Support "ah", "bh", "ch", "dh" on amd64.

gdb/

2010-04-01  H.J. Lu  <hongjiu.lu@intel.com>

	* amd64-tdep.c (amd64_byte_names): Add "ah", "bh", "ch", "dh".
	(AMD64_NUM_LOWER_BYTE_REGS): New.
	(amd64_pseudo_register_read): Handle "ah", "bh", "ch", "dh".
	(amd64_pseudo_register_write): Likewise.
	(amd64_init_abi): Set num_byte_regs to 20.

gdb/testsuite/

2010-04-01  H.J. Lu  <hongjiu.lu@intel.com>

	* gdb.arch/amd64-byte.exp: Check "ah", "bh", "ch", "dh".

4 files changed, 76 insertions, 14 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index a40533c..814a336 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,11 @@
+2010-04-01  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* amd64-tdep.c (amd64_byte_names): Add "ah", "bh", "ch", "dh".
+	(AMD64_NUM_LOWER_BYTE_REGS): New.
+	(amd64_pseudo_register_read): Handle "ah", "bh", "ch", "dh".
+	(amd64_pseudo_register_write): Likewise.
+	(amd64_init_abi): Set num_byte_regs to 20.
+
 2010-04-01  Pedro Alves  <pedro@codesourcery.com>
 
 	* breakpoint.c (multi_start, multi_end, last_was_multi): Delete.
diff --git a/gdb/amd64-tdep.c b/gdb/amd64-tdep.c
index e5cfa71..acab4ac 100644
--- a/gdb/amd64-tdep.c
+++ b/gdb/amd64-tdep.c
@@ -215,9 +215,13 @@ amd64_arch_reg_to_regnum (int reg)
 static const char *amd64_byte_names[] =
 {
   "al", "bl", "cl", "dl", "sil", "dil", "bpl", "spl",
-  "r8l", "r9l", "r10l", "r11l", "r12l", "r13l", "r14l", "r15l"
+  "r8l", "r9l", "r10l", "r11l", "r12l", "r13l", "r14l", "r15l",
+  "ah", "bh", "ch", "dh"
 };
 
+/* Number of lower byte registers.  */
+#define AMD64_NUM_LOWER_BYTE_REGS 16
+
 /* Register names for word pseudo-registers.  */
 
 static const char *amd64_word_names[] =
@@ -263,8 +267,18 @@ amd64_pseudo_register_read (struct gdbarch *gdbarch,
       int gpnum = regnum - tdep->al_regnum;
 
       /* Extract (always little endian).  */
-      regcache_raw_read (regcache, gpnum, raw_buf);
-      memcpy (buf, raw_buf, 1);
+      if (gpnum >= AMD64_NUM_LOWER_BYTE_REGS)
+	{
+	  /* Special handling for AH, BH, CH, DH.  */
+	  regcache_raw_read (regcache,
+			     gpnum - AMD64_NUM_LOWER_BYTE_REGS, raw_buf);
+	  memcpy (buf, raw_buf + 1, 1);
+	}
+      else
+	{
+	  regcache_raw_read (regcache, gpnum, raw_buf);
+	  memcpy (buf, raw_buf, 1);
+	}
     }
   else if (i386_dword_regnum_p (gdbarch, regnum))
     {
@@ -289,12 +303,26 @@ amd64_pseudo_register_write (struct gdbarch *gdbarch,
     {
       int gpnum = regnum - tdep->al_regnum;
 
-      /* Read ...  */
-      regcache_raw_read (regcache, gpnum, raw_buf);
-      /* ... Modify ... (always little endian).  */
-      memcpy (raw_buf, buf, 1);
-      /* ... Write.  */
-      regcache_raw_write (regcache, gpnum, raw_buf);
+      if (gpnum >= AMD64_NUM_LOWER_BYTE_REGS)
+	{
+	  /* Read ... AH, BH, CH, DH.  */
+	  regcache_raw_read (regcache,
+			     gpnum - AMD64_NUM_LOWER_BYTE_REGS, raw_buf);
+	  /* ... Modify ... (always little endian).  */
+	  memcpy (raw_buf + 1, buf, 1);
+	  /* ... Write.  */
+	  regcache_raw_write (regcache,
+			      gpnum - AMD64_NUM_LOWER_BYTE_REGS, raw_buf);
+	}
+      else
+	{
+	  /* Read ...  */
+	  regcache_raw_read (regcache, gpnum, raw_buf);
+	  /* ... Modify ... (always little endian).  */
+	  memcpy (raw_buf, buf, 1);
+	  /* ... Write.  */
+	  regcache_raw_write (regcache, gpnum, raw_buf);
+	}
     }
   else if (i386_dword_regnum_p (gdbarch, regnum))
     {
@@ -2228,7 +2256,7 @@ amd64_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   tdep->num_core_regs = AMD64_NUM_GREGS + I387_NUM_REGS;
   tdep->register_names = amd64_register_names;
 
