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-rw-r--r--gdbserver/win32-i386-low.c468
1 files changed, 468 insertions, 0 deletions
diff --git a/gdbserver/win32-i386-low.c b/gdbserver/win32-i386-low.c
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+++ b/gdbserver/win32-i386-low.c
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+/* Copyright (C) 2007-2020 Free Software Foundation, Inc.
+
+ This file is part of GDB.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+#include "server.h"
+#include "win32-low.h"
+#include "x86-low.h"
+#include "gdbsupport/x86-xstate.h"
+#ifdef __x86_64__
+#include "arch/amd64.h"
+#endif
+#include "arch/i386.h"
+#include "tdesc.h"
+#include "x86-tdesc.h"
+
+#ifndef CONTEXT_EXTENDED_REGISTERS
+#define CONTEXT_EXTENDED_REGISTERS 0
+#endif
+
+#define FCS_REGNUM 27
+#define FOP_REGNUM 31
+
+#define FLAG_TRACE_BIT 0x100
+
+static struct x86_debug_reg_state debug_reg_state;
+
+static void
+update_debug_registers (thread_info *thread)
+{
+ win32_thread_info *th = (win32_thread_info *) thread_target_data (thread);
+
+ /* The actual update is done later just before resuming the lwp,
+ we just mark that the registers need updating. */
+ th->debug_registers_changed = 1;
+}
+
+/* Update the inferior's debug register REGNUM from STATE. */
+
+static void
+x86_dr_low_set_addr (int regnum, CORE_ADDR addr)
+{
+ gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR);
+
+ /* Only update the threads of this process. */
+ for_each_thread (current_thread->id.pid (), update_debug_registers);
+}
+
+/* Update the inferior's DR7 debug control register from STATE. */
+
+static void
+x86_dr_low_set_control (unsigned long control)
+{
+ /* Only update the threads of this process. */
+ for_each_thread (current_thread->id.pid (), update_debug_registers);
+}
+
+/* Return the current value of a DR register of the current thread's
+ context. */
+
+static DWORD64
+win32_get_current_dr (int dr)
+{
+ win32_thread_info *th
+ = (win32_thread_info *) thread_target_data (current_thread);
+
+ win32_require_context (th);
+
+#define RET_DR(DR) \
+ case DR: \
+ return th->context.Dr ## DR
+
+ switch (dr)
+ {
+ RET_DR (0);
+ RET_DR (1);
+ RET_DR (2);
+ RET_DR (3);
+ RET_DR (6);
+ RET_DR (7);
+ }
+
+#undef RET_DR
+
+ gdb_assert_not_reached ("unhandled dr");
+}
+
+static CORE_ADDR
+x86_dr_low_get_addr (int regnum)
+{
+ gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR);
+
+ return win32_get_current_dr (regnum - DR_FIRSTADDR);
+}
+
+static unsigned long
+x86_dr_low_get_control (void)
+{
+ return win32_get_current_dr (7);
+}
+
+/* Get the value of the DR6 debug status register from the inferior
+ and record it in STATE. */
+
+static unsigned long
+x86_dr_low_get_status (void)
+{
+ return win32_get_current_dr (6);
+}
+
+/* Low-level function vector. */
+struct x86_dr_low_type x86_dr_low =
+ {
+ x86_dr_low_set_control,
+ x86_dr_low_set_addr,
+ x86_dr_low_get_addr,
+ x86_dr_low_get_status,
+ x86_dr_low_get_control,
+ sizeof (void *),
+ };
+
+/* Breakpoint/watchpoint support. */
+
+static int
+i386_supports_z_point_type (char z_type)
+{
+ switch (z_type)
+ {
+ case Z_PACKET_WRITE_WP:
+ case Z_PACKET_ACCESS_WP:
+ return 1;
+ default:
+ return 0;
+ }
+}
+
+static int
+i386_insert_point (enum raw_bkpt_type type, CORE_ADDR addr,
+ int size, struct raw_breakpoint *bp)
+{
+ switch (type)
+ {
+ case raw_bkpt_type_write_wp:
+ case raw_bkpt_type_access_wp:
+ {
+ enum target_hw_bp_type hw_type
+ = raw_bkpt_type_to_target_hw_bp_type (type);
+
+ return x86_dr_insert_watchpoint (&debug_reg_state,
+ hw_type, addr, size);
+ }
+ default:
+ /* Unsupported. */
+ return 1;
+ }
+}
+
+static int
+i386_remove_point (enum raw_bkpt_type type, CORE_ADDR addr,
