-/* Copyright (C) 2009-2012 Free Software Foundation, Inc.
+/* Copyright (C) 2009-2020 Free Software Foundation, Inc.
This file is part of GDB.
#include "defs.h"
#include "osabi.h"
#include "amd64-tdep.h"
-#include "solib.h"
-#include "solib-target.h"
+#include "gdbsupport/x86-xstate.h"
#include "gdbtypes.h"
#include "gdbcore.h"
#include "regcache.h"
+#include "windows-tdep.h"
+#include "frame.h"
+#include "objfiles.h"
+#include "frame-unwind.h"
+#include "coff/internal.h"
+#include "coff/i386.h"
+#include "coff/pe.h"
+#include "libcoff.h"
+#include "value.h"
+#include <algorithm>
/* The registers used to pass integer arguments during a function call. */
static int amd64_windows_dummy_call_integer_regs[] =
{
AMD64_RCX_REGNUM, /* %rcx */
AMD64_RDX_REGNUM, /* %rdx */
- 8, /* %r8 */
- 9 /* %r9 */
+ AMD64_R8_REGNUM, /* %r8 */
+ AMD64_R9_REGNUM /* %r9 */
};
-/* Implement the "classify" method in the gdbarch_tdep structure
- for amd64-windows. */
+/* Return nonzero if an argument of type TYPE should be passed
+ via one of the integer registers. */
-static void
-amd64_windows_classify (struct type *type, enum amd64_reg_class class[2])
+static int
+amd64_windows_passed_by_integer_register (struct type *type)
{
switch (TYPE_CODE (type))
{
- case TYPE_CODE_ARRAY:
- /* Arrays are always passed by memory. */
- class[0] = class[1] = AMD64_MEMORY;
- break;
-
+ case TYPE_CODE_INT:
+ case TYPE_CODE_ENUM:
+ case TYPE_CODE_BOOL:
+ case TYPE_CODE_RANGE:
+ case TYPE_CODE_CHAR:
+ case TYPE_CODE_PTR:
+ case TYPE_CODE_REF:
+ case TYPE_CODE_RVALUE_REF:
case TYPE_CODE_STRUCT:
case TYPE_CODE_UNION:
- /* Struct/Union types whose size is 1, 2, 4, or 8 bytes
- are passed as if they were integers of the same size.
- Types of different sizes are passed by memory. */
- if (TYPE_LENGTH (type) == 1
- || TYPE_LENGTH (type) == 2
- || TYPE_LENGTH (type) == 4
- || TYPE_LENGTH (type) == 8)
- {
- class[0] = AMD64_INTEGER;
- class[1] = AMD64_NO_CLASS;
- }
- else
- class[0] = class[1] = AMD64_MEMORY;
- break;
+ return (TYPE_LENGTH (type) == 1
+ || TYPE_LENGTH (type) == 2
+ || TYPE_LENGTH (type) == 4
+ || TYPE_LENGTH (type) == 8);
default:
- /* For all the other types, the conventions are the same as
- with the System V ABI. */
- amd64_classify (type, class);
+ return 0;
}
}
+/* Return nonzero if an argument of type TYPE should be passed
+ via one of the XMM registers. */
+
+static int
+amd64_windows_passed_by_xmm_register (struct type *type)
+{
+ return ((TYPE_CODE (type) == TYPE_CODE_FLT
+ || TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
+ && (TYPE_LENGTH (type) == 4 || TYPE_LENGTH (type) == 8));
+}
+
+/* Return non-zero iff an argument of the given TYPE should be passed
+ by pointer. */
+
+static int
+amd64_windows_passed_by_pointer (struct type *type)
+{
+ if (amd64_windows_passed_by_integer_register (type))
+ return 0;
+
+ if (amd64_windows_passed_by_xmm_register (type))
+ return 0;
+
+ return 1;
+}
+
+/* For each argument that should be passed by pointer, reserve some
+ stack space, store a copy of the argument on the stack, and replace
+ the argument by its address. Return the new Stack Pointer value.
+
+ NARGS is the number of arguments. ARGS is the array containing
+ the value of each argument. SP is value of the Stack Pointer. */
+
+static CORE_ADDR
+amd64_windows_adjust_args_passed_by_pointer (struct value **args,
+ int nargs, CORE_ADDR sp)
+{
+ int i;
+
+ for (i = 0; i < nargs; i++)
+ if (amd64_windows_passed_by_pointer (value_type (args[i])))
+ {
+ struct type *type = value_type (args[i]);
+ const gdb_byte *valbuf = value_contents (args[i]);
+ const int len = TYPE_LENGTH (type);
+
+ /* Store a copy of that argument on the stack, aligned to
+ a 16 bytes boundary, and then use the copy's address as
+ the argument. */
+
+ sp -= len;
+ sp &= ~0xf;
+ write_memory (sp, valbuf, len);
+
+ args[i]
+ = value_addr (value_from_contents_and_address (type, valbuf, sp));
+ }
+
+ return sp;
+}
+
+/* Store the value of ARG in register REGNO (right-justified).
+ REGCACHE is the register cache. */
+
+static void
+amd64_windows_store_arg_in_reg (struct regcache *regcache,
+ struct value *arg, int regno)
+{
+ struct type *type = value_type (arg);
+ const gdb_byte *valbuf = value_contents (arg);
+ gdb_byte buf[8];
+
+ gdb_assert (TYPE_LENGTH (type) <= 8);
+ memset (buf, 0, sizeof buf);
+ memcpy (buf, valbuf, std::min (TYPE_LENGTH (type), (ULONGEST) 8));
+ regcache->cooked_write (regno, buf);
+}
+
+/* Push the arguments for an inferior function call, and return
+ the updated value of the SP (Stack Pointer).