-  tdep->num_byte_regs = 16;
+  tdep->num_byte_regs = 20;
   tdep->num_word_regs = 16;
   tdep->num_dword_regs = 16;
   /* Avoid wiring in the MMX registers for now.  */
diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 61f6193..c16e672 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,7 @@
+2010-04-01  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* gdb.arch/amd64-byte.exp: Check "ah", "bh", "ch", "dh".
+
 2010-04-01  Pedro Alves  <pedro@codesourcery.com>
 
 	* gdb.base/commands.exp: Adjust.
diff --git a/gdb/testsuite/gdb.arch/amd64-byte.exp b/gdb/testsuite/gdb.arch/amd64-byte.exp
index 9a14099..c76876b 100644
--- a/gdb/testsuite/gdb.arch/amd64-byte.exp
+++ b/gdb/testsuite/gdb.arch/amd64-byte.exp
@@ -52,7 +52,6 @@ if ![runto_main] then {
     gdb_suppress_tests
 }
 
-set nr_regs 14
 set byte_regs(1) al
 set byte_regs(2) bl
 set byte_regs(3) cl
@@ -67,6 +66,10 @@ set byte_regs(11) r12l
 set byte_regs(12) r13l
 set byte_regs(13) r14l
 set byte_regs(14) r15l
+set byte_regs(15) ah
+set byte_regs(16) bh
+set byte_regs(17) ch
+set byte_regs(18) dh
 
 gdb_test "break [gdb_get_line_number "first breakpoint here"]" \
          "Breakpoint .* at .*${srcfile}.*" \
@@ -79,12 +82,19 @@ for { set r 1 } { $r <= 6  } { incr r } {
         "check contents of %$byte_regs($r)"
 }
 
+for { set r 1 } { $r <= 4  } { incr r } {
+    set h [expr $r + 14]
+    gdb_test "print/x \$$byte_regs($h)" \
+        ".. = 0x[format %x $r]2" \
+        "check contents of %$byte_regs($h)"
+}
+
 gdb_test "break [gdb_get_line_number "second breakpoint here"]" \
          "Breakpoint .* at .*${srcfile}.*" \
          "set second breakpoint in main"
 gdb_continue_to_breakpoint "continue to second breakpoint in main"
 
-for { set r 7 } { $r <= $nr_regs  } { incr r } {
+for { set r 7 } { $r <= 14  } { incr r } {
     gdb_test "print/x \$$byte_regs($r)" \
         ".. = 0x[format %x $r]1" \
         "check contents of %$byte_regs($r)"
@@ -94,6 +104,11 @@ for { set r 1 } { $r <= 6  } { incr r } {
   gdb_test "set var \$$byte_regs($r) = $r" "" "set %$byte_regs($r)"
 }
 
+for { set r 1 } { $r <= 4  } { incr r } {
+  set h [expr $r + 14]
+  gdb_test "set var \$$byte_regs($h) = $h" "" "set %$byte_regs($h)"
+}
+
 gdb_test "break [gdb_get_line_number "third breakpoint here"]" \
          "Breakpoint .* at .*${srcfile}.*" \
          "set third breakpoint in main"
@@ -105,7 +120,14 @@ for { set r 1 } { $r <= 6  } { incr r } {
         "check contents of %$byte_regs($r)"
 }
 
-for { set r 7 } { $r <= $nr_regs  } { incr r } {
+for { set r 1 } { $r <= 4  } { incr r } {
+    set h [expr $r + 14]
+    gdb_test "print \$$byte_regs($h)" \
+        ".. = $h" \
+        "check contents of %$byte_regs($h)"
+}
+
+for { set r 7 } { $r <= 14  } { incr r } {
   gdb_test "set var \$$byte_regs($r) = $r" "" "set %$byte_regs($r)"
 }
 
@@ -114,7 +136,7 @@ gdb_test "break [gdb_get_line_number "forth breakpoint here"]" \
          "set forth breakpoint in main"
 gdb_continue_to_breakpoint "continue to forth breakpoint in main"
 
-for { set r 7 } { $r <= $nr_regs  } { incr r } {
+for { set r 7 } { $r <= 14  } { incr r } {
     gdb_test "print \$$byte_regs($r)" \
         ".. = $r" \
         "check contents of %$byte_regs($r)"