1 /* Native debugging support for Intel x86 running DJGPP.
2 Copyright 1997, 1999 Free Software Foundation, Inc.
3 Written by Robert Hoehne.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
24 #include "frame.h" /* required by inferior.h */
30 #include "floatformat.h"
35 #include <debug/v2load.h>
36 #include <debug/dbgcom.h>
38 extern void _initialize_go32_nat (void);
42 unsigned short control
;
44 unsigned short status
;
49 unsigned short code_seg
;
50 unsigned short opcode
;
51 unsigned long operand
;
52 unsigned short operand_seg
;
54 unsigned char regs
[8][10];
57 extern char **environ
;
61 /* FIXME add decls of all static functions here */
63 static int prog_has_started
= 0;
66 print_387_status (unsigned short status
, struct env387
*ep
)
73 bothstatus
= ((status
!= 0) && (ep
->status
!= 0));
77 printf_unfiltered ("u: ");
78 print_387_status_word (status
);
84 printf_unfiltered ("e: ");
85 print_387_status_word (ep
->status
);
88 print_387_control_word (ep
->control
& 0xffff);
89 printf_unfiltered ("last exception: ");
90 printf_unfiltered ("opcode %s; ", local_hex_string (ep
->opcode
));
91 printf_unfiltered ("pc %s:", local_hex_string (ep
->code_seg
));
92 printf_unfiltered ("%s; ", local_hex_string (ep
->eip
));
93 printf_unfiltered ("operand %s", local_hex_string (ep
->operand_seg
));
94 printf_unfiltered (":%s\n", local_hex_string (ep
->operand
));
96 top
= (ep
->status
>> 11) & 7;
98 printf_unfiltered ("regno tag msb lsb value\n");
99 for (fpreg
= 0; fpreg
< 8; fpreg
++)
103 printf_unfiltered ("%s %d: ", fpreg
== top
? "=>" : " ", fpreg
);
105 switch ((ep
->tag
>> (fpreg
* 2)) & 3)
108 printf_unfiltered ("valid ");
111 printf_unfiltered ("zero ");
114 printf_unfiltered ("trap ");
117 printf_unfiltered ("empty ");
120 for (i
= 0; i
< 8; i
++)
121 printf_unfiltered ("%02x", ep
->regs
[fpreg
][i
]);
123 REGISTER_CONVERT_TO_VIRTUAL (FP0_REGNUM
+ fpreg
, builtin_type_long_double
,
124 &ep
->regs
[fpreg
], &val
);
126 printf_unfiltered (" %LG\n", val
);
131 i386_go32_float_info (void)
133 print_387_status (0, (struct env387
*) &npx
);
136 #define r_ofs(x) ((int)(&(((TSS *)0)->x)))
154 r_ofs (tss_eflags
), 4,
185 0, TARGET_SIGNAL_FPE
,
186 1, TARGET_SIGNAL_TRAP
,
187 2, TARGET_SIGNAL_UNKNOWN
,
188 3, TARGET_SIGNAL_TRAP
,
189 4, TARGET_SIGNAL_FPE
,
190 5, TARGET_SIGNAL_SEGV
,
191 6, TARGET_SIGNAL_ILL
,
192 7, TARGET_SIGNAL_FPE
,
193 8, TARGET_SIGNAL_SEGV
,
194 9, TARGET_SIGNAL_SEGV
,
195 10, TARGET_SIGNAL_BUS
,
196 11, TARGET_SIGNAL_SEGV
,
197 12, TARGET_SIGNAL_SEGV
,
198 13, TARGET_SIGNAL_ABRT
,
199 14, TARGET_SIGNAL_SEGV
,
200 16, TARGET_SIGNAL_FPE
,
201 31, TARGET_SIGNAL_ILL
,
202 0x75, TARGET_SIGNAL_FPE
,
203 0x79, TARGET_SIGNAL_INT
,
204 0x1b, TARGET_SIGNAL_INT
,
209 go32_open (char *name
, int from_tty
)
211 printf_unfiltered ("Use the `run' command to run go32 programs\n");
215 go32_close (int quitting
)
220 go32_attach (char *args
, int from_tty
)
222 printf_unfiltered ("Use the `run' command to run go32 programs\n");
226 go32_detach (char *args
, int from_tty
)
230 static int resume_is_step
