progs/perftest.c: Use from Glibc syscall numbers.

[catacomb] / base / dispatch-x86ish.S

diff --git a/base/dispatch-x86ish.S b/base/dispatch-x86ish.S
index 57d8d32..67ec05e 100644 (file)
--- a/base/dispatch-x86ish.S
+++ b/base/dispatch-x86ish.S
@@ -44,30 +44,32 @@ FUNC(dispatch_x86ish_cpuid)
        // return zero if we can; otherwise fill with zero and return -1.
 
 #if CPUFAM_X86
+#  define OUT edi
        pushreg ebx
        pushreg edi
-       mov     edi, [SP + 12]
+       mov     OUT, [SP + 12]
        mov     eax, [SP + 16]
        mov     ecx, [SP + 20]
-#  define OUT edi
 #endif
 #if CPUFAM_AMD64 && ABI_SYSV
+#  define OUT rdi
        pushreg rbx
        mov     eax, esi
        mov     ecx, edx
-#  define OUT rdi
 #endif
 #if CPUFAM_AMD64 && ABI_WIN
+#  define OUT r9
        pushreg rbx
-       mov     r9, rcx
+       mov     OUT, rcx
        mov     eax, edx
        mov     ecx, r8d
-#  define OUT r9
 #endif
   endprologue
 
        // First, check that this is even a thing, using the complicated
-       // dance with the flags register.
+       // dance with the flags register.  This is unnecessary on AMD64,
+       // which postdates the introduction of `cpuid'.
+#if CPUFAM_X86
        pushf
        pop     DX                      // current flags in d
 
@@ -86,6 +88,7 @@ FUNC(dispatch_x86ish_cpuid)
        pop     DX
        test    edx, EFLAGS_ID
        jnz     8f
+#endif
 
        // OK, that seemed to work.
        cpuid
@@ -108,6 +111,7 @@ FUNC(dispatch_x86ish_cpuid)
        ret
 
        // Failed.
+#if CPUFAM_X86
 8:     xor     eax, eax
        mov     [OUT + 0], eax
        mov     [OUT + 4], eax
@@ -115,6 +119,9 @@ FUNC(dispatch_x86ish_cpuid)
        mov     [OUT + 12], eax
        mov     eax, -1
        jmp     9b
+#endif
+
+#undef OUT
 ENDFUNC
 
 ///--------------------------------------------------------------------------
@@ -155,6 +162,43 @@ FUNC(dispatch_x86ish_xmmregisters_p)
 ENDFUNC
 
 ///--------------------------------------------------------------------------
+/// Checking extended control registers.
+
+FUNC(dispatch_x86ish_xgetbv)
+       // Call with two arguments: a pointer Z_OUT to 8 bytes of output space, and
+       // a 32-bit integer C.  Read the 64-bit value of XCR(C), and store it
+       // at Z_OUT.
+
+#if CPUFAM_X86
+#  define Z_OUT edi
+       pushreg edi
+       mov     Z_OUT, [esp + 8]
+       mov     ecx, [esp + 12]
+#endif
+#if CPUFAM_AMD64 && ABI_SYSV
+#  define Z_OUT rdi
+       mov     ecx, esi
+#endif
+#if CPUFAM_AMD64 && ABI_WIN
+#  define Z_OUT r8
+       mov     r8, rcx
+       mov     ecx, edx
+#endif
+  endprologue
+
+       xgetbv
+       mov     [Z_OUT + 0], eax
+       mov     [Z_OUT + 4], edx
+
+#if CPUFAM_X86
+       popreg  edi
+#endif
+       ret
+
+#undef Z_OUT
+ENDFUNC
+
+///--------------------------------------------------------------------------
 /// Checking `rdrand'.
 
 FUNC(dispatch_x86ish_rdrand)