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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>
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de4d8d5346
commit
f02e8a6596
3 changed files with 23 additions and 12 deletions
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@ -274,70 +274,70 @@
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/* Kernel symbol table: Normal symbols */ \
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__ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \
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VMLINUX_SYMBOL(__start___ksymtab) = .; \
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*(__ksymtab) \
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*(SORT(___ksymtab+*)) \
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VMLINUX_SYMBOL(__stop___ksymtab) = .; \
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} \
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\
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/* Kernel symbol table: GPL-only symbols */ \
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__ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \
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VMLINUX_SYMBOL(__start___ksymtab_gpl) = .; \
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*(__ksymtab_gpl) \
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*(SORT(___ksymtab_gpl+*)) \
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VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .; \
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} \
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\
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/* Kernel symbol table: Normal unused symbols */ \
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__ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \
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VMLINUX_SYMBOL(__start___ksymtab_unused) = .; \
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*(__ksymtab_unused) \
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*(SORT(___ksymtab_unused+*)) \
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VMLINUX_SYMBOL(__stop___ksymtab_unused) = .; \
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} \
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\
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/* Kernel symbol table: GPL-only unused symbols */ \
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__ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
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VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .; \
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*(__ksymtab_unused_gpl) \
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*(SORT(___ksymtab_unused_gpl+*)) \
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VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .; \
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} \
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\
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/* Kernel symbol table: GPL-future-only symbols */ \
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__ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
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VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .; \
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*(__ksymtab_gpl_future) \
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*(SORT(___ksymtab_gpl_future+*)) \
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VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .; \
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} \
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\
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/* Kernel symbol table: Normal symbols */ \
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__kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \
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VMLINUX_SYMBOL(__start___kcrctab) = .; \
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*(__kcrctab) \
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*(SORT(___kcrctab+*)) \
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VMLINUX_SYMBOL(__stop___kcrctab) = .; \
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} \
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\
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/* Kernel symbol table: GPL-only symbols */ \
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__kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \
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VMLINUX_SYMBOL(__start___kcrctab_gpl) = .; \
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*(__kcrctab_gpl) \
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*(SORT(___kcrctab_gpl+*)) \
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VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .; \
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} \
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\
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/* Kernel symbol table: Normal unused symbols */ \
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__kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \
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VMLINUX_SYMBOL(__start___kcrctab_unused) = .; \
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*(__kcrctab_unused) \
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*(SORT(___kcrctab_unused+*)) \
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VMLINUX_SYMBOL(__stop___kcrctab_unused) = .; \
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} \
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\
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/* Kernel symbol table: GPL-only unused symbols */ \
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__kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
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VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .; \
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*(__kcrctab_unused_gpl) \
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*(SORT(___kcrctab_unused_gpl+*)) \
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VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .; \
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} \
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\
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/* Kernel symbol table: GPL-future-only symbols */ \
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__kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
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VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .; \
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*(__kcrctab_gpl_future) \
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*(SORT(___kcrctab_gpl_future+*)) \
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VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .; \
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} \
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\
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@ -224,7 +224,7 @@ struct module_use {
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extern void *__crc_##sym __attribute__((weak)); \
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static const unsigned long __kcrctab_##sym \
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__used \
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__attribute__((section("__kcrctab" sec), unused)) \
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__attribute__((section("___kcrctab" sec "+" #sym), unused)) \
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= (unsigned long) &__crc_##sym;
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#else
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#define __CRC_SYMBOL(sym, sec)
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@ -239,7 +239,7 @@ struct module_use {
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= MODULE_SYMBOL_PREFIX #sym; \
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static const struct kernel_symbol __ksymtab_##sym \
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__used \
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__attribute__((section("__ksymtab" sec), unused)) \
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__attribute__((section("___ksymtab" sec "+" #sym), unused)) \
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= { (unsigned long)&sym, __kstrtab_##sym }
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#define EXPORT_SYMBOL(sym) \
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@ -5,4 +5,15 @@
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*/
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SECTIONS {
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/DISCARD/ : { *(.discard) }
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__ksymtab : { *(SORT(___ksymtab+*)) }
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__ksymtab_gpl : { *(SORT(___ksymtab_gpl+*)) }
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__ksymtab_unused : { *(SORT(___ksymtab_unused+*)) }
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__ksymtab_unused_gpl : { *(SORT(___ksymtab_unused_gpl+*)) }
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__ksymtab_gpl_future : { *(SORT(___ksymtab_gpl_future+*)) }
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__kcrctab : { *(SORT(___kcrctab+*)) }
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__kcrctab_gpl : { *(SORT(___kcrctab_gpl+*)) }
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__kcrctab_unused : { *(SORT(___kcrctab_unused+*)) }
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__kcrctab_unused_gpl : { *(SORT(___kcrctab_unused_gpl+*)) }
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__kcrctab_gpl_future : { *(SORT(___kcrctab_gpl_future+*)) }
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}
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