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/* tc-msp430.c -- Assembler code for the Texas Instruments MSP430
Copyright (C) 2002-2021 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>
#include "subsegs.h"
#include "opcode/msp430.h"
#include "safe-ctype.h"
#include "dwarf2dbg.h"
#include "elf/msp430.h"
#include "libiberty.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;
/* 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
{
const 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
{
const 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 htab_t 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 4096
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 bool
target_is_430x (void)
{
return selected_isa >= MSP_ISA_430X;
}
static inline bool
target_is_430xv2 (void)
{
return selected_isa == MSP_ISA_430Xv2;
}
/* Generate an absolute 16-bit relocation, for 430 (!extended_op) instructions
only.
For the 430X we generate a 430 relocation only for the case where part of an
expression is being extracted (e.g. #hi(EXP), #lo(EXP). Otherwise generate
a 430X relocation.
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 () \
? ((OP).expp == MSP_EXPP_ALL \
? BFD_RELOC_MSP430X_ABS16 \
: ((OP).vshift == 1 \
? BFD_RELOC_MSP430_ABS_HI16 : BFD_RELOC_16)) \
: ((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 linker 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"));
/* Our caller is likely to check that the entire expression was parsed.
If we have found a hex constant with an 'h' suffix, ilp will be left
pointing at the 'h', so skip it here. */
if (input_line_pointer != NULL
&& op->X_op == O_constant
&& (*input_line_pointer == 'h' || *input_line_pointer == 'H'))
++ input_line_pointer;
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. */
(void) 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 bool large_model = false;
#define OPTION_NO_INTR_NOPS 'N'
#define OPTION_INTR_NOPS 'n'
static bool gen_interrupt_nops = false;
#define OPTION_WARN_INTR_NOPS 'y'
#define OPTION_NO_WARN_INTR_NOPS 'Y'
static bool warn_interrupt_nops = true;
#define OPTION_UNKNOWN_INTR_NOPS 'u'
#define OPTION_NO_UNKNOWN_INTR_NOPS 'U'
static bool do_unknown_interrupt_nops = true;
#define OPTION_MCPU 'c'
#define OPTION_DATA_REGION 'r'
static bool upper_data_region_in_use = false;
/* The default is to use the lower region only. */
static bool lower_data_region_only = true;
/* Deprecated option, silently ignore it for compatibility with GCC <= 10. */
#define OPTION_MOVE_DATA 'd'
enum
{
OPTION_SILICON_ERRATA = OPTION_MD_BASE,
OPTION_SILICON_ERRATA_WARN,
};
static unsigned int silicon_errata_fix = 0;
static unsigned int silicon_errata_warn = 0;
#define SILICON_ERRATA_CPU4 (1 << 0)
#define SILICON_ERRATA_CPU8 (1 << 1)
#define SILICON_ERRATA_CPU11 (1 << 2)
#define SILICON_ERRATA_CPU12 (1 << 3)
#define SILICON_ERRATA_CPU13 (1 << 4)
#define SILICON_ERRATA_CPU19 (1 << 5)
static void
msp430_set_arch (int option)
{
char str[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 a copy of the same data structure found in gcc/config/msp430/msp430.c
Keep these two structures in sync.
