mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2025-04-06 14:21:43 +08:00
b2682eade4
Currently we have duplicate code for each place where
windows_thread_info::context is touched, since for WOW64 processes
it has to do the equivalent with wow64_context instead.
For example this code...:
#ifdef __x86_64__
if (windows_process.wow64_process)
{
th->wow64_context.ContextFlags = WOW64_CONTEXT_ALL;
CHECK (Wow64GetThreadContext (th->h, &th->wow64_context));
...
}
else
#endif
{
th->context.ContextFlags = CONTEXT_DEBUGGER_DR;
CHECK (GetThreadContext (th->h, &th->context));
...
}
...changes to look like this instead:
windows_process.with_context (th, [&] (auto *context)
{
context->ContextFlags = WindowsContext<decltype(context)>::all;
CHECK (get_thread_context (th->h, context));
...
}
The actual choice if context or wow64_context are used, is handled by
this new function in windows_process_info:
template<typename Function>
auto with_context (windows_thread_info *th, Function function)
{
#ifdef __x86_64__
if (wow64_process)
return function (th != nullptr ? th->wow64_context : nullptr);
else
#endif
return function (th != nullptr ? th->context : nullptr);
}
The other parts to make this work are the templated WindowsContext class
which give the appropriate ContextFlags for both types.
And there are also overloaded helper functions, like in the case of
get_thread_context here, call either GetThreadContext or
Wow64GetThreadContext.
According git log --stat, this results in 120 lines less code.
Approved-By: Tom Tromey <tom@tromey.com>
642 lines
16 KiB
C++
642 lines
16 KiB
C++
/* Copyright (C) 2007-2024 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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#include "win32-low.h"
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#include "x86-low.h"
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#include "gdbsupport/x86-xstate.h"
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#ifdef __x86_64__
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#include "arch/amd64.h"
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#endif
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#include "arch/i386.h"
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#include "tdesc.h"
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#include "x86-tdesc.h"
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using namespace windows_nat;
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#ifndef CONTEXT_EXTENDED_REGISTERS
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#define CONTEXT_EXTENDED_REGISTERS 0
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#endif
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#define I386_FISEG_REGNUM 27
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#define I386_FOP_REGNUM 31
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#define I386_CS_REGNUM 10
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#define I386_GS_REGNUM 15
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#define AMD64_FISEG_REGNUM 35
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#define AMD64_FOP_REGNUM 39
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#define AMD64_CS_REGNUM 18
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#define AMD64_GS_REGNUM 23
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#define FLAG_TRACE_BIT 0x100
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static struct x86_debug_reg_state debug_reg_state;
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static void
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update_debug_registers (thread_info *thread)
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{
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auto th = static_cast<windows_thread_info *> (thread->target_data ());
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/* The actual update is done later just before resuming the lwp,
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we just mark that the registers need updating. */
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th->debug_registers_changed = true;
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}
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/* Update the inferior's debug register REGNUM from STATE. */
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static void
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x86_dr_low_set_addr (int regnum, CORE_ADDR addr)
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{
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gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR);
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/* Only update the threads of this process. */
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current_process ()->for_each_thread (update_debug_registers);
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}
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/* Update the inferior's DR7 debug control register from STATE. */
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static void
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x86_dr_low_set_control (unsigned long control)
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{
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/* Only update the threads of this process. */
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current_process ()->for_each_thread (update_debug_registers);
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}
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/* Return the current value of a DR register of the current thread's
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context. */
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static DWORD64
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win32_get_current_dr (int dr)
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{
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auto th
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= static_cast<windows_thread_info *> (current_thread->target_data ());
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win32_require_context (th);
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return windows_process.with_context (th, [&] (auto *context) -> DWORD64
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{
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#define RET_DR(DR) \
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case DR: \
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return context->Dr ## DR
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switch (dr)
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{
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RET_DR (0);
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RET_DR (1);
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RET_DR (2);
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RET_DR (3);
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RET_DR (6);
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RET_DR (7);
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}
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#undef RET_DR
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gdb_assert_not_reached ("unhandled dr");
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});
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}
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static CORE_ADDR
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x86_dr_low_get_addr (int regnum)
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{
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gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR);
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return win32_get_current_dr (regnum - DR_FIRSTADDR);
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}
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static unsigned long
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x86_dr_low_get_control (void)
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{
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return win32_get_current_dr (7);
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}
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/* Get the value of the DR6 debug status register from the inferior
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and record it in STATE. */
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static unsigned long
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x86_dr_low_get_status (void)
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{
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return win32_get_current_dr (6);
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}
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/* Low-level function vector. */
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struct x86_dr_low_type x86_dr_low =
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{
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x86_dr_low_set_control,
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x86_dr_low_set_addr,
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x86_dr_low_get_addr,
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x86_dr_low_get_status,
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x86_dr_low_get_control,
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sizeof (void *),
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};
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/* Breakpoint/watchpoint support. */
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static int
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i386_supports_z_point_type (char z_type)
