2013-09-02 Tristan Gingold <gingold@adacore.com>
* NEWS: Add entry mentioning support for native Windows x64 SEH data. * amd64-windows-tdep.c: #include "objfiles.h", "frame-unwind.h", "coff/internal.h", "coff/i386.h", "coff/pe.h" and "libcoff.h". (struct amd64_windows_frame_cache): New struct. (amd64_windows_w2gdb_regnum): New global. (pc_in_range, amd64_windows_frame_decode_epilogue) (amd64_windows_frame_decode_insns, amd64_windows_find_unwind_info) (amd64_windows_frame_cache, amd64_windows_frame_prev_register) (amd64_windows_frame_this_id): New functions. (amd64_windows_frame_unwind): New static global. (amd64_windows_skip_prologue): New function. (amd64_windows_init_abi): Call frame_unwind_prepend_unwinder with amd64_windows_frame_unwind. Call set_gdbarch_skip_prologue with amd64_windows_skip_prologue.
This commit is contained in:
parent
dd97e043eb
commit
9058cc3a1b
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@ -1,3 +1,22 @@
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2013-09-02 Tristan Gingold <gingold@adacore.com>
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* NEWS: Add entry mentioning support for native Windows x64
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SEH data.
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* amd64-windows-tdep.c: #include "objfiles.h", "frame-unwind.h",
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"coff/internal.h", "coff/i386.h", "coff/pe.h" and "libcoff.h".
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(struct amd64_windows_frame_cache): New struct.
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(amd64_windows_w2gdb_regnum): New global.
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(pc_in_range, amd64_windows_frame_decode_epilogue)
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(amd64_windows_frame_decode_insns, amd64_windows_find_unwind_info)
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(amd64_windows_frame_cache, amd64_windows_frame_prev_register)
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(amd64_windows_frame_this_id): New functions.
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(amd64_windows_frame_unwind): New static global.
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(amd64_windows_skip_prologue): New function.
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(amd64_windows_init_abi): Call frame_unwind_prepend_unwinder
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with amd64_windows_frame_unwind. Call set_gdbarch_skip_prologue
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with amd64_windows_skip_prologue.
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2013-08-30 Joel Brobecker <brobecker@adacore.com>
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GDB 7.6.1 released.
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2
gdb/NEWS
2
gdb/NEWS
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@ -142,6 +142,8 @@ qXfer:libraries-svr4:read's annex
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* New 'z' formatter for printing and examining memory, this displays the
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value as hexadecimal zero padded on the left to the size of the type.
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* GDB can now use Windows x64 unwinding data.
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*** Changes in GDB 7.6
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* Target record has been renamed to record-full.
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@ -25,6 +25,12 @@
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#include "regcache.h"
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#include "windows-tdep.h"
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#include "frame.h"
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#include "objfiles.h"
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#include "frame-unwind.h"
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#include "coff/internal.h"
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#include "coff/i386.h"
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#include "coff/pe.h"
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#include "libcoff.h"
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/* The registers used to pass integer arguments during a function call. */
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static int amd64_windows_dummy_call_integer_regs[] =
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@ -155,6 +161,752 @@ amd64_skip_main_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
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return pc;
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}
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struct amd64_windows_frame_cache
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{
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/* ImageBase for the module. */
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CORE_ADDR image_base;
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/* Function start and end rva. */
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CORE_ADDR start_rva;
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CORE_ADDR end_rva;
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/* Next instruction to be executed. */
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CORE_ADDR pc;
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/* Current sp. */
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CORE_ADDR sp;
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/* Address of saved integer and xmm registers. */
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CORE_ADDR prev_reg_addr[16];
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CORE_ADDR prev_xmm_addr[16];
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/* These two next fields are set only for machine info frames. */
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/* Likewise for RIP. */
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CORE_ADDR prev_rip_addr;
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/* Likewise for RSP. */
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CORE_ADDR prev_rsp_addr;
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/* Address of the previous frame. */
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CORE_ADDR prev_sp;
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};
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/* Convert a Windows register number to gdb. */
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static const enum amd64_regnum amd64_windows_w2gdb_regnum[] =
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{
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AMD64_RAX_REGNUM,
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AMD64_RCX_REGNUM,
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AMD64_RDX_REGNUM,
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AMD64_RBX_REGNUM,
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AMD64_RSP_REGNUM,
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AMD64_RBP_REGNUM,
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AMD64_RSI_REGNUM,
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AMD64_RDI_REGNUM,
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AMD64_R8_REGNUM,