+
+ All arguments are identical to the arguments used in
+ amd64_windows_push_dummy_call. */
+
+static CORE_ADDR
+amd64_windows_push_arguments (struct regcache *regcache, int nargs,
+ struct value **args, CORE_ADDR sp,
+ function_call_return_method return_method)
+{
+ int reg_idx = 0;
+ int i;
+ struct value **stack_args = XALLOCAVEC (struct value *, nargs);
+ int num_stack_args = 0;
+ int num_elements = 0;
+ int element = 0;
+
+ /* First, handle the arguments passed by pointer.
+
+ These arguments are replaced by pointers to a copy we are making
+ in inferior memory. So use a copy of the ARGS table, to avoid
+ modifying the original one. */
+ {
+ struct value **args1 = XALLOCAVEC (struct value *, nargs);
+
+ memcpy (args1, args, nargs * sizeof (struct value *));
+ sp = amd64_windows_adjust_args_passed_by_pointer (args1, nargs, sp);
+ args = args1;
+ }
+
+ /* Reserve a register for the "hidden" argument. */
+ if (return_method == return_method_struct)
+ reg_idx++;
+
+ for (i = 0; i < nargs; i++)
+ {
+ struct type *type = value_type (args[i]);
+ int len = TYPE_LENGTH (type);
+ int on_stack_p = 1;
+
+ if (reg_idx < ARRAY_SIZE (amd64_windows_dummy_call_integer_regs))
+ {
+ if (amd64_windows_passed_by_integer_register (type))
+ {
+ amd64_windows_store_arg_in_reg
+ (regcache, args[i],
+ amd64_windows_dummy_call_integer_regs[reg_idx]);
+ on_stack_p = 0;
+ reg_idx++;
+ }
+ else if (amd64_windows_passed_by_xmm_register (type))
+ {
+ amd64_windows_store_arg_in_reg
+ (regcache, args[i], AMD64_XMM0_REGNUM + reg_idx);
+ /* In case of varargs, these parameters must also be
+ passed via the integer registers. */
+ amd64_windows_store_arg_in_reg
+ (regcache, args[i],
+ amd64_windows_dummy_call_integer_regs[reg_idx]);
+ on_stack_p = 0;
+ reg_idx++;
+ }
+ }
+
+ if (on_stack_p)
+ {
+ num_elements += ((len + 7) / 8);
+ stack_args[num_stack_args++] = args[i];
+ }
+ }
+
+ /* Allocate space for the arguments on the stack, keeping it
+ aligned on a 16 byte boundary. */
+ sp -= num_elements * 8;
+ sp &= ~0xf;
+
+ /* Write out the arguments to the stack. */
+ for (i = 0; i < num_stack_args; i++)
+ {
+ struct type *type = value_type (stack_args[i]);
+ const gdb_byte *valbuf = value_contents (stack_args[i]);
+
+ write_memory (sp + element * 8, valbuf, TYPE_LENGTH (type));
+ element += ((TYPE_LENGTH (type) + 7) / 8);
+ }
+
+ return sp;
+}
+
+/* Implement the "push_dummy_call" gdbarch method. */
+
+static CORE_ADDR
+amd64_windows_push_dummy_call
+ (struct gdbarch *gdbarch, struct value *function,
+ struct regcache *regcache, CORE_ADDR bp_addr,
+ int nargs, struct value **args, CORE_ADDR sp,
+ function_call_return_method return_method, CORE_ADDR struct_addr)
+{
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ gdb_byte buf[8];
+
+ /* Pass arguments. */
+ sp = amd64_windows_push_arguments (regcache, nargs, args, sp,
+ return_method);
+
+ /* Pass "hidden" argument". */
+ if (return_method == return_method_struct)
+ {
+ /* The "hidden" argument is passed throught the first argument
+ register. */
+ const int arg_regnum = amd64_windows_dummy_call_integer_regs[0];
+
+ store_unsigned_integer (buf, 8, byte_order, struct_addr);
+ regcache->cooked_write (arg_regnum, buf);
+ }
+
+ /* Reserve some memory on the stack for the integer-parameter
+ registers, as required by the ABI. */
+ sp -= ARRAY_SIZE (amd64_windows_dummy_call_integer_regs) * 8;
+
+ /* Store return address. */
+ sp -= 8;
+ store_unsigned_integer (buf, 8, byte_order, bp_addr);
+ write_memory (sp, buf, 8);
+
+ /* Update the stack pointer... */
+ store_unsigned_integer (buf, 8, byte_order, sp);
+ regcache->cooked_write (AMD64_RSP_REGNUM, buf);
+
+ /* ...and fake a frame pointer. */
+ regcache->cooked_write (AMD64_RBP_REGNUM, buf);
+
+ return sp + 16;
+}
+
/* Implement the "return_value" gdbarch method for amd64-windows. */
static enum return_value_convention
