506 lines
14 KiB
C
506 lines
14 KiB
C
/* S390 native-dependent code for GDB, the GNU debugger.
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Copyright (C) 2001, 2003, 2004, 2005, 2006, 2007, 2009
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Free Software Foundation, Inc
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Contributed by D.J. Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
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for IBM Deutschland Entwicklung GmbH, IBM Corporation.
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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 "regcache.h"
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#include "inferior.h"
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#include "target.h"
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#include "linux-nat.h"
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#include "auxv.h"
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#include "s390-tdep.h"
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#include <asm/ptrace.h>
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#include <sys/ptrace.h>
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#include <asm/types.h>
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#include <sys/procfs.h>
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#include <sys/ucontext.h>
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#include <elf.h>
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#ifndef HWCAP_S390_HIGH_GPRS
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#define HWCAP_S390_HIGH_GPRS 512
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#endif
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/* Map registers to gregset/ptrace offsets.
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These arrays are defined in s390-tdep.c. */
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#ifdef __s390x__
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#define regmap_gregset s390x_regmap_gregset
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#else
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#define regmap_gregset s390_regmap_gregset
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#endif
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#define regmap_fpregset s390_regmap_fpregset
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/* When debugging a 32-bit executable running under a 64-bit kernel,
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we have to fix up the 64-bit registers we get from the kernel
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to make them look like 32-bit registers. */
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#ifdef __s390x__
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#define SUBOFF(gdbarch, i) \
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((gdbarch_ptr_bit (gdbarch) == 32 \
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&& ((i) == S390_PSWA_REGNUM \
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|| ((i) >= S390_R0_REGNUM && (i) <= S390_R15_REGNUM)))? 4 : 0)
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#else
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#define SUBOFF(gdbarch, i) 0
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#endif
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/* Fill GDB's register array with the general-purpose register values
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in *REGP. */
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void
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supply_gregset (struct regcache *regcache, const gregset_t *regp)
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{
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struct gdbarch *gdbarch = get_regcache_arch (regcache);
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int i;
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for (i = 0; i < S390_NUM_REGS; i++)
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if (regmap_gregset[i] != -1)
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regcache_raw_supply (regcache, i,
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(const char *)regp + regmap_gregset[i]
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+ SUBOFF (gdbarch, i));
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}
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/* Fill register REGNO (if it is a general-purpose register) in
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*REGP with the value in GDB's register array. If REGNO is -1,
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do this for all registers. */
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void
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fill_gregset (const struct regcache *regcache, gregset_t *regp, int regno)
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{
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struct gdbarch *gdbarch = get_regcache_arch (regcache);
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int i;
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for (i = 0; i < S390_NUM_REGS; i++)
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if (regmap_gregset[i] != -1)
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if (regno == -1 || regno == i)
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regcache_raw_collect (regcache, i,
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(char *)regp + regmap_gregset[i]
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+ SUBOFF (gdbarch, i));
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}
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/* Fill GDB's register array with the floating-point register values
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in *REGP. */
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void
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supply_fpregset (struct regcache *regcache, const fpregset_t *regp)
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{
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int i;
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for (i = 0; i < S390_NUM_REGS; i++)
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if (regmap_fpregset[i] != -1)
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regcache_raw_supply (regcache, i,
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(const char *)regp + regmap_fpregset[i]);
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}
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/* Fill register REGNO (if it is a general-purpose register) in
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*REGP with the value in GDB's register array. If REGNO is -1,
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do this for all registers. */
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void
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fill_fpregset (const struct regcache *regcache, fpregset_t *regp, int regno)
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{
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int i;
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for (i = 0; i < S390_NUM_REGS; i++)
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if (regmap_fpregset[i] != -1)
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if (regno == -1 || regno == i)
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regcache_raw_collect (regcache, i,
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(char *)regp + regmap_fpregset[i]);
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}
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/* Find the TID for the current inferior thread to use with ptrace. */
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static int
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s390_inferior_tid (void)
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{
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/* GNU/Linux LWP ID's are process ID's. */
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int tid = TIDGET (inferior_ptid);
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if (tid == 0)
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tid = PIDGET (inferior_ptid); /* Not a threaded program. */
