[deliverable/binutils-gdb.git] / gdb / mips-nat.c

/* Low level DECstation interface to ptrace, for GDB when running native.
   Copyright 1988, 1989, 1991, 1992 Free Software Foundation, Inc.
   Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU
   and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin.

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., 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include "defs.h"
#include "inferior.h"
#include "gdbcore.h"
#include <sys/ptrace.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/user.h>
#undef JB_S0
#undef JB_S1
#undef JB_S2
#undef JB_S3
#undef JB_S4
#undef JB_S5
#undef JB_S6
#undef JB_S7
#undef JB_SP
#undef JB_S8
#undef JB_PC
#undef JB_SR
#undef NJBREGS
#include <setjmp.h>		/* For JB_XXX.  */

/* Size of elements in jmpbuf */

#define JB_ELEMENT_SIZE 4

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

#define REGISTER_PTRACE_ADDR(regno) \
   (regno < 32 ? 		GPR_BASE + regno \
  : regno == PC_REGNUM ?	PC	\
  : regno == CAUSE_REGNUM ?	CAUSE	\
  : regno == HI_REGNUM ?	MMHI	\
  : regno == LO_REGNUM ?	MMLO	\
  : regno == FCRCS_REGNUM ?	FPC_CSR	\
  : regno == FCRIR_REGNUM ?	FPC_EIR	\
  : regno >= FP0_REGNUM ?	FPR_BASE + (regno - FP0_REGNUM) \
  : 0)

static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0};

/* Get all registers from the inferior */

void
fetch_inferior_registers (regno)
     int regno;
{
  register unsigned int regaddr;
  char buf[MAX_REGISTER_RAW_SIZE];
  register int i;

  registers_fetched ();

  for (regno = 1; regno < NUM_REGS; regno++)
    {
      regaddr = REGISTER_PTRACE_ADDR (regno);
      for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
 	{
 	  *(int *) &buf[i] = ptrace (PT_READ_U, inferior_pid,
				     (PTRACE_ARG3_TYPE) regaddr, 0);
 	  regaddr += sizeof (int);
 	}
      supply_register (regno, buf);
    }

  supply_register (ZERO_REGNUM, zerobuf);
  /* Frame ptr reg must appear to be 0; it is faked by stack handling code. */
  supply_register (FP_REGNUM, zerobuf);
}

/* Store our register values back into the inferior.
   If REGNO is -1, do this for all registers.
   Otherwise, REGNO specifies which register (so we can save time).  */

void
store_inferior_registers (regno)
     int regno;
{
  register unsigned int regaddr;
  char buf[80];

  if (regno == 0)
    return;

  if (regno > 0)
    {
      regaddr = REGISTER_PTRACE_ADDR (regno);
      errno = 0;
      ptrace (PT_WRITE_U, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
	      read_register (regno));
      if (errno != 0)
	{
	  sprintf (buf, "writing register number %d", regno);
	  perror_with_name (buf);
	}
    }
  else
    {
      for (regno = 0; regno < NUM_REGS; regno++)
	{
	  if (regno == ZERO_REGNUM || regno == PS_REGNUM
	      || regno == BADVADDR_REGNUM || regno == CAUSE_REGNUM
	      || regno == FCRIR_REGNUM || regno == FP_REGNUM
	      || (regno >= FIRST_EMBED_REGNUM && regno <= LAST_EMBED_REGNUM))
	    continue;
	  regaddr = REGISTER_PTRACE_ADDR (regno);
	  errno = 0;
	  ptrace (6, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
		  read_register (regno));
	  if (errno != 0)
	    {
	      sprintf (buf, "writing all regs, number %d", regno);
	      perror_with_name (buf);
	    }
	}
    }
}


/* 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 buf[TARGET_PTR_BIT / TARGET_CHAR_BIT];

  jb_addr = read_register (A0_REGNUM);

  if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf,
			  TARGET_PTR_BIT / TARGET_CHAR_BIT))
    return 0;

  *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);

  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.
 */

void
fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
     char *core_reg_sect;
     unsigned core_reg_size;
     int which;
     unsigned reg_addr;
{
  register int regno;
  register unsigned int addr;
  int bad_reg = -1;
  register reg_ptr = -reg_addr;		/* Original u.u_ar0 is -reg_addr. */

  /* If u.u_ar0 was an absolute address in the core file, relativize it now,
     so we can use it as an offset into core_reg_sect.  When we're done,
     "register 0" will be at core_reg_sect+reg_ptr, and we can use
     register_addr to offset to the other registers.  If this is a modern
     core file without a upage, reg_ptr will be zero and this is all a big
     NOP.  */
  if (reg_ptr > core_reg_size)
#ifdef KERNEL_U_ADDR
    reg_ptr -= KERNEL_U_ADDR;
#else
    error ("Old mips core file can't be processed on this machine.");
#endif

  for (regno = 0; regno < NUM_REGS; regno++)
    {
      addr = register_addr (regno, reg_ptr);
      if (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.", reg_names[bad_reg]);
    }
  supply_register (ZERO_REGNUM, zerobuf);
  /* Frame ptr reg must appear to be 0; it is faked by stack handling code. */
  supply_register (FP_REGNUM, zerobuf);
}