-amd64_windows_return_value (struct gdbarch *gdbarch, struct type *func_type,
+amd64_windows_return_value (struct gdbarch *gdbarch, struct value *function,
struct type *type, struct regcache *regcache,
gdb_byte *readbuf, const gdb_byte *writebuf)
{
{
/* Extract the return value from the register where it was stored. */
if (readbuf)
- regcache_raw_read_part (regcache, regnum, 0, len, readbuf);
+ regcache->raw_read_part (regnum, 0, len, readbuf);
if (writebuf)
- regcache_raw_write_part (regcache, regnum, 0, len, writebuf);
+ regcache->raw_write_part (regnum, 0, len, writebuf);
return RETURN_VALUE_REGISTER_CONVENTION;
}
}
if (target_read_memory (pc + 1, buf, sizeof buf) == 0)
{
- struct minimal_symbol *s;
+ struct bound_minimal_symbol s;
CORE_ADDR call_dest;
call_dest = pc + 5 + extract_signed_integer (buf, 4, byte_order);
s = lookup_minimal_symbol_by_pc (call_dest);
- if (s != NULL
- && SYMBOL_LINKAGE_NAME (s) != NULL
- && strcmp (SYMBOL_LINKAGE_NAME (s), "__main") == 0)
+ if (s.minsym != NULL
+ && s.minsym->linkage_name () != NULL
+ && strcmp (s.minsym->linkage_name (), "__main") == 0)
pc += 5;
}
}
return pc;
}
+struct amd64_windows_frame_cache
+{
+ /* ImageBase for the module. */
+ CORE_ADDR image_base;
+
+ /* Function start and end rva. */
+ CORE_ADDR start_rva;
+ CORE_ADDR end_rva;
+
+ /* Next instruction to be executed. */
+ CORE_ADDR pc;
+
+ /* Current sp. */
+ CORE_ADDR sp;
+
+ /* Address of saved integer and xmm registers. */
+ CORE_ADDR prev_reg_addr[16];
+ CORE_ADDR prev_xmm_addr[16];
+
+ /* These two next fields are set only for machine info frames. */
+
+ /* Likewise for RIP. */
+ CORE_ADDR prev_rip_addr;
+
+ /* Likewise for RSP. */
+ CORE_ADDR prev_rsp_addr;
+
+ /* Address of the previous frame. */
+ CORE_ADDR prev_sp;
+};
+
+/* Convert a Windows register number to gdb. */
+static const enum amd64_regnum amd64_windows_w2gdb_regnum[] =
+{
+ AMD64_RAX_REGNUM,
+ AMD64_RCX_REGNUM,
+ AMD64_RDX_REGNUM,
+ AMD64_RBX_REGNUM,
+ AMD64_RSP_REGNUM,
+ AMD64_RBP_REGNUM,
+ AMD64_RSI_REGNUM,
+ AMD64_RDI_REGNUM,
+ AMD64_R8_REGNUM,
+ AMD64_R9_REGNUM,
+ AMD64_R10_REGNUM,
+ AMD64_R11_REGNUM,
+ AMD64_R12_REGNUM,
+ AMD64_R13_REGNUM,
+ AMD64_R14_REGNUM,
+ AMD64_R15_REGNUM
+};
+
+/* Return TRUE iff PC is the range of the function corresponding to
+ CACHE. */
+
+static int
+pc_in_range (CORE_ADDR pc, const struct amd64_windows_frame_cache *cache)
+{
+ return (pc >= cache->image_base + cache->start_rva
+ && pc < cache->image_base + cache->end_rva);
+}
+
+/* Try to recognize and decode an epilogue sequence.
+
+ Return -1 if we fail to read the instructions for any reason.
+ Return 1 if an epilogue sequence was recognized, 0 otherwise. */
+
+static int
+amd64_windows_frame_decode_epilogue (struct frame_info *this_frame,
+ struct amd64_windows_frame_cache *cache)
+{
+ /* According to MSDN an epilogue "must consist of either an add RSP,constant
+ or lea RSP,constant[FPReg], followed by a series of zero or more 8-byte
+ register pops and a return or a jmp".
+
+ Furthermore, according to RtlVirtualUnwind, the complete list of
+ epilog marker is:
+ - ret [c3]
+ - ret n [c2 imm16]
+ - rep ret [f3 c3]
+ - jmp imm8 | imm32 [eb rel8] or [e9 rel32]
+ - jmp qword ptr imm32 - not handled
+ - rex.w jmp reg [4X ff eY]
+ */
+
+ CORE_ADDR pc = cache->pc;
+ CORE_ADDR cur_sp = cache->sp;
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ gdb_byte op;
+ gdb_byte rex;
+
+ /* We don't care about the instruction deallocating the frame:
+ if it hasn't been executed, the pc is still in the body,
+ if it has been executed, the following epilog decoding will work. */
+
+ /* First decode:
+ - pop reg [41 58-5f] or [58-5f]. */
+
+ while (1)
+ {
+ /* Read opcode. */
+ if (target_read_memory (pc, &op, 1) != 0)
+ return -1;
+
+ if (op >= 0x40 && op <= 0x4f)
+ {
+ /* REX prefix. */
+ rex = op;
+
+ /* Read opcode. */
+ if (target_read_memory (pc + 1, &op, 1) != 0)
+ return -1;
+ }
+ else
