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command.c
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command.c
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#include "6809.h"
#include "monitor.h"
#include "machine.h"
#include <sys/errno.h>
#ifdef HAVE_TERMIOS_H
# include <termios.h>
#else
#error
#endif
typedef struct
{
unsigned int size;
unsigned int count;
char **strings;
} cmdqueue_t;
typedef enum
{
LVALUE,
RVALUE,
} eval_mode_t;
#define MAKE_ADDR(devno, phyaddr) ((devno * 0x10000000L) + phyaddr)
/**********************************************************/
/********************* Global Data ************************/
/**********************************************************/
unsigned int break_count = 0;
breakpoint_t breaktab[MAX_BREAKS];
unsigned int active_break_count = 0;
unsigned int display_count = 0;
display_t displaytab[MAX_DISPLAYS];
unsigned int history_count = 0;
unsigned long historytab[MAX_HISTORY];
absolute_address_t examine_addr = 0;
unsigned int examine_repeat = 1;
datatype_t examine_type;
/* Thread tracking. thread_current points to a location in
* target memory where the current thread ID is kept. thread_id
* is the debugger's current cached value of that, to avoid
* reading memory constantly. The size allows for targets to
* define the ID format differently. */
unsigned int thread_id_size = 2;
absolute_address_t thread_current;
absolute_address_t thread_id = 0;
thread_t threadtab[MAX_THREADS];
#define MAX_CMD_QUEUES 8
int command_stack_depth = -1;
cmdqueue_t command_stack[MAX_CMD_QUEUES];
#define MAX_TRACE 256
target_addr_t trace_buffer[MAX_TRACE];
unsigned int trace_offset = 0;
int stop_after_ms = 0;
datatype_t print_type;
char *command_flags;
int exit_command_loop;
#define IRQ_CYCLE_COUNTS 128
unsigned int irq_cycle_tab[IRQ_CYCLE_COUNTS] = { 0, };
unsigned int irq_cycle_entry = 0;
unsigned long irq_cycles = 0;
unsigned long eval (char *expr);
unsigned long eval_mem (char *expr, eval_mode_t mode);
extern int auto_break_insn_count;
FILE *command_input;
/**********************************************************/
/******************** 6809 Functions **********************/
/**********************************************************/
void
print_addr (absolute_address_t addr)
{
const char *name;
print_device_name (addr >> 28);
putchar (':');
printf ("0x%04X", addr & 0xFFFFFF);
name = sym_lookup (&program_symtab, addr);
if (name)
printf (" <%-16.16s>", name);
else
printf ("%-20.20s", "");
}
/**********************************************************/
/*********************** Functions ************************/
/**********************************************************/
void
syntax_error (const char *string)
{
fprintf (stderr, "error: %s\n", string);
}
void
save_value (unsigned long val)
{
historytab[history_count++ % MAX_HISTORY] = val;
}
unsigned long
eval_historical (unsigned int id)
{
return historytab[id % MAX_HISTORY];
}
void
assign_virtual (const char *name, unsigned long val)
{
unsigned long v_val;
/* First check for a special variable with this name, and
* invoke its write handler. Otherwise, store to the
* user table. */
