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00d7af046f
Rather than using the x86-specific register offset tables, use register maps to describe the layout of the general purpose registers fetched via PT_GETREGS. The sole user-visible difference is that FreeBSD/amd64 will now report additional segment registers ($ds, $es, $fs, and $gs) for both 32-bit and 64-bit processes. As part of these changes, the FreeBSD x86 native targets no longer use amd64-bsd-nat.c or i386-bsd-nat.c. Remove FreeBSD-specific register handling (for $fs_base, $gs_base, and XSAVE state) from these files. Similarly, remove the global x86bsd_xsave_len from x86-bsd-nat.c. The FreeBSD x86 native targets use a static xsave_len instead. While here, rework the probing of PT_GETXMMREGS on FreeBSD/i386. Probe the ptrace op once in the target read_description method and cache the result for the future similar to the way the status of XSAVE support is probed in the read_description method. In addition, return the proper xcr0 mask (X87-only) for old kernels or systems without either XSAVE or XMM support.
124 lines
3.8 KiB
C
124 lines
3.8 KiB
C
/* Native-dependent code for AMD64 BSD's.
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Copyright (C) 2003-2022 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "inferior.h"
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#include "regcache.h"
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#include "target.h"
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/* We include <signal.h> to make sure `struct fxsave64' is defined on
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NetBSD, since NetBSD's <machine/reg.h> needs it. */
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#include <signal.h>
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#include <sys/types.h>
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#include <sys/ptrace.h>
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#include <machine/reg.h>
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#include "amd64-tdep.h"
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#include "amd64-nat.h"
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#include "x86-bsd-nat.h"
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#include "inf-ptrace.h"
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#include "amd64-bsd-nat.h"
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static PTRACE_TYPE_RET
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gdb_ptrace (PTRACE_TYPE_ARG1 request, ptid_t ptid, PTRACE_TYPE_ARG3 addr,
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PTRACE_TYPE_ARG4 data)
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{
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#ifdef __NetBSD__
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gdb_assert (data == 0);
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/* Support for NetBSD threads: unlike other ptrace implementations in this
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file, NetBSD requires that we pass both the pid and lwp. */
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return ptrace (request, ptid.pid (), addr, ptid.lwp ());
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#else
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pid_t pid = get_ptrace_pid (ptid);
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return ptrace (request, pid, addr, data);
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#endif
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}
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/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
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for all registers (including the floating-point registers). */
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void
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amd64bsd_fetch_inferior_registers (struct regcache *regcache, int regnum)
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{
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struct gdbarch *gdbarch = regcache->arch ();
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ptid_t ptid = regcache->ptid ();
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if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum))
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{
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struct reg regs;
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if (gdb_ptrace (PT_GETREGS, ptid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
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perror_with_name (_("Couldn't get registers"));
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amd64_supply_native_gregset (regcache, ®s, -1);
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if (regnum != -1)
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return;
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}
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if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum))
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{
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struct fpreg fpregs;
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if (gdb_ptrace (PT_GETFPREGS, ptid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
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perror_with_name (_("Couldn't get floating point status"));
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amd64_supply_fxsave (regcache, -1, &fpregs);
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}
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}
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/* Store register REGNUM back into the inferior. If REGNUM is -1, do
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this for all registers (including the floating-point registers). */
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void
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amd64bsd_store_inferior_registers (struct regcache *regcache, int regnum)
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{
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struct gdbarch *gdbarch = regcache->arch ();
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ptid_t ptid = regcache->ptid ();
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if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum))
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{
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struct reg regs;
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if (gdb_ptrace (PT_GETREGS, ptid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
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perror_with_name (_("Couldn't get registers"));
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amd64_collect_native_gregset (regcache, ®s, regnum);
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if (gdb_ptrace (PT_SETREGS, ptid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
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perror_with_name (_("Couldn't write registers"));
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if (regnum != -1)
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return;
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}
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if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum))
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{
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struct fpreg fpregs;
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if (gdb_ptrace (PT_GETFPREGS, ptid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
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perror_with_name (_("Couldn't get floating point status"));
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amd64_collect_fxsave (regcache, regnum, &fpregs);
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if (gdb_ptrace (PT_SETFPREGS, ptid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
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perror_with_name (_("Couldn't write floating point status"));
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}
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}
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