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old-cross-binutils/gas/config/tc-dvp.c
Doug Evans 3b4389e23e * config/tc-dvp.h (TC_START_LABEL): Define. 
* config/tc-dvp.c (force_mach_label): New function.
	(md_begin,create_colon_label,s_dmadata): Use it.
1998-03-17 22:10:10 +00:00

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/* tc-dvp.c -- Assembler for the DVP
Copyright (C) 1997, 1998 Free Software Foundation.
This file is part of GAS, the GNU Assembler.
GAS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GAS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GAS; see the file COPYING. If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <stdio.h>
#include <ctype.h>
#include "sysdep.h"
#include "as.h"
#include "subsegs.h"
/* Needed by opcode/dvp.h. */
#include "dis-asm.h"
#include "opcode/dvp.h"
#include "elf/mips.h"
#ifdef USE_STDARG
#include <stdarg.h>
#else
#include <varargs.h>
#endif
#define MIN(a,b) ((a) < (b) ? (a) : (b))
/* Compute DMA operand index number of OP. */
#define DMA_OPERAND_INDEX(op) ((op) - dma_operands)
/* Our local label prefix. */
#define LOCAL_LABEL_PREFIX ".L"
/* Label prefix for end markers used in autocounts. */
#define END_LABEL_PREFIX ".L.end."
/* Label to use for unique labels. */
#define UNIQUE_LABEL_PREFIX ".L.dvptmp."
static long parse_float PARAMS ((char **, const char **));
static symbolS * create_label PARAMS ((const char *, const char *));
static symbolS * create_colon_label PARAMS ((int, const char *, const char *));
static char * unique_name PARAMS ((const char *));
static int compute_nloop PARAMS ((gif_type, int, int));
static void check_nloop PARAMS ((gif_type, int, int, int,
char *, unsigned int));
static long eval_expr PARAMS ((int, int, const char *, ...));
static long parse_dma_addr_autocount ();
static void inline_dma_data PARAMS ((int, DVP_INSN *));
static void setup_dma_autocount PARAMS ((const char *, DVP_INSN *, int));
static void insert_operand
PARAMS ((dvp_cpu, const dvp_opcode *, const dvp_operand *, int,
DVP_INSN *, offsetT, const char **));
static void insert_operand_final
PARAMS ((dvp_cpu, const dvp_operand *, int,
DVP_INSN *, offsetT, char *, unsigned int));
static void insert_mpg_marker PARAMS ((void));
static int insert_file PARAMS ((const char *, void (*) (), int));
static int cur_vif_insn_length PARAMS ((void));
static void install_vif_length PARAMS ((char *, int));
const char comment_chars[] = ";";
const char line_comment_chars[] = "#";
const char line_separator_chars[] = "!";
const char EXP_CHARS[] = "eE";
const char FLT_CHARS[] = "dD";
/* Current assembler state.
Instructions like mpg and direct are followed by a restricted set of
instructions. In the case of a '*' length argument an end marker must
be provided. (e.g. mpg is followed by vu insns until a .EndMpg is
seen).
Allowed state transitions:
ASM_INIT -> ASM_MPG
ASM_DIRECT -> ASM_GIF
ASM_UNPACK
ASM_VU
*/
typedef enum {
ASM_INIT, ASM_DIRECT, ASM_MPG, ASM_UNPACK, ASM_VU, ASM_GIF
} asm_state;
/* We need to maintain a stack of the current and previous status to handle
such things as "direct ...; gifpacked ... ; .endgif ; .enddirect". */
#define MAX_STATE_DEPTH 2
static asm_state asm_state_stack[MAX_STATE_DEPTH];
/* Current state's index in the stack. */
static int cur_state_index;
/* Macro to fetch the current state. */
#define CUR_ASM_STATE (asm_state_stack[cur_state_index])
/* Functions to push/pop the state stack. */
static void push_asm_state PARAMS ((asm_state));
static void pop_asm_state PARAMS ((int));
static void set_asm_state PARAMS ((asm_state));
/* Current cpu (machine variant) type state.
We copy the mips16 way of recording what the current machine type is in
the code. A label is created whenever necessary and has an "other" value
the denotes the machine type. */
static dvp_cpu cur_cpu;
/* Record the current mach type. */
static void record_mach PARAMS ((dvp_cpu, int));
/* Force emission of mach type label at next insn.
This isn't static as TC_START_LABEL uses it. */
int force_mach_label PARAMS ((void));
/* Given a dvp_cpu value, return the STO_DVP value to use. */
static int cpu_sto PARAMS ((dvp_cpu, const char **));
/* Nonzero if inside .DmaData. */
static int dma_data_state = 0;
/* Label of .DmaData (internally generated for inline data). */
static const char *dma_data_name;
/* Type of gif tag. */
static gif_type gif_insn_type;
/* Name of label of current gif<foo> insn's data. */
static const char *gif_data_name;
/* Pointer to frag of current gif insn. */
static fragS *gif_insn_frag;
/* Pointer to current gif insn in gif_insn_frag. */
static char *gif_insn_frag_loc;
/* For variable length instructions, pointer to the initial frag
and pointer into that frag. These only hold valid values if
CUR_ASM_STATE is one of ASM_MPG, ASM_DIRECT, ASM_UNPACK. */
static fragS *cur_varlen_frag;
static char *cur_varlen_insn;
/* The length value specified in the insn, or -1 if '*'. */
static int cur_varlen_value;
/* Count of vu insns seen since the last mpg.
Set to -1 to disable automatic mpg insertion. */
static int vu_count;
/* Non-zero if packing vif instructions in dma tags. */
static int dma_pack_vif_p;
/* Non-zero if dma insns are to be included in the output.
This is the default, but writing "if (! no_dma)" is klunky. */
static int output_dma = 1;
/* Non-zero if vif insns are to be included in the output. */
static int output_vif = 1;
const char *md_shortopts = "";
struct option md_longopts[] =
{
#define OPTION_NO_DMA (OPTION_MD_BASE + 1)
{ "no-dma", no_argument, NULL, OPTION_NO_DMA },
#define OPTION_NO_DMA_VIF (OPTION_NO_DMA + 1)
{ "no-dma-vif", no_argument, NULL, OPTION_NO_DMA_VIF },
{NULL, no_argument, NULL, 0}
};
size_t md_longopts_size = sizeof(md_longopts);
int
md_parse_option (c, arg)
int c;
char *arg;
{
switch (c)
{
case OPTION_NO_DMA :
output_dma = 0;
break;
case OPTION_NO_DMA_VIF :
output_dma = 0;
output_vif = 0;
break;
default :
return 0;
}
return 1;
}
void
md_show_usage (stream)
FILE *stream;
{
fprintf (stream, "\
DVP options:\n\
-no-dma do not include DMA instructions in the output\n\
-no-dma-vif do not include DMA or VIF instructions in the output\n\
");
}
/* Set by md_assemble for use by dvp_fill_insn. */
static subsegT prev_subseg;
static segT prev_seg;
static void s_dmadata PARAMS ((int));
static void s_enddmadata PARAMS ((int));
static void s_dmapackvif PARAMS ((int));
static void s_enddirect PARAMS ((int));
static void s_endmpg PARAMS ((int));
static void s_endunpack PARAMS ((int));
static void s_endgif PARAMS ((int));
static void s_state PARAMS ((int));
/* The target specific pseudo-ops which we support. */
const pseudo_typeS md_pseudo_table[] =
{
{ "word", cons, 4 },
{ "quad", cons, 16 },
{ "dmadata", s_dmadata, 0 },
{ "dmapackvif", s_dmapackvif, 0 },
{ "enddirect", s_enddirect, 0 },
{ "enddmadata", s_enddmadata, 0 },
{ "endmpg", s_endmpg, 0 },
{ "endunpack", s_endunpack, 0 },
{ "endgif", s_endgif, 0 },
/* .vu added to simplify debugging and creation of input files */
{ "vu", s_state, ASM_VU },
{ NULL, NULL, 0 }
};
void
md_begin ()
{
/* Initialize the opcode tables.
