676 lines
18 KiB
C
676 lines
18 KiB
C
/* IBM RS/6000 native-dependent code for GDB, the GNU debugger.
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Copyright (C) 1986-2018 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 3 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, see <http://www.gnu.org/licenses/>. */
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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 "symfile.h"
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#include "objfiles.h"
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#include "bfd.h"
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#include "gdb-stabs.h"
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#include "regcache.h"
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#include "arch-utils.h"
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#include "inf-child.h"
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#include "inf-ptrace.h"
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#include "ppc-tdep.h"
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#include "rs6000-tdep.h"
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#include "rs6000-aix-tdep.h"
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#include "exec.h"
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#include "observable.h"
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#include "xcoffread.h"
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#include <sys/ptrace.h>
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#include <sys/reg.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 <a.out.h>
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#include <sys/file.h>
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#include <sys/stat.h>
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#include "gdb_bfd.h"
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#include <sys/core.h>
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#define __LDINFO_PTRACE32__ /* for __ld_info32 */
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#define __LDINFO_PTRACE64__ /* for __ld_info64 */
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#include <sys/ldr.h>
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#include <sys/systemcfg.h>
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/* On AIX4.3+, sys/ldr.h provides different versions of struct ld_info for
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debugging 32-bit and 64-bit processes. Define a typedef and macros for
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accessing fields in the appropriate structures. */
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/* In 32-bit compilation mode (which is the only mode from which ptrace()
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works on 4.3), __ld_info32 is #defined as equivalent to ld_info. */
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#if defined (__ld_info32) || defined (__ld_info64)
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# define ARCH3264
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#endif
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/* Return whether the current architecture is 64-bit. */
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#ifndef ARCH3264
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# define ARCH64() 0
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#else
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# define ARCH64() (register_size (target_gdbarch (), 0) == 8)
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#endif
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class rs6000_nat_target final : public inf_ptrace_target
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{
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public:
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void fetch_registers (struct regcache *, int) override;
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void store_registers (struct regcache *, int) override;
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enum target_xfer_status xfer_partial (enum target_object object,
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const char *annex,
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gdb_byte *readbuf,
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const gdb_byte *writebuf,
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ULONGEST offset, ULONGEST len,
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ULONGEST *xfered_len) override;
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void create_inferior (const char *, const std::string &,
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char **, int) override;
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ptid_t wait (ptid_t, struct target_waitstatus *, int) override;
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private:
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enum target_xfer_status
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xfer_shared_libraries (enum target_object object,
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const char *annex, gdb_byte *readbuf,
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const gdb_byte *writebuf,
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ULONGEST offset, ULONGEST len,
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ULONGEST *xfered_len);
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};
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static rs6000_nat_target the_rs6000_nat_target;
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/* Given REGNO, a gdb register number, return the corresponding
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number suitable for use as a ptrace() parameter. Return -1 if
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there's no suitable mapping. Also, set the int pointed to by
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ISFLOAT to indicate whether REGNO is a floating point register. */
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static int
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regmap (struct gdbarch *gdbarch, int regno, int *isfloat)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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*isfloat = 0;
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if (tdep->ppc_gp0_regnum <= regno
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&& regno < tdep->ppc_gp0_regnum + ppc_num_gprs)
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return regno;
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else if (tdep->ppc_fp0_regnum >= 0
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&& tdep->ppc_fp0_regnum <= regno
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&& regno < tdep->ppc_fp0_regnum + ppc_num_fprs)
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{
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*isfloat = 1;
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return regno - tdep->ppc_fp0_regnum + FPR0;
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}
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else if (regno == gdbarch_pc_regnum (gdbarch))
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return IAR;
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else if (regno == tdep->ppc_ps_regnum)
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return MSR;
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else if (regno == tdep->ppc_cr_regnum)
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return CR;
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else if (regno == tdep->ppc_lr_regnum)
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return LR;
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else if (regno == tdep->ppc_ctr_regnum)
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return CTR;
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else if (regno == tdep->ppc_xer_regnum)
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return XER;
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else if (tdep->ppc_fpscr_regnum >= 0
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&& regno == tdep->ppc_fpscr_regnum)
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return FPSCR;
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else if (tdep->ppc_mq_regnum >= 0 && regno == tdep->ppc_mq_regnum)
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return MQ;
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else
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return -1;
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}
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/* Call ptrace(REQ, ID, ADDR, DATA, BUF). */
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static int
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rs6000_ptrace32 (int req, int id, int *addr, int data, int *buf)
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{
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#ifdef HAVE_PTRACE64