The data in this structure has been extracted from version 1.194 of the
devices.csv file released by TI in September 2016. */
struct msp430_mcu_data
{
const char * name;
unsigned int revision; /* 0=> MSP430, 1=>MSP430X, 2=> MSP430Xv2. */
unsigned int hwmpy; /* 0=>none, 1=>16-bit, 2=>16-bit w/sign extend, 4=>32-bit, 8=> 32-bit (5xx). */
}
msp430_mcu_data [] =
{
{ "cc430f5123",2,8 },
{ "cc430f5125",2,8 },
{ "cc430f5133",2,8 },
{ "cc430f5135",2,8 },
{ "cc430f5137",2,8 },
{ "cc430f5143",2,8 },
{ "cc430f5145",2,8 },
{ "cc430f5147",2,8 },
{ "cc430f6125",2,8 },
{ "cc430f6126",2,8 },
{ "cc430f6127",2,8 },
{ "cc430f6135",2,8 },
{ "cc430f6137",2,8 },
{ "cc430f6143",2,8 },
{ "cc430f6145",2,8 },
{ "cc430f6147",2,8 },
{ "msp430afe221",0,2 },
{ "msp430afe222",0,2 },
{ "msp430afe223",0,2 },
{ "msp430afe231",0,2 },
{ "msp430afe232",0,2 },
{ "msp430afe233",0,2 },
{ "msp430afe251",0,2 },
{ "msp430afe252",0,2 },
{ "msp430afe253",0,2 },
{ "msp430bt5190",2,8 },
{ "msp430c091",0,0 },
{ "msp430c092",0,0 },
{ "msp430c111",0,0 },
{ "msp430c1111",0,0 },
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{ "msp430g2544",0,0 },
{ "msp430g2553",0,0 },
{ "msp430g2744",0,0 },
{ "msp430g2755",0,0 },
{ "msp430g2855",0,0 },
{ "msp430g2955",0,0 },
{ "msp430i2020",0,2 },
{ "msp430i2021",0,2 },
{ "msp430i2030",0,2 },
{ "msp430i2031",0,2 },
{ "msp430i2040",0,2 },
{ "msp430i2041",0,2 },
{ "msp430i2xxgeneric",0,2 },
{ "msp430l092",0,0 },
{ "msp430p112",0,0 },
{ "msp430p313",0,0 },
{ "msp430p315",0,0 },
{ "msp430p315s",0,0 },
{ "msp430p325",0,0 },
{ "msp430p337",0,1 },
{ "msp430sl5438a",2,8 },
{ "msp430tch5e",0,0 },
{ "msp430xgeneric",2,8 },
{ "rf430f5144",2,8 },
{ "rf430f5155",2,8 },
{ "rf430f5175",2,8 },
{ "rf430frl152h",0,0 },
{ "rf430frl152h_rom",0,0 },
{ "rf430frl153h",0,0 },
{ "rf430frl153h_rom",0,0 },
{ "rf430frl154h",0,0 },
{ "rf430frl154h_rom",0,0 }
};
int
md_parse_option (int c, const char * arg)
{
switch (c)
{
case OPTION_SILICON_ERRATA:
case OPTION_SILICON_ERRATA_WARN:
{
signed int i;
const struct
{
const char * name;
unsigned int length;
unsigned int bitfield;
} erratas[] =
{
{ STRING_COMMA_LEN ("cpu4"), SILICON_ERRATA_CPU4 },
{ STRING_COMMA_LEN ("cpu8"), SILICON_ERRATA_CPU8 },
{ STRING_COMMA_LEN ("cpu11"), SILICON_ERRATA_CPU11 },
{ STRING_COMMA_LEN ("cpu12"), SILICON_ERRATA_CPU12 },
{ STRING_COMMA_LEN ("cpu13"), SILICON_ERRATA_CPU13 },
{ STRING_COMMA_LEN ("cpu19"), SILICON_ERRATA_CPU19 },
};
do
{
for (i = ARRAY_SIZE (erratas); i--;)
if (strncasecmp (arg, erratas[i].name, erratas[i].length) == 0)
{
if (c == OPTION_SILICON_ERRATA)
silicon_errata_fix |= erratas[i].bitfield;
else
silicon_errata_warn |= erratas[i].bitfield;
arg += erratas[i].length;
break;
}
if (i < 0)
{
as_warn (_("Unrecognised CPU errata name starting here: %s"), arg);
break;
}
if (*arg == 0)
break;
if (*arg != ',')
as_warn (_("Expecting comma after CPU errata name, not: %s"), arg);
else
arg ++;
}
while (*arg != 0);
}
return 1;
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 = ARRAY_SIZE (msp430_mcu_data); i--;)
if (strcasecmp (msp430_mcu_data[i].name, arg) == 0)
{
switch (msp430_mcu_data[i].revision)
{
case 0: selected_isa = MSP_ISA_430; break;
case 1: selected_isa = MSP_ISA_430X; break;
case 2: selected_isa = MSP_ISA_430Xv2; break;
}
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_UNKNOWN_INTR_NOPS:
do_unknown_interrupt_nops = true;
return 1;
case OPTION_NO_UNKNOWN_INTR_NOPS:
do_unknown_interrupt_nops = false;
return 1;
case OPTION_MOVE_DATA:
/* Silently ignored. */
