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MIPS: elf_hwcap: Export userspace ASEs

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commit 38dffe1e4d upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiaxun Yang 2019-10-10 23:01:57 +08:00 committed by Greg Kroah-Hartman
parent aaa81d9e65
commit 34ab38cd80
2 changed files with 44 additions and 0 deletions
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11
arch/mips/include/uapi/asm/hwcap.h
View File

@ -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 */

33
arch/mips/kernel/cpu-probe.c
View File

@ -2105,6 +2105,39 @@ 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);