",(long) sp );
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SERIAL_ECHOLNPGM("\n");
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n = sp - ptr - 64; // -64 just to keep us from finding interrupt activity that
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// has altered the stack.
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SERIAL_ECHO( n );
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SERIAL_ECHOLNPGM(" bytes of memory initialized.\n");
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for(i=0; i<n; i++)
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*(ptr+i) = (unsigned char) 0xe5;
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for(i=0; i<n; i++) {
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if ( *(ptr+i) != (unsigned char) 0xe5 ) {
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SERIAL_ECHOPAIR("? address : ", (unsigned long) ptr+i );
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SERIAL_ECHOPAIR("=", *(ptr+i) );
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SERIAL_ECHOLNPGM("\n");
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}
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}
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m99_not_initialized = 0;
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SERIAL_ECHOLNPGM("Done.\n");
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return;
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}
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return;
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}
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// top_of_stack() returns the location of a variable on its stack frame. The value returned is above
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// the stack once the function returns to the caller.
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unsigned char *top_of_stack() {
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unsigned char x;
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return &x;
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}
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//
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// 3 support routines to print hex numbers. We can print a nibble, byte and word
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//
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void prt_hex_nibble( unsigned int n )
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{
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if ( n <= 9 )
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SERIAL_ECHO(n);
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else
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SERIAL_ECHO( (char) ('A'+n-10) );
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delay(2);
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}
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void prt_hex_byte(unsigned int b)
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{
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prt_hex_nibble( ( b & 0xf0 ) >> 4 );
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prt_hex_nibble( b & 0x0f );
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}
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void prt_hex_word(unsigned int w)
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{
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prt_hex_byte( ( w & 0xff00 ) >> 8 );
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prt_hex_byte( w & 0x0ff );
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}
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// how_many_E5s_are_here() is a utility function to easily find out how many 0xE5's are
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// at the specified location. Having this logic as a function simplifies the search code.
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//
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int how_many_E5s_are_here( unsigned char *p)
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{
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int n;
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for(n=0; n<32000; n++) {
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if ( *(p+n) != (unsigned char) 0xe5)
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return n-1;
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}
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return -1;
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}
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#endif
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