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isr_tables: Simplify how the spurious irq function address is found

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Instead of finding the address of the spurious irq function in the
intList section we now rely on the linker to find the address in the
_irq_spurious symbol.

This is a migration from using code generation to using the C language
which we in the general case we should aways strive towards.

In this specific case it makes the generated code 'irq_tables.c'
easier to read as we replace magic numbers with the &_irq_spurious
token.

Also, the path through the build system that _irq_spurious makes is
much shorter, so it is much easier for a user to understand how it is
used.

Signed-off-by: Sebastian Bøe <sebastian.boe@nordicsemi.no>
This commit is contained in:
Sebastian Bøe 2018-05-09 12:00:24 +02:00 • committed by Andrew Boie
commit 8f321b48ac
3 changed files with 26 additions and 20 deletions
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9
include/linker/intlist.ld
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@ -10,17 +10,16 @@
* What we create here is a data structure:
*
* struct {
* void *spurious_irq_handler;
* void *sw_irq_handler;
* u32_t num_isrs;
* u32_t num_vectors;
* struct _isr_list isrs[]; <- of size num_isrs
* }
*
* Which indicates the memory address of the spurious IRQ handler and the
* number of isrs that were defined, the total number of IRQ lines in the
* system, followed by an appropriate number of instances of
* struct _isr_list. See include/sw_isr_table.h
* Which indicates the memory address of the number of isrs that were
* defined, the total number of IRQ lines in the system, followed by
* an appropriate number of instances of struct _isr_list. See
* include/sw_isr_table.h
*
* You will need to declare a bogus memory region for IDT_LIST. It doesn't
* matter where this region goes as it is stripped from the final ELF image.