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linux-user: introduce functions to detect CPU type

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Add a function to return ELF e_flags and use it
to select the CPU model.

Signed-off-by: YunQiang Su <syq@debian.org>
[lv: split the patch and some cleanup in get_elf_eflags()]
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20180220173307.25125-3-laurent@vivier.eu>
This commit is contained in:
YunQiang Su 2018-02-20 18:33:05 +01:00 • committed by Laurent Vivier
parent 542ca43498
commit 768fe76e92
3 changed files with 46 additions and 10 deletions
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35
linux-user/elfload.c
View file

@ -2396,6 +2396,41 @@ give_up:
g_free(syms);
}
uint32_t get_elf_eflags(int fd)
{
struct elfhdr ehdr;
off_t offset;
int ret;
/* Read ELF header */
offset = lseek(fd, 0, SEEK_SET);
if (offset == (off_t) -1) {
return 0;
}
ret = read(fd, &ehdr, sizeof(ehdr));
if (ret < sizeof(ehdr)) {
return 0;
}
offset = lseek(fd, offset, SEEK_SET);
if (offset == (off_t) -1) {
return 0;
}
/* Check ELF signature */
if (!elf_check_ident(&ehdr)) {
return 0;
}
/* check header */
bswap_ehdr(&ehdr);
if (!elf_check_ehdr(&ehdr)) {
return 0;
}
/* return architecture id */
return ehdr.e_flags;
}
int load_elf_binary(struct linux_binprm *bprm, struct image_info *info)
{
struct image_info interp_info;