+/* Native-dependent code for DragonFly/i386.
+
+ Copyright (C) 2001-2013 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 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ 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, see <http://www.gnu.org/licenses/>. */
+
+#include "defs.h"
+#include "inferior.h"
+#include "regcache.h"
+#include "target.h"
+#include "gregset.h"
+
+#include <sys/types.h>
+#include <sys/procfs.h>
+#include <sys/ptrace.h>
+#include <sys/sysctl.h>
+
+#include "fbsd-nat.h"
+#include "i386-tdep.h"
+#include "i386-nat.h"
+#include "i386bsd-nat.h"
+
+#ifdef DFLY_PCB_SUPPLY
+/* Resume execution of the inferior process. If STEP is nonzero,
+ single-step it. If SIGNAL is nonzero, give it that signal. */
+
+static void
+i386dfly_resume (struct target_ops *ops,
+ ptid_t ptid, int step, enum gdb_signal signal)
+{
+ pid_t pid = ptid_get_pid (ptid);
+ int request = PT_STEP;
+
+ if (pid == -1)
+ /* Resume all threads. This only gets used in the non-threaded
+ case, where "resume all threads" and "resume inferior_ptid" are
+ the same. */
+ pid = ptid_get_pid (inferior_ptid);
+
+ if (!step)
+ {
+ struct regcache *regcache = get_current_regcache ();
+ ULONGEST eflags;
+
+ /* Workaround for a bug in FreeBSD. Make sure that the trace
+ flag is off when doing a continue. There is a code path
+ through the kernel which leaves the flag set when it should
+ have been cleared. If a process has a signal pending (such
+ as SIGALRM) and we do a PT_STEP, the process never really has
+ a chance to run because the kernel needs to notify the
+ debugger that a signal is being sent. Therefore, the process
+ never goes through the kernel's trap() function which would
+ normally clear it. */
+
+ regcache_cooked_read_unsigned (regcache, I386_EFLAGS_REGNUM,
+ &eflags);
+ if (eflags & 0x0100)
+ regcache_cooked_write_unsigned (regcache, I386_EFLAGS_REGNUM,
+ eflags & ~0x0100);
+
+ request = PT_CONTINUE;
+ }
+
+ /* An addres of (caddr_t) 1 tells ptrace to continue from where it
+ was. (If GDB wanted it to start some other way, we have already
+ written a new PC value to the child.) */
+ if (ptrace (request, pid, (caddr_t) 1,
+ gdb_signal_to_host (signal)) == -1)
+ perror_with_name (("ptrace"));
+}
+\f
+
+/* Transfering the registers between GDB, inferiors and core files. */
+
+/* Fill GDB's register array with the general-purpose register values
+ in *GREGSETP. */
+
+void
+supply_gregset (struct regcache *regcache, const gregset_t *gregsetp)
+{
+ i386bsd_supply_gregset (regcache, gregsetp);
+}
+
+/* Fill register REGNUM (if it is a general-purpose register) in
+ *GREGSETPS with the value in GDB's register array. If REGNUM is -1,
+ do this for all registers. */
+
+void
+fill_gregset (const struct regcache *regcache, gdb_gregset_t *gregsetp, int regnum)
+{
+ i386bsd_collect_gregset (regcache, gregsetp, regnum);
+}
+
+#include "i387-tdep.h"
+
+/* Fill GDB's register array with the floating-point register values
+ in *FPREGSETP. */
+
+void
+supply_fpregset (struct regcache *regcache, const fpregset_t *fpregsetp)
+{
+ i387_supply_fsave (regcache, -1, fpregsetp);
+}
+
+/* Fill register REGNUM (if it is a floating-point register) in
+ *FPREGSETP with the value in GDB's register array. If REGNUM is -1,
+ do this for all registers. */
+
+void
+fill_fpregset (const struct regcache *regcache, gdb_fpregset_t *fpregsetp, int regnum)
+{
+ i387_collect_fsave (regcache, regnum, fpregsetp);
+}
+\f
+
+/* Support for debugging kernel virtual memory images. */
+
+#include <sys/types.h>
+#include <machine/pcb.h>
+
+#include "bsd-kvm.h"
+
+static int
+i386dfly_supply_pcb (struct regcache *regcache, struct pcb *pcb)
+{
+ /* The following is true for FreeBSD 4.7:
+
+ The pcb contains %eip, %ebx, %esp, %ebp, %esi, %edi and %gs.