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int ret = ptrace64 (req, id, (uintptr_t) addr, data, buf);
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#else
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int ret = ptrace (req, id, (int *)addr, data, buf);
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#endif
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#if 0
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printf ("rs6000_ptrace32 (%d, %d, 0x%x, %08x, 0x%x) = 0x%x\n",
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req, id, (unsigned int)addr, data, (unsigned int)buf, ret);
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#endif
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return ret;
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}
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/* Call ptracex(REQ, ID, ADDR, DATA, BUF). */
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static int
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rs6000_ptrace64 (int req, int id, long long addr, int data, void *buf)
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{
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#ifdef ARCH3264
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# ifdef HAVE_PTRACE64
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int ret = ptrace64 (req, id, addr, data, (PTRACE_TYPE_ARG5) buf);
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# else
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int ret = ptracex (req, id, addr, data, (PTRACE_TYPE_ARG5) buf);
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# endif
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#else
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int ret = 0;
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#endif
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#if 0
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printf ("rs6000_ptrace64 (%d, %d, %s, %08x, 0x%x) = 0x%x\n",
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req, id, hex_string (addr), data, (unsigned int)buf, ret);
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#endif
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return ret;
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}
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/* Fetch register REGNO from the inferior. */
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static void
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fetch_register (struct regcache *regcache, int regno)
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{
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struct gdbarch *gdbarch = regcache->arch ();
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int addr[PPC_MAX_REGISTER_SIZE];
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int nr, isfloat;
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pid_t pid = regcache->ptid ().pid ();
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/* Retrieved values may be -1, so infer errors from errno. */
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errno = 0;
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nr = regmap (gdbarch, regno, &isfloat);
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/* Floating-point registers. */
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if (isfloat)
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rs6000_ptrace32 (PT_READ_FPR, pid, addr, nr, 0);
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/* Bogus register number. */
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else if (nr < 0)
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{
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if (regno >= gdbarch_num_regs (gdbarch))
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fprintf_unfiltered (gdb_stderr,
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"gdb error: register no %d not implemented.\n",
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regno);
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return;
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}
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/* Fixed-point registers. */
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else
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{
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if (!ARCH64 ())
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*addr = rs6000_ptrace32 (PT_READ_GPR, pid, (int *) nr, 0, 0);
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else
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{
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/* PT_READ_GPR requires the buffer parameter to point to long long,
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even if the register is really only 32 bits. */
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long long buf;
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rs6000_ptrace64 (PT_READ_GPR, pid, nr, 0, &buf);
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if (register_size (gdbarch, regno) == 8)
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memcpy (addr, &buf, 8);
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else
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*addr = buf;
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}
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}
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if (!errno)
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regcache->raw_supply (regno, (char *) addr);
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else
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{
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#if 0
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/* FIXME: this happens 3 times at the start of each 64-bit program. */
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perror (_("ptrace read"));
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#endif
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errno = 0;
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}
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}
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/* Store register REGNO back into the inferior. */
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static void
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store_register (struct regcache *regcache, int regno)
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{
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struct gdbarch *gdbarch = regcache->arch ();
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int addr[PPC_MAX_REGISTER_SIZE];
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int nr, isfloat;
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pid_t pid = regcache->ptid ().pid ();
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/* Fetch the register's value from the register cache. */
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regcache->raw_collect (regno, addr);
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/* -1 can be a successful return value, so infer errors from errno. */
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errno = 0;
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nr = regmap (gdbarch, regno, &isfloat);
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/* Floating-point registers. */
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if (isfloat)
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rs6000_ptrace32 (PT_WRITE_FPR, pid, addr, nr, 0);
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/* Bogus register number. */
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else if (nr < 0)
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{
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if (regno >= gdbarch_num_regs (gdbarch))
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fprintf_unfiltered (gdb_stderr,
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"gdb error: register no %d not implemented.\n",
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regno);
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}
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/* Fixed-point registers. */
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else
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{
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/* The PT_WRITE_GPR operation is rather odd. For 32-bit inferiors,
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the register's value is passed by value, but for 64-bit inferiors,
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the address of a buffer containing the value is passed. */
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if (!ARCH64 ())
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rs6000_ptrace32 (PT_WRITE_GPR, pid, (int *) nr, *addr, 0);
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else
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{
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/* PT_WRITE_GPR requires the buffer parameter to point to an 8-byte
