1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright 1995, 1996, 1998, 1999, 2000, 2001, 2002
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. */
26 #include <sys/param.h>
28 #include <sys/ptrace.h>
31 #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 #define PTRACE_ARG3_TYPE long
45 #define PTRACE_XFER_TYPE int
49 static void initialize_arch (void);
51 /* Start an inferior process and returns its pid.
52 ALLARGS is a vector of program-name and args. */
55 create_inferior (char *program
, char **allargs
)
61 perror_with_name ("fork");
65 ptrace (PTRACE_TRACEME
, 0, 0, 0);
67 execv (program
, allargs
);
69 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
78 /* Attach to an inferior process. */
83 if (ptrace (PTRACE_ATTACH
, pid
, 0, 0) != 0)
85 fprintf (stderr
, "Cannot attach to process %d: %s (%d)\n", pid
,
86 errno
< sys_nerr
? sys_errlist
[errno
] : "unknown error",
95 /* Kill the inferior process. Make us have no inferior. */
100 if (inferior_pid
== 0)
102 ptrace (PTRACE_KILL
, inferior_pid
, 0, 0);
106 /* Return nonzero if the given thread is still alive. */
108 mythread_alive (int pid
)
113 /* Wait for process, returns status */
116 mywait (char *status
)
122 pid
= waitpid (inferior_pid
, &w
, 0);
124 if (pid
!= inferior_pid
)
125 perror_with_name ("wait");
129 fprintf (stderr
, "\nChild exited with retcode = %x \n", WEXITSTATUS (w
));
131 return ((unsigned char) WEXITSTATUS (w
));
133 else if (!WIFSTOPPED (w
))
135 fprintf (stderr
, "\nChild terminated with signal = %x \n", WTERMSIG (w
));
137 return ((unsigned char) WTERMSIG (w
));
140 fetch_inferior_registers (0);
143 return ((unsigned char) WSTOPSIG (w
));
146 /* Resume execution of the inferior process.
147 If STEP is nonzero, single-step it.
148 If SIGNAL is nonzero, give it that signal. */
151 myresume (int step
, int signal
)
154 ptrace (step
? PTRACE_SINGLESTEP
: PTRACE_CONT
, inferior_pid
, 1, signal
);
156 perror_with_name ("ptrace");
160 #if !defined (offsetof)
161 #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
164 /* U_REGS_OFFSET is the offset of the registers within the u area. */
165 #if !defined (U_REGS_OFFSET)
166 #define U_REGS_OFFSET \
167 ptrace (PT_READ_U, inferior_pid, \
168 (PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0) \
172 #ifdef I386_GNULINUX_TARGET
173 /* This module only supports access to the general purpose registers.
174 Adjust the relevant constants accordingly.
176 FIXME: kettenis/2001-03-28: We should really use PTRACE_GETREGS to
177 get at the registers. Better yet, we should try to share code with
182 #define NUM_REGS NUM_GREGS
184 /* This stuff comes from i386-tdep.c. */
186 /* i386_register_byte[i] is the offset into the register file of the
187 start of register number i. We initialize this from
188 i386_register_raw_size. */
189 int i386_register_byte
[MAX_NUM_REGS
];
191 /* i386_register_raw_size[i] is the number of bytes of storage in
192 GDB's register array occupied by register i. */
193 int i386_register_raw_size
[MAX_NUM_REGS
] = {
208 initialize_arch (void)
210 /* Initialize the table saying where each register starts in the
216 for (i
= 0; i
< MAX_NUM_REGS
; i
++)
218 i386_register_byte
[i
] = offset
;
219 offset
+= i386_register_raw_size
[i
];
224 /* This stuff comes from i386-linux-nat.c. */
226 /* Mapping between the general-purpose registers in `struct user'
227 format and GDB's register array layout. */
228 static int regmap
[] =
236 /* Return the address of register REGNUM. BLOCKEND is the value of
237 u.u_ar0, which should point to the registers. */
240 register_u_addr (CORE_ADDR blockend
, int regnum
)
242 return (blockend
+ 4 * regmap
[regnum
]);
244 #elif defined(TARGET_M68K)
246 initialize_arch (void)
251 /* This table must line up with REGISTER_NAMES in tm-m68k.h */
252 static int regmap
[] =
255 PT_D0
, PT_D1
, PT_D2
, PT_D3
, PT_D4
, PT_D5
, PT_D6
, PT_D7
,
256 PT_A0
, PT_A1
, PT_A2
, PT_A3
, PT_A4
, PT_A5
, PT_A6
, PT_USP
,
259 14, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15,
263 PT_FP0
, PT_FP1
, PT_FP2
, PT_FP3
, PT_FP4
, PT_FP5
, PT_FP6
, PT_FP7
,
264 PT_FPCR
, PT_FPSR
, PT_FPIAR
266 21, 24, 27, 30, 33, 36, 39, 42, 45, 46, 47
270 /* BLOCKEND is the value of u.u_ar0, and points to the place where GS
274 m68k_linux_register_u_addr (int blockend
, int regnum
)
276 return (blockend
+ 4 * regmap
[regnum
]);
278 #elif defined(IA64_GNULINUX_TARGET)