+ rex = 0;
+
+ if (op >= 0x58 && op <= 0x5f)
+ {
+ /* pop reg */
+ gdb_byte reg = (op & 0x0f) | ((rex & 1) << 3);
+
+ cache->prev_reg_addr[amd64_windows_w2gdb_regnum[reg]] = cur_sp;
+ cur_sp += 8;
+ pc += rex ? 2 : 1;
+ }
+ else
+ break;
+
+ /* Allow the user to break this loop. This shouldn't happen as the
+ number of consecutive pop should be small. */
+ QUIT;
+ }
+
+ /* Then decode the marker. */
+
+ /* Read opcode. */
+ if (target_read_memory (pc, &op, 1) != 0)
+ return -1;
+
+ switch (op)
+ {
+ case 0xc3:
+ /* Ret. */
+ cache->prev_rip_addr = cur_sp;
+ cache->prev_sp = cur_sp + 8;
+ return 1;
+
+ case 0xeb:
+ {
+ /* jmp rel8 */
+ gdb_byte rel8;
+ CORE_ADDR npc;
+
+ if (target_read_memory (pc + 1, &rel8, 1) != 0)
+ return -1;
+ npc = pc + 2 + (signed char) rel8;
+
+ /* If the jump is within the function, then this is not a marker,
+ otherwise this is a tail-call. */
+ return !pc_in_range (npc, cache);
+ }
+
+ case 0xec:
+ {
+ /* jmp rel32 */
+ gdb_byte rel32[4];
+ CORE_ADDR npc;
+
+ if (target_read_memory (pc + 1, rel32, 4) != 0)
+ return -1;
+ npc = pc + 5 + extract_signed_integer (rel32, 4, byte_order);
+
+ /* If the jump is within the function, then this is not a marker,
+ otherwise this is a tail-call. */
+ return !pc_in_range (npc, cache);
+ }
+
+ case 0xc2:
+ {
+ /* ret n */
+ gdb_byte imm16[2];
+
+ if (target_read_memory (pc + 1, imm16, 2) != 0)
+ return -1;
+ cache->prev_rip_addr = cur_sp;
+ cache->prev_sp = cur_sp
+ + extract_unsigned_integer (imm16, 4, byte_order);
+ return 1;
+ }
+
+ case 0xf3:
+ {
+ /* rep; ret */
+ gdb_byte op1;
+
+ if (target_read_memory (pc + 2, &op1, 1) != 0)
+ return -1;
+ if (op1 != 0xc3)
+ return 0;
+
+ cache->prev_rip_addr = cur_sp;
+ cache->prev_sp = cur_sp + 8;
+ return 1;
+ }
+
+ case 0x40:
+ case 0x41:
+ case 0x42:
+ case 0x43:
+ case 0x44:
+ case 0x45:
+ case 0x46:
+ case 0x47:
+ case 0x48:
+ case 0x49:
+ case 0x4a:
+ case 0x4b:
+ case 0x4c:
+ case 0x4d:
+ case 0x4e:
+ case 0x4f:
+ /* Got a REX prefix, read next byte. */
+ rex = op;
+ if (target_read_memory (pc + 1, &op, 1) != 0)
+ return -1;
+
+ if (op == 0xff)
+ {
+ /* rex jmp reg */
+ gdb_byte op1;
+
+ if (target_read_memory (pc + 2, &op1, 1) != 0)
+ return -1;
+ return (op1 & 0xf8) == 0xe0;
+ }
+ else
+ return 0;
+
+ default:
+ /* Not REX, so unknown. */
+ return 0;
+ }
+}
+
+/* Decode and execute unwind insns at UNWIND_INFO. */
+
+static void
+amd64_windows_frame_decode_insns (struct frame_info *this_frame,
+ struct amd64_windows_frame_cache *cache,
+ CORE_ADDR unwind_info)
+{
+ CORE_ADDR save_addr = 0;
+ CORE_ADDR cur_sp = cache->sp;
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ int first = 1;
+
+ /* There are at least 3 possibilities to share an unwind info entry:
+ 1. Two different runtime_function entries (in .pdata) can point to the
+ same unwind info entry. There is no such indication while unwinding,
+ so we don't really care about that case. We suppose this scheme is
+ used to save memory when the unwind entries are exactly the same.
+ 2. Chained unwind_info entries, with no unwind codes (no prologue).
+ There is a major difference with the previous case: the pc range for
+ the function is different (in case 1, the pc range comes from the
+ runtime_function entry; in case 2, the pc range for the chained entry
+ comes from the first unwind entry). Case 1 cannot be used instead as
+ the pc is not in the prologue. This case is officially documented.
+ (There might be unwind code in the first unwind entry to handle
+ additional unwinding). GCC (at least until gcc 5.0) doesn't chain
+ entries.
+ 3. Undocumented unwind info redirection. Hard to know the exact purpose,
+ so it is considered as a memory optimization of case 2.
+ */
+
+ if (unwind_info & 1)
+ {
+ /* Unofficially documented unwind info redirection, when UNWIND_INFO
+ address is odd (http://www.codemachine.com/article_x64deepdive.html).