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AMD64_R9_REGNUM,
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AMD64_R10_REGNUM,
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AMD64_R11_REGNUM,
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AMD64_R12_REGNUM,
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AMD64_R13_REGNUM,
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AMD64_R14_REGNUM,
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AMD64_R15_REGNUM
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};
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/* Return TRUE iff PC is the the range of the function corresponding to
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CACHE. */
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static int
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pc_in_range (CORE_ADDR pc, const struct amd64_windows_frame_cache *cache)
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{
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return (pc >= cache->image_base + cache->start_rva
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&& pc < cache->image_base + cache->end_rva);
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}
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/* Try to recognize and decode an epilogue sequence.
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Return -1 if we fail to read the instructions for any reason.
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Return 1 if an epilogue sequence was recognized, 0 otherwise. */
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static int
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amd64_windows_frame_decode_epilogue (struct frame_info *this_frame,
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struct amd64_windows_frame_cache *cache)
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{
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/* According to MSDN an epilogue "must consist of either an add RSP,constant
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or lea RSP,constant[FPReg], followed by a series of zero or more 8-byte
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register pops and a return or a jmp".
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Furthermore, according to RtlVirtualUnwind, the complete list of
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epilog marker is:
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- ret [c3]
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- ret n [c2 imm16]
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- rep ret [f3 c3]
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- jmp imm8 | imm32 [eb rel8] or [e9 rel32]
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- jmp qword ptr imm32 - not handled
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- rex.w jmp reg [4X ff eY]
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*/
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CORE_ADDR pc = cache->pc;
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CORE_ADDR cur_sp = cache->sp;
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struct gdbarch *gdbarch = get_frame_arch (this_frame);
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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gdb_byte op;
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gdb_byte rex;
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/* We don't care about the instruction deallocating the frame:
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if it hasn't been executed, the pc is still in the body,
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if it has been executed, the following epilog decoding will work. */
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/* First decode:
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- pop reg [41 58-5f] or [58-5f]. */
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while (1)
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{
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/* Read opcode. */
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if (target_read_memory (pc, &op, 1) != 0)
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return -1;
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if (op >= 0x40 && op <= 0x4f)
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{
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/* REX prefix. */
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rex = op;
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/* Read opcode. */
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if (target_read_memory (pc + 1, &op, 1) != 0)
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return -1;
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}
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else
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rex = 0;
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if (op >= 0x58 && op <= 0x5f)
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{
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/* pop reg */
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gdb_byte reg = (op & 0x0f) | ((rex & 1) << 3);
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cache->prev_reg_addr[amd64_windows_w2gdb_regnum[reg]] = cur_sp;
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cur_sp += 8;
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}
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else
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break;
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/* Allow the user to break this loop. This shouldn't happen as the
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number of consecutive pop should be small. */
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QUIT;
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}
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/* Then decode the marker. */
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/* Read opcode. */
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if (target_read_memory (pc, &op, 1) != 0)
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return -1;
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switch (op)
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{
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case 0xc3:
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/* Ret. */
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cache->prev_rip_addr = cur_sp;
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cache->prev_sp = cur_sp + 8;
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return 1;
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case 0xeb:
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{
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/* jmp rel8 */
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gdb_byte rel8;
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CORE_ADDR npc;
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if (target_read_memory (pc + 1, &rel8, 1) != 0)
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return -1;
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npc = pc + 2 + (signed char) rel8;
