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https://github.com/darlinghq/darling-gdb.git
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365 lines
10 KiB
C
365 lines
10 KiB
C
/* 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
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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
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <sys/types.h>
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#include <sys/ptrace.h>
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#include <machine/reg.h>
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#include <machine/frame.h>
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#include <machine/pcb.h>
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#include "defs.h"
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#include "inferior.h"
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#include "target.h"
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#include "gdbcore.h"
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#include "regcache.h"
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#define RF(dst, src) \
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memcpy(®isters[REGISTER_BYTE(dst)], &src, sizeof(src))
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#define RS(src, dst) \
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memcpy(&dst, ®isters[REGISTER_BYTE(src)], sizeof(dst))
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void
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fetch_inferior_registers (int regno)
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{
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struct reg inferior_registers;
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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);
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RF (R0_REGNUM + 0, inferior_registers.r_r0);
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RF (R0_REGNUM + 1, inferior_registers.r_r1);
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RF (R0_REGNUM + 2, inferior_registers.r_r2);
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RF (R0_REGNUM + 3, inferior_registers.r_r3);
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RF (R0_REGNUM + 4, inferior_registers.r_r4);
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RF (R0_REGNUM + 5, inferior_registers.r_r5);
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RF (R0_REGNUM + 6, inferior_registers.r_r6);
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RF (R0_REGNUM + 7, inferior_registers.r_r7);
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RF (SP_REGNUM, inferior_registers.r_sp);
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RF (FP_REGNUM, inferior_registers.r_fp);
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RF (PC_REGNUM, inferior_registers.r_pc);
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RF (PS_REGNUM, inferior_registers.r_psr);
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RF (FPS_REGNUM, inferior_fpregisters.r_fsr);
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RF (FP0_REGNUM + 0, inferior_fpregisters.r_freg[0]);
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RF (FP0_REGNUM + 2, inferior_fpregisters.r_freg[2]);
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RF (FP0_REGNUM + 4, inferior_fpregisters.r_freg[4]);
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RF (FP0_REGNUM + 6, inferior_fpregisters.r_freg[6]);
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RF (LP0_REGNUM + 1, inferior_fpregisters.r_freg[1]);
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RF (LP0_REGNUM + 3, inferior_fpregisters.r_freg[3]);
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RF (LP0_REGNUM + 5, inferior_fpregisters.r_freg[5]);
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RF (LP0_REGNUM + 7, inferior_fpregisters.r_freg[7]);
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registers_fetched ();
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}
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void
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store_inferior_registers (int regno)
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{
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struct reg inferior_registers;
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struct fpreg inferior_fpregisters;
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RS (R0_REGNUM + 0, inferior_registers.r_r0);
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RS (R0_REGNUM + 1, inferior_registers.r_r1);
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RS (R0_REGNUM + 2, inferior_registers.r_r2);
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RS (R0_REGNUM + 3, inferior_registers.r_r3);
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RS (R0_REGNUM + 4, inferior_registers.r_r4);
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RS (R0_REGNUM + 5, inferior_registers.r_r5);
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RS (R0_REGNUM + 6, inferior_registers.r_r6);
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RS (R0_REGNUM + 7, inferior_registers.r_r7);
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RS (SP_REGNUM, inferior_registers.r_sp);
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RS (FP_REGNUM, inferior_registers.r_fp);
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RS (PC_REGNUM, inferior_registers.r_pc);
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RS (PS_REGNUM, inferior_registers.r_psr);
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RS (FPS_REGNUM, inferior_fpregisters.r_fsr);
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RS (FP0_REGNUM + 0, inferior_fpregisters.r_freg[0]);
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RS (FP0_REGNUM + 2, inferior_fpregisters.r_freg[2]);
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RS (FP0_REGNUM + 4, inferior_fpregisters.r_freg[4]);
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RS (FP0_REGNUM + 6, inferior_fpregisters.r_freg[6]);
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RS (LP0_REGNUM + 1, inferior_fpregisters.r_freg[1]);
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RS (LP0_REGNUM + 3, inferior_fpregisters.r_freg[3]);
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RS (LP0_REGNUM + 5, inferior_fpregisters.r_freg[5]);
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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);
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}
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/* XXX - Add this to machine/regs.h instead? */
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struct coreregs
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{
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struct reg intreg;
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struct fpreg freg;
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};
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/* Get registers from a core file. REG_ADDR is unused. */
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static void
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fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which,
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unsigned int reg_addr)
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{
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struct coreregs *core_reg;
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core_reg = (struct coreregs *) core_reg_sect;
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/*
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* We have *all* registers
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* in the first core section.