/* Return the address in the core dump or inferior of register REGNO.
   BLOCKEND is the address of the end of the user structure.  */

unsigned int
register_addr (regno, blockend)
     int regno;
     int blockend;
{
  int addr;

  if (regno < 0 || regno >= NUM_REGS)
    error ("Invalid register number %d.", regno);

  REGISTER_U_ADDR (addr, blockend, regno);

  return addr;
}
Commit	Line	Data
2268d619	1	/* Low level DECstation interface to ptrace, for GDB when running native.
a70dc898 RP	2	Copyright 1988, 1989, 1991, 1992 Free Software Foundation, Inc.
	3	Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU
	4	and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin.
	5
	6	This file is part of GDB.
	7
	8	This program is free software; you can redistribute it and/or modify
	9	it under the terms of the GNU General Public License as published by
	10	the Free Software Foundation; either version 2 of the License, or
	11	(at your option) any later version.
	12
	13	This program is distributed in the hope that it will be useful,
	14	but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	GNU General Public License for more details.
	17
	18	You should have received a copy of the GNU General Public License
	19	along with this program; if not, write to the Free Software
	20	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
	21
	22	#include "defs.h"
	23	#include "inferior.h"
	24	#include "gdbcore.h"
2268d619	25	#include <sys/ptrace.h>
56fc16c7 SG	26	#include <sys/types.h>
56fc16c7 SG	27	#include <sys/param.h>
56fc16c7	28	#include <sys/user.h>
2675499b SG	29	#undef JB_S0
	30	#undef JB_S1
	31	#undef JB_S2
	32	#undef JB_S3
	33	#undef JB_S4
	34	#undef JB_S5
	35	#undef JB_S6
	36	#undef JB_S7
	37	#undef JB_SP
	38	#undef JB_S8
	39	#undef JB_PC
	40	#undef JB_SR
	41	#undef NJBREGS
	42	#include <setjmp.h> /* For JB_XXX. */
56fc16c7	43
2268d619	44	/* Size of elements in jmpbuf */
a70dc898	45
2268d619	46	#define JB_ELEMENT_SIZE 4
a70dc898 RP	47
	48	/* Map gdb internal register number to ptrace ``address''.
	49	These ``addresses'' are defined in DECstation <sys/ptrace.h> */
	50
	51	#define REGISTER_PTRACE_ADDR(regno) \
	52	(regno < 32 ? GPR_BASE + regno \
	53	: regno == PC_REGNUM ? PC \
	54	: regno == CAUSE_REGNUM ? CAUSE \
	55	: regno == HI_REGNUM ? MMHI \
	56	: regno == LO_REGNUM ? MMLO \
	57	: regno == FCRCS_REGNUM ? FPC_CSR \
	58	: regno == FCRIR_REGNUM ? FPC_EIR \
	59	: regno >= FP0_REGNUM ? FPR_BASE + (regno - FP0_REGNUM) \
	60	: 0)
	61
3496b745	62	static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0};
a70dc898 RP	63
	64	/* Get all registers from the inferior */
	65
	66	void
	67	fetch_inferior_registers (regno)
	68	int regno;
	69	{
	70	register unsigned int regaddr;
	71	char buf[MAX_REGISTER_RAW_SIZE];
	72	register int i;
	73
	74	registers_fetched ();
	75
	76	for (regno = 1; regno < NUM_REGS; regno++)
	77	{
	78	regaddr = REGISTER_PTRACE_ADDR (regno);
	79	for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
	80	{
	81	(int ) &buf[i] = ptrace (PT_READ_U, inferior_pid,
	82	(PTRACE_ARG3_TYPE) regaddr, 0);
	83	regaddr += sizeof (int);
	84	}
	85	supply_register (regno, buf);
	86	}
	87
	88	supply_register (ZERO_REGNUM, zerobuf);
	89	/* Frame ptr reg must appear to be 0; it is faked by stack handling code. */
	90	supply_register (FP_REGNUM, zerobuf);
	91	}
	92
	93	/* Store our register values back into the inferior.
	94	If REGNO is -1, do this for all registers.
	95	Otherwise, REGNO specifies which register (so we can save time). */
	96
	97	void
	98	store_inferior_registers (regno)
	99	int regno;
	100	{
	101	register unsigned int regaddr;
	102	char buf[80];
	103
	104	if (regno == 0)
	105	return;
	106
	107	if (regno > 0)
	108	{
	109	regaddr = REGISTER_PTRACE_ADDR (regno);
	110	errno = 0;
	111	ptrace (PT_WRITE_U, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
	112	read_register (regno));
	113	if (errno != 0)
	114	{
	115	sprintf (buf, "writing register number %d", regno);
	116	perror_with_name (buf);
	117	}
	118	}
	119	else
	120	{
