mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-09 04:21:49 +08:00
aa1402a95d
Earlier versions of the change in
1285ce8629 used this variable, but not
the final version that landed.
361 lines
10 KiB
C
361 lines
10 KiB
C
/* Native-dependent code for FreeBSD/i386.
|
||
|
||
Copyright (C) 2001-2022 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 <sys/types.h>
|
||
#include <sys/ptrace.h>
|
||
#include <sys/sysctl.h>
|
||
#include <sys/user.h>
|
||
|
||
#include "i386-tdep.h"
|
||
#include "i386-fbsd-tdep.h"
|
||
#include "i387-tdep.h"
|
||
#include "x86-nat.h"
|
||
#include "gdbsupport/x86-xstate.h"
|
||
#include "x86-fbsd-nat.h"
|
||
|
||
class i386_fbsd_nat_target final : public x86_fbsd_nat_target
|
||
{
|
||
public:
|
||
void fetch_registers (struct regcache *, int) override;
|
||
void store_registers (struct regcache *, int) override;
|
||
|
||
const struct target_desc *read_description () override;
|
||
|
||
void resume (ptid_t, int, enum gdb_signal) override;
|
||
};
|
||
|
||
static i386_fbsd_nat_target the_i386_fbsd_nat_target;
|
||
|
||
#ifdef PT_GETXSTATE_INFO
|
||
static size_t xsave_len;
|
||
#endif
|
||
|
||
static int have_ptrace_xmmregs;
|
||
|
||
/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
|
||
for all registers. */
|
||
|
||
void
|
||
i386_fbsd_nat_target::fetch_registers (struct regcache *regcache, int regnum)
|
||
{
|
||
struct gdbarch *gdbarch = regcache->arch ();
|
||
pid_t pid = get_ptrace_pid (regcache->ptid ());
|
||
|
||
if (fetch_register_set<struct reg> (regcache, regnum, PT_GETREGS,
|
||
&i386_fbsd_gregset))
|
||
{
|
||
if (regnum != -1)
|
||
return;
|
||
}
|
||
|
||
#ifdef PT_GETFSBASE
|
||
if (regnum == -1 || regnum == I386_FSBASE_REGNUM)
|
||
{
|
||
register_t base;
|
||
|
||
if (ptrace (PT_GETFSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
|
||
perror_with_name (_("Couldn't get segment register fs_base"));
|
||
|
||
regcache->raw_supply (I386_FSBASE_REGNUM, &base);
|
||
if (regnum != -1)
|
||
return;
|
||
}
|
||
#endif
|
||
#ifdef PT_GETGSBASE
|
||
if (regnum == -1 || regnum == I386_GSBASE_REGNUM)
|
||
{
|
||
register_t base;
|
||
|
||
if (ptrace (PT_GETGSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
|
||
perror_with_name (_("Couldn't get segment register gs_base"));
|
||
|
||
regcache->raw_supply (I386_GSBASE_REGNUM, &base);
|
||
if (regnum != -1)
|
||
return;
|
||
}
|
||
#endif
|
||
|
||
/* There is no i386_fxsave_supplies or i386_xsave_supplies.