return 1;
case OPTION_DATA_REGION:
if (strcmp (arg, "upper") == 0
|| strcmp (arg, "either") == 0)
upper_data_region_in_use = true;
if (strcmp (arg, "upper") == 0
|| strcmp (arg, "either") == 0
/* With data-region=none, the compiler has generated code assuming
data could be in the upper region, but nothing has been explicitly
placed there. */
|| strcmp (arg, "none") == 0)
lower_data_region_only = false;
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_make_init_symbols (const char * name)
{
if (startswith (name, ".bss")
|| startswith (name, ".lower.bss")
|| startswith (name, ".either.bss")
|| startswith (name, ".gnu.linkonce.b."))
(void) symbol_find_or_make ("__crt0_init_bss");
if (startswith (name, ".data")
|| startswith (name, ".lower.data")
|| startswith (name, ".either.data")
|| startswith (name, ".gnu.linkonce.d."))
(void) symbol_find_or_make ("__crt0_movedata");
/* Note - data assigned to the .either.data section may end up being
placed in the .upper.data section if the .lower.data section is
full. Hence the need to define the crt0 symbol.
The linker may create upper or either data sections, even when none exist
at the moment, so use the value of the data-region flag to determine if
the symbol is needed. */
if (startswith (name, ".either.data")
|| startswith (name, ".upper.data")
|| upper_data_region_in_use)
(void) symbol_find_or_make ("__crt0_move_highdata");
/* See note about .either.data above. */
if (startswith (name, ".upper.bss")
|| startswith (name, ".either.bss")
|| upper_data_region_in_use)
(void) symbol_find_or_make ("__crt0_init_highbss");
/* The following symbols are for the crt0 functions that run through
the different .*_array sections and call the functions placed there.
- init_array stores global static C++ constructors to run before main.
- preinit_array is not expected to ever be used for MSP430.
GCC only places initialization functions for runtime "sanitizers"
(i.e. {a,l,t,u}san) and "virtual table verification" in preinit_array.
- fini_array stores global static C++ destructors to run after calling
exit() or returning from main.
__crt0_run_array is required to actually call the functions in the above
arrays. */
if (startswith (name, ".init_array"))
{
(void) symbol_find_or_make ("__crt0_run_init_array");
(void) symbol_find_or_make ("__crt0_run_array");
}
else if (startswith (name, ".preinit_array"))
{
(void) symbol_find_or_make ("__crt0_run_preinit_array");
(void) symbol_find_or_make ("__crt0_run_array");
}
else if (startswith (name, ".fini_array"))
{
(void) symbol_find_or_make ("__crt0_run_fini_array");
(void) symbol_find_or_make ("__crt0_run_array");
}
}
static void
msp430_section (int arg)
{
char * saved_ilp = input_line_pointer;
const char * name = obj_elf_section_name ();
msp430_make_init_symbols (name);
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;
msp430_make_init_symbols (name);
}
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);
}
/* Handle a .mspabi_attribute or .gnu_attribute directive.
attr_type is 0 for .mspabi_attribute or 1 for .gnu_attribute.
This is only used for validating the attributes in the assembly file against
the options gas has been invoked with. If the attributes and options are
compatible then we add the attributes to the assembly file in
msp430_md_end. */
static void
msp430_object_attribute (int attr_type)
{
char tag_name_s[32];
char tag_value_s[32];
int tag_name, tag_value;
/* First operand is the tag name, second is the tag value e.g.
