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* config/tc-rx.h (md_do_align): New.

Browse Source 
(MAX_MEM_FOR_RS_ALIGN_CODE): New.
* config/tc-rx.c (nops): New.
(rx_handle_align): Use various sized nops to align code.
This commit is contained in:
DJ Delorie
2010-07-02 20:40:28 +00:00
parent 44a808b1a4
commit 731df70d1a
3 changed files with 57 additions and 0 deletions
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5
gas/ChangeLog
View File

@ -1,5 +1,10 @@
2010-07-02 DJ Delorie <dj@redhat.com>
* config/tc-rx.h (md_do_align): New.
(MAX_MEM_FOR_RS_ALIGN_CODE): New.
* config/tc-rx.c (nops): New.
(rx_handle_align): Use various sized nops to align code.
* config/tc-rx.c (rx_bytesT): Add grown/shrank counters for
relaxation.
(rx_relax_frag): Prevent infinite loops of grow/shrink/grow/etc.

40
gas/config/tc-rx.c
View File

@ -1119,11 +1119,51 @@ md_section_align (segT segment, valueT size)
return ((size + (1 << align) - 1) & (-1 << align));
}
/* NOP - 1 cycle */
static unsigned char nop_1[] = { 0x03};
/* MOV.L R0,R0 - 1 cycle */
static unsigned char nop_2[] = { 0xef, 0x00};
/* MAX R0,R0 - 1 cycle */
static unsigned char nop_3[] = { 0xfc, 0x13, 0x00 };
/* MUL #1,R0 - 1 cycle */
static unsigned char nop_4[] = { 0x76, 0x10, 0x01, 0x00 };
/* MUL #1,R0 - 1 cycle */
static unsigned char nop_5[] = { 0x77, 0x10, 0x01, 0x00, 0x00 };
/* MUL #1,R0 - 1 cycle */
static unsigned char nop_6[] = { 0x74, 0x10, 0x01, 0x00, 0x00, 0x00 };
/* BRA.S .+7 - 1 cycle */
static unsigned char nop_7[] = { 0x0F, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03 };
static unsigned char *nops[] = { NULL, nop_1, nop_2, nop_3, nop_4, nop_5, nop_6, nop_7 };
#define BIGGEST_NOP 7
/* When relaxing, we need to output a reloc for any .align directive
so that we can retain this alignment as we adjust opcode sizes. */
void
rx_handle_align (fragS * frag)
{
if ((frag->fr_type == rs_align
|| frag->fr_type == rs_align_code)
&& subseg_text_p (now_seg))
{
int count = (frag->fr_next->fr_address
- frag->fr_address
- frag->fr_fix);
unsigned char *base = (unsigned char *)frag->fr_literal + frag->fr_fix;
if (count > BIGGEST_NOP)
{
base[0] = 0x2e;
base[1] = count;
frag->fr_var = 2;
}
else if (count > 0)
{
memcpy (base, nops[count], count);
frag->fr_var = count;
}
}
if (linkrelax
&& (frag->fr_type == rs_align
|| frag->fr_type == rs_align_code)

12
gas/config/tc-rx.h
View File

@ -75,6 +75,18 @@ extern void rx_cons_fix_new (fragS *, int, int, expressionS *);
#define tc_fix_adjustable(x) 0
#define md_do_align(n, fill, len, max, around) \
if ((n) \
&& !need_pass_2 \
&& (!(fill) \
|| ((char)*(fill) == (char)0x03 && (len) == 1)) \
&& subseg_text_p (now_seg)) \
{ \
frag_align_code ((n), (max)); \
goto around; \
}
#define MAX_MEM_FOR_RS_ALIGN_CODE 8
#define HANDLE_ALIGN(FRAG) rx_handle_align (FRAG)
extern void rx_handle_align (fragS *);