/* Native-dependent code for modern i386 BSD's.
- Copyright (C) 2000 Free Software Foundation, Inc.
+
+ Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010
+ Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "inferior.h"
+#include "regcache.h"
+#include "gdb_assert.h"
+#include <signal.h>
+#include <stddef.h>
#include <sys/types.h>
#include <sys/ptrace.h>
#include <machine/reg.h>
#include <machine/frame.h>
-#ifdef HAVE_SYS_PROCFS_H
-#include <sys/procfs.h>
-#endif
-
-#ifndef HAVE_GREGSET_T
-typedef struct reg gregset_t;
-#endif
-
-#ifndef HAVE_FPREGSET_T
-typedef struct fpreg fpregset_t;
-#endif
-
-#include "gregset.h"
+#include "i386-tdep.h"
+#include "i387-tdep.h"
+#include "i386bsd-nat.h"
+#include "inf-ptrace.h"
\f
/* In older BSD versions we cannot get at some of the segment
registers until the 3.0 release. We have autoconf checks for their
presence, and deal gracefully with their absence. */
-/* Registers we shouldn't try to fetch. */
-#if !defined (CANNOT_FETCH_REGISTER)
-#define CANNOT_FETCH_REGISTER(regno) cannot_fetch_register (regno)
-#endif
-
-/* Registers we shouldn't try to store. */
-#if !defined (CANNOT_STORE_REGISTER)
-#define CANNOT_STORE_REGISTER(regno) cannot_fetch_register (regno)
-#endif
-
-/* Offset to the gregset_t location where REG is stored. */
-#define REG_OFFSET(reg) offsetof (gregset_t, reg)
+/* Offset in `struct reg' where MEMBER is stored. */
+#define REG_OFFSET(member) offsetof (struct reg, member)
-/* At reg_offset[REGNO] you'll find the offset to the gregset_t
- location where the GDB register REGNO is stored. Unsupported
+/* At i386bsd_reg_offset[REGNUM] you'll find the offset in `struct
+ reg' where the GDB register REGNUM is stored. Unsupported
registers are marked with `-1'. */
-static int reg_offset[] =
+static int i386bsd_r_reg_offset[] =
{
REG_OFFSET (r_eax),
REG_OFFSET (r_ecx),
REG_OFFSET (r_edx),
- REG_OFFSET (r_edx),
+ REG_OFFSET (r_ebx),
REG_OFFSET (r_esp),
REG_OFFSET (r_ebp),
REG_OFFSET (r_esi),
#endif
};
-#define REG_ADDR(regset, regno) ((char *) (regset) + reg_offset[regno])
+/* Macro to determine if a register is fetched with PT_GETREGS. */
+#define GETREGS_SUPPLIES(regnum) \
+ ((0 <= (regnum) && (regnum) <= 15))
-/* Return nonzero if we shouldn't try to fetch register REGNO. */
+#ifdef HAVE_PT_GETXMMREGS
+/* Set to 1 if the kernel supports PT_GETXMMREGS. Initialized to -1
+ so that we try PT_GETXMMREGS the first time around. */
+static int have_ptrace_xmmregs = -1;
+#endif
+\f
+
+/* Supply the general-purpose registers in GREGS, to REGCACHE. */
-static int
-cannot_fetch_register (int regno)
+static void
+i386bsd_supply_gregset (struct regcache *regcache, const void *gregs)
{
- return (reg_offset[regno] == -1);
-}
-\f
+ const char *regs = gregs;
+ int regnum;
+
+ for (regnum = 0; regnum < ARRAY_SIZE (i386bsd_r_reg_offset); regnum++)
+ {
+ int offset = i386bsd_r_reg_offset[regnum];
-/* Transfering the registers between GDB, inferiors and core files. */
+ if (offset != -1)
+ regcache_raw_supply (regcache, regnum, regs + offset);
+ }
+}
-/* Fill GDB's register array with the genereal-purpose register values
- in *GREGSETP. */
+/* Collect register REGNUM from REGCACHE and store its contents in
+ GREGS. If REGNUM is -1, collect and store all appropriate
+ registers. */
-void
-supply_gregset (gregset_t *gregsetp)
+static void
+i386bsd_collect_gregset (const struct regcache *regcache,
+ void *gregs, int regnum)
{
+ char *regs = gregs;
int i;
- for (i = 0; i < NUM_GREGS; i++)
+ for (i = 0; i < ARRAY_SIZE (i386bsd_r_reg_offset); i++)
{
