* config/tc-frv.h (MAX_MEM_FOR_RS_ALIGN_CODE): New.

(HANDLE_ALIGN): New.

diff --git a/gas/ChangeLog b/gas/ChangeLog
index 203b958d9dde965fdce60c70e94a4d16a963854b..adae2a59a132ef824407d27191b61c503b435189 100644 (file)
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,8 @@
+2004-05-07  Alexandre Oliva  <aoliva@redhat.com>
+
+       * config/tc-frv.h (MAX_MEM_FOR_RS_ALIGN_CODE): New.
+       (HANDLE_ALIGN): New.
+
 2004-05-06  Daniel Jacobowitz  <dan@debian.org>
 
        * Makefile.am (DIST_SUBDIRS): Define.

diff --git a/gas/config/tc-frv.h b/gas/config/tc-frv.h
index 8bc3c7c29790992dd150259336fcc0ce89e1e268..fb887a0d35332f92eb9e7ce6416e195ded77403c 100644 (file)
--- a/gas/config/tc-frv.h
+++ b/gas/config/tc-frv.h
@@ -86,3 +86,44 @@ extern long md_pcrel_from_section PARAMS ((struct fix *, segT));
    for any relocations that pic won't support.  */
 #define tc_frob_file() frv_frob_file ()
 extern void frv_frob_file      PARAMS ((void));
+
+/* We don't want 0x00 for code alignment because this generates `add.p
+   gr0, gr0, gr0' patterns.  Although it's fine as a nop instruction,
+   it has the VLIW packing bit set, which means if you have a bunch of
+   them in a row and attempt to execute them, you'll exceed the VLIW
+   capacity and fail.  This also gets GDB confused sometimes, because
+   it won't set breakpoints in instructions other than the first of a
+   VLIW pack, so you used to be unable to set a breakpoint in the
+   initial instruction of a function that followed such
+   alignment-introduced instructions.
+
+   We could have arranged to emit `nop' instructions (0x80880000),
+   maybe even VLIW-pack sequences of nop instructions as much as
+   possible for the selected machine type, just in case the alignment
+   code actually happens to run, but this is probably too much effort
+   for little gain.  This code is not meant to be run anyway, so just
+   emit nops.  */
+#define MAX_MEM_FOR_RS_ALIGN_CODE (3 + 4)
+#define HANDLE_ALIGN(FRAGP) do                                         \
+  if ((FRAGP)->fr_type == rs_align_code)                               \
+    {                                                                  \
+      valueT count = ((FRAGP)->fr_next->fr_address                     \
+                     - ((FRAGP)->fr_address + (FRAGP)->fr_fix));       \
+      unsigned char *dest = (FRAGP)->fr_literal + (FRAGP)->fr_fix;     \
+      if ((count & 3) != 0)                                            \
+       {                                                               \
+         memset (dest, 0, (count & 3));                                \
+         (FRAGP)->fr_fix += (count & 3);                               \
+         dest += (count & 3);                                          \
+         count -= (count & 3);                                         \
+       }                                                               \
+      if (count)                                                       \
+       {                                                               \
+         (FRAGP)->fr_var = 4;                                          \
+         *dest++ = 0x80;                                               \
+         *dest++ = 0x88;                                               \
+         *dest++ = 0x00;                                               \
+         *dest++ = 0x00;                                               \
+       }                                                               \
+    }                                                                  \
+ while (0)