385 lines
13 KiB
C
385 lines
13 KiB
C
/* Functions specific to running gdb native on a SPARC running SunOS4.
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Copyright 1989, 1992, 1993, 1994, 1996, 1997, 1998, 1999, 2000,
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2001, 2002, 2003 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 "target.h"
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#include "gdbcore.h"
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#include "regcache.h"
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#include "sparc-tdep.h"
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#ifdef HAVE_SYS_PARAM_H
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#include <sys/param.h>
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#endif
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#include <signal.h>
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#include <sys/ptrace.h>
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#include "gdb_wait.h"
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#ifdef __linux__
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#include <asm/reg.h>
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#else
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#include <machine/reg.h>
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#endif
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#include <sys/user.h>
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/* We don't store all registers immediately when requested, since they
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get sent over in large chunks anyway. Instead, we accumulate most
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of the changes and send them over once. "deferred_stores" keeps
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track of which sets of registers we have locally-changed copies of,
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so we only need send the groups that have changed. */
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#define INT_REGS 1
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#define STACK_REGS 2
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#define FP_REGS 4
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/* Fetch one or more registers from the inferior. REGNO == -1 to get
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them all. We actually fetch more than requested, when convenient,
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marking them as valid so we won't fetch them again. */
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void
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fetch_inferior_registers (int regno)
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{
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struct regs inferior_registers;
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struct fp_status inferior_fp_registers;
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int i;
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int fetch_pid;
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/* NOTE: cagney/2002-12-03: This code assumes that the currently
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selected light weight processes' registers can be written
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directly into the selected thread's register cache. This works
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fine when given an 1:1 LWP:thread model (such as found on
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GNU/Linux) but will, likely, have problems when used on an N:1
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(userland threads) or N:M (userland multiple LWP) model. In the
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case of the latter two, the LWP's registers do not necessarily
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belong to the selected thread (the LWP could be in the middle of
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executing the thread switch code).
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These functions should instead be paramaterized with an explicit
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object (struct regcache, struct thread_info?) into which the LWPs
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registers can be written. */
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fetch_pid = TIDGET (inferior_ptid);
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if (fetch_pid == 0)
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fetch_pid = PIDGET (inferior_ptid);
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/* We should never be called with deferred stores, because a prerequisite
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for writing regs is to have fetched them all (PREPARE_TO_STORE), sigh. */
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if (deferred_stores)
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internal_error (__FILE__, __LINE__, "failed internal consistency check");
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DO_DEFERRED_STORES;
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/* Global and Out regs are fetched directly, as well as the control
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registers. If we're getting one of the in or local regs,
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and the stack pointer has not yet been fetched,
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we have to do that first, since they're found in memory relative
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to the stack pointer. */
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if (regno < O7_REGNUM /* including -1 */
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|| regno >= Y_REGNUM
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|| (!deprecated_register_valid[SP_REGNUM] && regno < I7_REGNUM))
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{
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if (0 != ptrace (PTRACE_GETREGS, fetch_pid,
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(PTRACE_ARG3_TYPE) & inferior_registers, 0))
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perror ("ptrace_getregs");
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deprecated_registers[REGISTER_BYTE (0)] = 0;
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memcpy (&deprecated_registers[REGISTER_BYTE (1)],
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&inferior_registers.r_g1, 15 * REGISTER_RAW_SIZE (G0_REGNUM));
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*(int *) &deprecated_registers[REGISTER_BYTE (PS_REGNUM)]
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= inferior_registers.r_ps;
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*(int *) &deprecated_registers[REGISTER_BYTE (PC_REGNUM)]
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= inferior_registers.r_pc;
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*(int *) &deprecated_registers[REGISTER_BYTE (NPC_REGNUM)]
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= inferior_registers.r_npc;
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*(int *) &deprecated_registers[REGISTER_BYTE (Y_REGNUM)] = inferior_registers.r_y;
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for (i = G0_REGNUM; i <= O7_REGNUM; i++)
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deprecated_register_valid[i] = 1;
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deprecated_register_valid[Y_REGNUM] = 1;
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deprecated_register_valid[PS_REGNUM] = 1;
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deprecated_register_valid[PC_REGNUM] = 1;
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deprecated_register_valid[NPC_REGNUM] = 1;
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/* If we don't set these valid, read_register_bytes() rereads
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all the regs every time it is called! FIXME. */
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deprecated_register_valid[WIM_REGNUM] = 1; /* Not true yet, FIXME */
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deprecated_register_valid[TBR_REGNUM] = 1; /* Not true yet, FIXME */
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deprecated_register_valid[CPS_REGNUM] = 1; /* Not true yet, FIXME */
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}
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/* Floating point registers */
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if (regno == -1 ||
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regno == FPS_REGNUM ||
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(regno >= FP0_REGNUM && regno <= FP0_REGNUM + 31))