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{
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switch (z_type)
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{
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case Z_PACKET_HW_BP:
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case Z_PACKET_WRITE_WP:
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case Z_PACKET_ACCESS_WP:
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return 1;
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default:
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return 0;
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}
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}
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static int
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i386_insert_point (enum raw_bkpt_type type, CORE_ADDR addr,
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int size, struct raw_breakpoint *bp)
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{
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switch (type)
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{
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case raw_bkpt_type_hw:
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case raw_bkpt_type_write_wp:
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case raw_bkpt_type_access_wp:
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{
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enum target_hw_bp_type hw_type
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= raw_bkpt_type_to_target_hw_bp_type (type);
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return x86_dr_insert_watchpoint (&debug_reg_state,
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hw_type, addr, size);
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}
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default:
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/* Unsupported. */
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return 1;
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}
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}
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static int
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i386_remove_point (enum raw_bkpt_type type, CORE_ADDR addr,
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int size, struct raw_breakpoint *bp)
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{
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switch (type)
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{
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case raw_bkpt_type_hw:
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case raw_bkpt_type_write_wp:
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case raw_bkpt_type_access_wp:
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{
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enum target_hw_bp_type hw_type
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= raw_bkpt_type_to_target_hw_bp_type (type);
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return x86_dr_remove_watchpoint (&debug_reg_state,
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hw_type, addr, size);
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}
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default:
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/* Unsupported. */
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return 1;
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}
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}
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static int
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x86_stopped_by_watchpoint (void)
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{
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return x86_dr_stopped_by_watchpoint (&debug_reg_state);
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}
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static CORE_ADDR
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x86_stopped_data_address (void)
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{
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CORE_ADDR addr;
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if (x86_dr_stopped_data_address (&debug_reg_state, &addr))
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return addr;
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return 0;
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}
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static void
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i386_initial_stuff (void)
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{
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x86_low_init_dregs (&debug_reg_state);
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}
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static void
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i386_get_thread_context (windows_thread_info *th)
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{
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windows_process.with_context (th, [&] (auto *context)
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{
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/* Requesting the CONTEXT_EXTENDED_REGISTERS register set fails if
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the system doesn't support extended registers. */
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static DWORD extended_registers
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= WindowsContext<decltype(context)>::extended;
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again:
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context->ContextFlags = (WindowsContext<decltype(context)>::full
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| WindowsContext<decltype(context)>::floating
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| WindowsContext<decltype(context)>::debug
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| extended_registers);
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BOOL ret = get_thread_context (th->h, context);
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if (!ret)
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{
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DWORD e = GetLastError ();
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if (extended_registers && e == ERROR_INVALID_PARAMETER)
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{
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extended_registers = 0;
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goto again;
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}
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error ("GetThreadContext failure %ld\n", (long) e);
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}
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});
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}
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static void
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i386_prepare_to_resume (windows_thread_info *th)
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{
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if (th->debug_registers_changed)
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{
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struct x86_debug_reg_state *dr = &debug_reg_state;
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win32_require_context (th);
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windows_process.with_context (th, [&] (auto *context)
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{
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context->Dr0 = dr->dr_mirror[0];
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context->Dr1 = dr->dr_mirror[1];
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context->Dr2 = dr->dr_mirror[2];
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context->Dr3 = dr->dr_mirror[3];
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/* context->Dr6 = dr->dr_status_mirror;
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FIXME: should we set dr6 also ?? */
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context->Dr7 = dr->dr_control_mirror;
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});
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th->debug_registers_changed = false;
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}
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}
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static void
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i386_thread_added (windows_thread_info *th)
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{
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th->debug_registers_changed = true;
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}
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static void
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i386_single_step (windows_thread_info *th)
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{
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windows_process.with_context (th, [] (auto *context)
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{
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context->EFlags |= FLAG_TRACE_BIT;
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});
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}
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/* An array of offset mappings into a Win32 Context structure.