if (!sym_find (&auto_symtab, name, &v_val, 0))
{
virtual_handler_t virtual = (virtual_handler_t)v_val;
virtual (&val, 1);
return;
}
sym_set (&internal_symtab, name, val, 0);
if (!strcmp (name, "thread_current"))
{
printf ("Thread pointer initialized to ");
print_addr (val);
putchar ('\n');
thread_current = val;
}
}
unsigned long
eval_virtual (const char *name)
{
unsigned long val;
/* The name of the virtual is looked up in the global
* symbol table, which holds the pointer to a
* variable in simulator memory, or to a function
* that can compute the value on-the-fly. */
if (!sym_find (&auto_symtab, name, &val, 0))
{
virtual_handler_t virtual = (virtual_handler_t)val;
virtual (&val, 0);
}
else if (!sym_find (&internal_symtab, name, &val, 0))
{
}
else
{
return 0;
}
return val;
}
void
eval_assign (char *expr, unsigned long val)
{
if (*expr == '$')
{
assign_virtual (expr+1, val);
}
else
{
absolute_address_t dst = eval_mem (expr, LVALUE);
abs_write8 (dst, val);
}
}
unsigned long
target_read (absolute_address_t addr, unsigned int size)
{
switch (size)
{
case 1:
return abs_read8 (addr);
case 2:
return abs_read16 (addr);
}
}
void
parse_format_flag (const char *flags, unsigned char *formatp)
{
while (*flags)
{
switch (*flags)
{
case 'x':
case 'd':
case 'u':
case 'o':
case 'a':
case 's':
*formatp = *flags;
break;
}
flags++;
}
}
void
parse_size_flag (const char *flags, unsigned int *sizep)
{
while (*flags)
{
switch (*flags++)
{
case 'b':
*sizep = 1;
break;
case 'w':
*sizep = 2;
break;
}
}
}
char *
match_binary (char *expr, const char *op, char **secondp)
{
char *p;
p = strstr (expr, op);
if (!p)
return NULL;
*p = '\0';
p += strlen (op);
*secondp = p;
return expr;
}
int
fold_comparisons (char *expr, unsigned long *value)
{
char *p;
if (match_binary (expr, "==", &p))
*value = (eval (expr) == eval (p));
else if (match_binary (expr, "!=", &p))
*value = (eval (expr) != eval (p));
else
return 0;
return 1;
}
int
fold_binary (char *expr, const char op, unsigned long *valp)
{
char *p;
unsigned long val1, val2;
if ((p = strchr (expr, op)) == NULL)
return 0;
/* If the operator is the first character of the expression,
* then it's really a unary and shouldn't match here. */
if (p == expr)
return 0;
*p++ = '\0';
val1 = eval (expr);
val2 = eval (p);
switch (op)
{
case '+': *valp = val1 + val2; break;
case '-': *valp = val1 - val2; break;
case '*': *valp = val1 * val2; break;
case '/': *valp = val1 / val2; break;
}
return 1;
}
/**
* Evaluate a memory expression, as an lvalue or rvalue.
*/
unsigned long
eval_mem (char *expr, eval_mode_t mode)
{
char *p;
unsigned long val;
/* First evaluate the address */
if ((p = strchr (expr, ':')) != NULL)
{
*p++ = '\0';
val = MAKE_ADDR (eval (expr), eval (p));
}
else if (isalpha (*expr))
{
if (sym_find (&program_symtab, expr, &val, 0))
val = 0;
}
else
{
/* TODO - if expr is already in absolute form,
this explodes ! */
val = to_absolute (eval (expr));
}
/* If mode is RVALUE, then dereference it */
if (mode == RVALUE)
val = target_read (val, 1);
return val;
}
/**
* Evaluate an expression, given as a string.
* The return is the value (rvalue) of the expression.