This involves computing the hash chains. */
dvp_opcode_init_tables (0);
/* Force a mach type label for the first insn. */
force_mach_label ();
/* Initialize the parsing state. */
cur_state_index = 0;
set_asm_state (ASM_INIT);
/* Pack vif insns in dma tags by default. */
dma_pack_vif_p = 1;
/* Disable automatic mpg insertion. */
vu_count = -1;
}
/* We need to keep a list of fixups. We can't simply generate them as
we go, because that would require us to first create the frag, and
that would screw up references to ``.''. */
struct dvp_fixup
{
/* index into `dvp_operands' */
int opindex;
/* byte offset from beginning of instruction */
int offset;
expressionS exp;
};
#define MAX_FIXUPS 5
static int fixup_count;
static struct dvp_fixup fixups[MAX_FIXUPS];
/* Given a cpu type and operand number, return a temporary reloc type
for use in generating the fixup that encodes the cpu type and operand. */
static int encode_fixup_reloc_type PARAMS ((dvp_cpu, int));
/* Given an encoded fixup reloc type, decode it into cpu and operand. */
static void decode_fixup_reloc_type PARAMS ((int, dvp_cpu *,
const dvp_operand **));
static void assemble_dma PARAMS ((char *));
static void assemble_gif PARAMS ((char *));
static void assemble_vif PARAMS ((char *));
static void assemble_vu PARAMS ((char *));
static const dvp_opcode * assemble_vu_insn PARAMS ((dvp_cpu,
const dvp_opcode *,
const dvp_operand *,
char **, char *));
static const dvp_opcode * assemble_one_insn PARAMS ((dvp_cpu,
const dvp_opcode *,
const dvp_operand *,
char **, DVP_INSN *));
/* Main entry point for assembling an instruction. */
void
md_assemble (str)
char *str;
{
/* Skip leading white space. */
while (isspace (*str))
str++;
/* After a gif tag, no insns can appear until a .endgif is seen. */
if (CUR_ASM_STATE == ASM_GIF)
{
as_bad ("missing .endgif");
pop_asm_state (1);
}
/* Ditto for unpack. */
if (CUR_ASM_STATE == ASM_UNPACK)
{
as_bad ("missing .endunpack");
pop_asm_state (1);
}
#if 0 /* this doesn't work of course as gif insns may follow */
/* Ditto for direct. */
if (CUR_ASM_STATE == ASM_DIRECT)
{
as_bad ("missing .enddirect");
pop_asm_state (1);
}
#endif
if (CUR_ASM_STATE == ASM_INIT)
{
if (strncasecmp (str, "dma", 3) == 0)
assemble_dma (str);
else if (strncasecmp (str, "gif", 3) == 0)
assemble_gif (str);
else
assemble_vif (str);
}
else if (CUR_ASM_STATE == ASM_DIRECT)
assemble_gif (str);
else if (CUR_ASM_STATE == ASM_VU
|| CUR_ASM_STATE == ASM_MPG)
assemble_vu (str);
else
as_fatal ("unknown parse state");
}
/* Subroutine of md_assemble to assemble DMA instructions. */
static void
assemble_dma (str)
char *str;
{
DVP_INSN insn_buf[2];
/* Insn's length, in 32 bit words. */
int len;
/* Pointer to allocated frag. */
char *f;
int i;
const dvp_opcode *opcode;
if (output_dma)
{
/* Do an implicit alignment to a 16 byte boundary.
Do it now so that inline dma data labels are at the right place. */
frag_align (4, 0, 0);
record_alignment (now_seg, 4);
}
/* This is the DMA tag. */
insn_buf[0] = 0;
insn_buf[1] = 0;
opcode = assemble_one_insn (DVP_DMA,
dma_opcode_lookup_asm (str), dma_operands,
&str, insn_buf);
if (opcode == NULL)
return;
if (!output_dma)
return;
record_mach (DVP_DMA, 0);
f = frag_more (8);
/* Write out the DMA instruction. */
for (i = 0; i < 2; ++i)
md_number_to_chars (f + i * 4, insn_buf[i], 4);
/* Create any fixups. */
/* FIXME: It might eventually be possible to combine all the various
copies of this bit of code. */
for (i = 0; i < fixup_count; ++i)
{
int op_type, reloc_type, offset;
const dvp_operand *operand;
/* Create a fixup for this operand.
At this point we do not use a bfd_reloc_code_real_type for
operands residing in the insn, but instead just use the
operand index. This lets us easily handle fixups for any
operand type, although that is admittedly not a very exciting
feature. We pick a BFD reloc type in md_apply_fix. */
op_type = fixups[i].opindex;
offset = fixups[i].offset;
reloc_type = encode_fixup_reloc_type (DVP_DMA, op_type);
operand = &dma_operands[op_type];
fix_new_exp (frag_now, f + offset - frag_now->fr_literal, 4,
&fixups[i].exp,
(operand->flags & DVP_OPERAND_RELATIVE_BRANCH) != 0,
(bfd_reloc_code_real_type) reloc_type);
}
/* The upper two words are vif insns. */
record_mach (DVP_VIF, 0);
/* If not doing dma/vif packing, fill out the insn with vif nops.
??? We take advantage of the fact that the default fill value of zero
is the vifnop insn. This occurs for example when handling mpg
alignment. It also occurs when one dma tag immediately follows the
previous one. */
if (! dma_pack_vif_p)
{
f = frag_more (8);
#define VIFNOP 0
md_number_to_chars (f + 0, VIFNOP, 4);
md_number_to_chars (f + 4, VIFNOP, 4);
}
}
/* Subroutine of md_assemble to assemble VIF instructions. */
static void
assemble_vif (str)
char *str;
{
/* Space for the instruction.
The variable length insns can require much more space than this.
It is allocated later, when we know we have such an insn. */
DVP_INSN insn_buf[5];
/* Insn's length, in 32 bit words. */
int len;
/* Pointer to allocated frag. */
char *f;
int i;
const dvp_opcode *opcode;
opcode = assemble_one_insn (DVP_VIF,
vif_opcode_lookup_asm (str), vif_operands,
&str, insn_buf);
if (opcode == NULL)
return;
if (opcode->flags & VIF_OPCODE_LENVAR)
len = 1; /* actual data follows later */
else if (opcode->flags & VIF_OPCODE_LEN2)
len = 2;
else if (opcode->flags & VIF_OPCODE_LEN5)
len = 5;
else
len = 1;
/* We still have to switch modes (if mpg for example) so we can't exit
early if -no-vif. */
if (output_vif)
{
/* Record the mach before doing the alignment so that we properly
disassemble any inserted vifnop's. For variable length insns
force the recording of the mach type for the next insn. A label may
be embedded in it to compute the length and this will cause the
disassembler to wrongly disassemble the next insn. */
if (opcode->flags & VIF_OPCODE_LENVAR)
record_mach (DVP_VIF, 1);
else
record_mach (DVP_VIF, 0);
if (opcode->flags & VIF_OPCODE_MPG)
{
frag_align (3, 0, 0);
record_alignment (now_seg, 3);
/* FIXME: The data must be aligned on a 64 bit boundary.
Not sure how to do this yet, other than by performing relaxing,
so punt by making the mpg insn 8 bytes (vifnop,mpg). */
f = frag_more (4);
memset (f, 0, 4);
}
else if (opcode->flags & VIF_OPCODE_DIRECT)
{
frag_align (4, 0, 0);
record_alignment (now_seg, 4);
/* FIXME: revisit */
f = frag_more (12);
memset (f, 0, 12);
}
/* Reminder: it is important to fetch enough space in one call to
`frag_more'. We use (f - frag_now->fr_literal) to compute where
we are and we don't want frag_now to change between calls. */
f = frag_more (len * 4);
/* Write out the instruction. */
for (i = 0; i < len; ++i)
md_number_to_chars (f + i * 4, insn_buf[i], 4);
/* Create any fixups. */
/* FIXME: It might eventually be possible to combine all the various
copies of this bit of code. */
for (i = 0; i < fixup_count; ++i)
{
int op_type, reloc_type, offset;
const dvp_operand *operand;
/* Create a fixup for this operand.
