/* Copyright (c) 2008 Dmitry Xmelkov All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name of the copyright holders nor the names of contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* bug #21955: pgm_read_xxxx() does not use enhanced LPM instruction $Id$ Idea is to force 'region text is full': pgm_read_word() takes 5 words in case of classic LPM, and takes 2 words with enhanced LPM. */ #ifndef __AVR__ /* There are not sense to check host computer. */ int main () { return 0; } #else #include #include /* avr-gcc 4.1.2, Avr-libc 1.6.1, main() contains only 1 line with pgm_read_word, bytes: MIN_SIZE == 90 --> Fault MIN_SIZE == 100 --> OK So, for 50 lines it would: 100 + 8*49 = 492 for enhanced 100 + 14*49 = 786 for enhanced No use __AVR_HAVE_LPMX__ for preprocessing. */ #if (__AVR_ARCH__ == 2) || (__AVR_ARCH__ == 3) # define MIN_SIZE 940 #else # define MIN_SIZE 640 #endif #define NWORDS ((FLASHEND - _VECTORS_SIZE - MIN_SIZE)/2) void very_big_function (void) { asm volatile ( ".rept (%0)*256 + %1 \n\t" "nop \n\t" ".endr " :: "M" (NWORDS / 256), "M" (NWORDS % 256) ); } int main () { volatile int rslt; int addr = 0; /* 10*4 words with enhanced LPM 10*7 words with classic LPM */ addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; /* 10 */ /* 10*4 words with enhanced LPM 10*7 words with classic LPM */ addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; /* 20 */ /* 10*4 words with enhanced LPM 10*7 words with classic LPM */ addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; /* 30 */ /* 10*4 words with enhanced LPM 10*7 words with classic LPM */ addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; /* 40 */ /* 10*4 words with enhanced LPM 10*7 words with classic LPM */ addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; addr = pgm_read_word (addr) & 0x7FF; /* 50 */ rslt = (int)addr; return 0; } #endif /* __AVR__ */