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old-cross-binutils/sim/msp430/msp430-sim.c
Nick Clifton 8969934d31 Add support for emulating the MSP430 hardware multiply feature. 
* msp430-sim.c (sim_open): Do not allocate memory over the
	hardware multiply registers.
	(get_op): Add support for reads from the hardware multiply
	registers.
	(put_op): Add support for writes to the hardware multiply
	registers.
	(msp430_step_once): Add support for the RETI instruction used by
	the CPUX architecture.
2014-05-08 08:53:16 +01:00

1588 lines
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/* Simulator for TI MSP430 and MSP430X
Copyright (C) 2013-2014 Free Software Foundation, Inc.
Contributed by Red Hat.
Based on sim/bfin/bfin-sim.c which was contributed by Analog Devices, Inc.
This file is part of simulators.
This program 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 of the License, or
(at your option) any later version.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <assert.h>
#include "bfd.h"
#include "opcode/msp430-decode.h"
#include "sim-main.h"
#include "dis-asm.h"
#include "targ-vals.h"
static int
loader_write_mem (SIM_DESC sd,
SIM_ADDR taddr,
const unsigned char *buf,
int bytes)
{
SIM_CPU *cpu = MSP430_CPU (sd);
return sim_core_write_buffer (sd, cpu, write_map, buf, taddr, bytes);
}
static sim_cia
msp430_pc_fetch (SIM_CPU *cpu)
{
return cpu->state.regs[0];
}
static void
msp430_pc_store (SIM_CPU *cpu, sim_cia newpc)
{
cpu->state.regs[0] = newpc;
}
static long
lookup_symbol (SIM_DESC sd, const char *name)
{
struct bfd *abfd = STATE_PROG_BFD (sd);
asymbol **symbol_table = STATE_SYMBOL_TABLE (sd);
long number_of_symbols = STATE_NUM_SYMBOLS (sd);
long i;
if (symbol_table == NULL)
{
long storage_needed;
storage_needed = bfd_get_symtab_upper_bound (abfd);
if (storage_needed <= 0)
return -1;
STATE_SYMBOL_TABLE (sd) = symbol_table = xmalloc (storage_needed);
STATE_NUM_SYMBOLS (sd) = number_of_symbols =
bfd_canonicalize_symtab (abfd, symbol_table);
}
for (i = 0; i < number_of_symbols; i++)
if (strcmp (symbol_table[i]->name, name) == 0)
{
long val = symbol_table[i]->section->vma + symbol_table[i]->value;
return val;
}
return -1;
}
static int
msp430_reg_fetch (SIM_CPU *cpu, int regno, unsigned char *buf, int len)
{
if (0 <= regno && regno < 16)
{
if (len == 2)
{
int val = cpu->state.regs[regno];
buf[0] = val & 0xff;
buf[1] = (val >> 8) & 0xff;
return 0;
}
else if (len == 4)
{
int val = cpu->state.regs[regno];
buf[0] = val & 0xff;
buf[1] = (val >> 8) & 0xff;
buf[2] = (val >> 16) & 0x0f; /* Registers are only 20 bits wide. */
buf[3] = 0;
return 0;
}
else
return -1;
}
else
return -1;
}
static int
msp430_reg_store (SIM_CPU *cpu, int regno, unsigned char *buf, int len)
{
if (0 <= regno && regno < 16)
{
if (len == 2)
{
cpu->state.regs[regno] = (buf[1] << 8) | buf[0];
return len;
}
if (len == 4)
{
cpu->state.regs[regno] = ((buf[2] << 16) & 0xf0000)
| (buf[1] << 8) | buf[0];
return len;
}
}
return -1;
}
static inline void
msp430_initialize_cpu (SIM_DESC sd, SIM_CPU *cpu)
{
memset (&cpu->state, 0, sizeof (cpu->state));
}
SIM_DESC
sim_open (SIM_OPEN_KIND kind,
struct host_callback_struct *callback,
struct bfd *abfd,
char **argv)
{
SIM_DESC sd = sim_state_alloc (kind, callback);
char c;
struct bfd *prog_bfd;
/* Initialise the simulator. */
if (sim_cpu_alloc_all (sd, 1, /*cgen_cpu_max_extra_bytes ()*/0) != SIM_RC_OK)
{
sim_state_free (sd);
return 0;
}
if (sim_pre_argv_init (sd, argv[0]) != SIM_RC_OK)
{
sim_state_free (sd);
return 0;
}
if (sim_parse_args (sd, argv) != SIM_RC_OK)
{
sim_state_free (sd);
return 0;
}
CPU_PC_FETCH (MSP430_CPU (sd)) = msp430_pc_fetch;
CPU_PC_STORE (MSP430_CPU (sd)) = msp430_pc_store;
CPU_REG_FETCH (MSP430_CPU (sd)) = msp430_reg_fetch;
CPU_REG_STORE (MSP430_CPU (sd)) = msp430_reg_store;
/* Allocate memory if none specified by user. */
if (sim_core_read_buffer (sd, MSP430_CPU (sd), read_map, &c, 0x130, 1) == 0)
sim_do_commandf (sd, "memory-region 0,0x20");
if (sim_core_read_buffer (sd, MSP430_CPU (sd), read_map, &c, 0x200, 1) == 0)
sim_do_commandf (sd, "memory-region 0x200,0xffe00");
