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linker-tool-gcc: revise for MMU support

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We need to do a few things differently if we are to support
a virtual memory map, i.e. CONFIG_MMU where CONFIG_KERNEL_VM_BASE
is not the same as CONFIG_SRAM_BASE_ADDRESS.

 - All sections must be specified with a VMA and LMA, where
   VMA is the virtual address and LMA is the physical memory
   location.
 - All sections must be specified with ALIGN_WITH_INPUT to
   keep VMAs and LMAs synchronized

To do this, the existing linker macros need some adjustment:

 - GROUP_LINK_IN undefined when CONFIG_KERNEL_VM_BASE is not
   the same as CONFIG_SRAM_BASE_ADDRESS.
 - New macro GROUP_ROM_LINK_IN for text/rodata sections
 - New macro GROUP_NOLOAD_LINK_IN for bss/noinit sections
 - Implicit ALIGN_WITH_INPUT for all sections

GROUP_FOLLOWS_AT is unused anywhere in the kernel for years
now and has been removed.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
This commit is contained in:
Andrew Boie 2021-03-06 17:44:44 -08:00 • committed by Anas Nashif
commit acda9bf9ce
12 changed files with 151 additions and 71 deletions
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2
include/linker/linker-defs.h
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@ -61,7 +61,7 @@
SECTION_PROLOGUE(struct_type##_area,,SUBALIGN(subalign)) \
{ \
Z_LINK_ITERABLE(struct_type); \
} GROUP_LINK_IN(ROMABLE_REGION)
} GROUP_ROM_LINK_IN(RAMABLE_REGION, ROMABLE_REGION)
/* Define an output section which will set up an iterable area
* of equally-sized data structures. For use with Z_STRUCT_SECTION_ITERABLE.