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* Ignore which.
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*/
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if (core_reg_size < sizeof (*core_reg))
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{
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fprintf_unfiltered (gdb_stderr, "Couldn't read regs from core file\n");
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return;
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}
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/* Integer registers */
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RF (R0_REGNUM + 0, core_reg->intreg.r_r0);
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RF (R0_REGNUM + 1, core_reg->intreg.r_r1);
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RF (R0_REGNUM + 2, core_reg->intreg.r_r2);
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RF (R0_REGNUM + 3, core_reg->intreg.r_r3);
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RF (R0_REGNUM + 4, core_reg->intreg.r_r4);
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RF (R0_REGNUM + 5, core_reg->intreg.r_r5);
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RF (R0_REGNUM + 6, core_reg->intreg.r_r6);
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RF (R0_REGNUM + 7, core_reg->intreg.r_r7);
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RF (SP_REGNUM, core_reg->intreg.r_sp);
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RF (FP_REGNUM, core_reg->intreg.r_fp);
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RF (PC_REGNUM, core_reg->intreg.r_pc);
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RF (PS_REGNUM, core_reg->intreg.r_psr);
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/* Floating point registers */
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RF (FPS_REGNUM, core_reg->freg.r_fsr);
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RF (FP0_REGNUM + 0, core_reg->freg.r_freg[0]);
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RF (FP0_REGNUM + 2, core_reg->freg.r_freg[2]);
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RF (FP0_REGNUM + 4, core_reg->freg.r_freg[4]);
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RF (FP0_REGNUM + 6, core_reg->freg.r_freg[6]);
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RF (LP0_REGNUM + 1, core_reg->freg.r_freg[1]);
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RF (LP0_REGNUM + 3, core_reg->freg.r_freg[3]);
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RF (LP0_REGNUM + 5, core_reg->freg.r_freg[5]);
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RF (LP0_REGNUM + 7, core_reg->freg.r_freg[7]);
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registers_fetched ();
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}
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/* Register that we are able to handle ns32knbsd core file formats.
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FIXME: is this really bfd_target_unknown_flavour? */
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static struct core_fns nat_core_fns =
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{
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bfd_target_unknown_flavour, /* core_flavour */
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default_check_format, /* check_format */
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default_core_sniffer, /* core_sniffer */
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fetch_core_registers, /* core_read_registers */
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NULL /* next */
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};
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void
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_initialize_ns32knbsd_nat (void)
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{
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add_core_fns (&nat_core_fns);
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}
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/*
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* kernel_u_size() is not helpful on NetBSD because
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* the "u" struct is NOT in the core dump file.
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*/
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#ifdef FETCH_KCORE_REGISTERS
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/*
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* Get registers from a kernel crash dump or live kernel.
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* Called by kcore-nbsd.c:get_kcore_registers().
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*/
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void
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fetch_kcore_registers (struct pcb *pcb)
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{
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struct switchframe sf;
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struct reg intreg;
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int dummy;
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/* Integer registers */
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if (target_read_memory ((CORE_ADDR) pcb->pcb_ksp, (char *) &sf, sizeof sf))
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error ("Cannot read integer registers.");
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/* We use the psr at kernel entry */
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if (target_read_memory ((CORE_ADDR) pcb->pcb_onstack, (char *) &intreg, sizeof intreg))
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error ("Cannot read processor status register.");
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dummy = 0;
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RF (R0_REGNUM + 0, dummy);
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RF (R0_REGNUM + 1, dummy);
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RF (R0_REGNUM + 2, dummy);
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RF (R0_REGNUM + 3, sf.sf_r3);
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RF (R0_REGNUM + 4, sf.sf_r4);
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RF (R0_REGNUM + 5, sf.sf_r5);
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RF (R0_REGNUM + 6, sf.sf_r6);
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RF (R0_REGNUM + 7, sf.sf_r7);
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dummy = pcb->pcb_kfp + 8;
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RF (SP_REGNUM, dummy);
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RF (FP_REGNUM, sf.sf_fp);
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RF (PC_REGNUM, sf.sf_pc);
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RF (PS_REGNUM, intreg.r_psr);
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/* Floating point registers */
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RF (FPS_REGNUM, pcb->pcb_fsr);
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RF (FP0_REGNUM + 0, pcb->pcb_freg[0]);
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RF (FP0_REGNUM + 2, pcb->pcb_freg[2]);
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RF (FP0_REGNUM + 4, pcb->pcb_freg[4]);
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RF (FP0_REGNUM + 6, pcb->pcb_freg[6]);
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RF (LP0_REGNUM + 1, pcb->pcb_freg[1]);
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RF (LP0_REGNUM + 3, pcb->pcb_freg[3]);
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RF (LP0_REGNUM + 5, pcb->pcb_freg[5]);
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RF (LP0_REGNUM + 7, pcb->pcb_freg[7]);
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registers_fetched ();
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}
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#endif /* FETCH_KCORE_REGISTERS */
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void
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clear_regs (void)
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{
