mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-11-27 03:54:41 +08:00
a9ed7a0814
This reverts commit 98bcde5e26. This
commit was causing build problems on at least sparc, ppc, and s390,
though I suspect some other targets might be impacted too.
692 lines
17 KiB
C++
692 lines
17 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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windows_thread_info *th = (windows_thread_info *) thread_target_data (thread);
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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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for_each_thread (current_thread->id.pid (), 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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for_each_thread (current_thread->id.pid (), 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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windows_thread_info *th
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= (windows_thread_info *) thread_target_data (current_thread);
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win32_require_context (th);
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#ifdef __x86_64__
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#define RET_DR(DR) \
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case DR: \
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return th->wow64_context.Dr ## DR
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if (windows_process.wow64_process)
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{
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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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}
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else
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#undef RET_DR
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#endif
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#define RET_DR(DR) \
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case DR: \
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return th->context.Dr ## DR
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{
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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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}
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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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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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/* 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 = CONTEXT_EXTENDED_REGISTERS;
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again:
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#ifdef __x86_64__
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if (windows_process.wow64_process)
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th->wow64_context.ContextFlags = (CONTEXT_FULL
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| CONTEXT_FLOATING_POINT
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| CONTEXT_DEBUG_REGISTERS
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| extended_registers);
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else
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#endif
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th->context.ContextFlags = (CONTEXT_FULL
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| CONTEXT_FLOATING_POINT
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| CONTEXT_DEBUG_REGISTERS
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| extended_registers);
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BOOL ret;
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#ifdef __x86_64__
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if (windows_process.wow64_process)
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ret = Wow64GetThreadContext (th->h, &th->wow64_context);
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else
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#endif
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ret = GetThreadContext (th->h, &th->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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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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#ifdef __x86_64__
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if (windows_process.wow64_process)
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{
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th->wow64_context.Dr0 = dr->dr_mirror[0];
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th->wow64_context.Dr1 = dr->dr_mirror[1];
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th->wow64_context.Dr2 = dr->dr_mirror[2];
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th->wow64_context.Dr3 = dr->dr_mirror[3];
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/* th->wow64_context.Dr6 = dr->dr_status_mirror;
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FIXME: should we set dr6 also ?? */
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th->wow64_context.Dr7 = dr->dr_control_mirror;
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}
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else
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#endif
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{
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th->context.Dr0 = dr->dr_mirror[0];
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th->context.Dr1 = dr->dr_mirror[1];
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th->context.Dr2 = dr->dr_mirror[2];
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th->context.Dr3 = dr->dr_mirror[3];
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/* th->context.Dr6 = dr->dr_status_mirror;
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FIXME: should we set dr6 also ?? */
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th->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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#ifdef __x86_64__
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if (windows_process.wow64_process)
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th->wow64_context.EFlags |= FLAG_TRACE_BIT;
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else
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#endif
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th->context.EFlags |= FLAG_TRACE_BIT;
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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;
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#ifdef __x86_64__
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if (windows_process.wow64_process)
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context_offset = (char *) &th->wow64_context + mappings[r];
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else
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#endif
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context_offset = (char *) &th->context + mappings[r];
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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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|
}
|
|
else if (is_fop_register (r))
|
|
{
|
|
long l = (*((long *) context_offset) >> 16) & ((1 << 11) - 1);
|
|
supply_register (regcache, r, (char *) &l);
|
|
}
|
|
else
|
|
supply_register (regcache, r, context_offset);
|
|
}
|
|
|
|
/* Store a new register value into the thread context of TH. */
|
|
static void
|
|
i386_store_inferior_register (struct regcache *regcache,
|
|
windows_thread_info *th, int r)
|
|
{
|
|
const int *mappings;
|
|
#ifdef __x86_64__
|
|
if (!windows_process.wow64_process)
|
|
mappings = amd64_mappings;
|
|
else
|
|
#endif
|
|
mappings = i386_mappings;
|
|
|
|
char *context_offset;
|
|
#ifdef __x86_64__
|
|
if (windows_process.wow64_process)
|
|
context_offset = (char *) &th->wow64_context + mappings[r];
|
|
else
|
|
#endif
|
|
context_offset = (char *) &th->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);
|
|
win32_tdesc = tdesc;
|
|
#endif
|
|
|
|
tdesc = i386_create_target_description (X86_XSTATE_SSE_MASK, false, false);
|
|
init_target_desc (tdesc, i386_expedite_regs);
|
|
#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
|
|
};
|