/* Native-dependent code for FreeBSD/amd64.
- Copyright 2003 Free Software Foundation, Inc.
+
+ Copyright (C) 2003-2015 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 "target.h"
-#include "gdb_assert.h"
#include <signal.h>
-#include <stddef.h>
#include <sys/types.h>
#include <sys/ptrace.h>
#include <sys/sysctl.h>
+#include <sys/user.h>
#include <machine/reg.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 "x86-64-tdep.h"
+#include "fbsd-nat.h"
+#include "amd64-tdep.h"
+#include "amd64-nat.h"
+#include "amd64bsd-nat.h"
+#include "x86-nat.h"
\f
-/* 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
- registers are marked with `-1'. */
-static int reg_offset[] =
+/* At amd64fbsd64_r_reg_offset[REGNUM] you'll find the offset in
+ `struct reg' location where the GDB register REGNUM is stored.
+ Unsupported registers are marked with `-1'. */
+static int amd64fbsd64_r_reg_offset[] =
{
REG_OFFSET (r_rax),
REG_OFFSET (r_rbx),
REG_OFFSET (r_r15),
REG_OFFSET (r_rip),
REG_OFFSET (r_rflags),
+ REG_OFFSET (r_cs),
+ REG_OFFSET (r_ss),
-1,
-1,
-1,
-1
};
-
-#define REG_ADDR(regset, regno) ((char *) (regset) + reg_offset[regno])
-
-/* Macro to determine if a register is fetched with PT_GETREGS. */
-#define GETREGS_SUPPLIES(regno) \
- ((0 <= (regno) && (regno) < X86_64_NUM_GREGS))
\f
-/* Transfering the registers between GDB, inferiors and core files. */
+/* Mapping between the general-purpose registers in FreeBSD/amd64
+ `struct reg' format and GDB's register cache layout for
+ FreeBSD/i386.
-/* Fill GDB's register array with the general-purpose register values
- in *GREGSETP. */
+ Note that most FreeBSD/amd64 registers are 64-bit, while the
+ FreeBSD/i386 registers are all 32-bit, but since we're
+ little-endian we get away with that. */
-void
-supply_gregset (gregset_t *gregsetp)
+/* From <machine/reg.h>. */
+static int amd64fbsd32_r_reg_offset[I386_NUM_GREGS] =
{
- int i;
-
- for (i = 0; i < X86_64_NUM_GREGS; i++)
- {
- if (reg_offset[i] == -1)
- supply_register (i, NULL);
- else
- supply_register (i, REG_ADDR (gregsetp, i));
- }
-}
+ 14 * 8, 13 * 8, /* %eax, %ecx */
+ 12 * 8, 11 * 8, /* %edx, %ebx */
+ 20 * 8, 10 * 8, /* %esp, %ebp */
+ 9 * 8, 8 * 8, /* %esi, %edi */
+ 17 * 8, 19 * 8, /* %eip, %eflags */
+ 18 * 8, 21 * 8, /* %cs, %ss */
+ -1, -1, -1, -1 /* %ds, %es, %fs, %gs */
+};
+\f
-/* 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. */
+/* Support for debugging kernel virtual memory images. */
-void
-fill_gregset (gregset_t *gregsetp, int regno)
-{
- int i;
+#include <machine/pcb.h>
+#include <osreldate.h>
- for (i = 0; i < X86_64_NUM_GREGS; i++)
- if ((regno == -1 || regno == i) && reg_offset[i] != -1)
- regcache_collect (i, REG_ADDR (gregsetp, i));
-}
+#include "bsd-kvm.h"
-/* Fill GDB's register array with the floating-point register values
- in *FPREGSETP. */
-
-void
-supply_fpregset (fpregset_t *fpregsetp)
+static int
+amd64fbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
{
- x86_64_supply_fxsave ((const char *) fpregsetp, -1);
+ /* The following is true for FreeBSD 5.2:
+
+ The pcb contains %rip, %rbx, %rsp, %rbp, %r12, %r13, %r14, %r15,
+ %ds, %es, %fs 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 like when we just returned from cpu_switch(). */
+
+ /* The stack pointer shouldn't be zero. */
+ if (pcb->pcb_rsp == 0)
+ return 0;
+
+ pcb->pcb_rsp += 8;
+ regcache_raw_supply (regcache, AMD64_RIP_REGNUM, &pcb->pcb_rip);
+ regcache_raw_supply (regcache, AMD64_RBX_REGNUM, &pcb->pcb_rbx);
+ regcache_raw_supply (regcache, AMD64_RSP_REGNUM, &pcb->pcb_rsp);
+ regcache_raw_supply (regcache, AMD64_RBP_REGNUM, &pcb->pcb_rbp);
+ regcache_raw_supply (regcache, 12, &pcb->pcb_r12);
+ regcache_raw_supply (regcache, 13, &pcb->pcb_r13);
+ regcache_raw_supply (regcache, 14, &pcb->pcb_r14);
+ regcache_raw_supply (regcache, 15, &pcb->pcb_r15);