".mspabi_attribute 4, 2". */
input_line_pointer = extract_operand (input_line_pointer, tag_name_s, 32);
input_line_pointer = extract_operand (input_line_pointer, tag_value_s, 32);
tag_name = atoi (tag_name_s);
tag_value = atoi (tag_value_s);
/* If the attribute directive is present, the tag_value should never be set
to 0. */
if (tag_name == 0 || tag_value == 0)
as_bad (_("bad arguments \"%s\" and/or \"%s\" in %s directive"),
tag_name_s, tag_value_s, (attr_type ? ".gnu_attribute"
: ".mspabi_attribute"));
else if (attr_type == 0)
/* Handle .mspabi_attribute. */
switch (tag_name)
{
case OFBA_MSPABI_Tag_ISA:
switch (tag_value)
{
case OFBA_MSPABI_Val_ISA_MSP430:
if (target_is_430x ())
as_bad (_("file was compiled for the 430 ISA but the %s ISA is "
"selected"), (target_is_430xv2 () ? "430X" : "430Xv2"));
break;
case OFBA_MSPABI_Val_ISA_MSP430X:
if (!target_is_430x ())
as_bad (_("file was compiled for the 430X ISA but the 430 ISA is "
"selected"));
break;
default:
as_bad (_("unknown MSPABI build attribute value '%d' for "
"OFBA_MSPABI_Tag_ISA(%d) in .mspabi_attribute directive"),
tag_value, OFBA_MSPABI_Tag_ISA);
break;
}
break;
case OFBA_MSPABI_Tag_Code_Model:
/* Fall through. */
case OFBA_MSPABI_Tag_Data_Model:
/* FIXME: Might we want to set the memory model to large if the assembly
file has the large model attribute, but -ml has not been passed? */
switch (tag_value)
{
case OFBA_MSPABI_Val_Code_Model_SMALL:
if (large_model)
as_bad (_("file was compiled for the small memory model, but the "
"large memory model is selected"));
break;
case OFBA_MSPABI_Val_Code_Model_LARGE:
if (!large_model)
as_bad (_("file was compiled for the large memory model, "
"but the small memory model is selected"));
break;
default:
as_bad (_("unknown MSPABI build attribute value '%d' for %s(%d) "
"in .mspabi_attribute directive"), tag_value,
(tag_name == OFBA_MSPABI_Tag_Code_Model
? "OFBA_MSPABI_Tag_Code_Model"
: "OFBA_MSPABI_Tag_Data_Model"),
(tag_name == OFBA_MSPABI_Tag_Code_Model
? OFBA_MSPABI_Tag_Code_Model
: OFBA_MSPABI_Tag_Data_Model));
break;
}
break;
default:
as_bad (_("unknown MSPABI build attribute tag '%d' in "
".mspabi_attribute directive"), tag_name);
break;
}
else if (attr_type == 1)
/* Handle .gnu_attribute. */
switch (tag_name)
{
case Tag_GNU_MSP430_Data_Region:
/* This attribute is only applicable in the large memory model. */
if (!large_model)
break;
switch (tag_value)
{
case Val_GNU_MSP430_Data_Region_Lower:
if (!lower_data_region_only)
as_bad (_("file was compiled assuming all data will be in the "
"lower memory region, but the upper region is in use"));
break;
case Val_GNU_MSP430_Data_Region_Any:
if (lower_data_region_only)
as_bad (_("file was compiled assuming data could be in the upper "
"memory region, but the lower data region is "
"exclusively in use"));
break;
default:
as_bad (_("unknown GNU build attribute value '%d' for "
"Tag_GNU_MSP430_Data_Region(%d) in .gnu_attribute "
"directive"), tag_value, Tag_GNU_MSP430_Data_Region);
}
}
else
as_bad (_("internal: unexpected argument '%d' to msp430_object_attribute"),
attr_type);
}
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},
{"mspabi_attribute", msp430_object_attribute, 0},