*
* TODO:
* - Support typecasts ( {TYPE}ADDR )
*
*/
unsigned long
eval (char *expr)
{
char *p;
unsigned long val;
if (fold_comparisons (expr, &val));
else if ((p = strchr (expr, '=')) != NULL)
{
*p++ = '\0';
val = eval (p);
eval_assign (expr, val);
}
else if (fold_binary (expr, '+', &val));
else if (fold_binary (expr, '-', &val));
else if (fold_binary (expr, '*', &val));
else if (fold_binary (expr, '/', &val));
else if (*expr == '$')
{
if (expr[1] == '$')
val = eval_historical (history_count - strtoul (expr+2, NULL, 10));
else if (isdigit (expr[1]))
val = eval_historical (strtoul (expr+1, NULL, 10));
else if (!expr[1])
val = eval_historical (0);
else
val = eval_virtual (expr+1);
}
else if (*expr == '&')
{
val = eval_mem (expr+1, LVALUE);
}
else if (isalpha (*expr))
{
val = eval_mem (expr, RVALUE);
}
else
{
val = strtoul (expr, NULL, 0);
}
return val;
}
void brk_enable (breakpoint_t *br, int flag)
{
if (br->enabled != flag)
{
br->enabled = flag;
if (flag)
active_break_count++;
else
active_break_count--;
}
}
breakpoint_t *
brkalloc (void)
{
unsigned int n;
for (n = 0; n < MAX_BREAKS; n++)
if (!breaktab[n].used)
{
breakpoint_t *br = &breaktab[n];
br->used = 1;
br->id = n;
br->conditional = 0;
br->threaded = 0;
br->keep_running = 0;
br->ignore_count = 0;
br->temp = 0;
brk_enable (br, 1);
return br;
}
return NULL;
}
void
brkfree (breakpoint_t *br)
{
brk_enable (br, 0);
br->used = 0;
}
void
brkfree_temps (void)
{
unsigned int n;
for (n = 0; n < MAX_BREAKS; n++)
if (breaktab[n].used && breaktab[n].temp)
{
brkfree (&breaktab[n]);
}
}
breakpoint_t *
brkfind_by_addr (absolute_address_t addr)
{
unsigned int n;
for (n = 0; n < MAX_BREAKS; n++)
if (breaktab[n].addr == addr)
return &breaktab[n];
return NULL;
}
breakpoint_t *
brkfind_by_id (unsigned int id)
{
return &breaktab[id];
}
void
brkprint (breakpoint_t *brkpt)
{
if (!brkpt->used)
return;
if (brkpt->on_execute)
printf ("Breakpoint");
else
{
printf ("Watchpoint");
if (brkpt->on_read)
printf ("(%s)", brkpt->on_write ? "RW" : "RO");
}
printf (" %d at ", brkpt->id);
print_addr (brkpt->addr);
if (!brkpt->enabled)
printf (" (disabled)");
if (brkpt->conditional)
printf (" if %s", brkpt->condition);
if (brkpt->threaded)
printf (" on thread %d", brkpt->tid);
if (brkpt->keep_running)
printf (", print-only");
if (brkpt->temp)
printf (", temp");
if (brkpt->ignore_count)
printf (", ignore %d times\n", brkpt->ignore_count);
if (brkpt->write_mask)
printf (", mask %02X\n", brkpt->write_mask);
putchar ('\n');
}
display_t *
display_alloc (void)
{
unsigned int n;
for (n = 0; n < MAX_DISPLAYS; n++)
{
display_t *ds = &displaytab[n];
if (!ds->used)
{
ds->used = 1;
return ds;
}
}
}
void
display_free (display_t *ds)
{
}
void
print_value (unsigned long val, datatype_t *typep)
{
char f[8];
switch (typep->format)
{
case 'a':
print_addr (val);
return;
case 's':
{
absolute_address_t addr = (absolute_address_t)val;
char c;
putchar ('"');
while ((c = abs_read8 (addr++)) != '\0')
putchar (c);
putchar ('"');
return;
}
case 't':
/* TODO : print as binary integer */
break;
}
if (typep->format == 'x')
{
printf ("0x");
sprintf (f, "%%0%d%c", typep->size * 2, typep->format);
}
else if (typep->format == 'o')
