diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/asm-generic/vmlinux.lds.h | 49 | ||||
| -rw-r--r-- | include/linux/hidden.h | 19 |
2 files changed, 61 insertions, 7 deletions
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index 7636bc71c71f..b33577d2e5ee 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -34,6 +34,7 @@ * * STABS_DEBUG * DWARF_DEBUG + * ELF_DETAILS * * DISCARDS // must be the last * } @@ -581,7 +582,10 @@ */ #define TEXT_TEXT \ ALIGN_FUNCTION(); \ - *(.text.hot TEXT_MAIN .text.fixup .text.unlikely) \ + *(.text.hot .text.hot.*) \ + *(TEXT_MAIN .text.fixup) \ + *(.text.unlikely .text.unlikely.*) \ + *(.text.unknown .text.unknown.*) \ NOINSTR_TEXT \ *(.text..refcount) \ *(.ref.text) \ @@ -812,15 +816,21 @@ .debug_macro 0 : { *(.debug_macro) } \ .debug_addr 0 : { *(.debug_addr) } - /* Stabs debugging sections. */ +/* Stabs debugging sections. */ #define STABS_DEBUG \ .stab 0 : { *(.stab) } \ .stabstr 0 : { *(.stabstr) } \ .stab.excl 0 : { *(.stab.excl) } \ .stab.exclstr 0 : { *(.stab.exclstr) } \ .stab.index 0 : { *(.stab.index) } \ - .stab.indexstr 0 : { *(.stab.indexstr) } \ - .comment 0 : { *(.comment) } + .stab.indexstr 0 : { *(.stab.indexstr) } + +/* Required sections not related to debugging. */ +#define ELF_DETAILS \ + .comment 0 : { *(.comment) } \ + .symtab 0 : { *(.symtab) } \ + .strtab 0 : { *(.strtab) } \ + .shstrtab 0 : { *(.shstrtab) } #ifdef CONFIG_GENERIC_BUG #define BUG_TABLE \ @@ -955,13 +965,38 @@ EXIT_DATA #endif +/* + * Clang's -fsanitize=kernel-address and -fsanitize=thread produce + * unwanted sections (.eh_frame and .init_array.*), but + * CONFIG_CONSTRUCTORS wants to keep any .init_array.* sections. + * https://bugs.llvm.org/show_bug.cgi?id=46478 + */ +#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KCSAN) +# ifdef CONFIG_CONSTRUCTORS +# define SANITIZER_DISCARDS \ + *(.eh_frame) +# else +# define SANITIZER_DISCARDS \ + *(.init_array) *(.init_array.*) \ + *(.eh_frame) +# endif +#else +# define SANITIZER_DISCARDS +#endif + +#define COMMON_DISCARDS \ + SANITIZER_DISCARDS \ + *(.discard) \ + *(.discard.*) \ + *(.modinfo) \ + /* ld.bfd warns about .gnu.version* even when not emitted */ \ + *(.gnu.version*) \ + #define DISCARDS \ /DISCARD/ : { \ EXIT_DISCARDS \ EXIT_CALL \ - *(.discard) \ - *(.discard.*) \ - *(.modinfo) \ + COMMON_DISCARDS \ } /** diff --git a/include/linux/hidden.h b/include/linux/hidden.h new file mode 100644 index 000000000000..49a17b6b5962 --- /dev/null +++ b/include/linux/hidden.h @@ -0,0 +1,19 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * When building position independent code with GCC using the -fPIC option, + * (or even the -fPIE one on older versions), it will assume that we are + * building a dynamic object (either a shared library or an executable) that + * may have symbol references that can only be resolved at load time. For a + * variety of reasons (ELF symbol preemption, the CoW footprint of the section + * that is modified by the loader), this results in all references to symbols + * with external linkage to go via entries in the Global Offset Table (GOT), + * which carries absolute addresses which need to be fixed up when the + * executable image is loaded at an offset which is different from its link + * time offset. + * + * Fortunately, there is a way to inform the compiler that such symbol + * references will be satisfied at link time rather than at load time, by + * giving them 'hidden' visibility. + */ + +#pragma GCC visibility push(hidden) |