diff options
Diffstat (limited to 'arch/arc/kernel/module.c')
-rw-r--r-- | arch/arc/kernel/module.c | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/arch/arc/kernel/module.c b/arch/arc/kernel/module.c index a1bb70d6e97..cdd359352c0 100644 --- a/arch/arc/kernel/module.c +++ b/arch/arc/kernel/module.c @@ -14,6 +14,7 @@ #include <linux/slab.h> #include <linux/fs.h> #include <linux/string.h> +#include <asm/unwind.h> static inline void arc_write_me(unsigned short *addr, unsigned long value) { @@ -21,6 +22,42 @@ static inline void arc_write_me(unsigned short *addr, unsigned long value) *(addr + 1) = (value & 0xffff); } +/* ARC specific section quirks - before relocation loop in generic loader + * + * For dwarf unwinding out of modules, this needs to + * 1. Ensure the .debug_frame is allocatable (ARC Linker bug: despite + * -fasynchronous-unwind-tables it doesn't). + * 2. Since we are iterating thru sec hdr tbl anyways, make a note of + * the exact section index, for later use. + */ +int module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs, + char *secstr, struct module *mod) +{ +#ifdef CONFIG_ARC_DW2_UNWIND + int i; + + mod->arch.unw_sec_idx = 0; + mod->arch.unw_info = NULL; + + for (i = 1; i < hdr->e_shnum; i++) { + if (strcmp(secstr+sechdrs[i].sh_name, ".debug_frame") == 0) { + sechdrs[i].sh_flags |= SHF_ALLOC; + mod->arch.unw_sec_idx = i; + break; + } + } +#endif + return 0; +} + +void module_arch_cleanup(struct module *mod) +{ +#ifdef CONFIG_ARC_DW2_UNWIND + if (mod->arch.unw_info) + unwind_remove_table(mod->arch.unw_info, 0); +#endif +} + int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex, /* sec index for sym tbl */ @@ -85,3 +122,24 @@ relo_err: return -ENOEXEC; } + +/* Just before lift off: After sections have been relocated, we add the + * dwarf section to unwinder table pool + * This couldn't be done in module_frob_arch_sections() because + * relocations had not been applied by then + */ +int module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs, + struct module *mod) +{ +#ifdef CONFIG_ARC_DW2_UNWIND + void *unw; + int unwsec = mod->arch.unw_sec_idx; + + if (unwsec) { + unw = unwind_add_table(mod, (void *)sechdrs[unwsec].sh_addr, + sechdrs[unwsec].sh_size); + mod->arch.unw_info = unw; + } +#endif + return 0; +} |