{
printf ("0");
sprintf (f, "%%%c", typep->format);
}
else
sprintf (f, "%%%c", typep->format);
printf (f, val);
}
void
display_print (void)
{
unsigned int n;
char comma = '\0';
for (n = 0; n < MAX_DISPLAYS; n++)
{
display_t *ds = &displaytab[n];
if (ds->used)
{
char expr[256];
strcpy (expr, ds->expr);
printf ("%c %s = ", comma, expr);
print_value (eval (expr), &ds->type);
comma = ',';
}
}
if (comma)
putchar ('\n');
}
int
print_insn (absolute_address_t addr)
{
char buf[64];
int size = dasm (buf, addr);
printf ("%s", buf);
return size;
}
void
do_examine (void)
{
unsigned int n;
unsigned int objs_per_line = 16;
if (isdigit (*command_flags))
examine_repeat = strtoul (command_flags, &command_flags, 0);
if (*command_flags == 'i')
examine_type.format = *command_flags;
else
parse_format_flag (command_flags, &examine_type.format);
parse_size_flag (command_flags, &examine_type.size);
switch (examine_type.format)
{
case 'i':
objs_per_line = 1;
break;
case 'w':
objs_per_line = 8;
break;
}
for (n = 0; n < examine_repeat; n++)
{
if ((n % objs_per_line) == 0)
{
putchar ('\n');
print_addr (examine_addr);
printf (": ");
}
switch (examine_type.format)
{
case 's': /* string */
break;
case 'i': /* instruction */
examine_addr += print_insn (examine_addr);
break;
default:
print_value (target_read (examine_addr, examine_type.size),
&examine_type);
putchar (' ');
examine_addr += examine_type.size;
}
}
putchar ('\n');
}
void
do_print (char *expr)
{
unsigned long val = eval (expr);
printf ("$%d = ", history_count);
parse_format_flag (command_flags, &print_type.format);
parse_size_flag (command_flags, &print_type.size);
print_value (val, &print_type);
putchar ('\n');
save_value (val);
}
void
do_set (char *expr)
{
(void)eval (expr);
}
/* TODO - WPC */
#define THREAD_DATA_PC 3
#define THREAD_DATA_ROMBANK 9
void
print_thread_data (absolute_address_t th)
{
U8 b;
U16 w;
absolute_address_t pc;
w = abs_read16 (th + THREAD_DATA_PC);
b = abs_read8 (th + THREAD_DATA_ROMBANK);
if (w >= 0x8000)
pc = 0xF0000 + w;
else
pc = (b * 0x4000) + (w - 0x4000);
pc = MAKE_ADDR (1, pc);
print_addr (pc);
//printf ("{ <%04X,%02X>", w, b);
}
void
command_change_thread (void)
{
target_addr_t addr = target_read (thread_current, thread_id_size);
absolute_address_t th = to_absolute (addr);
if (th == thread_id)
return;
thread_id = th;
if (machine->dump_thread && eval ("$thread_debug"))
{
if (addr)
{
printf ("[Current thread = ");
print_addr (thread_id);
machine->dump_thread (thread_id);
print_thread_data (thread_id);
printf ("]\n");
}
else
{
printf ("[ No thread ]\n");
}
}
}
void
command_stack_push (unsigned int reason)
{
cmdqueue_t *q = &command_stack[++command_stack_depth];
}
void
command_stack_pop (void)
{
cmdqueue_t *q = &command_stack[command_stack_depth];
--command_stack_depth;
}
void
command_stack_add (const char *cmd)
{
cmdqueue_t *q = &command_stack[command_stack_depth];
}
char *
getarg (void)
{
return strtok (NULL, " \t\n");
}
/****************** Command Handlers ************************/
void cmd_print (void)
{
char *arg = getarg ();
if (arg)
do_print (arg);
else
do_print ("$");
}
void cmd_set (void)
{
char *arg = getarg ();
if (!strcmp (arg, "var"))