if (sim_core_read_buffer (sd, MSP430_CPU (sd), read_map, &c, 0xfffe, 1) == 0)
sim_do_commandf (sd, "memory-region 0xfffe,2");
if (sim_core_read_buffer (sd, MSP430_CPU (sd), read_map, &c, 0x10000, 1) == 0)
sim_do_commandf (sd, "memory-region 0x10000,0x100000");
/* Check for/establish the a reference program image. */
if (sim_analyze_program (sd,
(STATE_PROG_ARGV (sd) != NULL
? *STATE_PROG_ARGV (sd)
: NULL), abfd) != SIM_RC_OK)
{
sim_state_free (sd);
return 0;
}
prog_bfd = sim_load_file (sd, argv[0], callback,
"the program",
STATE_PROG_BFD (sd),
0 /* verbose */,
1 /* use LMA instead of VMA */,
loader_write_mem);
if (prog_bfd == NULL)
{
sim_state_free (sd);
return 0;
}
/* Establish any remaining configuration options. */
if (sim_config (sd) != SIM_RC_OK)
{
sim_state_free (sd);
return 0;
}
if (sim_post_argv_init (sd) != SIM_RC_OK)
{
sim_state_free (sd);
return 0;
}
/* CPU specific initialization. */
assert (MAX_NR_PROCESSORS == 1);
msp430_initialize_cpu (sd, MSP430_CPU (sd));
msp430_trace_init (STATE_PROG_BFD (sd));
MSP430_CPU (sd)->state.cio_breakpoint = lookup_symbol (sd, "C$$IO$$");
MSP430_CPU (sd)->state.cio_buffer = lookup_symbol (sd, "__CIOBUF__");
if (MSP430_CPU (sd)->state.cio_buffer == -1)
MSP430_CPU (sd)->state.cio_buffer = lookup_symbol (sd, "_CIOBUF_");
return sd;
}
void
sim_close (SIM_DESC sd,
int quitting)
{
free (STATE_SYMBOL_TABLE (sd));
sim_state_free (sd);
}
SIM_RC
sim_create_inferior (SIM_DESC sd,
struct bfd *abfd,
char **argv,
char **env)
{
unsigned char resetv[2];
int c;
int new_pc;
/* Set the PC to the default reset vector if available. */
c = sim_core_read_buffer (sd, MSP430_CPU (sd), read_map, resetv, 0xfffe, 2);
new_pc = resetv[0] + 256 * resetv[1];
/* If the reset vector isn't initialized, then use the ELF entry. */
if (abfd != NULL && !new_pc)
new_pc = bfd_get_start_address (abfd);
sim_pc_set (MSP430_CPU (sd), new_pc);
msp430_pc_store (MSP430_CPU (sd), new_pc);
return SIM_RC_OK;
}
typedef struct
{
SIM_DESC sd;
int gb_addr;
} Get_Byte_Local_Data;
static int
msp430_getbyte (void *vld)
{
Get_Byte_Local_Data *ld = (Get_Byte_Local_Data *)vld;
char buf[1];
SIM_DESC sd = ld->sd;
sim_core_read_buffer (sd, MSP430_CPU (sd), read_map, buf, ld->gb_addr, 1);
ld->gb_addr ++;
return buf[0];
}
#define REG(N) MSP430_CPU (sd)->state.regs[(N)]
#define PC REG(MSR_PC)
#define SP REG(MSR_SP)
#define SR REG(MSR_SR)
static const char *
register_names[] =
{
"PC", "SP", "SR", "CG", "R4", "R5", "R6", "R7", "R8",
"R9", "R10", "R11", "R12", "R13", "R14", "R15"
};
static void
trace_reg_put (SIM_DESC sd, int n, unsigned int v)
{
if (TRACE_VPU_P (MSP430_CPU (sd)))
trace_generic (sd, MSP430_CPU (sd), TRACE_VPU_IDX,
"PUT: %#x -> %s", v, register_names [n]);
REG (n) = v;
}
static unsigned int
trace_reg_get (SIM_DESC sd, int n)
{
if (TRACE_VPU_P (MSP430_CPU (sd)))
trace_generic (sd, MSP430_CPU (sd), TRACE_VPU_IDX,
"GET: %s -> %#x", register_names [n], REG (n));
return REG (n);
}
#define REG_PUT(N,V) trace_reg_put (sd, N, V)
#define REG_GET(N) trace_reg_get (sd, N)
/* Hardware multiply (and accumulate) support. */
static enum { UNSIGN_32, SIGN_32, UNSIGN_MAC_32, SIGN_MAC_32 } hwmult_type;
static unsigned32 hwmult_op1;
static unsigned32 hwmult_op2;
static unsigned32 hwmult_result;
static signed32 hwmult_signed_result;
static unsigned32 hwmult_accumulator;
static signed32 hwmult_signed_accumulator;
static enum { UNSIGN_64, SIGN_64 } hw32mult_type;
static unsigned64 hw32mult_op1;
static unsigned64 hw32mult_op2;
static unsigned64 hw32mult_result;
static unsigned int
zero_ext (unsigned int v, unsigned int bits)
{
v &= ((1 << bits) - 1);
return v;
}
static signed int
sign_ext (signed int v, unsigned int bits)
{
int sb = 1 << (bits-1); /* Sign bit. */
int mb = (1 << (bits-1)) - 1; /* Mantissa bits. */
if (v & sb)
v = v | ~mb;
else
v = v & mb;
return v;
}
static int
get_op (SIM_DESC sd, MSP430_Opcode_Decoded *opc, int n)
{
MSP430_Opcode_Operand *op = opc->op + n;
int rv;
int addr;
unsigned char buf[4];
int incval = 0;
switch (op->type)
{
case MSP430_Operand_Immediate:
rv = op->addend;
break;
case MSP430_Operand_Register:
