1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright 1995, 1996, 1998, 1999, 2000, 2001
3 Free Software Foundation, Inc.
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,
20 Boston, MA 02111-1307, USA. */
28 #include <sys/param.h>
30 #include <sys/ptrace.h>
33 #include <sys/ioctl.h>
36 /***************Begin MY defs*********************/
37 static char my_registers
[REGISTER_BYTES
];
38 char *registers
= my_registers
;
39 /***************End MY defs*********************/
45 /* Default the type of the ptrace transfer to int. */
46 #ifndef PTRACE_XFER_TYPE
47 #define PTRACE_XFER_TYPE int
52 static void initialize_arch (void);
54 /* Start an inferior process and returns its pid.
55 ALLARGS is a vector of program-name and args. */
58 create_inferior (char *program
, char **allargs
)
64 perror_with_name ("fork");
68 ptrace (PTRACE_TRACEME
, 0, 0, 0);
70 execv (program
, allargs
);
72 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
73 errno
< sys_nerr
? sys_errlist
[errno
] : "unknown error");
81 /* Kill the inferior process. Make us have no inferior. */
86 if (inferior_pid
== 0)
88 ptrace (PTRACE_KILL
, inferior_pid
, 0, 0);
90 /*************inferior_died ();****VK**************/
93 /* Return nonzero if the given thread is still alive. */
95 mythread_alive (int pid
)
100 /* Wait for process, returns status */
103 mywait (char *status
)
109 if (pid
!= inferior_pid
)
110 perror_with_name ("wait");
114 fprintf (stderr
, "\nChild exited with retcode = %x \n", WEXITSTATUS (w
));
116 return ((unsigned char) WEXITSTATUS (w
));
118 else if (!WIFSTOPPED (w
))
120 fprintf (stderr
, "\nChild terminated with signal = %x \n", WTERMSIG (w
));
122 return ((unsigned char) WTERMSIG (w
));
125 fetch_inferior_registers (0);
128 return ((unsigned char) WSTOPSIG (w
));
131 /* Resume execution of the inferior process.
132 If STEP is nonzero, single-step it.
133 If SIGNAL is nonzero, give it that signal. */
136 myresume (int step
, int signal
)
139 ptrace (step
? PTRACE_SINGLESTEP
: PTRACE_CONT
, inferior_pid
, 1, signal
);
141 perror_with_name ("ptrace");
145 #if !defined (offsetof)
146 #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
149 /* U_REGS_OFFSET is the offset of the registers within the u area. */
150 #if !defined (U_REGS_OFFSET)
151 #define U_REGS_OFFSET \
152 ptrace (PT_READ_U, inferior_pid, \
153 (PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0) \
157 #ifdef I386_GNULINUX_TARGET
158 /* i386_register_raw_size[i] is the number of bytes of storage in the
159 actual machine representation for register i. */
160 int i386_register_raw_size
[MAX_NUM_REGS
] = {
174 int i386_register_byte
[MAX_NUM_REGS
];
177 initialize_arch (void)
179 /* Initialize the table saying where each register starts in the
185 for (i
= 0; i
< MAX_NUM_REGS
; i
++)
187 i386_register_byte
[i
] = offset
;
188 offset
+= i386_register_raw_size
[i
];
193 /* this table must line up with REGISTER_NAMES in tm-i386v.h */
194 /* symbols like 'EAX' come from <sys/reg.h> */
195 static int regmap
[] =
204 i386_register_u_addr (int blockend
, int regnum
)
207 /* this will be needed if fp registers are reinstated */
208 /* for now, you can look at them with 'info float'
209 * sys5 wont let you change them with ptrace anyway
211 if (regnum
>= FP0_REGNUM
&& regnum
<= FP7_REGNUM
)
215 ubase
= blockend
+ 4 * (SS
+ 1) - KSTKSZ
;
216 fpstate
= ubase
+ ((char *) &u
.u_fpstate
- (char *) &u
);
217 return (fpstate
+ 0x1c + 10 * (regnum
- FP0_REGNUM
));
221 return (blockend
+ 4 * regmap
[regnum
]);
224 #elif defined(TARGET_M68K)
226 initialize_arch (void)
231 /* This table must line up with REGISTER_NAMES in tm-m68k.h */
232 static int regmap
[] =
235 PT_D0
, PT_D1
