URL:
<http://savannah.nongnu.org/bugs/?45701>
Summary: redundant stack initialization in crt1.o
Project: AVR C Runtime Library
Submitted by: None
Submitted on: Wed 05 Aug 2015 04:03:13 PM UTC
Category: Library
Severity: 3 - Normal
Priority: 5 - Normal
Item Group: Startup code
Status: None
Percent Complete: 0%
Assigned to: None
Originator Email: ralphdoncas...@gmail.com
Open/Closed: Open
Discussion Lock: Any
Release: 1.8.0
Fixed Release: None
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Details:
It appears crt1.o always initializes the stack and clears SREG, even for
modern AVRs that don't require it.
While it is necessary for old AVRs like the mega8, since SPH/SPL is
initialized to 0 on reset (datasheet s. 7.5.1), on the tinyx5, tinyx4,
mega48/88/168/328, and many others SPH/SPL is initialized to RAMEND upon
reset. See, for example, s. 4.8.1 of the tiny84a datasheet.
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