From 46a1ee4f397ffd305da95fb65dc73be49667ff6d Mon Sep 17 00:00:00 2001
From: James Cowgill <james.cowgill@mips.com>
Date: Thu, 15 Mar 2018 15:13:48 +0000
Subject: [PATCH] linux-user: implement HWCAP bits on MIPS
Add support for the two currently defined HWCAP bits on MIPS - R6 and
MSA.
Buglink: https://bugs.launchpad.net/qemu/+bug/1754372
Signed-off-by: James Cowgill <james.cowgill@mips.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20180315151348.6451-1-james.cowgill@mips.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
---
linux-user/elfload.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/linux-user/elfload.c b/linux-user/elfload.c
index 23e34957f91..c77ed1bb01e 100644
--- a/linux-user/elfload.c
+++ b/linux-user/elfload.c
@@ -882,6 +882,30 @@ static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUMIPSState *e
#define USE_ELF_CORE_DUMP
#define ELF_EXEC_PAGESIZE 4096
+/* See arch/mips/include/uapi/asm/hwcap.h. */
+enum {
+ HWCAP_MIPS_R6 = (1 << 0),
+ HWCAP_MIPS_MSA = (1 << 1),
+};
+
+#define ELF_HWCAP get_elf_hwcap()
+
+static uint32_t get_elf_hwcap(void)
+{
+ MIPSCPU *cpu = MIPS_CPU(thread_cpu);
+ uint32_t hwcaps = 0;
+
+#define GET_FEATURE(flag, hwcap) \
+ do { if (cpu->env.insn_flags & (flag)) { hwcaps |= hwcap; } } while (0)
+
+ GET_FEATURE(ISA_MIPS32R6 | ISA_MIPS64R6, HWCAP_MIPS_R6);
+ GET_FEATURE(ASE_MSA, HWCAP_MIPS_MSA);
+
+#undef GET_FEATURE
+
+ return hwcaps;
+}
+
#endif /* TARGET_MIPS */
#ifdef TARGET_MICROBLAZE
--
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