;
233 go32_resume (int pid
, int step
, enum target_signal siggnal
)
235 resume_is_step
= step
;
239 go32_wait (int pid
, struct target_waitstatus
*status
)
244 a_tss
.tss_eflags
|= 0x0100;
246 a_tss
.tss_eflags
&= 0xfeff;
250 if (a_tss
.tss_irqn
== 0x21)
252 status
->kind
= TARGET_WAITKIND_EXITED
;
253 status
->value
.integer
= a_tss
.tss_eax
& 0xff;
257 status
->value
.sig
= TARGET_SIGNAL_UNKNOWN
;
258 status
->kind
= TARGET_WAITKIND_STOPPED
;
259 for (i
= 0; sig_map
[i
].go32_sig
!= -1; i
++)
261 if (a_tss
.tss_irqn
== sig_map
[i
].go32_sig
)
263 if ((status
->value
.sig
= sig_map
[i
].gdb_sig
) !=
265 status
->kind
= TARGET_WAITKIND_SIGNALLED
;
274 go32_fetch_registers (int regno
)
277 int end_reg
= regno
+ 1; /* just one reg initially */
279 if (regno
< 0) /* do the all registers */
281 regno
= 0; /* start at first register */
282 /* # regs in table */
283 end_reg
= sizeof (regno_mapping
) / sizeof (regno_mapping
[0]);
286 for (; regno
< end_reg
; regno
++)
289 supply_register (regno
,
290 (char *) &a_tss
+ regno_mapping
[regno
].tss_ofs
);
292 supply_register (regno
,
293 (char *) &npx
.reg
[regno_mapping
[regno
].tss_ofs
]);
295 supply_register (regno
,
296 (char *) &npx
.reg
+ regno_mapping
[regno
].tss_ofs
);
299 printf_unfiltered ("Invalid register in go32_fetch_register(%d)",
307 store_register (int regno
)
310 void *v
= (void *) ®isters
[REGISTER_BYTE (regno
)];
313 rp
= (char *) &a_tss
+ regno_mapping
[regno
].tss_ofs
;
315 rp
= (char *) &npx
.reg
[regno_mapping
[regno
].tss_ofs
];
317 rp
= (char *) &npx
+ regno_mapping
[regno
].tss_ofs
;
320 printf_unfiltered ("Invalid register in store_register(%d)", regno
);
323 memcpy (rp
, v
, regno_mapping
[regno
].size
);
327 go32_store_registers (int regno
)
332 store_register (regno
);
335 for (r
= 0; r
< sizeof (regno_mapping
) / sizeof (regno_mapping
[0]); r
++)
341 go32_prepare_to_store (void)
346 go32_xfer_memory (CORE_ADDR memaddr
, char *myaddr
, int len
, int write
,
347 struct target_ops
*target
)
351 if (write_child (memaddr
, myaddr
, len
))
362 if (read_child (memaddr
, myaddr
, len
))
374 go32_files_info (struct target_ops
*target
)
376 printf_unfiltered ("You are running a DJGPP V2 program\n");
385 prog_has_started
= 0;
389 go32_kill_inferior (void)
392 unpush_target (&go32_ops
);
396 go32_create_inferior (char *exec_file
, char *args
, char **env
)
400 char **env_save
= environ
;
402 if (prog_has_started
)
404 go32_kill_inferior ();
407 cmdline
= (char *) alloca (strlen (args
) + 4);
408 cmdline
[0] = strlen (args
);
409 strcpy (cmdline
+ 1, args
);
410 cmdline
[strlen (args
) + 1] = 13;
414 if (v2loadimage (exec_file
, cmdline
, start_state
))
417 printf_unfiltered ("Load failed for image %s\n", exec_file
);
422 edi_init (start_state
);
424 inferior_pid
= SOME_PID
;
425 push_target (&go32_ops
);
426 clear_proceed_status ();
427 insert_breakpoints ();
428 proceed ((CORE_ADDR
) - 1, TARGET_SIGNAL_0
, 0);
432 go32_mourn_inferior (void)
434 go32_kill_inferior ();
435 generic_mourn_inferior ();
450 ignore2 (char *a
, int b
)
