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linker: Make alignment size for sw_isr_table configurable
sw_isr_table has two entries, an argument and an ISR function. The comment on struct _isr_table_entry in include/sw_isr_table.h says that "This allows a table entry to be loaded [...] with one ldmia instruction, on ARM [...]". Some arch, e.g. SPARC, also has a double word load instruction, "ldd", but the instruct must have address align to double word or 8 bytes. This commit makes the table alignment configurable. It allows each architecture to specify it, if needed. The default value is 0 for no alignment. Signed-off-by: Yasushi SHOJI <email@example.com>
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