27eb5ffcb7
With CONFIG_LTO_CLANG_FULL, LLVM drops all CFI jump table symbols from vmlinux, which doesn't affect kernel functionality, but can make stack traces and other kernel output that prints out jump table addresses harder to read. This change works around the issue for now by adding a script that tells kallsyms about the missing jump table symbols, even though they don't actually exist in the symbol table, and generates a linker script to add the missing symbols to kernel modules. Bug: 186152035 Bug: 187415564 Change-Id: Ic3c51751c756f2f5fb2a31229e16c3397eb6e666 Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
73 lines
1.9 KiB
ArmAsm
73 lines
1.9 KiB
ArmAsm
/*
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* Common module linker script, always used when linking a module.
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* Archs are free to supply their own linker scripts. ld will
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* combine them automatically.
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*/
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#include <asm/page.h>
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SECTIONS {
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/DISCARD/ : {
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*(.discard)
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*(.discard.*)
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/*
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* LLD may emit .eh_frame with CONFIG_CFI_CLANG despite
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* -fno-asynchronous-unwind-tables. Discard the section.
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*/
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*(.eh_frame)
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}
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__ksymtab 0 : { *(SORT(___ksymtab+*)) }
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__ksymtab_gpl 0 : { *(SORT(___ksymtab_gpl+*)) }
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__ksymtab_unused 0 : { *(SORT(___ksymtab_unused+*)) }
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__ksymtab_unused_gpl 0 : { *(SORT(___ksymtab_unused_gpl+*)) }
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__ksymtab_gpl_future 0 : { *(SORT(___ksymtab_gpl_future+*)) }
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__kcrctab 0 : { *(SORT(___kcrctab+*)) }
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__kcrctab_gpl 0 : { *(SORT(___kcrctab_gpl+*)) }
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__kcrctab_unused 0 : { *(SORT(___kcrctab_unused+*)) }
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__kcrctab_unused_gpl 0 : { *(SORT(___kcrctab_unused_gpl+*)) }
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__kcrctab_gpl_future 0 : { *(SORT(___kcrctab_gpl_future+*)) }
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.init_array 0 : ALIGN(8) { *(SORT(.init_array.*)) *(.init_array) }
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__jump_table 0 : ALIGN(8) { KEEP(*(__jump_table)) }
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__patchable_function_entries : { *(__patchable_function_entries) }
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/*
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* With CONFIG_LTO_CLANG, LLD always enables -fdata-sections and
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* -ffunction-sections, which increases the size of the final module.
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* Merge the split sections in the final binary.
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*/
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.bss : {
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*(.bss .bss.[0-9a-zA-Z_]*)
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*(.bss..L*)
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}
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.data : {
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*(.data .data.[0-9a-zA-Z_]*)
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*(.data..L*)
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}
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.rodata : {
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*(.rodata .rodata.[0-9a-zA-Z_]*)
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*(.rodata..L*)
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}
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#ifdef CONFIG_CFI_CLANG
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/*
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* With CFI_CLANG, ensure __cfi_check is at the beginning of the
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* .text section, and that the section is aligned to page size.
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*/
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.text : ALIGN(PAGE_SIZE) {
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*(.text.__cfi_check)
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*(.text .text.[0-9a-zA-Z_]*)
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__cfi_jt_start = .;
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*(.text..L.cfi.jumptable .text..L.cfi.jumptable.*)
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__cfi_jt_end = .;
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}
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#endif
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}
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/* bring in arch-specific sections */
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#include <asm/module.lds.h>
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