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area, even if the register is really only 32 bits. */
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long long buf;
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if (register_size (gdbarch, regno) == 8)
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memcpy (&buf, addr, 8);
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else
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buf = *addr;
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rs6000_ptrace64 (PT_WRITE_GPR, pid, nr, 0, &buf);
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}
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}
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if (errno)
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{
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perror (_("ptrace write"));
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errno = 0;
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}
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}
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/* Read from the inferior all registers if REGNO == -1 and just register
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REGNO otherwise. */
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void
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rs6000_nat_target::fetch_registers (struct regcache *regcache, int regno)
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{
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struct gdbarch *gdbarch = regcache->arch ();
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if (regno != -1)
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fetch_register (regcache, regno);
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else
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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/* Read 32 general purpose registers. */
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for (regno = tdep->ppc_gp0_regnum;
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regno < tdep->ppc_gp0_regnum + ppc_num_gprs;
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regno++)
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{
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fetch_register (regcache, regno);
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}
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/* Read general purpose floating point registers. */
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if (tdep->ppc_fp0_regnum >= 0)
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for (regno = 0; regno < ppc_num_fprs; regno++)
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fetch_register (regcache, tdep->ppc_fp0_regnum + regno);
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/* Read special registers. */
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fetch_register (regcache, gdbarch_pc_regnum (gdbarch));
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fetch_register (regcache, tdep->ppc_ps_regnum);
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fetch_register (regcache, tdep->ppc_cr_regnum);
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fetch_register (regcache, tdep->ppc_lr_regnum);
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fetch_register (regcache, tdep->ppc_ctr_regnum);
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fetch_register (regcache, tdep->ppc_xer_regnum);
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if (tdep->ppc_fpscr_regnum >= 0)
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fetch_register (regcache, tdep->ppc_fpscr_regnum);
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if (tdep->ppc_mq_regnum >= 0)
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fetch_register (regcache, tdep->ppc_mq_regnum);
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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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rs6000_nat_target::store_registers (struct regcache *regcache, int regno)
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{
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struct gdbarch *gdbarch = regcache->arch ();
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if (regno != -1)
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store_register (regcache, regno);
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else
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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/* Write general purpose registers first. */
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for (regno = tdep->ppc_gp0_regnum;
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regno < tdep->ppc_gp0_regnum + ppc_num_gprs;
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regno++)
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{
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store_register (regcache, regno);
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}
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/* Write floating point registers. */
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if (tdep->ppc_fp0_regnum >= 0)
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for (regno = 0; regno < ppc_num_fprs; regno++)
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store_register (regcache, tdep->ppc_fp0_regnum + regno);
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/* Write special registers. */
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store_register (regcache, gdbarch_pc_regnum (gdbarch));
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store_register (regcache, tdep->ppc_ps_regnum);
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store_register (regcache, tdep->ppc_cr_regnum);
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store_register (regcache, tdep->ppc_lr_regnum);
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store_register (regcache, tdep->ppc_ctr_regnum);
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store_register (regcache, tdep->ppc_xer_regnum);
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if (tdep->ppc_fpscr_regnum >= 0)
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store_register (regcache, tdep->ppc_fpscr_regnum);
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if (tdep->ppc_mq_regnum >= 0)
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store_register (regcache, tdep->ppc_mq_regnum);
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}
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}
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/* Implement the to_xfer_partial target_ops method. */
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enum target_xfer_status
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rs6000_nat_target::xfer_partial (enum target_object object,
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const char *annex, gdb_byte *readbuf,
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const gdb_byte *writebuf,
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ULONGEST offset, ULONGEST len,
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ULONGEST *xfered_len)
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{
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pid_t pid = inferior_ptid.pid ();
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int arch64 = ARCH64 ();
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switch (object)
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{
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case TARGET_OBJECT_LIBRARIES_AIX:
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return xfer_shared_libraries (object, annex,
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readbuf, writebuf,
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offset, len, xfered_len);
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case TARGET_OBJECT_MEMORY:
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{
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union
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{
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PTRACE_TYPE_RET word;
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gdb_byte byte[sizeof (PTRACE_TYPE_RET)];
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} buffer;
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ULONGEST rounded_offset;
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LONGEST partial_len;
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/* Round the start offset down to the next long word
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boundary. */
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rounded_offset = offset & -(ULONGEST) sizeof (PTRACE_TYPE_RET);
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/* Since ptrace will transfer a single word starting at that
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rounded_offset the partial_len needs to be adjusted down to
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that (remember this function only does a single transfer).
