293 lines
7.8 KiB
C
293 lines
7.8 KiB
C
/* Low level Alpha interface, for GDB when running native.
|
||
Copyright 1993, 1995, 1996 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>
|
||
#include <sys/param.h>
|
||
#include <sys/types.h>
|
||
#include <sys/time.h>
|
||
#include <sys/proc.h>
|
||
#include <machine/reg.h>
|
||
#include <machine/frame.h>
|
||
#include <machine/pcb.h>
|
||
#include <string.h>
|
||
|
||
/* 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;
|
||
}
|
||
|
||
static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0};
|
||
|
||
/* Determine if PT_GETREGS fetches this register. */
|
||
#define GETREGS_SUPPLIES(regno) \
|
||
(((regno) >= V0_REGNUM && (regno) <= ZERO_REGNUM) || \
|
||
(regno) >= PC_REGNUM)
|
||
|
||
static void
|
||
supply_regs (regs)
|
||
char *regs;
|
||
{
|
||
int i;
|
||
|
||
/* Conveniently, GDB's register indices map directly to the NetBSD
|
||
"reg" structure. */
|
||
for (i = V0_REGNUM; i < ZERO_REGNUM; i++)
|
||
supply_register (i, regs + (i * 8));
|
||
supply_register (ZERO_REGNUM, zerobuf);
|
||
|
||
/* The PC rides in the R_ZERO slot of the "reg" structure. */
|
||
supply_register (PC_REGNUM, regs + (31 * 8));
|
||
}
|
||
|
||
static void
|
||
supply_fpregs (fregs)
|
||
char *fregs;
|
||
{
|
||
int i;
|
||
|
||
for (i = FP0_REGNUM; i < FPCR_REGNUM; i++)
|
||
supply_register (i, fregs + ((i - FP0_REGNUM) * 8));
|
||
|
||
supply_register (FPCR_REGNUM, fregs + (32 * 8));
|
||
}
|
||
|
||
void
|
||
fetch_inferior_registers (regno)
|
||
int regno;
|
||
{
|
||
struct reg inferior_registers;
|
||
struct fpreg inferior_fp_registers;
|
||
|
||
if (regno == -1 || GETREGS_SUPPLIES (regno))
|
||
{
|
||
ptrace (PT_GETREGS, inferior_pid,
|
||
(PTRACE_ARG3_TYPE) &inferior_registers, 0);
|
||
supply_regs ((char *) &inferior_registers);
|
||
}
|
||
|
||
if (regno == -1 || regno >= FP0_REGNUM)
|
||
{
|
||
ptrace (PT_GETFPREGS, inferior_pid,
|
||
(PTRACE_ARG3_TYPE) &inferior_fp_registers, 0);
|
||
supply_fpregs ((char *) &inferior_fp_registers);
|
||
}
|
||
|
||
/* Reset virtual frame pointer. */
|
||
supply_register (FP_REGNUM, NULL);
|
||
}
|
||
|
||
void
|
||
store_inferior_registers (regno)
|
||
int regno;
|
||
{
|
||
struct reg inferior_registers;
|
||
struct fpreg inferior_fp_registers;
|
||
|
||
if (regno == -1 || GETREGS_SUPPLIES (regno))
|
||
{
|
||
memcpy (&inferior_registers.r_regs[0],
|
||
®isters[REGISTER_BYTE (0)],
|
||
sizeof(inferior_registers.r_regs));
|
||
|
||
/* The PC travels in the R_ZERO slot. */
|
||
inferior_registers.r_regs[R_ZERO] =
|
||
*(long *) ®isters[REGISTER_BYTE (PC_REGNUM)];
|
||
|
||
ptrace (PT_SETREGS, inferior_pid,
|
||
(PTRACE_ARG3_TYPE) &inferior_registers, 0);
|
||
}
|
||
|
||
if (regno == -1 || regno >= FP0_REGNUM)
|
||
{
|
||
memcpy (&inferior_fp_registers.fpr_regs[0],
|
||
®isters[REGISTER_BYTE (FP0_REGNUM)],
|
||
sizeof(inferior_fp_registers.fpr_regs));
|
||
memcpy (&inferior_fp_registers.fpr_cr,
|
||
®isters[REGISTER_BYTE (FPCR_REGNUM)],
|
||
sizeof(inferior_fp_registers.fpr_cr));
|
||
ptrace (PT_SETFPREGS, inferior_pid,
|
||
(PTRACE_ARG3_TYPE) &inferior_fp_registers, 0);
|
||
}
|
||
}
|
||
|
||
static void
|
||
fetch_core_registers (core_reg_sect, core_reg_size, which, ignore)
|
||
char *core_reg_sect;
|
||
unsigned core_reg_size;
|
||
int which;
|
||
CORE_ADDR ignore;
|
||
{
|
||
struct md_coredump *core_reg;
|
||
char *regs;
|
||
register int regnum;
|
||
|
||
