247 lines
7.0 KiB
C
247 lines
7.0 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, Boston, MA 02111-1307, USA.
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This file was developed by Gordon W. Ross <gwr@netbsd.org>
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as a derivation from alpha-nat.c and m68knbsd-nat.c. */
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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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/* Extract the register values out of the core file and store
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them where `read_register' will find them.
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CORE_REG_SECT points to the register values themselves, read into memory.
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CORE_REG_SIZE is the size of that area.
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WHICH says which set of registers we are handling (0 = int, 2 = float
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on machines where they are discontiguous).
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REG_ADDR is the offset from u.u_ar0 to the register values relative to
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core_reg_sect. This is used with old-fashioned core files to
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locate the registers in a large upage-plus-stack ".reg" section.
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Original upage address X is at location core_reg_sect+x+reg_addr.
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*/
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static void
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fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
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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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unsigned reg_addr;
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{
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struct md_coredump *core_reg;
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struct trapframe *tf;
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struct fpreg *fs;
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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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tf = &core_reg->md_tf;
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fs = &core_reg->md_fpstate;
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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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*(long *) ®isters[REGISTER_BYTE (regnum)] = tf->tf_regs[regnum];
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*(long *) ®isters[REGISTER_BYTE (ZERO_REGNUM)] = 0;
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/* Floating point registers */
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memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)],
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&fs->fpr_regs[0], sizeof(fs->fpr_regs));
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/* Special registers (PC, VFP) */
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*(long *) ®isters[REGISTER_BYTE (PC_REGNUM)] = tf->tf_regs[FRAME_PC];
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*(long *) ®isters[REGISTER_BYTE (FP_REGNUM)] = 0;
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registers_fetched ();
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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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/* Integer registers */
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ptrace (PT_GETREGS, inferior_pid,
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(PTRACE_ARG3_TYPE) &inferior_registers, 0);
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/* The PC travels in the R_ZERO slot. */
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*(long *) ®isters[REGISTER_BYTE (PC_REGNUM)] =
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inferior_registers.r_regs[R_ZERO];
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inferior_registers.r_regs[R_ZERO] = 0;
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memcpy (®isters[REGISTER_BYTE (0)],
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&inferior_registers.r_regs[0],
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sizeof(inferior_registers.r_regs));
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/* Floating point registers */
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ptrace (PT_GETFPREGS, inferior_pid,
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(PTRACE_ARG3_TYPE) &inferior_fp_registers, 0);
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memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)],
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&inferior_fp_registers.fpr_regs[0],
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sizeof(inferior_fp_registers.fpr_regs));
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registers_fetched ();
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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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/* Integer registers */
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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, inferior_pid,
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(PTRACE_ARG3_TYPE) &inferior_registers, 0);
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/* Floating point registers */
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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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inferior_fp_registers.fpr_cr = 0;
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ptrace (PT_SETFPREGS, inferior_pid,
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(PTRACE_ARG3_TYPE) &inferior_fp_registers, 0);
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registers_fetched ();
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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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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_ecoff_flavour,
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fetch_core_registers,
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NULL
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};
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static struct core_fns alphanbsd_elf_core_fns =
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{
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bfd_target_elf_flavour,
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fetch_core_registers,
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NULL
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};
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void
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_initialize_core_alphanbsd ()
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{
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add_core_fns (&alphanbsd_core_fns);
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add_core_fns (&alphanbsd_elf_core_fns);
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}
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