At this point we do not use a bfd_reloc_code_real_type for
operands residing in the insn, but instead just use the
operand index. This lets us easily handle fixups for any
operand type, although that is admittedly not a very exciting
feature. We pick a BFD reloc type in md_apply_fix. */
op_type = fixups[i].opindex;
offset = fixups[i].offset;
reloc_type = encode_fixup_reloc_type (DVP_VIF, op_type);
operand = &vif_operands[op_type];
fix_new_exp (frag_now, f + offset - frag_now->fr_literal, 4,
&fixups[i].exp,
(operand->flags & DVP_OPERAND_RELATIVE_BRANCH) != 0,
(bfd_reloc_code_real_type) reloc_type);
}
}
/* Handle variable length insns. */
if (opcode->flags & VIF_OPCODE_LENVAR)
{
/* Name of file to read data from. */
char *file;
/* Length in 32 bit words. */
int data_len;
file = NULL;
data_len = 0;
vif_get_var_data (&file, &data_len);
cur_varlen_frag = frag_now;
cur_varlen_insn = f;
cur_varlen_value = data_len;
if (file)
{
int byte_len;
/* Indicate length must be computed. */
cur_varlen_value = -1;
/* The handling for each of mpg,direct,unpack is basically the same:
- emit a label to set the mach type for the data we're inserting
- switch to the new assembler state
- insert the file
- call the `end' handler */
if (opcode->flags & VIF_OPCODE_MPG)
{
record_mach (DVP_VUUP, 1);
set_asm_state (ASM_MPG);
byte_len = insert_file (file, insert_mpg_marker, 256 * 8);
s_endmpg (1);
}
else if (opcode->flags & VIF_OPCODE_DIRECT)
{
record_mach (DVP_GIF, 1);
set_asm_state (ASM_DIRECT);
byte_len = insert_file (file, NULL, 0);
s_enddirect (1);
}
else if (opcode->flags & VIF_OPCODE_UNPACK)
{
set_asm_state (ASM_UNPACK);
byte_len = insert_file (file, NULL, 0);
s_endunpack (1);
}
else
as_fatal ("unknown cpu type for variable length vif insn");
}
else
{
/* data_len == -1 means the value must be computed from
the data. */
if (data_len == 0 || data_len < -2)
as_bad ("invalid data length");
if (opcode->flags & VIF_OPCODE_MPG)
{
set_asm_state (ASM_MPG);
/* Enable automatic mpg insertion every 256 insns. */
vu_count = 0;
}
else if (opcode->flags & VIF_OPCODE_DIRECT)
set_asm_state (ASM_DIRECT);
else if (opcode->flags & VIF_OPCODE_UNPACK)
set_asm_state (ASM_UNPACK);
}
}
}
/* Subroutine of md_assemble to assemble GIF instructions. */
static void
assemble_gif (str)
char *str;
{
DVP_INSN insn_buf[4];
const dvp_opcode *opcode;
char *f;
int i;
insn_buf[0] = insn_buf[1] = insn_buf[2] = insn_buf[3] = 0;
opcode = assemble_one_insn (DVP_GIF,
gif_opcode_lookup_asm (str), gif_operands,
&str, insn_buf);
if (opcode == NULL)
return;
/* Do an implicit alignment to a 16 byte boundary. */
frag_align (4, 0, 0);
record_alignment (now_seg, 4);
/* Insert a label so we can compute the number of quadwords when the
.endgif is seen. This is put before the mach type label because gif
insns are followed by data and we don't want the disassembler to try
to disassemble them as mips insns (since it uses the st_other field)
of the closest label to choose the mach type and since we don't have
a special st_other value for "data". */
gif_data_name = S_GET_NAME (create_colon_label (0, "", unique_name (NULL)));
record_mach (DVP_GIF, 1);
gif_insn_frag_loc = f = frag_more (16);
gif_insn_frag = frag_now;
for (i = 0; i < 4; ++i)
md_number_to_chars (f + i * 4, insn_buf[i], 4);
/* Record the type of the gif tag so we know how to compute nloop
in s_endgif. */
if (strcmp (opcode->mnemonic, "gifpacked") == 0)
gif_insn_type = GIF_PACKED;
else if (strcmp (opcode->mnemonic, "gifreglist") == 0)
gif_insn_type = GIF_REGLIST;
else if (strcmp (opcode->mnemonic, "gifimage") == 0)
gif_insn_type = GIF_IMAGE;
else
abort ();
push_asm_state (ASM_GIF);
}
/* Subroutine of md_assemble to assemble VU instructions. */
static void
assemble_vu (str)
char *str;
{
char *f;
const dvp_opcode *opcode;
/* Handle automatic mpg insertion if enabled. */
if (CUR_ASM_STATE == ASM_MPG
&& vu_count == 256)
insert_mpg_marker ();
/* Do an implicit alignment to a 8 byte boundary. */
frag_align (3, 0, 0);
record_alignment (now_seg, 3);
record_mach (DVP_VUUP, 0);
/* The lower instruction has the lower address.
Handle this by grabbing 8 bytes now, and then filling each word
as appropriate. */
f = frag_more (8);
#ifdef VERTICAL_BAR_SEPARATOR
char *p = strchr (str, '|');
if (p == NULL)
{
as_bad ("lower slot missing in `%s'", str);
return;
}
*p = 0;
opcode = assemble_vu_insn (DVP_VUUP,
vu_upper_opcode_lookup_asm (str), vu_operands,
&str, f + 4);
*p = '|';
str = p + 1;
#else
opcode = assemble_vu_insn (DVP_VUUP,
vu_upper_opcode_lookup_asm (str), vu_operands,
&str, f + 4);
#endif
/* Don't assemble next one if we couldn't assemble the first. */
if (opcode == NULL)
return;
opcode = assemble_vu_insn (DVP_VULO,
vu_lower_opcode_lookup_asm (str), vu_operands,
&str, f);
/* If this was the "loi" pseudo-insn, we need to set the `i' bit. */
if (opcode != NULL)
{
if (strcmp (opcode->mnemonic, "loi") == 0)
f[7] |= 0x80;
}
/* Increment the vu insn counter.
If get reach 256 we need to insert an `mpg'. */
++vu_count;
}
static const dvp_opcode *
assemble_vu_insn (cpu, opcode, operand_table, pstr, buf)
dvp_cpu cpu;
const dvp_opcode *opcode;
const dvp_operand *operand_table;
char **pstr;
char *buf;
{
int i;
DVP_INSN insn;
opcode = assemble_one_insn (cpu, opcode, operand_table, pstr, &insn);
if (opcode == NULL)
return NULL;
/* Write out the instruction.
Reminder: it is important to fetch enough space in one call to
`frag_more'. We use (f - frag_now->fr_literal) to compute where
we are and we don't want frag_now to change between calls. */
md_number_to_chars (buf, insn, 4);
/* Create any fixups. */
for (i = 0; i < fixup_count; ++i)
{
int op_type, reloc_type;
const dvp_operand *operand;
/* Create a fixup for this operand.
At this point we do not use a bfd_reloc_code_real_type for
operands residing in the insn, but instead just use the
operand index. This lets us easily handle fixups for any
operand type, although that is admittedly not a very exciting
feature. We pick a BFD reloc type in md_apply_fix. */
op_type = fixups[i].opindex;
reloc_type = encode_fixup_reloc_type (cpu, op_type);
operand = &vu_operands[op_type];
fix_new_exp (frag_now, buf - frag_now->fr_literal, 4,
&fixups[i].exp,
(operand->flags & DVP_OPERAND_RELATIVE_BRANCH) != 0,
(bfd_reloc_code_real_type) reloc_type);
}
/* All done. */
return opcode;
}
/* Assemble one instruction at *PSTR.
CPU indicates what component we're assembling for.
The assembled instruction is stored in INSN_BUF.
OPCODE is a pointer to the head of the hash chain.
*PSTR is updated to point passed the parsed instruction.
If the insn is successfully parsed the result is a pointer to the opcode
entry that successfully matched and *PSTR is updated to point passed
the parsed insn. If an error occurs the result is NULL and *PSTR is left
at some random point in the string (??? may wish to leave it pointing where
the error occured). */
static const dvp_opcode *
assemble_one_insn (cpu, opcode, operand_table, pstr, insn_buf)
dvp_cpu cpu;
const dvp_opcode *opcode;
const dvp_operand *operand_table;
char **pstr;
DVP_INSN *insn_buf;
{
char *start, *str;
/* Keep looking until we find a match. */
start = str = *pstr;
for ( ; opcode != NULL; opcode = DVP_OPCODE_NEXT_ASM (opcode))
{
int past_opcode_p, num_suffixes;
const unsigned char *syn;
/* Ensure the mnemonic part matches. */
for (str = start, syn = opcode->mnemonic; *syn != '\0'; ++str, ++syn)
if (tolower (*str) != tolower (*syn))
break;
if (*syn != '\0')
continue;
/* Scan the syntax string. If it doesn't match, try the next one. */
dvp_opcode_init_parse ();
insn_buf[opcode->opcode_word] = opcode->value;
fixup_count = 0;
past_opcode_p = 0;
num_suffixes = 0;
/* We don't check for (*str != '\0') here because we want to parse
any trailing fake arguments in the syntax string. */
for (/*str = start, */ syn = opcode->syntax; *syn != '\0'; )
{
int mods,index;
const dvp_operand *operand;
const char *errmsg;
/* Non operand chars must match exactly.