, PT_D2
, PT_D3
, PT_D4
, PT_D5
, PT_D6
, PT_D7
,
236 PT_A0
, PT_A1
, PT_A2
, PT_A3
, PT_A4
, PT_A5
, PT_A6
, PT_USP
,
239 14, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15,
243 PT_FP0
, PT_FP1
, PT_FP2
, PT_FP3
, PT_FP4
, PT_FP5
, PT_FP6
, PT_FP7
,
244 PT_FPCR
, PT_FPSR
, PT_FPIAR
246 21, 24, 27, 30, 33, 36, 39, 42, 45, 46, 47
250 /* BLOCKEND is the value of u.u_ar0, and points to the place where GS
254 m68k_linux_register_u_addr (int blockend
, int regnum
)
256 return (blockend
+ 4 * regmap
[regnum
]);
258 #elif defined(IA64_GNULINUX_TARGET)
262 #include <asm/ptrace_offsets.h>
264 static int u_offsets
[] =
266 /* general registers */
267 -1, /* gr0 not available; i.e, it's always zero */
299 /* gr32 through gr127 not directly available via the ptrace interface */
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 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
306 /* Floating point registers */
307 -1, -1, /* f0 and f1 not available (f0 is +0.0 and f1 is +1.0) */
434 /* predicate registers - we don't fetch these individually */
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 -1, -1, -1, -1, -1, -1, -1, -1,
443 /* branch registers */
452 /* virtual frame pointer and virtual return address pointer */
454 /* other registers */
457 PT_CR_IPSR
, /* psr */
459 /* kernel registers not visible via ptrace interface (?) */
460 -1, -1, -1, -1, -1, -1, -1, -1,
462 -1, -1, -1, -1, -1, -1, -1, -1,
468 -1, /* Not available: FCR, IA32 floating control register */
470 -1, /* Not available: EFLAG */
471 -1, /* Not available: CSD */
472 -1, /* Not available: SSD */
473 -1, /* Not available: CFLG */
474 -1, /* Not available: FSR */
475 -1, /* Not available: FIR */
476 -1, /* Not available: FDR */
484 -1, /* Not available: ITC */
485 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
486 -1, -1, -1, -1, -1, -1, -1, -1, -1,
489 -1, /* Not available: EC, the Epilog Count register */
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,
495 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
497 /* nat bits - not fetched directly; instead we obtain these bits from
498 either rnat or unat or from memory. */
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,
514 -1, -1, -1, -1, -1, -1, -1, -1,
518 ia64_register_u_addr (int blockend
, int regnum
)
522 if (regnum
< 0 || regnum
>= NUM_REGS
)
523 error ("Invalid register number %d.", regnum
);
525 addr
= u_offsets
[regnum
];
533 initialize_arch (void)
540 register_addr (int regno
, CORE_ADDR blockend
)
544 if (regno
< 0 || regno
>= NUM_REGS
)
545 error ("Invalid register number %d.", regno
);
547 REGISTER_U_ADDR (addr
, blockend
, regno
);
552 /* Fetch one register. */
555 fetch_register (int regno
)
560 /* Offset of registers within the u area. */
563 offset
= U_REGS_OFFSET
;
565 regaddr
= register_addr (regno
, offset
);
566 for (i
= 0; i
< REGISTER_RAW_SIZE (regno
); i
+= sizeof (PTRACE_XFER_TYPE
))
569 *(PTRACE_XFER_TYPE
*) ®isters
[REGISTER_BYTE (regno
) + i
] =
570 ptrace (PTRACE_PEEKUSER
, inferior_pid
, (PTRACE_ARG3_TYPE
) regaddr
, 0);
571 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
574 /* Warning, not error, in case we are attached; sometimes the
575 kernel doesn't let us at the registers. */
576 char *err
= strerror (errno
);
577 char *msg
= alloca (strlen (err
) + 128);
578 sprintf (msg
, "reading register %d: %s", regno
, err
);
586 /* Fetch all registers, or just one, from the child process. */
589 fetch_inferior_registers (int regno
)
591 if (regno
== -1 || regno
== 0)
592 for (regno
= 0; regno
< NUM_REGS
- NUM_FREGS
; regno
++)
593 fetch_register (regno
);
595 fetch_register (regno
);
598 /* Store our register values back into the inferior.
