337 lines
8.7 KiB
C
337 lines
8.7 KiB
C
/* Low level Alpha interface, for GDB when running native.
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Copyright 1993, 1995, 1996 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 "defs.h"
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#include "inferior.h"
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#include "gdbcore.h"
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#include "target.h"
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#include <sys/ptrace.h>
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/proc.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 <string.h>
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/* Size of elements in jmpbuf */
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#define JB_ELEMENT_SIZE 8
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/* The definition for JB_PC in machine/reg.h is wrong.
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And we can't get at the correct definition in setjmp.h as it is
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not always available (eg. if _POSIX_SOURCE is defined which is the
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default). As the defintion is unlikely to change (see comment
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in <setjmp.h>, define the correct value here. */
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#undef JB_PC
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#define JB_PC 2
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/* Figure out where the longjmp will land.
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We expect the first arg to be a pointer to the jmp_buf structure from which
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we extract the pc (JB_PC) that we will land at. The pc is copied into PC.
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This routine returns true on success. */
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int
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get_longjmp_target (pc)
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CORE_ADDR *pc;
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{
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CORE_ADDR jb_addr;
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char raw_buffer[MAX_REGISTER_RAW_SIZE];
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jb_addr = read_register(A0_REGNUM);
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if (target_read_memory(jb_addr + JB_PC * JB_ELEMENT_SIZE, raw_buffer,
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sizeof(CORE_ADDR)))
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return 0;
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*pc = extract_address (raw_buffer, sizeof(CORE_ADDR));
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return 1;
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}
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static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0};
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/* Determine if PT_GETREGS fetches this register. */
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#define GETREGS_SUPPLIES(regno) \
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(((regno) >= V0_REGNUM && (regno) <= ZERO_REGNUM) || \
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(regno) >= PC_REGNUM)
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static void
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supply_regs (regs)
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char *regs;
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{
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int i;
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/* Conveniently, GDB's register indices map directly to the NetBSD
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"reg" structure. */
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for (i = V0_REGNUM; i < ZERO_REGNUM; i++)
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supply_register (i, regs + (i * 8));
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supply_register (ZERO_REGNUM, zerobuf);
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/* The PC rides in the R_ZERO slot of the "reg" structure. */
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supply_register (PC_REGNUM, regs + (31 * 8));
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}
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static void
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unsupply_regs (regs)
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struct reg *regs;
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{
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memcpy (®s->r_regs[0], ®isters[REGISTER_BYTE (V0_REGNUM)], 31 * 8);
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memcpy (®s->r_regs[31], ®isters[REGISTER_BYTE (PC_REGNUM)], 8);
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}
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static void
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supply_fpregs (fregs)
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char *fregs;
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{
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int i;
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for (i = FP0_REGNUM; i < FPCR_REGNUM; i++)
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supply_register (i, fregs + ((i - FP0_REGNUM) * 8));
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supply_register (FPCR_REGNUM, fregs + (32 * 8));
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}
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static void
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unsupply_fpregs (fregs)
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struct fpreg *fregs;
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{
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memcpy (&fregs->fpr_regs[0], ®isters[REGISTER_BYTE (FP0_REGNUM)], 31 * 8);
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memcpy (&fregs->fpr_cr, ®isters[REGISTER_BYTE (FPCR_REGNUM)], 8);
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}
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void
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nbsd_reg_to_internal (regs)
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char *regs;
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{
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supply_regs (regs);
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}
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void
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nbsd_fpreg_to_internal (fregs)
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char *fregs;
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{
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supply_fpregs (fregs);
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}
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void
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nbsd_internal_to_reg (regs)
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char *regs;
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{
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unsupply_regs (regs);
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}
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void
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nbsd_internal_to_fpreg (fregs)
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char *fregs;
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{
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unsupply_fpregs (fregs);
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}
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void
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fetch_inferior_registers (regno)
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int regno;
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{
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struct reg inferior_registers;
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struct fpreg inferior_fp_registers;
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if (regno == -1 || GETREGS_SUPPLIES (regno))
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{
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ptrace (PT_GETREGS, GET_PROCESS (inferior_pid),
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(PTRACE_ARG3_TYPE) &inferior_registers, GET_LWP (inferior_pid));
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supply_regs ((char *) &inferior_registers);
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}
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if (regno == -1 || regno >= FP0_REGNUM)
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{
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ptrace (PT_GETFPREGS, GET_PROCESS (inferior_pid),
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(PTRACE_ARG3_TYPE) &inferior_fp_registers, GET_LWP (inferior_pid));
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supply_fpregs ((char *) &inferior_fp_registers);
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}
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/* Reset virtual frame pointer. */
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supply_register (FP_REGNUM, NULL);
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}
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void
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store_inferior_registers (regno)
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int regno;
