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binutils-gdb/gas/config/tc-msp430.c
Nick Clifton 99b4a5a085 Fixes a snafu checking the size of 20-bit immedaite values. 
* config/tc-msp430.c (msp430_srcoperand): Fix range test for
	20-bit values.
2014-11-03 11:15:53 +00:00

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/* tc-msp430.c -- Assembler code for the Texas Instruments MSP430
Copyright (C) 2002-2014 Free Software Foundation, Inc.
Contributed by Dmitry Diky <diwil@mail.ru>
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 3, 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, 51 Franklin Street - Fifth Floor,
Boston, MA 02110-1301, USA. */
#include "as.h"
#include <limits.h>
#define PUSH_1X_WORKAROUND
#include "subsegs.h"
#include "opcode/msp430.h"
#include "safe-ctype.h"
#include "dwarf2dbg.h"
#include "elf/msp430.h"
/* We will disable polymorphs by default because it is dangerous.
The potential problem here is the following: assume we got the
following code:
jump .l1
nop
jump subroutine ; external symbol
.l1:
nop
ret
In case of assembly time relaxation we'll get:
0: jmp .l1 <.text +0x08> (reloc deleted)
2: nop
4: br subroutine
.l1:
8: nop
10: ret
If the 'subroutine' is within +-1024 bytes range then linker
will produce:
0: jmp .text +0x08
2: nop
4: jmp subroutine
.l1:
6: nop
8: ret ; 'jmp .text +0x08' will land here. WRONG!!!
The workaround is the following:
1. Declare global var enable_polymorphs which set to 1 via option -mp.
2. Declare global var enable_relax which set to 1 via option -mQ.
If polymorphs are enabled, and relax isn't, treat all jumps as long jumps,
do not delete any relocs and leave them for linker.
If relax is enabled, relax at assembly time and kill relocs as necessary. */
int msp430_enable_relax;
int msp430_enable_polys;
/* Set linkrelax here to avoid fixups in most sections. */
int linkrelax = 1;
/* GCC uses the some condition codes which we'll
implement as new polymorph instructions.
COND EXPL SHORT JUMP LONG JUMP
===============================================
eq == jeq jne +4; br lab
ne != jne jeq +4; br lab
ltn honours no-overflow flag
ltn < jn jn +2; jmp +4; br lab
lt < jl jge +4; br lab
ltu < jlo lhs +4; br lab
le <= see below
leu <= see below
gt > see below
gtu > see below
ge >= jge jl +4; br lab
geu >= jhs jlo +4; br lab
===============================================
Therefore, new opcodes are (BranchEQ -> beq; and so on...)
beq,bne,blt,bltn,bltu,bge,bgeu
'u' means unsigned compares
Also, we add 'jump' instruction:
jump UNCOND -> jmp br lab
They will have fmt == 4, and insn_opnumb == number of instruction. */
struct rcodes_s
{
char * name;
int index; /* Corresponding insn_opnumb. */
int sop; /* Opcode if jump length is short. */
long lpos; /* Label position. */
long lop0; /* Opcode 1 _word_ (16 bits). */
long lop1; /* Opcode second word. */
long lop2; /* Opcode third word. */
};
#define MSP430_RLC(n,i,sop,o1) \
{#n, i, sop, 2, (o1 + 2), 0x4010, 0}
static struct rcodes_s msp430_rcodes[] =
{
MSP430_RLC (beq, 0, 0x2400, 0x2000),
MSP430_RLC (bne, 1, 0x2000, 0x2400),
MSP430_RLC (blt, 2, 0x3800, 0x3400),
MSP430_RLC (bltu, 3, 0x2800, 0x2c00),
MSP430_RLC (bge, 4, 0x3400, 0x3800),
MSP430_RLC (bgeu, 5, 0x2c00, 0x2800),
{"bltn", 6, 0x3000, 3, 0x3000 + 1, 0x3c00 + 2,0x4010},
{"jump", 7, 0x3c00, 1, 0x4010, 0, 0},
{0,0,0,0,0,0,0}
};
#undef MSP430_RLC
#define MSP430_RLC(n,i,sop,o1) \
{#n, i, sop, 2, (o1 + 2), 0x0030, 0}
static struct rcodes_s msp430x_rcodes[] =
{
MSP430_RLC (beq, 0, 0x2400, 0x2000),
MSP430_RLC (bne, 1, 0x2000, 0x2400),
MSP430_RLC (blt, 2, 0x3800, 0x3400),
MSP430_RLC (bltu, 3, 0x2800, 0x2c00),
MSP430_RLC (bge, 4, 0x3400, 0x3800),
MSP430_RLC (bgeu, 5, 0x2c00, 0x2800),
{"bltn", 6, 0x3000, 3, 0x0030 + 1, 0x3c00 + 2, 0x3000},
{"jump", 7, 0x3c00, 1, 0x0030, 0, 0},
{0,0,0,0,0,0,0}
};
#undef MSP430_RLC
/* More difficult than above and they have format 5.
COND EXPL SHORT LONG
=================================================================
gt > jeq +2; jge label jeq +6; jl +4; br label
gtu > jeq +2; jhs label jeq +6; jlo +4; br label
leu <= jeq label; jlo label jeq +2; jhs +4; br label
le <= jeq label; jl label jeq +2; jge +4; br label
================================================================= */
struct hcodes_s
{
char * name;
int index; /* Corresponding insn_opnumb. */
int tlab; /* Number of labels in short mode. */
int op0; /* Opcode for first word of short jump. */
int op1; /* Opcode for second word of short jump. */
int lop0; /* Opcodes for long jump mode. */
int lop1;
int lop2;
};
static struct hcodes_s msp430_hcodes[] =
{
{"bgt", 0, 1, 0x2401, 0x3400, 0x2403, 0x3802, 0x4010 },
{"bgtu", 1, 1, 0x2401, 0x2c00, 0x2403, 0x2802, 0x4010 },
{"bleu", 2, 2, 0x2400, 0x2800, 0x2401, 0x2c02, 0x4010 },
{"ble", 3, 2, 0x2400, 0x3800, 0x2401, 0x3402, 0x4010 },
{0,0,0,0,0,0,0,0}
};
static struct hcodes_s msp430x_hcodes[] =
{
{"bgt", 0, 1, 0x2401, 0x3400, 0x2403, 0x3802, 0x0030 },
{"bgtu", 1, 1, 0x2401, 0x2c00, 0x2403, 0x2802, 0x0030 },
{"bleu", 2, 2, 0x2400, 0x2800, 0x2401, 0x2c02, 0x0030 },
{"ble", 3, 2, 0x2400, 0x3800, 0x2401, 0x3402, 0x0030 },
{0,0,0,0,0,0,0,0}
};
const char comment_chars[] = ";";
const char line_comment_chars[] = "#";
const char line_separator_chars[] = "{";
const char EXP_CHARS[] = "eE";
const char FLT_CHARS[] = "dD";
/* Handle long expressions. */
extern LITTLENUM_TYPE generic_bignum[];
static struct hash_control *msp430_hash;
/* Relaxations. */
#define STATE_UNCOND_BRANCH 1 /* jump */
#define STATE_NOOV_BRANCH 3 /* bltn */
#define STATE_SIMPLE_BRANCH 2 /* bne, beq, etc... */
#define STATE_EMUL_BRANCH 4
#define CNRL 2
#define CUBL 4
#define CNOL 8
#define CSBL 6
#define CEBL 4
/* Length. */
#define STATE_BITS10 1 /* wild guess. short jump */
#define STATE_WORD 2 /* 2 bytes pc rel. addr. more */
#define STATE_UNDEF 3 /* cannot handle this yet. convert to word mode */
#define ENCODE_RELAX(what,length) (((what) << 2) + (length))
#define RELAX_STATE(s) ((s) & 3)
#define RELAX_LEN(s) ((s) >> 2)
#define RELAX_NEXT(a,b) ENCODE_RELAX (a, b + 1)
relax_typeS md_relax_table[] =
{
/* Unused. */
{1, 1, 0, 0},
{1, 1, 0, 0},
{1, 1, 0, 0},
{1, 1, 0, 0},
/* Unconditional jump. */
{1, 1, 8, 5},
{1024, -1024, CNRL, RELAX_NEXT (STATE_UNCOND_BRANCH, STATE_BITS10)}, /* state 10 bits displ */
{0, 0, CUBL, RELAX_NEXT (STATE_UNCOND_BRANCH, STATE_WORD)}, /* state word */
{1, 1, CUBL, 0}, /* state undef */
/* Simple branches. */
{0, 0, 8, 9},
{1024, -1024, CNRL, RELAX_NEXT (STATE_SIMPLE_BRANCH, STATE_BITS10)}, /* state 10 bits displ */
{0, 0, CSBL, RELAX_NEXT (STATE_SIMPLE_BRANCH, STATE_WORD)}, /* state word */
{1, 1, CSBL, 0},
/* blt no overflow branch. */
{1, 1, 8, 13},
{1024, -1024, CNRL, RELAX_NEXT (STATE_NOOV_BRANCH, STATE_BITS10)}, /* state 10 bits displ */
{0, 0, CNOL, RELAX_NEXT (STATE_NOOV_BRANCH, STATE_WORD)}, /* state word */
{1, 1, CNOL, 0},
/* Emulated branches. */
{1, 1, 8, 17},
{1020, -1020, CEBL, RELAX_NEXT (STATE_EMUL_BRANCH, STATE_BITS10)}, /* state 10 bits displ */
{0, 0, CNOL, RELAX_NEXT (STATE_EMUL_BRANCH, STATE_WORD)}, /* state word */
{1, 1, CNOL, 0}
};
#define MAX_OP_LEN 256
typedef enum msp_isa
{
MSP_ISA_430,
MSP_ISA_430X,
MSP_ISA_430Xv2
} msp_isa;
static enum msp_isa selected_isa = MSP_ISA_430Xv2;
static inline bfd_boolean
target_is_430x (void)
{
return selected_isa >= MSP_ISA_430X;
}
static inline bfd_boolean
target_is_430xv2 (void)
{
return selected_isa == MSP_ISA_430Xv2;
}
/* Generate an absolute 16-bit relocation.
For the 430X we generate a relocation without linker range checking
if the value is being used in an extended (ie 20-bit) instruction,
otherwise if have a shifted expression we use a HI reloc.
For the 430 we generate a relocation without assembler range checking
if we are handling an immediate value or a byte-width instruction. */
#undef CHECK_RELOC_MSP430
#define CHECK_RELOC_MSP430(OP) \
(target_is_430x () \
? (extended_op \
? BFD_RELOC_16 \
: ((OP).vshift == 1) \
? BFD_RELOC_MSP430_ABS_HI16 \
: BFD_RELOC_MSP430X_ABS16) \
: ((imm_op || byte_op) \
? BFD_RELOC_MSP430_16_BYTE : BFD_RELOC_MSP430_16))
/* Generate a 16-bit pc-relative relocation.
For the 430X we generate a relocation without linkwer range checking.
For the 430 we generate a relocation without assembler range checking
if we are handling an immediate value or a byte-width instruction. */
#undef CHECK_RELOC_MSP430_PCREL
#define CHECK_RELOC_MSP430_PCREL \
(target_is_430x () \
? BFD_RELOC_MSP430X_PCR16 \
: (imm_op || byte_op) \
? BFD_RELOC_MSP430_16_PCREL_BYTE : BFD_RELOC_MSP430_16_PCREL)
/* Profiling capability:
It is a performance hit to use gcc's profiling approach for this tiny target.
Even more -- jtag hardware facility does not perform any profiling functions.
However we've got gdb's built-in simulator where we can do anything.
Therefore my suggestion is:
We define new section ".profiler" which holds all profiling information.
We define new pseudo operation .profiler which will instruct assembler to
add new profile entry to the object file. Profile should take place at the
present address.
Pseudo-op format:
.profiler flags,function_to_profile [, cycle_corrector, extra]
where 'flags' is a combination of the following chars:
s - function Start
x - function eXit
i - function is in Init section
f - function is in Fini section
l - Library call
c - libC standard call
d - stack value Demand (saved at run-time in simulator)
I - Interrupt service routine
P - Prologue start
p - Prologue end
E - Epilogue start
e - Epilogue end
j - long Jump/ sjlj unwind
a - an Arbitrary code fragment
t - exTra parameter saved (constant value like frame size)
'""' optional: "sil" == sil
function_to_profile - function's address
cycle_corrector - a value which should be added to the cycle
counter, zero if omitted
extra - some extra parameter, zero if omitted.
For example:
------------------------------
.global fxx
.type fxx,@function
fxx:
.LFrameOffset_fxx=0x08
.profiler "scdP", fxx ; function entry.
; we also demand stack value to be displayed
push r11
push r10
push r9
push r8
.profiler "cdp",fxx,0, .LFrameOffset_fxx ; check stack value at this point
; (this is a prologue end)
; note, that spare var filled with the frame size
mov r15,r8
....
.profiler cdE,fxx ; check stack
pop r8
pop r9
pop r10
pop r11
.profiler xcde,fxx,3 ; exit adds 3 to the cycle counter
ret ; cause 'ret' insn takes 3 cycles
-------------------------------
This profiling approach does not produce any overhead and
absolutely harmless.