Operand chars that are letters are not part of symbols
and are case insensitive. */
if (*syn < 128)
{
if (tolower (*str) == tolower (*syn))
{
if (*syn == ' ')
past_opcode_p = 1;
++syn;
++str;
}
else
break;
continue;
}
/* We have a suffix or an operand. Pick out any modifiers. */
mods = 0;
index = DVP_OPERAND_INDEX (*syn);
while (DVP_MOD_P (operand_table[index].flags))
{
mods |= operand_table[index].flags & DVP_MOD_BITS;
++syn;
index = DVP_OPERAND_INDEX (*syn);
}
operand = operand_table + index;
if (operand->flags & DVP_OPERAND_FAKE)
{
long value = 0;
if (operand->flags & DVP_OPERAND_DMA_INLINE)
{
inline_dma_data ((mods & DVP_OPERAND_AUTOCOUNT) != 0,
insn_buf);
++syn;
continue;
}
if (operand->parse)
{
errmsg = NULL;
value = (*operand->parse) (opcode, operand, mods,
&str, &errmsg);
if (errmsg)
break;
}
if (operand->insert)
{
errmsg = NULL;
(*operand->insert) (opcode, operand, mods, insn_buf,
(offsetT) value, &errmsg);
/* If we get an error, go on to try the next insn. */
if (errmsg)
break;
}
++syn;
}
/* Are we finished with suffixes? */
else if (!past_opcode_p)
{
long suf_value;
if (!(operand->flags & DVP_OPERAND_SUFFIX))
as_fatal ("bad opcode table, missing suffix flag");
/* If we're at a space in the input string, we want to skip the
remaining suffixes. There may be some fake ones though, so
just go on to try the next one. */
if (*str == ' ')
{
++syn;
continue;
}
/* Parse the suffix. */
errmsg = NULL;
suf_value = (*operand->parse) (opcode, operand, mods, &str,
&errmsg);
if (errmsg)
{
/* This can happen, for example, in ARC's in "blle foo" and
we're currently using the template "b%q%.n %j". The "bl"
insn occurs later in the table so "lle" isn't an illegal
suffix. */
break;
}
/* Insert the suffix's value into the insn. */
insert_operand (cpu, opcode, operand, mods, insn_buf,
(offsetT) suf_value, &errmsg);
++syn;
}
else
/* This is an operand, either a register or an expression of
some kind. */
{
char c;
char *hold;
long value = 0;
expressionS exp;
if (operand->flags & DVP_OPERAND_SUFFIX)
as_fatal ("bad opcode table, suffix wrong");
/* Is there anything left to parse?
We don't check for this at the top because we want to parse
any trailing fake arguments in the syntax string. */
/* ??? This doesn't allow operands with a legal value of "". */
if (*str == '\0')
break;
/* Parse the operand. */
if (operand->flags & DVP_OPERAND_FLOAT)
{
errmsg = 0;
value = parse_float (&str, &errmsg);
if (errmsg)
break;
}
else if ((operand->flags & DVP_OPERAND_DMA_ADDR)
&& (mods & DVP_OPERAND_AUTOCOUNT))
{
errmsg = 0;
value = parse_dma_addr_autocount (opcode, operand, mods,
insn_buf, &str, &errmsg);
if (errmsg)
break;
}
else if (operand->parse)
{
errmsg = NULL;
value = (*operand->parse) (opcode, operand, mods,
&str, &errmsg);
if (errmsg)
break;
}
else
{
hold = input_line_pointer;
input_line_pointer = str;
expression (&exp);
str = input_line_pointer;
input_line_pointer = hold;
if (exp.X_op == O_illegal
|| exp.X_op == O_absent)
break;
else if (exp.X_op == O_constant)
value = exp.X_add_number;
else if (exp.X_op == O_register)
as_fatal ("got O_register");
else
{
/* We need to generate a fixup for this expression. */
if (fixup_count >= MAX_FIXUPS)
as_fatal ("too many fixups");
fixups[fixup_count].exp = exp;
fixups[fixup_count].opindex = index;
/* FIXME: Revisit. Do we really need operand->word?
The endianness of a 128 bit DMAtag is rather
twisted. How about defining word 0 as the word with
the lowest address and basing operand-shift off that.
operand->word could then be deleted. */
if (operand->word != 0)
fixups[fixup_count].offset = operand->word * 4;
else
fixups[fixup_count].offset = (operand->shift / 32) * 4;
++fixup_count;
value = 0;
}
}
/* Insert the register or expression into the instruction. */
errmsg = NULL;
insert_operand (cpu, opcode, operand, mods, insn_buf,
(offsetT) value, &errmsg);
if (errmsg != (const char *) NULL)
break;
++syn;
}
}
/* If we're at the end of the syntax string, we're done. */
if (*syn == '\0')
{
int i;
/* For the moment we assume a valid `str' can only contain blanks
now. IE: We needn't try again with a longer version of the
insn and it is assumed that longer versions of insns appear
before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3). */
while (isspace (*str))
++str;
if (*str != '\0'
#ifndef VERTICAL_BAR_SEPARATOR
&& cpu != DVP_VUUP
#endif
)
as_bad ("junk at end of line: `%s'", str);
/* It's now up to the caller to emit the instruction and any
relocations. */
*pstr = str;
return opcode;
}
/* Try the next entry. */
}
as_bad ("bad instruction `%s'", start);
return 0;
}
/* Given a dvp cpu type, return it's STO_DVP value.
The label prefix to use is stored in *PNAME. */
static int
cpu_sto (cpu, pname)
dvp_cpu cpu;
const char **pname;
{
switch (cpu)
{
case DVP_DMA : *pname = ".dma."; return STO_DVP_DMA;
case DVP_VIF : *pname = ".vif."; return STO_DVP_VIF;
case DVP_GIF : *pname = ".gif."; return STO_DVP_GIF;
case DVP_VUUP : *pname = ".vu."; return STO_DVP_VU;
}
abort ();
}
/* Record the current mach type in the object file.
If FORCE_NEXT_P is non-zero, force a label to be emitted the next time
we're called. This is useful for variable length instructions that can
have labels embedded within them. */
static void
record_mach (cpu, force_next_p)
dvp_cpu cpu;
int force_next_p;
{
symbolS *label;
const char *name;
int sto;
if (cpu == cur_cpu)
return;
sto = cpu_sto (cpu, &name);
label = create_colon_label (sto, "", unique_name (name));
if (force_next_p)
cur_cpu = DVP_UNKNOWN;
else
cur_cpu = cpu;
}
/* Force emission of mach type label at next insn.
This isn't static as TC_START_LABEL uses it.
The result is the value of TC_START_LABEL. */
int
force_mach_label ()
{
cur_cpu = DVP_UNKNOWN;
return 1;
}
/* Push/pop the current parsing state. */
static void
push_asm_state (new_state)
asm_state new_state;
{
++cur_state_index;
if (cur_state_index == MAX_STATE_DEPTH)
as_fatal ("unexpected state push");
asm_state_stack[cur_state_index] = new_state;
}
/* TOP_OK_P is non-zero if it's ok that we're at the top of the stack.
This happens if there are errors in the assembler code.