282 #include <asm/ptrace_offsets.h>
284 static int u_offsets
[] =
286 /* general registers */
287 -1, /* gr0 not available; i.e, it's always zero */
319 /* gr32 through gr127 not directly available via the ptrace interface */
320 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
321 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
322 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
323 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
324 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
325 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
326 /* Floating point registers */
327 -1, -1, /* f0 and f1 not available (f0 is +0.0 and f1 is +1.0) */
454 /* predicate registers - we don't fetch these individually */
455 -1, -1, -1, -1, -1, -1, -1, -1,
456 -1, -1, -1, -1, -1, -1, -1, -1,
457 -1, -1, -1, -1, -1, -1, -1, -1,
458 -1, -1, -1, -1, -1, -1, -1, -1,
459 -1, -1, -1, -1, -1, -1, -1, -1,
460 -1, -1, -1, -1, -1, -1, -1, -1,
461 -1, -1, -1, -1, -1, -1, -1, -1,
462 -1, -1, -1, -1, -1, -1, -1, -1,
463 /* branch registers */
472 /* virtual frame pointer and virtual return address pointer */
474 /* other registers */
477 PT_CR_IPSR
, /* psr */
479 /* kernel registers not visible via ptrace interface (?) */
480 -1, -1, -1, -1, -1, -1, -1, -1,
482 -1, -1, -1, -1, -1, -1, -1, -1,
488 -1, /* Not available: FCR, IA32 floating control register */
490 -1, /* Not available: EFLAG */
491 -1, /* Not available: CSD */
492 -1, /* Not available: SSD */
493 -1, /* Not available: CFLG */
494 -1, /* Not available: FSR */
495 -1, /* Not available: FIR */
496 -1, /* Not available: FDR */
504 -1, /* Not available: ITC */
505 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
506 -1, -1, -1, -1, -1, -1, -1, -1, -1,
509 -1, /* Not available: EC, the Epilog Count register */
510 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
511 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
512 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
513 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
514 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
515 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
517 /* nat bits - not fetched directly; instead we obtain these bits from
518 either rnat or unat or from memory. */
519 -1, -1, -1, -1, -1, -1, -1, -1,
520 -1, -1, -1, -1, -1, -1, -1, -1,
521 -1, -1, -1, -1, -1, -1, -1, -1,
522 -1, -1, -1, -1, -1, -1, -1, -1,
523 -1, -1, -1, -1, -1, -1, -1, -1,
524 -1, -1, -1, -1, -1, -1, -1, -1,
525 -1, -1, -1, -1, -1, -1, -1, -1,
526 -1, -1, -1, -1, -1, -1, -1, -1,
527 -1, -1, -1, -1, -1, -1, -1, -1,
528 -1, -1, -1, -1, -1, -1, -1, -1,
529 -1, -1, -1, -1, -1, -1, -1, -1,
530 -1, -1, -1, -1, -1, -1, -1, -1,
531 -1, -1, -1, -1, -1, -1, -1, -1,
532 -1, -1, -1, -1, -1, -1, -1, -1,
533 -1, -1, -1, -1, -1, -1, -1, -1,
534 -1, -1, -1, -1, -1, -1, -1, -1,
538 ia64_register_u_addr (int blockend
, int regnum
)
542 if (regnum
< 0 || regnum
>= NUM_REGS
)
543 error ("Invalid register number %d.", regnum
);
545 addr
= u_offsets
[regnum
];
553 initialize_arch (void)
558 #elif defined(ARM_GNULINUX_TARGET)
559 int arm_register_u_addr(blockend
, regnum
)
563 return blockend
+ REGISTER_BYTE(regnum
);
573 register_addr (int regno
, CORE_ADDR blockend
)
577 if (regno
< 0 || regno
>= NUM_REGS
)
578 error ("Invalid register number %d.", regno
);
580 REGISTER_U_ADDR (addr
, blockend
, regno
);
585 /* Fetch one register. */
588 fetch_register (int regno
)
593 /* Offset of registers within the u area. */
596 offset
= U_REGS_OFFSET
;
598 regaddr
= register_addr (regno
, offset
);
599 for (i
= 0; i
< REGISTER_RAW_SIZE (regno
); i
+= sizeof (PTRACE_XFER_TYPE
))
602 *(PTRACE_XFER_TYPE
*) ®isters
[REGISTER_BYTE (regno
) + i
] =
603 ptrace (PTRACE_PEEKUSER
, inferior_pid
, (PTRACE_ARG3_TYPE
) regaddr
, 0);
604 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
607 /* Warning, not error, in case we are attached; sometimes the
608 kernel doesn't let us at the registers. */
609 char *err
= strerror (errno
);
610 char *msg
= alloca (strlen (err
) + 128);
611 sprintf (msg
, "reading register %d: %s", regno
, err
);
619 /* Fetch all registers, or just one, from the child process. */
622 fetch_inferior_registers (int regno
)
624 if (regno
== -1 || regno
== 0)
625 for (regno
= 0; regno
< NUM_REGS
- NUM_FREGS
; regno
++)
626 fetch_register (regno
);
628 fetch_register (regno
);
631 /* Store our register values back into the inferior.