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/* If the jump is within the function, then this is not a marker,
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otherwise this is a tail-call. */
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return !pc_in_range (npc, cache);
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}
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case 0xec:
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{
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/* jmp rel32 */
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gdb_byte rel32[4];
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CORE_ADDR npc;
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if (target_read_memory (pc + 1, rel32, 4) != 0)
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return -1;
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npc = pc + 5 + extract_signed_integer (rel32, 4, byte_order);
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/* If the jump is within the function, then this is not a marker,
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otherwise this is a tail-call. */
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return !pc_in_range (npc, cache);
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}
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case 0xc2:
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{
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/* ret n */
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gdb_byte imm16[2];
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if (target_read_memory (pc + 1, imm16, 2) != 0)
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return -1;
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cache->prev_rip_addr = cur_sp;
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cache->prev_sp = cur_sp
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+ extract_unsigned_integer (imm16, 4, byte_order);
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return 1;
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}
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case 0xf3:
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{
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/* rep; ret */
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gdb_byte op1;
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if (target_read_memory (pc + 2, &op1, 1) != 0)
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return -1;
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if (op1 != 0xc3)
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return 0;
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cache->prev_rip_addr = cur_sp;
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cache->prev_sp = cur_sp + 8;
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return 1;
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}
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case 0x40:
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case 0x41:
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case 0x42:
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case 0x43:
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case 0x44:
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case 0x45:
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case 0x46:
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case 0x47:
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case 0x48:
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case 0x49:
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case 0x4a:
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case 0x4b:
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case 0x4c:
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case 0x4d:
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case 0x4e:
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case 0x4f:
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/* Got a REX prefix, read next byte. */
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rex = op;
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if (target_read_memory (pc + 1, &op, 1) != 0)
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return -1;
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if (op == 0xff)
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{
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/* rex jmp reg */
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gdb_byte op1;
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unsigned int reg;
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gdb_byte buf[8];
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if (target_read_memory (pc + 2, &op1, 1) != 0)
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return -1;
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return (op1 & 0xf8) == 0xe0;
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}
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else
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return 0;
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default:
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/* Not REX, so unknown. */
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return 0;
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}
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}
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/* Decode and execute unwind insns at UNWIND_INFO. */
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static void
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amd64_windows_frame_decode_insns (struct frame_info *this_frame,
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struct amd64_windows_frame_cache *cache,
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CORE_ADDR unwind_info)
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{
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CORE_ADDR save_addr = 0;
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CORE_ADDR cur_sp = cache->sp;
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struct gdbarch *gdbarch = get_frame_arch (this_frame);
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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int j;
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for (j = 0; ; j++)
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{
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struct external_pex64_unwind_info ex_ui;
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/* There are at most 256 16-bit unwind insns. */
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gdb_byte insns[2 * 256];
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gdb_byte *p;
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gdb_byte *end_insns;
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unsigned char codes_count;
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unsigned char frame_reg;
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unsigned char frame_off;
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/* Read and decode header. */
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if (target_read_memory (cache->image_base + unwind_info,
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(gdb_byte *) &ex_ui, sizeof (ex_ui)) != 0)