{"gnu_attribute", msp430_object_attribute, 1},
{NULL, NULL, 0}
};
const char *md_shortopts = "mm:,mP,mQ,ml,mN,mn,my,mY,mu,mU";
struct option md_longopts[] =
{
{"msilicon-errata", required_argument, NULL, OPTION_SILICON_ERRATA},
{"msilicon-errata-warn", required_argument, NULL, OPTION_SILICON_ERRATA_WARN},
{"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},
{"mu", no_argument, NULL, OPTION_UNKNOWN_INTR_NOPS},
{"mU", no_argument, NULL, OPTION_NO_UNKNOWN_INTR_NOPS},
{"md", no_argument, NULL, OPTION_MOVE_DATA},
{"mdata-region", required_argument, NULL, OPTION_DATA_REGION},
{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,
_(" -msilicon-errata=<name>[,<name>...] - enable fixups for silicon errata\n"
" -msilicon-errata-warn=<name>[,<name>...] - warn when a fixup might be needed\n"
" supported errata names: cpu4, cpu8, cpu11, cpu12, cpu13, cpu19\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,
_(" -mU - for an instruction which changes interrupt state, but where it is not\n"
" known how the state is changed, do not warn/insert NOPs\n"));
fprintf (stream,
_(" -mu - for an instruction which changes interrupt state, but where it is not\n"
" known how the state is changed, warn/insert NOPs (default)\n"
" -mn and/or -my are required for this to have any effect\n"));
fprintf (stream,
_(" -mdata-region={none|lower|upper|either} - select region data will be\n"
" placed in.\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;
}
const 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 = str_htab_create ();
for (opcode = msp430_opcodes; opcode->name; opcode++)
str_hash_insert (msp430_hash, opcode->name, opcode, 0);
bfd_set_arch_mach (stdoutput, TARGET_ARCH,
target_is_430x () ? bfd_mach_msp430x : bfd_mach_msp11);
/* Set linkrelax here to avoid fixups in most sections. */
linkrelax = 1;
}
static inline bool
is_regname_end (char c)
{
return (c == 0 || ! ISALNUM (c));
}
/* 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)
{
char * endt;
signed long int val;
if (t == NULL || t[0] == 0)
return -1;
if (*t == 'r' || *t == 'R')
++t;
if (strncasecmp (t, "pc", 2) == 0 && is_regname_end (t[2]))
return 0;
if (strncasecmp (t, "sp", 2) == 0 && is_regname_end (t[2]))
return 1;
if (strncasecmp (t, "sr", 2) == 0 && is_regname_end (t[2]))
return 2;
if (*t == '0' && is_regname_end (t[1]))
return 0;
val = strtol (t, & endt, 0);
if (val < 1 || val > 15)
return -1;
if (is_regname_end (*endt))
return val;
return -1;
}
static int
msp430_srcoperand (struct msp430_operand_s * op,
char * l,
int bin,
bool * imm_op,
bool allow_20bit_values,
bool constants_allowed)
{
char * end;
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;
/* Use all parts of the constant expression by default. */
enum msp430_expp_e expp = MSP_EXPP_ALL;
/* 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 an immediate expression: #hlo(1231231231). */
*imm_op = true;
if (strncasecmp (h, "#llo(", 5) == 0)
{
vshift = 0;
rval = 3;
expp = MSP_EXPP_LLO;
}
else if (strncasecmp (h, "#lhi(", 5) == 0)
{
vshift = 1;
rval = 3;
expp = MSP_EXPP_LHI;
}
else if (strncasecmp (h, "#hlo(", 5) == 0)
{
vshift = 2;
rval = 3;
expp = MSP_EXPP_HLO;
