gdb/alpha-nat.c - third_party/binutils-gdb - Git at Google

 /* Low level Alpha interface, for GDB when running native.
    Copyright 1993, 1995, 1996, 1998 Free Software Foundation, Inc.

    This file is part of GDB.

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place - Suite 330,
    Boston, MA 02111-1307, USA.  */

 #include "defs.h"
 #include "inferior.h"
 #include "gdbcore.h"
 #include "target.h"
 #include <sys/ptrace.h>
 #ifdef __linux__
 #include <asm/reg.h>
 #include <alpha/ptrace.h>
 #else
 #include <machine/reg.h>
 #endif
 #include <sys/user.h>

 /* Prototypes for local functions. */

 static void fetch_osf_core_registers (char *, unsigned, int, CORE_ADDR);
 static void fetch_elf_core_registers (char *, unsigned, int, CORE_ADDR);

 /* Size of elements in jmpbuf */

 #define JB_ELEMENT_SIZE 8

 /* The definition for JB_PC in machine/reg.h is wrong.
    And we can't get at the correct definition in setjmp.h as it is
    not always available (eg. if _POSIX_SOURCE is defined which is the
    default). As the defintion is unlikely to change (see comment
    in <setjmp.h>, define the correct value here.  */

 #undef JB_PC
 #define JB_PC 2

 /* Figure out where the longjmp will land.
    We expect the first arg to be a pointer to the jmp_buf structure from which
    we extract the pc (JB_PC) that we will land at.  The pc is copied into PC.
    This routine returns true on success. */

 int
 get_longjmp_target (pc)
      CORE_ADDR *pc;
 {
   CORE_ADDR jb_addr;
   char raw_buffer[MAX_REGISTER_RAW_SIZE];

   jb_addr = read_register (A0_REGNUM);

   if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, raw_buffer,
 			  sizeof (CORE_ADDR)))
     return 0;

   *pc = extract_address (raw_buffer, sizeof (CORE_ADDR));
   return 1;
 }

 /* Extract the register values out of the core file and store
    them where `read_register' will find them.

    CORE_REG_SECT points to the register values themselves, read into memory.
    CORE_REG_SIZE is the size of that area.
    WHICH says which set of registers we are handling (0 = int, 2 = float
    on machines where they are discontiguous).
    REG_ADDR is the offset from u.u_ar0 to the register values relative to
    core_reg_sect.  This is used with old-fashioned core files to
    locate the registers in a large upage-plus-stack ".reg" section.
    Original upage address X is at location core_reg_sect+x+reg_addr.
  */

 static void
 fetch_osf_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
      char *core_reg_sect;
      unsigned core_reg_size;
      int which;
      CORE_ADDR reg_addr;
 {
   register int regno;
   register int addr;
   int bad_reg = -1;

   /* Table to map a gdb regnum to an index in the core register section.
      The floating point register values are garbage in OSF/1.2 core files.  */
   static int core_reg_mapping[NUM_REGS] =
   {
 #define EFL (EF_SIZE / 8)
     EF_V0, EF_T0, EF_T1, EF_T2, EF_T3, EF_T4, EF_T5, EF_T6,
     EF_T7, EF_S0, EF_S1, EF_S2, EF_S3, EF_S4, EF_S5, EF_S6,
     EF_A0, EF_A1, EF_A2, EF_A3, EF_A4, EF_A5, EF_T8, EF_T9,
     EF_T10, EF_T11, EF_RA, EF_T12, EF_AT, EF_GP, EF_SP, -1,
     EFL + 0, EFL + 1, EFL + 2, EFL + 3, EFL + 4, EFL + 5, EFL + 6, EFL + 7,
     EFL + 8, EFL + 9, EFL + 10, EFL + 11, EFL + 12, EFL + 13, EFL + 14, EFL + 15,
     EFL + 16, EFL + 17, EFL + 18, EFL + 19, EFL + 20, EFL + 21, EFL + 22, EFL + 23,
     EFL + 24, EFL + 25, EFL + 26, EFL + 27, EFL + 28, EFL + 29, EFL + 30, EFL + 31,
     EF_PC, -1
   };
   static char zerobuf[MAX_REGISTER_RAW_SIZE] =
   {0};

