binutils-gdb/gdb/ns32knbsd-nat.c

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/* Functions specific to running gdb native on an ns32k running NetBSD
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Copyright 1989, 1992, 1993, 1994, 1996, 1998, 1999, 2000, 2001
Free Software Foundation, Inc.
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This file is part of GDB.
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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.
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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.
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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 <sys/types.h>
#include <sys/ptrace.h>
#include <machine/reg.h>
#include <machine/frame.h>
#include <machine/pcb.h>
#include "defs.h"
#include "inferior.h"
#include "target.h"
#include "gdbcore.h"
#include "regcache.h"
#define RF(dst, src) \
memcpy(&registers[REGISTER_BYTE(dst)], &src, sizeof(src))
#define RS(src, dst) \
memcpy(&dst, &registers[REGISTER_BYTE(src)], sizeof(dst))
void
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fetch_inferior_registers (int regno)
{
struct reg inferior_registers;
struct fpreg inferior_fpregisters;
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ptrace (PT_GETREGS, PIDGET (inferior_ptid),
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(PTRACE_ARG3_TYPE) & inferior_registers, 0);
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ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
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(PTRACE_ARG3_TYPE) & inferior_fpregisters, 0);
RF (R0_REGNUM + 0, inferior_registers.r_r0);
RF (R0_REGNUM + 1, inferior_registers.r_r1);
RF (R0_REGNUM + 2, inferior_registers.r_r2);
RF (R0_REGNUM + 3, inferior_registers.r_r3);
RF (R0_REGNUM + 4, inferior_registers.r_r4);
RF (R0_REGNUM + 5, inferior_registers.r_r5);
RF (R0_REGNUM + 6, inferior_registers.r_r6);
RF (R0_REGNUM + 7, inferior_registers.r_r7);
RF (SP_REGNUM, inferior_registers.r_sp);
RF (FP_REGNUM, inferior_registers.r_fp);
RF (PC_REGNUM, inferior_registers.r_pc);
RF (PS_REGNUM, inferior_registers.r_psr);
RF (FPS_REGNUM, inferior_fpregisters.r_fsr);
RF (FP0_REGNUM + 0, inferior_fpregisters.r_freg[0]);
RF (FP0_REGNUM + 2, inferior_fpregisters.r_freg[2]);
RF (FP0_REGNUM + 4, inferior_fpregisters.r_freg[4]);
RF (FP0_REGNUM + 6, inferior_fpregisters.r_freg[6]);
RF (LP0_REGNUM + 1, inferior_fpregisters.r_freg[1]);
RF (LP0_REGNUM + 3, inferior_fpregisters.r_freg[3]);
RF (LP0_REGNUM + 5, inferior_fpregisters.r_freg[5]);
RF (LP0_REGNUM + 7, inferior_fpregisters.r_freg[7]);
registers_fetched ();
}
void
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store_inferior_registers (int regno)
{
struct reg inferior_registers;
struct fpreg inferior_fpregisters;
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RS (R0_REGNUM + 0, inferior_registers.r_r0);
RS (R0_REGNUM + 1, inferior_registers.r_r1);
RS (R0_REGNUM + 2, inferior_registers.r_r2);
RS (R0_REGNUM + 3, inferior_registers.r_r3);
RS (R0_REGNUM + 4, inferior_registers.r_r4);
RS (R0_REGNUM + 5, inferior_registers.r_r5);
RS (R0_REGNUM + 6, inferior_registers.r_r6);
RS (R0_REGNUM + 7, inferior_registers.r_r7);
RS (SP_REGNUM, inferior_registers.r_sp);
RS (FP_REGNUM, inferior_registers.r_fp);
RS (PC_REGNUM, inferior_registers.r_pc);
RS (PS_REGNUM, inferior_registers.r_psr);
RS (FPS_REGNUM, inferior_fpregisters.r_fsr);
RS (FP0_REGNUM + 0, inferior_fpregisters.r_freg[0]);
RS (FP0_REGNUM + 2, inferior_fpregisters.r_freg[2]);
RS (FP0_REGNUM + 4, inferior_fpregisters.r_freg[4]);
RS (FP0_REGNUM + 6, inferior_fpregisters.r_freg[6]);
RS (LP0_REGNUM + 1, inferior_fpregisters.r_freg[1]);
RS (LP0_REGNUM + 3, inferior_fpregisters.r_freg[3]);
RS (LP0_REGNUM + 5, inferior_fpregisters.r_freg[5]);
RS (LP0_REGNUM + 7, inferior_fpregisters.r_freg[7]);
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ptrace (PT_SETREGS, PIDGET (inferior_ptid),
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(PTRACE_ARG3_TYPE) & inferior_registers, 0);
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ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
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(PTRACE_ARG3_TYPE) & inferior_fpregisters, 0);
}
/* XXX - Add this to machine/regs.h instead? */
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struct coreregs
{
struct reg intreg;
struct fpreg freg;
};
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/* Get registers from a core file. REG_ADDR is unused. */
static void
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fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which,
unsigned int reg_addr)
{
struct coreregs *core_reg;
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core_reg = (struct coreregs *) core_reg_sect;
/*
* We have *all* registers
* in the first core section.