}
else if (strncasecmp (h, "#hhi(", 5) == 0)
{
vshift = 3;
rval = 3;
expp = MSP_EXPP_HHI;
}
else if (strncasecmp (h, "#lo(", 4) == 0)
{
vshift = 0;
rval = 2;
expp = MSP_EXPP_LO;
}
else if (strncasecmp (h, "#hi(", 4) == 0)
{
vshift = 1;
rval = 2;
expp = MSP_EXPP_HI;
}
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;
op->expp = expp;
end = parse_exp (__tl, &(op->exp));
if (end != NULL && *end != 0 && *end != ')' )
{
as_bad (_("extra characters '%s' at end of immediate expression '%s'"), end, l);
return 1;
}
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)
{
if (bin == 0x1200 && ! target_is_430x ())
{
/* CPU4: The shorter form of PUSH #4 is not supported on MSP430. */
if (silicon_errata_warn & SILICON_ERRATA_CPU4)
as_warn (_("cpu4: not converting PUSH #4 to shorter form"));
/* No need to check silicon_errata_fixes - this fix is always implemented. */
}
else
{
op->reg = 2;
op->am = 2;
op->ol = 0;
op->mode = OP_REG;
}
}
else if (x == 8)
{
if (bin == 0x1200 && ! target_is_430x ())
{
/* CPU4: The shorter form of PUSH #8 is not supported on MSP430. */
if (silicon_errata_warn & SILICON_ERRATA_CPU4)
as_warn (_("cpu4: not converting PUSH #8 to shorter form"));
}
else
{
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() or #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;
end = parse_exp (__tl, &(op->exp));
if (end != NULL && *end != 0)
{
as_bad (_("extra characters '%s' at the end of absolute operand '%s'"), end, l);
return 1;
}
op->mode = OP_EXP;
op->vshift = 0;
op->expp = MSP_EXPP_ALL;
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;
op->expp = MSP_EXPP_ALL;
end = parse_exp (__tl, &(op->exp));
if (end != NULL && *end != 0)
{
as_bad (_("extra characters '%s' at end of operand '%s'"), end, l);
return 1;
}
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;
}
if (op->reg == 1 && (x & 1))
{
if (silicon_errata_fix & SILICON_ERRATA_CPU8)
as_bad (_("CPU8: Stack pointer accessed with an odd offset"));
else if (silicon_errata_warn & SILICON_ERRATA_CPU8)
as_warn (_("CPU8: Stack pointer accessed with an odd offset"));
}
}
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)'. */
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;
op->expp = MSP_EXPP_ALL;
__tl = l;
end = parse_exp (__tl, &(op->exp));
if (end != NULL && * end != 0)
{
as_bad (_("extra characters '%s' at end of operand '%s'"), end, l);
return 1;
}
return 0;
}
static int
msp430_dstoperand (struct msp430_operand_s * op,
char * l,
int bin,
bool allow_20bit_values,
bool constants_allowed)
{
bool dummy;
int ret = msp430_srcoperand (op, l, bin, & dummy,
allow_20bit_values,
constants_allowed);
if (ret)
return ret;
if (op->am == 2)
{
char *__tl = (char *) "0";
op->mode = OP_EXP;
op->am = 1;
op->ol = 1;
op->vshift = 0;
op->expp = MSP_EXPP_ALL;
(void) 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 (bool 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;
}
#define NOP_CHECK_INTERRUPT (1 << 0)
#define NOP_CHECK_CPU12 (1 << 1)
#define NOP_CHECK_CPU19 (1 << 2)
static signed int check_for_nop = 0;
#define is_opcode(NAME) (strcmp (opcode->name, NAME) == 0)
/* is_{e,d}int only check the explicit enabling/disabling of interrupts.