|
||
Instead, the earlier register sets return early if the request
|
||
was for a specific register that was already satisified to avoid
|
||
fetching the FPU/XSAVE state unnecessarily. */
|
||
|
||
#ifdef PT_GETXSTATE_INFO
|
||
if (xsave_len != 0)
|
||
{
|
||
void *xstateregs = alloca (xsave_len);
|
||
|
||
if (ptrace (PT_GETXSTATE, pid, (PTRACE_TYPE_ARG3) xstateregs, 0) == -1)
|
||
perror_with_name (_("Couldn't get extended state status"));
|
||
|
||
i387_supply_xsave (regcache, regnum, xstateregs);
|
||
return;
|
||
}
|
||
#endif
|
||
if (have_ptrace_xmmregs != 0)
|
||
{
|
||
char xmmregs[I387_SIZEOF_FXSAVE];
|
||
|
||
if (ptrace(PT_GETXMMREGS, pid, (PTRACE_TYPE_ARG3) xmmregs, 0) == -1)
|
||
perror_with_name (_("Couldn't get XMM registers"));
|
||
|
||
i387_supply_fxsave (regcache, regnum, xmmregs);
|
||
return;
|
||
}
|
||
|
||
struct fpreg fpregs;
|
||
|
||
if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
|
||
perror_with_name (_("Couldn't get floating point status"));
|
||
|
||
i387_supply_fsave (regcache, regnum, &fpregs);
|
||
}
|
||
|
||
/* Store register REGNUM back into the inferior. If REGNUM is -1, do
|
||
this for all registers. */
|
||
|
||
void
|
||
i386_fbsd_nat_target::store_registers (struct regcache *regcache, int regnum)
|
||
{
|
||
struct gdbarch *gdbarch = regcache->arch ();
|
||
pid_t pid = get_ptrace_pid (regcache->ptid ());
|
||
|
||
if (store_register_set<struct reg> (regcache, regnum, PT_GETREGS, PT_SETREGS,
|
||
&i386_fbsd_gregset))
|
||
{
|
||
if (regnum != -1)
|
||
return;
|
||
}
|
||
|
||
#ifdef PT_SETFSBASE
|
||
if (regnum == -1 || regnum == I386_FSBASE_REGNUM)
|
||
{
|
||
register_t base;
|
||
|
||
regcache->raw_collect (I386_FSBASE_REGNUM, &base);
|
||
|
||
if (ptrace (PT_SETFSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
|
||
perror_with_name (_("Couldn't write segment register fs_base"));
|
||
if (regnum != -1)
|
||
return;
|
||
}
|
||
#endif
|
||
#ifdef PT_SETGSBASE
|
||
if (regnum == -1 || regnum == I386_GSBASE_REGNUM)
|
||
{
|
||
register_t base;
|
||
|
||
regcache->raw_collect (I386_GSBASE_REGNUM, &base);
|
||
|
||
if (ptrace (PT_SETGSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
|
||
perror_with_name (_("Couldn't write segment register gs_base"));
|
||
if (regnum != -1)
|
||
return;
|
||
}
|
||
#endif
|
||
|
||
/* There is no i386_fxsave_supplies or i386_xsave_supplies.
|
||
Instead, the earlier register sets return early if the request
|
||
was for a specific register that was already satisified to avoid
|
||
fetching the FPU/XSAVE state unnecessarily. */
|
||
|
||
#ifdef PT_GETXSTATE_INFO
|
||
if (xsave_len != 0)
|
||
{
|
||
void *xstateregs = alloca (xsave_len);
|
||
|
||
if (ptrace (PT_GETXSTATE, pid, (PTRACE_TYPE_ARG3) xstateregs, 0) == -1)
|
||
perror_with_name (_("Couldn't get extended state status"));
|
||
|
||
i387_collect_xsave (regcache, regnum, xstateregs, 0);
|
||
|
||
if (ptrace (PT_SETXSTATE, pid, (PTRACE_TYPE_ARG3) xstateregs, xsave_len)
|
||
== -1)
|
||
perror_with_name (_("Couldn't write extended state status"));
|
||
return;
|
||
}
|
||
#endif
|
||
if (have_ptrace_xmmregs != 0)
