364 lines
9.5 KiB
C
364 lines
9.5 KiB
C
/* IBM RS/6000 host-dependent code for GDB, the GNU debugger.
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Copyright (C) 1986, 1987, 1989, 1991 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include <stdio.h>
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#include "defs.h"
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#include "frame.h"
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#include "inferior.h"
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#include "symtab.h"
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#include "target.h"
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#include <sys/param.h>
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#include <sys/dir.h>
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#include <sys/user.h>
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#include <signal.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#include <sys/ptrace.h>
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#include <sys/reg.h>
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#include <a.out.h>
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#include <sys/file.h>
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#include <sys/stat.h>
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#include <sys/core.h>
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#include <sys/ldr.h>
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extern int errno;
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extern int attach_flag;
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/* Conversion from gdb-to-system special purpose register numbers.. */
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static int special_regs[] = {
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IAR, /* PC_REGNUM */
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MSR, /* PS_REGNUM */
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CR, /* CR_REGNUM */
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LR, /* LR_REGNUM */
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CTR, /* CTR_REGNUM */
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XER, /* XER_REGNUM */
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MQ /* MQ_REGNUM */
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};
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/* Nonzero if we just simulated a single step break. */
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extern int one_stepped;
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fetch_inferior_registers ()
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{
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int ii;
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extern char registers[];
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/* read 32 general purpose registers. */
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for (ii=0; ii < 32; ++ii)
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*(int*)®isters[REGISTER_BYTE (ii)] =
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ptrace (PT_READ_GPR, inferior_pid, ii, 0, 0);
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/* read general purpose floating point registers. */
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for (ii=0; ii < 32; ++ii)
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ptrace (PT_READ_FPR, inferior_pid,
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(int*)®isters [REGISTER_BYTE (FP0_REGNUM+ii)], FPR0+ii, 0);
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/* read special registers. */
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for (ii=0; ii <= LAST_SP_REGNUM-FIRST_SP_REGNUM; ++ii)
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*(int*)®isters[REGISTER_BYTE (FIRST_SP_REGNUM+ii)] =
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ptrace (PT_READ_GPR, inferior_pid, special_regs[ii], 0, 0);
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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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store_inferior_registers (regno)
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int regno;
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{
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extern char registers[];
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errno = 0;
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if (regno == -1) { /* for all registers.. */
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int ii;
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/* execute one dummy instruction (which is a breakpoint) in inferior
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process. So give kernel a chance to do internal house keeping.
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Otherwise the following ptrace(2) calls will mess up user stack
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since kernel will get confused about the bottom of the stack (%sp) */
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exec_one_dummy_insn ();
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/* write general purpose registers first! */
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for ( ii=GPR0; ii<=GPR31; ++ii) {
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ptrace (PT_WRITE_GPR, inferior_pid, ii,
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*(int*)®isters[REGISTER_BYTE (ii)], 0);
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if ( errno ) {
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perror ("ptrace write_gpr"); errno = 0;
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}
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}
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/* write floating point registers now. */
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for ( ii=0; ii < 32; ++ii) {
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ptrace (PT_WRITE_FPR, inferior_pid,
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(int*)®isters[REGISTER_BYTE (FP0_REGNUM+ii)], FPR0+ii, 0);
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if ( errno ) {
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perror ("ptrace write_fpr"); errno = 0;
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}
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}
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/* write special registers. */
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for (ii=0; ii <= LAST_SP_REGNUM-FIRST_SP_REGNUM; ++ii) {
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ptrace (PT_WRITE_GPR, inferior_pid, special_regs[ii],
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*(int*)®isters[REGISTER_BYTE (FIRST_SP_REGNUM+ii)], 0);
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if ( errno ) {
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perror ("ptrace write_gpr"); errno = 0;
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}
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}
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}
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/* else, a specific register number is given... */
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else if (regno < FP0_REGNUM) { /* a GPR */
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ptrace (PT_WRITE_GPR, inferior_pid, regno,
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*(int*)®isters[REGISTER_BYTE (regno)], 0);
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}
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else if (regno <= FPLAST_REGNUM) { /* a FPR */
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ptrace (PT_WRITE_FPR, inferior_pid,
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(int*)®isters[REGISTER_BYTE (regno)], regno-FP0_REGNUM+FPR0, 0);
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}
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else if (regno <= LAST_SP_REGNUM) { /* a special register */
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ptrace (PT_WRITE_GPR, inferior_pid, special_regs [regno-FIRST_SP_REGNUM],
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*(int*)®isters[REGISTER_BYTE (regno)], 0);
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}
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else
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fprintf (stderr, "Gdb error: register no %d not implemented.\n", regno);
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if ( errno ) {
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perror ("ptrace write"); errno = 0;
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return -1;
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}
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return 0;
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}
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void
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fetch_core_registers (core_reg_sect, core_reg_size, which)
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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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{
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/* fetch GPRs and special registers from the first register section
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in core bfd. */
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if (which == 0) {
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/* copy GPRs first. */
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bcopy (core_reg_sect, registers, 32 * 4);
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/* gdb's internal register template and bfd's register section layout
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should share a common include file. FIXMEmgo */
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/* then comes special registes. They are supposed to be in the same
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order in gdb template and bfd `.reg' section. */
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core_reg_sect += (32 * 4);
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bcopy (core_reg_sect, ®isters [REGISTER_BYTE (FIRST_SP_REGNUM)],
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(LAST_SP_REGNUM - FIRST_SP_REGNUM + 1) * 4);
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}
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/* fetch floating point registers from register section 2 in core bfd. */
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else if (which == 2)
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bcopy (core_reg_sect, ®isters [REGISTER_BYTE (FP0_REGNUM)], 32 * 8);
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else
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fprintf (stderr, "Gdb error: unknown parameter to fetch_core_registers().\n");
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}
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frameless_function_invocation (fi)
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struct frame_info *fi;
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{
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int ret;
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CORE_ADDR func_start, after_prologue;
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#if 0
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func_start = (LOAD_ADDR (get_pc_function_start (fi->pc)) +
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FUNCTION_START_OFFSET);
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#else
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func_start = get_pc_function_start (fi->pc) + FUNCTION_START_OFFSET;
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#endif
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if (func_start)
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{
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after_prologue = func_start;
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SKIP_PROLOGUE (after_prologue);
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ret = (after_prologue == func_start);
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}
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else
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/* If we can't find the start of the function, we don't really */
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/* know whether the function is frameless, but we should be */
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/* able to get a reasonable (i.e. best we can do under the */
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/* circumstances) backtrace by saying that it isn't. */
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ret = 0;
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return ret;
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}
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/* aixcoff_relocate_symtab - hook for symbol table relocation.
