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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.
36 lines
1.2 KiB
C
36 lines
1.2 KiB
C
/* Target-dependent code for FreeBSD x86.
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Copyright (C) 2015-2022 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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#ifndef I386_FBSD_TDEP_H
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#define I386_FBSD_TDEP_H
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#include "regset.h"
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/* Get XSAVE extended state xcr0 from core dump. */
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extern uint64_t i386fbsd_core_read_xcr0 (bfd *abfd);
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/* The format of the XSAVE extended area is determined by hardware.
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Cores store the XSAVE extended area in a NT_X86_XSTATE note that
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matches the layout on Linux. */
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#define I386_FBSD_XSAVE_XCR0_OFFSET 464
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extern const struct regset i386_fbsd_gregset;
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#endif /* i386-fbsd-tdep.h */
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