1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright (C) 1995, 1996 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
27 #include <sys/param.h>
29 #include <sys/ptrace.h>
32 #include <sys/ioctl.h>
35 /***************Begin MY defs*********************/
36 static char my_registers
[REGISTER_BYTES
];
37 char *registers
= my_registers
;
38 /***************End MY defs*********************/
44 /* Default the type of the ptrace transfer to int. */
45 #ifndef PTRACE_XFER_TYPE
46 #define PTRACE_XFER_TYPE int
51 static void initialize_arch (void);
53 /* Start an inferior process and returns its pid.
54 ALLARGS is a vector of program-name and args. */
57 create_inferior (char *program
, char **allargs
)
63 perror_with_name ("fork");
67 ptrace (PTRACE_TRACEME
, 0, 0, 0);
69 execv (program
, allargs
);
71 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
72 errno
< sys_nerr
? sys_errlist
[errno
] : "unknown error");
80 /* Kill the inferior process. Make us have no inferior. */
85 if (inferior_pid
== 0)
87 ptrace (PTRACE_KILL
, inferior_pid
, 0, 0);
89 /*************inferior_died ();****VK**************/
92 /* Return nonzero if the given thread is still alive. */
94 mythread_alive (int pid
)
99 /* Wait for process, returns status */
102 mywait (char *status
)
108 if (pid
!= inferior_pid
)
109 perror_with_name ("wait");
113 fprintf (stderr
, "\nChild exited with retcode = %x \n", WEXITSTATUS (w
));
115 return ((unsigned char) WEXITSTATUS (w
));
117 else if (!WIFSTOPPED (w
))
119 fprintf (stderr
, "\nChild terminated with signal = %x \n", WTERMSIG (w
));
121 return ((unsigned char) WTERMSIG (w
));
124 fetch_inferior_registers (0);
127 return ((unsigned char) WSTOPSIG (w
));
130 /* Resume execution of the inferior process.
131 If STEP is nonzero, single-step it.
132 If SIGNAL is nonzero, give it that signal. */
135 myresume (int step
, int signal
)
138 ptrace (step
? PTRACE_SINGLESTEP
: PTRACE_CONT
, inferior_pid
, 1, signal
);
140 perror_with_name ("ptrace");
144 #if !defined (offsetof)
145 #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
148 /* U_REGS_OFFSET is the offset of the registers within the u area. */
149 #if !defined (U_REGS_OFFSET)
150 #define U_REGS_OFFSET \
151 ptrace (PT_READ_U, inferior_pid, \
152 (PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0) \
156 #ifdef I386_GNULINUX_TARGET
157 /* i386_register_raw_size[i] is the number of bytes of storage in the
158 actual machine representation for register i. */
159 int i386_register_raw_size
[MAX_NUM_REGS
] = {
173 int i386_register_byte
[MAX_NUM_REGS
];
176 initialize_arch (void)
178 /* Initialize the table saying where each register starts in the
184 for (i
= 0; i
< MAX_NUM_REGS
; i
++)
186 i386_register_byte
[i
] = offset
;
187 offset
+= i386_register_raw_size
[i
];
192 /* this table must line up with REGISTER_NAMES in tm-i386v.h */
193 /* symbols like 'EAX' come from <sys/reg.h> */
194 static int regmap
[] =
203 i386_register_u_addr (int blockend
, int regnum
)
206 /* this will be needed if fp registers are reinstated */
207 /* for now, you can look at them with 'info float'
208 * sys5 wont let you change them with ptrace anyway
210 if (regnum
>= FP0_REGNUM
&& regnum
<= FP7_REGNUM
)
214 ubase
= blockend
+ 4 * (SS
+ 1) - KSTKSZ
;
215 fpstate
= ubase
+ ((char *) &u
.u_fpstate
- (char *) &u
);
216 return (fpstate
+ 0x1c + 10 * (regnum
- FP0_REGNUM
));
220 return (blockend
+ 4 * regmap
[regnum
]);
223 #elif defined(TARGET_M68K)
225 initialize_arch (void)
230 /* This table must line up with REGISTER_NAMES in tm-m68k.h */
231 static int regmap
[] =
234 PT_D0
, PT_D1
, PT_D2
, PT_D3
, PT_D4
, PT_D5
, PT_D6
, PT_D7
,
235 PT_A0
, PT_A1
, PT_A2
, PT_A3
, PT_A4
, PT_A5
, PT_A6
, PT_USP
,
238 14, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15,
242 PT_FP0
, PT_FP1
, PT_FP2
, PT_FP3
, PT_FP4
, PT_FP5
, PT_FP6
, PT_FP7
,
243 PT_FPCR
, PT_FPSR
, PT_FPIAR
245 21, 24, 27, 30, 33, 36, 39, 42, 45, 46, 47
249 /* BLOCKEND is the value of u.u_ar0, and points to the place where GS
253 m68k_linux_register_u_addr (int blockend
, int regnum
)
255 return (blockend
+ 4 * regmap
[regnum
]);
257 #elif defined(IA64_GNULINUX_TARGET)
261 #include <asm/ptrace_offsets.h>
263 static int u_offsets
[] =
