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authorChris Zankel <chris@zankel.net>2009-04-21 00:34:15 -0700
committerChris Zankel <chris@zankel.net>2009-05-11 23:40:33 -0700
commit78f3cdfa2ac0aa2b72b3ee7e4b3c3e550230179f (patch)
tree93436cac4fd7937ac298498f3aeddf38bd147ad0 /arch/xtensa/kernel/vmlinux.lds.S
parent866e514d6a584810dc3ae25364f823b890b7d312 (diff)
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/vmlinux.lds.S')
-rw-r--r--arch/xtensa/kernel/vmlinux.lds.S4
1 files changed, 1 insertions, 3 deletions
diff --git a/arch/xtensa/kernel/vmlinux.lds.S b/arch/xtensa/kernel/vmlinux.lds.S
index 5accf51053da..41c159cd872f 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 = .;
}