x86: Support GNU_PROPERTY_X86_ISA_1_V[234] marker [BZ #26717]

GCC 11 supports -march=x86-64-v[234] to enable x86 micro-architecture ISA
levels:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97250

and -mneeded to emit GNU_PROPERTY_X86_ISA_1_NEEDED property with
GNU_PROPERTY_X86_ISA_1_V[234] marker:

https://gitlab.com/x86-psABIs/x86-64-ABI/-/merge_requests/13

Binutils support for GNU_PROPERTY_X86_ISA_1_V[234] marker were added by

commit b0ab06937385e0ae25cebf1991787d64f439bf12
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Fri Oct 30 06:49:57 2020 -0700

    x86: Support GNU_PROPERTY_X86_ISA_1_BASELINE marker

and

commit 32930e4edbc06bc6f10c435dbcc63131715df678
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Fri Oct 9 05:05:57 2020 -0700

    x86: Support GNU_PROPERTY_X86_ISA_1_V[234] marker

GNU_PROPERTY_X86_ISA_1_NEEDED property in x86 ELF binaries indicate the
micro-architecture ISA level required to execute the binary.  The marker
must be added by programmers explicitly in one of 3 ways:

1. Pass -mneeded to GCC.
2. Add the marker in the linker inputs as this patch does.
3. Pass -z x86-64-v[234] to the linker.

Add GNU_PROPERTY_X86_ISA_1_BASELINE and GNU_PROPERTY_X86_ISA_1_V[234]
marker support to ld.so if binutils 2.32 or newer is used to build glibc:

1. Add GNU_PROPERTY_X86_ISA_1_BASELINE and GNU_PROPERTY_X86_ISA_1_V[234]
markers to elf.h.
2. Add GNU_PROPERTY_X86_ISA_1_BASELINE and GNU_PROPERTY_X86_ISA_1_V[234]
marker to abi-note.o based on the ISA level used to compile abi-note.o,
assuming that the same ISA level is used to compile the whole glibc.
3. Add isa_1 to cpu_features to record the supported x86 ISA level.
4. Rename _dl_process_cet_property_note to _dl_process_property_note and
add GNU_PROPERTY_X86_ISA_1_V[234] marker detection.
5. Update _rtld_main_check and _dl_open_check to check loaded objects
with the incompatible ISA level.
6. Add a testcase to verify that dlopen an x86-64-v4 shared object fails
on lesser platforms.
7. Use <get-isa-level.h> in dl-hwcaps-subdirs.c and tst-glibc-hwcaps.c.

Tested under i686, x32 and x86-64 modes on x86-64-v2, x86-64-v3 and
x86-64-v4 machines.

Marked elf/tst-isa-level-1 with x86-64-v4, ran it on x86-64-v3 machine
and got:

[hjl@gnu-cfl-2 build-x86_64-linux]$ ./elf/tst-isa-level-1
./elf/tst-isa-level-1: CPU ISA level is lower than required
[hjl@gnu-cfl-2 build-x86_64-linux]$

1 files changed, 8 insertions, 22 deletions

diff --git a/sysdeps/x86_64/dl-hwcaps-subdirs.c b/sysdeps/x86_64/dl-hwcaps-subdirs.c
index 0aaa635a00..e030534f1b 100644
--- a/sysdeps/x86_64/dl-hwcaps-subdirs.c
+++ b/sysdeps/x86_64/dl-hwcaps-subdirs.c
@@ -18,6 +18,7 @@
 
 #include <dl-hwcaps.h>
 #include <cpu-features.h>
+#include <get-isa-level.h>
 
 const char _dl_hwcaps_subdirs[] = "x86-64-v4:x86-64-v3:x86-64-v2";
 enum { subdirs_count = 3 }; /* Number of components in _dl_hwcaps_subdirs.  */
@@ -25,40 +26,25 @@ enum { subdirs_count = 3 }; /* Number of components in _dl_hwcaps_subdirs.  */
 uint32_t
 _dl_hwcaps_subdirs_active (void)
 {
+  const struct cpu_features *cpu_features
+    = __x86_get_cpu_features (COMMON_CPUID_INDEX_MAX);
+  unsigned int isa_level = get_isa_level (cpu_features);
   int active = 0;
 
   /* Test in reverse preference order.  */
 
   /* x86-64-v2.  */
-  if (!(CPU_FEATURE_USABLE (CMPXCHG16B)
-        && CPU_FEATURE_USABLE (LAHF64_SAHF64)
-        && CPU_FEATURE_USABLE (POPCNT)
-        && CPU_FEATURE_USABLE (SSE3)
-        && CPU_FEATURE_USABLE (SSE4_1)
-        && CPU_FEATURE_USABLE (SSE4_2)
-        && CPU_FEATURE_USABLE (SSSE3)))
+  if (!(isa_level & GNU_PROPERTY_X86_ISA_1_V2))
     return _dl_hwcaps_subdirs_build_bitmask (subdirs_count, active);
   ++active;
 
   /* x86-64-v3.  */
-  if (!(CPU_FEATURE_USABLE (AVX)
-        && CPU_FEATURE_USABLE (AVX2)
-        && CPU_FEATURE_USABLE (BMI1)
-        && CPU_FEATURE_USABLE (BMI2)
-        && CPU_FEATURE_USABLE (F16C)
-        && CPU_FEATURE_USABLE (FMA)
-        && CPU_FEATURE_USABLE (LZCNT)
-        && CPU_FEATURE_USABLE (MOVBE)
-        && CPU_FEATURE_USABLE (OSXSAVE)))
+  if (!(isa_level & GNU_PROPERTY_X86_ISA_1_V3))
     return _dl_hwcaps_subdirs_build_bitmask (subdirs_count, active);
   ++active;
 
- /* x86-64-v4.  */
-  if (!(CPU_FEATURE_USABLE (AVX512F)
-        && CPU_FEATURE_USABLE (AVX512BW)
-        && CPU_FEATURE_USABLE (AVX512CD)
-        && CPU_FEATURE_USABLE (AVX512DQ)
-        && CPU_FEATURE_USABLE (AVX512VL)))
+  /* x86-64-v4.  */
+  if (!(isa_level & GNU_PROPERTY_X86_ISA_1_V4))
     return _dl_hwcaps_subdirs_build_bitmask (subdirs_count, active);
   ++active;