- if (CANNOT_FETCH_REGISTER (i))
- supply_register (i, NULL);
- else
- supply_register (i, REG_ADDR (gregsetp, i));
+ if (regnum == -1 || regnum == i)
+ {
+ int offset = i386bsd_r_reg_offset[i];
+
+ if (offset != -1)
+ regcache_raw_collect (regcache, i, regs + offset);
+ }
}
}
-/* Fill register REGNO (if it is a general-purpose register) in
- *GREGSETPS with the value in GDB's register array. If REGNO is -1,
- do this for all registers. */
+/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
+ for all registers (including the floating point registers). */
-void
-fill_gregset (gregset_t *gregsetp, int regno)
+static void
+i386bsd_fetch_inferior_registers (struct target_ops *ops,
+ struct regcache *regcache, int regnum)
{
- int i;
+ if (regnum == -1 || GETREGS_SUPPLIES (regnum))
+ {
+ struct reg regs;
+
+ if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
+ (PTRACE_TYPE_ARG3) ®s, 0) == -1)
+ perror_with_name (_("Couldn't get registers"));
+
+ i386bsd_supply_gregset (regcache, ®s);
+ if (regnum != -1)
+ return;
+ }
+
+ if (regnum == -1 || regnum >= I386_ST0_REGNUM)
+ {
+ struct fpreg fpregs;
+#ifdef HAVE_PT_GETXMMREGS
+ char xmmregs[512];
+
+ if (have_ptrace_xmmregs != 0
+ && ptrace(PT_GETXMMREGS, PIDGET (inferior_ptid),
+ (PTRACE_TYPE_ARG3) xmmregs, 0) == 0)
+ {
+ have_ptrace_xmmregs = 1;
+ i387_supply_fxsave (regcache, -1, xmmregs);
+ }
+ else
+ {
+ if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
+ (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
+ perror_with_name (_("Couldn't get floating point status"));
+
+ i387_supply_fsave (regcache, -1, &fpregs);
+ }
+#else
+ if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
+ (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
+ perror_with_name (_("Couldn't get floating point status"));
- for (i = 0; i < NUM_GREGS; i++)
- if ((regno == -1 || regno == i) && ! CANNOT_STORE_REGISTER (i))
- memcpy (REG_ADDR (gregsetp, i), ®isters[REGISTER_BYTE (i)],
- REGISTER_RAW_SIZE (i));
+ i387_supply_fsave (regcache, -1, &fpregs);
+#endif
+ }
}
-#include "i387-nat.h"
+/* Store register REGNUM back into the inferior. If REGNUM is -1, do
+ this for all registers (including the floating point registers). */
-/* Fill GDB's register array with the floating-point register values
- in *FPREGSETP. */
+static void
+i386bsd_store_inferior_registers (struct target_ops *ops,
+ struct regcache *regcache, int regnum)
+{
+ if (regnum == -1 || GETREGS_SUPPLIES (regnum))
+ {
+ struct reg regs;
-void
-supply_fpregset (fpregset_t *fpregsetp)
+ if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
+ (PTRACE_TYPE_ARG3) ®s, 0) == -1)
+ perror_with_name (_("Couldn't get registers"));
+
+ i386bsd_collect_gregset (regcache, ®s, regnum);
+
+ if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
+ (PTRACE_TYPE_ARG3) ®s, 0) == -1)
+ perror_with_name (_("Couldn't write registers"));
+
+ if (regnum != -1)
+ return;
+ }
+
+ if (regnum == -1 || regnum >= I386_ST0_REGNUM)
+ {
+ struct fpreg fpregs;
+#ifdef HAVE_PT_GETXMMREGS
+ char xmmregs[512];
+
+ if (have_ptrace_xmmregs != 0
+ && ptrace(PT_GETXMMREGS, PIDGET (inferior_ptid),
+ (PTRACE_TYPE_ARG3) xmmregs, 0) == 0)
+ {
+ have_ptrace_xmmregs = 1;
+
+ i387_collect_fxsave (regcache, regnum, xmmregs);
+
+ if (ptrace (PT_SETXMMREGS, PIDGET (inferior_ptid),
+ (PTRACE_TYPE_ARG3) xmmregs, 0) == -1)
+ perror_with_name (_("Couldn't write XMM registers"));
+ }
+ else
+ {
+ have_ptrace_xmmregs = 0;
+#endif
+ if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
+ (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
