2886f8b253
* blockframe.c (get_prev_frame_info): If INIT_FRAME_PC_FIRST is set, run it before INIT_EXTRA_FRAME_INFO. * stack.c (frame_info): If PRINT_EXTRA_FRAME_INFO defined, call it. * mips-tdep.c (init_extra_frame_info): Only clobber the `frame' (FP) value in the frame_info struct if it is zero (as from top of execution stack). (setup_arbitrary_frame): Implement FRAME_SPECIFICATION_DYADIC. * mips-xdep.c (fetch_inferior_registers): ZERO_REGNUM always comes back as zero. So does FP_REGNUM, as a trigger for init_extra_frame_info. * tm-mips.h (INIT_FRAME_PC_FIRST): Kludge, FIXME, defined to get the program counter set before INIT_EXTRA_FRAME_INFO is run. (INIT_FRAME_PC): Defined to null. (PRINT_EXTRA_FRAME_INFO): print frame pointer location via symtab. (FRAME_SPECIFICATION_DYADIC): Ask for two args in frame command. Briefly explain MIPS stacks in GDB.
163 lines
4.2 KiB
C
163 lines
4.2 KiB
C
/* Low level MIPS interface to ptrace, for GDB when running under Unix.
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Copyright 1988, 1989, 1991, 1992 Free Software Foundation, Inc.
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Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU
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and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin.
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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., 675 Mass Ave, Cambridge, MA 02139, 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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/* For now we stub this out; sgi core format is super-hairy (and completely
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different in the new release).
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For most mips systems, this function is defined in coredep.c. */
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#if defined(sgi)
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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 int reg_addr;
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{
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return;
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}
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#endif
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/* Access to the inferior is only good for native systems, not cross.
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I am not sure why this is stubbed out on SGI... --gnu@cygnus.com */
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#if defined(sgi) || !defined(GDB_TARGET_IS_MIPS)
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/* ARGSUSED */
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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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return;
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}
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/* ARGSUSED */
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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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return;
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}
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#else
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/* DECstation native... */
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#include <sys/ptrace.h>
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/* Map gdb internal register number to ptrace ``address''.
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These ``addresses'' are defined in DECstation <sys/ptrace.h> */
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#define REGISTER_PTRACE_ADDR(regno) \
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(regno < 32 ? GPR_BASE + regno \
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: regno == PC_REGNUM ? PC \
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: regno == CAUSE_REGNUM ? CAUSE \
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: regno == HI_REGNUM ? MMHI \
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: regno == LO_REGNUM ? MMLO \
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: regno == FCRCS_REGNUM ? FPC_CSR \
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: regno == FCRIR_REGNUM ? FPC_EIR \
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: regno >= FP0_REGNUM ? FPR_BASE + (regno - FP0_REGNUM) \
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: 0)
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static const char zerobuf[MAX_REGISTER_RAW_SIZE];
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/* Get all registers from the inferior */
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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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register unsigned int regaddr;
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char buf[MAX_REGISTER_RAW_SIZE];
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register int i;
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registers_fetched ();
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for (regno = 1; regno < NUM_REGS; regno++)
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{
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regaddr = REGISTER_PTRACE_ADDR (regno);
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for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
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{
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*(int *) &buf[i] = ptrace (PT_READ_U, inferior_pid,
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(PTRACE_ARG3_TYPE) regaddr, 0);
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regaddr += sizeof (int);
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}
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supply_register (regno, buf);
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}
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supply_register (ZERO_REGNUM, zerobuf);
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/* Frame ptr reg must appear to be 0; it is faked by stack handling code. */
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supply_register (FP_REGNUM, zerobuf);
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}
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/* Store our register values back into the inferior.
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If REGNO is -1, do this for all registers.
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Otherwise, REGNO specifies which register (so we can save time). */
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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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register unsigned int regaddr;
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char buf[80];
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if (regno == 0)
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return;
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if (regno > 0)
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{
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regaddr = REGISTER_PTRACE_ADDR (regno);
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errno = 0;
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ptrace (PT_WRITE_U, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
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read_register (regno));
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if (errno != 0)
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{
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sprintf (buf, "writing register number %d", regno);
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perror_with_name (buf);
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}
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}
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else
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{
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for (regno = 0; regno < NUM_REGS; regno++)
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{
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if (regno == ZERO_REGNUM || regno == PS_REGNUM
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|| regno == BADVADDR_REGNUM || regno == CAUSE_REGNUM
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|| regno == FCRIR_REGNUM || regno == FP_REGNUM
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|| (regno >= FIRST_EMBED_REGNUM && regno <= LAST_EMBED_REGNUM))
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continue;
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regaddr = register_addr (regno, 1);
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errno = 0;
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ptrace (6, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
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read_register (regno));
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if (errno != 0)
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{
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sprintf (buf, "writing all regs, number %d", regno);
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perror_with_name (buf);
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}
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}
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}
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}
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#endif /* sgi */
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