So, even profiled code can be uploaded to the MCU. */
#define MSP430_PROFILER_FLAG_ENTRY 1 /* s */
#define MSP430_PROFILER_FLAG_EXIT 2 /* x */
#define MSP430_PROFILER_FLAG_INITSECT 4 /* i */
#define MSP430_PROFILER_FLAG_FINISECT 8 /* f */
#define MSP430_PROFILER_FLAG_LIBCALL 0x10 /* l */
#define MSP430_PROFILER_FLAG_STDCALL 0x20 /* c */
#define MSP430_PROFILER_FLAG_STACKDMD 0x40 /* d */
#define MSP430_PROFILER_FLAG_ISR 0x80 /* I */
#define MSP430_PROFILER_FLAG_PROLSTART 0x100 /* P */
#define MSP430_PROFILER_FLAG_PROLEND 0x200 /* p */
#define MSP430_PROFILER_FLAG_EPISTART 0x400 /* E */
#define MSP430_PROFILER_FLAG_EPIEND 0x800 /* e */
#define MSP430_PROFILER_FLAG_JUMP 0x1000 /* j */
#define MSP430_PROFILER_FLAG_FRAGMENT 0x2000 /* a */
#define MSP430_PROFILER_FLAG_EXTRA 0x4000 /* t */
#define MSP430_PROFILER_FLAG_notyet 0x8000 /* ? */
static int
pow2value (int y)
{
int n = 0;
unsigned int x;
x = y;
if (!x)
return 1;
for (; x; x = x >> 1)
if (x & 1)
n++;
return n == 1;
}
/* Parse ordinary expression. */
static char *
parse_exp (char * s, expressionS * op)
{
input_line_pointer = s;
expression (op);
if (op->X_op == O_absent)
as_bad (_("missing operand"));
return input_line_pointer;
}
/* Delete spaces from s: X ( r 1 2) => X(r12). */
static void
del_spaces (char * s)
{
while (*s)
{
if (ISSPACE (*s))
{
char *m = s + 1;
while (ISSPACE (*m) && *m)
m++;
memmove (s, m, strlen (m) + 1);
}
else
s++;
}
}
static inline char *
skip_space (char * s)
{
while (ISSPACE (*s))
++s;
return s;
}
/* Extract one word from FROM and copy it to TO. Delimiters are ",;\n" */
static char *
extract_operand (char * from, char * to, int limit)
{
int size = 0;
/* Drop leading whitespace. */
from = skip_space (from);
while (size < limit && *from)
{
*(to + size) = *from;
if (*from == ',' || *from == ';' || *from == '\n')
break;
from++;
size++;
}
*(to + size) = 0;
del_spaces (to);
from++;
return from;
}
static void
msp430_profiler (int dummy ATTRIBUTE_UNUSED)
{
char buffer[1024];
char f[32];
char * str = buffer;
char * flags = f;
int p_flags = 0;
char * halt;
int ops = 0;
int left;
char * s;
segT seg;
int subseg;
char * end = 0;
expressionS exp;
expressionS exp1;
s = input_line_pointer;
end = input_line_pointer;
while (*end && *end != '\n')
end++;
while (*s && *s != '\n')
{
if (*s == ',')
ops++;
s++;
}
left = 3 - ops;
if (ops < 1)
{
as_bad (_(".profiler pseudo requires at least two operands."));
input_line_pointer = end;
return;
}
input_line_pointer = extract_operand (input_line_pointer, flags, 32);
while (*flags)
{
switch (*flags)
{
case '"':
break;
case 'a':
p_flags |= MSP430_PROFILER_FLAG_FRAGMENT;
break;
case 'j':
p_flags |= MSP430_PROFILER_FLAG_JUMP;
break;
case 'P':
p_flags |= MSP430_PROFILER_FLAG_PROLSTART;
break;
case 'p':
p_flags |= MSP430_PROFILER_FLAG_PROLEND;
break;
case 'E':
p_flags |= MSP430_PROFILER_FLAG_EPISTART;
break;
case 'e':
p_flags |= MSP430_PROFILER_FLAG_EPIEND;
break;
case 's':
p_flags |= MSP430_PROFILER_FLAG_ENTRY;
break;
case 'x':
p_flags |= MSP430_PROFILER_FLAG_EXIT;
break;
case 'i':
p_flags |= MSP430_PROFILER_FLAG_INITSECT;
break;
case 'f':
p_flags |= MSP430_PROFILER_FLAG_FINISECT;
break;
case 'l':
p_flags |= MSP430_PROFILER_FLAG_LIBCALL;
break;
case 'c':
p_flags |= MSP430_PROFILER_FLAG_STDCALL;
break;
case 'd':
p_flags |= MSP430_PROFILER_FLAG_STACKDMD;
break;
case 'I':
p_flags |= MSP430_PROFILER_FLAG_ISR;
break;
case 't':
p_flags |= MSP430_PROFILER_FLAG_EXTRA;
break;
default:
as_warn (_("unknown profiling flag - ignored."));
break;
}
flags++;
}
if (p_flags
&& ( ! pow2value (p_flags & ( MSP430_PROFILER_FLAG_ENTRY
| MSP430_PROFILER_FLAG_EXIT))
|| ! pow2value (p_flags & ( MSP430_PROFILER_FLAG_PROLSTART
| MSP430_PROFILER_FLAG_PROLEND
| MSP430_PROFILER_FLAG_EPISTART
| MSP430_PROFILER_FLAG_EPIEND))
|| ! pow2value (p_flags & ( MSP430_PROFILER_FLAG_INITSECT
| MSP430_PROFILER_FLAG_FINISECT))))
{
as_bad (_("ambiguous flags combination - '.profiler' directive ignored."));
input_line_pointer = end;
return;
}
/* Generate temp symbol which denotes current location. */
if (now_seg == absolute_section) /* Paranoia ? */
{
exp1.X_op = O_constant;
exp1.X_add_number = abs_section_offset;
as_warn (_("profiling in absolute section?"));
}
else
{
exp1.X_op = O_symbol;
exp1.X_add_symbol = symbol_temp_new_now ();
exp1.X_add_number = 0;
}
/* Generate a symbol which holds flags value. */
exp.X_op = O_constant;
exp.X_add_number = p_flags;
/* Save current section. */
seg = now_seg;
subseg = now_subseg;
/* Now go to .profiler section. */
obj_elf_change_section (".profiler", SHT_PROGBITS, 0, 0, 0, 0, 0);
/* Save flags. */
emit_expr (& exp, 2);
/* Save label value. */
emit_expr (& exp1, 2);
while (ops--)
{
/* Now get profiling info. */
halt = extract_operand (input_line_pointer, str, 1024);
/* Process like ".word xxx" directive. */
parse_exp (str, & exp);
emit_expr (& exp, 2);
input_line_pointer = halt;
}
/* Fill the rest with zeros. */
exp.X_op = O_constant;
exp.X_add_number = 0;
while (left--)
emit_expr (& exp, 2);
/* Return to current section. */
subseg_set (seg, subseg);
}
static char *
extract_word (char * from, char * to, int limit)
{
char *op_end;
int size = 0;
/* Drop leading whitespace. */
from = skip_space (from);
*to = 0;
/* Find the op code end. */
for (op_end = from; *op_end != 0 && is_part_of_name (*op_end);)
{
to[size++] = *op_end++;
if (size + 1 >= limit)
break;
}
to[size] = 0;
return op_end;
}
#define OPTION_MMCU 'm'
#define OPTION_RELAX 'Q'
#define OPTION_POLYMORPHS 'P'
#define OPTION_LARGE 'l'
static bfd_boolean large_model = FALSE;
#define OPTION_NO_INTR_NOPS 'N'
#define OPTION_INTR_NOPS 'n'
static bfd_boolean gen_interrupt_nops = FALSE;
#define OPTION_WARN_INTR_NOPS 'y'
#define OPTION_NO_WARN_INTR_NOPS 'Y'
static bfd_boolean warn_interrupt_nops = TRUE;
#define OPTION_MCPU 'c'
#define OPTION_MOVE_DATA 'd'
static bfd_boolean move_data = FALSE;
static void
msp430_set_arch (int option)
{
char *str = (char *) alloca (32); /* 32 for good measure. */
input_line_pointer = extract_word (input_line_pointer, str, 32);
md_parse_option (option, str);
bfd_set_arch_mach (stdoutput, TARGET_ARCH,
target_is_430x () ? bfd_mach_msp430x : bfd_mach_msp11);
}
/* This is the full list of MCU names that are known to only
support the 430 ISA. */
static const char * msp430_mcu_names [] =
{
"msp430afe221", "msp430afe222", "msp430afe223", "msp430afe231",
"msp430afe232", "msp430afe233", "msp430afe251", "msp430afe252",
"msp430afe253", "msp430c091", "msp430c092", "msp430c111",
"msp430c1111", "msp430c112", "msp430c1121", "msp430c1331",
"msp430c1351", "msp430c311s", "msp430c312", "msp430c313",
"msp430c314", "msp430c315", "msp430c323", "msp430c325",
"msp430c336", "msp430c337", "msp430c412", "msp430c413",
"msp430e112", "msp430e313", "msp430e315", "msp430e325",
"msp430e337", "msp430f110", "msp430f1101", "msp430f1101a",
"msp430f1111", "msp430f1111a", "msp430f112", "msp430f1121",
"msp430f1121a", "msp430f1122", "msp430f1132", "msp430f122",
"msp430f1222", "msp430f123", "msp430f1232", "msp430f133",
"msp430f135", "msp430f147", "msp430f1471", "msp430f148",
"msp430f1481", "msp430f149", "msp430f1491", "msp430f155",
"msp430f156", "msp430f157", "msp430f1610", "msp430f1611",
"msp430f1612", "msp430f167", "msp430f168", "msp430f169",
"msp430f2001", "msp430f2002", "msp430f2003", "msp430f2011",
"msp430f2012", "msp430f2013", "msp430f2101", "msp430f2111",
"msp430f2112", "msp430f2121", "msp430f2122", "msp430f2131",
"msp430f2132", "msp430f2232", "msp430f2234", "msp430f2252",
"msp430f2254", "msp430f2272", "msp430f2274", "msp430f233",
"msp430f2330", "msp430f235", "msp430f2350", "msp430f2370",
"msp430f2410", "msp430f247", "msp430f2471", "msp430f248",
"msp430f2481", "msp430f249", "msp430f2491", "msp430f412",
"msp430f413", "msp430f4132", "msp430f415", "msp430f4152",
"msp430f417", "msp430f423", "msp430f423a", "msp430f425",
"msp430f4250", "msp430f425a", "msp430f4260", "msp430f427",
"msp430f4270", "msp430f427a", "msp430f435", "msp430f4351",
"msp430f436", "msp430f4361", "msp430f437", "msp430f4371",
"msp430f438", "msp430f439", "msp430f447", "msp430f448",
"msp430f4481", "msp430f449", "msp430f4491", "msp430f477",
"msp430f478", "msp430f4783", "msp430f4784", "msp430f479",
"msp430f4793", "msp430f4794", "msp430fe423", "msp430fe4232",
"msp430fe423a", "msp430fe4242", "msp430fe425", "msp430fe4252",
"msp430fe425a", "msp430fe427", "msp430fe4272", "msp430fe427a",
"msp430fg4250", "msp430fg4260", "msp430fg4270", "msp430fg437",
"msp430fg438", "msp430fg439", "msp430fg477", "msp430fg478",
"msp430fg479", "msp430fw423", "msp430fw425", "msp430fw427",
"msp430fw428", "msp430fw429", "msp430g2001", "msp430g2101",
"msp430g2102", "msp430g2111", "msp430g2112", "msp430g2113",
"msp430g2121", "msp430g2131", "msp430g2132", "msp430g2152",
"msp430g2153", "msp430g2201", "msp430g2202", "msp430g2203",
"msp430g2210", "msp430g2211", "msp430g2212", "msp430g2213",
"msp430g2221", "msp430g2230", "msp430g2231", "msp430g2232",
"msp430g2233", "msp430g2252", "msp430g2253", "msp430g2302",
"msp430g2303", "msp430g2312", "msp430g2313", "msp430g2332",
"msp430g2333", "msp430g2352", "msp430g2353", "msp430g2402",
"msp430g2403", "msp430g2412", "msp430g2413", "msp430g2432",
"msp430g2433", "msp430g2444", "msp430g2452", "msp430g2453",
"msp430g2513", "msp430g2533", "msp430g2544", "msp430g2553",
"msp430g2744", "msp430g2755", "msp430g2855", "msp430g2955",
"msp430i2020", "msp430i2021", "msp430i2030", "msp430i2031",
"msp430i2040", "msp430i2041", "msp430l092", "msp430p112",
"msp430p313", "msp430p315", "msp430p315s", "msp430p325",
"msp430p337", "msp430tch5e"
};
int
md_parse_option (int c, char * arg)
{
switch (c)
{
case OPTION_MMCU:
if (arg == NULL)
as_fatal (_("MCU option requires a name\n"));
if (strcasecmp ("msp430", arg) == 0)
selected_isa = MSP_ISA_430;
else if (strcasecmp ("msp430xv2", arg) == 0)
selected_isa = MSP_ISA_430Xv2;
else if (strcasecmp ("msp430x", arg) == 0)
selected_isa = MSP_ISA_430X;
else
{
int i;
for (i = sizeof msp430_mcu_names / sizeof msp430_mcu_names[0]; i--;)
if (strcasecmp (msp430_mcu_names[i], arg) == 0)
{
selected_isa = MSP_ISA_430;
break;
}
}
/* It is not an error if we do not match the MCU name. */
return 1;
case OPTION_MCPU:
if (strcmp (arg, "430") == 0
|| strcasecmp (arg, "msp430") == 0)
selected_isa = MSP_ISA_430;
else if (strcasecmp (arg, "430x") == 0
|| strcasecmp (arg, "msp430x") == 0)
selected_isa = MSP_ISA_430X;
else if (strcasecmp (arg, "430xv2") == 0
|| strcasecmp (arg, "msp430xv2") == 0)
selected_isa = MSP_ISA_430Xv2;
else
as_fatal (_("unrecognised argument to -mcpu option '%s'"), arg);
return 1;
case OPTION_RELAX:
msp430_enable_relax = 1;
return 1;
case OPTION_POLYMORPHS:
msp430_enable_polys = 1;
return 1;
case OPTION_LARGE:
large_model = TRUE;
return 1;
case OPTION_NO_INTR_NOPS:
gen_interrupt_nops = FALSE;
return 1;
case OPTION_INTR_NOPS:
gen_interrupt_nops = TRUE;
return 1;
case OPTION_WARN_INTR_NOPS:
warn_interrupt_nops = TRUE;
return 1;
case OPTION_NO_WARN_INTR_NOPS:
warn_interrupt_nops = FALSE;
return 1;
case OPTION_MOVE_DATA:
move_data = TRUE;
return 1;
}
return 0;
}
/* The intention here is to have the mere presence of these sections
cause the object to have a reference to a well-known symbol. This
reference pulls in the bits of the runtime (crt0) that initialize
these sections. Thus, for example, the startup code to call
memset() to initialize .bss will only be linked in when there is a
non-empty .bss section. Otherwise, the call would exist but have a
zero length parameter, which is a waste of memory and cycles.