632 If REGNO is -1, do this for all registers.
633 Otherwise, REGNO specifies which register (so we can save time). */
636 store_inferior_registers (int regno
)
640 unsigned int offset
= U_REGS_OFFSET
;
645 if (CANNOT_STORE_REGISTER (regno
))
648 regaddr
= register_addr (regno
, offset
);
651 if (regno
== PCOQ_HEAD_REGNUM
|| regno
== PCOQ_TAIL_REGNUM
)
653 scratch
= *(int *) ®isters
[REGISTER_BYTE (regno
)] | 0x3;
654 ptrace (PT_WUREGS
, inferior_pid
, (PTRACE_ARG3_TYPE
) regaddr
,
658 /* Error, even if attached. Failing to write these two
659 registers is pretty serious. */
660 sprintf (buf
, "writing register number %d", regno
);
661 perror_with_name (buf
);
666 for (i
= 0; i
< REGISTER_RAW_SIZE (regno
); i
+= sizeof (int))
669 ptrace (PTRACE_POKEUSER
, inferior_pid
, (PTRACE_ARG3_TYPE
) regaddr
,
670 *(int *) ®isters
[REGISTER_BYTE (regno
) + i
]);
673 /* Warning, not error, in case we are attached; sometimes the
674 kernel doesn't let us at the registers. */
675 char *err
= strerror (errno
);
676 char *msg
= alloca (strlen (err
) + 128);
677 sprintf (msg
, "writing register %d: %s",
682 regaddr
+= sizeof (int);
686 for (regno
= 0; regno
< NUM_REGS
- NUM_FREGS
; regno
++)
687 store_inferior_registers (regno
);
690 /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
691 in the NEW_SUN_PTRACE case.
692 It ought to be straightforward. But it appears that writing did
693 not write the data that I specified. I cannot understand where
694 it got the data that it actually did write. */
696 /* Copy LEN bytes from inferior's memory starting at MEMADDR
697 to debugger memory starting at MYADDR. */
700 read_inferior_memory (CORE_ADDR memaddr
, char *myaddr
, int len
)
703 /* Round starting address down to longword boundary. */
704 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
705 /* Round ending address up; get number of longwords that makes. */
707 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
708 / sizeof (PTRACE_XFER_TYPE
);
709 /* Allocate buffer of that many longwords. */
710 register PTRACE_XFER_TYPE
*buffer
711 = (PTRACE_XFER_TYPE
*) alloca (count
* sizeof (PTRACE_XFER_TYPE
));
713 /* Read all the longwords */
714 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
716 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, inferior_pid
, (PTRACE_ARG3_TYPE
) addr
, 0);
719 /* Copy appropriate bytes out of the buffer. */
720 memcpy (myaddr
, (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)), len
);
723 /* Copy LEN bytes of data from debugger memory at MYADDR
724 to inferior's memory at MEMADDR.
725 On failure (cannot write the inferior)
726 returns the value of errno. */
729 write_inferior_memory (CORE_ADDR memaddr
, char *myaddr
, int len
)
732 /* Round starting address down to longword boundary. */
733 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
734 /* Round ending address up; get number of longwords that makes. */
736 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1) / sizeof (PTRACE_XFER_TYPE
);
737 /* Allocate buffer of that many longwords. */
738 register PTRACE_XFER_TYPE
*buffer
= (PTRACE_XFER_TYPE
*) alloca (count
* sizeof (PTRACE_XFER_TYPE
));
741 /* Fill start and end extra bytes of buffer with existing memory data. */
743 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, inferior_pid
,
744 (PTRACE_ARG3_TYPE
) addr
, 0);
749 = ptrace (PTRACE_PEEKTEXT
, inferior_pid
,
750 (PTRACE_ARG3_TYPE
) (addr
+ (count
- 1)
751 * sizeof (PTRACE_XFER_TYPE
)),
755 /* Copy data to be written over corresponding part of buffer */
757 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)), myaddr
, len
);
759 /* Write the entire buffer. */
761 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
764 ptrace (PTRACE_POKETEXT
, inferior_pid
, (PTRACE_ARG3_TYPE
) addr
, buffer
[i
]);
773 initialize_low (void)
This page took 0.04685 seconds and 4 git commands to generate.