[avr-gcc-list] Save RAMPZ register in interrupt handler routines

[Anatoly Sokolov]

Hello.

  For FLASH memory access for 128KB avr-libc have pgm_read_*_far macros. 
These macros modify RAMPZ register and is non-reenterable. Using these 
macros in main loop/interrupts code can cause collisions of access to FLASH 
memory.

  For solving of this problem I offer save RAMPZ register in interrupt 
handler routines for 128KB devices ('avr31' and 'avr51' architectures). The 
'-mno-save-rampz' switch restore old behaviour.

Patch attached.

Anatoly. 


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end