Support i386 without SSE.

gdb/

2010-04-08  H.J. Lu  <hongjiu.lu@intel.com>

	* i386-linux-nat.c (have_ptrace_getfpxregs): Initialize to -1
	if HAVE_PTRACE_GETFPXREGS is defined.
	(i386_linux_read_description): Set have_ptrace_getfpxregs and
	have_ptrace_getregset to 0 if ptrace PTRACE_GETFPXREGS failed.

	* i386-linux-tdep.c: Include "features/i386/i386-mmx-linux.c"
	(i386_linux_core_read_description): Return tdesc_i386_mmx_linux
	if .reg-xfp section doesn't exist.
	(_initialize_i386_linux_tdep): Call initialize_tdesc_i386_mmx_linux.

	* i386-linux-tdep.h (tdesc_i386_mmx_linux): New.

	* i386-tdep.c: Include "features/i386/i386-mmx.c".
	(i386_go32_init_abi): Set tdesc to tdesc_i386_mmx.
	(i386_validate_tdesc_p): Make org.gnu.gdb.i386.sse optional.  Set
	xcr0 to I386_XSTATE_X87_MASK if SSE isn't available.
	(i386_gdbarch_init): Update comments.
	(_initialize_i386_tdep): Call initialize_tdesc_i386_mmx.

	* common/i386-xstate.h (I386_XSTATE_X87_MASK): New.

	* config/djgpp/fnchange.lst: Add i386 MMX XML files.

	* features/Makefile (i386/i386-mmx-expedite): New.
	(i386/i386-mmx-linux-expedite): Likewise.
	($(outdir)/i386/i386-mmx.dat): Likewise.
	($(outdir)/i386/i386-mmx-linux.dat): Likewise.

	* features/i386/i386-mmx-linux.c: New.
	* features/i386/i386-mmx-linux.xml: Likewise.
	* features/i386/i386-mmx.c: Likewise.
	* features/i386/i386-mmx.xml: Likewise.
	* regformats/i386/i386-mmx-linux.dat: Likewise.
	* regformats/i386/i386-mmx.dat: Likewise.

	* features/Makefile (WHICH): Add i386/i386-mmx and
	i386/i386-mmx-linux.

gdb/doc/

2010-04-08  H.J. Lu  <hongjiu.lu@intel.com>

	* gdb.texinfo (i386 Features): Make org.gnu.gdb.i386.avx
	optional.  Make org.gnu.gdb.i386.avx requires
	org.gnu.gdb.i386.avx.

gdb/gdbserver/

2010-04-08  H.J. Lu  <hongjiu.lu@intel.com>

	* Makefile.in (clean): Also remove i386-mmx.c i386-mmx-linux.c.
	(i386-mmx.o): New.
	(i386-mmx.c): Likewise.
	(i386-mmx-linux.o): Likewise.
	(i386-mmx-linux.c): Likewise.

	* configure.srv (srv_i386_regobj): Add i386-mmx.o.
	(srv_i386_linux_regobj): Add i386-mmx-linux.o.
	(srv_i386_xmlfiles): Add i386/i386-mmx.xml.
	(srv_i386_linux_xmlfiles): Add i386/i386-mmx-linux.xml.

	* linux-x86-low.c (init_registers_i386_mmx_linux): New.
	(x86_linux_update_xmltarget): Call init_registers_i386_mmx_linux
	and return if ptrace PTRACE_GETFPXREGS failed in 32bit.