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{
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if (0 != ptrace (PTRACE_GETFPREGS, fetch_pid,
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(PTRACE_ARG3_TYPE) & inferior_fp_registers,
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0))
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perror ("ptrace_getfpregs");
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memcpy (&deprecated_registers[REGISTER_BYTE (FP0_REGNUM)],
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&inferior_fp_registers, sizeof inferior_fp_registers.fpu_fr);
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memcpy (&deprecated_registers[REGISTER_BYTE (FPS_REGNUM)],
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&inferior_fp_registers.Fpu_fsr, sizeof (FPU_FSR_TYPE));
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for (i = FP0_REGNUM; i <= FP0_REGNUM + 31; i++)
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deprecated_register_valid[i] = 1;
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deprecated_register_valid[FPS_REGNUM] = 1;
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}
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/* These regs are saved on the stack by the kernel. Only read them
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all (16 ptrace calls!) if we really need them. */
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if (regno == -1)
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{
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CORE_ADDR sp = *(unsigned int *) & deprecated_registers[REGISTER_BYTE (SP_REGNUM)];
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target_read_memory (sp, &deprecated_registers[REGISTER_BYTE (L0_REGNUM)],
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16 * REGISTER_RAW_SIZE (L0_REGNUM));
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for (i = L0_REGNUM; i <= I7_REGNUM; i++)
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deprecated_register_valid[i] = 1;
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}
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else if (regno >= L0_REGNUM && regno <= I7_REGNUM)
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{
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CORE_ADDR sp = *(unsigned int *) & deprecated_registers[REGISTER_BYTE (SP_REGNUM)];
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i = REGISTER_BYTE (regno);
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if (deprecated_register_valid[regno])
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printf_unfiltered ("register %d valid and read\n", regno);
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target_read_memory (sp + i - REGISTER_BYTE (L0_REGNUM),
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&deprecated_registers[i], REGISTER_RAW_SIZE (regno));
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deprecated_register_valid[regno] = 1;
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}
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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 (int regno)
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{
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struct regs inferior_registers;
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struct fp_status inferior_fp_registers;
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int wanna_store = INT_REGS + STACK_REGS + FP_REGS;
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int store_pid;
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/* NOTE: cagney/2002-12-02: See comment in fetch_inferior_registers
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about threaded assumptions. */
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store_pid = TIDGET (inferior_ptid);
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if (store_pid == 0)
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store_pid = PIDGET (inferior_ptid);
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/* First decide which pieces of machine-state we need to modify.
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Default for regno == -1 case is all pieces. */
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if (regno >= 0)
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{
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if (FP0_REGNUM <= regno && regno < FP0_REGNUM + 32)
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{
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wanna_store = FP_REGS;
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}
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else
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{
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if (regno == SP_REGNUM)
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wanna_store = INT_REGS + STACK_REGS;
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else if (regno < L0_REGNUM || regno > I7_REGNUM)
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wanna_store = INT_REGS;
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else if (regno == FPS_REGNUM)
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wanna_store = FP_REGS;
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else
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wanna_store = STACK_REGS;
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}
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}
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/* See if we're forcing the stores to happen now, or deferring. */
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if (regno == -2)
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{
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wanna_store = deferred_stores;
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deferred_stores = 0;
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}
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else
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{
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if (wanna_store == STACK_REGS)
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{
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/* Fall through and just store one stack reg. If we deferred
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it, we'd have to store them all, or remember more info. */
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}
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else
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{
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deferred_stores |= wanna_store;
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return;
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}
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}
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if (wanna_store & STACK_REGS)
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{
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CORE_ADDR sp = *(unsigned int *) & deprecated_registers[REGISTER_BYTE (SP_REGNUM)];
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if (regno < 0 || regno == SP_REGNUM)
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{
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if (!deprecated_register_valid[L0_REGNUM + 5])
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internal_error (__FILE__, __LINE__, "failed internal consistency check");
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target_write_memory (sp,
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&deprecated_registers[REGISTER_BYTE (L0_REGNUM)],
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16 * REGISTER_RAW_SIZE (L0_REGNUM));
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}
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else
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{
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if (!deprecated_register_valid[regno])
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internal_error (__FILE__, __LINE__, "failed internal consistency check");
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target_write_memory (sp + REGISTER_BYTE (regno) - REGISTER_BYTE (L0_REGNUM),
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&deprecated_registers[REGISTER_BYTE (regno)],
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REGISTER_RAW_SIZE (regno));
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}
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}
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if (wanna_store & INT_REGS)
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{
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if (!deprecated_register_valid[G1_REGNUM])
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internal_error (__FILE__, __LINE__, "failed internal consistency check");