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return tid;
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}
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/* Fetch all general-purpose registers from process/thread TID and
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store their values in GDB's register cache. */
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static void
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fetch_regs (struct regcache *regcache, int tid)
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{
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gregset_t regs;
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ptrace_area parea;
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parea.len = sizeof (regs);
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parea.process_addr = (addr_t) ®s;
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parea.kernel_addr = offsetof (struct user_regs_struct, psw);
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if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0)
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perror_with_name (_("Couldn't get registers"));
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supply_gregset (regcache, (const gregset_t *) ®s);
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}
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/* Store all valid general-purpose registers in GDB's register cache
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into the process/thread specified by TID. */
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static void
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store_regs (const struct regcache *regcache, int tid, int regnum)
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{
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gregset_t regs;
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ptrace_area parea;
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parea.len = sizeof (regs);
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parea.process_addr = (addr_t) ®s;
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parea.kernel_addr = offsetof (struct user_regs_struct, psw);
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if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0)
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perror_with_name (_("Couldn't get registers"));
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fill_gregset (regcache, ®s, regnum);
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if (ptrace (PTRACE_POKEUSR_AREA, tid, (long) &parea) < 0)
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perror_with_name (_("Couldn't write registers"));
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}
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/* Fetch all floating-point registers from process/thread TID and store
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their values in GDB's register cache. */
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static void
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fetch_fpregs (struct regcache *regcache, int tid)
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{
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fpregset_t fpregs;
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ptrace_area parea;
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parea.len = sizeof (fpregs);
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parea.process_addr = (addr_t) &fpregs;
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parea.kernel_addr = offsetof (struct user_regs_struct, fp_regs);
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if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0)
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perror_with_name (_("Couldn't get floating point status"));
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supply_fpregset (regcache, (const fpregset_t *) &fpregs);
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}
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/* Store all valid floating-point registers in GDB's register cache
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into the process/thread specified by TID. */
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static void
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store_fpregs (const struct regcache *regcache, int tid, int regnum)
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{
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fpregset_t fpregs;
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ptrace_area parea;
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parea.len = sizeof (fpregs);
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parea.process_addr = (addr_t) &fpregs;
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parea.kernel_addr = offsetof (struct user_regs_struct, fp_regs);
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if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0)
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perror_with_name (_("Couldn't get floating point status"));
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fill_fpregset (regcache, &fpregs, regnum);
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if (ptrace (PTRACE_POKEUSR_AREA, tid, (long) &parea) < 0)
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perror_with_name (_("Couldn't write floating point status"));
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}
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/* Fetch register REGNUM from the child process. If REGNUM is -1, do
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this for all registers. */
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static void
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s390_linux_fetch_inferior_registers (struct target_ops *ops,
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struct regcache *regcache, int regnum)
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{
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int tid = s390_inferior_tid ();
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if (regnum == -1
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|| (regnum < S390_NUM_REGS && regmap_gregset[regnum] != -1))
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fetch_regs (regcache, tid);
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if (regnum == -1
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|| (regnum < S390_NUM_REGS && regmap_fpregset[regnum] != -1))
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fetch_fpregs (regcache, tid);
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}
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/* Store register REGNUM back into the child process. If REGNUM is
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-1, do this for all registers. */
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static void
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s390_linux_store_inferior_registers (struct target_ops *ops,
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struct regcache *regcache, int regnum)
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{
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int tid = s390_inferior_tid ();
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if (regnum == -1
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|| (regnum < S390_NUM_REGS && regmap_gregset[regnum] != -1))
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store_regs (regcache, tid, regnum);
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if (regnum == -1
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|| (regnum < S390_NUM_REGS && regmap_fpregset[regnum] != -1))
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store_fpregs (regcache, tid, regnum);
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}
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/* Hardware-assisted watchpoint handling. */
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/* We maintain a list of all currently active watchpoints in order
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to properly handle watchpoint removal.