1 files changed, 25 insertions, 20 deletions

diff --git a/gdb/i386-tdep.c b/gdb/i386-tdep.c
index 9e0f61f..22854bd 100644
--- a/gdb/i386-tdep.c
+++ b/gdb/i386-tdep.c
@@ -58,6 +58,7 @@
 
 #include "features/i386/i386.c"
 #include "features/i386/i386-avx.c"
+#include "features/i386/i386-mmx.c"
 
 /* Register names.  */
 
@@ -2937,8 +2938,8 @@ i386_go32_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   tdep->jb_pc_offset = 36;
 
   /* DJGPP does not support the SSE registers.  */
-  tdep->num_xmm_regs = 0;
-  set_gdbarch_num_regs (gdbarch, I386_NUM_GREGS + I387_NUM_REGS);
+  if (! tdesc_has_registers (info.target_desc))
+    tdep->tdesc = tdesc_i386_mmx;
 
   /* Native compiler is GCC, which uses the SVR4 register numbering
      even in COFF and STABS.  See the comment in i386_gdbarch_init,
@@ -6649,13 +6650,12 @@ i386_validate_tdesc_p (struct gdbarch_tdep *tdep,
 
   /* Get core registers.  */
   feature_core = tdesc_find_feature (tdesc, "org.gnu.gdb.i386.core");
+  if (feature_core == NULL)
+    return 0;
 
   /* Get SSE registers.  */
   feature_sse = tdesc_find_feature (tdesc, "org.gnu.gdb.i386.sse");
 
-  if (feature_core == NULL || feature_sse == NULL)
-    return 0;
-
   /* Try AVX registers.  */
   feature_avx = tdesc_find_feature (tdesc, "org.gnu.gdb.i386.avx");
 
@@ -6664,6 +6664,10 @@ i386_validate_tdesc_p (struct gdbarch_tdep *tdep,
   /* The XCR0 bits.  */
   if (feature_avx)
     {
+      /* AVX register description requires SSE register description.  */
+      if (!feature_sse)
+	return 0;
+
       tdep->xcr0 = I386_XSTATE_AVX_MASK;
 
       /* It may have been set by OSABI initialization function.  */
@@ -6679,19 +6683,27 @@ i386_validate_tdesc_p (struct gdbarch_tdep *tdep,
 					    tdep->ymm0h_regnum + i,
 					    tdep->ymmh_register_names[i]);
     }
-  else
+  else if (feature_sse)
     tdep->xcr0 = I386_XSTATE_SSE_MASK;
+  else
+    {
+      tdep->xcr0 = I386_XSTATE_X87_MASK;
+      tdep->num_xmm_regs = 0;
+    }
 
   num_regs = tdep->num_core_regs;
   for (i = 0; i < num_regs; i++)
     valid_p &= tdesc_numbered_register (feature_core, tdesc_data, i,
 					tdep->register_names[i]);
 
-  /* Need to include %mxcsr, so add one.  */
-  num_regs += tdep->num_xmm_regs + 1;
-  for (; i < num_regs; i++)
-    valid_p &= tdesc_numbered_register (feature_sse, tdesc_data, i,
-					tdep->register_names[i]);
+  if (feature_sse)
+    {
+      /* Need to include %mxcsr, so add one.  */
+      num_regs += tdep->num_xmm_regs + 1;
+      for (; i < num_regs; i++)
+	valid_p &= tdesc_numbered_register (feature_sse, tdesc_data, i,
+					    tdep->register_names[i]);
+    }
 
   return valid_p;
 }
@@ -6732,15 +6744,7 @@ i386_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
      and the SSE registers.  This can be overridden for a specific ABI
      by adjusting the members `st0_regnum', `mm0_regnum' and
      `num_xmm_regs' of `struct gdbarch_tdep', otherwise the registers
-     will show up in the output of "info all-registers".  Ideally we
-     should try to autodetect whether they are available, such that we
-     can prevent "info all-registers" from displaying registers that
-     aren't available.
-
-     NOTE: kevinb/2003-07-13: ... if it's a choice between printing
-     [the SSE registers] always (even when they don't exist) or never
-     showing them to the user (even when they do exist), I prefer the
-     former over the latter.  */
+     will show up in the output of "info all-registers".  */
 
   tdep->st0_regnum = I386_ST0_REGNUM;
 
@@ -7039,6 +7043,7 @@ is \"default\"."),
 
   /* Initialize the standard target descriptions.  */
   initialize_tdesc_i386 ();
+  initialize_tdesc_i386_mmx ();
   initialize_tdesc_i386_avx ();
 
   /* Tell remote stub that we support XML target description.  */