rv = REG_GET (op->reg);
break;
case MSP430_Operand_Indirect:
case MSP430_Operand_Indirect_Postinc:
addr = op->addend;
if (op->reg != MSR_None)
{
int reg;
/* Index values are signed, but the sum is limited to 16
bits if the register < 64k, for MSP430 compatibility in
MSP430X chips. */
if (addr & 0x8000)
addr |= -1 << 16;
reg = REG_GET (op->reg);
addr += reg;
if (reg < 0x10000 && ! opc->ofs_430x)
addr &= 0xffff;
}
addr &= 0xfffff;
switch (opc->size)
{
case 8:
sim_core_read_buffer (sd, MSP430_CPU (sd), read_map, buf, addr, 1);
rv = buf[0];
break;
case 16:
sim_core_read_buffer (sd, MSP430_CPU (sd), read_map, buf, addr, 2);
rv = buf[0] | (buf[1] << 8);
break;
case 20:
case 32:
sim_core_read_buffer (sd, MSP430_CPU (sd), read_map, buf, addr, 4);
rv = buf[0] | (buf[1] << 8) | (buf[2] << 16) | (buf[3] << 24);
break;
default:
assert (! opc->size);
break;
}
#if 0
/* Hack - MSP430X5438 serial port status register. */
if (addr == 0x5dd)
rv = 2;
#endif
if (addr >= 0x130 && addr <= 0x15B)
{
switch (addr)
{
case 0x13A:
rv = zero_ext (hwmult_result, 16);
break;
case 0x13C:
switch (hwmult_type)
{
case UNSIGN_32:
rv = zero_ext (hwmult_result >> 16, 16);
break;
case SIGN_32:
rv = sign_ext (hwmult_signed_result >> 16, 16);
break;
}
break;
case 0x13E:
switch (hwmult_type)
{
case UNSIGN_32:
rv = 0;
break;
case SIGN_32:
rv = hwmult_signed_result < 0 ? -1 : 0;
break;
case UNSIGN_MAC_32:
rv = 0; /* FIXME: Should be carry of last accumulate. */
break;
case SIGN_MAC_32:
rv = hwmult_signed_accumulator < 0 ? -1 : 0;
break;
}
break;
case 0x154:
rv = zero_ext (hw32mult_result, 16);
break;
case 0x156:
rv = zero_ext (hw32mult_result >> 16, 16);
break;
case 0x158:
rv = zero_ext (hw32mult_result >> 32, 16);
break;
case 0x15A:
switch (hw32mult_type)
{
case UNSIGN_64: rv = zero_ext (hw32mult_result >> 48, 16); break;
case SIGN_64: rv = sign_ext (hw32mult_result >> 48, 16); break;
}
break;
default:
fprintf (stderr, "unimplemented HW MULT read!\n");
break;
}
}
if (TRACE_MEMORY_P (MSP430_CPU (sd)))
trace_generic (sd, MSP430_CPU (sd), TRACE_MEMORY_IDX,
"GET: [%#x].%d -> %#x", addr, opc->size, rv);
break;
default:
fprintf (stderr, "invalid operand %d type %d\n", n, op->type);
abort ();
}
switch (opc->size)
{
case 8:
rv &= 0xff;
incval = 1;
break;
case 16:
rv &= 0xffff;
incval = 2;
break;
case 20:
rv &= 0xfffff;
incval = 4;
break;
case 32:
rv &= 0xffffffff;
incval = 4;
break;
}
if (op->type == MSP430_Operand_Indirect_Postinc)
REG_PUT (op->reg, REG_GET (op->reg) + incval);
return rv;
}
static int
put_op (SIM_DESC sd, MSP430_Opcode_Decoded *opc, int n, int val)
{
MSP430_Opcode_Operand *op = opc->op + n;
int rv;
int addr;
unsigned char buf[4];
int incval = 0;
switch (opc->size)
{
case 8:
val &= 0xff;
break;
case 16:
val &= 0xffff;
break;
case 20:
val &= 0xfffff;
break;
case 32:
val &= 0xffffffff;
break;
}
switch (op->type)
{
case MSP430_Operand_Register:
REG (op->reg) = val;
REG_PUT (op->reg, val);
break;
case MSP430_Operand_Indirect:
case MSP430_Operand_Indirect_Postinc:
addr = op->addend;
if (op->reg != MSR_None)
{
int reg;
/* Index values are signed, but the sum is limited to 16
bits if the register < 64k, for MSP430 compatibility in
MSP430X chips. */
if (addr & 0x8000)
addr |= -1 << 16;
reg = REG_GET (op->reg);
addr += reg;
if (reg < 0x10000)
addr &= 0xffff;
}
addr &= 0xfffff;
if (TRACE_MEMORY_P (MSP430_CPU (sd)))
trace_generic (sd, MSP430_CPU (sd), TRACE_MEMORY_IDX,
"PUT: [%#x].%d <- %#x", addr, opc->size, val);
#if 0
/* Hack - MSP430X5438 serial port transmit register. */
if (addr == 0x5ce)
putchar (val);
#endif
if (addr >= 0x130 && addr <= 0x15B)
{
signed int a,b;
/* Hardware Multiply emulation. */
assert (opc->size == 16);
switch (addr)
{
case 0x130: hwmult_op1 = val; hwmult_type = UNSIGN_32; break;
case 0x132: hwmult_op1 = val; hwmult_type = SIGN_32; break;
case 0x134: hwmult_op1 = val; hwmult_type = UNSIGN_MAC_32; break;
case 0x136: hwmult_op1 = val; hwmult_type = SIGN_MAC_32; break;
case 0x138: hwmult_op2 = val;
switch (hwmult_type)
{
case UNSIGN_32:
hwmult_result = hwmult_op1 * hwmult_op2;
hwmult_signed_result = (signed) hwmult_result;