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The only thing we actually need is the total address space area
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spanned by the watchpoints. */
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struct watch_area
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{
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struct watch_area *next;
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CORE_ADDR lo_addr;
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CORE_ADDR hi_addr;
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};
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static struct watch_area *watch_base = NULL;
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static int
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s390_stopped_by_watchpoint (void)
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{
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per_lowcore_bits per_lowcore;
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ptrace_area parea;
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int result;
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/* Speed up common case. */
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if (!watch_base)
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return 0;
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parea.len = sizeof (per_lowcore);
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parea.process_addr = (addr_t) & per_lowcore;
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parea.kernel_addr = offsetof (struct user_regs_struct, per_info.lowcore);
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if (ptrace (PTRACE_PEEKUSR_AREA, s390_inferior_tid (), &parea) < 0)
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perror_with_name (_("Couldn't retrieve watchpoint status"));
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result = (per_lowcore.perc_storage_alteration == 1
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&& per_lowcore.perc_store_real_address == 0);
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if (result)
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{
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/* Do not report this watchpoint again. */
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memset (&per_lowcore, 0, sizeof (per_lowcore));
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if (ptrace (PTRACE_POKEUSR_AREA, s390_inferior_tid (), &parea) < 0)
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perror_with_name (_("Couldn't clear watchpoint status"));
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}
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return result;
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}
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static void
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s390_fix_watch_points (ptid_t ptid)
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{
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int tid;
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per_struct per_info;
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ptrace_area parea;
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CORE_ADDR watch_lo_addr = (CORE_ADDR)-1, watch_hi_addr = 0;
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struct watch_area *area;
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tid = TIDGET (ptid);
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if (tid == 0)
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tid = PIDGET (ptid);
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for (area = watch_base; area; area = area->next)
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{
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watch_lo_addr = min (watch_lo_addr, area->lo_addr);
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watch_hi_addr = max (watch_hi_addr, area->hi_addr);
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}
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parea.len = sizeof (per_info);
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parea.process_addr = (addr_t) & per_info;
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parea.kernel_addr = offsetof (struct user_regs_struct, per_info);
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if (ptrace (PTRACE_PEEKUSR_AREA, tid, &parea) < 0)
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perror_with_name (_("Couldn't retrieve watchpoint status"));
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if (watch_base)
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{
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per_info.control_regs.bits.em_storage_alteration = 1;
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per_info.control_regs.bits.storage_alt_space_ctl = 1;
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}
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else
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{
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per_info.control_regs.bits.em_storage_alteration = 0;
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per_info.control_regs.bits.storage_alt_space_ctl = 0;
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}
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per_info.starting_addr = watch_lo_addr;
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per_info.ending_addr = watch_hi_addr;
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if (ptrace (PTRACE_POKEUSR_AREA, tid, &parea) < 0)
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perror_with_name (_("Couldn't modify watchpoint status"));
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}
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static int
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s390_insert_watchpoint (CORE_ADDR addr, int len, int type)
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{
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struct lwp_info *lp;
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ptid_t ptid;
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struct watch_area *area = xmalloc (sizeof (struct watch_area));
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if (!area)
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return -1;
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area->lo_addr = addr;
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area->hi_addr = addr + len - 1;
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area->next = watch_base;
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watch_base = area;
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ALL_LWPS (lp, ptid)
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s390_fix_watch_points (ptid);
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return 0;
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}
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static int
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s390_remove_watchpoint (CORE_ADDR addr, int len, int type)
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{
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struct lwp_info *lp;
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ptid_t ptid;
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struct watch_area *area, **parea;
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for (parea = &watch_base; *parea; parea = &(*parea)->next)
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if ((*parea)->lo_addr == addr
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&& (*parea)->hi_addr == addr + len - 1)
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break;
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if (!*parea)
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{
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fprintf_unfiltered (gdb_stderr,
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"Attempt to remove nonexistent watchpoint.\n");
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return -1;
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}
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area = *parea;