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double zero = 0.0;
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int null = 0;
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/* Integer registers */
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RF (R0_REGNUM + 0, null);
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RF (R0_REGNUM + 1, null);
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RF (R0_REGNUM + 2, null);
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RF (R0_REGNUM + 3, null);
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RF (R0_REGNUM + 4, null);
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RF (R0_REGNUM + 5, null);
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RF (R0_REGNUM + 6, null);
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RF (R0_REGNUM + 7, null);
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RF (SP_REGNUM, null);
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RF (FP_REGNUM, null);
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RF (PC_REGNUM, null);
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RF (PS_REGNUM, null);
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/* Floating point registers */
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RF (FPS_REGNUM, zero);
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RF (FP0_REGNUM + 0, zero);
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RF (FP0_REGNUM + 2, zero);
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RF (FP0_REGNUM + 4, zero);
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RF (FP0_REGNUM + 6, zero);
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RF (LP0_REGNUM + 0, zero);
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RF (LP0_REGNUM + 1, zero);
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RF (LP0_REGNUM + 2, zero);
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RF (LP0_REGNUM + 3, zero);
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return;
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}
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/* Return number of args passed to a frame.
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Can return -1, meaning no way to tell. */
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int
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frame_num_args (struct frame_info *fi)
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{
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CORE_ADDR enter_addr;
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CORE_ADDR argp;
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int inst;
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int args;
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int i;
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if (read_memory_integer (fi->frame, 4) == 0 && fi->pc < 0x10000)
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{
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/* main is always called with three args */
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return (3);
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}
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enter_addr = ns32k_get_enter_addr (fi->pc);
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if (enter_addr = 0)
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return (-1);
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argp = enter_addr == 1 ? SAVED_PC_AFTER_CALL (fi) : FRAME_SAVED_PC (fi);
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for (i = 0; i < 16; i++)
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{
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/*
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* After a bsr gcc may emit the following instructions
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* to remove the arguments from the stack:
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* cmpqd 0,tos - to remove 4 bytes from the stack
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* cmpd tos,tos - to remove 8 bytes from the stack
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* adjsp[bwd] -n - to remove n bytes from the stack
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* Gcc sometimes delays emitting these instructions and
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* may even throw a branch between our feet.
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*/
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inst = read_memory_integer (argp, 4);
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args = read_memory_integer (argp + 2, 4);
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if ((inst & 0xff) == 0xea)
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{ /* br */
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args = ((inst >> 8) & 0xffffff) | (args << 24);
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if (args & 0x80)
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{
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if (args & 0x40)
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{
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args = ntohl (args);
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}
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else
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{
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args = ntohs (args & 0xffff);
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if (args & 0x2000)
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args |= 0xc000;
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}
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}
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else
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{
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args = args & 0xff;
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if (args & 0x40)
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args |= 0x80;
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}
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argp += args;
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continue;
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}
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if ((inst & 0xffff) == 0xb81f) /* cmpqd 0,tos */
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return (1);
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else if ((inst & 0xffff) == 0xbdc7) /* cmpd tos,tos */
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return (2);
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else if ((inst & 0xfffc) == 0xa57c)
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{ /* adjsp[bwd] */
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switch (inst & 3)
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{
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case 0:
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args = ((args & 0xff) + 0x80);
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break;
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case 1:
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args = ((ntohs (args) & 0xffff) + 0x8000);
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break;
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case 3:
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args = -ntohl (args);
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break;
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default:
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return (-1);
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}
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if (args / 4 > 10 || (args & 3) != 0)
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continue;
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return (args / 4);
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}
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argp += 1;
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}
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return (-1);
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}
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