+ This accounts for all callee-saved registers specified by the
+ psABI and then some. Here %esp contains the stack pointer at the
+ point just after the call to cpu_switch(). From this information
+ we reconstruct the register state as it would look when we just
+ returned from cpu_switch(). */
+
+ /* The stack pointer shouldn't be zero. */
+ if (pcb->pcb_esp == 0)
+ return 0;
+
+ pcb->pcb_esp += 4;
+ regcache_raw_supply (regcache, I386_EDI_REGNUM, &pcb->pcb_edi);
+ regcache_raw_supply (regcache, I386_ESI_REGNUM, &pcb->pcb_esi);
+ regcache_raw_supply (regcache, I386_EBP_REGNUM, &pcb->pcb_ebp);
+ regcache_raw_supply (regcache, I386_ESP_REGNUM, &pcb->pcb_esp);
+ regcache_raw_supply (regcache, I386_EBX_REGNUM, &pcb->pcb_ebx);
+ regcache_raw_supply (regcache, I386_EIP_REGNUM, &pcb->pcb_eip);
+ regcache_raw_supply (regcache, I386_GS_REGNUM, &pcb->pcb_gs);
+
+ return 1;
+}
+#endif /* DFLY_PCB_SUPPLY */
+\f
+
+/* Prevent warning from -Wmissing-prototypes. */
+void _initialize_i386dfly_nat (void);
+
+void
+_initialize_i386dfly_nat (void)
+{
+ struct target_ops *t;
+
+ /* Add some extra features to the common *BSD/i386 target. */
+ t = i386bsd_target ();
+
+#ifdef HAVE_PT_GETDBREGS
+
+ i386_use_watchpoints (t);
+
+ i386_dr_low.set_control = i386bsd_dr_set_control;
+ i386_dr_low.set_addr = i386bsd_dr_set_addr;
+ i386_dr_low.get_addr = i386bsd_dr_get_addr;
+ i386_dr_low.get_status = i386bsd_dr_get_status;
+ i386_dr_low.get_control = i386bsd_dr_get_control;
+ i386_set_debug_register_length (4);
+
+#endif /* HAVE_PT_GETDBREGS */
+
+
+ t->to_pid_to_exec_file = fbsd_pid_to_exec_file;
+ t->to_find_memory_regions = fbsd_find_memory_regions;
+ t->to_make_corefile_notes = fbsd_make_corefile_notes;
+ add_target (t);
+
+#ifdef DFLY_PCB_SUPPLY
+ /* Support debugging kernel virtual memory images. */
+ bsd_kvm_add_target (i386dfly_supply_pcb);
+#endif
+
+ /* DragonFly provides a kern.ps_strings sysctl that we can use to
+ locate the sigtramp. That way we can still recognize a sigtramp
+ if its location is changed in a new kernel. Of course this is
+ still based on the assumption that the sigtramp is placed
+ directly under the location where the program arguments and
+ environment can be found. */
+#ifdef KERN_PS_STRINGS
+ {
+ int mib[2];
+ u_long ps_strings;
+ size_t len;
+
+ mib[0] = CTL_KERN;
+ mib[1] = KERN_PS_STRINGS;
+ len = sizeof (ps_strings);
+ if (sysctl (mib, 2, &ps_strings, &len, NULL, 0) == 0)
+ {
+ i386dfly_sigtramp_start_addr = ps_strings - 128;
+ i386dfly_sigtramp_end_addr = ps_strings;
+ }
+ }
+#endif
+}