/* Native-dependent code for modern i386 BSD's.
- Copyright 2000, 2001 Free Software Foundation, Inc.
+
+ Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005
+ Free Software Foundation, Inc.
This file is part of GDB.
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. */
+ Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA. */
#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 general-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 (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 (current_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 (current_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 (current_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 (current_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 (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 (current_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 (current_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 (current_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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