We just reset the stack to its "init" state. */
static void
pop_asm_state (top_ok_p)
int top_ok_p;
{
if (cur_state_index == 0)
{
if (top_ok_p)
asm_state_stack[cur_state_index] = ASM_INIT;
else
as_fatal ("unexpected state pop");
}
else
--cur_state_index;
}
static void
set_asm_state (state)
asm_state state;
{
CUR_ASM_STATE = state;
}
void
md_operand (expressionP)
expressionS *expressionP;
{
}
valueT
md_section_align (segment, size)
segT segment;
valueT size;
{
int align = bfd_get_section_alignment (stdoutput, segment);
return ((size + (1 << align) - 1) & (-1 << align));
}
symbolS *
md_undefined_symbol (name)
char *name;
{
return 0;
}
/* Called after parsing the file via md_after_pass_hook. */
void
dvp_after_pass_hook ()
{
/* If doing dma packing, ensure the last dma tag is filled out. */
if (dma_pack_vif_p)
{
/* Nothing to do as vifnops are zero and frag_align at beginning
of dmatag is all we need. */
}
#if 0 /* ??? Doesn't work unless we keep track of the nested include file
level. */
/* Check for missing .EndMpg, and supply one if necessary. */
if (CUR_ASM_STATE == ASM_MPG)
s_endmpg (1);
else if (CUR_ASM_STATE == ASM_DIRECT)
s_enddirect (0);
else if (CUR_ASM_STATE == ASM_UNPACK)
s_endunpack (0);
#endif
}
/* Called when a label is defined via tc_frob_label. */
void
dvp_frob_label (sym)
symbolS *sym;
{
/* All labels in vu code must be specially marked for the disassembler.
The disassembler ignores all previous information at each new label
(that has a higher address than the last one). */
if (CUR_ASM_STATE == ASM_MPG
|| CUR_ASM_STATE == ASM_VU)
S_SET_OTHER (sym, STO_DVP_VU);
}
/* Functions concerning relocs. */
/* Spacing between each cpu type's operand numbers.
Should be at least as big as any operand table. */
#define RELOC_SPACING 256
/* Given a cpu type and operand number, return a temporary reloc type
for use in generating the fixup that encodes the cpu type and operand
number. */
static int
encode_fixup_reloc_type (cpu, opnum)
dvp_cpu cpu;
int opnum;
{
return (int) BFD_RELOC_UNUSED + ((int) cpu * RELOC_SPACING) + opnum;
}
/* Given a fixup reloc type, decode it into cpu type and operand. */
static void
decode_fixup_reloc_type (fixup_reloc, cpuP, operandP)
int fixup_reloc;
dvp_cpu *cpuP;
const dvp_operand **operandP;
{
dvp_cpu cpu = (fixup_reloc - (int) BFD_RELOC_UNUSED) / RELOC_SPACING;
int opnum = (fixup_reloc - (int) BFD_RELOC_UNUSED) % RELOC_SPACING;
*cpuP = cpu;
switch (cpu)
{
case DVP_VUUP : *operandP = &vu_operands[opnum]; break;
case DVP_VULO : *operandP = &vu_operands[opnum]; break;
case DVP_DMA : *operandP = &dma_operands[opnum]; break;
case DVP_VIF : *operandP = &vif_operands[opnum]; break;
case DVP_GIF : *operandP = &gif_operands[opnum]; break;
default : as_fatal ("bad fixup encoding");
}
}
/* Given a fixup reloc type, return a pointer to the operand
/* The location from which a PC relative jump should be calculated,
given a PC relative reloc. */
long
md_pcrel_from_section (fixP, sec)
fixS *fixP;
segT sec;
{
if (fixP->fx_addsy != (symbolS *) NULL
&& (! S_IS_DEFINED (fixP->fx_addsy)
|| S_GET_SEGMENT (fixP->fx_addsy) != sec))
{
/* The symbol is undefined (or is defined but not in this section).
Let the linker figure it out. +8: branch offsets are relative to the
delay slot. */
return 8;
}
/* We assume this is a vu branch.
Offsets are calculated based on the address of the next insn. */
return ((fixP->fx_frag->fr_address + fixP->fx_where) & -8L) + 8;
}
/* Apply a fixup to the object code. This is called for all the
fixups we generated by calls to fix_new_exp. At this point all symbol
values should be fully resolved, and we attempt to completely resolve the
reloc. If we can not do that, we determine the correct reloc code and put
it back in the fixup. */
int
md_apply_fix3 (fixP, valueP, seg)
fixS *fixP;
valueT *valueP;
segT seg;
{
char *where = fixP->fx_frag->fr_literal + fixP->fx_where;
valueT value;
/* FIXME FIXME FIXME: The value we are passed in *valueP includes
the symbol values. Since we are using BFD_ASSEMBLER, if we are
doing this relocation the code in write.c is going to call
bfd_perform_relocation, which is also going to use the symbol
value. That means that if the reloc is fully resolved we want to
use *valueP since bfd_perform_relocation is not being used.
However, if the reloc is not fully resolved we do not want to use
*valueP, and must use fx_offset instead. However, if the reloc
is PC relative, we do want to use *valueP since it includes the
result of md_pcrel_from. This is confusing. */
if (fixP->fx_addsy == (symbolS *) NULL)
{
value = *valueP;
fixP->fx_done = 1;
}
else if (fixP->fx_pcrel)
{
value = *valueP;
}
else
{
value = fixP->fx_offset;
if (fixP->fx_subsy != (symbolS *) NULL)
{
if (S_GET_SEGMENT (fixP->fx_subsy) == absolute_section)
value -= S_GET_VALUE (fixP->fx_subsy);
else
{
/* We can't actually support subtracting a symbol. */
as_bad_where (fixP->fx_file, fixP->fx_line,
"expression too complex");
}
}
}
/* Check for dvp operands. These are indicated with a reloc value
>= BFD_RELOC_UNUSED. */
if ((int) fixP->fx_r_type >= (int) BFD_RELOC_UNUSED)
{
dvp_cpu cpu;
const dvp_operand *operand;
DVP_INSN insn;
decode_fixup_reloc_type ((int) fixP->fx_r_type,
& cpu, & operand);
/* For the gif nloop operand, if it was specified by the user ensure
it matches the value we computed. */
if (cpu == DVP_GIF
&& (operand - gif_operands) == gif_operand_nloop)
{
value = compute_nloop (fixP->tc_fix_data.type,
fixP->tc_fix_data.nregs,
value);
if (fixP->tc_fix_data.user_nloop != -1)
{
check_nloop (fixP->tc_fix_data.type,
fixP->tc_fix_data.nregs,
fixP->tc_fix_data.user_nloop,
value,
fixP->fx_file, fixP->fx_line);
/* Don't override the user specified value. */
fixP->fx_done = 1;
return 1;
}
}
/* Fetch the instruction, insert the fully resolved operand
value, and stuff the instruction back again. The fixup is recorded
at the appropriate word so pass DVP_MOD_THIS_WORD so any offset
specified in the tables is ignored. */
insn = bfd_getl32 ((unsigned char *) where);
insert_operand_final (cpu, operand, DVP_MOD_THIS_WORD, &insn,
(offsetT) value, fixP->fx_file, fixP->fx_line);
bfd_putl32 ((bfd_vma) insn, (unsigned char *) where);
if (fixP->fx_done)
{
/* Nothing else to do here. */
return 1;
}
/* Determine a BFD reloc value based on the operand information.
We are only prepared to turn a few of the operands into relocs. */
/* FIXME: This test is a hack. */
if ((operand->flags & DVP_OPERAND_RELATIVE_BRANCH) != 0)
{
assert (operand->bits == 11
&& operand->shift == 0);
fixP->fx_r_type = BFD_RELOC_MIPS_DVP_11_PCREL;
}
else if ((operand->flags & DVP_OPERAND_DMA_ADDR) != 0
|| (operand->flags & DVP_OPERAND_DMA_NEXT) != 0)
{
assert (operand->bits == 27
&& operand->shift == 4);
fixP->fx_r_type = BFD_RELOC_MIPS_DVP_27_S4;
}
else
{
as_bad_where (fixP->fx_file, fixP->fx_line,
"unresolved expression that must be resolved");
fixP->fx_done = 1;
return 1;
}
}
else
{
switch (fixP->fx_r_type)
{
case BFD_RELOC_8:
md_number_to_chars (where, value, 1);
break;
case BFD_RELOC_16:
md_number_to_chars (where, value, 2);
break;
case BFD_RELOC_32:
md_number_to_chars (where, value, 4);
break;
default:
as_fatal ("unexpected fixup");
}
}
fixP->fx_addnumber = value;
return 1;
}
/* Translate internal representation of relocation info to BFD target
format. */
arelent *
tc_gen_reloc (section, fixP)
asection *section;
fixS *fixP;
{
arelent *reloc;
reloc = (arelent *) xmalloc (sizeof (arelent));
reloc->sym_ptr_ptr = &fixP->fx_addsy->bsym;
reloc->address = fixP->fx_frag->fr_address + fixP->fx_where;
reloc->howto = bfd_reloc_type_lookup (stdoutput, fixP->fx_r_type);
if (reloc->howto == (reloc_howto_type *) NULL)
{
as_bad_where (fixP->fx_file, fixP->fx_line,
"internal error: can't export reloc type %d (`%s')",
fixP->fx_r_type, bfd_get_reloc_code_name (fixP->fx_r_type));
return NULL;
}
assert (!fixP->fx_pcrel == !reloc->howto->pc_relative);
reloc->addend = fixP->fx_addnumber;
return reloc;
}
/* Write a value out to the object file, using the appropriate endianness. */
void
md_number_to_chars (buf, val, n)
char *buf;
valueT val;
int n;
{
if (target_big_endian)
number_to_chars_bigendian (buf, val, n);
else
number_to_chars_littleendian (buf, val, n);
}
/* Turn a string in input_line_pointer into a floating point constant of type
type, and store the appropriate bytes in *litP. The number of LITTLENUMS
emitted is stored in *sizeP . An error message is returned, or NULL on OK.