The code which initializes these sections should have a global
label for these symbols, and should be marked with KEEP() in the
linker script.
*/
static void
msp430_section (int arg)
{
char * saved_ilp = input_line_pointer;
char * name = obj_elf_section_name ();
if (strncmp (name, ".bss", 4) == 0
|| strncmp (name, ".gnu.linkonce.b.", 16) == 0)
(void) symbol_find_or_make ("__crt0_init_bss");
if (strncmp (name, ".data", 5) == 0
|| strncmp (name, ".gnu.linkonce.d.", 16) == 0)
(void) symbol_find_or_make ("__crt0_movedata");
input_line_pointer = saved_ilp;
obj_elf_section (arg);
}
void
msp430_frob_section (asection *sec)
{
const char *name = sec->name;
if (sec->size == 0)
return;
if (strncmp (name, ".bss", 4) == 0
|| strncmp (name, ".gnu.linkonce.b.", 16) == 0)
(void) symbol_find_or_make ("__crt0_init_bss");
if (strncmp (name, ".data", 5) == 0
|| strncmp (name, ".gnu.linkonce.d.", 16) == 0)
(void) symbol_find_or_make ("__crt0_movedata");
}
static void
msp430_lcomm (int ignore ATTRIBUTE_UNUSED)
{
symbolS *symbolP = s_comm_internal (0, s_lcomm_internal);
if (symbolP)
symbol_get_bfdsym (symbolP)->flags |= BSF_OBJECT;
(void) symbol_find_or_make ("__crt0_init_bss");
}
static void
msp430_comm (int needs_align)
{
s_comm_internal (needs_align, elf_common_parse);
(void) symbol_find_or_make ("__crt0_init_bss");
}
static void
msp430_refsym (int arg ATTRIBUTE_UNUSED)
{
char sym_name[1024];
input_line_pointer = extract_word (input_line_pointer, sym_name, 1024);
(void) symbol_find_or_make (sym_name);
}
const pseudo_typeS md_pseudo_table[] =
{
{"arch", msp430_set_arch, OPTION_MMCU},
{"cpu", msp430_set_arch, OPTION_MCPU},
{"profiler", msp430_profiler, 0},
{"section", msp430_section, 0},
{"section.s", msp430_section, 0},
{"sect", msp430_section, 0},
{"sect.s", msp430_section, 0},
{"pushsection", msp430_section, 1},
{"refsym", msp430_refsym, 0},
{"comm", msp430_comm, 0},
{"lcomm", msp430_lcomm, 0},
{NULL, NULL, 0}
};
const char *md_shortopts = "mm:,mP,mQ,ml,mN,mn,my,mY";
struct option md_longopts[] =
{
{"mmcu", required_argument, NULL, OPTION_MMCU},
{"mcpu", required_argument, NULL, OPTION_MCPU},
{"mP", no_argument, NULL, OPTION_POLYMORPHS},
{"mQ", no_argument, NULL, OPTION_RELAX},
{"ml", no_argument, NULL, OPTION_LARGE},
{"mN", no_argument, NULL, OPTION_NO_INTR_NOPS},
{"mn", no_argument, NULL, OPTION_INTR_NOPS},
{"mY", no_argument, NULL, OPTION_NO_WARN_INTR_NOPS},
{"my", no_argument, NULL, OPTION_WARN_INTR_NOPS},
{"md", no_argument, NULL, OPTION_MOVE_DATA},
{NULL, no_argument, NULL, 0}
};
size_t md_longopts_size = sizeof (md_longopts);
void
md_show_usage (FILE * stream)
{
fprintf (stream,
_("MSP430 options:\n"
" -mmcu=<msp430-name> - select microcontroller type\n"
" -mcpu={430|430x|430xv2} - select microcontroller architecture\n"));
fprintf (stream,
_(" -mQ - enable relaxation at assembly time. DANGEROUS!\n"
" -mP - enable polymorph instructions\n"));
fprintf (stream,
_(" -ml - enable large code model\n"));
fprintf (stream,
_(" -mN - do not insert NOPs after changing interrupts (default)\n"));
fprintf (stream,
_(" -mn - insert a NOP after changing interrupts\n"));
fprintf (stream,
_(" -mY - do not warn about missing NOPs after changing interrupts\n"));
fprintf (stream,
_(" -my - warn about missing NOPs after changing interrupts (default)\n"));
fprintf (stream,
_(" -md - Force copying of data from ROM to RAM at startup\n"));
}
symbolS *
md_undefined_symbol (char * name ATTRIBUTE_UNUSED)
{
return NULL;
}
static char *
extract_cmd (char * from, char * to, int limit)
{
int size = 0;
while (*from && ! ISSPACE (*from) && *from != '.' && limit > size)
{
*(to + size) = *from;
from++;
size++;
}
*(to + size) = 0;
return from;
}
char *
md_atof (int type, char * litP, int * sizeP)
{
return ieee_md_atof (type, litP, sizeP, FALSE);
}
void
md_begin (void)
{
struct msp430_opcode_s * opcode;
msp430_hash = hash_new ();
for (opcode = msp430_opcodes; opcode->name; opcode++)
hash_insert (msp430_hash, opcode->name, (char *) opcode);
bfd_set_arch_mach (stdoutput, TARGET_ARCH,
target_is_430x () ? bfd_mach_msp430x : bfd_mach_msp11);
}
/* Returns the register number equivalent to the string T.
Returns -1 if there is no such register.
Skips a leading 'r' or 'R' character if there is one.
Handles the register aliases PC and SP. */
static signed int
check_reg (char * t)
{
signed int val;
if (t == NULL)
return -1;
if (*t == 'r' || *t == 'R')
++t;
if (strncasecmp (t, "pc", 2) == 0)
return 0;
if (strncasecmp (t, "sp", 2) == 0)
return 1;
if (strncasecmp (t, "sr", 2) == 0)
return 2;
if (*t == '0')
return 0;
val = atoi (t);
if (val < 1 || val > 15)
return -1;
return val;
}
static int
msp430_srcoperand (struct msp430_operand_s * op,
char * l,
int bin,
bfd_boolean * imm_op,
bfd_boolean allow_20bit_values,
bfd_boolean constants_allowed)
{
char *__tl = l;
/* Check if an immediate #VALUE. The hash sign should be only at the beginning! */
if (*l == '#')
{
char *h = l;
int vshift = -1;
int rval = 0;
/* Check if there is:
llo(x) - least significant 16 bits, x &= 0xffff
lhi(x) - x = (x >> 16) & 0xffff,
hlo(x) - x = (x >> 32) & 0xffff,
hhi(x) - x = (x >> 48) & 0xffff
The value _MUST_ be constant expression: #hlo(1231231231). */
*imm_op = TRUE;
if (strncasecmp (h, "#llo(", 5) == 0)
{
vshift = 0;
rval = 3;
}
else if (strncasecmp (h, "#lhi(", 5) == 0)
{
vshift = 1;
rval = 3;
}
else if (strncasecmp (h, "#hlo(", 5) == 0)
{
vshift = 2;
rval = 3;
}
else if (strncasecmp (h, "#hhi(", 5) == 0)
{
vshift = 3;
rval = 3;
}
else if (strncasecmp (h, "#lo(", 4) == 0)
{
vshift = 0;
rval = 2;
}
else if (strncasecmp (h, "#hi(", 4) == 0)
{
vshift = 1;
rval = 2;
}
op->reg = 0; /* Reg PC. */
op->am = 3;
op->ol = 1; /* Immediate will follow an instruction. */
__tl = h + 1 + rval;
op->mode = OP_EXP;
op->vshift = vshift;
parse_exp (__tl, &(op->exp));
if (op->exp.X_op == O_constant)
{
int x = op->exp.X_add_number;
if (vshift == 0)
{
x = x & 0xffff;
op->exp.X_add_number = x;
}
else if (vshift == 1)
{
x = (x >> 16) & 0xffff;
op->exp.X_add_number = x;
op->vshift = 0;
}
else if (vshift > 1)
{
if (x < 0)
op->exp.X_add_number = -1;
else
op->exp.X_add_number = 0; /* Nothing left. */
x = op->exp.X_add_number;
op->vshift = 0;
}
if (allow_20bit_values)
{
if (op->exp.X_add_number > 0xfffff || op->exp.X_add_number < -524288)
{
as_bad (_("value 0x%x out of extended range."), x);
return 1;
}
}
else if (op->exp.X_add_number > 65535 || op->exp.X_add_number < -32768)
{
as_bad (_("value %d out of range. Use #lo() or #hi()"), x);
return 1;
}
/* Now check constants. */
/* Substitute register mode with a constant generator if applicable. */
if (!allow_20bit_values)
x = (short) x; /* Extend sign. */
if (! constants_allowed)
;
else if (x == 0)
{
op->reg = 3;
op->am = 0;
op->ol = 0;
op->mode = OP_REG;
}
else if (x == 1)
{
op->reg = 3;
op->am = 1;
op->ol = 0;
op->mode = OP_REG;
}
else if (x == 2)
{
op->reg = 3;
op->am = 2;
op->ol = 0;
op->mode = OP_REG;
}
else if (x == -1)
{
op->reg = 3;
op->am = 3;
op->ol = 0;
op->mode = OP_REG;
}
else if (x == 4)
{
#ifdef PUSH_1X_WORKAROUND
if (bin == 0x1200)
{
/* Remove warning as confusing.
as_warn (_("Hardware push bug workaround")); */
}
else
#endif
{
op->reg = 2;
op->am = 2;
op->ol = 0;
op->mode = OP_REG;
}
}
else if (x == 8)
{
#ifdef PUSH_1X_WORKAROUND
if (bin == 0x1200)
{
/* Remove warning as confusing.
as_warn (_("Hardware push bug workaround")); */
}
else
#endif
{
op->reg = 2;
op->am = 3;
op->ol = 0;
op->mode = OP_REG;
}
}
}
else if (op->exp.X_op == O_symbol)
{
if (vshift > 1)
as_bad (_("error: unsupported #foo() directive used on symbol"));
op->mode = OP_EXP;
}
else if (op->exp.X_op == O_big)
{
short x;
if (vshift != -1)
{
op->exp.X_op = O_constant;
op->exp.X_add_number = 0xffff & generic_bignum[vshift];
x = op->exp.X_add_number;
op->vshift = 0;
}
else
{
as_bad (_
("unknown expression in operand %s. use #llo() #lhi() #hlo() #hhi() "),
l);
return 1;
}
if (x == 0)
{
op->reg = 3;
op->am = 0;
op->ol = 0;
op->mode = OP_REG;
}
else if (x == 1)
{
op->reg = 3;
op->am = 1;
op->ol = 0;
op->mode = OP_REG;
}
else if (x == 2)
{
op->reg = 3;
op->am = 2;
op->ol = 0;
op->mode = OP_REG;
}
else if (x == -1)
{
op->reg = 3;
op->am = 3;
op->ol = 0;
op->mode = OP_REG;
}
else if (x == 4)
{
op->reg = 2;
op->am = 2;
op->ol = 0;
op->mode = OP_REG;
}
else if (x == 8)
{
op->reg = 2;
op->am = 3;
op->ol = 0;
op->mode = OP_REG;
}
}
/* Redundant (yet) check. */
else if (op->exp.X_op == O_register)
as_bad
(_("Registers cannot be used within immediate expression [%s]"), l);
else
as_bad (_("unknown operand %s"), l);
return 0;
}
/* Check if absolute &VALUE (assume that we can construct something like ((a&b)<<7 + 25). */
if (*l == '&')
{
char *h = l;
op->reg = 2; /* reg 2 in absolute addr mode. */
op->am = 1; /* mode As == 01 bin. */
op->ol = 1; /* Immediate value followed by instruction. */
__tl = h + 1;
parse_exp (__tl, &(op->exp));
op->mode = OP_EXP;
op->vshift = 0;
if (op->exp.X_op == O_constant)
{
int x = op->exp.X_add_number;
if (allow_20bit_values)
{
if (x > 0xfffff || x < -(0x7ffff))
{
as_bad (_("value 0x%x out of extended range."), x);
return 1;
}
}
else if (x > 65535 || x < -32768)
{
as_bad (_("value out of range: 0x%x"), x);
return 1;
}
}
else if (op->exp.X_op == O_symbol)
;
else
{
/* Redundant (yet) check. */
if (op->exp.X_op == O_register)
as_bad
(_("Registers cannot be used within absolute expression [%s]"), l);
else
as_bad (_("unknown expression in operand %s"), l);
return 1;
}
return 0;
}
/* Check if indirect register mode @Rn / postincrement @Rn+. */
if (*l == '@')
{
char *t = l;
char *m = strchr (l, '+');
if (t != l)
{
as_bad (_("unknown addressing mode %s"), l);
return 1;
}
t++;
if ((op->reg = check_reg (t)) == -1)
{
as_bad (_("Bad register name %s"), t);
return 1;
}
op->mode = OP_REG;
op->am = m ? 3 : 2;
op->ol = 0;
/* PC cannot be used in indirect addressing. */
if (target_is_430xv2 () && op->reg == 0)
{
as_bad (_("cannot use indirect addressing with the PC"));
return 1;
}
return 0;
}
/* Check if register indexed X(Rn). */
do
{
char *h = strrchr (l, '(');
char *m = strrchr (l, ')');
char *t;
*imm_op = TRUE;
if (!h)
break;
if (!m)
{
as_bad (_("')' required"));
return 1;
}
t = h;
op->am = 1;
op->ol = 1;
/* Extract a register. */
if ((op->reg = check_reg (t + 1)) == -1)
{
as_bad (_
("unknown operator %s. Did you mean X(Rn) or #[hl][hl][oi](CONST) ?"),
l);
return 1;
}
if (op->reg == 2)
{
as_bad (_("r2 should not be used in indexed addressing mode"));
return 1;
}
/* Extract constant. */
__tl = l;
*h = 0;
op->mode = OP_EXP;
op->vshift = 0;
parse_exp (__tl, &(op->exp));
if (op->exp.X_op == O_constant)
{
int x = op->exp.X_add_number;
if (allow_20bit_values)
{
if (x > 0xfffff || x < - (0x7ffff))
{
as_bad (_("value 0x%x out of extended range."), x);
return 1;
}
}
else if (x > 65535 || x < -32768)
{
as_bad (_("value out of range: 0x%x"), x);
return 1;
}
if (x == 0)
{
op->mode = OP_REG;
op->am = 2;
op->ol = 0;
return 0;
}
}
else if (op->exp.X_op == O_symbol)
;
else
{
/* Redundant (yet) check. */
if (op->exp.X_op == O_register)
as_bad
(_("Registers cannot be used as a prefix of indexed expression [%s]"), l);
else
as_bad (_("unknown expression in operand %s"), l);
return 1;
}
return 0;
}
while (0);
/* Possibly register mode 'mov r1,r2'. */
if ((op->reg = check_reg (l)) != -1)
{
op->mode = OP_REG;
op->am = 0;
op->ol = 0;
return 0;
}
/* Symbolic mode 'mov a, b' == 'mov x(pc), y(pc)'. */
do
{
op->mode = OP_EXP;
op->reg = 0; /* PC relative... be careful. */
/* An expression starting with a minus sign is a constant, not an address. */
op->am = (*l == '-' ? 3 : 1);
op->ol = 1;
op->vshift = 0;
__tl = l;
parse_exp (__tl, &(op->exp));
return 0;
}
while (0);
/* Unreachable. */
as_bad (_("unknown addressing mode for operand %s"), l);
return 1;
}
static int
msp430_dstoperand (struct msp430_operand_s * op,
char * l,
int bin,
bfd_boolean allow_20bit_values,
bfd_boolean constants_allowed)
{
int dummy;
int ret = msp430_srcoperand (op, l, bin, & dummy,
allow_20bit_values,
constants_allowed);
if (ret)
return ret;
if (op->am == 2)
{
char *__tl = "0";
op->mode = OP_EXP;
op->am = 1;
op->ol = 1;
op->vshift = 0;
parse_exp (__tl, &(op->exp));
if (op->exp.X_op != O_constant || op->exp.X_add_number != 0)
{
as_bad (_("Internal bug. Try to use 0(r%d) instead of @r%d"),
op->reg, op->reg);
return 1;
}
return 0;
}
if (op->am > 1)
{
as_bad (_
("this addressing mode is not applicable for destination operand"));
return 1;
}
return 0;
}
/* Attempt to encode a MOVA instruction with the given operands.