454 /* Hardware watchpoint support. */
458 #define DR_ENABLE_SIZE 2
459 #define DR_LOCAL_ENABLE_SHIFT 0
460 #define DR_GLOBAL_ENABLE_SHIFT 1
461 #define DR_LOCAL_SLOWDOWN 0x100
462 #define DR_GLOBAL_SLOWDOWN 0x200
463 #define DR_CONTROL_SHIFT 16
464 #define DR_CONTROL_SIZE 4
465 #define DR_RW_READ 0x3
466 #define DR_RW_WRITE 0x1
467 #define DR_CONTROL_MASK 0xf
468 #define DR_ENABLE_MASK 0x3
473 #define D_REGS edi.dr
474 #define CONTROL D_REGS[DR_CONTROL]
475 #define STATUS D_REGS[DR_STATUS]
477 #define IS_REG_FREE(index) \
478 (!(CONTROL & (3 << (DR_ENABLE_SIZE * index))))
480 #define LOCAL_ENABLE_REG(index) \
481 (CONTROL |= (1 << (DR_LOCAL_ENABLE_SHIFT + DR_ENABLE_SIZE * index)))
483 #define GLOBAL_ENABLE_REG(index) \
484 (CONTROL |= (1 << (DR_GLOBAL_ENABLE_SHIFT + DR_ENABLE_SIZE * index)))
486 #define DISABLE_REG(index) \
487 (CONTROL &= ~(3 << (DR_ENABLE_SIZE * index)))
489 #define SET_LOCAL_EXACT() \
490 (CONTROL |= DR_LOCAL_SLOWDOWN)
492 #define SET_GLOBAL_EXACT() \
493 (CONTROL |= DR_GLOBAL_SLOWDOWN)
495 #define SET_BREAK(index,address) \
497 CONTROL &= ~(DR_CONTROL_MASK << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * index));\
498 D_REGS[index] = address;\
501 #define SET_WATCH(index,address,rw,len) \
503 SET_BREAK(index,address);\
504 CONTROL |= (len | rw) << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * index);\
507 #define WATCH_HIT(index) \
509 (STATUS & (1 << index)) && \
510 (CONTROL & (DR_CONTROL_MASK << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * index)))\
513 #if 0 /* use debugging macro */
514 #define SHOW_DR(text) \
516 fprintf(stderr,"%08x %08x ",edi.dr[7],edi.dr[6]); \
517 fprintf(stderr,"%08x %08x ",edi.dr[0],edi.dr[1]); \
518 fprintf(stderr,"%08x %08x ",edi.dr[2],edi.dr[3]); \
519 fprintf(stderr,"(%s)\n",#text); \
522 #define SHOW_DR(text) do {} while (0)
525 static int go32_insert_aligned_watchpoint (int pid
, CORE_ADDR waddr
,
526 CORE_ADDR addr
, int len
, int rw
);
528 static int go32_insert_nonaligned_watchpoint (int pid
, CORE_ADDR waddr
,
529 CORE_ADDR addr
, int len
, int rw
);
531 /* Insert a watchpoint. */
534 go32_insert_watchpoint (int pid
, CORE_ADDR addr
, int len
, int rw
)
536 int ret
= go32_insert_aligned_watchpoint (pid
, addr
, addr
, len
, rw
);
538 SHOW_DR (insert_watch
);
543 go32_insert_aligned_watchpoint (int pid
, CORE_ADDR waddr
, CORE_ADDR addr
,
547 int read_write_bits
, len_bits
;
549 /* Look for a free debug register. */
550 for (i
= 0; i
<= 3; i
++)
556 /* No more debug registers! */
560 read_write_bits
= ((rw
& 1) ? DR_RW_READ
: 0) | ((rw
& 2) ? DR_RW_WRITE
: 0);
567 return go32_insert_nonaligned_watchpoint (pid
, waddr
, addr
, len
, rw
);
573 return go32_insert_nonaligned_watchpoint (pid
, waddr
, addr
, len
, rw
);
577 return go32_insert_nonaligned_watchpoint (pid
, waddr
, addr
, len
, rw
);
579 SET_WATCH (i
, addr
, read_write_bits
, len_bits
);
580 LOCAL_ENABLE_REG (i
);
585 go32_insert_nonaligned_watchpoint (int pid
, CORE_ADDR waddr
, CORE_ADDR addr
,
592 static int size_try_array
[16] =
594 1, 1, 1, 1, /* trying size one */