hwmult_accumulator = hwmult_signed_accumulator = 0;
break;
case SIGN_32:
a = sign_ext (hwmult_op1, 16);
b = sign_ext (hwmult_op2, 16);
hwmult_signed_result = a * b;
hwmult_result = (unsigned) hwmult_signed_result;
hwmult_accumulator = hwmult_signed_accumulator = 0;
break;
case UNSIGN_MAC_32:
hwmult_accumulator += hwmult_op1 * hwmult_op2;
hwmult_signed_accumulator += hwmult_op1 * hwmult_op2;
hwmult_result = hwmult_signed_result = 0;
break;
case SIGN_MAC_32:
a = sign_ext (hwmult_op1, 16);
b = sign_ext (hwmult_op2, 16);
hwmult_accumulator += a * b;
hwmult_signed_accumulator += a * b;
hwmult_result = hwmult_signed_result = 0;
break;
}
break;
case 0x140: hw32mult_op1 = val; hw32mult_type = UNSIGN_64; break;
case 0x142: hw32mult_op1 = (hw32mult_op1 & 0xFFFF) | (val << 16); break;
case 0x144: hw32mult_op1 = val; hw32mult_type = SIGN_64; break;
case 0x146: hw32mult_op1 = (hw32mult_op1 & 0xFFFF) | (val << 16); break;
case 0x150: hw32mult_op2 = val; break;
case 0x152: hw32mult_op2 = (hw32mult_op2 & 0xFFFF) | (val << 16);
switch (hw32mult_type)
{
case UNSIGN_64:
hw32mult_result = hw32mult_op1 * hw32mult_op2;
break;
case SIGN_64:
hw32mult_result = sign_ext (hw32mult_op1, 32) * sign_ext (hw32mult_op2, 32);
break;
}
break;
default:
fprintf (stderr, "unimplemented HW MULT write to %x!\n", addr);
break;
}
}
switch (opc->size)
{
case 8:
buf[0] = val;
sim_core_write_buffer (sd, MSP430_CPU (sd), write_map, buf, addr, 1);
break;
case 16:
buf[0] = val;
buf[1] = val >> 8;
sim_core_write_buffer (sd, MSP430_CPU (sd), write_map, buf, addr, 2);
break;
case 20:
case 32:
buf[0] = val;
buf[1] = val >> 8;
buf[2] = val >> 16;
buf[3] = val >> 24;
sim_core_write_buffer (sd, MSP430_CPU (sd), write_map, buf, addr, 4);
break;
default:
assert (! opc->size);
break;
}
break;
default:
fprintf (stderr, "invalid operand %d type %d\n", n, op->type);
abort ();
}
switch (opc->size)
{
case 8:
rv &= 0xff;
incval = 1;
break;
case 16:
rv &= 0xffff;
incval = 2;
break;
case 20:
rv &= 0xfffff;
incval = 4;
break;
case 32:
rv &= 0xffffffff;
incval = 4;
break;
}
if (op->type == MSP430_Operand_Indirect_Postinc)
{
int new_val = REG_GET (op->reg) + incval;
/* SP is always word-aligned. */
if (op->reg == MSR_SP && (new_val & 1))
new_val ++;
REG_PUT (op->reg, new_val);
}
return rv;
}
static void
mem_put_val (SIM_DESC sd, int addr, int val, int bits)
{
MSP430_Opcode_Decoded opc;
opc.size = bits;
opc.op[0].type = MSP430_Operand_Indirect;
opc.op[0].addend = addr;
opc.op[0].reg = MSR_None;
put_op (sd, &opc, 0, val);
}
static int
mem_get_val (SIM_DESC sd, int addr, int bits)
{
MSP430_Opcode_Decoded opc;
opc.size = bits;
opc.op[0].type = MSP430_Operand_Indirect;
opc.op[0].addend = addr;
opc.op[0].reg = MSR_None;
return get_op (sd, &opc, 0);
}
#define CIO_OPEN (0xF0)
#define CIO_CLOSE (0xF1)
#define CIO_READ (0xF2)
#define CIO_WRITE (0xF3)
#define CIO_LSEEK (0xF4)
#define CIO_UNLINK (0xF5)
#define CIO_GETENV (0xF6)
#define CIO_RENAME (0xF7)
#define CIO_GETTIME (0xF8)
#define CIO_GETCLK (0xF9)
#define CIO_SYNC (0xFF)
#define CIO_I(n) (parms[(n)] + parms[(n)+1] * 256)
#define CIO_L(n) (parms[(n)] + parms[(n)+1] * 256 \
+ parms[(n)+2] * 65536 + parms[(n)+3] * 16777216)
static void
msp430_cio (SIM_DESC sd)
{
/* A block of data at __CIOBUF__ describes the I/O operation to
perform. */
unsigned char raw_parms[13];
unsigned char parms[8];
long length;
int command;
unsigned char buffer[512];
long ret_buflen = 0;
long fd, addr, len, rv;
sim_core_read_buffer (sd, MSP430_CPU (sd), 0, parms,
MSP430_CPU (sd)->state.cio_buffer, 5);
length = CIO_I (0);
command = parms[2];
sim_core_read_buffer (sd, MSP430_CPU (sd), 0, parms,
MSP430_CPU (sd)->state.cio_buffer + 3, 8);
sim_core_read_buffer (sd, MSP430_CPU (sd), 0, buffer,
MSP430_CPU (sd)->state.cio_buffer + 11, length);
switch (command)
{
case CIO_WRITE:
fd = CIO_I (0);
len = CIO_I (2);
rv = write (fd, buffer, len);
parms[0] = rv & 0xff;
parms[1] = rv >> 8;
break;
}
sim_core_write_buffer (sd, MSP430_CPU (sd), 0, parms,
MSP430_CPU (sd)->state.cio_buffer + 4, 8);
if (ret_buflen)
sim_core_write_buffer (sd, MSP430_CPU (sd), 0, buffer,