* Ignore which.
*/
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if (core_reg_size < sizeof (*core_reg))
{
fprintf_unfiltered (gdb_stderr, "Couldn't read regs from core file\n");
return;
}
/* Integer registers */
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RF (R0_REGNUM + 0, core_reg->intreg.r_r0);
RF (R0_REGNUM + 1, core_reg->intreg.r_r1);
RF (R0_REGNUM + 2, core_reg->intreg.r_r2);
RF (R0_REGNUM + 3, core_reg->intreg.r_r3);
RF (R0_REGNUM + 4, core_reg->intreg.r_r4);
RF (R0_REGNUM + 5, core_reg->intreg.r_r5);
RF (R0_REGNUM + 6, core_reg->intreg.r_r6);
RF (R0_REGNUM + 7, core_reg->intreg.r_r7);
RF (SP_REGNUM, core_reg->intreg.r_sp);
RF (FP_REGNUM, core_reg->intreg.r_fp);
RF (PC_REGNUM, core_reg->intreg.r_pc);
RF (PS_REGNUM, core_reg->intreg.r_psr);
/* Floating point registers */
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RF (FPS_REGNUM, core_reg->freg.r_fsr);
RF (FP0_REGNUM + 0, core_reg->freg.r_freg[0]);
RF (FP0_REGNUM + 2, core_reg->freg.r_freg[2]);
RF (FP0_REGNUM + 4, core_reg->freg.r_freg[4]);
RF (FP0_REGNUM + 6, core_reg->freg.r_freg[6]);
RF (LP0_REGNUM + 1, core_reg->freg.r_freg[1]);
RF (LP0_REGNUM + 3, core_reg->freg.r_freg[3]);
RF (LP0_REGNUM + 5, core_reg->freg.r_freg[5]);
RF (LP0_REGNUM + 7, core_reg->freg.r_freg[7]);
registers_fetched ();
}
/* Register that we are able to handle ns32knbsd core file formats.
FIXME: is this really bfd_target_unknown_flavour? */
static struct core_fns nat_core_fns =
{
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bfd_target_unknown_flavour, /* core_flavour */
default_check_format, /* check_format */
default_core_sniffer, /* core_sniffer */
fetch_core_registers, /* core_read_registers */
NULL /* next */
};
void
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_initialize_ns32knbsd_nat (void)
{
add_core_fns (&nat_core_fns);
}
/*
* kernel_u_size() is not helpful on NetBSD because
* the "u" struct is NOT in the core dump file.
*/
#ifdef FETCH_KCORE_REGISTERS
/*
* Get registers from a kernel crash dump or live kernel.
* Called by kcore-nbsd.c:get_kcore_registers().