arg = getarg ();
if (arg)
do_set (arg);
else
do_set ("$");
}
void cmd_examine (void)
{
char *arg = getarg ();
if (arg)
examine_addr = eval_mem (arg, LVALUE);
do_examine ();
}
void cmd_break (void)
{
char *arg = getarg ();
if (!arg)
return;
unsigned long val = eval_mem (arg, LVALUE);
breakpoint_t *br = brkalloc ();
br->addr = val;
br->on_execute = 1;
arg = getarg ();
if (!arg);
else if (!strcmp (arg, "if"))
{
br->conditional = 1;
arg = getarg ();
strcpy (br->condition, arg);
}
else if (!strcmp (arg, "ignore"))
{
br->ignore_count = atoi (getarg ());
}
brkprint (br);
}
void cmd_watch1 (int on_read, int on_write)
{
char *arg;
arg = getarg ();
if (!arg)
return;
absolute_address_t addr = eval_mem (arg, LVALUE);
breakpoint_t *br = brkalloc ();
br->addr = addr;
br->on_read = on_read;
br->on_write = on_write;
for (;;)
{
arg = getarg ();
if (!arg)
return;
if (!strcmp (arg, "print"))
br->keep_running = 1;
else if (!strcmp (arg, "mask"))
{
arg = getarg ();
br->write_mask = strtoul (arg, NULL, 0);
}
else if (!strcmp (arg, "if"))
{
arg = getarg ();
br->conditional = 1;
strcpy (br->condition, arg);
}
}
brkprint (br);
}
void cmd_watch (void)
{
cmd_watch1 (0, 1);
}
void cmd_rwatch (void)
{
cmd_watch1 (1, 0);
}
void cmd_awatch (void)
{
cmd_watch1 (1, 1);
}
void cmd_break_list (void)
{
unsigned int n;
for (n = 0; n < MAX_BREAKS; n++)
brkprint (&breaktab[n]);
}
void cmd_step (void)
{
auto_break_insn_count = 1;
exit_command_loop = 0;
}
void cmd_next (void)
{
char buf[128];
breakpoint_t *br;
unsigned long addr = to_absolute (get_pc ());
addr += dasm (buf, addr);
br = brkalloc ();
br->addr = addr;
br->on_execute = 1;
br->temp = 1;
/* TODO - for conditional branches, should also set a
temp breakpoint at the branch target */
exit_command_loop = 0;
}
void cmd_continue (void)
{
exit_command_loop = 0;
}
void cmd_quit (void)
{
cpu_quit = 0;
exit_command_loop = 1;
}
void cmd_delete (void)
{
const char *arg = getarg ();
unsigned int id;
if (!arg)
{
int n;
printf ("Deleting all breakpoints.\n");
for (id = 0; id < MAX_BREAKS; id++)
{
breakpoint_t *br = brkfind_by_id (id);
brkfree (br);
}
return;
}
id = atoi (arg);
breakpoint_t *br = brkfind_by_id (id);
if (br->used)
{
printf ("Deleting breakpoint %d\n", id);
brkfree (br);
}
}
void cmd_list (void)
{
char *arg;
static absolute_address_t lastpc = 0;
static absolute_address_t lastaddr = 0;
absolute_address_t addr;
int n;
arg = getarg ();
if (arg)
addr = eval_mem (arg, LVALUE);
else
{
addr = to_absolute (get_pc ());
if (addr == lastpc)
addr = lastaddr;
else
lastaddr = lastpc = addr;
}
for (n = 0; n < 10; n++)
{
print_addr (addr);
printf (" : ");
addr += print_insn (addr);
putchar ('\n');
}
lastaddr = addr;
}
void cmd_symbol_file (void)
{
char *arg = getarg ();
if (arg)
load_map_file (arg);
}
void cmd_display (void)
{
char *arg;
while ((arg = getarg ()) != NULL)
{
display_t *ds = display_alloc ();
strcpy (ds->expr, arg);
ds->type = print_type;
parse_format_flag (command_flags, &ds->type.format);
parse_size_flag (command_flags, &ds->type.size);
}
}
int command_exec_file (const char *filename)
{
FILE *infile;
extern int command_exec (FILE *);
infile = file_open (NULL, filename, "r");
if (!infile)