MSP430_CPU (sd)->state.cio_buffer + 12, ret_buflen);
}
#define SRC get_op (sd, opcode, 1)
#define DSRC get_op (sd, opcode, 0)
#define DEST(V) put_op (sd, opcode, 0, (V))
static int
msp430_dis_read (bfd_vma memaddr,
bfd_byte *myaddr,
unsigned int length,
struct disassemble_info *dinfo)
{
SIM_DESC sd = dinfo->private_data;
sim_core_read_buffer (sd, MSP430_CPU (sd), 0, myaddr, memaddr, length);
return 0;
}
#define DO_ALU(OP,SOP,MORE) \
{ \
int s1 = DSRC; \
int s2 = SRC; \
int result = s1 OP s2 MORE; \
if (TRACE_ALU_P (MSP430_CPU (sd))) \
trace_generic (sd, MSP430_CPU (sd), TRACE_ALU_IDX, \
"ALU: %#x %s %#x %s = %#x", s1, SOP, s2, #MORE, result); \
DEST (result); \
}
#define SIGN (1 << (opcode->size - 1))
#define POS(x) (((x) & SIGN) ? 0 : 1)
#define NEG(x) (((x) & SIGN) ? 1 : 0)
#define SX(v) sign_ext (v, opcode->size)
#define ZX(v) zero_ext (v, opcode->size)
static char *
flags2string (int f)
{
static char buf[2][6];
static int bi = 0;
char *bp = buf[bi];
bi = (bi + 1) % 2;
bp[0] = f & MSP430_FLAG_V ? 'V' : '-';
bp[1] = f & MSP430_FLAG_N ? 'N' : '-';
bp[2] = f & MSP430_FLAG_Z ? 'Z' : '-';
bp[3] = f & MSP430_FLAG_C ? 'C' : '-';
bp[4] = 0;
return bp;
}
/* Random number that won't show up in our usual logic. */
#define MAGIC_OVERFLOW 0x55000F
static void
do_flags (SIM_DESC sd,
MSP430_Opcode_Decoded *opcode,
int vnz_val, /* Signed result. */
int carry,
int overflow)
{
int f = SR;
int new_f = 0;
int signbit = 1 << (opcode->size - 1);
f &= ~opcode->flags_0;
f &= ~opcode->flags_set;
f |= opcode->flags_1;
if (vnz_val & signbit)
new_f |= MSP430_FLAG_N;
if (! (vnz_val & ((signbit << 1) - 1)))
new_f |= MSP430_FLAG_Z;
if (overflow == MAGIC_OVERFLOW)
{
if (vnz_val != SX (vnz_val))
new_f |= MSP430_FLAG_V;
}
else
if (overflow)
new_f |= MSP430_FLAG_V;
if (carry)
new_f |= MSP430_FLAG_C;
new_f = f | (new_f & opcode->flags_set);
if (TRACE_ALU_P (MSP430_CPU (sd)))
{
if (SR != new_f)
trace_generic (sd, MSP430_CPU (sd), TRACE_ALU_IDX,
"FLAGS: %s -> %s", flags2string (SR),
flags2string (new_f));
else
trace_generic (sd, MSP430_CPU (sd), TRACE_ALU_IDX,
"FLAGS: %s", flags2string (new_f));
}
SR = new_f;
}
#define FLAGS(vnz,c) do_flags (sd, opcode, vnz, c, MAGIC_OVERFLOW)
#define FLAGSV(vnz,c,v) do_flags (sd, opcode, vnz, c, v)
/* These two assume unsigned 16-bit (four digit) words.
Mask off unwanted bits for byte operations. */
static int
bcd_to_binary (int v)
{
int r = ( ((v >> 0) & 0xf) * 1
+ ((v >> 4) & 0xf) * 10
+ ((v >> 8) & 0xf) * 100
+ ((v >> 12) & 0xf) * 1000);
return r;
}
static int
binary_to_bcd (int v)
{
int r = ( ((v / 1) % 10) << 0
| ((v / 10) % 10) << 4
| ((v / 100) % 10) << 8
| ((v / 1000) % 10) << 12);
return r;
}
static int
syscall_read_mem (host_callback *cb, struct cb_syscall *sc,
unsigned long taddr, char *buf, int bytes)
{
SIM_DESC sd = (SIM_DESC) sc->p1;
SIM_CPU *cpu = (SIM_CPU *) sc->p2;
return sim_core_read_buffer (sd, cpu, read_map, buf, taddr, bytes);
}
static int
syscall_write_mem (host_callback *cb, struct cb_syscall *sc,
unsigned long taddr, const char *buf, int bytes)
{
SIM_DESC sd = (SIM_DESC) sc->p1;
SIM_CPU *cpu = (SIM_CPU *) sc->p2;
return sim_core_write_buffer (sd, cpu, write_map, buf, taddr, bytes);
}
static const char *
cond_string (int cond)
{
switch (cond)
{
case MSC_nz:
return "NZ";
case MSC_z:
return "Z";
case MSC_nc:
return "NC";
case MSC_c:
return "C";
case MSC_n:
return "N";
case MSC_ge:
return "GE";
case MSC_l:
return "L";
case MSC_true:
return "MP";
default:
return "??";
}
}
/* Checks a CALL to address CALL_ADDR. If this is a special
syscall address then the call is simulated and non-zero is
returned. Otherwise 0 is returned. */
static int
maybe_perform_syscall (SIM_DESC sd, int call_addr)
{
if (call_addr == 0x00160)
{
int i;
for (i = 0; i < 16; i++)
{
if (i % 4 == 0)
fprintf (stderr, "\t");
fprintf (stderr, "R%-2d %05x ", i, MSP430_CPU (sd)->state.regs[i]);
if (i % 4 == 3)
{
int sp = SP + (3 - (i / 4)) * 2;
unsigned char buf[2];
sim_core_read_buffer (sd, MSP430_CPU (sd), read_map, buf, sp, 2);
fprintf (stderr, "\tSP%+d: %04x", sp - SP,
buf[0] + buf[1] * 256);
if (i / 4 == 0)
{
int flags = SR;