Returns the length of the encoded instruction if successful
or 0 upon failure. If the encoding fails, an error message
will be returned if a pointer is provided. */
static int
try_encode_mova (bfd_boolean imm_op,
int bin,
struct msp430_operand_s * op1,
struct msp430_operand_s * op2,
const char ** error_message_return)
{
short ZEROS = 0;
char *frag;
int where;
/* Only a restricted subset of the normal MSP430 addressing modes
are supported here, so check for the ones that are allowed. */
if (imm_op)
{
if (op1->mode == OP_EXP)
{
if (op2->mode != OP_REG)
{
if (error_message_return != NULL)
* error_message_return = _("expected register as second argument of %s");
return 0;
}
if (op1->am == 3)
{
/* MOVA #imm20, Rdst. */
bin |= 0x80 | op2->reg;
frag = frag_more (4);
where = frag - frag_now->fr_literal;
if (op1->exp.X_op == O_constant)
{
bin |= ((op1->exp.X_add_number >> 16) & 0xf) << 8;
bfd_putl16 ((bfd_vma) bin, frag);
bfd_putl16 (op1->exp.X_add_number & 0xffff, frag + 2);
}
else
{
bfd_putl16 ((bfd_vma) bin, frag);
fix_new_exp (frag_now, where, 4, &(op1->exp), FALSE,
BFD_RELOC_MSP430X_ABS20_ADR_SRC);
bfd_putl16 ((bfd_vma) ZEROS, frag + 2);
}
return 4;
}
else if (op1->am == 1)
{
/* MOVA z16(Rsrc), Rdst. */
bin |= 0x30 | (op1->reg << 8) | op2->reg;
frag = frag_more (4);
where = frag - frag_now->fr_literal;
bfd_putl16 ((bfd_vma) bin, frag);
if (op1->exp.X_op == O_constant)
{
if (op1->exp.X_add_number > 0xffff
|| op1->exp.X_add_number < -(0x7fff))
{
if (error_message_return != NULL)
* error_message_return = _("index value too big for %s");
return 0;
}
bfd_putl16 (op1->exp.X_add_number & 0xffff, frag + 2);
}
else
{
bfd_putl16 ((bfd_vma) ZEROS, frag + 2);
fix_new_exp (frag_now, where + 2, 2, &(op1->exp), FALSE,
op1->reg == 0 ?
BFD_RELOC_MSP430X_PCR16 :
BFD_RELOC_MSP430X_ABS16);
}
return 4;
}
if (error_message_return != NULL)
* error_message_return = _("unexpected addressing mode for %s");
return 0;
}
else if (op1->am == 0)
{
/* MOVA Rsrc, ... */
if (op2->mode == OP_REG)
{
bin |= 0xc0 | (op1->reg << 8) | op2->reg;
frag = frag_more (2);
where = frag - frag_now->fr_literal;
bfd_putl16 ((bfd_vma) bin, frag);
return 2;
}
else if (op2->am == 1)
{
if (op2->reg == 2)
{
/* MOVA Rsrc, &abs20. */
bin |= 0x60 | (op1->reg << 8);
frag = frag_more (4);
where = frag - frag_now->fr_literal;
if (op2->exp.X_op == O_constant)
{
bin |= (op2->exp.X_add_number >> 16) & 0xf;
bfd_putl16 ((bfd_vma) bin, frag);
bfd_putl16 (op2->exp.X_add_number & 0xffff, frag + 2);
}
else
{
bfd_putl16 ((bfd_vma) bin, frag);
bfd_putl16 ((bfd_vma) ZEROS, frag + 2);
fix_new_exp (frag_now, where, 4, &(op2->exp), FALSE,
BFD_RELOC_MSP430X_ABS20_ADR_DST);
}
return 4;
}
/* MOVA Rsrc, z16(Rdst). */
bin |= 0x70 | (op1->reg << 8) | op2->reg;
frag = frag_more (4);
where = frag - frag_now->fr_literal;
bfd_putl16 ((bfd_vma) bin, frag);
if (op2->exp.X_op == O_constant)
{
if (op2->exp.X_add_number > 0xffff
|| op2->exp.X_add_number < -(0x7fff))
{
if (error_message_return != NULL)
* error_message_return = _("index value too big for %s");
return 0;
}
bfd_putl16 (op2->exp.X_add_number & 0xffff, frag + 2);
}
else
{
bfd_putl16 ((bfd_vma) ZEROS, frag + 2);
fix_new_exp (frag_now, where + 2, 2, &(op2->exp), FALSE,
op2->reg == 0 ?
BFD_RELOC_MSP430X_PCR16 :
BFD_RELOC_MSP430X_ABS16);
}
return 4;
}
if (error_message_return != NULL)
* error_message_return = _("unexpected addressing mode for %s");
return 0;
}
}
/* imm_op == FALSE. */
if (op1->reg == 2 && op1->am == 1 && op1->mode == OP_EXP)
{
/* MOVA &abs20, Rdst. */
if (op2->mode != OP_REG)
{
if (error_message_return != NULL)
* error_message_return = _("expected register as second argument of %s");
return 0;
}
if (op2->reg == 2 || op2->reg == 3)
{
if (error_message_return != NULL)
* error_message_return = _("constant generator destination register found in %s");
return 0;
}
bin |= 0x20 | op2->reg;
frag = frag_more (4);
where = frag - frag_now->fr_literal;
if (op1->exp.X_op == O_constant)
{
bin |= ((op1->exp.X_add_number >> 16) & 0xf) << 8;
bfd_putl16 ((bfd_vma) bin, frag);
bfd_putl16 (op1->exp.X_add_number & 0xffff, frag + 2);
}
else
{
bfd_putl16 ((bfd_vma) bin, frag);
bfd_putl16 ((bfd_vma) ZEROS, frag + 2);
fix_new_exp (frag_now, where, 4, &(op1->exp), FALSE,
BFD_RELOC_MSP430X_ABS20_ADR_SRC);
}
return 4;
}
else if (op1->mode == OP_REG)
{
if (op1->am == 3)
{
/* MOVA @Rsrc+, Rdst. */
if (op2->mode != OP_REG)
{
if (error_message_return != NULL)
* error_message_return = _("expected register as second argument of %s");
return 0;
}
if (op2->reg == 2 || op2->reg == 3)
{
if (error_message_return != NULL)
* error_message_return = _("constant generator destination register found in %s");
return 0;
}
if (op1->reg == 2 || op1->reg == 3)
{
if (error_message_return != NULL)
* error_message_return = _("constant generator source register found in %s");
return 0;
}
bin |= 0x10 | (op1->reg << 8) | op2->reg;
frag = frag_more (2);
where = frag - frag_now->fr_literal;
bfd_putl16 ((bfd_vma) bin, frag);
return 2;
}
else if (op1->am == 2)
{
/* MOVA @Rsrc,Rdst */
if (op2->mode != OP_REG)
{
if (error_message_return != NULL)
* error_message_return = _("expected register as second argument of %s");
return 0;
}
if (op2->reg == 2 || op2->reg == 3)
{
if (error_message_return != NULL)
* error_message_return = _("constant generator destination register found in %s");
return 0;
}
if (op1->reg == 2 || op1->reg == 3)
{
if (error_message_return != NULL)
* error_message_return = _("constant generator source register found in %s");
return 0;
}
bin |= (op1->reg << 8) | op2->reg;
frag = frag_more (2);
where = frag - frag_now->fr_literal;
bfd_putl16 ((bfd_vma) bin, frag);
return 2;
}
}
if (error_message_return != NULL)
* error_message_return = _("unexpected addressing mode for %s");
return 0;
}
static bfd_boolean check_for_nop = FALSE;
#define is_opcode(NAME) (strcmp (opcode->name, NAME) == 0)
/* Parse instruction operands.
Return binary opcode. */
static unsigned int
msp430_operands (struct msp430_opcode_s * opcode, char * line)
{
int bin = opcode->bin_opcode; /* Opcode mask. */
int insn_length = 0;
char l1[MAX_OP_LEN], l2[MAX_OP_LEN];
char *frag;
int where;
struct msp430_operand_s op1, op2;
int res = 0;
static short ZEROS = 0;
bfd_boolean byte_op, imm_op;
int op_length = 0;
int fmt;
int extended = 0x1800;
bfd_boolean extended_op = FALSE;
bfd_boolean addr_op;
const char * error_message;
static signed int repeat_count = 0;
bfd_boolean fix_emitted;
bfd_boolean nop_check_needed = FALSE;
/* Opcode is the one from opcodes table
line contains something like
[.w] @r2+, 5(R1)
or
.b @r2+, 5(R1). */
byte_op = FALSE;
addr_op = FALSE;
if (*line == '.')
{
bfd_boolean check = FALSE;
++ line;
switch (TOLOWER (* line))
{
case 'b':
/* Byte operation. */
bin |= BYTE_OPERATION;
byte_op = TRUE;
check = TRUE;
break;
case 'a':
/* "Address" ops work on 20-bit values. */
addr_op = TRUE;
bin |= BYTE_OPERATION;
check = TRUE;
break;
case 'w':
/* Word operation - this is the default. */
check = TRUE;
break;
case 0:
case ' ':
case '\n':
case '\r':
as_warn (_("no size modifier after period, .w assumed"));
break;
default:
as_bad (_("unrecognised instruction size modifier .%c"),
* line);
return 0;
}
if (check)
{
++ line;
}
}
if (*line && ! ISSPACE (*line))
{
as_bad (_("junk found after instruction: %s.%s"),
opcode->name, line);
return 0;
}
/* Catch the case where the programmer has used a ".a" size modifier on an
instruction that does not support it. Look for an alternative extended
instruction that has the same name without the period. Eg: "add.a"
becomes "adda". Although this not an officially supported way of
specifing instruction aliases other MSP430 assemblers allow it. So we
support it for compatibility purposes. */
if (addr_op && opcode->fmt >= 0)
{
char * old_name = opcode->name;
char real_name[32];
sprintf (real_name, "%sa", old_name);
opcode = hash_find (msp430_hash, real_name);
if (opcode == NULL)
{
as_bad (_("instruction %s.a does not exist"), old_name);
return 0;
}
#if 0 /* Enable for debugging. */
as_warn ("treating %s.a as %s", old_name, real_name);
#endif
addr_op = FALSE;
bin = opcode->bin_opcode;
}
if (opcode->fmt != -1
&& opcode->insn_opnumb
&& (!*line || *line == '\n'))
{
as_bad (_("instruction %s requires %d operand(s)"),
opcode->name, opcode->insn_opnumb);
return 0;
}
memset (l1, 0, sizeof (l1));
memset (l2, 0, sizeof (l2));
memset (&op1, 0, sizeof (op1));
memset (&op2, 0, sizeof (op2));
imm_op = FALSE;
if ((fmt = opcode->fmt) < 0)
{
if (! target_is_430x ())
{
as_bad (_("instruction %s requires MSP430X mcu"),
opcode->name);
return 0;
}
fmt = (-fmt) - 1;
extended_op = TRUE;
}
if (repeat_count)
{
/* If requested set the extended instruction repeat count. */
if (extended_op)
{
if (repeat_count > 0)
extended |= (repeat_count - 1);
else
extended |= (1 << 7) | (- repeat_count);
}
else
as_bad (_("unable to repeat %s insn"), opcode->name);
repeat_count = 0;
}
if (check_for_nop && is_opcode ("nop"))
check_for_nop = FALSE;
switch (fmt)
{
case 0: /* Emulated. */
switch (opcode->insn_opnumb)
{
case 0:
if (is_opcode ("eint") || is_opcode ("dint"))
{
if (check_for_nop)
{
if (warn_interrupt_nops)
{
if (gen_interrupt_nops)
as_warn (_("NOP inserted between two instructions that change interrupt state"));
else
as_warn (_("a NOP might be needed here because of successive changes in interrupt state"));
}
if (gen_interrupt_nops)
{
/* Emit a NOP between interrupt enable/disable.
