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>
__tbss_start should be a virtual address.
__tdata_start should also be a virtual address, unless we're
using XIP in which case each thread should copy its thread-
local data out of flash.
Fixes issues with a kernel linked at a virtual address.
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This lets the linker tell us what kind of alignment is required
for both tdata and tbss data when copying them into stack.
If they are not aligned as expected by the toolchain, generated
code would be accessing incorrect location for thread variables.
Fixes#32015
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
XCC Clang doesn't emit load address when a section
is empty, resulting in __tdata_start not being
defined. So put a #ifdef guard for the thread local
storage linker script to avoid this issue.
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
This adds the tdata and tbss sections required for thread local
storage. They are in ROM area as these sections are not to be
directly accessed, but copied to thread local storage area at
thread creation.
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
