MIPS: elf_hwcap: Export userspace ASEs

A Golang developer reported MIPS hwcap isn't reflecting instructions
that the processor actually supported so programs can't apply optimized
code at runtime.

Thus we export the ASEs that can be used in userspace programs.

Reported-by: Meng Zhuo <mengzhuo1203@gmail.com>
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: linux-mips@vger.kernel.org
Cc: Paul Burton <paul.burton@mips.com>
Cc: <stable@vger.kernel.org> # 4.14+
Signed-off-by: Paul Burton <paul.burton@mips.com>

2 files changed, 44 insertions, 0 deletions

diff --git a/arch/mips/include/uapi/asm/hwcap.h b/arch/mips/include/uapi/asm/hwcap.h
index a2aba4b059e6..1ade1daa4921 100644
--- a/arch/mips/include/uapi/asm/hwcap.h
+++ b/arch/mips/include/uapi/asm/hwcap.h
@@ -6,5 +6,16 @@
 #define HWCAP_MIPS_R6           (1 << 0)
 #define HWCAP_MIPS_MSA          (1 << 1)
 #define HWCAP_MIPS_CRC32        (1 << 2)
+#define HWCAP_MIPS_MIPS16       (1 << 3)
+#define HWCAP_MIPS_MDMX     (1 << 4)
+#define HWCAP_MIPS_MIPS3D   (1 << 5)
+#define HWCAP_MIPS_SMARTMIPS (1 << 6)
+#define HWCAP_MIPS_DSP      (1 << 7)
+#define HWCAP_MIPS_DSP2     (1 << 8)
+#define HWCAP_MIPS_DSP3     (1 << 9)
+#define HWCAP_MIPS_MIPS16E2 (1 << 10)
+#define HWCAP_LOONGSON_MMI  (1 << 11)
+#define HWCAP_LOONGSON_EXT  (1 << 12)
+#define HWCAP_LOONGSON_EXT2 (1 << 13)
 
 #endif /* _UAPI_ASM_HWCAP_H */
diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index c2eb392597bf..f521cbf934e7 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -2180,6 +2180,39 @@ void cpu_probe(void)
                 elf_hwcap |= HWCAP_MIPS_MSA;
         }
 
+        if (cpu_has_mips16)
+                elf_hwcap |= HWCAP_MIPS_MIPS16;
+
+        if (cpu_has_mdmx)
+                elf_hwcap |= HWCAP_MIPS_MDMX;
+
+        if (cpu_has_mips3d)
+                elf_hwcap |= HWCAP_MIPS_MIPS3D;
+
+        if (cpu_has_smartmips)
+                elf_hwcap |= HWCAP_MIPS_SMARTMIPS;
+
+        if (cpu_has_dsp)
+                elf_hwcap |= HWCAP_MIPS_DSP;
+
+        if (cpu_has_dsp2)
+                elf_hwcap |= HWCAP_MIPS_DSP2;
+
+        if (cpu_has_dsp3)
+                elf_hwcap |= HWCAP_MIPS_DSP3;
+
+        if (cpu_has_mips16e2)
+                elf_hwcap |= HWCAP_MIPS_MIPS16E2;
+
+        if (cpu_has_loongson_mmi)
+                elf_hwcap |= HWCAP_LOONGSON_MMI;
+
+        if (cpu_has_loongson_ext)
+                elf_hwcap |= HWCAP_LOONGSON_EXT;
+
+        if (cpu_has_loongson_ext2)
+                elf_hwcap |= HWCAP_LOONGSON_EXT2;
+
         if (cpu_has_vz)
                 cpu_probe_vz(c);