+#if (__FreeBSD_version < 800075) && (__FreeBSD_kernel_version < 800075)
+ /* struct pcb provides the pcb_ds/pcb_es/pcb_fs/pcb_gs fields only
+ up until __FreeBSD_version 800074: The removal of these fields
+ occurred on 2009-04-01 while the __FreeBSD_version number was
+ bumped to 800075 on 2009-04-06. So 800075 is the closest version
+ number where we should not try to access these fields. */
+ regcache_raw_supply (regcache, AMD64_DS_REGNUM, &pcb->pcb_ds);
+ regcache_raw_supply (regcache, AMD64_ES_REGNUM, &pcb->pcb_es);
+ regcache_raw_supply (regcache, AMD64_FS_REGNUM, &pcb->pcb_fs);
+ regcache_raw_supply (regcache, AMD64_GS_REGNUM, &pcb->pcb_gs);
+#endif
+
+ return 1;
}
+\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. */
+static void (*super_mourn_inferior) (struct target_ops *ops);
-void
-fill_fpregset (fpregset_t *fpregsetp, int regno)
+static void
+amd64fbsd_mourn_inferior (struct target_ops *ops)
{
- x86_64_fill_fxsave ((char *) fpregsetp, regno);
+#ifdef HAVE_PT_GETDBREGS
+ x86_cleanup_dregs ();
+#endif
+ super_mourn_inferior (ops);
}
-/* Fetch register REGNO from the inferior. If REGNO is -1, do this
- for all registers (including the floating point registers). */
+/* Implement the to_read_description method. */
-void
-fetch_inferior_registers (int regno)
+static const struct target_desc *
+amd64fbsd_read_description (struct target_ops *ops)
{
- if (regno == -1 || GETREGS_SUPPLIES (regno))
+#ifdef PT_GETXSTATE_INFO
+ static int xsave_probed;
+ static uint64_t xcr0;
+#endif
+ struct reg regs;
+ int is64;
+
+ if (ptrace (PT_GETREGS, ptid_get_pid (inferior_ptid),
+ (PTRACE_TYPE_ARG3) ®s, 0) == -1)
+ perror_with_name (_("Couldn't get registers"));
+ is64 = (regs.r_cs == GSEL (GUCODE_SEL, SEL_UPL));
+#ifdef PT_GETXSTATE_INFO
+ if (!xsave_probed)
{
- gregset_t gregs;
-
- if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
- (PTRACE_ARG3_TYPE) &gregs, 0) == -1)
- perror_with_name ("Couldn't get registers");
-
- supply_gregset (&gregs);
- if (regno != -1)
- return;
+ struct ptrace_xstate_info info;
+
+ if (ptrace (PT_GETXSTATE_INFO, ptid_get_pid (inferior_ptid),
+ (PTRACE_TYPE_ARG3) &info, sizeof (info)) == 0)
+ {
+ amd64bsd_xsave_len = info.xsave_len;
+ xcr0 = info.xsave_mask;
+ }
+ xsave_probed = 1;
}
- if (regno == -1 || regno >= FP0_REGNUM)
+ if (amd64bsd_xsave_len != 0)
{
- fpregset_t fpregs;
-
- if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
- (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
- perror_with_name ("Couldn't get floating point status");
-
- supply_fpregset (&fpregs);
+ if (is64)
+ return amd64_target_description (xcr0);
+ else
+ return i386_target_description (xcr0);
}
+#endif
+ if (is64)
+ return tdesc_amd64;
+ else
+ return tdesc_i386;
}
-/* Store register REGNO back into the inferior. If REGNO is -1, do
- this for all registers (including the floating point registers). */
+/* Provide a prototype to silence -Wmissing-prototypes. */
+void _initialize_amd64fbsd_nat (void);
void
-store_inferior_registers (int regno)
+_initialize_amd64fbsd_nat (void)
{
- if (regno == -1 || GETREGS_SUPPLIES (regno))
- {
- gregset_t gregs;
-
- if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
- (PTRACE_ARG3_TYPE) &gregs, 0) == -1)
- perror_with_name ("Couldn't get registers");
+ struct target_ops *t;
+ int offset;
- fill_gregset (&gregs, regno);
+ amd64_native_gregset32_reg_offset = amd64fbsd32_r_reg_offset;
+ amd64_native_gregset64_reg_offset = amd64fbsd64_r_reg_offset;
- if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
- (PTRACE_ARG3_TYPE) &gregs, 0) == -1)
- perror_with_name ("Couldn't write registers");
+ /* Add some extra features to the common *BSD/i386 target. */
+ t = amd64bsd_target ();
- if (regno != -1)
- return;
- }
+#ifdef HAVE_PT_GETDBREGS
- if (regno == -1 || regno >= FP0_REGNUM)
- {