fprintf (stderr, flags & 0x100 ? " V" : " -");
fprintf (stderr, flags & 0x004 ? "N" : "-");
fprintf (stderr, flags & 0x002 ? "Z" : "-");
fprintf (stderr, flags & 0x001 ? "C" : "-");
}
fprintf (stderr, "\n");
}
}
return 1;
}
if ((call_addr & ~0x3f) == 0x00180)
{
/* Syscall! */
int syscall_num = call_addr & 0x3f;
host_callback *cb = STATE_CALLBACK (sd);
CB_SYSCALL sc;
CB_SYSCALL_INIT (&sc);
sc.func = syscall_num;
sc.arg1 = MSP430_CPU (sd)->state.regs[12];
sc.arg2 = MSP430_CPU (sd)->state.regs[13];
sc.arg3 = MSP430_CPU (sd)->state.regs[14];
sc.arg4 = MSP430_CPU (sd)->state.regs[15];
if (TRACE_SYSCALL_P (MSP430_CPU (sd)))
{
const char *syscall_name = "*unknown*";
switch (syscall_num)
{
case TARGET_SYS_exit:
syscall_name = "exit(%d)";
break;
case TARGET_SYS_open:
syscall_name = "open(%#x,%#x)";
break;
case TARGET_SYS_close:
syscall_name = "close(%d)";
break;
case TARGET_SYS_read:
syscall_name = "read(%d,%#x,%d)";
break;
case TARGET_SYS_write:
syscall_name = "write(%d,%#x,%d)";
break;
}
trace_generic (sd, MSP430_CPU (sd), TRACE_SYSCALL_IDX,
syscall_name, sc.arg1, sc.arg2, sc.arg3, sc.arg4);
}
/* Handle SYS_exit here. */
if (syscall_num == 1)
{
sim_engine_halt (sd, MSP430_CPU (sd), NULL,
MSP430_CPU (sd)->state.regs[0],
sim_exited, sc.arg1);
return 1;
}
sc.p1 = sd;
sc.p2 = MSP430_CPU (sd);
sc.read_mem = syscall_read_mem;
sc.write_mem = syscall_write_mem;
cb_syscall (cb, &sc);
if (TRACE_SYSCALL_P (MSP430_CPU (sd)))
trace_generic (sd, MSP430_CPU (sd), TRACE_SYSCALL_IDX,
"returns %ld", sc.result);
MSP430_CPU (sd)->state.regs[12] = sc.result;
return 1;
}
return 0;
}
static void
msp430_step_once (SIM_DESC sd)
{
Get_Byte_Local_Data ld;
unsigned char buf[100];
int i;
int opsize;
unsigned int opcode_pc;
MSP430_Opcode_Decoded opcode_buf;
MSP430_Opcode_Decoded *opcode = &opcode_buf;
int s1, s2, result;
int u1, u2, uresult;
int c, reg;
int sp;
int carry_to_use;
int n_repeats;
int rept;
int op_bytes, op_bits;
PC &= 0xfffff;
opcode_pc = PC;
if (opcode_pc < 0x10)
{
fprintf (stderr, "Fault: PC(%#x) is less than 0x10\n", opcode_pc);
sim_engine_halt (sd, MSP430_CPU (sd), NULL,
MSP430_CPU (sd)->state.regs[0],
sim_exited, -1);
return;
}
if (PC == MSP430_CPU (sd)->state.cio_breakpoint
&& STATE_OPEN_KIND (sd) != SIM_OPEN_DEBUG)
msp430_cio (sd);
ld.sd = sd;
ld.gb_addr = PC;
opsize = msp430_decode_opcode (MSP430_CPU (sd)->state.regs[0],
opcode, msp430_getbyte, &ld);
PC += opsize;
if (opsize <= 0)
{
fprintf (stderr, "Fault: undecodable opcode at %#x\n", opcode_pc);
sim_engine_halt (sd, MSP430_CPU (sd), NULL,
MSP430_CPU (sd)->state.regs[0],
sim_exited, -1);
return;
}
if (opcode->repeat_reg)
n_repeats = (MSP430_CPU (sd)->state.regs[opcode->repeats] & 0x000f) + 1;
else
n_repeats = opcode->repeats + 1;
op_bits = opcode->size;
switch (op_bits)
{
case 8:
op_bytes = 1;
break;
case 16:
op_bytes = 2;
break;
case 20:
case 32:
op_bytes = 4;
break;
}
if (TRACE_INSN_P (MSP430_CPU (sd)))
{
disassemble_info info;
unsigned char b[10];
msp430_trace_one (opcode_pc);
sim_core_read_buffer (sd, MSP430_CPU (sd), 0, b, opcode_pc, opsize);
init_disassemble_info (&info, stderr, (fprintf_ftype) fprintf);
info.private_data = sd;
info.read_memory_func = msp430_dis_read;
fprintf (stderr, "%#8x ", opcode_pc);
for (i = 0; i < opsize; i += 2)
fprintf (stderr, " %02x%02x", b[i+1], b[i]);
for (; i < 6; i += 2)
fprintf (stderr, " ");
fprintf (stderr, " ");
print_insn_msp430 (opcode_pc, &info);
fprintf (stderr, "\n");
fflush (stdout);
}
if (TRACE_ANY_P (MSP430_CPU (sd)))
trace_prefix (sd, MSP430_CPU (sd), NULL_CIA, opcode_pc,
TRACE_LINENUM_P (MSP430_CPU (sd)), NULL, 0, "");
carry_to_use = 0;
switch (opcode->id)
{
case MSO_unknown:
break;
/* Double-operand instructions. */
case MSO_mov:
if (opcode->n_bytes == 2
&& opcode->op[0].type == MSP430_Operand_Register
&& opcode->op[0].reg == MSR_CG
&& opcode->op[1].type == MSP430_Operand_Immediate
&& opcode->op[1].addend == 0
/* A 16-bit write of #0 is a NOP; an 8-bit write is a BRK. */
&& opcode->size == 8)
{
/* This is the designated software breakpoint instruction. */
PC -= opsize;
sim_engine_halt (sd, MSP430_CPU (sd), NULL,
MSP430_CPU (sd)->state.regs[0],