+ */
+ struct external_pex64_runtime_function d;
+
+ if (target_read_memory (cache->image_base + (unwind_info & ~1),
+ (gdb_byte *) &d, sizeof (d)) != 0)
+ return;
+
+ cache->start_rva
+ = extract_unsigned_integer (d.rva_BeginAddress, 4, byte_order);
+ cache->end_rva
+ = extract_unsigned_integer (d.rva_EndAddress, 4, byte_order);
+ unwind_info
+ = extract_unsigned_integer (d.rva_UnwindData, 4, byte_order);
+ }
+
+ while (1)
+ {
+ struct external_pex64_unwind_info ex_ui;
+ /* There are at most 256 16-bit unwind insns. */
+ gdb_byte insns[2 * 256];
+ gdb_byte *p;
+ gdb_byte *end_insns;
+ unsigned char codes_count;
+ unsigned char frame_reg;
+ CORE_ADDR start;
+
+ /* Read and decode header. */
+ if (target_read_memory (cache->image_base + unwind_info,
+ (gdb_byte *) &ex_ui, sizeof (ex_ui)) != 0)
+ return;
+
+ if (frame_debug)
+ fprintf_unfiltered
+ (gdb_stdlog,
+ "amd64_windows_frame_decodes_insn: "
+ "%s: ver: %02x, plgsz: %02x, cnt: %02x, frame: %02x\n",
+ paddress (gdbarch, unwind_info),
+ ex_ui.Version_Flags, ex_ui.SizeOfPrologue,
+ ex_ui.CountOfCodes, ex_ui.FrameRegisterOffset);
+
+ /* Check version. */
+ if (PEX64_UWI_VERSION (ex_ui.Version_Flags) != 1
+ && PEX64_UWI_VERSION (ex_ui.Version_Flags) != 2)
+ return;
+
+ start = cache->image_base + cache->start_rva;
+ if (first
+ && !(cache->pc >= start && cache->pc < start + ex_ui.SizeOfPrologue))
+ {
+ /* We want to detect if the PC points to an epilogue. This needs
+ to be checked only once, and an epilogue can be anywhere but in
+ the prologue. If so, the epilogue detection+decoding function is
+ sufficient. Otherwise, the unwinder will consider that the PC
+ is in the body of the function and will need to decode unwind
+ info. */
+ if (amd64_windows_frame_decode_epilogue (this_frame, cache) == 1)
+ return;
+
+ /* Not in an epilog. Clear possible side effects. */
+ memset (cache->prev_reg_addr, 0, sizeof (cache->prev_reg_addr));
+ }
+
+ codes_count = ex_ui.CountOfCodes;
+ frame_reg = PEX64_UWI_FRAMEREG (ex_ui.FrameRegisterOffset);
+
+ if (frame_reg != 0)
+ {
+ /* According to msdn:
+ If an FP reg is used, then any unwind code taking an offset must
+ only be used after the FP reg is established in the prolog. */
+ gdb_byte buf[8];
+ int frreg = amd64_windows_w2gdb_regnum[frame_reg];
+
+ get_frame_register (this_frame, frreg, buf);
+ save_addr = extract_unsigned_integer (buf, 8, byte_order);
+
+ if (frame_debug)
+ fprintf_unfiltered (gdb_stdlog, " frame_reg=%s, val=%s\n",
+ gdbarch_register_name (gdbarch, frreg),
+ paddress (gdbarch, save_addr));
+ }
+
+ /* Read opcodes. */
+ if (codes_count != 0
+ && target_read_memory (cache->image_base + unwind_info
+ + sizeof (ex_ui),
+ insns, codes_count * 2) != 0)
+ return;
+
+ end_insns = &insns[codes_count * 2];
+ p = insns;
+
+ /* Skip opcodes 6 of version 2. This opcode is not documented. */
+ if (PEX64_UWI_VERSION (ex_ui.Version_Flags) == 2)
+ {
+ for (; p < end_insns; p += 2)
+ if (PEX64_UNWCODE_CODE (p[1]) != 6)
+ break;
+ }
+
+ for (; p < end_insns; p += 2)
+ {
+ int reg;
+
+ /* Virtually execute the operation if the pc is after the
+ corresponding instruction (that does matter in case of break
+ within the prologue). Note that for chained info (!first), the
+ prologue has been fully executed. */
+ if (cache->pc >= start + p[0] || cache->pc < start)
+ {
+ if (frame_debug)
+ fprintf_unfiltered
+ (gdb_stdlog, " op #%u: off=0x%02x, insn=0x%02x\n",
+ (unsigned) (p - insns), p[0], p[1]);
+
+ /* If there is no frame registers defined, the current value of
+ rsp is used instead. */
+ if (frame_reg == 0)
+ save_addr = cur_sp;
+
+ reg = -1;
+
+ switch (PEX64_UNWCODE_CODE (p[1]))
+ {
+ case UWOP_PUSH_NONVOL:
+ /* Push pre-decrements RSP. */
+ reg = amd64_windows_w2gdb_regnum[PEX64_UNWCODE_INFO (p[1])];
+ cache->prev_reg_addr[reg] = cur_sp;
+ cur_sp += 8;
+ break;
+ case UWOP_ALLOC_LARGE:
+ if (PEX64_UNWCODE_INFO (p[1]) == 0)
+ cur_sp +=
+ 8 * extract_unsigned_integer (p + 2, 2, byte_order);
+ else if (PEX64_UNWCODE_INFO (p[1]) == 1)
+ cur_sp += extract_unsigned_integer (p + 2, 4, byte_order);
+ else
+ return;
+ break;
+ case UWOP_ALLOC_SMALL:
+ cur_sp += 8 + 8 * PEX64_UNWCODE_INFO (p[1]);
+ break;
+ case UWOP_SET_FPREG:
+ cur_sp = save_addr
+ - PEX64_UWI_FRAMEOFF (ex_ui.FrameRegisterOffset) * 16;
+ break;
+ case UWOP_SAVE_NONVOL:
+ reg = amd64_windows_w2gdb_regnum[PEX64_UNWCODE_INFO (p[1])];