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Should the required length be even less, adjust it down
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again. */
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partial_len = (rounded_offset + sizeof (PTRACE_TYPE_RET)) - offset;
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if (partial_len > len)
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partial_len = len;
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if (writebuf)
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{
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/* If OFFSET:PARTIAL_LEN is smaller than
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ROUNDED_OFFSET:WORDSIZE then a read/modify write will
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be needed. Read in the entire word. */
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if (rounded_offset < offset
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|| (offset + partial_len
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< rounded_offset + sizeof (PTRACE_TYPE_RET)))
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{
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/* Need part of initial word -- fetch it. */
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if (arch64)
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buffer.word = rs6000_ptrace64 (PT_READ_I, pid,
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rounded_offset, 0, NULL);
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else
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buffer.word = rs6000_ptrace32 (PT_READ_I, pid,
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(int *) (uintptr_t)
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rounded_offset,
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0, NULL);
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}
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/* Copy data to be written over corresponding part of
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buffer. */
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memcpy (buffer.byte + (offset - rounded_offset),
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writebuf, partial_len);
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errno = 0;
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if (arch64)
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rs6000_ptrace64 (PT_WRITE_D, pid,
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rounded_offset, buffer.word, NULL);
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else
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rs6000_ptrace32 (PT_WRITE_D, pid,
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(int *) (uintptr_t) rounded_offset,
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buffer.word, NULL);
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if (errno)
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return TARGET_XFER_EOF;
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}
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if (readbuf)
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{
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errno = 0;
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if (arch64)
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buffer.word = rs6000_ptrace64 (PT_READ_I, pid,
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rounded_offset, 0, NULL);
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else
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buffer.word = rs6000_ptrace32 (PT_READ_I, pid,
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(int *)(uintptr_t)rounded_offset,
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0, NULL);
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if (errno)
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return TARGET_XFER_EOF;
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/* Copy appropriate bytes out of the buffer. */
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memcpy (readbuf, buffer.byte + (offset - rounded_offset),
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partial_len);
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}
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*xfered_len = (ULONGEST) partial_len;
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return TARGET_XFER_OK;
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}
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default:
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return TARGET_XFER_E_IO;
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}
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}
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/* Wait for the child specified by PTID to do something. Return the
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process ID of the child, or MINUS_ONE_PTID in case of error; store
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the status in *OURSTATUS. */
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ptid_t
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rs6000_nat_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus,
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int options)
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{
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pid_t pid;
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int status, save_errno;
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do
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{
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set_sigint_trap ();
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do
|
||
{
|
||
pid = waitpid (ptid.pid (), &status, 0);
|
||
save_errno = errno;
|
||
}
|
||
while (pid == -1 && errno == EINTR);
|
||
|
||
clear_sigint_trap ();
|
||
|
||
if (pid == -1)
|
||
{
|
||
fprintf_unfiltered (gdb_stderr,
|
||
_("Child process unexpectedly missing: %s.\n"),
|
||
safe_strerror (save_errno));
|
||
|
||
/* Claim it exited with unknown signal. */
|
||
ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
|
||
ourstatus->value.sig = GDB_SIGNAL_UNKNOWN;
|
||
return inferior_ptid;
|
||
}
|
||
|
||
/* Ignore terminated detached child processes. */
|
||
if (!WIFSTOPPED (status) && pid != inferior_ptid.pid ())
|
||
pid = -1;
|
||
}
|
||
while (pid == -1);
|
||
|
||
/* AIX has a couple of strange returns from wait(). */
|
||
|
||
/* stop after load" status. */
|
||
if (status == 0x57c)
|
||
ourstatus->kind = TARGET_WAITKIND_LOADED;
|
||
/* signal 0. I have no idea why wait(2) returns with this status word. */
|
||
else if (status == 0x7f)
|
||
ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
|
||
/* A normal waitstatus. Let the usual macros deal with it. */
|
||
else
|
||
store_waitstatus (ourstatus, status);
|
||
|
||
return ptid_t (pid);
|
||
}
|
||
|
||
|
||
/* Set the current architecture from the host running GDB. Called when
|
||
starting a child process. */
|
||
|
||
void
|
||
rs6000_nat_target::create_inferior (const char *exec_file,
|
||
const std::string &allargs,
|
||
char **env, int from_tty)
|
||
{
|
||
enum bfd_architecture arch;
|
||
unsigned long mach;
|
||
bfd abfd;
|
||
struct gdbarch_info info;
|
||
|
||
inf_ptrace_target::create_inferior (exec_file, allargs, env, from_tty);
|
||
|
||
if (__power_rs ())
|
||
{
|
||
arch = bfd_arch_rs6000;
|
||
mach = bfd_mach_rs6k;
|
||
}
|
||
else
|
||
{
|
||
arch = bfd_arch_powerpc;
|
||
mach = bfd_mach_ppc;
|
||
}
|
||
|
||
/* FIXME: schauer/2002-02-25:
|
||
We don't know if we are executing a 32 or 64 bit executable,
|
||
and have no way to pass the proper word size to rs6000_gdbarch_init.