   for (regno = 0; regno < NUM_REGS; regno++)
     {
       if (CANNOT_FETCH_REGISTER (regno))
 	{
 	  supply_register (regno, zerobuf);
 	  continue;
 	}
       addr = 8 * core_reg_mapping[regno];
       if (addr < 0 || addr >= core_reg_size)
 	{
 	  if (bad_reg < 0)
 	    bad_reg = regno;
 	}
       else
 	{
 	  supply_register (regno, core_reg_sect + addr);
 	}
     }
   if (bad_reg >= 0)
     {
       error ("Register %s not found in core file.", REGISTER_NAME (bad_reg));
     }
 }

 static void
 fetch_elf_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
      char *core_reg_sect;
      unsigned core_reg_size;
      int which;
      CORE_ADDR reg_addr;
 {
   if (core_reg_size < 32 * 8)
     {
       error ("Core file register section too small (%u bytes).", core_reg_size);
       return;
     }

   if (which == 2)
     {
       /* The FPU Registers.  */
       memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)], core_reg_sect, 31 * 8);
       memset (&registers[REGISTER_BYTE (FP0_REGNUM + 31)], 0, 8);
       memset (&register_valid[FP0_REGNUM], 1, 32);
     }
   else
     {
       /* The General Registers.  */
       memcpy (&registers[REGISTER_BYTE (V0_REGNUM)], core_reg_sect, 31 * 8);
       memcpy (&registers[REGISTER_BYTE (PC_REGNUM)], core_reg_sect + 31 * 8, 8);
       memset (&registers[REGISTER_BYTE (ZERO_REGNUM)], 0, 8);
       memset (&register_valid[V0_REGNUM], 1, 32);
       register_valid[PC_REGNUM] = 1;
     }
 }


 /* Map gdb internal register number to a ptrace ``address''.
    These ``addresses'' are defined in <sys/ptrace.h> */

 #define REGISTER_PTRACE_ADDR(regno) \
    (regno < FP0_REGNUM ? 	GPR_BASE + (regno) \
   : regno == PC_REGNUM ?	PC	\
   : regno >= FP0_REGNUM ?	FPR_BASE + ((regno) - FP0_REGNUM) \
   : 0)

 /* Return the ptrace ``address'' of register REGNO. */

 CORE_ADDR
 register_addr (regno, blockend)
      int regno;
      CORE_ADDR blockend;
 {
   return REGISTER_PTRACE_ADDR (regno);
 }

 int
 kernel_u_size ()
 {
   return (sizeof (struct user));
 }

 #if defined(USE_PROC_FS) || defined(HAVE_GREGSET_T)
 #include <sys/procfs.h>

 /* Prototypes for supply_gregset etc. */
 #include "gregset.h"

 /*
  * See the comment in m68k-tdep.c regarding the utility of these functions.
  */

 void
 supply_gregset (gregsetp)
      gregset_t *gregsetp;
 {
   register int regi;
   register long *regp = ALPHA_REGSET_BASE (gregsetp);
   static char zerobuf[MAX_REGISTER_RAW_SIZE] =
   {0};

   for (regi = 0; regi < 31; regi++)
     supply_register (regi, (char *) (regp + regi));

   supply_register (PC_REGNUM, (char *) (regp + 31));

   /* Fill inaccessible registers with zero.  */
   supply_register (ZERO_REGNUM, zerobuf);
   supply_register (FP_REGNUM, zerobuf);
 }

 void
 fill_gregset (gregsetp, regno)
      gregset_t *gregsetp;
      int regno;
 {
   int regi;
   register long *regp = ALPHA_REGSET_BASE (gregsetp);

   for (regi = 0; regi < 31; regi++)
     if ((regno == -1) || (regno == regi))
       *(regp + regi) = *(long *) &registers[REGISTER_BYTE (regi)];

   if ((regno == -1) || (regno == PC_REGNUM))
     *(regp + 31) = *(long *) &registers[REGISTER_BYTE (PC_REGNUM)];
 }

