Changeset 48990 in vbox

Timestamp:

Oct 9, 2013 9:37:16 AM (11 years ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

89710

Message:

Runtime: ASMGetSegAttr.

Location:

trunk

Files:

trunk/include/iprt/asm-amd64-x86.h

-              r48572
+              r48990
 /**
+ * Get the access rights for the segment selector.
+ *
+ * @returns The access rights on success or ~0U on failure.
+ * @param   uSel        The selector value.
+ *
+ * @remarks Using ~0U for failure is chosen because valid access rights always
+ *          have bits 0:7 as 0 (on both Intel & AMD).
+ */
+#if RT_INLINE_ASM_EXTERNAL
+DECLASM(uint32_t) ASMGetSegAttr(RTSEL uSel);
+#else
+DECLINLINE(uint32_t) ASMGetSegAttr(RTSEL uSel)
+{
+    uint32_t uAttr;
+    /* LAR only accesses 16-bit of the source operand, but eax for the
+       destination operand is required for getting the full 32-bit access rights. */
+# if RT_INLINE_ASM_GNU_STYLE
+    __asm__ __volatile__("mov %1, %%ax\n\t"
+                         "larl %%eax, %0\n\t"
+                         "jz done%=\n\t"
+                         "movl $0xffffffff, %0\n\t"
+                         "done%=:\n\t"
+                         : "=r" (uAttr)
+                         : "r" (uSel)
+                         : "cc", "%eax");
+# else
+    __asm
+    {
+        mov     ax, [uSel]
+        larl    [uAttr], eax
+        jz      done
+        mov     [uAttr], ~0h
+        done:
+    }
+# endif
+    return uAttr;
+}
+#endif
+/**
  * Get the [RE]FLAGS register.
  * @returns [RE]FLAGS.

-              r48902
+              r48990
         common/asm/ASMGetGDTR.asm \
         common/asm/ASMGetLDTR.asm \
+        common/asm/ASMGetSegAttr.asm \
         common/asm/ASMGetTR.asm
 …
         common/asm/ASMAtomicCmpXchgU8.asm \
         common/asm/ASMMultU64ByU32DivByU32.asm \
+        common/asm/ASMCpuId_Idx_ECX.asm
+        common/asm/ASMCpuId_Idx_ECX.asm \
+        common/asm/ASMGetSegAttr.asm
+#

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