+ cache->prev_reg_addr[reg] = save_addr
+ + 8 * extract_unsigned_integer (p + 2, 2, byte_order);
+ break;
+ case UWOP_SAVE_NONVOL_FAR:
+ reg = amd64_windows_w2gdb_regnum[PEX64_UNWCODE_INFO (p[1])];
+ cache->prev_reg_addr[reg] = save_addr
+ + 8 * extract_unsigned_integer (p + 2, 4, byte_order);
+ break;
+ case UWOP_SAVE_XMM128:
+ cache->prev_xmm_addr[PEX64_UNWCODE_INFO (p[1])] =
+ save_addr
+ - 16 * extract_unsigned_integer (p + 2, 2, byte_order);
+ break;
+ case UWOP_SAVE_XMM128_FAR:
+ cache->prev_xmm_addr[PEX64_UNWCODE_INFO (p[1])] =
+ save_addr
+ - 16 * extract_unsigned_integer (p + 2, 4, byte_order);
+ break;
+ case UWOP_PUSH_MACHFRAME:
+ if (PEX64_UNWCODE_INFO (p[1]) == 0)
+ {
+ cache->prev_rip_addr = cur_sp + 0;
+ cache->prev_rsp_addr = cur_sp + 24;
+ cur_sp += 40;
+ }
+ else if (PEX64_UNWCODE_INFO (p[1]) == 1)
+ {
+ cache->prev_rip_addr = cur_sp + 8;
+ cache->prev_rsp_addr = cur_sp + 32;
+ cur_sp += 48;
+ }
+ else
+ return;
+ break;
+ default:
+ return;
+ }
+
+ /* Display address where the register was saved. */
+ if (frame_debug && reg >= 0)
+ fprintf_unfiltered
+ (gdb_stdlog, " [reg %s at %s]\n",
+ gdbarch_register_name (gdbarch, reg),
+ paddress (gdbarch, cache->prev_reg_addr[reg]));
+ }
+
+ /* Adjust with the length of the opcode. */
+ switch (PEX64_UNWCODE_CODE (p[1]))
+ {
+ case UWOP_PUSH_NONVOL:
+ case UWOP_ALLOC_SMALL:
+ case UWOP_SET_FPREG:
+ case UWOP_PUSH_MACHFRAME:
+ break;
+ case UWOP_ALLOC_LARGE:
+ if (PEX64_UNWCODE_INFO (p[1]) == 0)
+ p += 2;
+ else if (PEX64_UNWCODE_INFO (p[1]) == 1)
+ p += 4;
+ else
+ return;
+ break;
+ case UWOP_SAVE_NONVOL:
+ case UWOP_SAVE_XMM128:
+ p += 2;
+ break;
+ case UWOP_SAVE_NONVOL_FAR:
+ case UWOP_SAVE_XMM128_FAR:
+ p += 4;
+ break;
+ default:
+ return;
+ }
+ }
+ if (PEX64_UWI_FLAGS (ex_ui.Version_Flags) != UNW_FLAG_CHAININFO)
+ {
+ /* End of unwind info. */
+ break;
+ }
+ else
+ {
+ /* Read the chained unwind info. */
+ struct external_pex64_runtime_function d;
+ CORE_ADDR chain_vma;
+
+ /* Not anymore the first entry. */
+ first = 0;
+
+ /* Stay aligned on word boundary. */
+ chain_vma = cache->image_base + unwind_info
+ + sizeof (ex_ui) + ((codes_count + 1) & ~1) * 2;
+
+ if (target_read_memory (chain_vma, (gdb_byte *) &d, sizeof (d)) != 0)
+ return;
+
+ /* Decode begin/end. This may be different from .pdata index, as
+ an unwind info may be shared by several functions (in particular
+ if many functions have the same prolog and handler. */
+ cache->start_rva =
+ extract_unsigned_integer (d.rva_BeginAddress, 4, byte_order);
+ cache->end_rva =
+ extract_unsigned_integer (d.rva_EndAddress, 4, byte_order);
+ unwind_info =
+ extract_unsigned_integer (d.rva_UnwindData, 4, byte_order);
+
+ if (frame_debug)
+ fprintf_unfiltered
+ (gdb_stdlog,
+ "amd64_windows_frame_decodes_insn (next in chain):"
+ " unwind_data=%s, start_rva=%s, end_rva=%s\n",
+ paddress (gdbarch, unwind_info),
+ paddress (gdbarch, cache->start_rva),
+ paddress (gdbarch, cache->end_rva));
+ }
+
+ /* Allow the user to break this loop. */
+ QUIT;
+ }
+ /* PC is saved by the call. */
+ if (cache->prev_rip_addr == 0)
+ cache->prev_rip_addr = cur_sp;
+ cache->prev_sp = cur_sp + 8;
+
+ if (frame_debug)
+ fprintf_unfiltered (gdb_stdlog, " prev_sp: %s, prev_pc @%s\n",
+ paddress (gdbarch, cache->prev_sp),
+ paddress (gdbarch, cache->prev_rip_addr));
+}
+
+/* Find SEH unwind info for PC, returning 0 on success.
+
+ UNWIND_INFO is set to the rva of unwind info address, IMAGE_BASE
+ to the base address of the corresponding image, and START_RVA
+ to the rva of the function containing PC. */
+
+static int
+amd64_windows_find_unwind_info (struct gdbarch *gdbarch, CORE_ADDR pc,
+ CORE_ADDR *unwind_info,
+ CORE_ADDR *image_base,
+ CORE_ADDR *start_rva,
+ CORE_ADDR *end_rva)
+{
+ struct obj_section *sec;
+ pe_data_type *pe;
+ IMAGE_DATA_DIRECTORY *dir;
+ struct objfile *objfile;
+ unsigned long lo, hi;
+ CORE_ADDR base;
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+
+ /* Get the corresponding exception directory. */
+ sec = find_pc_section (pc);
+ if (sec == NULL)
+ return -1;
+ objfile = sec->objfile;
+ pe = pe_data (sec->objfile->obfd);
+ dir = &pe->pe_opthdr.DataDirectory[PE_EXCEPTION_TABLE];
+
+ base = (pe->pe_opthdr.ImageBase
+ + objfile->section_offsets[SECT_OFF_TEXT (objfile)]);
+ *image_base = base;
+
+ /* Find the entry.
