Revert "gdbserver: update target description creation for x86/linux"

This reverts commit 61bb321605fc74703adc994fd7a78e9d2495ca7a.

1 files changed, 18 insertions, 5 deletions

diff --git a/gdbserver/linux-i386-ipa.cc b/gdbserver/linux-i386-ipa.cc
index 246bcb9..459b805 100644
--- a/gdbserver/linux-i386-ipa.cc
+++ b/gdbserver/linux-i386-ipa.cc
@@ -246,15 +246,28 @@ initialize_fast_tracepoint_trampoline_buffer (void)
     }
 }
 
+/* Map the tdesc index to xcr0 mask.  */
+static uint64_t idx2mask[X86_TDESC_LAST] = {
+  X86_XSTATE_X87_MASK,
+  X86_XSTATE_SSE_MASK,
+  X86_XSTATE_AVX_MASK,
+  X86_XSTATE_MPX_MASK,
+  X86_XSTATE_AVX_MPX_MASK,
+  X86_XSTATE_AVX_AVX512_MASK,
+  X86_XSTATE_AVX_MPX_AVX512_PKU_MASK,
+};
+
 /* Return target_desc to use for IPA, given the tdesc index passed by
    gdbserver.  */
 
 const struct target_desc *
 get_ipa_tdesc (int idx)
 {
-  uint64_t xcr0 = x86_linux_tdesc_idx_to_xcr0 (idx);
-
-  return i386_linux_read_description (xcr0);
+  if (idx >= X86_TDESC_LAST)
+    {
+      internal_error ("unknown ipa tdesc index: %d", idx);
+    }
+  return i386_linux_read_description (idx2mask[idx]);
 }
 
 /* Allocate buffer for the jump pads.  On i386, we can reach an arbitrary
@@ -276,6 +289,6 @@ void
 initialize_low_tracepoint (void)
 {
   initialize_fast_tracepoint_trampoline_buffer ();
-  for (auto i = 0; i < x86_linux_i386_ipa_tdesc_count (); i++)
-    i386_linux_read_description (x86_linux_tdesc_idx_to_xcr0 (i));
+  for (auto i = 0; i < X86_TDESC_LAST; i++)
+    i386_linux_read_description (idx2mask[i]);
 }