mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-28 15:13:55 +08:00
78f3cdfa2a
Fix resembles implementation from Marc Gauthier and Piet Denaly:
In the Xtensa architecture, assembly generates literals which must always
precede the code (the L32R instruction that loads them only uses negative
PC-relative offsets). For any *.text section, literals are placed in a
corresponding *.literal section. The linker script (vmlinux.lds) must
place these in the correct order. It must also combine them, when the
*.text section can be larger than L32R's 256 kB range.
For example, this doesn't work: *(.literal) *(.text) because L32R
instructions at the end of .text can't reach the literals.
The linker can solve this if they are combined in parentheses, like this:
*(.literal .text)
because it is now allowed mix literals in .text to bring them in range.
None of this is done by standard vmlinux.lds.h macros such as TEXT_TEXT
and INIT_TEXT. To avoid replicating the logic of that header file, we
instead post-process the generated linker script to convert *(xxx.text)
to *(xxx.literal xxx.text) for the following text sections:
.text .ref.text .*init.text .*exit.text .text.*
using a sed script. To do this we must override the default rule for
vmlinux.lds (see scripts/Makefile.build and the top-level Makefile)
to insert this extra step.
Signed-off-by: Marc Gauthier <marc@tensilica.com>
Signed-off-by: Pete Delaney <piet@tensilica.com>
Signed-off-by: Chris Zankel <chris@zankel.net>
34 lines
1.2 KiB
Makefile
34 lines
1.2 KiB
Makefile
#
|
|
# Makefile for the Linux/Xtensa kernel.
|
|
#
|
|
|
|
extra-y := head.o vmlinux.lds
|
|
|
|
obj-y := align.o entry.o irq.o coprocessor.o process.o ptrace.o \
|
|
setup.o signal.o syscall.o time.o traps.o vectors.o platform.o \
|
|
pci-dma.o init_task.o io.o
|
|
|
|
obj-$(CONFIG_KGDB) += xtensa-stub.o
|
|
obj-$(CONFIG_PCI) += pci.o
|
|
obj-$(CONFIG_MODULES) += xtensa_ksyms.o module.o
|
|
|
|
# In the Xtensa architecture, assembly generates literals which must always
|
|
# precede the L32R instruction with a relative offset less than 256 kB.
|
|
# Therefore, the .text and .literal section must be combined in parenthesis
|
|
# in the linker script, such as: *(.literal .text).
|
|
#
|
|
# We need to post-process the generated vmlinux.lds scripts to convert
|
|
# *(xxx.text) to *(xxx.literal xxx.text) for the following text sections:
|
|
# .text .ref.text .*init.text .*exit.text .text.*
|
|
#
|
|
# Replicate rules in scripts/Makefile.build
|
|
|
|
sed-y = -e 's/(\(\.[a-z]*it\|\.ref\|\)\.text)/(\1.literal \1.text)/g' \
|
|
-e 's/(\(\.text\.[a-z]*\))/(\1.literal \1)/g'
|
|
|
|
quiet_cmd__cpp_lds_S = LDS $@
|
|
cmd__cpp_lds_S = $(CPP) $(cpp_flags) -D__ASSEMBLY__ $< | sed $(sed-y) >$@
|
|
|
|
$(obj)/vmlinux.lds: $(src)/vmlinux.lds.S FORCE
|
|
$(call if_changed_dep,_cpp_lds_S)
|