+
+ Note: This does not handle dynamically added entries (for JIT
+ engines). For this, we would need to ask the kernel directly,
+ which means getting some info from the native layer. For the
+ rest of the code, however, it's probably faster to search
+ the entry ourselves. */
+ lo = 0;
+ hi = dir->Size / sizeof (struct external_pex64_runtime_function);
+ *unwind_info = 0;
+ while (lo <= hi)
+ {
+ unsigned long mid = lo + (hi - lo) / 2;
+ struct external_pex64_runtime_function d;
+ CORE_ADDR sa, ea;
+
+ if (target_read_memory (base + dir->VirtualAddress + mid * sizeof (d),
+ (gdb_byte *) &d, sizeof (d)) != 0)
+ return -1;
+
+ sa = extract_unsigned_integer (d.rva_BeginAddress, 4, byte_order);
+ ea = extract_unsigned_integer (d.rva_EndAddress, 4, byte_order);
+ if (pc < base + sa)
+ hi = mid - 1;
+ else if (pc >= base + ea)
+ lo = mid + 1;
+ else if (pc >= base + sa && pc < base + ea)
+ {
+ /* Got it. */
+ *start_rva = sa;
+ *end_rva = ea;
+ *unwind_info =
+ extract_unsigned_integer (d.rva_UnwindData, 4, byte_order);
+ break;
+ }
+ else
+ break;
+ }
+
+ if (frame_debug)
+ fprintf_unfiltered
+ (gdb_stdlog,
+ "amd64_windows_find_unwind_data: image_base=%s, unwind_data=%s\n",
+ paddress (gdbarch, base), paddress (gdbarch, *unwind_info));
+
+ return 0;
+}
+
+/* Fill THIS_CACHE using the native amd64-windows unwinding data
+ for THIS_FRAME. */
+
+static struct amd64_windows_frame_cache *
+amd64_windows_frame_cache (struct frame_info *this_frame, void **this_cache)
+{
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ struct amd64_windows_frame_cache *cache;
+ gdb_byte buf[8];
+ CORE_ADDR pc;
+ CORE_ADDR unwind_info = 0;
+
+ if (*this_cache)
+ return (struct amd64_windows_frame_cache *) *this_cache;
+
+ cache = FRAME_OBSTACK_ZALLOC (struct amd64_windows_frame_cache);
+ *this_cache = cache;
+
+ /* Get current PC and SP. */
+ pc = get_frame_pc (this_frame);
+ get_frame_register (this_frame, AMD64_RSP_REGNUM, buf);
+ cache->sp = extract_unsigned_integer (buf, 8, byte_order);
+ cache->pc = pc;
+
+ if (amd64_windows_find_unwind_info (gdbarch, pc, &unwind_info,
+ &cache->image_base,
+ &cache->start_rva,
+ &cache->end_rva))
+ return cache;
+
+ if (unwind_info == 0)
+ {
+ /* Assume a leaf function. */
+ cache->prev_sp = cache->sp + 8;
+ cache->prev_rip_addr = cache->sp;
+ }
+ else
+ {
+ /* Decode unwind insns to compute saved addresses. */
+ amd64_windows_frame_decode_insns (this_frame, cache, unwind_info);
+ }
+ return cache;
+}
+
+/* Implement the "prev_register" method of struct frame_unwind
+ using the standard Windows x64 SEH info. */
+
+static struct value *
+amd64_windows_frame_prev_register (struct frame_info *this_frame,
+ void **this_cache, int regnum)
+{
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ struct amd64_windows_frame_cache *cache =
+ amd64_windows_frame_cache (this_frame, this_cache);
+ CORE_ADDR prev;
+
+ if (frame_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ "amd64_windows_frame_prev_register %s for sp=%s\n",
+ gdbarch_register_name (gdbarch, regnum),
+ paddress (gdbarch, cache->prev_sp));
+
+ if (regnum >= AMD64_XMM0_REGNUM && regnum <= AMD64_XMM0_REGNUM + 15)
+ prev = cache->prev_xmm_addr[regnum - AMD64_XMM0_REGNUM];
+ else if (regnum == AMD64_RSP_REGNUM)
+ {
+ prev = cache->prev_rsp_addr;
+ if (prev == 0)
+ return frame_unwind_got_constant (this_frame, regnum, cache->prev_sp);
+ }
+ else if (regnum >= AMD64_RAX_REGNUM && regnum <= AMD64_R15_REGNUM)
+ prev = cache->prev_reg_addr[regnum - AMD64_RAX_REGNUM];
+ else if (regnum == AMD64_RIP_REGNUM)
+ prev = cache->prev_rip_addr;
+ else
+ prev = 0;
+
+ if (prev && frame_debug)
+ fprintf_unfiltered (gdb_stdlog, " -> at %s\n", paddress (gdbarch, prev));
+
+ if (prev)
+ {
+ /* Register was saved. */
+ return frame_unwind_got_memory (this_frame, regnum, prev);
+ }
+ else
+ {
+ /* Register is either volatile or not modified. */
+ return frame_unwind_got_register (this_frame, regnum, regnum);
+ }
+}
+
+/* Implement the "this_id" method of struct frame_unwind using
+ the standard Windows x64 SEH info. */
+
+static void
+amd64_windows_frame_this_id (struct frame_info *this_frame, void **this_cache,
+ struct frame_id *this_id)
+{
+ struct amd64_windows_frame_cache *cache =
+ amd64_windows_frame_cache (this_frame, this_cache);
+
+ *this_id = frame_id_build (cache->prev_sp,
+ cache->image_base + cache->start_rva);
+}
+
+/* Windows x64 SEH unwinder. */
+
+static const struct frame_unwind amd64_windows_frame_unwind =
+{
+ NORMAL_FRAME,
