From 2542e49e21e6b7270f72c7be0fc4ff1a986371da Mon Sep 17 00:00:00 2001 From: Jozef Lawrynowicz Date: Mon, 3 Sep 2018 11:04:05 +0930 Subject: [PATCH] PR23595, simple objcopy of executable failure for msp430-elf VMA of the first section in the segment containing the ELF file header (and possibly section headers too) can't be used to reliably find the size of the headers plus padding. What's really needed is sh_offset of the first section assuming it has contents (vma does have a relationship to sh_offset, but is only guaranteed in demand paged executables). If the first section is SHT_NOBITS and it hasn't been converted to have file contents by the existence of a following SHT_PROGBITS section in the same segment, the sh_offset value also isn't reliable. PR 23595 elf.c (copy_elf_program_header): When first segment contains only the headers and SHT_NOBITS sections, use segment p_filesz to calculate header and padding size. Use filepos of the first section otherwise. --- bfd/ChangeLog | 9 +++++++++ bfd/elf.c | 16 ++++++++++++++-- 2 files changed, 23 insertions(+), 2 deletions(-) diff --git a/bfd/ChangeLog b/bfd/ChangeLog index 792df8a1fa5..9a3b9b1ec28 100644 --- a/bfd/ChangeLog +++ b/bfd/ChangeLog @@ -1,3 +1,12 @@ +2018-09-03 Jozef Lawrynowicz + Alan Modra + + PR 23595 + elf.c (copy_elf_program_header): When first segment contains + only the headers and SHT_NOBITS sections, use segment p_filesz + to calculate header and padding size. Use filepos of the first + section otherwise. + 018-08-31 H.J. Lu PR ld/23600 diff --git a/bfd/elf.c b/bfd/elf.c index b8860c453b5..02d605c19c0 100644 --- a/bfd/elf.c +++ b/bfd/elf.c @@ -7235,6 +7235,7 @@ copy_elf_program_header (bfd *ibfd, bfd *obfd) Elf_Internal_Shdr *this_hdr; asection *first_section = NULL; asection *lowest_section; + bfd_boolean no_contents = TRUE; /* Compute how many sections are in this segment. */ for (section = ibfd->sections, section_count = 0; @@ -7246,6 +7247,8 @@ copy_elf_program_header (bfd *ibfd, bfd *obfd) { if (first_section == NULL) first_section = section; + if (elf_section_type (section) != SHT_NOBITS) + no_contents = FALSE; section_count++; } } @@ -7342,8 +7345,17 @@ copy_elf_program_header (bfd *ibfd, bfd *obfd) } if (map->includes_filehdr && lowest_section != NULL) - /* We need to keep the space used by the headers fixed. */ - map->header_size = lowest_section->vma - segment->p_vaddr; + { + /* Try to keep the space used by the headers plus any + padding fixed. If there are sections with file contents + in this segment then the lowest sh_offset is the best + guess. Otherwise the segment only has file contents for + the headers, and p_filesz is the best guess. */ + if (no_contents) + map->header_size = segment->p_filesz; + else + map->header_size = lowest_section->filepos; + } if (!map->includes_phdrs && !map->includes_filehdr -- 2.30.2