Handle Alpha load-immediate-FP pseudo-instructions:

* config/alpha-opcode.h (ldif, ldig, ldis, ldit): New patterns.
* config/tc-alpha.c (lit8_sec, lit4_sec, lit8_sym, lit4_sym): New variables.
(create_literal_section): New function.
(create_lita_section): Now a macro.
(get_lit8_offset, get_lit4_offset): New functions.
(maybe_set_gp): New function.
(select_gp_value): Call it.
(load_expression): Preserve addend if symbol is a section symbol.
(alpha_ip): Handle new operand type `F' for floating-point constants; store
them in .lit{4,8} sections.
(alpha_ip, case 'G'): Emit LITUSE relocations for symbol exprs.
This commit is contained in:
Ken Raeburn 1994-03-09 02:44:00 +00:00
parent 055a75ef75
commit 40cd35fffd
2 changed files with 137 additions and 30 deletions

View File

@ -394,6 +394,10 @@ static const struct alpha_opcode alpha_opcodes[] =
{ "sts", 0x98000000, 1, "e,P" }, /* regbase macro */
{ "stt", 0x9c000000, 1, "e,l(2)" },
{ "stt", 0x9c000000, 1, "e,P" }, /* regbase macro */
{ "ldif", 0x80000000, 1, "e,F" },
{ "ldig", 0x84000000, 1, "e,F" },
{ "ldis", 0x88000000, 1, "e,F" },
{ "ldit", 0x8c000000, 1, "e,F" },
{ "fbeq", 0xc4000000, 1, "e,L" }, /* 6o+5a+21d */
{ "fbne", 0xd4000000, 1, "e,L" },