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This is a one-to-one mapping which is indexed by gdb's register
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numbers. It retrieves an offset into the context structure where
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the 4 byte register is located.
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An offset value of -1 indicates that Win32 does not provide this
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register in it's CONTEXT structure. In this case regptr will return
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a pointer into a dummy register. */
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#ifdef __x86_64__
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#define context_offset(x) (offsetof (WOW64_CONTEXT, x))
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#else
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#define context_offset(x) ((int)&(((CONTEXT *)NULL)->x))
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#endif
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static const int i386_mappings[] = {
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context_offset (Eax),
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context_offset (Ecx),
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context_offset (Edx),
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context_offset (Ebx),
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context_offset (Esp),
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context_offset (Ebp),
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context_offset (Esi),
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context_offset (Edi),
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context_offset (Eip),
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context_offset (EFlags),
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context_offset (SegCs),
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context_offset (SegSs),
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context_offset (SegDs),
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context_offset (SegEs),
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context_offset (SegFs),
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context_offset (SegGs),
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context_offset (FloatSave.RegisterArea[0 * 10]),
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context_offset (FloatSave.RegisterArea[1 * 10]),
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context_offset (FloatSave.RegisterArea[2 * 10]),
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context_offset (FloatSave.RegisterArea[3 * 10]),
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context_offset (FloatSave.RegisterArea[4 * 10]),
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context_offset (FloatSave.RegisterArea[5 * 10]),
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context_offset (FloatSave.RegisterArea[6 * 10]),
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context_offset (FloatSave.RegisterArea[7 * 10]),
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context_offset (FloatSave.ControlWord),
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context_offset (FloatSave.StatusWord),
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context_offset (FloatSave.TagWord),
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context_offset (FloatSave.ErrorSelector),
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context_offset (FloatSave.ErrorOffset),
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context_offset (FloatSave.DataSelector),
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context_offset (FloatSave.DataOffset),
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context_offset (FloatSave.ErrorSelector),
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/* XMM0-7 */
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context_offset (ExtendedRegisters[10 * 16]),
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context_offset (ExtendedRegisters[11 * 16]),
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context_offset (ExtendedRegisters[12 * 16]),
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context_offset (ExtendedRegisters[13 * 16]),
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context_offset (ExtendedRegisters[14 * 16]),
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context_offset (ExtendedRegisters[15 * 16]),
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context_offset (ExtendedRegisters[16 * 16]),
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context_offset (ExtendedRegisters[17 * 16]),
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/* MXCSR */
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context_offset (ExtendedRegisters[24])
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};
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#undef context_offset
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#ifdef __x86_64__
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#define context_offset(x) (offsetof (CONTEXT, x))
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static const int amd64_mappings[] =
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{
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context_offset (Rax),
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context_offset (Rbx),
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context_offset (Rcx),
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context_offset (Rdx),
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context_offset (Rsi),
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context_offset (Rdi),
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context_offset (Rbp),
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context_offset (Rsp),
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context_offset (R8),
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context_offset (R9),
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context_offset (R10),
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context_offset (R11),
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context_offset (R12),
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context_offset (R13),
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context_offset (R14),
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context_offset (R15),