See 1.3.4.1 of the MSP430x5xx User Guide. */
insn_length += 2;
frag = frag_more (2);
bfd_putl16 ((bfd_vma) 0x4303 /* NOP */, frag);
}
}
nop_check_needed = TRUE;
}
/* Set/clear bits instructions. */
if (extended_op)
{
if (!addr_op)
extended |= BYTE_OPERATION;
/* Emit the extension word. */
insn_length += 2;
frag = frag_more (2);
bfd_putl16 (extended, frag);
}
insn_length += 2;
frag = frag_more (2);
bfd_putl16 ((bfd_vma) bin, frag);
dwarf2_emit_insn (insn_length);
break;
case 1:
/* Something which works with destination operand. */
line = extract_operand (line, l1, sizeof (l1));
res = msp430_dstoperand (&op1, l1, opcode->bin_opcode, extended_op, TRUE);
if (res)
break;
bin |= (op1.reg | (op1.am << 7));
if (is_opcode ("clr") && bin == 0x4302 /* CLR R2*/)
{
if (check_for_nop)
{
if (warn_interrupt_nops)
{
if (gen_interrupt_nops)
as_warn (_("NOP inserted between two instructions that change interrupt state"));
else
as_warn (_("a NOP might be needed here because of successive changes in interrupt state"));
}
if (gen_interrupt_nops)
{
/* Emit a NOP between interrupt enable/disable.
See 1.3.4.1 of the MSP430x5xx User Guide. */
insn_length += 2;
frag = frag_more (2);
bfd_putl16 ((bfd_vma) 0x4303 /* NOP */, frag);
}
}
nop_check_needed = TRUE;
}
/* Compute the entire instruction length, in bytes. */
op_length = (extended_op ? 2 : 0) + 2 + (op1.ol * 2);
insn_length += op_length;
frag = frag_more (op_length);
where = frag - frag_now->fr_literal;
if (extended_op)
{
if (!addr_op)
extended |= BYTE_OPERATION;
if (op1.ol != 0 && ((extended & 0xf) != 0))
{
as_bad (_("repeat instruction used with non-register mode instruction"));
extended &= ~ 0xf;
}
if (op1.mode == OP_EXP)
{
if (op1.exp.X_op == O_constant)
extended |= ((op1.exp.X_add_number >> 16) & 0xf) << 7;
else if (op1.reg || (op1.reg == 0 && op1.am == 3)) /* Not PC relative. */
fix_new_exp (frag_now, where, 6, &(op1.exp), FALSE,
BFD_RELOC_MSP430X_ABS20_EXT_SRC);
else
fix_new_exp (frag_now, where, 6, &(op1.exp), FALSE,
BFD_RELOC_MSP430X_PCR20_EXT_SRC);
}
/* Emit the extension word. */
bfd_putl16 (extended, frag);
frag += 2;
where += 2;
}
bfd_putl16 ((bfd_vma) bin, frag);
frag += 2;
where += 2;
if (op1.mode == OP_EXP)
{
if (op1.exp.X_op == O_constant)
{
bfd_putl16 (op1.exp.X_add_number & 0xffff, frag);
}
else
{
bfd_putl16 ((bfd_vma) ZEROS, frag);
if (!extended_op)
{
if (op1.reg)
fix_new_exp (frag_now, where, 2,
&(op1.exp), FALSE, CHECK_RELOC_MSP430 (op1));
else
fix_new_exp (frag_now, where, 2,
&(op1.exp), TRUE, CHECK_RELOC_MSP430_PCREL);
}
}
}
dwarf2_emit_insn (insn_length);
break;
case 2:
/* Shift instruction. */
line = extract_operand (line, l1, sizeof (l1));
strncpy (l2, l1, sizeof (l2));
l2[sizeof (l2) - 1] = '\0';
res = msp430_srcoperand (&op1, l1, opcode->bin_opcode, &imm_op, extended_op, TRUE);
res += msp430_dstoperand (&op2, l2, opcode->bin_opcode, extended_op, TRUE);
if (res)
break; /* An error occurred. All warnings were done before. */
insn_length = (extended_op ? 2 : 0) + 2 + (op1.ol * 2) + (op2.ol * 2);
frag = frag_more (insn_length);
where = frag - frag_now->fr_literal;
if (target_is_430xv2 ()
&& op1.mode == OP_REG
&& op1.reg == 0
&& (is_opcode ("rlax")
|| is_opcode ("rlcx")
|| is_opcode ("rla")
|| is_opcode ("rlc")))
{
as_bad (_("%s: attempt to rotate the PC register"), opcode->name);
break;
}
if (extended_op)
{
if (!addr_op)
extended |= BYTE_OPERATION;
if ((op1.ol != 0 || op2.ol != 0) && ((extended & 0xf) != 0))
{
as_bad (_("repeat instruction used with non-register mode instruction"));
extended &= ~ 0xf;
}
if (op1.mode == OP_EXP)
{
if (op1.exp.X_op == O_constant)
extended |= ((op1.exp.X_add_number >> 16) & 0xf) << 7;
else if (op1.reg || (op1.reg == 0 && op1.am == 3)) /* Not PC relative. */
fix_new_exp (frag_now, where, 6, &(op1.exp), FALSE,
BFD_RELOC_MSP430X_ABS20_EXT_SRC);
else
fix_new_exp (frag_now, where, 6, &(op1.exp), FALSE,
BFD_RELOC_MSP430X_PCR20_EXT_SRC);
}
if (op2.mode == OP_EXP)
{
if (op2.exp.X_op == O_constant)
extended |= (op2.exp.X_add_number >> 16) & 0xf;
else if (op1.mode == OP_EXP)
fix_new_exp (frag_now, where, 8, &(op2.exp), FALSE,
op2.reg ? BFD_RELOC_MSP430X_ABS20_EXT_ODST
: BFD_RELOC_MSP430X_PCR20_EXT_ODST);
else
fix_new_exp (frag_now, where, 6, &(op2.exp), FALSE,
op2.reg ? BFD_RELOC_MSP430X_ABS20_EXT_DST
: BFD_RELOC_MSP430X_PCR20_EXT_DST);
}
/* Emit the extension word. */
bfd_putl16 (extended, frag);
frag += 2;
where += 2;
}
bin |= (op2.reg | (op1.reg << 8) | (op1.am << 4) | (op2.am << 7));
bfd_putl16 ((bfd_vma) bin, frag);
frag += 2;
where += 2;
if (op1.mode == OP_EXP)
{
if (op1.exp.X_op == O_constant)
{
bfd_putl16 (op1.exp.X_add_number & 0xffff, frag);
}
else
{
bfd_putl16 ((bfd_vma) ZEROS, frag);
if (!extended_op)
{
if (op1.reg || (op1.reg == 0 && op1.am == 3)) /* Not PC relative. */
fix_new_exp (frag_now, where, 2,
&(op1.exp), FALSE, CHECK_RELOC_MSP430 (op1));
else
fix_new_exp (frag_now, where, 2,
&(op1.exp), TRUE, CHECK_RELOC_MSP430_PCREL);
}
}
frag += 2;
where += 2;
}
if (op2.mode == OP_EXP)
{
if (op2.exp.X_op == O_constant)
{
bfd_putl16 (op2.exp.X_add_number & 0xffff, frag);
}
else
{
bfd_putl16 ((bfd_vma) ZEROS, frag);
if (!extended_op)
{
if (op2.reg) /* Not PC relative. */
fix_new_exp (frag_now, where, 2,
&(op2.exp), FALSE, CHECK_RELOC_MSP430 (op2));
else
fix_new_exp (frag_now, where, 2,
&(op2.exp), TRUE, CHECK_RELOC_MSP430_PCREL);
}
}
}
dwarf2_emit_insn (insn_length);
break;
case 3:
/* Branch instruction => mov dst, r0. */
if (extended_op)
{
as_bad ("Internal error: state 0/3 not coded for extended instructions");
break;
}
line = extract_operand (line, l1, sizeof (l1));
res = msp430_srcoperand (&op1, l1, opcode->bin_opcode, &imm_op, extended_op, FALSE);
if (res)
break;
byte_op = FALSE;
imm_op = FALSE;
bin |= ((op1.reg << 8) | (op1.am << 4));
op_length = 2 + 2 * op1.ol;
frag = frag_more (op_length);
where = frag - frag_now->fr_literal;
bfd_putl16 ((bfd_vma) bin, frag);
if (op1.mode == OP_EXP)
{
if (op1.exp.X_op == O_constant)
{
bfd_putl16 (op1.exp.X_add_number & 0xffff, frag + 2);
}
else
{
where += 2;
bfd_putl16 ((bfd_vma) ZEROS, frag + 2);
if (op1.reg || (op1.reg == 0 && op1.am == 3))
fix_new_exp (frag_now, where, 2,
&(op1.exp), FALSE, CHECK_RELOC_MSP430 (op1));
else
fix_new_exp (frag_now, where, 2,
&(op1.exp), TRUE, CHECK_RELOC_MSP430_PCREL);
}
}
dwarf2_emit_insn (insn_length + op_length);
break;
case 4:
/* CALLA instructions. */
fix_emitted = FALSE;
line = extract_operand (line, l1, sizeof (l1));
imm_op = FALSE;
res = msp430_srcoperand (&op1, l1, opcode->bin_opcode, &imm_op,
extended_op, FALSE);
if (res)
break;
byte_op = FALSE;
op_length = 2 + 2 * op1.ol;
frag = frag_more (op_length);
where = frag - frag_now->fr_literal;
if (imm_op)
{
if (op1.am == 3)
{
bin |= 0xb0;
fix_new_exp (frag_now, where, 4, &(op1.exp), FALSE,
BFD_RELOC_MSP430X_ABS20_ADR_DST);
fix_emitted = TRUE;
}
else if (op1.am == 1)
{
if (op1.reg == 0)
{
bin |= 0x90;
fix_new_exp (frag_now, where, 4, &(op1.exp), FALSE,
BFD_RELOC_MSP430X_PCR20_CALL);
fix_emitted = TRUE;
}
else
bin |= 0x50 | op1.reg;
}
else if (op1.am == 0)
bin |= 0x40 | op1.reg;
}
else if (op1.am == 1)
{
bin |= 0x80;
fix_new_exp (frag_now, where, 4, &(op1.exp), FALSE,
BFD_RELOC_MSP430X_ABS20_ADR_DST);
fix_emitted = TRUE;
}
else if (op1.am == 2)
bin |= 0x60 | op1.reg;
else if (op1.am == 3)
bin |= 0x70 | op1.reg;
bfd_putl16 ((bfd_vma) bin, frag);
if (op1.mode == OP_EXP)
{
if (op1.ol != 1)
{
as_bad ("Internal error: unexpected CALLA instruction length: %d\n", op1.ol);
break;
}
bfd_putl16 ((bfd_vma) ZEROS, frag + 2);
if (! fix_emitted)
fix_new_exp (frag_now, where + 2, 2,
&(op1.exp), FALSE, BFD_RELOC_16);
}
dwarf2_emit_insn (insn_length + op_length);
break;
case 5:
{
int n;
int reg;
/* [POP|PUSH]M[.A] #N, Rd */
line = extract_operand (line, l1, sizeof (l1));
line = extract_operand (line, l2, sizeof (l2));
if (*l1 != '#')
{
as_bad (_("expected #n as first argument of %s"), opcode->name);
break;
}
parse_exp (l1 + 1, &(op1.exp));
if (op1.exp.X_op != O_constant)
{
as_bad (_("expected constant expression for first argument of %s"),
opcode->name);
break;
}
if ((reg = check_reg (l2)) == -1)
{
as_bad (_("expected register as second argument of %s"),
opcode->name);
break;
}
op_length = 2;
frag = frag_more (op_length);
where = frag - frag_now->fr_literal;
bin = opcode->bin_opcode;
if (! addr_op)
bin |= 0x100;
n = op1.exp.X_add_number;
bin |= (n - 1) << 4;
if (is_opcode ("pushm"))
bin |= reg;
else
{
if (reg - n + 1 < 0)
{
as_bad (_("Too many registers popped"));
break;
}
/* CPU21 errata: cannot use POPM to restore the SR register. */
if (target_is_430xv2 ()
&& (reg - n + 1 < 3)
&& reg >= 2
&& is_opcode ("popm"))
{
as_bad (_("Cannot use POPM to restore the SR register"));
break;
}
bin |= (reg - n + 1);
}
bfd_putl16 ((bfd_vma) bin, frag);
dwarf2_emit_insn (op_length);
break;
}
case 6:
{
int n;
int reg;
/* Bit rotation instructions. RRCM, RRAM, RRUM, RLAM. */
if (extended & 0xff)
{
as_bad (_("repeat count cannot be used with %s"), opcode->name);
break;
}
line = extract_operand (line, l1, sizeof (l1));
line = extract_operand (line, l2, sizeof (l2));
if (*l1 != '#')
{
as_bad (_("expected #n as first argument of %s"), opcode->name);
break;
}
parse_exp (l1 + 1, &(op1.exp));
if (op1.exp.X_op != O_constant)
{
as_bad (_("expected constant expression for first argument of %s"),
opcode->name);
break;
}
n = op1.exp.X_add_number;
if (n > 4 || n < 1)
{
as_bad (_("expected first argument of %s to be in the range 1-4"),
opcode->name);
break;
}
if ((reg = check_reg (l2)) == -1)
{
as_bad (_("expected register as second argument of %s"),
opcode->name);
break;
}
if (target_is_430xv2 () && reg == 0)
{
as_bad (_("%s: attempt to rotate the PC register"), opcode->name);
break;
}
op_length = 2;
frag = frag_more (op_length);
where = frag - frag_now->fr_literal;
bin = opcode->bin_opcode;
if (! addr_op)
bin |= 0x10;
bin |= (n - 1) << 10;
bin |= reg;
bfd_putl16 ((bfd_vma) bin, frag);
dwarf2_emit_insn (op_length);
break;
}
case 7:
{
int reg;
/* RRUX: Synthetic unsigned right shift of a register by one bit. */
if (extended & 0xff)
{
as_bad (_("repeat count cannot be used with %s"), opcode->name);
break;
}
line = extract_operand (line, l1, sizeof (l1));
if ((reg = check_reg (l1)) == -1)
{
as_bad (_("expected register as argument of %s"),
opcode->name);
break;
}
if (target_is_430xv2 () && reg == 0)
{
as_bad (_("%s: attempt to rotate the PC register"), opcode->name);
break;
}
if (byte_op)
{
/* Tricky - there is no single instruction that will do this.
