eb81f38a62
MIPS64 does not store the 'r_info' field of a relocation table entry as a 64-bit value consisting of a 32-bit symbol index in the high 32 bits and a 32-bit type in the low 32 bits as on other architectures. Instead, the 64-bit 'r_info' field is really a 32-bit symbol index followed by four individual byte type fields. For big-endian MIPS64, treating this as a 64-bit integer happens to be compatible with the layout expected by other architectures (symbol index in upper 32-bits of resulting "native" 64-bit integer). However, for little-endian MIPS64 the parsed 64-bit integer contains the symbol index in the low 32 bits and the 4 individual byte type fields in the upper 32-bits (but as if the upper 32-bits were byte-swapped). To cope, add two helper routines in gelf_getrel.c to translate between the correct native 'r_info' value and the value obtained after the normal byte-swap translation. Use these routines in gelf_getrel(), gelf_getrela(), gelf_update_rel(), and gelf_update_rela(). This fixes 'readelf -r' on little-endian MIPS64 objects which was previously decoding incorrect relocations as well as 'objcopy: invalid symbox index' warnings from objcopy when extracting debug symbols from kernel modules. Even with this fixed, objcopy was still crashing when trying to extract debug symbols from little-endian MIPS64 modules. The workaround in gelf_*rel*() depends on the current ELF object having a valid ELF header so that the 'e_machine' field can be compared against EM_MIPS. objcopy was parsing the relocation entries to possibly rewrite the 'r_info' fields in the update_relocs() function before writing the initial ELF header to the destination object file. Move the initial write of the ELF header earlier before copy_contents() so that update_relocs() uses the correct symbol index values. Note that this change should really go upstream. The binutils readelf source has a similar hack for MIPS64EL though I implemented this version from scratch using the MIPS64 ABI PDF as a reference. Discussed with: jkoshy Reviewed by: emaste, imp Approved by: re (gjb, kib) MFC after: 1 month Differential Revision: https://reviews.freebsd.org/D15734
167 lines
3.8 KiB
Makefile
167 lines
3.8 KiB
Makefile
# $Id: Makefile 3594 2018-04-11 18:26:50Z jkoshy $
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TOP= ..
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LIB= elf
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SRCS= elf.c \
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elf_begin.c \
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elf_cntl.c \
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elf_end.c elf_errmsg.c elf_errno.c \
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elf_data.c \
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elf_fill.c \
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elf_flag.c \
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elf_getarhdr.c \
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elf_getarsym.c \
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elf_getbase.c \
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elf_getident.c \
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elf_hash.c \
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elf_kind.c \
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elf_memory.c \
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elf_next.c \
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elf_open.c \
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elf_rand.c \
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elf_rawfile.c \
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elf_phnum.c \
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elf_shnum.c \
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elf_shstrndx.c \
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elf_scn.c \
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elf_strptr.c \
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elf_update.c \
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elf_version.c \
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gelf_cap.c \
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gelf_checksum.c \
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gelf_dyn.c \
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gelf_ehdr.c \
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gelf_getclass.c \
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gelf_fsize.c \
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gelf_mips64el.c \
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gelf_move.c \
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gelf_phdr.c \
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gelf_rel.c \
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gelf_rela.c \
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gelf_shdr.c \
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gelf_sym.c \
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gelf_syminfo.c \
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gelf_symshndx.c \
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gelf_xlate.c \
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libelf_align.c \
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libelf_allocate.c \
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libelf_ar.c \
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libelf_ar_util.c \
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libelf_checksum.c \
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libelf_data.c \
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libelf_ehdr.c \
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libelf_extended.c \
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libelf_memory.c \
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libelf_open.c \
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libelf_phdr.c \
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libelf_shdr.c \
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libelf_xlate.c \
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${GENSRCS}
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INCS= libelf.h gelf.h
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INCSDIR= /usr/include
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GENSRCS= libelf_fsize.c libelf_msize.c libelf_convert.c
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CLEANFILES= ${GENSRCS}
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SHLIB_MAJOR= 1
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WARNS?= 6
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MAN= elf.3 \
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elf_begin.3 \