+ perror_with_name (_("Couldn't get floating point status"));
+
+ i387_collect_fsave (regcache, regnum, &fpregs);
+
+ if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
+ (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
+ perror_with_name (_("Couldn't write floating point status"));
+#ifdef HAVE_PT_GETXMMREGS
+ }
+#endif
+ }
+}
+
+/* Create a prototype *BSD/i386 target. The client can override it
+ with local methods. */
+
+struct target_ops *
+i386bsd_target (void)
{
- i387_supply_fsave ((char *) fpregsetp);
+ struct target_ops *t;
+
+ t = inf_ptrace_target ();
+ t->to_fetch_registers = i386bsd_fetch_inferior_registers;
+ t->to_store_registers = i386bsd_store_inferior_registers;
+ return t;
}
+\f
-/* Fill register REGNO (if it is a floating-point register) in
- *FPREGSETP with the value in GDB's register array. If REGNO is -1,
- do this for all registers. */
+/* Support for debug registers. */
-void
-fill_fpregset (fpregset_t *fpregsetp, int regno)
+#ifdef HAVE_PT_GETDBREGS
+
+/* Not all versions of FreeBSD/i386 that support the debug registers
+ have this macro. */
+#ifndef DBREG_DRX
+#define DBREG_DRX(d, x) ((&d->dr0)[x])
+#endif
+
+static void
+i386bsd_dr_set (int regnum, unsigned int value)
{
- i387_fill_fsave ((char *) fpregsetp, regno);
+ struct dbreg dbregs;
+
+ if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid),
+ (PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
+ perror_with_name (_("Couldn't get debug registers"));
+
+ /* For some mysterious reason, some of the reserved bits in the
+ debug control register get set. Mask these off, otherwise the
+ ptrace call below will fail. */
+ DBREG_DRX ((&dbregs), 7) &= ~(0x0000fc00);
+
+ DBREG_DRX ((&dbregs), regnum) = value;
+
+ if (ptrace (PT_SETDBREGS, PIDGET (inferior_ptid),
+ (PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
+ perror_with_name (_("Couldn't write debug registers"));
}
-/* Fetch register REGNO from the inferior. If REGNO is -1, do this
- for all registers (including the floating point registers). */
+void
+i386bsd_dr_set_control (unsigned long control)
+{
+ i386bsd_dr_set (7, control);
+}
void
-fetch_inferior_registers (int regno)
+i386bsd_dr_set_addr (int regnum, CORE_ADDR addr)
{
- gregset_t gregs;
+ gdb_assert (regnum >= 0 && regnum <= 4);
- if (ptrace (PT_GETREGS, inferior_pid, (PTRACE_ARG3_TYPE) &gregs, 0) == -1)
- perror_with_name ("Couldn't get registers");
+ i386bsd_dr_set (regnum, addr);
+}
- supply_gregset (&gregs);
+void
+i386bsd_dr_reset_addr (int regnum)
+{
+ gdb_assert (regnum >= 0 && regnum <= 4);
- if (regno == -1 || regno >= FP0_REGNUM)
- {
- fpregset_t fpregs;
+ i386bsd_dr_set (regnum, 0);
+}
- if (ptrace (PT_GETFPREGS, inferior_pid,
- (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
- perror_with_name ("Couldn't get floating point status");
+unsigned long
+i386bsd_dr_get_status (void)
+{
+ struct dbreg dbregs;
+
+ /* FIXME: kettenis/2001-03-31: Calling perror_with_name if the
+ ptrace call fails breaks debugging remote targets. The correct
+ way to fix this is to add the hardware breakpoint and watchpoint
+ stuff to the target vector. For now, just return zero if the
+ ptrace call fails. */
+ if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid),
+ (PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
+#if 0
+ perror_with_name (_("Couldn't read debug registers"));
+#else
+ return 0;
+#endif
- supply_fpregset (&fpregs);
- }
+ return DBREG_DRX ((&dbregs), 6);
}
-/* Store register REGNO back into the inferior. If REGNO is -1, do