Encode as: RRA.B rN { BIC.B #0x80, rN */
op_length = 6;
frag = frag_more (op_length);
where = frag - frag_now->fr_literal;
bin = 0x1140 | reg;
bfd_putl16 ((bfd_vma) bin, frag);
dwarf2_emit_insn (2);
bin = 0xc070 | reg;
bfd_putl16 ((bfd_vma) bin, frag + 2);
bin = 0x0080;
bfd_putl16 ((bfd_vma) bin, frag + 4);
dwarf2_emit_insn (4);
}
else
{
/* Encode as RRUM[.A] rN. */
bin = opcode->bin_opcode;
if (! addr_op)
bin |= 0x10;
bin |= reg;
op_length = 2;
frag = frag_more (op_length);
where = frag - frag_now->fr_literal;
bfd_putl16 ((bfd_vma) bin, frag);
dwarf2_emit_insn (op_length);
}
break;
}
case 8:
{
bfd_boolean need_reloc = FALSE;
int n;
int reg;
/* ADDA, CMPA and SUBA address instructions. */
if (extended & 0xff)
{
as_bad (_("repeat count cannot be used with %s"), opcode->name);
break;
}
line = extract_operand (line, l1, sizeof (l1));
line = extract_operand (line, l2, sizeof (l2));
bin = opcode->bin_opcode;
if (*l1 == '#')
{
parse_exp (l1 + 1, &(op1.exp));
if (op1.exp.X_op == O_constant)
{
n = op1.exp.X_add_number;
if (n > 0xfffff || n < - (0x7ffff))
{
as_bad (_("expected value of first argument of %s to fit into 20-bits"),
opcode->name);
break;
}
bin |= ((n >> 16) & 0xf) << 8;
}
else
{
n = 0;
need_reloc = TRUE;
}
op_length = 4;
}
else
{
if ((n = check_reg (l1)) == -1)
{
as_bad (_("expected register name or constant as first argument of %s"),
opcode->name);
break;
}
bin |= (n << 8) | (1 << 6);
op_length = 2;
}
if ((reg = check_reg (l2)) == -1)
{
as_bad (_("expected register as second argument of %s"),
opcode->name);
break;
}
frag = frag_more (op_length);
where = frag - frag_now->fr_literal;
bin |= reg;
if (need_reloc)
fix_new_exp (frag_now, where, 4, &(op1.exp), FALSE,
BFD_RELOC_MSP430X_ABS20_ADR_SRC);
bfd_putl16 ((bfd_vma) bin, frag);
if (op_length == 4)
bfd_putl16 ((bfd_vma) (n & 0xffff), frag + 2);
dwarf2_emit_insn (op_length);
break;
}
case 9: /* MOVA, BRA, RETA. */
imm_op = FALSE;
bin = opcode->bin_opcode;
if (is_opcode ("reta"))
{
/* The RETA instruction does not take any arguments.
The implicit first argument is @SP+.
The implicit second argument is PC. */
op1.mode = OP_REG;
op1.am = 3;
op1.reg = 1;
op2.mode = OP_REG;
op2.reg = 0;
}
else
{
line = extract_operand (line, l1, sizeof (l1));
res = msp430_srcoperand (&op1, l1, opcode->bin_opcode,
&imm_op, extended_op, FALSE);
if (is_opcode ("bra"))
{
/* This is the BRA synthetic instruction.
The second argument is always PC. */
op2.mode = OP_REG;
op2.reg = 0;
}
else
{
line = extract_operand (line, l2, sizeof (l2));
res += msp430_dstoperand (&op2, l2, opcode->bin_opcode,
extended_op, TRUE);
}
if (res)
break; /* Error occurred. All warnings were done before. */
}
/* Only a restricted subset of the normal MSP430 addressing modes
are supported here, so check for the ones that are allowed. */
if ((op_length = try_encode_mova (imm_op, bin, & op1, & op2,
& error_message)) == 0)
{
as_bad (error_message, opcode->name);
break;
}
dwarf2_emit_insn (op_length);
break;
case 10: /* RPT */
line = extract_operand (line, l1, sizeof l1);
/* The RPT instruction only accepted immediates and registers. */
if (*l1 == '#')
{
parse_exp (l1 + 1, &(op1.exp));
if (op1.exp.X_op != O_constant)
{
as_bad (_("expected constant value as argument to RPT"));
break;
}
if (op1.exp.X_add_number < 1
|| op1.exp.X_add_number > (1 << 4))
{
as_bad (_("expected constant in the range 2..16"));
break;
}
/* We silently accept and ignore a repeat count of 1. */
if (op1.exp.X_add_number > 1)
repeat_count = op1.exp.X_add_number;
}
else
{
int reg;
if ((reg = check_reg (l1)) != -1)
{
if (reg == 0)
as_warn (_("PC used as an argument to RPT"));
else
repeat_count = - reg;
}
else
{
as_bad (_("expected constant or register name as argument to RPT insn"));
break;
}
}
break;
default:
as_bad (_("Illegal emulated instruction "));
break;
}
break;
case 1: /* Format 1, double operand. */
line = extract_operand (line, l1, sizeof (l1));
line = extract_operand (line, l2, sizeof (l2));
res = msp430_srcoperand (&op1, l1, opcode->bin_opcode, &imm_op, extended_op, TRUE);
res += msp430_dstoperand (&op2, l2, opcode->bin_opcode, extended_op, TRUE);
if (res)
break; /* Error occurred. All warnings were done before. */
if (extended_op
&& is_opcode ("movx")
&& addr_op
&& msp430_enable_relax)
{
/* This is the MOVX.A instruction. See if we can convert
it into the MOVA instruction instead. This saves 2 bytes. */
if ((op_length = try_encode_mova (imm_op, 0x0000, & op1, & op2,
NULL)) != 0)
{
dwarf2_emit_insn (op_length);
break;
}
}
bin |= (op2.reg | (op1.reg << 8) | (op1.am << 4) | (op2.am << 7));
if ( (is_opcode ("bic") && bin == 0xc232)
|| (is_opcode ("bis") && bin == 0xd232)
|| (is_opcode ("mov") && op2.mode == OP_REG && op2.reg == 2))
{
if (check_for_nop)
{
if (warn_interrupt_nops)
{
if (gen_interrupt_nops)
as_warn (_("NOP inserted between two instructions that change interrupt state"));
else
as_warn (_("a NOP might be needed here because of successive changes in interrupt state"));
}
if (gen_interrupt_nops)
{
/* Emit a NOP between interrupt enable/disable.
See 1.3.4.1 of the MSP430x5xx User Guide. */
insn_length += 2;
frag = frag_more (2);
bfd_putl16 ((bfd_vma) 0x4303 /* NOP */, frag);
}
}
nop_check_needed = TRUE;
}
/* Compute the entire length of the instruction in bytes. */
op_length = (extended_op ? 2 : 0) /* The extension word. */
+ 2 /* The opcode */
+ (2 * op1.ol) /* The first operand. */
+ (2 * op2.ol); /* The second operand. */
insn_length += op_length;
frag = frag_more (op_length);
where = frag - frag_now->fr_literal;
if (extended_op)
{
if (!addr_op)
extended |= BYTE_OPERATION;
if ((op1.ol != 0 || op2.ol != 0) && ((extended & 0xf) != 0))
{
as_bad (_("repeat instruction used with non-register mode instruction"));
extended &= ~ 0xf;
}
/* If necessary, emit a reloc to update the extension word. */
if (op1.mode == OP_EXP)
{
if (op1.exp.X_op == O_constant)
extended |= ((op1.exp.X_add_number >> 16) & 0xf) << 7;
else if (op1.reg || (op1.reg == 0 && op1.am == 3)) /* Not PC relative. */
fix_new_exp (frag_now, where, 6, &(op1.exp), FALSE,
BFD_RELOC_MSP430X_ABS20_EXT_SRC);
else
fix_new_exp (frag_now, where, 6, &(op1.exp), FALSE,
BFD_RELOC_MSP430X_PCR20_EXT_SRC);
}
if (op2.mode == OP_EXP)
{
if (op2.exp.X_op == O_constant)
extended |= (op2.exp.X_add_number >> 16) & 0xf;
else if (op1.mode == OP_EXP)
fix_new_exp (frag_now, where, 8, &(op2.exp), FALSE,
op2.reg ? BFD_RELOC_MSP430X_ABS20_EXT_ODST
: BFD_RELOC_MSP430X_PCR20_EXT_ODST);
else
fix_new_exp (frag_now, where, 6, &(op2.exp), FALSE,
op2.reg ? BFD_RELOC_MSP430X_ABS20_EXT_DST
: BFD_RELOC_MSP430X_PCR20_EXT_DST);
}
/* Emit the extension word. */
bfd_putl16 (extended, frag);
where += 2;
frag += 2;
}
bfd_putl16 ((bfd_vma) bin, frag);
where += 2;
frag += 2;
if (op1.mode == OP_EXP)
{
if (op1.exp.X_op == O_constant)
{
bfd_putl16 (op1.exp.X_add_number & 0xffff, frag);
}
else
{
bfd_putl16 ((bfd_vma) ZEROS, frag);
if (!extended_op)
{
if (op1.reg || (op1.reg == 0 && op1.am == 3)) /* Not PC relative. */
fix_new_exp (frag_now, where, 2,
&(op1.exp), FALSE, CHECK_RELOC_MSP430 (op1));
else
fix_new_exp (frag_now, where, 2,
&(op1.exp), TRUE, CHECK_RELOC_MSP430_PCREL);
}
}
where += 2;
frag += 2;
}
if (op2.mode == OP_EXP)
{
if (op2.exp.X_op == O_constant)
{
bfd_putl16 (op2.exp.X_add_number & 0xffff, frag);
}
else
{
bfd_putl16 ((bfd_vma) ZEROS, frag);
if (!extended_op)
{
if (op2.reg) /* Not PC relative. */
fix_new_exp (frag_now, where, 2,
&(op2.exp), FALSE, CHECK_RELOC_MSP430 (op2));
else
fix_new_exp (frag_now, where, 2,
&(op2.exp), TRUE, CHECK_RELOC_MSP430_PCREL);
}
}
}
dwarf2_emit_insn (insn_length);
break;
case 2: /* Single-operand mostly instr. */
if (opcode->insn_opnumb == 0)
{
/* reti instruction. */
insn_length += 2;
frag = frag_more (2);
bfd_putl16 ((bfd_vma) bin, frag);
dwarf2_emit_insn (insn_length);
break;
}
line = extract_operand (line, l1, sizeof (l1));
res = msp430_srcoperand (&op1, l1, opcode->bin_opcode,
&imm_op, extended_op, TRUE);
if (res)
break; /* Error in operand. */
if (target_is_430xv2 ()
&& op1.mode == OP_REG
&& op1.reg == 0
&& (is_opcode ("rrax")
|| is_opcode ("rrcx")
|| is_opcode ("rra")
|| is_opcode ("rrc")))
{
as_bad (_("%s: attempt to rotate the PC register"), opcode->name);
break;
}
insn_length = (extended_op ? 2 : 0) + 2 + (op1.ol * 2);
frag = frag_more (insn_length);
where = frag - frag_now->fr_literal;
if (extended_op)
{
if (is_opcode ("swpbx") || is_opcode ("sxtx"))
{
/* These two instructions use a special
encoding of the A/L and B/W bits. */
bin &= ~ BYTE_OPERATION;
if (byte_op)
{
as_bad (_("%s instruction does not accept a .b suffix"),
opcode->name);
break;
}
else if (! addr_op)
extended |= BYTE_OPERATION;
}
else if (! addr_op)
extended |= BYTE_OPERATION;
if (op1.ol != 0 && ((extended & 0xf) != 0))
{
as_bad (_("repeat instruction used with non-register mode instruction"));
extended &= ~ 0xf;
}
if (op1.mode == OP_EXP)
{
if (op1.exp.X_op == O_constant)
extended |= ((op1.exp.X_add_number >> 16) & 0xf) << 7;
else if (op1.reg || (op1.reg == 0 && op1.am == 3)) /* Not PC relative. */
fix_new_exp (frag_now, where, 6, &(op1.exp), FALSE,
BFD_RELOC_MSP430X_ABS20_EXT_SRC);
else
fix_new_exp (frag_now, where, 6, &(op1.exp), FALSE,
BFD_RELOC_MSP430X_PCR20_EXT_SRC);
}
/* Emit the extension word. */
bfd_putl16 (extended, frag);
frag += 2;
where += 2;
}
bin |= op1.reg | (op1.am << 4);
bfd_putl16 ((bfd_vma) bin, frag);
frag += 2;
where += 2;
if (op1.mode == OP_EXP)
{
if (op1.exp.X_op == O_constant)
{
bfd_putl16 (op1.exp.X_add_number & 0xffff, frag);
}
else
{
bfd_putl16 ((bfd_vma) ZEROS, frag);
if (!extended_op)
{
if (op1.reg || (op1.reg == 0 && op1.am == 3)) /* Not PC relative. */
fix_new_exp (frag_now, where, 2,
&(op1.exp), FALSE, CHECK_RELOC_MSP430 (op1));
else
fix_new_exp (frag_now, where, 2,
&(op1.exp), TRUE, CHECK_RELOC_MSP430_PCREL);
}
}
}
dwarf2_emit_insn (insn_length);
break;
case 3: /* Conditional jumps instructions. */
line = extract_operand (line, l1, sizeof (l1));
/* l1 is a label. */
if (l1[0])
{
char *m = l1;
expressionS exp;
if (*m == '$')
m++;
parse_exp (m, &exp);
/* In order to handle something like:
and #0x8000, r5
tst r5
jz 4 ; skip next 4 bytes
inv r5
inc r5
nop ; will jump here if r5 positive or zero
jCOND -n ;assumes jump n bytes backward:
mov r5,r6
jmp -2
is equal to:
lab:
mov r5,r6
jmp lab
jCOND $n ; jump from PC in either direction. */
if (exp.X_op == O_constant)
{
int x = exp.X_add_number;
if (x & 1)
{
as_warn (_("Even number required. Rounded to %d"), x + 1);
x++;
}
if ((*l1 == '$' && x > 0) || x < 0)
x -= 2;
x >>= 1;
if (x > 512 || x < -511)
{
as_bad (_("Wrong displacement %d"), x << 1);
break;
}
insn_length += 2;
frag = frag_more (2); /* Instr size is 1 word. */
bin |= x & 0x3ff;
