c96fca2137
We now have infrastructure in place to mark an EXPORTed symbol as unused. So the natural next step is to warn during buildtime when a module uses a symbol marked UNUSED. Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
147 lines
3.5 KiB
C
147 lines
3.5 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <elf.h>
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#include "elfconfig.h"
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#if KERNEL_ELFCLASS == ELFCLASS32
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#define Elf_Ehdr Elf32_Ehdr
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#define Elf_Shdr Elf32_Shdr
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#define Elf_Sym Elf32_Sym
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#define Elf_Addr Elf32_Addr
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#define Elf_Section Elf32_Section
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#define ELF_ST_BIND ELF32_ST_BIND
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#define ELF_ST_TYPE ELF32_ST_TYPE
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#define Elf_Rel Elf32_Rel
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#define Elf_Rela Elf32_Rela
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#define ELF_R_SYM ELF32_R_SYM
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#define ELF_R_TYPE ELF32_R_TYPE
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#else
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#define Elf_Ehdr Elf64_Ehdr
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#define Elf_Shdr Elf64_Shdr
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#define Elf_Sym Elf64_Sym
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#define Elf_Addr Elf64_Addr
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#define Elf_Section Elf64_Section
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#define ELF_ST_BIND ELF64_ST_BIND
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#define ELF_ST_TYPE ELF64_ST_TYPE
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#define Elf_Rel Elf64_Rel
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#define Elf_Rela Elf64_Rela
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#define ELF_R_SYM ELF64_R_SYM
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#define ELF_R_TYPE ELF64_R_TYPE
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#endif
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/* The 64-bit MIPS ELF ABI uses an unusual reloc format. */
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typedef struct
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{
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Elf32_Word r_sym; /* Symbol index */
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unsigned char r_ssym; /* Special symbol for 2nd relocation */
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unsigned char r_type3; /* 3rd relocation type */
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unsigned char r_type2; /* 2nd relocation type */
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unsigned char r_type1; /* 1st relocation type */
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} _Elf64_Mips_R_Info;
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typedef union
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{
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Elf64_Xword r_info_number;
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_Elf64_Mips_R_Info r_info_fields;
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} _Elf64_Mips_R_Info_union;
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#define ELF64_MIPS_R_SYM(i) \
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((__extension__ (_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_sym)
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#if KERNEL_ELFDATA != HOST_ELFDATA
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static inline void __endian(const void *src, void *dest, unsigned int size)
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{
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unsigned int i;
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for (i = 0; i < size; i++)
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((unsigned char*)dest)[i] = ((unsigned char*)src)[size - i-1];
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}
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#define TO_NATIVE(x) \
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({ \
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typeof(x) __x; \
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__endian(&(x), &(__x), sizeof(__x)); \
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__x; \
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})
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#else /* endianness matches */
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#define TO_NATIVE(x) (x)
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#endif
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#define NOFAIL(ptr) do_nofail((ptr), #ptr)
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void *do_nofail(void *ptr, const char *expr);
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struct buffer {
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char *p;
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int pos;
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int size;
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};
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void __attribute__((format(printf, 2, 3)))
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buf_printf(struct buffer *buf, const char *fmt, ...);
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void
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buf_write(struct buffer *buf, const char *s, int len);
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struct module {
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struct module *next;
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const char *name;
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int gpl_compatible;
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struct symbol *unres;
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int seen;
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int skip;
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int has_init;
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int has_cleanup;
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struct buffer dev_table_buf;
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char srcversion[25];
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};
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struct elf_info {
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unsigned long size;
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Elf_Ehdr *hdr;
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Elf_Shdr *sechdrs;
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Elf_Sym *symtab_start;
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Elf_Sym *symtab_stop;
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Elf_Section export_sec;
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Elf_Section export_unused_sec;
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Elf_Section export_gpl_sec;
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Elf_Section export_unused_gpl_sec;
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Elf_Section export_gpl_future_sec;
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const char *strtab;
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char *modinfo;
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unsigned int modinfo_len;
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};
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/* file2alias.c */
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void handle_moddevtable(struct module *mod, struct elf_info *info,
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Elf_Sym *sym, const char *symname);
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void add_moddevtable(struct buffer *buf, struct module *mod);
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/* sumversion.c */
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void maybe_frob_rcs_version(const char *modfilename,
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char *version,
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void *modinfo,
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unsigned long modinfo_offset);
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void get_src_version(const char *modname, char sum[], unsigned sumlen);
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/* from modpost.c */
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void *grab_file(const char *filename, unsigned long *size);
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char* get_next_line(unsigned long *pos, void *file, unsigned long size);
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void release_file(void *file, unsigned long size);
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void fatal(const char *fmt, ...);
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void warn(const char *fmt, ...);
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