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* tc-i386.c (i386_align_code): Implement x86_64 neutral code fillers.

This commit is contained in:
Jan Hubicka 2002-07-16 22:31:19 +00:00
parent f7ef933922
commit 33fef721a1
2 changed files with 38 additions and 15 deletions
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4
gas/ChangeLog
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@ -1,3 +1,7 @@
Wed Jul 17 00:30:13 CEST 2002 Jan Hubicka <jh@suse.cz>
* tc-i386.c (i386_align_code): Implement x86_64 neutral code fillers.
2002-07-16 Moritz Jodeit <moritz@jodeit.org> 2002-07-16 Moritz Jodeit <moritz@jodeit.org>
* config/tc-z8k.c (build_bytes): Correct order of memset args. * config/tc-z8k.c (build_bytes): Correct order of memset args.

49
gas/config/tc-i386.c
View File

@ -521,26 +521,45 @@ i386_align_code (fragP, count)
f32_15, f32_15, f32_15, f32_15, f32_15, f32_15, f32_15 f32_15, f32_15, f32_15, f32_15, f32_15, f32_15, f32_15
}; };
/* ??? We can't use these fillers for x86_64, since they often kills the if (count <= 0 || count > 15)
upper halves. Solve later. */ return;
if (flag_code == CODE_64BIT)
count = 1;
if (count > 0 && count <= 15) /* The recommended way to pad 64bit code is to use NOPs preceded by
maximally four 0x66 prefixes. Balance the size of nops. */
if (flag_code == CODE_64BIT)
{ {
if (flag_code == CODE_16BIT) int i;
int nnops = (count + 3) / 4;
int len = count / nnops;
int remains = count - nnops * len;
int pos = 0;
for (i = 0; i < remains; i++)
{ {
memcpy (fragP->fr_literal + fragP->fr_fix, memset (fragP->fr_literal + fragP->fr_fix + pos, 0x66, len);
f16_patt[count - 1], count); fragP->fr_literal[fragP->fr_fix + pos + len] = 0x90;
if (count > 8) pos += len + 1;
/* Adjust jump offset. */ }
fragP->fr_literal[fragP->fr_fix + 1] = count - 2; for (; i < nnops; i++)
{
memset (fragP->fr_literal + fragP->fr_fix + pos, 0x66, len - 1);
fragP->fr_literal[fragP->fr_fix + pos + len - 1] = 0x90;
pos += len;
} }
else
memcpy (fragP->fr_literal + fragP->fr_fix,
f32_patt[count - 1], count);
fragP->fr_var = count;
} }
else
if (flag_code == CODE_16BIT)
{
memcpy (fragP->fr_literal + fragP->fr_fix,
f16_patt[count - 1], count);
if (count > 8)
/* Adjust jump offset. */
fragP->fr_literal[fragP->fr_fix + 1] = count - 2;
}
else
memcpy (fragP->fr_literal + fragP->fr_fix,
f32_patt[count - 1], count);
fragP->fr_var = count;
} }
static INLINE unsigned int static INLINE unsigned int