+ int size, struct raw_breakpoint *bp)
+{
+ switch (type)
+ {
+ case raw_bkpt_type_write_wp:
+ case raw_bkpt_type_access_wp:
+ {
+ enum target_hw_bp_type hw_type
+ = raw_bkpt_type_to_target_hw_bp_type (type);
+
+ return x86_dr_remove_watchpoint (&debug_reg_state,
+ hw_type, addr, size);
+ }
+ default:
+ /* Unsupported. */
+ return 1;
+ }
+}
+
+static int
+x86_stopped_by_watchpoint (void)
+{
+ return x86_dr_stopped_by_watchpoint (&debug_reg_state);
+}
+
+static CORE_ADDR
+x86_stopped_data_address (void)
+{
+ CORE_ADDR addr;
+ if (x86_dr_stopped_data_address (&debug_reg_state, &addr))
+ return addr;
+ return 0;
+}
+
+static void
+i386_initial_stuff (void)
+{
+ x86_low_init_dregs (&debug_reg_state);
+}
+
+static void
+i386_get_thread_context (win32_thread_info *th)
+{
+ /* Requesting the CONTEXT_EXTENDED_REGISTERS register set fails if
+ the system doesn't support extended registers. */
+ static DWORD extended_registers = CONTEXT_EXTENDED_REGISTERS;
+
+ again:
+ th->context.ContextFlags = (CONTEXT_FULL
+ | CONTEXT_FLOATING_POINT
+ | CONTEXT_DEBUG_REGISTERS
+ | extended_registers);
+
+ if (!GetThreadContext (th->h, &th->context))
+ {
+ DWORD e = GetLastError ();
+
+ if (extended_registers && e == ERROR_INVALID_PARAMETER)
+ {
+ extended_registers = 0;
+ goto again;
+ }
+
+ error ("GetThreadContext failure %ld\n", (long) e);
+ }
+}
+
+static void
+i386_prepare_to_resume (win32_thread_info *th)
+{
+ if (th->debug_registers_changed)
+ {
+ struct x86_debug_reg_state *dr = &debug_reg_state;
+
+ win32_require_context (th);
+
+ th->context.Dr0 = dr->dr_mirror[0];
+ th->context.Dr1 = dr->dr_mirror[1];
+ th->context.Dr2 = dr->dr_mirror[2];
+ th->context.Dr3 = dr->dr_mirror[3];
+ /* th->context.Dr6 = dr->dr_status_mirror;
+ FIXME: should we set dr6 also ?? */
+ th->context.Dr7 = dr->dr_control_mirror;
+
+ th->debug_registers_changed = 0;
+ }
+}
+
+static void
+i386_thread_added (win32_thread_info *th)
+{
+ th->debug_registers_changed = 1;
+}
+
+static void
+i386_single_step (win32_thread_info *th)
+{
+ th->context.EFlags |= FLAG_TRACE_BIT;
+}
+
+#ifndef __x86_64__
+
+/* An array of offset mappings into a Win32 Context structure.
+ This is a one-to-one mapping which is indexed by gdb's register
+ numbers. It retrieves an offset into the context structure where
+ the 4 byte register is located.
+ An offset value of -1 indicates that Win32 does not provide this
+ register in it's CONTEXT structure. In this case regptr will return
+ a pointer into a dummy register. */
+#define context_offset(x) ((int)&(((CONTEXT *)NULL)->x))
+static const int mappings[] = {
+ context_offset (Eax),
+ context_offset (Ecx),
+ context_offset (Edx),
+ context_offset (Ebx),
+ context_offset (Esp),
+ context_offset (Ebp),
+ context_offset (Esi),
+ context_offset (Edi),
+ context_offset (Eip),
+ context_offset (EFlags),
+ context_offset (SegCs),
+ context_offset (SegSs),
+ context_offset (SegDs),
+ context_offset (SegEs),
+ context_offset (SegFs),
+ context_offset (SegGs),
+ context_offset (FloatSave.RegisterArea[0 * 10]),
+ context_offset (FloatSave.RegisterArea[1 * 10]),
+ context_offset (FloatSave.RegisterArea[2 * 10]),
+ context_offset (FloatSave.RegisterArea[3 * 10]),
+ context_offset (FloatSave.RegisterArea[4 * 10]),
+ context_offset (FloatSave.RegisterArea[5 * 10]),
+ context_offset (FloatSave.RegisterArea[6 * 10]),
+ context_offset (FloatSave.RegisterArea[7 * 10]),
+ context_offset (FloatSave.ControlWord),
+ context_offset (FloatSave.StatusWord),
+ context_offset (FloatSave.TagWord),
+ context_offset (FloatSave.ErrorSelector),
+ context_offset (FloatSave.ErrorOffset),
+ context_offset (FloatSave.DataSelector),
+ context_offset (FloatSave.DataOffset),