bfd_putl16 ((bfd_vma) bin, frag);
}
else if (exp.X_op == O_symbol && *l1 != '$')
{
insn_length += 2;
frag = frag_more (2); /* Instr size is 1 word. */
where = frag - frag_now->fr_literal;
fix_new_exp (frag_now, where, 2,
&exp, TRUE, BFD_RELOC_MSP430_10_PCREL);
bfd_putl16 ((bfd_vma) bin, frag);
}
else if (*l1 == '$')
{
as_bad (_("instruction requires label sans '$'"));
}
else
as_bad (_
("instruction requires label or value in range -511:512"));
dwarf2_emit_insn (insn_length);
break;
}
else
{
as_bad (_("instruction requires label"));
break;
}
break;
case 4: /* Extended jumps. */
if (!msp430_enable_polys)
{
as_bad (_("polymorphs are not enabled. Use -mP option to enable."));
break;
}
line = extract_operand (line, l1, sizeof (l1));
if (l1[0])
{
char *m = l1;
expressionS exp;
/* Ignore absolute addressing. make it PC relative anyway. */
if (*m == '#' || *m == '$')
m++;
parse_exp (m, & exp);
if (exp.X_op == O_symbol)
{
/* Relaxation required. */
struct rcodes_s rc = msp430_rcodes[opcode->insn_opnumb];
if (target_is_430x ())
rc = msp430x_rcodes[opcode->insn_opnumb];
/* The parameter to dwarf2_emit_insn is actually the offset to
the start of the insn from the fix piece of instruction that
was emitted. Since next fragments may have variable size we
tie debug info to the beginning of the instruction. */
insn_length += 8;
frag = frag_more (8);
dwarf2_emit_insn (0);
bfd_putl16 ((bfd_vma) rc.sop, frag);
frag = frag_variant (rs_machine_dependent, 8, 2,
/* Wild guess. */
ENCODE_RELAX (rc.lpos, STATE_BITS10),
exp.X_add_symbol,
0, /* Offset is zero if jump dist less than 1K. */
(char *) frag);
break;
}
}
as_bad (_("instruction requires label"));
break;
case 5: /* Emulated extended branches. */
if (!msp430_enable_polys)
{
as_bad (_("polymorphs are not enabled. Use -mP option to enable."));
break;
}
line = extract_operand (line, l1, sizeof (l1));
if (l1[0])
{
char * m = l1;
expressionS exp;
/* Ignore absolute addressing. make it PC relative anyway. */
if (*m == '#' || *m == '$')
m++;
parse_exp (m, & exp);
if (exp.X_op == O_symbol)
{
/* Relaxation required. */
struct hcodes_s hc = msp430_hcodes[opcode->insn_opnumb];
if (target_is_430x ())
hc = msp430x_hcodes[opcode->insn_opnumb];
insn_length += 8;
frag = frag_more (8);
dwarf2_emit_insn (0);
bfd_putl16 ((bfd_vma) hc.op0, frag);
bfd_putl16 ((bfd_vma) hc.op1, frag+2);
frag = frag_variant (rs_machine_dependent, 8, 2,
ENCODE_RELAX (STATE_EMUL_BRANCH, STATE_BITS10), /* Wild guess. */
exp.X_add_symbol,
0, /* Offset is zero if jump dist less than 1K. */
(char *) frag);
break;
}
}
as_bad (_("instruction requires label"));
break;
default:
as_bad (_("Illegal instruction or not implemented opcode."));
}
input_line_pointer = line;
check_for_nop = nop_check_needed;
return 0;
}
void
md_assemble (char * str)
{
struct msp430_opcode_s * opcode;
char cmd[32];
unsigned int i = 0;
str = skip_space (str); /* Skip leading spaces. */
str = extract_cmd (str, cmd, sizeof (cmd));
while (cmd[i] && i < sizeof (cmd))
{
char a = TOLOWER (cmd[i]);
cmd[i] = a;
i++;
}
if (!cmd[0])
{
as_bad (_("can't find opcode "));
return;
}
opcode = (struct msp430_opcode_s *) hash_find (msp430_hash, cmd);
if (opcode == NULL)
{
as_bad (_("unknown opcode `%s'"), cmd);
return;
}
{
char *__t = input_line_pointer;
msp430_operands (opcode, str);
input_line_pointer = __t;
}
}
/* GAS will call this function for each section at the end of the assembly,
to permit the CPU backend to adjust the alignment of a section. */
valueT
md_section_align (asection * seg, valueT addr)
{
int align = bfd_get_section_alignment (stdoutput, seg);
return ((addr + (1 << align) - 1) & (-1 << align));
}
/* If you define this macro, it should return the offset between the
address of a PC relative fixup and the position from which the PC
relative adjustment should be made. On many processors, the base
of a PC relative instruction is the next instruction, so this
macro would return the length of an instruction. */
long
md_pcrel_from_section (fixS * fixp, segT sec)
{
if (fixp->fx_addsy != (symbolS *) NULL
&& (!S_IS_DEFINED (fixp->fx_addsy)
|| (S_GET_SEGMENT (fixp->fx_addsy) != sec)))
return 0;
return fixp->fx_frag->fr_address + fixp->fx_where;
}
/* Replaces standard TC_FORCE_RELOCATION_LOCAL.
Now it handles the situation when relocations
have to be passed to linker. */
int
msp430_force_relocation_local (fixS *fixp)
{
if (fixp->fx_r_type == BFD_RELOC_MSP430_10_PCREL)
return 1;
if (fixp->fx_pcrel)
return 1;
if (msp430_enable_polys
&& !msp430_enable_relax)
return 1;
return (!fixp->fx_pcrel
|| generic_force_reloc (fixp));
}
/* GAS will call this for each fixup. It should store the correct
value in the object file. */
void
md_apply_fix (fixS * fixp, valueT * valuep, segT seg)
{
unsigned char * where;
unsigned long insn;
long value;
if (fixp->fx_addsy == (symbolS *) NULL)
{
value = *valuep;
fixp->fx_done = 1;
}
else if (fixp->fx_pcrel)
{
segT s = S_GET_SEGMENT (fixp->fx_addsy);
if (fixp->fx_addsy && (s == seg || s == absolute_section))
{
/* FIXME: We can appear here only in case if we perform a pc
relative jump to the label which is i) global, ii) locally
defined or this is a jump to an absolute symbol.
If this is an absolute symbol -- everything is OK.
If this is a global label, we've got a symbol value defined
twice:
1. S_GET_VALUE (fixp->fx_addsy) will contain a symbol offset
from this section start
2. *valuep will contain the real offset from jump insn to the
label
So, the result of S_GET_VALUE (fixp->fx_addsy) + (* valuep);
will be incorrect. Therefore remove s_get_value. */
value = /* S_GET_VALUE (fixp->fx_addsy) + */ * valuep;
fixp->fx_done = 1;
}
else
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);
fixp->fx_done = 1;
}
}
}
fixp->fx_no_overflow = 1;
/* If polymorphs are enabled and relax disabled.
do not kill any relocs and pass them to linker. */
if (msp430_enable_polys
&& !msp430_enable_relax)
{
if (!fixp->fx_addsy || (fixp->fx_addsy
&& S_GET_SEGMENT (fixp->fx_addsy) == absolute_section))
fixp->fx_done = 1; /* It is ok to kill 'abs' reloc. */
else
fixp->fx_done = 0;
}
if (fixp->fx_done)
{
/* Fetch the instruction, insert the fully resolved operand
value, and stuff the instruction back again. */
where = (unsigned char *) fixp->fx_frag->fr_literal + fixp->fx_where;
insn = bfd_getl16 (where);
switch (fixp->fx_r_type)
{
case BFD_RELOC_MSP430_10_PCREL:
if (value & 1)
as_bad_where (fixp->fx_file, fixp->fx_line,
_("odd address operand: %ld"), value);
/* Jumps are in words. */
value >>= 1;
--value; /* Correct PC. */
if (value < -512 || value > 511)
as_bad_where (fixp->fx_file, fixp->fx_line,
_("operand out of range: %ld"), value);
value &= 0x3ff; /* get rid of extended sign */
bfd_putl16 ((bfd_vma) (value | insn), where);
break;
case BFD_RELOC_MSP430X_PCR16:
case BFD_RELOC_MSP430_RL_PCREL:
case BFD_RELOC_MSP430_16_PCREL:
if (value & 1)
as_bad_where (fixp->fx_file, fixp->fx_line,
_("odd address operand: %ld"), value);
/* Fall through. */
case BFD_RELOC_MSP430_16_PCREL_BYTE:
/* Nothing to be corrected here. */
if (value < -32768 || value > 65536)
as_bad_where (fixp->fx_file, fixp->fx_line,
_("operand out of range: %ld"), value);
/* Fall through. */
case BFD_RELOC_MSP430X_ABS16:
case BFD_RELOC_MSP430_16:
case BFD_RELOC_16:
case BFD_RELOC_MSP430_16_BYTE:
value &= 0xffff; /* Get rid of extended sign. */
bfd_putl16 ((bfd_vma) value, where);
break;
case BFD_RELOC_MSP430_ABS_HI16:
value >>= 16;
value &= 0xffff; /* Get rid of extended sign. */
bfd_putl16 ((bfd_vma) value, where);
break;
case BFD_RELOC_32:
bfd_putl16 ((bfd_vma) value, where);
break;
case BFD_RELOC_MSP430_ABS8:
case BFD_RELOC_8:
bfd_put_8 (NULL, (bfd_vma) value, where);
break;
case BFD_RELOC_MSP430X_ABS20_EXT_SRC:
case BFD_RELOC_MSP430X_PCR20_EXT_SRC:
bfd_putl16 ((bfd_vma) (value & 0xffff), where + 4);
value >>= 16;
bfd_putl16 ((bfd_vma) (((value & 0xf) << 7) | insn), where);
break;
case BFD_RELOC_MSP430X_ABS20_ADR_SRC:
bfd_putl16 ((bfd_vma) (value & 0xffff), where + 2);
value >>= 16;
bfd_putl16 ((bfd_vma) (((value & 0xf) << 8) | insn), where);
break;
case BFD_RELOC_MSP430X_ABS20_EXT_ODST:
bfd_putl16 ((bfd_vma) (value & 0xffff), where + 6);
value >>= 16;
bfd_putl16 ((bfd_vma) ((value & 0xf) | insn), where);
break;
case BFD_RELOC_MSP430X_PCR20_CALL:
bfd_putl16 ((bfd_vma) (value & 0xffff), where + 2);
value >>= 16;
bfd_putl16 ((bfd_vma) ((value & 0xf) | insn), where);
break;
case BFD_RELOC_MSP430X_ABS20_EXT_DST:
case BFD_RELOC_MSP430X_PCR20_EXT_DST:
bfd_putl16 ((bfd_vma) (value & 0xffff), where + 4);
value >>= 16;
bfd_putl16 ((bfd_vma) ((value & 0xf) | insn), where);
break;
case BFD_RELOC_MSP430X_PCR20_EXT_ODST:
bfd_putl16 ((bfd_vma) (value & 0xffff), where + 6);
value >>= 16;
bfd_putl16 ((bfd_vma) ((value & 0xf) | insn), where);
break;
case BFD_RELOC_MSP430X_ABS20_ADR_DST:
bfd_putl16 ((bfd_vma) (value & 0xffff), where + 2);
value >>= 16;
bfd_putl16 ((bfd_vma) ((value & 0xf) | insn), where);
break;
default:
as_fatal (_("line %d: unknown relocation type: 0x%x"),
fixp->fx_line, fixp->fx_r_type);
break;
}
}
else
{
fixp->fx_addnumber = value;
}
}
static bfd_boolean
S_IS_GAS_LOCAL (symbolS * s)
{
const char * name;
unsigned int len;
if (s == NULL)
return FALSE;
name = S_GET_NAME (s);
len = strlen (name) - 1;
return name[len] == 1 || name[len] == 2;
}
/* GAS will call this to generate a reloc, passing the resulting reloc
to `bfd_install_relocation'. This currently works poorly, as
`bfd_install_relocation' often does the wrong thing, and instances of
`tc_gen_reloc' have been written to work around the problems, which
in turns makes it difficult to fix `bfd_install_relocation'. */
/* If while processing a fixup, a reloc really needs to be created
then it is done here. */
arelent **
tc_gen_reloc (asection * seg ATTRIBUTE_UNUSED, fixS * fixp)
{
static arelent * no_relocs = NULL;
static arelent * relocs[MAX_RELOC_EXPANSION + 1];
arelent *reloc;
reloc = xmalloc (sizeof (arelent));
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,
_("reloc %d not supported by object file format"),
(int) fixp->fx_r_type);
free (reloc);
return & no_relocs;
}
relocs[0] = reloc;
relocs[1] = NULL;
if (fixp->fx_subsy
&& S_GET_SEGMENT (fixp->fx_subsy) == absolute_section)
{
fixp->fx_offset -= S_GET_VALUE (fixp->fx_subsy);
fixp->fx_subsy = NULL;
}
if (fixp->fx_addsy && fixp->fx_subsy)
{
asection *asec, *ssec;
asec = S_GET_SEGMENT (fixp->fx_addsy);
ssec = S_GET_SEGMENT (fixp->fx_subsy);
/* If we have a difference between two different, non-absolute symbols
we must generate two relocs (one for each symbol) and allow the
linker to resolve them - relaxation may change the distances between
symbols, even local symbols defined in the same section.