*/
/* Equal to MAX_PRECISION in atof-ieee.c */
#define MAX_LITTLENUMS 6
char *
md_atof (type, litP, sizeP)
char type;
char *litP;
int *sizeP;
{
int i,prec;
LITTLENUM_TYPE words[MAX_LITTLENUMS];
LITTLENUM_TYPE *wordP;
char *t;
char *atof_ieee ();
switch (type)
{
case 'f':
case 'F':
case 's':
case 'S':
prec = 2;
break;
case 'd':
case 'D':
case 'r':
case 'R':
prec = 4;
break;
/* FIXME: Some targets allow other format chars for bigger sizes here. */
default:
*sizeP = 0;
return "Bad call to md_atof()";
}
t = atof_ieee (input_line_pointer, type, words);
if (t)
input_line_pointer = t;
*sizeP = prec * sizeof (LITTLENUM_TYPE);
if (target_big_endian)
{
for (i = 0; i < prec; i++)
{
md_number_to_chars (litP, (valueT) words[i], sizeof (LITTLENUM_TYPE));
litP += sizeof (LITTLENUM_TYPE);
}
}
else
{
for (i = prec - 1; i >= 0; i--)
{
md_number_to_chars (litP, (valueT) words[i], sizeof (LITTLENUM_TYPE));
litP += sizeof (LITTLENUM_TYPE);
}
}
return 0;
}
/* Miscellaneous utilities. */
/* Parse a 32 bit floating point number.
The result is those 32 bits as an integer. */
static long
parse_float (pstr, errmsg)
char **pstr;
const char **errmsg;
{
LITTLENUM_TYPE words[MAX_LITTLENUMS];
char *p;
p = atof_ieee (*pstr, 'f', words);
*pstr = p;
return (words[0] << 16) | words[1];
}
/* Scan a symbol and return a pointer to one past the end. */
#define issymchar(ch) (isalnum(ch) || ch == '_')
static char *
scan_symbol (sym)
char *sym;
{
while (*sym && issymchar (*sym))
++sym;
return sym;
}
/* Evaluate an expression.
The result is the value of the expression if it can be evaluated,
or 0 if it cannot (say because some symbols haven't been defined yet)
in which case a fixup is queued.
If OPINDEX is 0, don't queue any fixups, just return 0. */
static long
#ifdef USE_STDARG
eval_expr (int opindex, int offset, const char *fmt, ...)
#else
eval_expr (opindex, offset, fmt, va_alist)
int opindex,offset;
const char *fmt;
va_dcl
#endif
{
long value;
va_list ap;
char *str,*save_input;
expressionS exp;
#ifdef USE_STDARG
va_start (ap, fmt);
#else
va_start (ap);
#endif
vasprintf (&str, fmt, ap);
va_end (ap);
save_input = input_line_pointer;
input_line_pointer = str;
expression (&exp);
input_line_pointer = save_input;
free (str);
if (exp.X_op == O_constant)
value = exp.X_add_number;
else
{
if (opindex != 0)
{
fixups[fixup_count].exp = exp;
fixups[fixup_count].opindex = opindex;
fixups[fixup_count].offset = offset;
++fixup_count;
}
value = 0;
}
return value;
}
/* Create a label named by concatenating PREFIX to NAME. */
static symbolS *
create_label (prefix, name)
const char *prefix, *name;
{
int namelen = strlen (name);
int prefixlen = strlen (prefix);
char *fullname;
symbolS *result;
fullname = xmalloc (prefixlen + namelen + 1);
strcpy (fullname, prefix);
strcat (fullname, name);
result = symbol_find_or_make (fullname);
free (fullname);
return result;
}
/* Create a label named by concatenating PREFIX to NAME,
and define it as `.'.
STO, if non-zero, is the st_other value to assign to this label.
If STO is zero `cur_cpu', call force_mach_label to force record_mach to
emit a cpu label. Otherwise the disassembler gets confused. */
static symbolS *
create_colon_label (sto, prefix, name)
int sto;
const char *prefix, *name;
{
int namelen = strlen (name);
int prefixlen = strlen (prefix);
char *fullname;
symbolS *result;
fullname = xmalloc (prefixlen + namelen + 1);
strcpy (fullname, prefix);
strcat (fullname, name);
result = colon (fullname);
if (sto)
S_SET_OTHER (result, sto);
else
force_mach_label ();
free (fullname);
return result;
}
/* Return a malloc'd string useful in creating unique labels.
PREFIX is the prefix to use or NULL if we're to pick one. */
/* ??? Presumably such a routine already exists somewhere
[but a first pass at finding it didn't turn up anything]. */
static char *
unique_name (prefix)
const char *prefix;
{
static int counter;
char *result;
if (prefix == NULL)
prefix = UNIQUE_LABEL_PREFIX;
asprintf (&result, "%s%d", prefix, counter);
++counter;
return result;
}
/* Compute a value for nloop. */
static int
compute_nloop (type, nregs, bytes)
gif_type type;
int nregs, bytes;
{
int computed_nloop;
switch (type)
{
case GIF_PACKED :
/* We can't compute a value if no regs were specified and there is a
non-zero amount of data. Just set to something useful, a warning
will be issued later. */
if (nregs == 0)
nregs = 1;
computed_nloop = (bytes >> 4) / nregs;
break;
case GIF_REGLIST :
if (nregs == 0)
nregs = 1;
computed_nloop = (bytes >> 3) / nregs;
break;
case GIF_IMAGE :
computed_nloop = bytes >> 4;
break;
}
return computed_nloop;
}
/* Issue a warning if the user specified nloop value doesn't match the
computed value. */
static void
check_nloop (type, nregs, user_nloop, computed_nloop, file, line)
gif_type type;
int nregs,user_nloop,computed_nloop;
char *file;
unsigned int line;
{
if (user_nloop != computed_nloop)
as_warn_where (file, line, "nloop value does not match amount of data");
}
/* Compute the auto-count value for a DMA tag.