599 If REGNO is -1, do this for all registers.
600 Otherwise, REGNO specifies which register (so we can save time). */
603 store_inferior_registers (int regno
)
607 unsigned int offset
= U_REGS_OFFSET
;
612 if (CANNOT_STORE_REGISTER (regno
))
615 regaddr
= register_addr (regno
, offset
);
618 if (regno
== PCOQ_HEAD_REGNUM
|| regno
== PCOQ_TAIL_REGNUM
)
620 scratch
= *(int *) ®isters
[REGISTER_BYTE (regno
)] | 0x3;
621 ptrace (PT_WUREGS
, inferior_pid
, (PTRACE_ARG3_TYPE
) regaddr
,
625 /* Error, even if attached. Failing to write these two
626 registers is pretty serious. */
627 sprintf (buf
, "writing register number %d", regno
);
628 perror_with_name (buf
);
633 for (i
= 0; i
< REGISTER_RAW_SIZE (regno
); i
+= sizeof (int))
636 ptrace (PTRACE_POKEUSER
, inferior_pid
, (PTRACE_ARG3_TYPE
) regaddr
,
637 *(int *) ®isters
[REGISTER_BYTE (regno
) + i
]);
640 /* Warning, not error, in case we are attached; sometimes the
641 kernel doesn't let us at the registers. */
642 char *err
= strerror (errno
);
643 char *msg
= alloca (strlen (err
) + 128);
644 sprintf (msg
, "writing register %d: %s",
649 regaddr
+= sizeof (int);
653 for (regno
= 0; regno
< NUM_REGS
- NUM_FREGS
; regno
++)
654 store_inferior_registers (regno
);
657 /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
658 in the NEW_SUN_PTRACE case.
659 It ought to be straightforward. But it appears that writing did
660 not write the data that I specified. I cannot understand where
661 it got the data that it actually did write. */
663 /* Copy LEN bytes from inferior's memory starting at MEMADDR
664 to debugger memory starting at MYADDR. */
667 read_inferior_memory (CORE_ADDR memaddr
, char *myaddr
, int len
)
670 /* Round starting address down to longword boundary. */
671 register CORE_ADDR addr
= memaddr
& -sizeof (PTRACE_XFER_TYPE
);
672 /* Round ending address up; get number of longwords that makes. */
674 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
675 / sizeof (PTRACE_XFER_TYPE
);
676 /* Allocate buffer of that many longwords. */
677 register PTRACE_XFER_TYPE
*buffer
678 = (PTRACE_XFER_TYPE
*) alloca (count
* sizeof (PTRACE_XFER_TYPE
));
680 /* Read all the longwords */
681 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
683 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, inferior_pid
, addr
, 0);
686 /* Copy appropriate bytes out of the buffer. */
687 memcpy (myaddr
, (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)), len
);
690 /* Copy LEN bytes of data from debugger memory at MYADDR
691 to inferior's memory at MEMADDR.
692 On failure (cannot write the inferior)
693 returns the value of errno. */
696 write_inferior_memory (CORE_ADDR memaddr
, char *myaddr
, int len
)
699 /* Round starting address down to longword boundary. */
700 register CORE_ADDR addr
= memaddr
& -sizeof (PTRACE_XFER_TYPE
);
701 /* Round ending address up; get number of longwords that makes. */
703 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1) / sizeof (PTRACE_XFER_TYPE
);
704 /* Allocate buffer of that many longwords. */
705 register PTRACE_XFER_TYPE
*buffer
= (PTRACE_XFER_TYPE
*) alloca (count
* sizeof (PTRACE_XFER_TYPE
));
708 /* Fill start and end extra bytes of buffer with existing memory data. */
710 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, inferior_pid
, addr
, 0);
715 = ptrace (PTRACE_PEEKTEXT
, inferior_pid
,
716 addr
+ (count
- 1) * sizeof (PTRACE_XFER_TYPE
), 0);
719 /* Copy data to be written over corresponding part of buffer */
721 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)), myaddr
, len
);
723 /* Write the entire buffer. */
725 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
728 ptrace (PTRACE_POKETEXT
, inferior_pid
, addr
, buffer
[i
]);
737 initialize_low (void)