View File

@ -70,10 +70,11 @@ int md_long_jump_size = 4;
/* handle of the OPCODE hash table */
static struct hash_control *op_hash;
/* sections we'll want to keep track of */
static segT lita_sec, rdata, sdata;
/* Sections and symbols we'll want to keep track of. */
static segT lita_sec, rdata, sdata, lit8_sec, lit4_sec;
static symbolS *lit8_sym, *lit4_sym;
/* setting for ".set [no]{at,macro}" */
/* Setting for ".set [no]{at,macro}". */
static int at_ok = 1, macro_ok = 1;
/* Keep track of global pointer. */
@ -431,17 +432,54 @@ s_gprel32 ()
}
static void
create_lita_section ()
create_literal_section (secp, name)
segT *secp;
const char *name;
{
segT current_section = now_seg;
int current_subsec = now_subseg;
segT new_sec;
lita_sec = subseg_new (".lita", 0);
*secp = new_sec = subseg_new (name, 0);
subseg_set (current_section, current_subsec);
bfd_set_section_flags (stdoutput, lita_sec,
bfd_set_section_alignment (stdoutput, new_sec, 3);
bfd_set_section_flags (stdoutput, new_sec,
SEC_RELOC | SEC_ALLOC | SEC_LOAD | SEC_READONLY
| SEC_DATA);
bfd_set_section_alignment (stdoutput, lita_sec, 3);
}
#define create_lita_section() create_literal_section (&lita_sec, ".lita")
static valueT
get_lit8_offset (val)
bfd_vma val;
{
valueT retval;
if (lit8_sec == 0)
{
create_literal_section (&lit8_sec, ".lit8");
lit8_sym = section_symbol (lit8_sec);
}
retval = add_to_literal_pool ((symbolS *) 0, val, lit8_sec, 8);
if (retval >= 0xfff0)
as_fatal ("overflow in fp literal (.lit8) table");
return retval;
}
static valueT
get_lit4_offset (val)
bfd_vma val;
{
valueT retval;
if (lit4_sec == 0)
{
create_literal_section (&lit4_sec, ".lit4");
lit4_sym = section_symbol (lit4_sec);
}
retval = add_to_literal_pool ((symbolS *) 0, val, lit4_sec, 4);
if (retval >= 0xfff0)
as_fatal ("overflow in fp literal (.lit4) table");
return retval;
}
/* This function is called once, at assembler startup time. It should
@ -510,7 +548,6 @@ md_begin ()
}
if (lose)
as_fatal ("Broken assembler. No assembly attempted.");
@ -578,31 +615,34 @@ md_assemble (str)
}
}
static inline void
maybe_set_gp (sec)
asection *sec;
{
bfd_vma vma;
if (!sec)
return;
vma = bfd_get_section_vma (foo, sec);
if (vma && vma < alpha_gp_value)
alpha_gp_value = vma;
}
static void
select_gp_value ()
{
bfd_vma lita_vma, sdata_vma;
if (alpha_gp_value != 0)
abort ();
if (lita_sec)
lita_vma = bfd_get_section_vma (abfd, lita_sec);
else
lita_vma = 0;
#if 0
if (sdata)
sdata_vma = bfd_get_section_vma (abfd, sdata);
else
#endif
sdata = 0;
/* Get minus-one in whatever width... */
alpha_gp_value = 0; alpha_gp_value--;
if (lita_vma == 0
/* Who knows which order they'll get laid out in? */
|| (sdata_vma != 0 && sdata_vma < lita_vma))
alpha_gp_value = sdata_vma;
else
alpha_gp_value = lita_vma;
/* Select the smallest VMA of these existing sections. */
maybe_set_gp (lita_sec);
/* maybe_set_gp (sdata); Was disabled before -- should we use it? */
#if 0
maybe_set_gp (lit8_sec);
maybe_set_gp (lit4_sec);
#endif
alpha_gp_value += GP_ADJUSTMENT;
@ -747,8 +787,15 @@ load_expression (reg, insn)
valueT addend;
int num_insns = 1;
addend = insn->reloc[0].exp.X_add_number;
insn->reloc[0].exp.X_add_number = 0;
if (insn->reloc[0].exp.X_add_symbol->bsym->flags & BSF_SECTION_SYM)
{
addend = 0;
}
else
{
addend = insn->reloc[0].exp.X_add_number;
insn->reloc[0].exp.X_add_number = 0;
}
load_symbol_address (reg, insn);
if (addend)
{
@ -1165,6 +1212,60 @@ alpha_ip (str, insns)
}
continue;
case 'F':
{
int format, length, mode, i, size;
char temp[20 /*MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT*/];
char *err;
static const char formats[4] = "FGfd";
bfd_vma bits, offset;
char *old_input_line_pointer = input_line_pointer;
input_line_pointer = s;
SKIP_WHITESPACE ();
memset (temp, 0, sizeof (temp));
mode = (opcode >> 26) & 3;
format = formats[mode];
err = md_atof (format, temp, &length);
if (err)
{
as_bad ("Bad floating literal: %s", err);
bits = 0;
}
else
{
/* Generate little-endian number from byte sequence. */
bits = 0;
for (i = length - 1; i >= 0; i--)
bits += ((bfd_vma)(temp[i] & 0xff)) << (i * 8);
}
switch (length)
{
case 8:
offset = get_lit8_offset (bits) - 0x8000;
insns[0].reloc[0].exp.X_add_symbol = lit8_sym;
insns[0].reloc[0].exp.X_add_number = 0x8000;
break;
case 4:
offset = get_lit4_offset (bits) - 0x8000;
insns[0].reloc[0].exp.X_add_symbol = lit4_sym;
insns[0].reloc[0].exp.X_add_number = 0x8000;
break;
default:
abort ();
}
insns[0].reloc[0].exp.X_op = O_symbol;
offset &= 0xffff;
num_gen = load_expression (AT, &insns[0]);
insns[num_gen].reloc[0].code = BFD_RELOC_ALPHA_LITUSE;
insns[num_gen].reloc[0].exp = lituse_basereg;
insns[num_gen++].opcode = opcode | (AT << SB) | offset;
opcode = insns[0].opcode;
s = input_line_pointer;
input_line_pointer = old_input_line_pointer;
}
continue;
/* The following two.. take advantage of the fact that
opcode already contains most of what we need to know.
We just prepend to the instr an "ldah
@ -1246,8 +1347,10 @@ alpha_ip (str, insns)
{
struct alpha_it *i;
i = &insns[num_gen++];
i->reloc[0].code = BFD_RELOC_NONE;
i->opcode = old_opcode | (tmp_reg << SB);
i->reloc[0].code = BFD_RELOC_ALPHA_LITUSE;
i->reloc[0].exp = lituse_basereg;
}
}
else
@ -1271,7 +1374,7 @@ alpha_ip (str, insns)
continue;
/* Same failure modes as above, actually most of the
same code shared. */
same code shared. */
case 'B': /* Builtins */
args++;
switch (*args)