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context_offset (Rip),
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context_offset (EFlags),
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context_offset (SegCs),
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context_offset (SegSs),
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context_offset (SegDs),
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context_offset (SegEs),
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context_offset (SegFs),
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context_offset (SegGs),
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context_offset (FloatSave.FloatRegisters[0]),
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context_offset (FloatSave.FloatRegisters[1]),
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context_offset (FloatSave.FloatRegisters[2]),
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context_offset (FloatSave.FloatRegisters[3]),
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context_offset (FloatSave.FloatRegisters[4]),
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context_offset (FloatSave.FloatRegisters[5]),
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context_offset (FloatSave.FloatRegisters[6]),
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context_offset (FloatSave.FloatRegisters[7]),
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context_offset (FloatSave.ControlWord),
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context_offset (FloatSave.StatusWord),
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context_offset (FloatSave.TagWord),
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context_offset (FloatSave.ErrorSelector),
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context_offset (FloatSave.ErrorOffset),
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context_offset (FloatSave.DataSelector),
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context_offset (FloatSave.DataOffset),
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context_offset (FloatSave.ErrorSelector)
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/* XMM0-7 */ ,
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context_offset (Xmm0),
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context_offset (Xmm1),
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context_offset (Xmm2),
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context_offset (Xmm3),
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context_offset (Xmm4),
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context_offset (Xmm5),
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context_offset (Xmm6),
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context_offset (Xmm7),
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context_offset (Xmm8),
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context_offset (Xmm9),
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context_offset (Xmm10),
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context_offset (Xmm11),
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context_offset (Xmm12),
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context_offset (Xmm13),
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context_offset (Xmm14),
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context_offset (Xmm15),
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/* MXCSR */
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context_offset (FloatSave.MxCsr)
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};
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#undef context_offset
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#endif /* __x86_64__ */
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/* Return true if R is the FISEG register. */
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static bool
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is_fiseg_register (int r)
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{
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#ifdef __x86_64__
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if (!windows_process.wow64_process)
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return r == AMD64_FISEG_REGNUM;
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else
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#endif
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return r == I386_FISEG_REGNUM;
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}
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/* Return true if R is the FOP register. */
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static bool
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is_fop_register (int r)
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{
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#ifdef __x86_64__
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if (!windows_process.wow64_process)
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return r == AMD64_FOP_REGNUM;
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else
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#endif
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return r == I386_FOP_REGNUM;
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}
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/* Return true if R is a segment register. */
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static bool
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is_segment_register (int r)
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{
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#ifdef __x86_64__
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if (!windows_process.wow64_process)
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return r >= AMD64_CS_REGNUM && r <= AMD64_GS_REGNUM;
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else
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#endif
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return r >= I386_CS_REGNUM && r <= I386_GS_REGNUM;
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}
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/* Fetch register from gdbserver regcache data. */
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static void
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i386_fetch_inferior_register (struct regcache *regcache,
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windows_thread_info *th, int r)