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memcpy (&inferior_registers.r_g1,
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&deprecated_registers[REGISTER_BYTE (G1_REGNUM)],
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15 * REGISTER_RAW_SIZE (G1_REGNUM));
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inferior_registers.r_ps =
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*(int *) &deprecated_registers[REGISTER_BYTE (PS_REGNUM)];
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inferior_registers.r_pc =
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*(int *) &deprecated_registers[REGISTER_BYTE (PC_REGNUM)];
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inferior_registers.r_npc =
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*(int *) &deprecated_registers[REGISTER_BYTE (NPC_REGNUM)];
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inferior_registers.r_y =
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*(int *) &deprecated_registers[REGISTER_BYTE (Y_REGNUM)];
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if (0 != ptrace (PTRACE_SETREGS, store_pid,
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(PTRACE_ARG3_TYPE) & inferior_registers, 0))
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perror ("ptrace_setregs");
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}
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if (wanna_store & FP_REGS)
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{
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if (!deprecated_register_valid[FP0_REGNUM + 9])
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internal_error (__FILE__, __LINE__, "failed internal consistency check");
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memcpy (&inferior_fp_registers,
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&deprecated_registers[REGISTER_BYTE (FP0_REGNUM)],
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sizeof inferior_fp_registers.fpu_fr);
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memcpy (&inferior_fp_registers.Fpu_fsr,
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&deprecated_registers[REGISTER_BYTE (FPS_REGNUM)],
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sizeof (FPU_FSR_TYPE));
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if (0 !=
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ptrace (PTRACE_SETFPREGS, store_pid,
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(PTRACE_ARG3_TYPE) & inferior_fp_registers, 0))
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perror ("ptrace_setfpregs");
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}
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}
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/* Provide registers to GDB from a core file.
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CORE_REG_SECT points to an array of bytes, which are the contents
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of a `note' from a core file which BFD thinks might contain
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register contents. CORE_REG_SIZE is its size.
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WHICH says which register set corelow suspects this is:
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0 --- the general-purpose register set
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2 --- the floating-point register set
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IGNORE is unused. */
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static void
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fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
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int which, CORE_ADDR ignore)
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{
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if (which == 0)
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{
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/* Integer registers */
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#define gregs ((struct regs *)core_reg_sect)
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/* G0 *always* holds 0. */
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*(int *) &deprecated_registers[REGISTER_BYTE (0)] = 0;
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/* The globals and output registers. */
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memcpy (&deprecated_registers[REGISTER_BYTE (G1_REGNUM)], &gregs->r_g1,
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15 * REGISTER_RAW_SIZE (G1_REGNUM));
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*(int *) &deprecated_registers[REGISTER_BYTE (PS_REGNUM)] = gregs->r_ps;
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*(int *) &deprecated_registers[REGISTER_BYTE (PC_REGNUM)] = gregs->r_pc;
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*(int *) &deprecated_registers[REGISTER_BYTE (NPC_REGNUM)] = gregs->r_npc;
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*(int *) &deprecated_registers[REGISTER_BYTE (Y_REGNUM)] = gregs->r_y;
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/* My best guess at where to get the locals and input
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registers is exactly where they usually are, right above
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the stack pointer. If the core dump was caused by a bus error
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from blowing away the stack pointer (as is possible) then this
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won't work, but it's worth the try. */
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{
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int sp;
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sp = *(int *) &deprecated_registers[REGISTER_BYTE (SP_REGNUM)];
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if (0 != target_read_memory (sp,
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&deprecated_registers[REGISTER_BYTE (L0_REGNUM)],
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16 * REGISTER_RAW_SIZE (L0_REGNUM)))
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{
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/* fprintf_unfiltered so user can still use gdb */
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fprintf_unfiltered (gdb_stderr,
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"Couldn't read input and local registers from core file\n");
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}
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}
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}
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else if (which == 2)
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{
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/* Floating point registers */
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#define fpuregs ((struct fpu *) core_reg_sect)
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if (core_reg_size >= sizeof (struct fpu))
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{
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memcpy (&deprecated_registers[REGISTER_BYTE (FP0_REGNUM)],
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fpuregs->fpu_regs, sizeof (fpuregs->fpu_regs));
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memcpy (&deprecated_registers[REGISTER_BYTE (FPS_REGNUM)],
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&fpuregs->fpu_fsr, sizeof (FPU_FSR_TYPE));
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}
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else
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fprintf_unfiltered (gdb_stderr, "Couldn't read float regs from core file\n");
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}
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}
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int
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kernel_u_size (void)
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{
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return (sizeof (struct user));
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}
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/* Register that we are able to handle sparc core file formats.
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FIXME: is this really bfd_target_unknown_flavour? */
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static struct core_fns sparc_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_core_sparc (void)
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{
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add_core_fns (&sparc_core_fns);
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}
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