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authorAlessio Igor Bogani <abogani@kernel.org>2011-04-14 14:59:39 +0200
committerRusty Russell <rusty@rustcorp.com.au>2011-05-19 16:55:27 +0930
commitf02e8a6596b7dc9b2171f7ff5654039ef0950cdc (patch)
tree7e306a718415a53aea737c434f33eb36f3e53abc
parentde4d8d53465483168d6a627d409ee2d09d8e3308 (diff)
downloadlwn-f02e8a6596b7dc9b2171f7ff5654039ef0950cdc.tar.gz
lwn-f02e8a6596b7dc9b2171f7ff5654039ef0950cdc.zip
module: Sort exported symbols
This patch places every exported symbol in its own section (i.e. "___ksymtab+printk"). Thus the linker will use its SORT() directive to sort and finally merge all symbol in the right and final section (i.e. "__ksymtab"). The symbol prefixed archs use an underscore as prefix for symbols. To avoid collision we use a different character to create the temporary section names. This work was supported by a hardware donation from the CE Linux Forum. Signed-off-by: Alessio Igor Bogani <abogani@kernel.org> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (folded in '+' fixup) Tested-by: Dirk Behme <dirk.behme@googlemail.com>
-rw-r--r--include/asm-generic/vmlinux.lds.h20
-rw-r--r--include/linux/module.h4
-rw-r--r--scripts/module-common.lds11
3 files changed, 23 insertions, 12 deletions
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index bd297a20ab98..b27445e00b6c 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -274,70 +274,70 @@
/* Kernel symbol table: Normal symbols */ \
__ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \
VMLINUX_SYMBOL(__start___ksymtab) = .; \
- *(__ksymtab) \
+ *(SORT(___ksymtab+*)) \
VMLINUX_SYMBOL(__stop___ksymtab) = .; \
} \
\
/* Kernel symbol table: GPL-only symbols */ \
__ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \
VMLINUX_SYMBOL(__start___ksymtab_gpl) = .; \
- *(__ksymtab_gpl) \
+ *(SORT(___ksymtab_gpl+*)) \
VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .; \
} \
\
/* Kernel symbol table: Normal unused symbols */ \
__ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \
VMLINUX_SYMBOL(__start___ksymtab_unused) = .; \
- *(__ksymtab_unused) \
+ *(SORT(___ksymtab_unused+*)) \
VMLINUX_SYMBOL(__stop___ksymtab_unused) = .; \
} \
\
/* Kernel symbol table: GPL-only unused symbols */ \
__ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .; \
- *(__ksymtab_unused_gpl) \
+ *(SORT(___ksymtab_unused_gpl+*)) \
VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .; \
} \
\
/* Kernel symbol table: GPL-future-only symbols */ \
__ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .; \
- *(__ksymtab_gpl_future) \
+ *(SORT(___ksymtab_gpl_future+*)) \
VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .; \
} \
\
/* Kernel symbol table: Normal symbols */ \
__kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \
VMLINUX_SYMBOL(__start___kcrctab) = .; \
- *(__kcrctab) \
+ *(SORT(___kcrctab+*)) \
VMLINUX_SYMBOL(__stop___kcrctab) = .; \
} \
\
/* Kernel symbol table: GPL-only symbols */ \
__kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \
VMLINUX_SYMBOL(__start___kcrctab_gpl) = .; \
- *(__kcrctab_gpl) \
+ *(SORT(___kcrctab_gpl+*)) \
VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .; \
} \
\
/* Kernel symbol table: Normal unused symbols */ \
__kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \
VMLINUX_SYMBOL(__start___kcrctab_unused) = .; \
- *(__kcrctab_unused) \
+ *(SORT(___kcrctab_unused+*)) \
VMLINUX_SYMBOL(__stop___kcrctab_unused) = .; \
} \
\
/* Kernel symbol table: GPL-only unused symbols */ \
__kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .; \
- *(__kcrctab_unused_gpl) \
+ *(SORT(___kcrctab_unused_gpl+*)) \
VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .; \
} \
\
/* Kernel symbol table: GPL-future-only symbols */ \
__kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .; \
- *(__kcrctab_gpl_future) \
+ *(SORT(___kcrctab_gpl_future+*)) \
VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .; \
} \
\
diff --git a/include/linux/module.h b/include/linux/module.h
index 49f4ad0ddec2..d9ca2d5dc6d0 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -224,7 +224,7 @@ struct module_use {
extern void *__crc_##sym __attribute__((weak)); \
static const unsigned long __kcrctab_##sym \
__used \
- __attribute__((section("__kcrctab" sec), unused)) \
+ __attribute__((section("___kcrctab" sec "+" #sym), unused)) \
= (unsigned long) &__crc_##sym;
#else
#define __CRC_SYMBOL(sym, sec)
@@ -239,7 +239,7 @@ struct module_use {
= MODULE_SYMBOL_PREFIX #sym; \
static const struct kernel_symbol __ksymtab_##sym \
__used \
- __attribute__((section("__ksymtab" sec), unused)) \
+ __attribute__((section("___ksymtab" sec "+" #sym), unused)) \
= { (unsigned long)&sym, __kstrtab_##sym }
#define EXPORT_SYMBOL(sym) \
diff --git a/scripts/module-common.lds b/scripts/module-common.lds
index 47a1f9ae0ede..0865b3e752be 100644
--- a/scripts/module-common.lds
+++ b/scripts/module-common.lds
@@ -5,4 +5,15 @@
*/
SECTIONS {
/DISCARD/ : { *(.discard) }
+
+ __ksymtab : { *(SORT(___ksymtab+*)) }
+ __ksymtab_gpl : { *(SORT(___ksymtab_gpl+*)) }
+ __ksymtab_unused : { *(SORT(___ksymtab_unused+*)) }
+ __ksymtab_unused_gpl : { *(SORT(___ksymtab_unused_gpl+*)) }
+ __ksymtab_gpl_future : { *(SORT(___ksymtab_gpl_future+*)) }
+ __kcrctab : { *(SORT(___kcrctab+*)) }
+ __kcrctab_gpl : { *(SORT(___kcrctab_gpl+*)) }
+ __kcrctab_unused : { *(SORT(___kcrctab_unused+*)) }
+ __kcrctab_unused_gpl : { *(SORT(___kcrctab_unused_gpl+*)) }
+ __kcrctab_gpl_future : { *(SORT(___kcrctab_gpl_future+*)) }
}