sim_stopped, SIM_SIGTRAP);
}
else
{
/* Otherwise, do the move. */
for (rept = 0; rept < n_repeats; rept ++)
{
DEST (SRC);
}
}
break;
case MSO_addc:
for (rept = 0; rept < n_repeats; rept ++)
{
carry_to_use = (SR & MSP430_FLAG_C) ? 1 : 0;
u1 = DSRC;
u2 = SRC;
s1 = SX (u1);
s2 = SX (u2);
uresult = u1 + u2 + carry_to_use;
result = s1 + s2 + carry_to_use;
if (TRACE_ALU_P (MSP430_CPU (sd)))
trace_generic (sd, MSP430_CPU (sd), TRACE_ALU_IDX,
"ADDC: %#x + %#x + %d = %#x",
u1, u2, carry_to_use, uresult);
DEST (result);
FLAGS (result, uresult != ZX (uresult));
}
break;
case MSO_add:
for (rept = 0; rept < n_repeats; rept ++)
{
u1 = DSRC;
u2 = SRC;
s1 = SX (u1);
s2 = SX (u2);
uresult = u1 + u2;
result = s1 + s2;
if (TRACE_ALU_P (MSP430_CPU (sd)))
trace_generic (sd, MSP430_CPU (sd), TRACE_ALU_IDX,
"ADD: %#x + %#x = %#x",
u1, u2, uresult);
DEST (result);
FLAGS (result, uresult != ZX (uresult));
}
break;
case MSO_subc:
for (rept = 0; rept < n_repeats; rept ++)
{
carry_to_use = (SR & MSP430_FLAG_C) ? 1 : 0;
u1 = DSRC;
u2 = SRC;
s1 = SX (u1);
s2 = SX (u2);
uresult = ZX (~u2) + u1 + carry_to_use;
result = s1 - s2 + (carry_to_use - 1);
if (TRACE_ALU_P (MSP430_CPU (sd)))
trace_generic (sd, MSP430_CPU (sd), TRACE_ALU_IDX,
"SUBC: %#x - %#x + %d = %#x",
u1, u2, carry_to_use, uresult);
DEST (result);
FLAGS (result, uresult != ZX (uresult));
}
break;
case MSO_sub:
for (rept = 0; rept < n_repeats; rept ++)
{
u1 = DSRC;
u2 = SRC;
s1 = SX (u1);
s2 = SX (u2);
uresult = ZX (~u2) + u1 + 1;
result = SX (uresult);
if (TRACE_ALU_P (MSP430_CPU (sd)))
trace_generic (sd, MSP430_CPU (sd), TRACE_ALU_IDX,
"SUB: %#x - %#x = %#x",
u1, u2, uresult);
DEST (result);
FLAGS (result, uresult != ZX (uresult));
}
break;
case MSO_cmp:
for (rept = 0; rept < n_repeats; rept ++)
{
u1 = DSRC;
u2 = SRC;
s1 = SX (u1);
s2 = SX (u2);
uresult = ZX (~u2) + u1 + 1;
result = s1 - s2;
if (TRACE_ALU_P (MSP430_CPU (sd)))
trace_generic (sd, MSP430_CPU (sd), TRACE_ALU_IDX,
"CMP: %#x - %#x = %x",
u1, u2, uresult);
FLAGS (result, uresult != ZX (uresult));
}
break;
case MSO_dadd:
for (rept = 0; rept < n_repeats; rept ++)
{
carry_to_use = (SR & MSP430_FLAG_C) ? 1 : 0;
u1 = DSRC;
u2 = SRC;
uresult = bcd_to_binary (u1) + bcd_to_binary (u2) + carry_to_use;
result = binary_to_bcd (uresult);
if (TRACE_ALU_P (MSP430_CPU (sd)))
trace_generic (sd, MSP430_CPU (sd), TRACE_ALU_IDX,
"DADD: %#x + %#x + %d = %#x",
u1, u2, carry_to_use, result);
DEST (result);
FLAGS (result, uresult > ((opcode->size == 8) ? 99 : 9999));
}
break;
case MSO_and:
for (rept = 0; rept < n_repeats; rept ++)
{
u1 = DSRC;
u2 = SRC;
uresult = u1 & u2;
if (TRACE_ALU_P (MSP430_CPU (sd)))
trace_generic (sd, MSP430_CPU (sd), TRACE_ALU_IDX,
"AND: %#x & %#x = %#x",
u1, u2, uresult);
DEST (uresult);
FLAGS (uresult, uresult != 0);
}
break;
case MSO_bit:
for (rept = 0; rept < n_repeats; rept ++)
{
u1 = DSRC;
u2 = SRC;
uresult = u1 & u2;
if (TRACE_ALU_P (MSP430_CPU (sd)))
trace_generic (sd, MSP430_CPU (sd), TRACE_ALU_IDX,
"BIT: %#x & %#x -> %#x",
u1, u2, uresult);
FLAGS (uresult, uresult != 0);
}
break;
case MSO_bic:
for (rept = 0; rept < n_repeats; rept ++)
{
u1 = DSRC;
u2 = SRC;
uresult = u1 & ~ u2;
if (TRACE_ALU_P (MSP430_CPU (sd)))
trace_generic (sd, MSP430_CPU (sd), TRACE_ALU_IDX,
"BIC: %#x & ~ %#x = %#x",
u1, u2, uresult);
DEST (uresult);
}
break;
case MSO_bis:
for (rept = 0; rept < n_repeats; rept ++)
{
u1 = DSRC;
u2 = SRC;
uresult = u1 | u2;
if (TRACE_ALU_P (MSP430_CPU (sd)))
trace_generic (sd, MSP430_CPU (sd), TRACE_ALU_IDX,
"BIS: %#x | %#x = %#x",
u1, u2, uresult);
DEST (uresult);
}
break;
case MSO_xor:
for (rept = 0; rept < n_repeats; rept ++)
{
s1 = 1 << (opcode->size - 1);
u1 = DSRC;
u2 = SRC;
uresult = u1 ^ u2;
if (TRACE_ALU_P (MSP430_CPU (sd)))
trace_generic (sd, MSP430_CPU (sd), TRACE_ALU_IDX,
"XOR: %#x & %#x = %#x",
u1, u2, uresult);
DEST (uresult);
FLAGSV (uresult, uresult != 0, (u1 & s1) && (u2 & s1));
}
break;
/* Single-operand instructions. Note: the decoder puts the same
operand in SRC as in DEST, for our convenience. */
case MSO_rrc:
for (rept = 0; rept < n_repeats; rept ++)
{
u1 = SRC;
carry_to_use = u1 & 1;
