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Wed Feb 14 19:01:27 1996 Alan Modra <alan@spri.levels.unisa.edu.au>

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* i386-dis.c (onebyte_has_modrm): New static array.
	(twobyte_has_modrm): New static array.
	(print_insn_i386): Only fetch the mod/reg/rm byte if it is needed.
This commit is contained in:
Ian Lance Taylor
1996-02-15 00:08:45 +00:00
parent 95d31c3c8f
commit 03db5a9303
2 changed files with 71 additions and 19 deletions
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11
opcodes/ChangeLog
View File

@ -1,3 +1,14 @@
Wed Feb 14 19:01:27 1996 Alan Modra <alan@spri.levels.unisa.edu.au>
* i386-dis.c (onebyte_has_modrm): New static array.
(twobyte_has_modrm): New static array.
(print_insn_i386): Only fetch the mod/reg/rm byte if it is needed.
Tue Feb 13 15:15:01 1996 Ian Lance Taylor <ian@cygnus.com>
* Makefile.in ($(SHLINK)): Check ts against $(SHLIB), not
$(SHLINK).
Mon Feb 12 16:26:06 1996 Michael Meissner <meissner@tiktok.cygnus.com> Mon Feb 12 16:26:06 1996 Michael Meissner <meissner@tiktok.cygnus.com>
* ppc-opc.c (PPC): Undef, so default defination on Windows NT * ppc-opc.c (PPC): Undef, so default defination on Windows NT

51
opcodes/i386-dis.c
View File

@ -685,6 +685,44 @@ struct dis386 dis386_twobyte[] = {
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
}; };
static const unsigned char onebyte_has_modrm[256] = {
1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,
1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,
1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,
1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,1,1,0,0,0,0,0,1,0,1,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1,1,0,0,1,1,1,1,0,0,0,0,0,0,0,0,
1,1,1,1,0,0,0,0,1,1,1,1,1,1,1,1,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,1,1,0,0,0,0,0,0,1,1
};
static const unsigned char twobyte_has_modrm[256] = {
1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
0,0,0,1,1,1,1,1,0,0,0,1,1,1,1,1,
1,1,1,1,1,1,1,1,0,0,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
};
static char obuf[100]; static char obuf[100];
static char *obufp; static char *obufp;
static char scratchbuf[100]; static char scratchbuf[100];
@ -993,6 +1031,7 @@ print_insn_i386 (pc, info)
int enter_instruction; int enter_instruction;
char *first, *second, *third; char *first, *second, *third;
int needcomma; int needcomma;
unsigned char need_modrm;
struct dis_private priv; struct dis_private priv;
bfd_byte *inbuf = priv.the_buffer; bfd_byte *inbuf = priv.the_buffer;
@ -1058,20 +1097,22 @@ print_insn_i386 (pc, info)
{ {
FETCH_DATA (info, codep + 2); FETCH_DATA (info, codep + 2);
dp = &dis386_twobyte[*++codep]; dp = &dis386_twobyte[*++codep];
need_modrm = twobyte_has_modrm[*codep];
} }
else else
{
dp = &dis386[*codep]; dp = &dis386[*codep];
need_modrm = onebyte_has_modrm[*codep];
}
codep++; codep++;
/* Fetch the mod/reg/rm byte. FIXME: We should be only fetching if (need_modrm)
this if we need it. As it is, this code loses if there is a {
one-byte instruction (without a mod/reg/rm byte) at the end of
the address space. */
FETCH_DATA (info, codep + 1); FETCH_DATA (info, codep + 1);
mod = (*codep >> 6) & 3; mod = (*codep >> 6) & 3;
reg = (*codep >> 3) & 7; reg = (*codep >> 3) & 7;
rm = *codep & 7; rm = *codep & 7;
}
if (dp->name == NULL && dp->bytemode1 == FLOATCODE) if (dp->name == NULL && dp->bytemode1 == FLOATCODE)
{ {