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[01/41] linux-user/sparc: Add more hwcap bits for sparc64

Message ID 20240302051601.53649-2-richard.henderson@linaro.org (mailing list archive)
State New, archived
Headers show
Series target/sparc: Implement VIS4 | expand

Commit Message

Richard Henderson March 2, 2024, 5:15 a.m. UTC 
Supply HWCAP_SPARC_V8PLUS, HWCAP_SPARC_MUL32, HWCAP_SPARC_DIV32,
HWCAP_SPARC_POPC, HWCAP_SPARC_FSMULD, HWCAP_SPARC_VIS, HWCAP_SPARC_VIS2.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 linux-user/elfload.c | 48 +++++++++++++++++++++++++++++++-------------
 1 file changed, 34 insertions(+), 14 deletions(-)
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Patch

diff --git a/linux-user/elfload.c b/linux-user/elfload.c
index b8eef893d0..6041270f1c 100644
--- a/linux-user/elfload.c
+++ b/linux-user/elfload.c
@@ -963,24 +963,44 @@  const char *elf_hwcap2_str(uint32_t bit)
 #endif /* TARGET_ARM */
 
 #ifdef TARGET_SPARC
-#ifdef TARGET_SPARC64
 
-#define ELF_HWCAP  (HWCAP_SPARC_FLUSH | HWCAP_SPARC_STBAR | HWCAP_SPARC_SWAP \
-                    | HWCAP_SPARC_MULDIV | HWCAP_SPARC_V9)
-#ifndef TARGET_ABI32
-#define elf_check_arch(x) ( (x) == EM_SPARCV9 || (x) == EM_SPARC32PLUS )
+#ifndef TARGET_SPARC64
+# define ELF_CLASS  ELFCLASS32
+# define ELF_ARCH   EM_SPARC
+#elif defined(TARGET_ABI32)
+# define ELF_CLASS  ELFCLASS32
+# define elf_check_arch(x) ((x) == EM_SPARC32PLUS || (x) == EM_SPARC)
 #else
-#define elf_check_arch(x) ( (x) == EM_SPARC32PLUS || (x) == EM_SPARC )
+# define ELF_CLASS  ELFCLASS64
+# define ELF_ARCH   EM_SPARCV9
 #endif
 
-#define ELF_CLASS   ELFCLASS64
-#define ELF_ARCH    EM_SPARCV9
-#else
-#define ELF_HWCAP  (HWCAP_SPARC_FLUSH | HWCAP_SPARC_STBAR | HWCAP_SPARC_SWAP \
-                    | HWCAP_SPARC_MULDIV)
-#define ELF_CLASS   ELFCLASS32
-#define ELF_ARCH    EM_SPARC
-#endif /* TARGET_SPARC64 */
+#include "elf.h"
+
+#define ELF_HWCAP get_elf_hwcap()
+
+static uint32_t get_elf_hwcap(void)
+{
+    /* There are not many sparc32 hwcap bits -- we have all of them. */
+    uint32_t r = HWCAP_SPARC_FLUSH | HWCAP_SPARC_STBAR |
+                 HWCAP_SPARC_SWAP | HWCAP_SPARC_MULDIV;
+
+#ifdef TARGET_SPARC64
+    CPUSPARCState *env = cpu_env(thread_cpu);
+    uint32_t features = env->def.features;
+
+    r |= HWCAP_SPARC_V9 | HWCAP_SPARC_V8PLUS;
+    /* 32x32 multiply and divide are efficient. */
+    r |= HWCAP_SPARC_MUL32 | HWCAP_SPARC_DIV32;
+    /* We don't have an internal feature bit for this. */
+    r |= HWCAP_SPARC_POPC;
+    r |= features & CPU_FEATURE_FSMULD ? HWCAP_SPARC_FSMULD : 0;
+    r |= features & CPU_FEATURE_VIS1 ? HWCAP_SPARC_VIS : 0;
+    r |= features & CPU_FEATURE_VIS2 ? HWCAP_SPARC_VIS2 : 0;
+#endif
+
+    return r;
+}
 
 static inline void init_thread(struct target_pt_regs *regs,
                                struct image_info *infop)