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*parea = area->next;
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xfree (area);
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ALL_LWPS (lp, ptid)
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s390_fix_watch_points (ptid);
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return 0;
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}
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static int
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s390_can_use_hw_breakpoint (int type, int cnt, int othertype)
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{
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return type == bp_hardware_watchpoint;
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}
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static int
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s390_region_ok_for_hw_watchpoint (CORE_ADDR addr, int cnt)
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{
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return 1;
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}
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static int
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s390_target_wordsize (void)
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{
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int wordsize = 4;
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/* Check for 64-bit inferior process. This is the case when the host is
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64-bit, and in addition bit 32 of the PSW mask is set. */
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#ifdef __s390x__
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long pswm;
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errno = 0;
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pswm = (long) ptrace (PTRACE_PEEKUSER, s390_inferior_tid (), PT_PSWMASK, 0);
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if (errno == 0 && (pswm & 0x100000000ul) != 0)
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wordsize = 8;
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#endif
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return wordsize;
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}
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static int
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s390_auxv_parse (struct target_ops *ops, gdb_byte **readptr,
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gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp)
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{
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int sizeof_auxv_field = s390_target_wordsize ();
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enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch);
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gdb_byte *ptr = *readptr;
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if (endptr == ptr)
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return 0;
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if (endptr - ptr < sizeof_auxv_field * 2)
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return -1;
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*typep = extract_unsigned_integer (ptr, sizeof_auxv_field, byte_order);
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ptr += sizeof_auxv_field;
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*valp = extract_unsigned_integer (ptr, sizeof_auxv_field, byte_order);
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ptr += sizeof_auxv_field;
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*readptr = ptr;
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return 1;
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}
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#ifdef __s390x__
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static unsigned long
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s390_get_hwcap (void)
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{
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CORE_ADDR field;
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if (target_auxv_search (¤t_target, AT_HWCAP, &field))
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return (unsigned long) field;
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return 0;
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}
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#endif
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static const struct target_desc *
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s390_read_description (struct target_ops *ops)
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{
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#ifdef __s390x__
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/* If GDB itself is compiled as 64-bit, we are running on a machine in
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z/Architecture mode. If the target is running in 64-bit addressing
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mode, report s390x architecture. If the target is running in 31-bit
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addressing mode, but the kernel supports using 64-bit registers in
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that mode, report s390 architecture with 64-bit GPRs. */
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if (s390_target_wordsize () == 8)
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return tdesc_s390x_linux64;
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if (s390_get_hwcap () & HWCAP_S390_HIGH_GPRS)
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return tdesc_s390_linux64;
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#endif
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/* If GDB itself is compiled as 31-bit, or if we're running a 31-bit inferior
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on a 64-bit kernel that does not support using 64-bit registers in 31-bit
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mode, report s390 architecture with 32-bit GPRs. */
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return tdesc_s390_linux32;
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}
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void _initialize_s390_nat (void);
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void
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_initialize_s390_nat (void)
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{
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struct target_ops *t;
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/* Fill in the generic GNU/Linux methods. */
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t = linux_target ();
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/* Add our register access methods. */
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t->to_fetch_registers = s390_linux_fetch_inferior_registers;
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t->to_store_registers = s390_linux_store_inferior_registers;
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/* Add our watchpoint methods. */
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t->to_can_use_hw_breakpoint = s390_can_use_hw_breakpoint;
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t->to_region_ok_for_hw_watchpoint = s390_region_ok_for_hw_watchpoint;
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t->to_have_continuable_watchpoint = 1;
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t->to_stopped_by_watchpoint = s390_stopped_by_watchpoint;
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t->to_insert_watchpoint = s390_insert_watchpoint;
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t->to_remove_watchpoint = s390_remove_watchpoint;
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/* Detect target architecture. */
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t->to_read_description = s390_read_description;
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t->to_auxv_parse = s390_auxv_parse;
|
|
|
|
/* Register the target. */
|
|
linux_nat_add_target (t);
|
|
linux_nat_set_new_thread (t, s390_fix_watch_points);
|
|
}
|