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Introduce a constant, ELF_NOTE_ROUNDSIZE, which evidently declare our

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intention to use 4-byte padding for elf notes.

MFC after:	3 weeks
This commit is contained in:
Mikolaj Golub 2013-05-01 14:59:16 +00:00
parent f26a777c9e
commit 1b8388cde9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=250145
1 changed files with 10 additions and 9 deletions
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19
sys/kern/imgact_elf.c
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@ -81,6 +81,7 @@ __FBSDID("$FreeBSD$");
#include <machine/elf.h>
#include <machine/md_var.h>
#define ELF_NOTE_ROUNDSIZE 4
#define OLD_EI_BRAND 8
static int __elfN(check_header)(const Elf_Ehdr *hdr);
@ -161,7 +162,7 @@ __elfN(freebsd_trans_osrel)(const Elf_Note *note, int32_t *osrel)
uintptr_t p;
p = (uintptr_t)(note + 1);
p += roundup2(note->n_namesz, sizeof(Elf32_Addr));
p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE);
*osrel = *(const int32_t *)(p);
return (TRUE);
@ -186,7 +187,7 @@ kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel)
uintptr_t p;
p = (uintptr_t)(note + 1);
p += roundup2(note->n_namesz, sizeof(Elf32_Addr));
p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE);
desc = (const Elf32_Word *)p;
if (desc[0] != GNU_KFREEBSD_ABI_DESC)
@ -1546,7 +1547,7 @@ __elfN(puthdr)(struct thread *td, void *hdr, size_t hdrsize, int numsegs,
phdr->p_filesz = notesz;
phdr->p_memsz = 0;
phdr->p_flags = PF_R;
phdr->p_align = sizeof(Elf32_Size);
phdr->p_align = ELF_NOTE_ROUNDSIZE;
phdr++;
/* All the writable segments from the program. */
@ -1574,8 +1575,8 @@ register_note(struct note_info_list *list, int type, outfunc_t out, void *arg)
return (size);
notesize = sizeof(Elf_Note) + /* note header */
roundup2(8, sizeof(Elf32_Size)) + /* note name ("FreeBSD") */
roundup2(size, sizeof(Elf32_Size)); /* note description */
roundup2(8, ELF_NOTE_ROUNDSIZE) + /* note name ("FreeBSD") */
roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */
return (notesize);
}
@ -1598,12 +1599,12 @@ __elfN(putnote)(struct note_info *ninfo, struct sbuf *sb)
sbuf_bcat(sb, &note, sizeof(note));
sbuf_start_section(sb, &old_len);
sbuf_bcat(sb, "FreeBSD", note.n_namesz);
sbuf_end_section(sb, old_len, sizeof(Elf32_Size), 0);
sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0);
if (note.n_descsz == 0)
return;
sbuf_start_section(sb, &old_len);
ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize);
sbuf_end_section(sb, old_len, sizeof(Elf32_Size), 0);
sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0);
}
/*
@ -2004,8 +2005,8 @@ __elfN(parse_notes)(struct image_params *imgp, Elf_Brandnote *checknote,
nextnote:
note = (const Elf_Note *)((const char *)(note + 1) +
roundup2(note->n_namesz, sizeof(Elf32_Addr)) +
roundup2(note->n_descsz, sizeof(Elf32_Addr)));
roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE) +
roundup2(note->n_descsz, ELF_NOTE_ROUNDSIZE));
}
return (FALSE);