|
||
So we have to avoid switching to a new architecture, if the architecture
|
||
matches already.
|
||
Blindly calling rs6000_gdbarch_init used to work in older versions of
|
||
GDB, as rs6000_gdbarch_init incorrectly used the previous tdep to
|
||
determine the wordsize. */
|
||
if (exec_bfd)
|
||
{
|
||
const struct bfd_arch_info *exec_bfd_arch_info;
|
||
|
||
exec_bfd_arch_info = bfd_get_arch_info (exec_bfd);
|
||
if (arch == exec_bfd_arch_info->arch)
|
||
return;
|
||
}
|
||
|
||
bfd_default_set_arch_mach (&abfd, arch, mach);
|
||
|
||
gdbarch_info_init (&info);
|
||
info.bfd_arch_info = bfd_get_arch_info (&abfd);
|
||
info.abfd = exec_bfd;
|
||
|
||
if (!gdbarch_update_p (info))
|
||
internal_error (__FILE__, __LINE__,
|
||
_("rs6000_create_inferior: failed "
|
||
"to select architecture"));
|
||
}
|
||
|
||
|
||
/* Shared Object support. */
|
||
|
||
/* Return the LdInfo data for the given process. Raises an error
|
||
if the data could not be obtained. */
|
||
|
||
static gdb::byte_vector
|
||
rs6000_ptrace_ldinfo (ptid_t ptid)
|
||
{
|
||
const int pid = ptid.pid ();
|
||
gdb::byte_vector ldi (1024);
|
||
int rc = -1;
|
||
|
||
while (1)
|
||
{
|
||
if (ARCH64 ())
|
||
rc = rs6000_ptrace64 (PT_LDINFO, pid, (unsigned long) ldi.data (),
|
||
ldi.size (), NULL);
|
||
else
|
||
rc = rs6000_ptrace32 (PT_LDINFO, pid, (int *) ldi.data (),
|
||
ldi.size (), NULL);
|
||
|
||
if (rc != -1)
|
||
break; /* Success, we got the entire ld_info data. */
|
||
|
||
if (errno != ENOMEM)
|
||
perror_with_name (_("ptrace ldinfo"));
|
||
|
||
/* ldi is not big enough. Double it and try again. */
|
||
ldi.resize (ldi.size () * 2);
|
||
}
|
||
|
||
return ldi;
|
||
}
|
||
|
||
/* Implement the to_xfer_partial target_ops method for
|
||
TARGET_OBJECT_LIBRARIES_AIX objects. */
|
||
|
||
enum target_xfer_status
|
||
rs6000_nat_target::xfer_shared_libraries
|
||
(enum target_object object,
|
||
const char *annex, gdb_byte *readbuf, const gdb_byte *writebuf,
|
||
ULONGEST offset, ULONGEST len, ULONGEST *xfered_len)
|
||
{
|
||
ULONGEST result;
|
||
|
||
/* This function assumes that it is being run with a live process.
|
||
Core files are handled via gdbarch. */
|
||
gdb_assert (target_has_execution);
|
||
|
||
if (writebuf)
|
||
return TARGET_XFER_E_IO;
|
||
|
||
gdb::byte_vector ldi_buf = rs6000_ptrace_ldinfo (inferior_ptid);
|
||
result = rs6000_aix_ld_info_to_xml (target_gdbarch (), ldi_buf.data (),
|
||
readbuf, offset, len, 1);
|
||
|
||
if (result == 0)
|
||
return TARGET_XFER_EOF;
|
||
else
|
||
{
|
||
*xfered_len = result;
|
||
return TARGET_XFER_OK;
|
||
}
|
||
}
|
||
|
||
void
|
||
_initialize_rs6000_nat (void)
|
||
{
|
||
add_inf_child_target (&the_rs6000_nat_target);
|
||
}
|