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{
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const int *mappings;
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#ifdef __x86_64__
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if (!windows_process.wow64_process)
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mappings = amd64_mappings;
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else
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#endif
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mappings = i386_mappings;
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char *context_offset = windows_process.with_context (th, [&] (auto *context)
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{
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return (char *) context + mappings[r];
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});
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|
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/* GDB treats some registers as 32-bit, where they are in fact only
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16 bits long. These cases must be handled specially to avoid
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reading extraneous bits from the context. */
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if (is_fiseg_register (r) || is_segment_register (r))
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{
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gdb_byte bytes[4] = {};
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memcpy (bytes, context_offset, 2);
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supply_register (regcache, r, bytes);
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}
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else if (is_fop_register (r))
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{
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long l = (*((long *) context_offset) >> 16) & ((1 << 11) - 1);
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supply_register (regcache, r, (char *) &l);
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}
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else
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supply_register (regcache, r, context_offset);
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}
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/* Store a new register value into the thread context of TH. */
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static void
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i386_store_inferior_register (struct regcache *regcache,
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windows_thread_info *th, int r)
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{
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const int *mappings;
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#ifdef __x86_64__
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if (!windows_process.wow64_process)
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mappings = amd64_mappings;
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|
else
|
|
#endif
|
|
mappings = i386_mappings;
|
|
|
|
char *context_offset = windows_process.with_context (th, [&] (auto *context)
|
|
{
|
|
return (char *) context + mappings[r];
|
|
});
|
|
|
|
/* GDB treats some registers as 32-bit, where they are in fact only
|
|
16 bits long. These cases must be handled specially to avoid
|
|
overwriting other registers in the context. */
|
|
if (is_fiseg_register (r) || is_segment_register (r))
|
|
{
|
|
gdb_byte bytes[4];
|
|
collect_register (regcache, r, bytes);
|
|
memcpy (context_offset, bytes, 2);
|
|
}
|
|
else if (is_fop_register (r))
|
|
{
|
|
gdb_byte bytes[4];
|
|
collect_register (regcache, r, bytes);
|
|
/* The value of FOP occupies the top two bytes in the context,
|
|
so write the two low-order bytes from the cache into the
|
|
appropriate spot. */
|
|
memcpy (context_offset + 2, bytes, 2);
|
|
}
|
|
else
|
|
collect_register (regcache, r, context_offset);
|
|
}
|
|
|
|
static const unsigned char i386_win32_breakpoint = 0xcc;
|
|
#define i386_win32_breakpoint_len 1
|
|
|
|
static void
|
|
i386_arch_setup (void)
|
|
{
|
|
struct target_desc *tdesc;
|
|
|
|
#ifdef __x86_64__
|
|
tdesc = amd64_create_target_description (X86_XSTATE_SSE_MASK, false,
|
|
false, false);
|
|
init_target_desc (tdesc, amd64_expedite_regs, WINDOWS_OSABI);
|
|
win32_tdesc = tdesc;
|
|
#endif
|
|
|
|
tdesc = i386_create_target_description (X86_XSTATE_SSE_MASK, false, false);
|
|
init_target_desc (tdesc, i386_expedite_regs, WINDOWS_OSABI);
|
|
#ifdef __x86_64__
|
|
wow64_win32_tdesc = tdesc;
|
|
#else
|
|
win32_tdesc = tdesc;
|
|
#endif
|
|
}
|
|
|
|
/* Implement win32_target_ops "num_regs" method. */
|
|
|
|
static int
|
|
i386_win32_num_regs (void)
|
|
{
|
|
int num_regs;
|
|
#ifdef __x86_64__
|
|
if (!windows_process.wow64_process)
|
|
num_regs = sizeof (amd64_mappings) / sizeof (amd64_mappings[0]);
|
|
else
|
|
#endif
|
|
num_regs = sizeof (i386_mappings) / sizeof (i386_mappings[0]);
|
|
return num_regs;
|
|
}
|
|
|
|
/* Implement win32_target_ops "get_pc" method. */
|
|
|
|
static CORE_ADDR
|
|
i386_win32_get_pc (struct regcache *regcache)
|
|
{
|
|
bool use_64bit = register_size (regcache->tdesc, 0) == 8;
|
|
|
|
if (use_64bit)
|
|
{
|
|
uint64_t pc;
|
|
|
|
collect_register_by_name (regcache, "rip", &pc);
|
|
return (CORE_ADDR) pc;
|
|
}
|
|
else
|
|
{
|
|
uint32_t pc;
|
|
|
|
collect_register_by_name (regcache, "eip", &pc);
|
|
return (CORE_ADDR) pc;
|
|
}
|
|
}
|
|
|
|
/* Implement win32_target_ops "set_pc" method. */
|
|
|
|
static void
|
|
i386_win32_set_pc (struct regcache *regcache, CORE_ADDR pc)
|
|
{
|
|
bool use_64bit = register_size (regcache->tdesc, 0) == 8;
|
|
|
|
if (use_64bit)
|
|
{
|
|
uint64_t newpc = pc;
|
|
|
|
supply_register_by_name (regcache, "rip", &newpc);
|
|
}
|
|
else
|
|
{
|
|
uint32_t newpc = pc;
|
|
|
|
supply_register_by_name (regcache, "eip", &newpc);
|
|
}
|
|
}
|
|
|
|
struct win32_target_ops the_low_target = {
|
|
i386_arch_setup,
|
|
i386_win32_num_regs,
|
|
i386_initial_stuff,
|
|
i386_get_thread_context,
|
|
i386_prepare_to_resume,
|
|
i386_thread_added,
|
|
i386_fetch_inferior_register,
|
|
i386_store_inferior_register,
|
|
i386_single_step,
|
|
&i386_win32_breakpoint,
|
|
i386_win32_breakpoint_len,
|
|
1,
|
|
i386_win32_get_pc,
|
|
i386_win32_set_pc,
|
|
i386_supports_z_point_type,
|
|
i386_insert_point,
|
|
i386_remove_point,
|
|
x86_stopped_by_watchpoint,
|
|
x86_stopped_data_address
|
|
};
|