INLINE_P is non-zero if the dma data is inline. */
static void
setup_dma_autocount (name, insn_buf, inline_p)
const char *name;
DVP_INSN *insn_buf;
int inline_p;
{
long count;
if (inline_p)
{
/* -1: The count is the number of following quadwords, so skip the one
containing the dma tag. */
count = eval_expr (dma_operand_count, 0,
"((%s%s - %s) >> 4) - 1", END_LABEL_PREFIX, name, name);
}
else
{
/* We don't want to subtract 1 here as the begin and end labels
properly surround the data we want to compute the length of. */
count = eval_expr (dma_operand_count, 0,
"(%s%s - %s) >> 4", END_LABEL_PREFIX, name, name);
}
/* Store the count field. */
insn_buf[0] &= 0xffff0000;
insn_buf[0] |= count & 0x0000ffff;
}
/* Record that inline data follows. */
static void
inline_dma_data (autocount_p, insn_buf)
int autocount_p;
DVP_INSN *insn_buf;
{
if (dma_data_state != 0 )
{
as_bad ("DmaData blocks cannot be nested.");
return;
}
dma_data_state = 1;
if (autocount_p)
{
dma_data_name = S_GET_NAME (create_colon_label (0, "", unique_name (NULL)));
setup_dma_autocount (dma_data_name, insn_buf, 1);
}
else
dma_data_name = 0;
}
/* Compute the auto-count value for a DMA tag with out-of-line data. */
static long
parse_dma_addr_autocount (opcode, operand, mods, insn_buf, pstr, errmsg)
const dvp_opcode *opcode;
const dvp_operand *operand;
int mods;
DVP_INSN *insn_buf;
char **pstr;
const char **errmsg;
{
char *start = *pstr;
char *end = start;
long retval;
/* Data reference must be a .DmaData label. */
symbolS *label, *label2, *endlabel;
const char *name;
char c;
label = label2 = 0;
if (! is_name_beginner (*start))
{
*errmsg = "invalid .DmaData label";
return 0;
}
name = start;
end = scan_symbol (name);
c = *end;
*end = 0;
label = symbol_find_or_make (name);
*end = c;
label2 = create_label ("_$", name);
endlabel = create_label (END_LABEL_PREFIX, name);
retval = eval_expr (dma_operand_addr, 4, name);
setup_dma_autocount (name, insn_buf, 0);
*pstr = end;
return retval;
}
/* Return length in bytes of the variable length VIF insn
currently being assembled. */
static int
cur_vif_insn_length ()
{
int byte_len;
fragS *f;
/* FIXME: A better and less fragile way would be to use eval_expr. */
if (cur_varlen_frag == frag_now)
byte_len = frag_more (0) - cur_varlen_insn - 4; /* -4 for mpg itself */
else
{
byte_len = (cur_varlen_frag->fr_fix
/*+ cur_varlen_frag->fr_offset + cur_varlen_frag->fr_var*/
- (cur_varlen_insn - cur_varlen_frag->fr_literal)) - 4;
for (f = cur_varlen_frag->fr_next; f != frag_now; f = f->fr_next)
byte_len += f->fr_fix /*+ f->fr_offset + f->fr_var*/;
byte_len += frag_now_fix ();
}
return byte_len;
}
/* Install length LEN, in bytes, in the vif insn at BUF.
The bytes in BUF are in target order. */
static void
install_vif_length (buf, len)
char *buf;
int len;
{
char cmd = buf[3];
if ((cmd & 0x70) == 0x40)
{
/* mpg */
len /= 8;
/* ??? Worry about data /= 8 cuts off? */
if (len > 256)
as_bad ("`mpg' data length must be between 1 and 256");
buf[2] = len == 256 ? 0 : len;
}
else if ((cmd & 0x70) == 0x50)
{
/* direct/directhl */
/* ??? Worry about data /= 16 cuts off? */
len /= 16;
if (len > 65536)
as_bad ("`direct' data length must be between 1 and 65536");
len = len == 65536 ? 0 : len;
buf[0] = len;
buf[1] = len >> 8;
}
else if ((cmd & 0x60) == 0x60)
{
/* unpack */
/* Round up to a word boundary. */
len = (len + 3) & ~3;
/* Compute value to insert. */
len = vif_unpack_len_value (cmd & 15, len);
/* -1 is returned if wl,cl are unknown and thus we can't compute
a useful value */
if (len == -1)
{
as_bad ("missing `stcycle', can't compute length of `unpack' insn");
len = 1;
}
if (len > 256)
as_bad ("`unpack' data length must be between 1 and 256");
len = len == 256 ? 0 : len;
buf[2] = len;
}
else
as_fatal ("bad call to install_vif_length");
}
/* Finish off the current set of mpg insns, and start a new set. */
static void
insert_mpg_marker ()
{
s_endmpg (1);
md_assemble ("mpg *,*");
/* Record the cpu type in case we're in the middle of reading binary
data. */
record_mach (DVP_VUUP, 0);
}
/* Insert a file into the output.
The -I arg passed to GAS is used to specify where to find the file.
INSERT_MARKER if non-NULL is called every SIZE bytes. This is used
by the mpg insn to insert mpg's every 256 insns.
The result is the number of bytes inserted.
If an error occurs an error message is printed and zero is returned. */
static int
insert_file (file, insert_marker, size)
const char *file;
void (*insert_marker) ();
int size;
{
FILE *f;
char buf[256];
int i, n, total, left_before_marker;
char *path;
path = xmalloc (strlen (file) + include_dir_maxlen + 5 /*slop*/);
f = NULL;
for (i = 0; i < include_dir_count; i++)
{
strcpy (path, include_dirs[i]);
strcat (path, "/");
strcat (path, file);
if ((f = fopen (path, FOPEN_RB)) != NULL)
break;
}
free (path);
if (f == NULL)
f = fopen (file, FOPEN_RB);
if (f == NULL)
{
as_bad ("unable to read file `%s'", file);
return 0;
}
total = 0;
left_before_marker = 0;
do {
int bytes;
if (insert_marker)
bytes = MIN (size - left_before_marker, sizeof (buf));
else
bytes = sizeof (buf);
n = fread (buf, 1, bytes, f);
if (n > 0)
{
char *fr = frag_more (n);
memcpy (fr, buf, n);
total += n;
if (insert_marker)
{
left_before_marker += n;
if (left_before_marker > size)
as_fatal ("file insertion sanity checky failed");
if (left_before_marker == size)
{
(*insert_marker) ();
left_before_marker = 0;
}
}
}
} while (n > 0);
fclose (f);
/* We assume the file is smaller than 2^31 bytes.
Ok, we shouldn't make any assumptions. */
return total;
}
/* Insert an operand value into an instruction. */
static void
insert_operand (cpu, opcode, operand, mods, insn_buf, val, errmsg)
dvp_cpu cpu;
const dvp_opcode *opcode;
const dvp_operand *operand;
int mods;
DVP_INSN *insn_buf;
offsetT val;
const char **errmsg;
{
if (operand->insert)
{
(*operand->insert) (opcode, operand, mods, insn_buf, (long) val, errmsg);
}
else
{
/* We currently assume a field does not cross a word boundary. */
int shift = ((mods & DVP_MOD_THIS_WORD)
? (operand->shift & 31)
: operand->shift);
/* FIXME: revisit */
if (operand->word == 0)
{
int word = (mods & DVP_MOD_THIS_WORD) ? 0 : (shift / 32);
if (operand->bits == 32)
insn_buf[word] = val;
else
{
shift = shift % 32;
insn_buf[word] |= ((long) val & ((1 << operand->bits) - 1)) << shift;
}
}
else
{
int word = (mods & DVP_MOD_THIS_WORD) ? 0 : operand->word;
if (operand->bits == 32)
insn_buf[word] = val;
else
{
long temp = (long) val & ((1 << operand->bits) - 1);
insn_buf[word] |= temp << operand->shift;
}
}
}
}
/* Insert an operand's final value into an instruction.
Here we can give warning messages about operand values if we want to. */
static void
insert_operand_final (cpu, operand, mods, insn_buf, val, file, line)
dvp_cpu cpu;
const dvp_operand *operand;
int mods;
DVP_INSN *insn_buf;
offsetT val;
char *file;
unsigned int line;
{
if (operand->bits != 32)
{
offsetT min, max, test;
if ((operand->flags & DVP_OPERAND_RELATIVE_BRANCH) != 0)
{
if ((val & 7) != 0)
{
if (file == (char *) NULL)
as_warn ("branch to misaligned address");
else
as_warn_where (file, line, "branch to misaligned address");
}
val >>= 3;
}
if ((operand->flags & DVP_OPERAND_SIGNED) != 0)
{
if ((operand->flags & DVP_OPERAND_SIGNOPT) != 0)
max = (1 << operand->bits) - 1;
else
max = (1 << (operand->bits - 1)) - 1;
min = - (1 << (operand->bits - 1));
}
else
{
max = (1 << operand->bits) - 1;
min = 0;
}
if ((operand->flags & DVP_OPERAND_NEGATIVE) != 0)
test = - val;
else
test = val;
if (test < (offsetT) min || test > (offsetT) max)
{
const char *err =
"operand out of range (%s not between %ld and %ld)";
char buf[100];
sprint_value (buf, test);
if (file == (char *) NULL)
as_warn (err, buf, min, max);
else
as_warn_where (file, line, err, buf, min, max);
}
}
{
const char *errmsg = NULL;
insert_operand (cpu, NULL, operand, mods, insn_buf, val, &errmsg);
if (errmsg != NULL)
as_warn_where (file, line, errmsg);
}
}
/* DVP pseudo ops. */
static void
s_dmadata (ignore)
int ignore;
{
char *name, c;
dma_data_name = 0;
if (dma_data_state != 0)
{
as_bad ("DmaData blocks cannot be nested.");
ignore_rest_of_line ();
return;
}
dma_data_state = 1;
SKIP_WHITESPACE (); /* Leading whitespace is part of operand. */
name = input_line_pointer;
if (!is_name_beginner (*name))
{
as_bad ("invalid identifier for \".DmaData\"");
ignore_rest_of_line ();
return;
}
c = get_symbol_end ();
line_label = colon (name); /* user-defined label */
dma_data_name = S_GET_NAME (line_label);
*input_line_pointer = c;
/* Force emission of a machine type label for the next insn. */
force_mach_label ();
demand_empty_rest_of_line ();
}
static void
s_enddmadata (ignore)
int ignore;
{
if (dma_data_state != 1)
{
as_warn (".EndDmaData encountered outside a DmaData block -- ignored.");
ignore_rest_of_line ();
dma_data_name = 0;
}
dma_data_state = 0;
demand_empty_rest_of_line ();
/* If count provided, verify it is correct. */
/* ... */
/* "label" points to beginning of block.
