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ldconfig/x86: Store ISA level in cache and aux cache

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Store ISA level in the portion of the unused upper 32 bits of the hwcaps
field in cache and the unused pad field in aux cache.  ISA level is stored
and checked only for shared objects in glibc-hwcaps subdirectories.  The
shared objects in the default directories aren't checked since there are
no fallbacks for these shared objects.

Tested on x86-64-v2, x86-64-v3 and x86-64-v4 machines with
--disable-hardcoded-path-in-tests and --enable-hardcoded-path-in-tests.
This commit is contained in:
H.J. Lu
2020-12-05 07:01:58 -08:00
parent 86a4d3fa7d
commit efbbd9c33a
26 changed files with 598 additions and 110 deletions
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22
sysdeps/unix/sysv/linux/sparc/readelflib.c
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@ -18,29 +18,31 @@
<https://www.gnu.org/licenses/>. */
int process_elf32_file (const char *file_name, const char *lib, int *flag,
unsigned int *osversion, char **soname,
int process_elf32_file (const char *file_name, const char *lib,
int *flag, unsigned int *osversion,
unsigned int *isa_level, char **soname,
void *file_contents, size_t file_length);
int process_elf64_file (const char *file_name, const char *lib, int *flag,
unsigned int *osversion, char **soname,
int process_elf64_file (const char *file_name, const char *lib,
int *flag, unsigned int *osversion,
unsigned int *isa_level, char **soname,
void *file_contents, size_t file_length);
/* Returns 0 if everything is ok, != 0 in case of error. */
int
process_elf_file (const char *file_name, const char *lib, int *flag,
unsigned int *osversion, char **soname, void *file_contents,
size_t file_length)
unsigned int *osversion, unsigned int *isa_level,
char **soname, void *file_contents, size_t file_length)
{
ElfW(Ehdr) *elf_header = (ElfW(Ehdr) *) file_contents;
int ret;
if (elf_header->e_ident [EI_CLASS] == ELFCLASS32)
return process_elf32_file (file_name, lib, flag, osversion, soname,
file_contents, file_length);
return process_elf32_file (file_name, lib, flag, osversion, isa_level,
soname, file_contents, file_length);
else
{
ret = process_elf64_file (file_name, lib, flag, osversion, soname,
file_contents, file_length);
ret = process_elf64_file (file_name, lib, flag, osversion, isa_level,
soname, file_contents, file_length);
/* Sparc 64bit libraries are always libc.so.6+. */
if (!ret)
*flag = FLAG_SPARC_LIB64|FLAG_ELF_LIBC6;