uresult = u1 >> 1;
if (SR & MSP430_FLAG_C)
uresult |= (1 << (opcode->size - 1));
if (TRACE_ALU_P (MSP430_CPU (sd)))
trace_generic (sd, MSP430_CPU (sd), TRACE_ALU_IDX,
"RRC: %#x >>= %#x",
u1, uresult);
DEST (uresult);
FLAGS (uresult, carry_to_use);
}
break;
case MSO_swpb:
for (rept = 0; rept < n_repeats; rept ++)
{
u1 = SRC;
uresult = ((u1 >> 8) & 0x00ff) | ((u1 << 8) & 0xff00);
if (TRACE_ALU_P (MSP430_CPU (sd)))
trace_generic (sd, MSP430_CPU (sd), TRACE_ALU_IDX,
"SWPB: %#x -> %#x",
u1, uresult);
DEST (uresult);
}
break;
case MSO_rra:
for (rept = 0; rept < n_repeats; rept ++)
{
u1 = SRC;
c = u1 & 1;
s1 = 1 << (opcode->size - 1);
uresult = (u1 >> 1) | (u1 & s1);
if (TRACE_ALU_P (MSP430_CPU (sd)))
trace_generic (sd, MSP430_CPU (sd), TRACE_ALU_IDX,
"RRA: %#x >>= %#x",
u1, uresult);
DEST (uresult);
FLAGS (uresult, c);
}
break;
case MSO_rru:
for (rept = 0; rept < n_repeats; rept ++)
{
u1 = SRC;
c = u1 & 1;
uresult = (u1 >> 1);
if (TRACE_ALU_P (MSP430_CPU (sd)))
trace_generic (sd, MSP430_CPU (sd), TRACE_ALU_IDX,
"RRU: %#x >>= %#x",
u1, uresult);
DEST (uresult);
FLAGS (uresult, c);
}
break;
case MSO_sxt:
for (rept = 0; rept < n_repeats; rept ++)
{
u1 = SRC;
if (u1 & 0x80)
uresult = u1 | 0xfff00;
else
uresult = u1 & 0x000ff;
if (TRACE_ALU_P (MSP430_CPU (sd)))
trace_generic (sd, MSP430_CPU (sd), TRACE_ALU_IDX,
"SXT: %#x -> %#x",
u1, uresult);
DEST (uresult);
FLAGS (uresult, c);
}
break;
case MSO_push:
for (rept = 0; rept < n_repeats; rept ++)
{
int new_sp;
new_sp = REG_GET (MSR_SP) - op_bytes;
/* SP is always word-aligned. */
if (new_sp & 1)
new_sp --;
REG_PUT (MSR_SP, new_sp);
u1 = SRC;
mem_put_val (sd, SP, u1, op_bits);
if (opcode->op[1].type == MSP430_Operand_Register)
opcode->op[1].reg --;
}
break;
case MSO_pop:
for (rept = 0; rept < n_repeats; rept ++)
{
int new_sp;
u1 = mem_get_val (sd, SP, op_bits);
DEST (u1);
if (opcode->op[0].type == MSP430_Operand_Register)
opcode->op[0].reg ++;
new_sp = REG_GET (MSR_SP) + op_bytes;
/* SP is always word-aligned. */
if (new_sp & 1)
new_sp ++;
REG_PUT (MSR_SP, new_sp);
}
break;
case MSO_call:
u1 = SRC;
if (maybe_perform_syscall (sd, u1))
break;
REG_PUT (MSR_SP, REG_GET (MSR_SP) - op_bytes);
mem_put_val (sd, SP, PC, op_bits);
if (TRACE_ALU_P (MSP430_CPU (sd)))
trace_generic (sd, MSP430_CPU (sd), TRACE_ALU_IDX,
"CALL: func %#x ret %#x, sp %#x",
u1, PC, SP);
REG_PUT (MSR_PC, u1);
break;
case MSO_reti:
u1 = mem_get_val (sd, SP, 16);
SR = u1 & 0xFF;
SP += 2;
PC = mem_get_val (sd, SP, 16);
SP += 2;
/* Emulate the RETI action of the 20-bit CPUX architecure.
This is safe for 16-bit CPU architectures as well, since the top
8-bits of SR will have been written to the stack here, and will
have been read as 0. */
PC |= (u1 & 0xF000) << 4;
if (TRACE_ALU_P (MSP430_CPU (sd)))
trace_generic (sd, MSP430_CPU (sd), TRACE_ALU_IDX,
"RETI: pc %#x sr %#x",
PC, SR);
break;
/* Jumps. */
case MSO_jmp:
i = SRC;
switch (opcode->cond)
{
case MSC_nz:
u1 = (SR & MSP430_FLAG_Z) ? 0 : 1;
break;
case MSC_z:
u1 = (SR & MSP430_FLAG_Z) ? 1 : 0;
break;
case MSC_nc:
u1 = (SR & MSP430_FLAG_C) ? 0 : 1;
break;
case MSC_c:
u1 = (SR & MSP430_FLAG_C) ? 1 : 0;
break;
case MSC_n:
u1 = (SR & MSP430_FLAG_N) ? 1 : 0;
break;
case MSC_ge:
u1 = (!!(SR & MSP430_FLAG_N) == !!(SR & MSP430_FLAG_V)) ? 1 : 0;
break;
case MSC_l:
u1 = (!!(SR & MSP430_FLAG_N) == !!(SR & MSP430_FLAG_V)) ? 0 : 1;
break;
case MSC_true:
u1 = 1;
break;
}
if (u1)
{
if (TRACE_BRANCH_P (MSP430_CPU (sd)))
trace_generic (sd, MSP430_CPU (sd), TRACE_BRANCH_IDX,
"J%s: pc %#x -> %#x sr %#x, taken",
cond_string (opcode->cond), PC, i, SR);
PC = i;
if (PC == opcode_pc)
exit (0);
}
else
if (TRACE_BRANCH_P (MSP430_CPU (sd)))
trace_generic (sd, MSP430_CPU (sd), TRACE_BRANCH_IDX,
"J%s: pc %#x to %#x sr %#x, not taken",
cond_string (opcode->cond), PC, i, SR);
break;
default:
fprintf (stderr, "error: unexpected opcode id %d\n", opcode->id);
exit (1);
}
}
void
sim_engine_run (SIM_DESC sd,
int next_cpu_nr,
int nr_cpus,
int siggnal)
{
while (1)
{
msp430_step_once (sd);
if (sim_events_tick (sd))
sim_events_process (sd);
}
}
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