265 /* general registers */
266 -1, /* gr0 not available; i.e, it's always zero */
298 /* gr32 through gr127 not directly available via the ptrace interface */
299 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
300 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
301 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
302 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
303 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
304 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
305 /* Floating point registers */
306 -1, -1, /* f0 and f1 not available (f0 is +0.0 and f1 is +1.0) */
433 /* predicate registers - we don't fetch these individually */
434 -1, -1, -1, -1, -1, -1, -1, -1,
435 -1, -1, -1, -1, -1, -1, -1, -1,
436 -1, -1, -1, -1, -1, -1, -1, -1,
437 -1, -1, -1, -1, -1, -1, -1, -1,
438 -1, -1, -1, -1, -1, -1, -1, -1,
439 -1, -1, -1, -1, -1, -1, -1, -1,
440 -1, -1, -1, -1, -1, -1, -1, -1,
441 -1, -1, -1, -1, -1, -1, -1, -1,
442 /* branch registers */
451 /* virtual frame pointer and virtual return address pointer */
453 /* other registers */
456 PT_CR_IPSR
, /* psr */
458 /* kernel registers not visible via ptrace interface (?) */
459 -1, -1, -1, -1, -1, -1, -1, -1,
461 -1, -1, -1, -1, -1, -1, -1, -1,
467 -1, /* Not available: FCR, IA32 floating control register */
469 -1, /* Not available: EFLAG */
470 -1, /* Not available: CSD */
471 -1, /* Not available: SSD */
472 -1, /* Not available: CFLG */
473 -1, /* Not available: FSR */
474 -1, /* Not available: FIR */
475 -1, /* Not available: FDR */
483 -1, /* Not available: ITC */
484 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
485 -1, -1, -1, -1, -1, -1, -1, -1, -1,
488 -1, /* Not available: EC, the Epilog Count register */
489 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
490 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
491 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
492 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
493 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
494 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
496 /* nat bits - not fetched directly; instead we obtain these bits from
497 either rnat or unat or from memory. */
498 -1, -1, -1, -1, -1, -1, -1, -1,
499 -1, -1, -1, -1, -1, -1, -1, -1,
500 -1, -1, -1, -1, -1, -1, -1, -1,
501 -1, -1, -1, -1, -1, -1, -1, -1,
502 -1, -1, -1, -1, -1, -1, -1, -1,
503 -1, -1, -1, -1, -1, -1, -1, -1,
504 -1, -1, -1, -1, -1, -1, -1, -1,
505 -1, -1, -1, -1, -1, -1, -1, -1,
506 -1, -1, -1, -1, -1, -1, -1, -1,
507 -1, -1, -1, -1, -1, -1, -1, -1,
508 -1, -1, -1, -1, -1, -1, -1, -1,
509 -1, -1, -1, -1, -1, -1, -1, -1,
510 -1, -1, -1, -1, -1, -1, -1, -1,
511 -1, -1, -1, -1, -1, -1, -1, -1,
512 -1, -1, -1, -1, -1, -1, -1, -1,
513 -1, -1, -1, -1, -1, -1, -1, -1,
517 ia64_register_u_addr (int blockend
, int regnum
)
521 if (regnum
< 0 || regnum
>= NUM_REGS
)
522 error ("Invalid register number %d.", regnum
);
524 addr
= u_offsets
[regnum
];
532 initialize_arch (void)
539 register_addr (int regno
, CORE_ADDR blockend
)
543 if (regno
< 0 || regno
>= ARCH_NUM_REGS
)
544 error ("Invalid register number %d.", regno
);
546 REGISTER_U_ADDR (addr
, blockend
, regno
);
551 /* Fetch one register. */
554 fetch_register (int regno
)
559 /* Offset of registers within the u area. */
562 offset
= U_REGS_OFFSET
;
564 regaddr
= register_addr (regno
, offset
);
565 for (i
= 0; i
< REGISTER_RAW_SIZE (regno
); i
+= sizeof (PTRACE_XFER_TYPE
))
568 *(PTRACE_XFER_TYPE
*) ®isters
[REGISTER_BYTE (regno
) + i
] =
569 ptrace (PTRACE_PEEKUSER
, inferior_pid
, (PTRACE_ARG3_TYPE
) regaddr
, 0);
570 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
573 /* Warning, not error, in case we are attached; sometimes the
574 kernel doesn't let us at the registers. */
575 char *err
= strerror (errno
);
576 char *msg
= alloca (strlen (err
) + 128);
577 sprintf (msg
, "reading register %d: %s", regno
, err
);
585 /* Fetch all registers, or just one, from the child process. */
588 fetch_inferior_registers (int regno
)
590 if (regno
== -1 || regno
== 0)
591 for (regno
= 0; regno
< NUM_REGS
- NUM_FREGS
; regno
++)
592 fetch_register (regno
);
594 fetch_register (regno
);
597 /* Store our register values back into the inferior.
