linux-user: Add AT_HWCAP2 for aarch64-linux-user

Add the HWCAP2_* bits from kernel version v5.3-rc3.
Enable the bits corresponding to ARMv8.5-CondM and ARMv8.5-FRINT.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20190809171156.3476-1-richard.henderson@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

linux-user/elfload.c

@@ -607,9 +607,23 @@ enum {
     ARM_HWCAP_A64_SB            = 1 << 29,
     ARM_HWCAP_A64_PACA          = 1 << 30,
     ARM_HWCAP_A64_PACG          = 1UL << 31,
+
+    ARM_HWCAP2_A64_DCPODP       = 1 << 0,
+    ARM_HWCAP2_A64_SVE2         = 1 << 1,
+    ARM_HWCAP2_A64_SVEAES       = 1 << 2,
+    ARM_HWCAP2_A64_SVEPMULL     = 1 << 3,
+    ARM_HWCAP2_A64_SVEBITPERM   = 1 << 4,
+    ARM_HWCAP2_A64_SVESHA3      = 1 << 5,
+    ARM_HWCAP2_A64_SVESM4       = 1 << 6,
+    ARM_HWCAP2_A64_FLAGM2       = 1 << 7,
+    ARM_HWCAP2_A64_FRINT        = 1 << 8,
 };
 
-#define ELF_HWCAP get_elf_hwcap()
+#define ELF_HWCAP   get_elf_hwcap()
+#define ELF_HWCAP2  get_elf_hwcap2()
+
+#define GET_FEATURE_ID(feat, hwcap) \
+    do { if (cpu_isar_feature(feat, cpu)) { hwcaps |= hwcap; } } while (0)
 
 static uint32_t get_elf_hwcap(void)
 {
@@ -621,8 +635,6 @@ static uint32_t get_elf_hwcap(void)
     hwcaps |= ARM_HWCAP_A64_CPUID;
 
     /* probe for the extra features */
-#define GET_FEATURE_ID(feat, hwcap) \
-    do { if (cpu_isar_feature(feat, cpu)) { hwcaps |= hwcap; } } while (0)
 
     GET_FEATURE_ID(aa64_aes, ARM_HWCAP_A64_AES);
     GET_FEATURE_ID(aa64_pmull, ARM_HWCAP_A64_PMULL);
@@ -645,11 +657,22 @@ static uint32_t get_elf_hwcap(void)
     GET_FEATURE_ID(aa64_sb, ARM_HWCAP_A64_SB);
     GET_FEATURE_ID(aa64_condm_4, ARM_HWCAP_A64_FLAGM);
 
-#undef GET_FEATURE_ID
+    return hwcaps;
+}
+
+static uint32_t get_elf_hwcap2(void)
+{
+    ARMCPU *cpu = ARM_CPU(thread_cpu);
+    uint32_t hwcaps = 0;
+
+    GET_FEATURE_ID(aa64_condm_5, ARM_HWCAP2_A64_FLAGM2);
+    GET_FEATURE_ID(aa64_frint, ARM_HWCAP2_A64_FRINT);
 
     return hwcaps;
 }
 
+#undef GET_FEATURE_ID
+
 #endif /* not TARGET_AARCH64 */
 #endif /* TARGET_ARM */