old-cross-binutils/gdb/alpha-nat.c
1999-04-16 01:35:26 +00:00

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/* 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 PARAMS ((char *,
unsigned, int, CORE_ADDR));
static void fetch_elf_core_registers PARAMS ((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>
/*
* 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,
fetch_osf_core_registers,
NULL
};
static struct core_fns alpha_elf_core_fns =
{
bfd_target_elf_flavour,
fetch_elf_core_registers,
NULL
};
void
_initialize_core_alpha ()
{
add_core_fns (&alpha_osf_core_fns);
add_core_fns (&alpha_elf_core_fns);
}