Create a name for the final label like _$<name>. */
if (dma_data_name)
{
/* Fill the data out to a multiple of 16 bytes. */
/* FIXME: Are the fill contents right? */
frag_align (4, 0, 0);
create_colon_label (0, END_LABEL_PREFIX, dma_data_name);
}
}
static void
s_dmapackvif (ignore)
int ignore;
{
/* Syntax: .dmapackvif 0|1 */
/* Leading whitespace is part of operand. */
SKIP_WHITESPACE ();
switch (*input_line_pointer++)
{
case '0':
dma_pack_vif_p = 0;
break;
case '1':
dma_pack_vif_p = 1;
break;
default:
as_bad ("illegal argument to `.dmapackvif'");
}
demand_empty_rest_of_line ();
}
/* INTERNAL_P is non-zero if invoked internally by this file rather than
by the user. In this case we don't touch the input stream. */
static void
s_enddirect (internal_p)
int internal_p;
{
int byte_len;
if (CUR_ASM_STATE != ASM_DIRECT)
{
as_bad ("`.enddirect' has no matching `direct' instruction");
return;
}
byte_len = cur_vif_insn_length ();
if (cur_varlen_value != -1
&& cur_varlen_value * 16 != byte_len)
as_warn ("length in `direct' instruction does not match length of data");
if (output_vif)
install_vif_length (cur_varlen_insn, byte_len);
set_asm_state (ASM_INIT);
/* These needn't be reset, but to catch bugs they are. */
cur_varlen_frag = NULL;
cur_varlen_insn = NULL;
cur_varlen_value = 0;
if (! internal_p)
demand_empty_rest_of_line ();
}
/* INTERNAL_P is non-zero if invoked internally by this file rather than
by the user. In this case we don't touch the input stream. */
static void
s_endmpg (internal_p)
int internal_p;
{
int byte_len;
if (CUR_ASM_STATE != ASM_MPG)
{
as_bad ("`.endmpg' has no matching `mpg' instruction");
return;
}
byte_len = cur_vif_insn_length ();
if (cur_varlen_value != -1
&& cur_varlen_value * 8 != byte_len)
as_warn ("length in `mpg' instruction does not match length of data");
if (output_vif)
install_vif_length (cur_varlen_insn, byte_len);
set_asm_state (ASM_INIT);
/* These needn't be reset, but to catch bugs they are. */
cur_varlen_frag = NULL;
cur_varlen_insn = NULL;
cur_varlen_value = 0;
/* Reset the vu insn counter. */
vu_count = -1;
/* Update $.MpgLoc. */
vif_set_mpgloc (vif_get_mpgloc () + byte_len);
if (! internal_p)
demand_empty_rest_of_line ();
}
/* INTERNAL_P is non-zero if invoked internally by this file rather than
by the user. In this case we don't touch the input stream. */
static void
s_endunpack (internal_p)
int internal_p;
{
int byte_len;
if (CUR_ASM_STATE != ASM_UNPACK)
{
as_bad ("`.endunpack' has no matching `unpack' instruction");
return;
}
byte_len = cur_vif_insn_length ();
/* Round up to next word boundary. */
if (byte_len % 4)
frag_align (2, 0, 0);
#if 0 /* unpack doesn't support prespecifying a length */
if (cur_varlen_value * 16 != bytelen)
as_warn ("length in `direct' instruction does not match length of data");
#endif
if (output_vif)
install_vif_length (cur_varlen_insn, byte_len);
set_asm_state (ASM_INIT);
/* These needn't be reset, but to catch bugs they are. */
cur_varlen_frag = NULL;
cur_varlen_insn = NULL;
cur_varlen_value = 0;
/* Update $.UnpackLoc. */
vif_set_unpackloc (vif_get_unpackloc () + byte_len);
if (! internal_p)
demand_empty_rest_of_line ();
}
static void
s_endgif (ignore)
int ignore;
{
int bytes;
int specified_nloop = gif_nloop ();
int computed_nloop;
int nregs = gif_nregs ();
char *file;
unsigned int line;
as_where (&file, &line);
if (CUR_ASM_STATE != ASM_GIF)
{
as_bad (".endgif doesn't follow a gif tag");
return;
}
pop_asm_state (0);
/* Fill out to proper boundary.
??? This may cause eval_expr to always queue a fixup. So be it. */
switch (gif_insn_type)
{
case GIF_PACKED : frag_align (4, 0, 0); break;
case GIF_REGLIST : frag_align (3, 0, 0); break;
case GIF_IMAGE : frag_align (4, 0, 0); break;
}
/* The -16 is because the `gif_data_name' label is emitted at the start
of the gif tag. If we're in a different frag from the one we started
with, this can't be computed until much later. To cope we queue a fixup
and deal with it then.
??? The other way to handle this is by having expr() compute "syma - symb"
when they're in different fragments but the difference is constant.
Not sure how much of a slowdown that will introduce though. */
fixup_count = 0;
bytes = eval_expr (gif_operand_nloop, 0, ". - %s - 16", gif_data_name);
/* Compute a value for nloop if we can. */
if (fixup_count == 0)
{
computed_nloop = compute_nloop (gif_insn_type, nregs, bytes);
/* If the user specified nloop, verify it. */
if (specified_nloop != -1)
check_nloop (gif_insn_type, nregs, specified_nloop, computed_nloop,
file, line);
}
/* If computation of nloop can't be done yet, queue a fixup and do it later.
Otherwise validate nloop if specified or write the computed value into
the insn. */
if (fixup_count != 0)
{
/* FIXME: It might eventually be possible to combine all the various
copies of this bit of code. */
int op_type, reloc_type, offset;
const dvp_operand *operand;
fixS *fix;
op_type = fixups[0].opindex;
offset = fixups[0].offset;
reloc_type = encode_fixup_reloc_type (DVP_GIF, op_type);
operand = &gif_operands[op_type];
fix = fix_new_exp (gif_insn_frag,
gif_insn_frag_loc + offset - gif_insn_frag->fr_literal,
4, &fixups[0].exp, 0,
(bfd_reloc_code_real_type) reloc_type);
/* Record user specified value so we can test it when we compute the
actual value. */
fix->tc_fix_data.type = gif_insn_type;
fix->tc_fix_data.nregs = nregs;
fix->tc_fix_data.user_nloop = specified_nloop;
}
else if (specified_nloop != -1)
; /* nothing to do */
else
{
DVP_INSN insn = bfd_getl32 (gif_insn_frag_loc);
insert_operand_final (DVP_GIF, &gif_operands[gif_operand_nloop],
DVP_MOD_THIS_WORD, &insn,
(offsetT) computed_nloop, file, line);
bfd_putl32 ((bfd_vma) insn, gif_insn_frag_loc);
}
gif_data_name = NULL;
demand_empty_rest_of_line ();
}
static void
s_state (state)
int state;
{
/* If in MPG state and the user requests to change to VU state,
leave the state as MPG. This happens when we see an mpg followed
by a .include that has .vu. */
if (CUR_ASM_STATE == ASM_MPG && state == ASM_VU)
return;
set_asm_state (state);
demand_empty_rest_of_line ();
}
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