 /*
  * Now we do the same thing for floating-point registers.
  * Again, see the comments in m68k-tdep.c.
  */

 void
 supply_fpregset (fpregsetp)
      fpregset_t *fpregsetp;
 {
   register int regi;
   register long *regp = ALPHA_REGSET_BASE (fpregsetp);

   for (regi = 0; regi < 32; regi++)
     supply_register (regi + FP0_REGNUM, (char *) (regp + regi));
 }

 void
 fill_fpregset (fpregsetp, regno)
      fpregset_t *fpregsetp;
      int regno;
 {
   int regi;
   register long *regp = ALPHA_REGSET_BASE (fpregsetp);

   for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++)
     {
       if ((regno == -1) || (regno == regi))
 	{
 	  *(regp + regi - FP0_REGNUM) =
 	    *(long *) &registers[REGISTER_BYTE (regi)];
 	}
     }
 }
 #endif


 /* Register that we are able to handle alpha core file formats. */

 static struct core_fns alpha_osf_core_fns =
 {
   /* This really is bfd_target_unknown_flavour.  */

   bfd_target_unknown_flavour,		/* core_flavour */
   default_check_format,			/* check_format */
   default_core_sniffer,			/* core_sniffer */
   fetch_osf_core_registers,		/* core_read_registers */
   NULL					/* next */
 };

 static struct core_fns alpha_elf_core_fns =
 {
   bfd_target_elf_flavour,		/* core_flavour */
   default_check_format,			/* check_format */
   default_core_sniffer,			/* core_sniffer */
   fetch_elf_core_registers,		/* core_read_registers */
   NULL					/* next */
 };

 void
 _initialize_core_alpha ()
 {
   add_core_fns (&alpha_osf_core_fns);
   add_core_fns (&alpha_elf_core_fns);
 }
	/* Low level Alpha interface, for GDB when running native.
	Copyright 1993, 1995, 1996, 1998 Free Software Foundation, Inc.

	This file is part of GDB.

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the Free Software
	Foundation, Inc., 59 Temple Place - Suite 330,
	Boston, MA 02111-1307, USA. */

	#include "defs.h"
	#include "inferior.h"
	#include "gdbcore.h"
	#include "target.h"
	#include <sys/ptrace.h>
	#ifdef __linux__
	#include <asm/reg.h>
	#include <alpha/ptrace.h>
	#else
	#include <machine/reg.h>
	#endif
	#include <sys/user.h>

	/* Prototypes for local functions. */

	static void fetch_osf_core_registers (char *, unsigned, int, CORE_ADDR);
	static void fetch_elf_core_registers (char *, unsigned, int, CORE_ADDR);

	/* Size of elements in jmpbuf */

	#define JB_ELEMENT_SIZE 8

	/* The definition for JB_PC in machine/reg.h is wrong.
	And we can't get at the correct definition in setjmp.h as it is
	not always available (eg. if _POSIX_SOURCE is defined which is the
	default). As the defintion is unlikely to change (see comment
	in <setjmp.h>, define the correct value here. */

	#undef JB_PC
	#define JB_PC 2

	/* Figure out where the longjmp will land.
	We expect the first arg to be a pointer to the jmp_buf structure from which
	we extract the pc (JB_PC) that we will land at. The pc is copied into PC.
	This routine returns true on success. */

	int
	get_longjmp_target (pc)
	CORE_ADDR *pc;
	{
	CORE_ADDR jb_addr;
	char raw_buffer[MAX_REGISTER_RAW_SIZE];

	jb_addr = read_register (A0_REGNUM);

	if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, raw_buffer,
	sizeof (CORE_ADDR)))
	return 0;

	*pc = extract_address (raw_buffer, sizeof (CORE_ADDR));
	return 1;
	}

	/* Extract the register values out of the core file and store
	them where `read_register' will find them.