/* Table to map a gdb regnum to an index in the trapframe regs. */
|
||
static int core_reg_mapping[ZERO_REGNUM] = {
|
||
FRAME_V0, FRAME_T0, FRAME_T1, FRAME_T2,
|
||
FRAME_T3, FRAME_T4, FRAME_T5, FRAME_T6,
|
||
FRAME_T7, FRAME_S0, FRAME_S1, FRAME_S2,
|
||
FRAME_S3, FRAME_S4, FRAME_S5, FRAME_S6,
|
||
FRAME_A0, FRAME_A1, FRAME_A2, FRAME_A3,
|
||
FRAME_A4, FRAME_A5, FRAME_T8, FRAME_T9,
|
||
FRAME_T10, FRAME_T11, FRAME_RA, FRAME_T12,
|
||
FRAME_AT, FRAME_GP, FRAME_SP };
|
||
|
||
/* We get everything from the .reg section. */
|
||
if (which != 0)
|
||
return;
|
||
|
||
core_reg = (struct md_coredump *)core_reg_sect;
|
||
regs = (char *) &core_reg->md_tf;
|
||
|
||
if (core_reg_size < sizeof(*core_reg)) {
|
||
fprintf_unfiltered (gdb_stderr, "Couldn't read regs from core file\n");
|
||
return;
|
||
}
|
||
|
||
/* Integer registers */
|
||
for (regnum = 0; regnum < ZERO_REGNUM; regnum++)
|
||
supply_register (regnum, regs + (core_reg_mapping[regnum] * 8));
|
||
supply_register (ZERO_REGNUM, zerobuf);
|
||
|
||
/* Floating point registers */
|
||
supply_fpregs ((char *) &core_reg->md_fpstate);
|
||
|
||
/* Special registers (PC, VFP) */
|
||
supply_register (PC_REGNUM, regs + (FRAME_PC * 8));
|
||
supply_register (FP_REGNUM, zerobuf);
|
||
}
|
||
|
||
static void
|
||
fetch_elfcore_registers (core_reg_sect, core_reg_size, which, ignore)
|
||
char *core_reg_sect;
|
||
unsigned core_reg_size;
|
||
int which;
|
||
CORE_ADDR ignore;
|
||
{
|
||
switch (which)
|
||
{
|
||
case 0: /* Integer registers */
|
||
if (core_reg_size != sizeof (struct reg))
|
||
warning ("Wrong size register set in core file.");
|
||
else
|
||
supply_regs (core_reg_sect);
|
||
break;
|
||
|
||
case 2: /* Floating point registers */
|
||
if (core_reg_size != sizeof (struct fpreg))
|
||
warning ("Wrong size FP register set in core file.");
|
||
else
|
||
supply_fpregs (core_reg_sect);
|
||
break;
|
||
|
||
default:
|
||
/* Don't know what kind of register request this is; just ignore it. */
|
||
break;
|
||
}
|
||
}
|
||
|
||
|
||
#ifdef FETCH_KCORE_REGISTERS
|
||
/*
|
||
* Get registers from a kernel crash dump or live kernel.
|
||
* Called by kcore-nbsd.c:get_kcore_registers().
|
||
*/
|
||
fetch_kcore_registers (pcbp)
|
||
struct pcb *pcbp;
|
||
{
|
||
|
||
/* First clear out any garbage. */
|
||
memset(registers, '\0', REGISTER_BYTES);
|
||
|
||
/* SP */
|
||
*(long *) ®isters[REGISTER_BYTE (SP_REGNUM)] =
|
||
pcbp->pcb_hw.apcb_ksp;
|
||
|
||
/* S0 through S6 */
|
||
memcpy (®isters[REGISTER_BYTE (S0_REGNUM)],
|
||
&pcbp->pcb_context[0], 7 * sizeof(long));
|
||
|
||
/* PC */
|
||
*(long *) ®isters[REGISTER_BYTE (PC_REGNUM)] =
|
||
pcbp->pcb_context[7];
|
||
|
||
registers_fetched ();
|
||
}
|
||
#endif /* FETCH_KCORE_REGISTERS */
|
||
|
||
static struct core_fns alphanbsd_core_fns =
|
||
{
|
||
bfd_target_unknown_flavour, /* core_flavour */
|
||
default_check_format, /* check_format */
|
||
default_core_sniffer, /* core_sniffer */
|
||
fetch_core_registers, /* core_read_registers */
|
||
NULL /* next */
|
||
};
|
||
|
||
static struct core_fns alphanbsd_elfcore_fns =
|
||
{
|
||
bfd_target_elf_flavour, /* core_flavour */
|
||
default_check_format, /* check_format */
|
||
default_core_sniffer, /* core_sniffer */
|
||
fetch_elfcore_registers, /* core_read_registers */
|
||
NULL /* next */
|
||
};
|
||
|
||
void
|
||
_initialize_alphanbsd_nat ()
|
||
{
|
||
add_core_fns (&alphanbsd_core_fns);
|
||
add_core_fns (&alphanbsd_elfcore_fns);
|
||
}
|