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also reads shared libraries.. */
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aixcoff_relocate_symtab (pid)
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unsigned int pid;
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{
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#define MAX_LOAD_SEGS 64 /* maximum number of load segments */
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extern int compare_misc_functions ();
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struct ld_info *ldi;
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int temp;
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ldi = (void *) alloca(MAX_LOAD_SEGS * sizeof (*ldi));
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/* According to my humble theory, aixcoff has some timing problems and
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when the user stack grows, kernel doesn't update stack info in time
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and ptrace calls step on user stack. That is why we sleep here a little,
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and give kernel to update its internals. */
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usleep (36000);
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errno = 0;
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ptrace(PT_LDINFO, pid, ldi, MAX_LOAD_SEGS * sizeof(*ldi), ldi);
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if (errno)
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perror_with_name ("ptrace ldinfo");
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vmap_ldinfo(ldi);
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do {
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add_text_to_loadinfo (ldi->ldinfo_textorg, ldi->ldinfo_dataorg);
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} while (ldi->ldinfo_next
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&& (ldi = (void *) (ldi->ldinfo_next + (char *) ldi)));
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/* Now that we've jumbled things around, re-sort them. */
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sort_misc_function_vector ();
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/* relocate the exec and core sections as well. */
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vmap_exec ();
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}
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/* Keep an array of load segment information and their TOC table addresses.
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This info will be useful when calling a shared library function by hand. */
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typedef struct {
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unsigned long textorg, dataorg, toc_offset;
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} LoadInfo;
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#define LOADINFOLEN 10
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static LoadInfo *loadInfo = NULL;
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static int loadInfoLen = 0;
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static int loadInfoTocIndex = 0;
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static int loadInfoTextIndex = 0;
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xcoff_init_loadinfo ()
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{
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loadInfoTocIndex = 0;
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loadInfoTextIndex = 0;
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if (loadInfoLen == 0) {
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loadInfo = (void*) xmalloc (sizeof (LoadInfo) * LOADINFOLEN);
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loadInfoLen = LOADINFOLEN;
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}
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}
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free_loadinfo ()
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{
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if (loadInfo)
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free (loadInfo);
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loadInfo = NULL;
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loadInfoLen = 0;
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loadInfoTocIndex = 0;
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loadInfoTextIndex = 0;
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}
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xcoff_add_toc_to_loadinfo (unsigned long tocaddr)
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{
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while (loadInfoTocIndex >= loadInfoLen) {
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loadInfoLen += LOADINFOLEN;
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loadInfo = (void*) xrealloc (loadInfo, sizeof(LoadInfo) * loadInfoLen);
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}
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loadInfo [loadInfoTocIndex++].toc_offset = tocaddr;
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}
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add_text_to_loadinfo (unsigned long textaddr, unsigned long dataaddr)
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{
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while (loadInfoTextIndex >= loadInfoLen) {
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loadInfoLen += LOADINFOLEN;
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loadInfo = (void*) xrealloc (loadInfo, sizeof(LoadInfo) * loadInfoLen);
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}
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loadInfo [loadInfoTextIndex].textorg = textaddr;
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loadInfo [loadInfoTextIndex].dataorg = dataaddr;
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++loadInfoTextIndex;
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}
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unsigned long
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find_toc_address (unsigned long pc)
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{
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int ii, toc_entry;
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for (ii=0; ii < loadInfoTextIndex; ++ii)
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if (pc > loadInfo [ii].textorg)
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toc_entry = ii;
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return loadInfo [toc_entry].dataorg + loadInfo [toc_entry].toc_offset;
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}
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/* execute one dummy breakpoint instruction. This way we give kernel
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a chance to do some housekeeping and update inferior's internal data,
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including u_area. */
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exec_one_dummy_insn ()
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{
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#define DUMMY_INSN_ADDR 0x10000200
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unsigned long shadow;
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unsigned int status, pid;
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target_insert_breakpoint (DUMMY_INSN_ADDR, &shadow);
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errno = 0;
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ptrace (PT_CONTINUE, inferior_pid, DUMMY_INSN_ADDR, 0, 0);
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if (errno)
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perror ("pt_continue");
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do {
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pid = wait (&status);
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} while (pid != inferior_pid);
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target_remove_breakpoint (DUMMY_INSN_ADDR, &shadow);
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}
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