	CORE_REG_SECT points to the register values themselves, read into memory.
	CORE_REG_SIZE is the size of that area.
	WHICH says which set of registers we are handling (0 = int, 2 = float
	on machines where they are discontiguous).
	REG_ADDR is the offset from u.u_ar0 to the register values relative to
	core_reg_sect. This is used with old-fashioned core files to
	locate the registers in a large upage-plus-stack ".reg" section.
	Original upage address X is at location core_reg_sect+x+reg_addr.
	*/

	static void
	fetch_osf_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
	char *core_reg_sect;
	unsigned core_reg_size;
	int which;
	CORE_ADDR reg_addr;
	{
	register int regno;
	register int addr;
	int bad_reg = -1;

	/* Table to map a gdb regnum to an index in the core register section.
	The floating point register values are garbage in OSF/1.2 core files. */
	static int core_reg_mapping[NUM_REGS] =
	{
	#define EFL (EF_SIZE / 8)
	EF_V0, EF_T0, EF_T1, EF_T2, EF_T3, EF_T4, EF_T5, EF_T6,
	EF_T7, EF_S0, EF_S1, EF_S2, EF_S3, EF_S4, EF_S5, EF_S6,
	EF_A0, EF_A1, EF_A2, EF_A3, EF_A4, EF_A5, EF_T8, EF_T9,
	EF_T10, EF_T11, EF_RA, EF_T12, EF_AT, EF_GP, EF_SP, -1,
	EFL + 0, EFL + 1, EFL + 2, EFL + 3, EFL + 4, EFL + 5, EFL + 6, EFL + 7,
	EFL + 8, EFL + 9, EFL + 10, EFL + 11, EFL + 12, EFL + 13, EFL + 14, EFL + 15,
	EFL + 16, EFL + 17, EFL + 18, EFL + 19, EFL + 20, EFL + 21, EFL + 22, EFL + 23,
	EFL + 24, EFL + 25, EFL + 26, EFL + 27, EFL + 28, EFL + 29, EFL + 30, EFL + 31,
	EF_PC, -1
	};
	static char zerobuf[MAX_REGISTER_RAW_SIZE] =
	{0};

	for (regno = 0; regno < NUM_REGS; regno++)
	{
	if (CANNOT_FETCH_REGISTER (regno))
	{
	supply_register (regno, zerobuf);
	continue;
	}
	addr = 8 * core_reg_mapping[regno];
	if (addr < 0 \|\| addr >= core_reg_size)
	{
	if (bad_reg < 0)
	bad_reg = regno;
	}
	else
	{
	supply_register (regno, core_reg_sect + addr);
	}
	}
	if (bad_reg >= 0)
	{
	error ("Register %s not found in core file.", REGISTER_NAME (bad_reg));
	}
	}

	static void
	fetch_elf_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
	char *core_reg_sect;
	unsigned core_reg_size;
	int which;
	CORE_ADDR reg_addr;
	{
	if (core_reg_size < 32 * 8)
	{
	error ("Core file register section too small (%u bytes).", core_reg_size);
	return;
	}

	if (which == 2)
	{
	/* The FPU Registers. */
	memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)], core_reg_sect, 31 * 8);
	memset (&registers[REGISTER_BYTE (FP0_REGNUM + 31)], 0, 8);
	memset (&register_valid[FP0_REGNUM], 1, 32);
	}
	else
	{
	/* The General Registers. */
	memcpy (&registers[REGISTER_BYTE (V0_REGNUM)], core_reg_sect, 31 * 8);
	memcpy (&registers[REGISTER_BYTE (PC_REGNUM)], core_reg_sect + 31 * 8, 8);
	memset (&registers[REGISTER_BYTE (ZERO_REGNUM)], 0, 8);
	memset (&register_valid[V0_REGNUM], 1, 32);
	register_valid[PC_REGNUM] = 1;
	}
	}