Unfortunately we cannot do this with assembler generated local labels
because there can be multiple incarnations of the same label, with
exactly the same name, in any given section and the linker will have
no way to identify the correct one. Instead we just have to hope
that no relaxtion will occur between the local label and the other
symbol in the expression.
Similarly we have to compute differences between symbols in the .eh_frame
section as the linker is not smart enough to apply relocations there
before attempting to process it. */
if ((ssec != absolute_section || asec != absolute_section)
&& (fixp->fx_addsy != fixp->fx_subsy)
&& strcmp (ssec->name, ".eh_frame") != 0
&& ! S_IS_GAS_LOCAL (fixp->fx_addsy)
&& ! S_IS_GAS_LOCAL (fixp->fx_subsy))
{
arelent * reloc2 = xmalloc (sizeof * reloc);
relocs[0] = reloc2;
relocs[1] = reloc;
reloc2->address = reloc->address;
reloc2->howto = bfd_reloc_type_lookup (stdoutput,
BFD_RELOC_MSP430_SYM_DIFF);
reloc2->addend = - S_GET_VALUE (fixp->fx_subsy);
if (ssec == absolute_section)
reloc2->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
else
{
reloc2->sym_ptr_ptr = xmalloc (sizeof (asymbol *));
*reloc2->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_subsy);
}
reloc->addend = fixp->fx_offset;
if (asec == absolute_section)
{
reloc->addend += S_GET_VALUE (fixp->fx_addsy);
reloc->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
}
else
{
reloc->sym_ptr_ptr = xmalloc (sizeof (asymbol *));
*reloc->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy);
}
fixp->fx_pcrel = 0;
fixp->fx_done = 1;
return relocs;
}
else
{
char *fixpos = fixp->fx_where + fixp->fx_frag->fr_literal;
reloc->addend = (S_GET_VALUE (fixp->fx_addsy)
- S_GET_VALUE (fixp->fx_subsy) + fixp->fx_offset);
switch (fixp->fx_r_type)
{
case BFD_RELOC_8:
md_number_to_chars (fixpos, reloc->addend, 1);
break;
case BFD_RELOC_16:
md_number_to_chars (fixpos, reloc->addend, 2);
break;
case BFD_RELOC_24:
md_number_to_chars (fixpos, reloc->addend, 3);
break;
case BFD_RELOC_32:
md_number_to_chars (fixpos, reloc->addend, 4);
break;
default:
reloc->sym_ptr_ptr
= (asymbol **) bfd_abs_section_ptr->symbol_ptr_ptr;
return relocs;
}
free (reloc);
return & no_relocs;
}
}
else
{
#if 0
if (fixp->fx_r_type == BFD_RELOC_MSP430X_ABS16
&& S_GET_SEGMENT (fixp->fx_addsy) == absolute_section)
{
bfd_vma amount = S_GET_VALUE (fixp->fx_addsy);
char *fixpos = fixp->fx_where + fixp->fx_frag->fr_literal;
md_number_to_chars (fixpos, amount, 2);
free (reloc);
return & no_relocs;
}
#endif
reloc->sym_ptr_ptr = xmalloc (sizeof (asymbol *));
*reloc->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy);
reloc->addend = fixp->fx_offset;
if (fixp->fx_r_type == BFD_RELOC_VTABLE_INHERIT
|| fixp->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
reloc->address = fixp->fx_offset;
}
return relocs;
}
int
md_estimate_size_before_relax (fragS * fragP ATTRIBUTE_UNUSED,
asection * segment_type ATTRIBUTE_UNUSED)
{
if (fragP->fr_symbol && S_GET_SEGMENT (fragP->fr_symbol) == segment_type)
{
/* This is a jump -> pcrel mode. Nothing to do much here.
Return value == 2. */
fragP->fr_subtype =
ENCODE_RELAX (RELAX_LEN (fragP->fr_subtype), STATE_BITS10);
}
else if (fragP->fr_symbol)
{
/* Its got a segment, but its not ours. Even if fr_symbol is in
an absolute segment, we don't know a displacement until we link
object files. So it will always be long. This also applies to
labels in a subsegment of current. Liker may relax it to short
jump later. Return value == 8. */
fragP->fr_subtype =
ENCODE_RELAX (RELAX_LEN (fragP->fr_subtype), STATE_WORD);
}
else
{
/* We know the abs value. may be it is a jump to fixed address.
Impossible in our case, cause all constants already handled. */
fragP->fr_subtype =
ENCODE_RELAX (RELAX_LEN (fragP->fr_subtype), STATE_UNDEF);
}
return md_relax_table[fragP->fr_subtype].rlx_length;
}
void
md_convert_frag (bfd * abfd ATTRIBUTE_UNUSED,
asection * sec ATTRIBUTE_UNUSED,
fragS * fragP)
{
char * where = 0;
int rela = -1;
int i;
struct rcodes_s * cc = NULL;
struct hcodes_s * hc = NULL;
switch (fragP->fr_subtype)
{
case ENCODE_RELAX (STATE_UNCOND_BRANCH, STATE_BITS10):
case ENCODE_RELAX (STATE_SIMPLE_BRANCH, STATE_BITS10):
case ENCODE_RELAX (STATE_NOOV_BRANCH, STATE_BITS10):
/* We do not have to convert anything here.
Just apply a fix. */
rela = BFD_RELOC_MSP430_10_PCREL;
break;
case ENCODE_RELAX (STATE_UNCOND_BRANCH, STATE_WORD):
case ENCODE_RELAX (STATE_UNCOND_BRANCH, STATE_UNDEF):
/* Convert uncond branch jmp lab -> br lab. */
if (target_is_430x ())
cc = msp430x_rcodes + 7;
else
cc = msp430_rcodes + 7;
where = fragP->fr_literal + fragP->fr_fix;
bfd_putl16 (cc->lop0, where);
rela = BFD_RELOC_MSP430_RL_PCREL;
fragP->fr_fix += 2;
break;
case ENCODE_RELAX (STATE_SIMPLE_BRANCH, STATE_WORD):
case ENCODE_RELAX (STATE_SIMPLE_BRANCH, STATE_UNDEF):
{
/* Other simple branches. */
int insn = bfd_getl16 (fragP->fr_opcode);
insn &= 0xffff;
/* Find actual instruction. */
if (target_is_430x ())
{
for (i = 0; i < 7 && !cc; i++)
if (msp430x_rcodes[i].sop == insn)
cc = msp430x_rcodes + i;
}
else
{
for (i = 0; i < 7 && !cc; i++)
if (msp430_rcodes[i].sop == insn)
cc = & msp430_rcodes[i];
}
if (!cc || !cc->name)
as_fatal (_("internal inconsistency problem in %s: insn %04lx"),
__FUNCTION__, (long) insn);
where = fragP->fr_literal + fragP->fr_fix;
bfd_putl16 (cc->lop0, where);
bfd_putl16 (cc->lop1, where + 2);
rela = BFD_RELOC_MSP430_RL_PCREL;
fragP->fr_fix += 4;
}
break;
case ENCODE_RELAX (STATE_NOOV_BRANCH, STATE_WORD):
case ENCODE_RELAX (STATE_NOOV_BRANCH, STATE_UNDEF):
if (target_is_430x ())
cc = msp430x_rcodes + 6;
else
cc = msp430_rcodes + 6;
where = fragP->fr_literal + fragP->fr_fix;
bfd_putl16 (cc->lop0, where);
bfd_putl16 (cc->lop1, where + 2);
bfd_putl16 (cc->lop2, where + 4);
rela = BFD_RELOC_MSP430_RL_PCREL;
fragP->fr_fix += 6;
break;
case ENCODE_RELAX (STATE_EMUL_BRANCH, STATE_BITS10):
{
int insn = bfd_getl16 (fragP->fr_opcode + 2);
insn &= 0xffff;
if (target_is_430x ())
{
for (i = 0; i < 4 && !hc; i++)
if (msp430x_hcodes[i].op1 == insn)
hc = msp430x_hcodes + i;
}
else
{
for (i = 0; i < 4 && !hc; i++)
if (msp430_hcodes[i].op1 == insn)
hc = &msp430_hcodes[i];
}
if (!hc || !hc->name)
as_fatal (_("internal inconsistency problem in %s: ext. insn %04lx"),
__FUNCTION__, (long) insn);
rela = BFD_RELOC_MSP430_10_PCREL;
/* Apply a fix for a first label if necessary.
another fix will be applied to the next word of insn anyway. */
if (hc->tlab == 2)
fix_new (fragP, fragP->fr_fix, 2, fragP->fr_symbol,
fragP->fr_offset, TRUE, rela);
fragP->fr_fix += 2;
}
break;
case ENCODE_RELAX (STATE_EMUL_BRANCH, STATE_WORD):
case ENCODE_RELAX (STATE_EMUL_BRANCH, STATE_UNDEF):
{
int insn = bfd_getl16 (fragP->fr_opcode + 2);
insn &= 0xffff;
if (target_is_430x ())
{
for (i = 0; i < 4 && !hc; i++)
if (msp430x_hcodes[i].op1 == insn)
hc = msp430x_hcodes + i;
}
else
{
for (i = 0; i < 4 && !hc; i++)
if (msp430_hcodes[i].op1 == insn)
hc = & msp430_hcodes[i];
}
if (!hc || !hc->name)
as_fatal (_("internal inconsistency problem in %s: ext. insn %04lx"),
__FUNCTION__, (long) insn);
rela = BFD_RELOC_MSP430_RL_PCREL;
where = fragP->fr_literal + fragP->fr_fix;
bfd_putl16 (hc->lop0, where);
bfd_putl16 (hc->lop1, where + 2);
bfd_putl16 (hc->lop2, where + 4);
fragP->fr_fix += 6;
}
break;
default:
as_fatal (_("internal inconsistency problem in %s: %lx"),
__FUNCTION__, (long) fragP->fr_subtype);
break;
}
/* Now apply fix. */
fix_new (fragP, fragP->fr_fix, 2, fragP->fr_symbol,
fragP->fr_offset, TRUE, rela);
/* Just fixed 2 bytes. */
fragP->fr_fix += 2;
}
/* Relax fragment. Mostly stolen from hc11 and mcore
which arches I think I know. */
long
msp430_relax_frag (segT seg ATTRIBUTE_UNUSED, fragS * fragP,
long stretch ATTRIBUTE_UNUSED)
{
long growth;
offsetT aim = 0;
symbolS *symbolP;
const relax_typeS *this_type;
const relax_typeS *start_type;
relax_substateT next_state;
relax_substateT this_state;
const relax_typeS *table = md_relax_table;
/* Nothing to be done if the frag has already max size. */
if (RELAX_STATE (fragP->fr_subtype) == STATE_UNDEF
|| RELAX_STATE (fragP->fr_subtype) == STATE_WORD)
return 0;
if (RELAX_STATE (fragP->fr_subtype) == STATE_BITS10)
{
symbolP = fragP->fr_symbol;
if (symbol_resolved_p (symbolP))
as_fatal (_("internal inconsistency problem in %s: resolved symbol"),
__FUNCTION__);
/* We know the offset. calculate a distance. */
aim = S_GET_VALUE (symbolP) - fragP->fr_address - fragP->fr_fix;
}
if (!msp430_enable_relax)
{
/* Relaxation is not enabled. So, make all jump as long ones
by setting 'aim' to quite high value. */
aim = 0x7fff;
}
this_state = fragP->fr_subtype;
start_type = this_type = table + this_state;
if (aim < 0)
{
/* Look backwards. */
for (next_state = this_type->rlx_more; next_state;)
if (aim >= this_type->rlx_backward || !this_type->rlx_backward)
next_state = 0;
else
{
/* Grow to next state. */
this_state = next_state;
this_type = table + this_state;
next_state = this_type->rlx_more;
}
}
else
{
/* Look forwards. */
for (next_state = this_type->rlx_more; next_state;)
if (aim <= this_type->rlx_forward || !this_type->rlx_forward)
next_state = 0;
else
{
/* Grow to next state. */
this_state = next_state;
this_type = table + this_state;
next_state = this_type->rlx_more;
}
}
growth = this_type->rlx_length - start_type->rlx_length;
if (growth != 0)
fragP->fr_subtype = this_state;
return growth;
}
/* Return FALSE if the fixup in fixp should be left alone and not
adjusted. We return FALSE here so that linker relaxation will
work. */
bfd_boolean
msp430_fix_adjustable (struct fix *fixp ATTRIBUTE_UNUSED)
{
/* If the symbol is in a non-code section then it should be OK. */
if (fixp->fx_addsy
&& ((S_GET_SEGMENT (fixp->fx_addsy)->flags & SEC_CODE) == 0))
return TRUE;
return FALSE;
}
/* Set the contents of the .MSP430.attributes section. */
void
msp430_md_end (void)
{
if (check_for_nop == TRUE && warn_interrupt_nops)
as_warn ("assembly finished with the last instruction changing interrupt state - a NOP might be needed");
bfd_elf_add_proc_attr_int (stdoutput, OFBA_MSPABI_Tag_ISA,
target_is_430x () ? 2 : 1);
bfd_elf_add_proc_attr_int (stdoutput, OFBA_MSPABI_Tag_Code_Model,
large_model ? 2 : 1);
bfd_elf_add_proc_attr_int (stdoutput, OFBA_MSPABI_Tag_Data_Model,
large_model ? 2 : 1);
}
/* Returns FALSE if there is a msp430 specific reason why the
subtraction of two same-section symbols cannot be computed by
the assembler. */
bfd_boolean
msp430_allow_local_subtract (expressionS * left,
expressionS * right,
segT section)
{
/* If the symbols are not in a code section then they are OK. */
if ((section->flags & SEC_CODE) == 0)
return TRUE;
if (S_IS_GAS_LOCAL (left->X_add_symbol) || S_IS_GAS_LOCAL (right->X_add_symbol))
return TRUE;
if (left->X_add_symbol == right->X_add_symbol)
return TRUE;
/* We have to assume that there may be instructions between the
two symbols and that relaxation may increase the distance between
them. */
return FALSE;
}
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