4ab07fd3fb
"unwind: Index not found eef26358" warnings keep popping up on CONFIG_ARM_MODULE_PLTS-enabled systems if the PC points to a PLT veneer. Teach the unwinder how to deal with them, taking into account they don't change state of the stack or register file except loading PC. Link: https://lore.kernel.org/linux-arm-kernel/20200402153845.30985-1-kursad.oney@broadcom.com/ Tested-by: Kursad Oney <kursad.oney@broadcom.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Alexander Sverdlin <alexander.sverdlin@nokia.com> Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
57 lines
1.3 KiB
C
57 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_ARM_MODULE_H
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#define _ASM_ARM_MODULE_H
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#include <asm-generic/module.h>
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#include <asm/unwind.h>
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#ifdef CONFIG_ARM_UNWIND
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#define ELF_SECTION_UNWIND 0x70000001
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#endif
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#define PLT_ENT_STRIDE L1_CACHE_BYTES
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#define PLT_ENT_COUNT (PLT_ENT_STRIDE / sizeof(u32))
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#define PLT_ENT_SIZE (sizeof(struct plt_entries) / PLT_ENT_COUNT)
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struct plt_entries {
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u32 ldr[PLT_ENT_COUNT];
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u32 lit[PLT_ENT_COUNT];
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};
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struct mod_plt_sec {
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struct elf32_shdr *plt;
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struct plt_entries *plt_ent;
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int plt_count;
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};
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struct mod_arch_specific {
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#ifdef CONFIG_ARM_UNWIND
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struct list_head unwind_list;
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struct unwind_table *init_table;
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#endif
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#ifdef CONFIG_ARM_MODULE_PLTS
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struct mod_plt_sec core;
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struct mod_plt_sec init;
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#endif
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};
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struct module;
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u32 get_module_plt(struct module *mod, unsigned long loc, Elf32_Addr val);
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#ifdef CONFIG_ARM_MODULE_PLTS
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bool in_module_plt(unsigned long loc);
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#else
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static inline bool in_module_plt(unsigned long loc) { return false; }
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#endif
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#ifdef CONFIG_THUMB2_KERNEL
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#define HAVE_ARCH_KALLSYMS_SYMBOL_VALUE
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static inline unsigned long kallsyms_symbol_value(const Elf_Sym *sym)
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{
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if (ELF_ST_TYPE(sym->st_info) == STT_FUNC)
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return sym->st_value & ~1;
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return sym->st_value;
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}
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#endif
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#endif /* _ASM_ARM_MODULE_H */
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