598 If REGNO is -1, do this for all registers.
599 Otherwise, REGNO specifies which register (so we can save time). */
602 store_inferior_registers (int regno
)
606 unsigned int offset
= U_REGS_OFFSET
;
611 if (CANNOT_STORE_REGISTER (regno
))
614 regaddr
= register_addr (regno
, offset
);
617 if (regno
== PCOQ_HEAD_REGNUM
|| regno
== PCOQ_TAIL_REGNUM
)
619 scratch
= *(int *) ®isters
[REGISTER_BYTE (regno
)] | 0x3;
620 ptrace (PT_WUREGS
, inferior_pid
, (PTRACE_ARG3_TYPE
) regaddr
,
624 /* Error, even if attached. Failing to write these two
625 registers is pretty serious. */
626 sprintf (buf
, "writing register number %d", regno
);
627 perror_with_name (buf
);
632 for (i
= 0; i
< REGISTER_RAW_SIZE (regno
); i
+= sizeof (int))
635 ptrace (PTRACE_POKEUSER
, inferior_pid
, (PTRACE_ARG3_TYPE
) regaddr
,
636 *(int *) ®isters
[REGISTER_BYTE (regno
) + i
]);
639 /* Warning, not error, in case we are attached; sometimes the
640 kernel doesn't let us at the registers. */
641 char *err
= strerror (errno
);
642 char *msg
= alloca (strlen (err
) + 128);
643 sprintf (msg
, "writing register %d: %s",
648 regaddr
+= sizeof (int);
652 for (regno
= 0; regno
< NUM_REGS
- NUM_FREGS
; regno
++)
653 store_inferior_registers (regno
);
656 /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
657 in the NEW_SUN_PTRACE case.
658 It ought to be straightforward. But it appears that writing did
659 not write the data that I specified. I cannot understand where
660 it got the data that it actually did write. */
662 /* Copy LEN bytes from inferior's memory starting at MEMADDR
663 to debugger memory starting at MYADDR. */
666 read_inferior_memory (CORE_ADDR memaddr
, char *myaddr
, int len
)
669 /* Round starting address down to longword boundary. */
670 register CORE_ADDR addr
= memaddr
& -sizeof (PTRACE_XFER_TYPE
);
671 /* Round ending address up; get number of longwords that makes. */
673 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
674 / sizeof (PTRACE_XFER_TYPE
);
675 /* Allocate buffer of that many longwords. */
676 register PTRACE_XFER_TYPE
*buffer
677 = (PTRACE_XFER_TYPE
*) alloca (count
* sizeof (PTRACE_XFER_TYPE
));
679 /* Read all the longwords */
680 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
682 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, inferior_pid
, addr
, 0);
685 /* Copy appropriate bytes out of the buffer. */
686 memcpy (myaddr
, (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)), len
);
689 /* Copy LEN bytes of data from debugger memory at MYADDR
690 to inferior's memory at MEMADDR.
691 On failure (cannot write the inferior)
692 returns the value of errno. */
695 write_inferior_memory (CORE_ADDR memaddr
, char *myaddr
, int len
)
698 /* Round starting address down to longword boundary. */
699 register CORE_ADDR addr
= memaddr
& -sizeof (PTRACE_XFER_TYPE
);
700 /* Round ending address up; get number of longwords that makes. */
702 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1) / sizeof (PTRACE_XFER_TYPE
);
703 /* Allocate buffer of that many longwords. */
704 register PTRACE_XFER_TYPE
*buffer
= (PTRACE_XFER_TYPE
*) alloca (count
* sizeof (PTRACE_XFER_TYPE
));
707 /* Fill start and end extra bytes of buffer with existing memory data. */
709 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, inferior_pid
, addr
, 0);
714 = ptrace (PTRACE_PEEKTEXT
, inferior_pid
,
715 addr
+ (count
- 1) * sizeof (PTRACE_XFER_TYPE
), 0);
718 /* Copy data to be written over corresponding part of buffer */
720 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)), myaddr
, len
);
722 /* Write the entire buffer. */
724 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
727 ptrace (PTRACE_POKETEXT
, inferior_pid
, addr
, buffer
[i
]);
736 initialize_low (void)
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