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{
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struct reg inferior_registers;
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struct fpreg inferior_fp_registers;
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if (regno == -1 || GETREGS_SUPPLIES (regno))
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{
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memcpy (&inferior_registers.r_regs[0],
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®isters[REGISTER_BYTE (0)],
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sizeof(inferior_registers.r_regs));
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/* The PC travels in the R_ZERO slot. */
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inferior_registers.r_regs[R_ZERO] =
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*(long *) ®isters[REGISTER_BYTE (PC_REGNUM)];
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ptrace (PT_SETREGS, GET_PROCESS (inferior_pid),
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(PTRACE_ARG3_TYPE) &inferior_registers, GET_LWP (inferior_pid));
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}
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if (regno == -1 || regno >= FP0_REGNUM)
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{
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memcpy (&inferior_fp_registers.fpr_regs[0],
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®isters[REGISTER_BYTE (FP0_REGNUM)],
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sizeof (inferior_fp_registers.fpr_regs));
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memcpy (&inferior_fp_registers.fpr_cr,
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®isters[REGISTER_BYTE (FPCR_REGNUM)],
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sizeof (inferior_fp_registers.fpr_cr));
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ptrace (PT_SETFPREGS, GET_PROCESS (inferior_pid),
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(PTRACE_ARG3_TYPE) &inferior_fp_registers, GET_LWP (inferior_pid));
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}
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}
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static void
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fetch_core_registers (core_reg_sect, core_reg_size, which, ignore)
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char *core_reg_sect;
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unsigned core_reg_size;
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int which;
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CORE_ADDR ignore;
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{
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struct md_coredump *core_reg;
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char *regs;
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register int regnum;
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/* Table to map a gdb regnum to an index in the trapframe regs. */
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static int core_reg_mapping[ZERO_REGNUM] = {
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FRAME_V0, FRAME_T0, FRAME_T1, FRAME_T2,
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FRAME_T3, FRAME_T4, FRAME_T5, FRAME_T6,
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FRAME_T7, FRAME_S0, FRAME_S1, FRAME_S2,
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FRAME_S3, FRAME_S4, FRAME_S5, FRAME_S6,
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FRAME_A0, FRAME_A1, FRAME_A2, FRAME_A3,
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FRAME_A4, FRAME_A5, FRAME_T8, FRAME_T9,
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FRAME_T10, FRAME_T11, FRAME_RA, FRAME_T12,
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FRAME_AT, FRAME_GP, FRAME_SP };
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/* We get everything from the .reg section. */
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if (which != 0)
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return;
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core_reg = (struct md_coredump *)core_reg_sect;
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regs = (char *) &core_reg->md_tf;
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if (core_reg_size < sizeof(*core_reg)) {
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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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for (regnum = 0; regnum < ZERO_REGNUM; regnum++)
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supply_register (regnum, regs + (core_reg_mapping[regnum] * 8));
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supply_register (ZERO_REGNUM, zerobuf);
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/* Floating point registers */
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supply_fpregs ((char *) &core_reg->md_fpstate);
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/* Special registers (PC, VFP) */
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supply_register (PC_REGNUM, regs + (FRAME_PC * 8));
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supply_register (FP_REGNUM, zerobuf);
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}
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static void
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fetch_elfcore_registers (core_reg_sect, core_reg_size, which, ignore)
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char *core_reg_sect;
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unsigned core_reg_size;
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int which;
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CORE_ADDR ignore;
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{
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switch (which)
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{
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case 0: /* Integer registers */
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if (core_reg_size != sizeof (struct reg))
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warning ("Wrong size register set in core file.");
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else
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supply_regs (core_reg_sect);
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break;
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case 2: /* Floating point registers */
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if (core_reg_size != sizeof (struct fpreg))
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warning ("Wrong size FP register set in core file.");
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else
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supply_fpregs (core_reg_sect);
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break;
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default:
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/* Don't know what kind of register request this is; just ignore it. */
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break;
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}
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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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fetch_kcore_registers (pcbp)
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struct pcb *pcbp;
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{
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/* First clear out any garbage. */
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memset(registers, '\0', REGISTER_BYTES);
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/* SP */
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*(long *) ®isters[REGISTER_BYTE (SP_REGNUM)] =
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pcbp->pcb_hw.apcb_ksp;
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/* S0 through S6 */
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memcpy (®isters[REGISTER_BYTE (S0_REGNUM)],
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&pcbp->pcb_context[0], 7 * sizeof(long));
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/* PC */
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*(long *) ®isters[REGISTER_BYTE (PC_REGNUM)] =
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pcbp->pcb_context[7];
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registers_fetched ();
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}
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#endif /* FETCH_KCORE_REGISTERS */
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static struct core_fns alphanbsd_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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static struct core_fns alphanbsd_elfcore_fns =
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{
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bfd_target_elf_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_elfcore_registers, /* core_read_registers */
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NULL /* next */
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};
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void
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_initialize_alphanbsd_nat ()
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{
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add_core_fns (&alphanbsd_core_fns);
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add_core_fns (&alphanbsd_elfcore_fns);
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}
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