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elf_cntl.3 \
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elf_end.3 \
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elf_errmsg.3 \
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elf_fill.3 \
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elf_flagdata.3 \
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elf_getarhdr.3 \
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elf_getarsym.3 \
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elf_getbase.3 \
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elf_getdata.3 \
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elf_getident.3 \
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elf_getscn.3 \
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elf_getphdrnum.3 \
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elf_getphnum.3 \
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elf_getshdrnum.3 \
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elf_getshnum.3 \
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elf_getshdrstrndx.3 \
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elf_getshstrndx.3 \
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elf_hash.3 \
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elf_kind.3 \
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elf_memory.3 \
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elf_next.3 \
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elf_open.3 \
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elf_rawfile.3 \
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elf_rand.3 \
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elf_strptr.3 \
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elf_update.3 \
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elf_version.3 \
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gelf.3 \
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gelf_checksum.3 \
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gelf_fsize.3 \
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gelf_getcap.3 \
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gelf_getclass.3 \
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gelf_getdyn.3 \
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gelf_getehdr.3 \
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gelf_getmove.3 \
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gelf_getphdr.3 \
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gelf_getrel.3 \
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gelf_getrela.3 \
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gelf_getshdr.3 \
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gelf_getsym.3 \
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gelf_getsyminfo.3 \
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gelf_getsymshndx.3 \
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gelf_newehdr.3 \
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gelf_newphdr.3 \
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gelf_update_ehdr.3 \
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gelf_xlatetof.3
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MLINKS+= \
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elf_errmsg.3 elf_errno.3 \
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elf_flagdata.3 elf_flagarhdr.3 \
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elf_flagdata.3 elf_flagehdr.3 \
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elf_flagdata.3 elf_flagelf.3 \
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elf_flagdata.3 elf_flagphdr.3 \
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elf_flagdata.3 elf_flagscn.3 \
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elf_flagdata.3 elf_flagshdr.3 \
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elf_getdata.3 elf_newdata.3 \
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elf_getdata.3 elf_rawdata.3 \
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elf_getscn.3 elf_ndxscn.3 \
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elf_getscn.3 elf_newscn.3 \
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elf_getscn.3 elf_nextscn.3 \
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elf_getshstrndx.3 elf_setshstrndx.3 \
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elf_open.3 elf_openmemory.3 \
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gelf_getcap.3 gelf_update_cap.3 \
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gelf_getdyn.3 gelf_update_dyn.3 \
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gelf_getmove.3 gelf_update_move.3 \
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gelf_getrel.3 gelf_update_rel.3 \
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gelf_getrela.3 gelf_update_rela.3 \
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gelf_getsym.3 gelf_update_sym.3 \
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gelf_getsyminfo.3 gelf_update_syminfo.3 \
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gelf_getsymshndx.3 gelf_update_symshndx.3 \
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gelf_update_ehdr.3 gelf_update_phdr.3 \
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gelf_update_ehdr.3 gelf_update_shdr.3 \
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gelf_xlatetof.3 gelf_xlatetom.3
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.for E in 32 64
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MLINKS+= \
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gelf_checksum.3 elf${E}_checksum.3 \
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gelf_fsize.3 elf${E}_fsize.3 \
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gelf_getehdr.3 elf${E}_getehdr.3 \
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gelf_getphdr.3 elf${E}_getphdr.3 \
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gelf_getshdr.3 elf${E}_getshdr.3 \
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gelf_newehdr.3 elf${E}_newehdr.3 \
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gelf_newphdr.3 elf${E}_newphdr.3 \
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gelf_xlatetof.3 elf${E}_xlatetof.3 \
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gelf_xlatetof.3 elf${E}_xlatetom.3
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.endfor
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libelf_convert.c: elf_types.m4 libelf_convert.m4
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libelf_fsize.c: elf_types.m4 libelf_fsize.m4
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libelf_msize.c: elf_types.m4 libelf_msize.m4
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.include "${TOP}/mk/elftoolchain.lib.mk"
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