|
||
{
|
||
char xmmregs[I387_SIZEOF_FXSAVE];
|
||
|
||
if (ptrace(PT_GETXMMREGS, pid, (PTRACE_TYPE_ARG3) xmmregs, 0) == -1)
|
||
perror_with_name (_("Couldn't get XMM registers"));
|
||
|
||
i387_collect_fxsave (regcache, regnum, xmmregs);
|
||
|
||
if (ptrace (PT_SETXMMREGS, pid, (PTRACE_TYPE_ARG3) xmmregs, 0) == -1)
|
||
perror_with_name (_("Couldn't write XMM registers"));
|
||
return;
|
||
}
|
||
|
||
struct fpreg fpregs;
|
||
|
||
if (ptrace (PT_GETFPREGS, pid, (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, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
|
||
perror_with_name (_("Couldn't write floating point status"));
|
||
}
|
||
|
||
/* Resume execution of the inferior process. If STEP is nonzero,
|
||
single-step it. If SIGNAL is nonzero, give it that signal. */
|
||
|
||
void
|
||
i386_fbsd_nat_target::resume (ptid_t ptid, int step, enum gdb_signal signal)
|
||
{
|
||
pid_t pid = ptid.pid ();
|
||
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 = inferior_ptid.pid ();
|
||
|
||
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"));
|
||
}
|
||
|
||
|
||
/* Support for debugging kernel virtual memory images. */
|
||
|
||
#include <machine/pcb.h>
|
||
|
||
#include "bsd-kvm.h"
|
||
|
||
static int
|
||
i386fbsd_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 (I386_EDI_REGNUM, &pcb->pcb_edi);
|
||
regcache->raw_supply (I386_ESI_REGNUM, &pcb->pcb_esi);
|
||
regcache->raw_supply (I386_EBP_REGNUM, &pcb->pcb_ebp);
|
||
regcache->raw_supply (I386_ESP_REGNUM, &pcb->pcb_esp);
|
||
regcache->raw_supply (I386_EBX_REGNUM, &pcb->pcb_ebx);
|
||
regcache->raw_supply (I386_EIP_REGNUM, &pcb->pcb_eip);
|
||
regcache->raw_supply (I386_GS_REGNUM, &pcb->pcb_gs);
|
||
|
||
return 1;
|
||
}
|
||
|
||
|
||
/* Implement the read_description method. */
|
||
|
||
const struct target_desc *
|
||
i386_fbsd_nat_target::read_description ()
|
||
{
|
||
#ifdef PT_GETXSTATE_INFO
|
||
static int xsave_probed;
|
||
static uint64_t xcr0;
|
||
#endif
|
||
static int xmm_probed;
|
||
|
||
#ifdef PT_GETXSTATE_INFO
|
||
if (!xsave_probed)
|
||
{
|
||
struct ptrace_xstate_info info;
|
||
|
||
if (ptrace (PT_GETXSTATE_INFO, inferior_ptid.pid (),
|
||
(PTRACE_TYPE_ARG3) &info, sizeof (info)) == 0)
|
||
{
|
||
xsave_len = info.xsave_len;
|
||
xcr0 = info.xsave_mask;
|
||
}
|
||
xsave_probed = 1;
|
||
}
|
||
|
||
if (xsave_len != 0)
|
||
return i386_target_description (xcr0, true);
|
||
#endif
|
||
|
||
if (!xmm_probed)
|
||
{
|
||
char xmmregs[I387_SIZEOF_FXSAVE];
|
||
|
||
if (ptrace (PT_GETXMMREGS, inferior_ptid.pid (),
|
||
(PTRACE_TYPE_ARG3) xmmregs, 0) == 0)
|
||
have_ptrace_xmmregs = 1;
|
||
xmm_probed = 1;
|
||
}
|
||
|
||
if (have_ptrace_xmmregs)
|
||
return i386_target_description (X86_XSTATE_SSE_MASK, true);
|
||
|
||
return i386_target_description (X86_XSTATE_X87_MASK, true);
|
||
}
|
||
|
||
void _initialize_i386fbsd_nat ();
|
||
void
|
||
_initialize_i386fbsd_nat ()
|
||
{
|
||
add_inf_child_target (&the_i386_fbsd_nat_target);
|
||
|
||
/* Support debugging kernel virtual memory images. */
|
||
bsd_kvm_add_target (i386fbsd_supply_pcb);
|
||
}
|