	121	for (regno = 0; regno < NUM_REGS; regno++)
	122	{
	123	if (regno == ZERO_REGNUM \|\| regno == PS_REGNUM
	124	\|\| regno == BADVADDR_REGNUM \|\| regno == CAUSE_REGNUM
	125	\|\| regno == FCRIR_REGNUM \|\| regno == FP_REGNUM
	126	\|\| (regno >= FIRST_EMBED_REGNUM && regno <= LAST_EMBED_REGNUM))
127	continue;
0b0d6c3f	128	regaddr = REGISTER_PTRACE_ADDR (regno);
a70dc898 RP	129	errno = 0;
	130	ptrace (6, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
	131	read_register (regno));
	132	if (errno != 0)
	133	{
	134	sprintf (buf, "writing all regs, number %d", regno);
	135	perror_with_name (buf);
	136	}
	137	}
	138	}
	139	}
	140
a70dc898	141
2268d619 JG	142	/* Figure out where the longjmp will land.
	143	We expect the first arg to be a pointer to the jmp_buf structure from which
	144	we extract the pc (JB_PC) that we will land at. The pc is copied into PC.
	145	This routine returns true on success. */
	146
	147	int
	148	get_longjmp_target(pc)
	149	CORE_ADDR *pc;
	150	{
	151	CORE_ADDR jb_addr;
34df79fc	152	char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT];
2268d619	153
34df79fc	154	jb_addr = read_register (A0_REGNUM);
a70dc898	155
34df79fc JK	156	if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf,
34df79fc JK	157	TARGET_PTR_BIT / TARGET_CHAR_BIT))
2268d619 JG	158	return 0;
2268d619 JG	159
34df79fc	160	*pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
2268d619 JG	161
	162	return 1;
	163	}
56fc16c7 SG	164
	165	/* Extract the register values out of the core file and store
	166	them where `read_register' will find them.
	167
	168	CORE_REG_SECT points to the register values themselves, read into memory.
	169	CORE_REG_SIZE is the size of that area.
	170	WHICH says which set of registers we are handling (0 = int, 2 = float
	171	on machines where they are discontiguous).
	172	REG_ADDR is the offset from u.u_ar0 to the register values relative to
	173	core_reg_sect. This is used with old-fashioned core files to
	174	locate the registers in a large upage-plus-stack ".reg" section.
	175	Original upage address X is at location core_reg_sect+x+reg_addr.
	176	*/
	177
	178	void
	179	fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
	180	char *core_reg_sect;
	181	unsigned core_reg_size;
	182	int which;
	183	unsigned reg_addr;
	184	{
	185	register int regno;
	186	register unsigned int addr;
	187	int bad_reg = -1;
	188	register reg_ptr = -reg_addr; /* Original u.u_ar0 is -reg_addr. */
	189
	190	/* If u.u_ar0 was an absolute address in the core file, relativize it now,
	191	so we can use it as an offset into core_reg_sect. When we're done,
	192	"register 0" will be at core_reg_sect+reg_ptr, and we can use
	193	register_addr to offset to the other registers. If this is a modern
	194	core file without a upage, reg_ptr will be zero and this is all a big
	195	NOP. */
	196	if (reg_ptr > core_reg_size)
3762d624	197	#ifdef KERNEL_U_ADDR
56fc16c7	198	reg_ptr -= KERNEL_U_ADDR;
3762d624 JK	199	#else
	200	error ("Old mips core file can't be processed on this machine.");
	201	#endif
56fc16c7 SG	202
	203	for (regno = 0; regno < NUM_REGS; regno++)
	204	{
	205	addr = register_addr (regno, reg_ptr);
	206	if (addr >= core_reg_size) {
	207	if (bad_reg < 0)
	208	bad_reg = regno;
	209	} else {
	210	supply_register (regno, core_reg_sect + addr);
	211	}
	212	}
	213	if (bad_reg >= 0)
	214	{
	215	error ("Register %s not found in core file.", reg_names[bad_reg]);
	216	}
	217	supply_register (ZERO_REGNUM, zerobuf);
	218	/* Frame ptr reg must appear to be 0; it is faked by stack handling code. */
	219	supply_register (FP_REGNUM, zerobuf);
	220	}
	221
	222	/* Return the address in the core dump or inferior of register REGNO.
	223	BLOCKEND is the address of the end of the user structure. */
	224
	225	unsigned int
	226	register_addr (regno, blockend)
	227	int regno;
	228	int blockend;
	229	{
	230	int addr;
	231
	232	if (regno < 0 \|\| regno >= NUM_REGS)
	233	error ("Invalid register number %d.", regno);
	234
	235	REGISTER_U_ADDR (addr, blockend, regno);
	236
	237	return addr;
	238	}