*/
void
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fetch_kcore_registers (struct pcb *pcb)
{
struct switchframe sf;
struct reg intreg;
int dummy;
/* Integer registers */
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if (target_read_memory ((CORE_ADDR) pcb->pcb_ksp, (char *) &sf, sizeof sf))
error ("Cannot read integer registers.");
/* We use the psr at kernel entry */
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if (target_read_memory ((CORE_ADDR) pcb->pcb_onstack, (char *) &intreg, sizeof intreg))
error ("Cannot read processor status register.");
dummy = 0;
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RF (R0_REGNUM + 0, dummy);
RF (R0_REGNUM + 1, dummy);
RF (R0_REGNUM + 2, dummy);
RF (R0_REGNUM + 3, sf.sf_r3);
RF (R0_REGNUM + 4, sf.sf_r4);
RF (R0_REGNUM + 5, sf.sf_r5);
RF (R0_REGNUM + 6, sf.sf_r6);
RF (R0_REGNUM + 7, sf.sf_r7);
dummy = pcb->pcb_kfp + 8;
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RF (SP_REGNUM, dummy);
RF (FP_REGNUM, sf.sf_fp);
RF (PC_REGNUM, sf.sf_pc);
RF (PS_REGNUM, intreg.r_psr);
/* Floating point registers */
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RF (FPS_REGNUM, pcb->pcb_fsr);
RF (FP0_REGNUM + 0, pcb->pcb_freg[0]);
RF (FP0_REGNUM + 2, pcb->pcb_freg[2]);
RF (FP0_REGNUM + 4, pcb->pcb_freg[4]);
RF (FP0_REGNUM + 6, pcb->pcb_freg[6]);
RF (LP0_REGNUM + 1, pcb->pcb_freg[1]);
RF (LP0_REGNUM + 3, pcb->pcb_freg[3]);
RF (LP0_REGNUM + 5, pcb->pcb_freg[5]);
RF (LP0_REGNUM + 7, pcb->pcb_freg[7]);
registers_fetched ();
}
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#endif /* FETCH_KCORE_REGISTERS */
void
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clear_regs (void)
{
double zero = 0.0;
int null = 0;
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/* Integer registers */
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RF (R0_REGNUM + 0, null);
RF (R0_REGNUM + 1, null);
RF (R0_REGNUM + 2, null);
RF (R0_REGNUM + 3, null);
RF (R0_REGNUM + 4, null);
RF (R0_REGNUM + 5, null);
RF (R0_REGNUM + 6, null);
RF (R0_REGNUM + 7, null);
RF (SP_REGNUM, null);
RF (FP_REGNUM, null);
RF (PC_REGNUM, null);
RF (PS_REGNUM, null);
/* Floating point registers */
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RF (FPS_REGNUM, zero);
RF (FP0_REGNUM + 0, zero);
RF (FP0_REGNUM + 2, zero);
RF (FP0_REGNUM + 4, zero);
RF (FP0_REGNUM + 6, zero);
RF (LP0_REGNUM + 0, zero);
RF (LP0_REGNUM + 1, zero);
RF (LP0_REGNUM + 2, zero);
RF (LP0_REGNUM + 3, zero);
return;
}
/* Return number of args passed to a frame.
Can return -1, meaning no way to tell. */
int
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frame_num_args (struct frame_info *fi)
{
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CORE_ADDR enter_addr;
CORE_ADDR argp;
int inst;
int args;
int i;
if (read_memory_integer (fi->frame, 4) == 0 && fi->pc < 0x10000)
{
/* main is always called with three args */
return (3);
}
enter_addr = ns32k_get_enter_addr (fi->pc);
if (enter_addr = 0)
return (-1);
argp = enter_addr == 1 ? SAVED_PC_AFTER_CALL (fi) : FRAME_SAVED_PC (fi);
for (i = 0; i < 16; i++)
{
/*
* After a bsr gcc may emit the following instructions
* to remove the arguments from the stack:
* cmpqd 0,tos - to remove 4 bytes from the stack
* cmpd tos,tos - to remove 8 bytes from the stack
* adjsp[bwd] -n - to remove n bytes from the stack
* Gcc sometimes delays emitting these instructions and
* may even throw a branch between our feet.
*/
inst = read_memory_integer (argp, 4);
args = read_memory_integer (argp + 2, 4);
if ((inst & 0xff) == 0xea)
{ /* br */
args = ((inst >> 8) & 0xffffff) | (args << 24);
if (args & 0x80)
{
if (args & 0x40)
{
args = ntohl (args);
}
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else
{
args = ntohs (args & 0xffff);
if (args & 0x2000)
args |= 0xc000;
}
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}
else
{
args = args & 0xff;
if (args & 0x40)
args |= 0x80;
}
argp += args;
continue;
}
if ((inst & 0xffff) == 0xb81f) /* cmpqd 0,tos */
return (1);
else if ((inst & 0xffff) == 0xbdc7) /* cmpd tos,tos */
return (2);
else if ((inst & 0xfffc) == 0xa57c)
{ /* adjsp[bwd] */
switch (inst & 3)
{
case 0:
args = ((args & 0xff) + 0x80);
break;
case 1:
args = ((ntohs (args) & 0xffff) + 0x8000);
break;
case 3:
args = -ntohl (args);
break;
default:
return (-1);
}
if (args / 4 > 10 || (args & 3) != 0)
continue;
return (args / 4);
}
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argp += 1;
}
return (-1);
}