+ context_offset (FloatSave.ErrorSelector),
+ /* XMM0-7 */
+ context_offset (ExtendedRegisters[10 * 16]),
+ context_offset (ExtendedRegisters[11 * 16]),
+ context_offset (ExtendedRegisters[12 * 16]),
+ context_offset (ExtendedRegisters[13 * 16]),
+ context_offset (ExtendedRegisters[14 * 16]),
+ context_offset (ExtendedRegisters[15 * 16]),
+ context_offset (ExtendedRegisters[16 * 16]),
+ context_offset (ExtendedRegisters[17 * 16]),
+ /* MXCSR */
+ context_offset (ExtendedRegisters[24])
+};
+#undef context_offset
+
+#else /* __x86_64__ */
+
+#define context_offset(x) (offsetof (CONTEXT, x))
+static const int mappings[] =
+{
+ context_offset (Rax),
+ context_offset (Rbx),
+ context_offset (Rcx),
+ context_offset (Rdx),
+ context_offset (Rsi),
+ context_offset (Rdi),
+ context_offset (Rbp),
+ context_offset (Rsp),
+ context_offset (R8),
+ context_offset (R9),
+ context_offset (R10),
+ context_offset (R11),
+ context_offset (R12),
+ context_offset (R13),
+ context_offset (R14),
+ context_offset (R15),
+ context_offset (Rip),
+ context_offset (EFlags),
+ context_offset (SegCs),
+ context_offset (SegSs),
+ context_offset (SegDs),
+ context_offset (SegEs),
+ context_offset (SegFs),
+ context_offset (SegGs),
+ context_offset (FloatSave.FloatRegisters[0]),
+ context_offset (FloatSave.FloatRegisters[1]),
+ context_offset (FloatSave.FloatRegisters[2]),
+ context_offset (FloatSave.FloatRegisters[3]),
+ context_offset (FloatSave.FloatRegisters[4]),
+ context_offset (FloatSave.FloatRegisters[5]),
+ context_offset (FloatSave.FloatRegisters[6]),
+ context_offset (FloatSave.FloatRegisters[7]),
+ context_offset (FloatSave.ControlWord),
+ context_offset (FloatSave.StatusWord),
+ context_offset (FloatSave.TagWord),
+ context_offset (FloatSave.ErrorSelector),
+ context_offset (FloatSave.ErrorOffset),
+ context_offset (FloatSave.DataSelector),
+ context_offset (FloatSave.DataOffset),
+ context_offset (FloatSave.ErrorSelector)
+ /* XMM0-7 */ ,
+ context_offset (Xmm0),
+ context_offset (Xmm1),
+ context_offset (Xmm2),
+ context_offset (Xmm3),
+ context_offset (Xmm4),
+ context_offset (Xmm5),
+ context_offset (Xmm6),
+ context_offset (Xmm7),
+ context_offset (Xmm8),
+ context_offset (Xmm9),
+ context_offset (Xmm10),
+ context_offset (Xmm11),
+ context_offset (Xmm12),
+ context_offset (Xmm13),
+ context_offset (Xmm14),
+ context_offset (Xmm15),
+ /* MXCSR */
+ context_offset (FloatSave.MxCsr)
+};
+#undef context_offset
+
+#endif /* __x86_64__ */
+
+/* Fetch register from gdbserver regcache data. */
+static void
+i386_fetch_inferior_register (struct regcache *regcache,
+ win32_thread_info *th, int r)
+{
+ char *context_offset = (char *) &th->context + mappings[r];
+
+ long l;
+ if (r == FCS_REGNUM)
+ {
+ l = *((long *) context_offset) & 0xffff;
+ supply_register (regcache, r, (char *) &l);
+ }
+ else if (r == FOP_REGNUM)
+ {
+ 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,
+ win32_thread_info *th, int r)
+{
+ char *context_offset = (char *) &th->context + mappings[r];
+ 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);
+ const char **expedite_regs = amd64_expedite_regs;
+#else
+ tdesc = i386_create_target_description (X86_XSTATE_SSE_MASK, false, false);
+ const char **expedite_regs = i386_expedite_regs;
+#endif
+
+ init_target_desc (tdesc, expedite_regs);
+
+ win32_tdesc = tdesc;
+}
+
+struct win32_target_ops the_low_target = {
+ i386_arch_setup,
+ sizeof (mappings) / sizeof (mappings[0]),
+ 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,
+ i386_supports_z_point_type,
+ i386_insert_point,
+ i386_remove_point,
+ x86_stopped_by_watchpoint,
+ x86_stopped_data_address
+};
generated by cgit v1.1 at 2024-11-23 22:11:59 +0000