595 2, 1, 2, 1, /* trying size two */
596 2, 1, 2, 1, /* trying size three */
597 4, 1, 2, 1 /* trying size four */
603 /* Four is the maximum length for 386. */
604 size
= (len
> 4) ? 3 : len
- 1;
605 size
= size_try_array
[size
* 4 + align
];
606 rv
= go32_insert_aligned_watchpoint (pid
, waddr
, addr
, size
, rw
);
609 go32_remove_watchpoint (pid
, waddr
, size
);
618 /* Remove a watchpoint. */
621 go32_remove_watchpoint (int pid
, CORE_ADDR addr
, int len
)
625 for (i
= 0; i
<= 3; i
++)
627 if (D_REGS
[i
] == addr
)
632 SHOW_DR (remove_watch
);
637 /* Check if stopped by a watchpoint. */
640 go32_stopped_by_watchpoint (int pid
)
645 status
= edi
.dr
[DR_STATUS
];
646 SHOW_DR (stopped_by
);
647 for (i
= 0; i
<= 3; i
++)
655 /* this is a hack to GDB. If we stopped at a hardware breakpoint,
656 the stop_pc must incremented by DECR_PC_AFTER_BREAK. I tried everything
657 with the DECR_PC_AFTER_HW_BREAK, but nothing works. */
658 /* This is probably fixed by jtc's recent patch -sts 2/19/99 */
660 stop_pc
+= DECR_PC_AFTER_BREAK
;
666 /* Remove a breakpoint. */
669 go32_remove_hw_breakpoint (CORE_ADDR addr
, CORE_ADDR shadow
)
672 for (i
= 0; i
<= 3; i
++)
674 if (D_REGS
[i
] == addr
)
684 go32_insert_hw_breakpoint (CORE_ADDR addr
, CORE_ADDR shadow
)
687 int read_write_bits
, len_bits
;
688 int free_debug_register
;
691 /* Look for a free debug register. */
692 for (i
= 0; i
<= 3; i
++)
698 /* No more debug registers! */
703 LOCAL_ENABLE_REG (i
);
709 static struct target_ops go32_ops
;
714 go32_ops
.to_shortname
= "djgpp";
715 go32_ops
.to_longname
= "djgpp target process";
717 "Program loaded by djgpp, when gdb is used as an external debugger";
718 go32_ops
.to_open
= go32_open
;
719 go32_ops
.to_close
= go32_close
;
720 go32_ops
.to_detach
= go32_detach
;
721 go32_ops
.to_resume
= go32_resume
;
722 go32_ops
.to_wait
= go32_wait
;
723 go32_ops
.to_fetch_registers
= go32_fetch_registers
;
724 go32_ops
.to_store_registers
= go32_store_registers
;
725 go32_ops
.to_prepare_to_store
= go32_prepare_to_store
;
726 go32_ops
.to_xfer_memory
= go32_xfer_memory
;
727 go32_ops
.to_files_info
= go32_files_info
;
728 go32_ops
.to_insert_breakpoint
= memory_insert_breakpoint
;
729 go32_ops
.to_remove_breakpoint
= memory_remove_breakpoint
;
730 go32_ops
.to_terminal_init
= ignore
;
731 go32_ops
.to_terminal_inferior
= ignore
;
732 go32_ops
.to_terminal_ours_for_output
= ignore
;
733 go32_ops
.to_terminal_ours
= ignore
;
734 go32_ops
.to_terminal_info
= ignore2
;
735 go32_ops
.to_kill
= go32_kill_inferior
;
736 go32_ops
.to_create_inferior
= go32_create_inferior
;
737 go32_ops
.to_mourn_inferior
= go32_mourn_inferior
;
738 go32_ops
.to_can_run
= go32_can_run
;
739 go32_ops
.to_stop
= go32_stop
;
740 go32_ops
.to_stratum
= process_stratum
;
741 go32_ops
.to_has_all_memory
= 1;
742 go32_ops
.to_has_memory
= 1;
743 go32_ops
.to_has_stack
= 1;
744 go32_ops
.to_has_registers
= 1;
745 go32_ops
.to_has_execution
= 1;
746 go32_ops
.to_magic
= OPS_MAGIC
;
750 _initialize_go32_nat (void)
753 add_target (&go32_ops
);