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fab07978ec
This patch is part of a series that has the aim sharing the x86 Linux target description creation code between GDB and gdbserver. Within GDB part of this process involves reading the cs and ds state from the 'struct user_regs_struct' using a ptrace call. This isn't done by gdbserver, which is part of the motivation for this whole series; the approach gdbserver takes is inferior to the approach GDB takes (gdbserver relies on reading the file being debugged, and extracting similar information from the file headers). This commit moves the reading of cs and ds, which is used to figure out if a thread is 32-bit or 64-bit (or in x32 mode), into the gdb/nat directory so that the code can be shared with gdbserver, but at this point I'm not actually using the code in gdbserver, that will come later. As such there should be no user visible changes after this commit, GDB continues to do things as it did before (reading cs/ds), while gdbserver continues to use its own approach (which doesn't require reading cs/ds). Approved-By: John Baldwin <jhb@FreeBSD.org> Reviewed-By: Felix Willgerodt <felix.willgerodt@intel.com>
79 lines
2.4 KiB
C++
79 lines
2.4 KiB
C++
/* Native-dependent code for GNU/Linux x86 (i386 and x86-64).
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Copyright (C) 1999-2024 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 NAT_X86_LINUX_H
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#define NAT_X86_LINUX_H
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#include "nat/linux-nat.h"
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/* Set whether our local mirror of LWP's debug registers has been
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changed since the values were last written to the thread. Nonzero
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indicates that a change has been made, zero indicates no change. */
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extern void lwp_set_debug_registers_changed (struct lwp_info *lwp,
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int value);
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/* Return nonzero if our local mirror of LWP's debug registers has
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been changed since the values were last written to the thread,
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zero otherwise. */
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extern int lwp_debug_registers_changed (struct lwp_info *lwp);
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/* Function to call when a new thread is detected. */
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extern void x86_linux_new_thread (struct lwp_info *lwp);
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/* Function to call when a thread is being deleted. */
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extern void x86_linux_delete_thread (struct arch_lwp_info *arch_lwp);
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/* Function to call prior to resuming a thread. */
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extern void x86_linux_prepare_to_resume (struct lwp_info *lwp);
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/* Return value from x86_linux_ptrace_get_arch_size function. Indicates if
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a thread is 32-bit, 64-bit, or x32. */
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struct x86_linux_arch_size
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{
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explicit x86_linux_arch_size (bool is_64bit, bool is_x32)
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: m_is_64bit (is_64bit),
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m_is_x32 (is_x32)
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{
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/* Nothing. */
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}
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bool is_64bit () const
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{ return m_is_64bit; }
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bool is_x32 () const
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{ return m_is_x32; }
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private:
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bool m_is_64bit = false;
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bool m_is_x32 = false;
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};
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/* Use ptrace calls to figure out if thread TID is 32-bit, 64-bit, or
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64-bit running in x32 mode. */
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extern x86_linux_arch_size x86_linux_ptrace_get_arch_size (int tid);
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#endif /* NAT_X86_LINUX_H */
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