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

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(HANDLE_ALIGN): New.
This commit is contained in:
Alexandre Oliva 2004-05-07 06:28:04 +00:00
parent bfbdcf0474
commit daeea9904e
2 changed files with 46 additions and 0 deletions
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5
gas/ChangeLog
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@ -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.

41
gas/config/tc-frv.h
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@ -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)