For MOV insns, more sophisticated processing is needed to determine if they
result in enabling/disabling interrupts. */
#define is_dint(OPCODE, BIN) ((strcmp (OPCODE, "dint") == 0) \
|| ((strcmp (OPCODE, "bic") == 0) \
&& BIN == 0xc232) \
|| ((strcmp (OPCODE, "clr") == 0) \
&& BIN == 0x4302))
#define is_eint(OPCODE, BIN) ((strcmp (OPCODE, "eint") == 0) \
|| ((strcmp (OPCODE, "bis") == 0) \
&& BIN == 0xd232))
const char * const INSERT_NOP_BEFORE_EINT = "NOP inserted here, before an interrupt enable instruction";
const char * const INSERT_NOP_AFTER_DINT = "NOP inserted here, after an interrupt disable instruction";
const char * const INSERT_NOP_AFTER_EINT = "NOP inserted here, after an interrupt enable instruction";
const char * const INSERT_NOP_BEFORE_UNKNOWN = "NOP inserted here, before this interrupt state change";
const char * const INSERT_NOP_AFTER_UNKNOWN ="NOP inserted here, after the instruction that changed interrupt state";
const char * const INSERT_NOP_AT_EOF = "NOP inserted after the interrupt state change at the end of the file";
const char * const WARN_NOP_BEFORE_EINT = "a NOP might be needed here, before an interrupt enable instruction";
const char * const WARN_NOP_AFTER_DINT = "a NOP might be needed here, after an interrupt disable instruction";
const char * const WARN_NOP_AFTER_EINT = "a NOP might be needed here, after an interrupt enable instruction";
const char * const WARN_NOP_BEFORE_UNKNOWN = "a NOP might be needed here, before this interrupt state change";
const char * const WARN_NOP_AFTER_UNKNOWN = "a NOP might also be needed here, after the instruction that changed interrupt state";
const char * const WARN_NOP_AT_EOF = "a NOP might be needed after the interrupt state change at the end of the file";
static void
gen_nop (void)
{
char *frag;
frag = frag_more (2);
bfd_putl16 ((bfd_vma) 0x4303 /* NOP */, frag);
dwarf2_emit_insn (2);
}
/* Insert/inform about adding a NOP if this insn enables interrupts. */
static void
warn_eint_nop (bool prev_insn_is_nop, bool prev_insn_is_dint)
{
if (prev_insn_is_nop
/* If the last insn was a DINT, we will have already warned that a NOP is
required after it. */
|| prev_insn_is_dint
/* 430 ISA does not require a NOP before EINT. */
|| (! target_is_430x ()))
return;
if (gen_interrupt_nops)
{
gen_nop ();
if (warn_interrupt_nops)
as_warn (_(INSERT_NOP_BEFORE_EINT));
}
else if (warn_interrupt_nops)
as_warn (_(WARN_NOP_BEFORE_EINT));
}
/* Use when unsure what effect the insn will have on the interrupt status,
to insert/warn about adding a NOP before the current insn. */
static void
warn_unsure_interrupt (bool prev_insn_is_nop,
bool prev_insn_is_dint)
{
if (prev_insn_is_nop
/* If the last insn was a DINT, we will have already warned that a NOP is
required after it. */
|| prev_insn_is_dint
/* 430 ISA does not require a NOP before EINT or DINT. */
|| (! target_is_430x ()))
return;
if (gen_interrupt_nops)
{
gen_nop ();
if (warn_interrupt_nops)
as_warn (_(INSERT_NOP_BEFORE_UNKNOWN));
}
else if (warn_interrupt_nops)
as_warn (_(WARN_NOP_BEFORE_UNKNOWN));
}
/* 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;
char *end;
int where;
struct msp430_operand_s op1, op2;
int res = 0;
static short ZEROS = 0;
bool byte_op, imm_op;
int op_length = 0;
int fmt;
int extended = 0x1800;
bool extended_op = false;
bool addr_op;
const char * error_message;
static signed int repeat_count = 0;
static bool prev_insn_is_nop = false;
static bool prev_insn_is_dint = false;
static bool prev_insn_is_eint = false;
/* We might decide before the end of the function that the current insn is
equivalent to DINT/EINT. */
bool this_insn_is_dint = false;
bool this_insn_is_eint = false;
bool fix_emitted;
/* 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 == '.')
{
bool 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"),