+ default_frame_unwind_stop_reason,
+ &amd64_windows_frame_this_id,
+ &amd64_windows_frame_prev_register,
+ NULL,
+ default_frame_sniffer
+};
+
+/* Implement the "skip_prologue" gdbarch method. */
+
+static CORE_ADDR
+amd64_windows_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
+{
+ CORE_ADDR func_addr;
+ CORE_ADDR unwind_info = 0;
+ CORE_ADDR image_base, start_rva, end_rva;
+ struct external_pex64_unwind_info ex_ui;
+
+ /* Use prologue size from unwind info. */
+ if (amd64_windows_find_unwind_info (gdbarch, pc, &unwind_info,
+ &image_base, &start_rva, &end_rva) == 0)
+ {
+ if (unwind_info == 0)
+ {
+ /* Leaf function. */
+ return pc;
+ }
+ else if (target_read_memory (image_base + unwind_info,
+ (gdb_byte *) &ex_ui, sizeof (ex_ui)) == 0
+ && PEX64_UWI_VERSION (ex_ui.Version_Flags) == 1)
+ return std::max (pc, image_base + start_rva + ex_ui.SizeOfPrologue);
+ }
+
+ /* See if we can determine the end of the prologue via the symbol
+ table. If so, then return either the PC, or the PC after
+ the prologue, whichever is greater. */
+ if (find_pc_partial_function (pc, NULL, &func_addr, NULL))
+ {
+ CORE_ADDR post_prologue_pc
+ = skip_prologue_using_sal (gdbarch, func_addr);
+
+ if (post_prologue_pc != 0)
+ return std::max (pc, post_prologue_pc);
+ }
+
+ return pc;
+}
+
+/* Check Win64 DLL jmp trampolines and find jump destination. */
+
+static CORE_ADDR
+amd64_windows_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
+{
+ CORE_ADDR destination = 0;
+ struct gdbarch *gdbarch = get_frame_arch (frame);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+
+ /* Check for jmp *<offset>(%rip) (jump near, absolute indirect (/4)). */
+ if (pc && read_memory_unsigned_integer (pc, 2, byte_order) == 0x25ff)
+ {
+ /* Get opcode offset and see if we can find a reference in our data. */
+ ULONGEST offset
+ = read_memory_unsigned_integer (pc + 2, 4, byte_order);
+
+ /* Get address of function pointer at end of pc. */
+ CORE_ADDR indirect_addr = pc + offset + 6;
+
+ struct minimal_symbol *indsym
+ = (indirect_addr
+ ? lookup_minimal_symbol_by_pc (indirect_addr).minsym
+ : NULL);
+ const char *symname = indsym ? indsym->linkage_name () : NULL;
+
+ if (symname)
+ {
+ if (startswith (symname, "__imp_")
+ || startswith (symname, "_imp_"))
+ destination
+ = read_memory_unsigned_integer (indirect_addr, 8, byte_order);
+ }
+ }
+
+ return destination;
+}
+
+/* Implement the "auto_wide_charset" gdbarch method. */
+
+static const char *
+amd64_windows_auto_wide_charset (void)
+{
+ return "UTF-16";
+}
static void
amd64_windows_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ /* The dwarf2 unwinder (appended very early by i386_gdbarch_init) is
+ preferred over the SEH one. The reasons are:
+ - binaries without SEH but with dwarf2 debug info are correctly handled
+ (although they aren't ABI compliant, gcc before 4.7 didn't emit SEH
+ info).
+ - dwarf3 DW_OP_call_frame_cfa is correctly handled (it can only be
+ handled if the dwarf2 unwinder is used).
+
+ The call to amd64_init_abi appends default unwinders, that aren't
+ compatible with the SEH one.
+ */
+ frame_unwind_append_unwinder (gdbarch, &amd64_windows_frame_unwind);
- amd64_init_abi (info, gdbarch);
+ amd64_init_abi (info, gdbarch,
+ amd64_target_description (X86_XSTATE_SSE_MASK, false));
+
+ windows_init_abi (info, gdbarch);
/* On Windows, "long"s are only 32bit. */
set_gdbarch_long_bit (gdbarch, 32);
/* Function calls. */
- tdep->call_dummy_num_integer_regs =
- ARRAY_SIZE (amd64_windows_dummy_call_integer_regs);
- tdep->call_dummy_integer_regs = amd64_windows_dummy_call_integer_regs;
- tdep->classify = amd64_windows_classify;
- tdep->memory_args_by_pointer = 1;
- tdep->integer_param_regs_saved_in_caller_frame = 1;
+ set_gdbarch_push_dummy_call (gdbarch, amd64_windows_push_dummy_call);
set_gdbarch_return_value (gdbarch, amd64_windows_return_value);
set_gdbarch_skip_main_prologue (gdbarch, amd64_skip_main_prologue);
+ set_gdbarch_skip_trampoline_code (gdbarch,
+ amd64_windows_skip_trampoline_code);
- set_solib_ops (gdbarch, &solib_target_so_ops);
-}
+ set_gdbarch_skip_prologue (gdbarch, amd64_windows_skip_prologue);
-/* -Wmissing-prototypes */
-extern initialize_file_ftype _initialize_amd64_windows_tdep;
+ set_gdbarch_auto_wide_charset (gdbarch, amd64_windows_auto_wide_charset);
+}
void
_initialize_amd64_windows_tdep (void)
gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64, GDB_OSABI_CYGWIN,
amd64_windows_init_abi);
}
-
projects / deliverable / binutils-gdb.git / blobdiff