Hi Guys, I am checking in the attached patch to add support for persistent data to the MSP430 port. Persistent data retains its current value across processor resets (because it is held in flash), so its value must be set once - when the program is loaded - and then never changed by the runtime support code again.
The patch also includes some documentation for this new feature and a
new testcase to make sure that it works. An associated libgloss patch
is needed in order to update the linker scripts involved, and I will
be applying that patch shortly.
Tested with no regressions on an msp430-elf toolchain.
Cheers
Nick
gcc/ChangeLog
2015-10-06 Nick Clifton <ni...@redhat.com>
* config/msp430/msp430.c (ATTR_NOINIT): New constant.
(ATTR_PERSIST): New constant.
(msp430_data_attr): New function - verifies an attribute that only
applies to variables.
(msp430_attributes): Add noinit and persistent attributes.
(noinit_section): New variable.
(presis_section): New variable.
(TARGET_ASM_INIT_SECTIONS): Define.
(msp430_init_sections): New function - initialises the noinit and
persist section variables.
(msp430_select_section): Add support for noinit and persist
attributes.
(msp430_section_type_flags): Likewise.
* doc/extend.texi: Document the reent, critical, wakeup, noinit
and persistent attributes.
gcc/testsuite/ChangeLog
2015-10-06 Nick Clifton <ni...@redhat.com>
* gcc.target/msp430: New directory.
* gcc.target/msp430/msp430.exp: New file. Runs MSP430 specific
tests.
* gcc.target/msp430/data-attributes.c: New file. Checks the
noinit and persistent data attributes.
msp430.persistent.patch.2
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