diff options
Diffstat (limited to 'gas/config/tc-frv.h')
| -rw-r--r-- | gas/config/tc-frv.h | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/gas/config/tc-frv.h b/gas/config/tc-frv.h index 8bc3c7c..fb887a0 100644 --- 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) |