diff options
Diffstat (limited to 'tools/elfutils/patches/011-backport-mips-support-strip.patch')
| -rw-r--r-- | tools/elfutils/patches/011-backport-mips-support-strip.patch | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/tools/elfutils/patches/011-backport-mips-support-strip.patch b/tools/elfutils/patches/011-backport-mips-support-strip.patch new file mode 100644 index 0000000000..7ea9bedc1a --- /dev/null +++ b/tools/elfutils/patches/011-backport-mips-support-strip.patch @@ -0,0 +1,230 @@ +In mips64 little-endian, r_info consists of four byte fields(contains +three reloc types) and a 32-bit symbol index. In order to adapt +GELF_R_SYM and GELF_R_TYPE, need convert raw data to get correct symbol +index and type. + + libelf/elf_getdata.c: Some eu-utils use read-mmap method to map file, +so we need to malloc and memcpy raw data to avoid segment fault. After +modification, the correct value are saved in the malloced memory not in +process address space. + libelf/elf_updata.c: Because we converted the relocation info in mips +order when we call elf_getdata.c, so we need to convert the modified data +in original order bits before writing the data to the file. + +Signed-off-by: Ying Huang <ying.huang@oss.cipunited.com> +--- + libelf/elf_getdata.c | 132 ++++++++++++++++++++++++++++++++++++++++++- + libelf/elf_update.c | 53 +++++++++++++++++ + 2 files changed, 183 insertions(+), 2 deletions(-) + +--- a/libelf/elf_getdata.c ++++ b/libelf/elf_getdata.c +@@ -135,6 +135,119 @@ __libelf_data_type (GElf_Ehdr *ehdr, int + + /* Convert the data in the current section. */ + static void ++convert_data_for_mips64el (Elf_Scn *scn, int eclass, ++ int data, size_t size, Elf_Type type) ++{ ++ /* Do we need to convert the data and/or adjust for alignment? */ ++ if (data == MY_ELFDATA || type == ELF_T_BYTE) ++ { ++ /* In order to adapt macro GELF_R_SYM and GELF_R_TYPE on mips64, need to convert ++ relocation info(raw data). Some eu-utils use read-mmap method to map file, so ++ we need to malloc and memcpy raw data to avoid segment fault. After modification, ++ the correct value are saved in the malloced memory not in process address space. */ ++ scn->data_base = malloc (size); ++ if (scn->data_base == NULL) ++ { ++ __libelf_seterrno (ELF_E_NOMEM); ++ return; ++ } ++ ++ /* The copy will be appropriately aligned for direct access. */ ++ memcpy (scn->data_base, scn->rawdata_base, size); ++ } ++ else ++ { ++ xfct_t fp; ++ ++ scn->data_base = malloc (size); ++ if (scn->data_base == NULL) ++ { ++ __libelf_seterrno (ELF_E_NOMEM); ++ return; ++ } ++ ++ /* Make sure the source is correctly aligned for the conversion ++ function to directly access the data elements. */ ++ char *rawdata_source; ++ /* In order to adapt macro GELF_R_SYM and GELF_R_TYPE on mips64, need to convert ++ relocation info(raw data). Some eu-utils use read-mmap method to map file, so ++ we need to malloc and memcpy raw data to avoid segment fault. After modification, ++ the correct value are saved in the malloced memory not in process address space. */ ++ rawdata_source = malloc (size); ++ if (rawdata_source == NULL) ++ { ++ __libelf_seterrno (ELF_E_NOMEM); ++ return; ++ } ++ ++ /* The copy will be appropriately aligned for direct access. */ ++ memcpy (rawdata_source, scn->rawdata_base, size); ++ ++ /* Get the conversion function. */ ++ fp = __elf_xfctstom[eclass - 1][type]; ++ ++ fp (scn->data_base, rawdata_source, size, 0); ++ ++ if (rawdata_source != scn->rawdata_base) ++ free (rawdata_source); ++ } ++ ++ scn->data_list.data.d.d_buf = scn->data_base; ++ scn->data_list.data.d.d_size = size; ++ scn->data_list.data.d.d_type = type; ++ scn->data_list.data.d.d_off = scn->rawdata.d.d_off; ++ scn->data_list.data.d.d_align = scn->rawdata.d.d_align; ++ scn->data_list.data.d.d_version = scn->rawdata.d.d_version; ++ ++ scn->data_list.data.s = scn; ++ ++ /* In mips64 little-endian, r_info consists of four byte fields(contains ++ three reloc types) and a 32-bit symbol index. In order to adapt ++ GELF_R_SYM and GELF_R_TYPE, need to convert r_info to get correct symbol ++ index and type. */ ++ /* references: ++ https://www.linux-mips.org/pub/linux/mips/doc/ABI/elf64-2.4.pdf ++ Page40 && Page41 */ ++ GElf_Shdr shdr_mem; ++ GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem); ++ if (shdr->sh_type == SHT_REL) ++ { ++ size_t sh_entsize = gelf_fsize (scn->elf, ELF_T_REL, 1, EV_CURRENT); ++ int nentries = shdr->sh_size / sh_entsize; ++ for (int cnt = 0; cnt < nentries; ++cnt) ++ { ++ Elf_Data_Scn *data_scn = (Elf_Data_Scn *) &scn->data_list.data.d; ++ Elf64_Rel *value = &((Elf64_Rel *) data_scn->d.d_buf)[cnt]; ++ Elf64_Xword info = value->r_info; ++ value->r_info = (((info & 0xffffffff) << 32) ++ | ((info >> 56) & 0xff) ++ | ((info >> 40) & 0xff00) ++ | ((info >> 24) & 0xff0000) ++ | ((info >> 8) & 0xff000000)); ++ ((Elf64_Rel *) data_scn->d.d_buf)[cnt] = *value; ++ } ++ } ++ else if (shdr->sh_type == SHT_RELA) ++ { ++ size_t sh_entsize = gelf_fsize (scn->elf, ELF_T_RELA, 1, EV_CURRENT); ++ int nentries = shdr->sh_size / sh_entsize; ++ for (int cnt = 0; cnt < nentries; cnt++) ++ { ++ Elf_Data_Scn *data_scn = (Elf_Data_Scn *) &scn->data_list.data.d; ++ Elf64_Rela *value = &((Elf64_Rela *) data_scn->d.d_buf)[cnt]; ++ Elf64_Xword info = value->r_info; ++ value->r_info = (((info & 0xffffffff) << 32) ++ | ((info >> 56) & 0xff) ++ | ((info >> 40) & 0xff00) ++ | ((info >> 24) & 0xff0000) ++ | ((info >> 8) & 0xff000000)); ++ ((Elf64_Rela *) data_scn->d.d_buf)[cnt] = *value; ++ } ++ } ++} ++ ++/* Convert the data in the current section. */ ++static void + convert_data (Elf_Scn *scn, int eclass, + int data, size_t size, Elf_Type type) + { +@@ -451,8 +564,23 @@ __libelf_set_data_list_rdlock (Elf_Scn * + return; + } + +- /* Convert according to the version and the type. */ +- convert_data (scn, elf->class, ++ GElf_Shdr shdr_mem; ++ GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem); ++ GElf_Ehdr ehdr_mem; ++ GElf_Ehdr *ehdr = gelf_getehdr (scn->elf, &ehdr_mem); ++ if (shdr != NULL && (shdr->sh_type == SHT_RELA || shdr->sh_type == SHT_REL) && ++ scn->elf->class == ELFCLASS64 && ehdr != NULL && ++ ehdr->e_machine == EM_MIPS && ehdr->e_ident[EI_DATA] == ELFDATA2LSB) ++ convert_data_for_mips64el (scn, elf->class, ++ (elf->class == ELFCLASS32 ++ || (offsetof (struct Elf, state.elf32.ehdr) ++ == offsetof (struct Elf, state.elf64.ehdr)) ++ ? elf->state.elf32.ehdr->e_ident[EI_DATA] ++ : elf->state.elf64.ehdr->e_ident[EI_DATA]), ++ scn->rawdata.d.d_size, scn->rawdata.d.d_type); ++ else ++ /* Convert according to the version and the type. */ ++ convert_data (scn, elf->class, + (elf->class == ELFCLASS32 + || (offsetof (struct Elf, state.elf32.ehdr) + == offsetof (struct Elf, state.elf64.ehdr)) +--- a/libelf/elf_update.c ++++ b/libelf/elf_update.c +@@ -228,7 +228,60 @@ elf_update (Elf *elf, Elf_Cmd cmd) + size = -1; + } + else ++ { ++ /* Because we converted the relocation info in mips order when we call elf_getdata.c, ++ so we need to convert the modified data in original order bits before writing the ++ data to the file. */ ++ Elf_Scn *scn = NULL; ++ while ((scn = elf_nextscn (elf, scn)) != NULL) ++ { ++ GElf_Shdr shdr_mem; ++ GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem); ++ GElf_Ehdr ehdr_mem; ++ GElf_Ehdr *ehdr = gelf_getehdr (scn->elf, &ehdr_mem); ++ if (shdr != NULL && (shdr->sh_type == SHT_RELA || shdr->sh_type == SHT_REL) && ++ scn->elf->class == ELFCLASS64 && ++ ehdr != NULL && ehdr->e_machine == EM_MIPS && ehdr->e_ident[EI_DATA] == ELFDATA2LSB) ++ { ++ Elf_Data *d = elf_getdata (scn, NULL); ++ if (shdr->sh_type == SHT_REL) ++ { ++ size_t sh_entsize = gelf_fsize (scn->elf, ELF_T_REL, 1, EV_CURRENT); ++ int nentries = shdr->sh_size / sh_entsize; ++ for (int cnt = 0; cnt < nentries; ++cnt) ++ { ++ Elf_Data_Scn *data_scn = (Elf_Data_Scn *) d; ++ Elf64_Rel *value = &((Elf64_Rel *) data_scn->d.d_buf)[cnt]; ++ Elf64_Xword info = value->r_info; ++ value->r_info = (info >> 32 ++ | ((info << 56) & 0xff00000000000000) ++ | ((info << 40) & 0xff000000000000) ++ | ((info << 24) & 0xff0000000000) ++ | ((info << 8) & 0xff00000000)); ++ ((Elf64_Rel *) data_scn->d.d_buf)[cnt] = *value; ++ } ++ } ++ else if (shdr->sh_type == SHT_RELA) ++ { ++ size_t sh_entsize = gelf_fsize (scn->elf, ELF_T_RELA, 1, EV_CURRENT); ++ int nentries = shdr->sh_size / sh_entsize; ++ for (int cnt = 0; cnt < nentries; cnt++) ++ { ++ Elf_Data_Scn *data_scn = (Elf_Data_Scn *) d; ++ Elf64_Rela *value = &((Elf64_Rela *) data_scn->d.d_buf)[cnt]; ++ Elf64_Xword info = value->r_info; ++ value->r_info = (info >> 32 ++ | ((info << 56) & 0xff00000000000000) ++ | ((info << 40) & 0xff000000000000) ++ | ((info << 24) & 0xff0000000000) ++ | ((info << 8) & 0xff00000000)); ++ ((Elf64_Rela *) data_scn->d.d_buf)[cnt] = *value; ++ } ++ } ++ } ++ } + size = write_file (elf, size, change_bo, shnum); ++ } + } + + out: |