- fpregset_t fpregs;
+ x86_use_watchpoints (t);
- if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
- (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
- perror_with_name ("Couldn't get floating point status");
+ x86_dr_low.set_control = amd64bsd_dr_set_control;
+ x86_dr_low.set_addr = amd64bsd_dr_set_addr;
+ x86_dr_low.get_addr = amd64bsd_dr_get_addr;
+ x86_dr_low.get_status = amd64bsd_dr_get_status;
+ x86_dr_low.get_control = amd64bsd_dr_get_control;
+ x86_set_debug_register_length (8);
- fill_fpregset (&fpregs, regno);
+#endif /* HAVE_PT_GETDBREGS */
- if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
- (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
- perror_with_name ("Couldn't write floating point status");
- }
-}
-\f
+ super_mourn_inferior = t->to_mourn_inferior;
+ t->to_mourn_inferior = amd64fbsd_mourn_inferior;
+ t->to_read_description = amd64fbsd_read_description;
-/* Provide a prototype to silence -Wmissing-prototypes. */
-void _initialize_amd64fbsd_nat (void);
+ fbsd_nat_add_target (t);
-void
-_initialize_am64fbsd_nat (void)
-{
- int offset;
+ /* Support debugging kernel virtual memory images. */
+ bsd_kvm_add_target (amd64fbsd_supply_pcb);
/* To support the recognition of signal handlers, i386bsd-tdep.c
hardcodes some constants. Inclusion of this file means that we
pointer since these members of `struct sigcontext' are essential
for providing backtraces. */
-#define SC_RIP_OFFSET SC_REG_OFFSET[X86_64_RIP_REGNUM]
-#define SC_RSP_OFFSET SC_REG_OFFSET[X86_64_RSP_REGNUM]
-#define SC_RBP_OFFSET SC_REG_OFFSET[X86_64_RBP_REGNUM]
+#define SC_RIP_OFFSET SC_REG_OFFSET[AMD64_RIP_REGNUM]
+#define SC_RSP_OFFSET SC_REG_OFFSET[AMD64_RSP_REGNUM]
+#define SC_RBP_OFFSET SC_REG_OFFSET[AMD64_RBP_REGNUM]
/* Override the default value for the offset of the program counter
in the sigcontext structure. */
if (SC_RIP_OFFSET != offset)
{
- warning ("\
+ warning (_("\
offsetof (struct sigcontext, sc_rip) yields %d instead of %d.\n\
-Please report this to <bug-gdb@gnu.org>.",
+Please report this to <bug-gdb@gnu.org>."),
offset, SC_RIP_OFFSET);
}
if (SC_RSP_OFFSET != offset)
{
- warning ("\
+ warning (_("\
offsetof (struct sigcontext, sc_rsp) yields %d instead of %d.\n\
-Please report this to <bug-gdb@gnu.org>.",
+Please report this to <bug-gdb@gnu.org>."),
offset, SC_RSP_OFFSET);
}
if (SC_RBP_OFFSET != offset)
{
- warning ("\
+ warning (_("\
offsetof (struct sigcontext, sc_rbp) yields %d instead of %d.\n\
-Please report this to <bug-gdb@gnu.org>.",
+Please report this to <bug-gdb@gnu.org>."),
offset, SC_RBP_OFFSET);
}
SC_RBP_OFFSET = offset;
- /* FreeBSD 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_PROC_SIGTRAMP
+ /* Normally signal frames are detected via amd64fbsd_sigtramp_p.
+ However, FreeBSD 9.2 through 10.1 do not include the page holding
+ the signal code in core dumps. These releases do provide a
+ kern.proc.sigtramp.<pid> sysctl that returns the location of the
+ signal trampoline for a running process. We fetch the location
+ of the current (gdb) process and use this to identify signal
+ frames in core dumps from these releases. Note that this only
+ works for core dumps of 64-bit (FreeBSD/amd64) processes and does
+ not handle core dumps of 32-bit (FreeBSD/i386) processes. */
{
- int mib[2];
- int ps_strings;
+ int mib[4];
+ struct kinfo_sigtramp kst;
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)
+ mib[1] = KERN_PROC;
+ mib[2] = KERN_PROC_SIGTRAMP;
+ mib[3] = getpid ();
+ len = sizeof (kst);
+ if (sysctl (mib, 4, &kst, &len, NULL, 0) == 0)
{
- amd64fbsd_sigtramp_start = ps_strings - 32;
- amd64fbsd_sigtramp_end = ps_strings;
+ amd64fbsd_sigtramp_start_addr = (uintptr_t) kst.ksigtramp_start;
+ amd64fbsd_sigtramp_end_addr = (uintptr_t) kst.ksigtramp_end;
}
}
+#endif
}
projects / deliverable / binutils-gdb.git / blobdiff