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author | Chris Zankel <chris@zankel.net> | 2009-04-21 07:34:15 (GMT) |
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committer | Chris Zankel <chris@zankel.net> | 2009-05-12 06:40:33 (GMT) |
commit | 78f3cdfa2ac0aa2b72b3ee7e4b3c3e550230179f (patch) | |
tree | 93436cac4fd7937ac298498f3aeddf38bd147ad0 /arch/xtensa/kernel | |
parent | 866e514d6a584810dc3ae25364f823b890b7d312 (diff) | |
download | linux-fsl-qoriq-78f3cdfa2ac0aa2b72b3ee7e4b3c3e550230179f.tar.xz |
xtensa: Fix linker script to include .literal sections
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>
Diffstat (limited to 'arch/xtensa/kernel')
-rw-r--r-- | arch/xtensa/kernel/Makefile | 21 | ||||
-rw-r--r-- | arch/xtensa/kernel/vmlinux.lds.S | 4 |
2 files changed, 19 insertions, 6 deletions
diff --git a/arch/xtensa/kernel/Makefile b/arch/xtensa/kernel/Makefile index 7419dbc..fe3186de 100644 --- a/arch/xtensa/kernel/Makefile +++ b/arch/xtensa/kernel/Makefile @@ -4,15 +4,30 @@ 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 -## windowspill.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) diff --git a/arch/xtensa/kernel/vmlinux.lds.S b/arch/xtensa/kernel/vmlinux.lds.S index 5accf51..41c159c 100644 --- a/arch/xtensa/kernel/vmlinux.lds.S +++ b/arch/xtensa/kernel/vmlinux.lds.S @@ -87,7 +87,7 @@ SECTIONS { /* The HEAD_TEXT section must be the first section! */ HEAD_TEXT - *(.literal .text) + TEXT_TEXT VMLINUX_SYMBOL(__sched_text_start) = .; *(.sched.literal .sched.text) VMLINUX_SYMBOL(__sched_text_end) = .; @@ -139,8 +139,6 @@ SECTIONS __init_begin = .; .init.text : { _sinittext = .; - *(.init.literal) *(.cpuinit.literal) - *(.devinit.literal) *(.meminit.literal) INIT_TEXT _einittext = .; } |