	/* Map gdb internal register number to a ptrace ``address''.
	These ``addresses'' are defined in <sys/ptrace.h> */

	#define REGISTER_PTRACE_ADDR(regno) \
	(regno < FP0_REGNUM ? GPR_BASE + (regno) \
	: regno == PC_REGNUM ? PC \
	: regno >= FP0_REGNUM ? FPR_BASE + ((regno) - FP0_REGNUM) \
	: 0)

	/* Return the ptrace ``address'' of register REGNO. */

	CORE_ADDR
	register_addr (regno, blockend)
	int regno;
	CORE_ADDR blockend;
	{
	return REGISTER_PTRACE_ADDR (regno);
	}

	int
	kernel_u_size ()
	{
	return (sizeof (struct user));
	}

	#if defined(USE_PROC_FS) \|\| defined(HAVE_GREGSET_T)
	#include <sys/procfs.h>

	/* Prototypes for supply_gregset etc. */
	#include "gregset.h"

	/*
	* See the comment in m68k-tdep.c regarding the utility of these functions.
	*/

	void
	supply_gregset (gregsetp)
	gregset_t *gregsetp;
	{
	register int regi;
	register long *regp = ALPHA_REGSET_BASE (gregsetp);
	static char zerobuf[MAX_REGISTER_RAW_SIZE] =
	{0};

	for (regi = 0; regi < 31; regi++)
	supply_register (regi, (char *) (regp + regi));

	supply_register (PC_REGNUM, (char *) (regp + 31));

	/* Fill inaccessible registers with zero. */
	supply_register (ZERO_REGNUM, zerobuf);
	supply_register (FP_REGNUM, zerobuf);
	}

	void
	fill_gregset (gregsetp, regno)
	gregset_t *gregsetp;
	int regno;
	{
	int regi;
	register long *regp = ALPHA_REGSET_BASE (gregsetp);

	for (regi = 0; regi < 31; regi++)
	if ((regno == -1) \|\| (regno == regi))
	(regp + regi) = (long *) &registers[REGISTER_BYTE (regi)];

	if ((regno == -1) \|\| (regno == PC_REGNUM))
	(regp + 31) = (long *) &registers[REGISTER_BYTE (PC_REGNUM)];
	}

	/*
	* Now we do the same thing for floating-point registers.
	* Again, see the comments in m68k-tdep.c.
	*/

	void
	supply_fpregset (fpregsetp)
	fpregset_t *fpregsetp;
	{
	register int regi;
	register long *regp = ALPHA_REGSET_BASE (fpregsetp);

	for (regi = 0; regi < 32; regi++)
	supply_register (regi + FP0_REGNUM, (char *) (regp + regi));
	}

	void
	fill_fpregset (fpregsetp, regno)
	fpregset_t *fpregsetp;
	int regno;
	{
	int regi;
	register long *regp = ALPHA_REGSET_BASE (fpregsetp);

	for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++)
	{
	if ((regno == -1) \|\| (regno == regi))
	{
	*(regp + regi - FP0_REGNUM) =
	(long ) &registers[REGISTER_BYTE (regi)];
	}
	}
	}
	#endif


	/* Register that we are able to handle alpha core file formats. */

	static struct core_fns alpha_osf_core_fns =
	{
	/* This really is bfd_target_unknown_flavour. */

	bfd_target_unknown_flavour, /* core_flavour */
	default_check_format, /* check_format */
	default_core_sniffer, /* core_sniffer */
	fetch_osf_core_registers, /* core_read_registers */
	NULL /* next */
	};

	static struct core_fns alpha_elf_core_fns =
	{
	bfd_target_elf_flavour, /* core_flavour */
	default_check_format, /* check_format */
	default_core_sniffer, /* core_sniffer */
	fetch_elf_core_registers, /* core_read_registers */
	NULL /* next */
	};

	void
	_initialize_core_alpha ()
	{
	add_core_fns (&alpha_osf_core_fns);
	add_core_fns (&alpha_elf_core_fns);
	}