- this for all registers (including the floating point registers). */
+#endif /* PT_GETDBREGS */
+\f
void
-store_inferior_registers (int regno)
+_initialize_i386bsd_nat (void)
{
- gregset_t gregs;
+ int offset;
+
+ /* To support the recognition of signal handlers, i386bsd-tdep.c
+ hardcodes some constants. Inclusion of this file means that we
+ are compiling a native debugger, which means that we can use the
+ system header files and sysctl(3) to get at the relevant
+ information. */
+
+#if defined (__FreeBSD_version) && __FreeBSD_version >= 400011
+#define SC_REG_OFFSET i386fbsd4_sc_reg_offset
+#elif defined (__FreeBSD_version) && __FreeBSD_version >= 300005
+#define SC_REG_OFFSET i386fbsd_sc_reg_offset
+#elif defined (NetBSD) || defined (__NetBSD_Version__)
+#define SC_REG_OFFSET i386nbsd_sc_reg_offset
+#elif defined (OpenBSD)
+#define SC_REG_OFFSET i386obsd_sc_reg_offset
+#endif
+
+#ifdef SC_REG_OFFSET
- if (ptrace (PT_GETREGS, inferior_pid, (PTRACE_ARG3_TYPE) &gregs, 0) == -1)
- perror_with_name ("Couldn't get registers");
+ /* We only check the program counter, stack pointer and frame
+ pointer since these members of `struct sigcontext' are essential
+ for providing backtraces. More checks could be added, but would
+ involve adding configure checks for the appropriate structure
+ members, since older BSD's don't provide all of them. */
- fill_gregset (&gregs, regno);
+#define SC_PC_OFFSET SC_REG_OFFSET[I386_EIP_REGNUM]
+#define SC_SP_OFFSET SC_REG_OFFSET[I386_ESP_REGNUM]
+#define SC_FP_OFFSET SC_REG_OFFSET[I386_EBP_REGNUM]
- if (ptrace (PT_SETREGS, inferior_pid, (PTRACE_ARG3_TYPE) &gregs, 0) == -1)
- perror_with_name ("Couldn't write registers");
+ /* Override the default value for the offset of the program counter
+ in the sigcontext structure. */
+ offset = offsetof (struct sigcontext, sc_pc);
- if (regno == -1 || regno >= FP0_REGNUM)
+ if (SC_PC_OFFSET != offset)
{
- fpregset_t fpregs;
+ warning (_("\
+offsetof (struct sigcontext, sc_pc) yields %d instead of %d.\n\
+Please report this to <bug-gdb@gnu.org>."),
+ offset, SC_PC_OFFSET);
+ }
+
+ SC_PC_OFFSET = offset;
- if (ptrace (PT_GETFPREGS, inferior_pid,
- (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
- perror_with_name ("Couldn't get floating point status");
+ /* Likewise for the stack pointer. */
+ offset = offsetof (struct sigcontext, sc_sp);
- fill_fpregset (&fpregs, regno);
-
- if (ptrace (PT_SETFPREGS, inferior_pid,
- (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
- perror_with_name ("Couldn't write floating point status");
+ if (SC_SP_OFFSET != offset)
+ {
+ warning (_("\
+offsetof (struct sigcontext, sc_sp) yields %d instead of %d.\n\
+Please report this to <bug-gdb@gnu.org>."),
+ offset, SC_SP_OFFSET);
}
-}
-\f
-/* Support for the user struct. */
+ SC_SP_OFFSET = offset;
-/* Return the address register REGNO. BLOCKEND is the value of
- u.u_ar0, which should point to the registers. */
+ /* And the frame pointer. */
+ offset = offsetof (struct sigcontext, sc_fp);
-CORE_ADDR
-register_u_addr (CORE_ADDR blockend, int regno)
-{
- return (CORE_ADDR) REG_ADDR (blockend, regno);
-}
-
-#include <sys/param.h>
-#include <sys/user.h>
+ if (SC_FP_OFFSET != offset)
+ {
+ warning (_("\
+offsetof (struct sigcontext, sc_fp) yields %d instead of %d.\n\
+Please report this to <bug-gdb@gnu.org>."),
+ offset, SC_FP_OFFSET);
+ }
-/* Return the size of the user struct. */
+ SC_FP_OFFSET = offset;
-int
-kernel_u_size (void)
-{
- return (sizeof (struct user));
+#endif /* SC_REG_OFFSET */
}
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