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return;
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if (frame_debug)
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fprintf_unfiltered
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(gdb_stdlog,
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"amd64_windows_frame_decodes_insn: "
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"%s: ver: %02x, plgsz: %02x, cnt: %02x, frame: %02x\n",
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paddress (gdbarch, unwind_info),
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ex_ui.Version_Flags, ex_ui.SizeOfPrologue,
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ex_ui.CountOfCodes, ex_ui.FrameRegisterOffset);
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/* Check version. */
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if (PEX64_UWI_VERSION (ex_ui.Version_Flags) != 1)
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return;
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if (j == 0
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&& (cache->pc >=
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cache->image_base + cache->start_rva + ex_ui.SizeOfPrologue))
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{
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/* Not in the prologue. We want to detect if the PC points to an
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epilogue. If so, the epilogue detection+decoding function is
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sufficient. Otherwise, the unwinder will consider that the PC
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is in the body of the function and will need to decode unwind
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info. */
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if (amd64_windows_frame_decode_epilogue (this_frame, cache) == 1)
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return;
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/* Not in an epilog. Clear possible side effects. */
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memset (cache->prev_reg_addr, 0, sizeof (cache->prev_reg_addr));
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}
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codes_count = ex_ui.CountOfCodes;
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frame_reg = PEX64_UWI_FRAMEREG (ex_ui.FrameRegisterOffset);
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if (frame_reg != 0)
|
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{
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/* According to msdn:
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If an FP reg is used, then any unwind code taking an offset must
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only be used after the FP reg is established in the prolog. */
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gdb_byte buf[8];
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int frreg = amd64_windows_w2gdb_regnum[frame_reg];
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get_frame_register (this_frame, frreg, buf);
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save_addr = extract_unsigned_integer (buf, 8, byte_order);
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if (frame_debug)
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fprintf_unfiltered (gdb_stdlog, " frame_reg=%s, val=%s\n",
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gdbarch_register_name (gdbarch, frreg),
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paddress (gdbarch, save_addr));
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}
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/* Read opcodes. */
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if (codes_count != 0
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&& target_read_memory (cache->image_base + unwind_info
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+ sizeof (ex_ui),
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insns, codes_count * 2) != 0)
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return;
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end_insns = &insns[codes_count * 2];
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for (p = insns; p < end_insns; p += 2)
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{
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int reg;
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|
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if (frame_debug)
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fprintf_unfiltered
|
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(gdb_stdlog, " op #%u: off=0x%02x, insn=0x%02x\n",
|
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(unsigned) (p - insns), p[0], p[1]);
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||||
|
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/* Virtually execute the operation. */
|
||||
if (cache->pc >= cache->image_base + cache->start_rva + p[0])
|
||||
{
|
||||
/* If there is no frame registers defined, the current value of
|
||||
rsp is used instead. */
|
||||
if (frame_reg == 0)
|
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save_addr = cur_sp;
|
||||
|
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switch (PEX64_UNWCODE_CODE (p[1]))
|
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{
|
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case UWOP_PUSH_NONVOL:
|
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/* Push pre-decrements RSP. */
|
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reg = amd64_windows_w2gdb_regnum[PEX64_UNWCODE_INFO (p[1])];
|
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cache->prev_reg_addr[reg] = cur_sp;
|
||||
cur_sp += 8;
|
||||
break;
|
||||
case UWOP_ALLOC_LARGE:
|
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if (PEX64_UNWCODE_INFO (p[1]) == 0)
|
||||
cur_sp +=
|
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8 * extract_unsigned_integer (p + 2, 2, byte_order);
|
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else if (PEX64_UNWCODE_INFO (p[1]) == 1)
|
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cur_sp += extract_unsigned_integer (p + 2, 4, byte_order);
|
||||
else
|
||||
return;
|
||||
break;
|
||||
case UWOP_ALLOC_SMALL:
|
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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;
|
||||
}
|
||||
}
|
||||
|
||||
/* 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)
|
||||
break;
|
||||
else
|
||||
{
|
||||
/* Read the chained unwind info. */
|
||||
struct external_pex64_runtime_function d;
|
||||
CORE_ADDR chain_vma;
|
||||
|
||||
chain_vma = cache->image_base + unwind_info
|
||||
+ sizeof (ex_ui) + ((codes_count + 1) & ~1) * 2 + 8;
|
||||
|
||||
if (target_read_memory (chain_vma, (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);
|
||||
}
|
||||
|
||||
/* 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
|
||||
+ ANOFFSET (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));
|
||||
|
||||
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;
|
||||
CORE_ADDR sa, ea;
|
||||
|
||||
if (target_read_memory (base + (*unwind_info & ~1),
|
||||
(gdb_byte *) &d, sizeof (d)) != 0)
|
||||
return -1;
|
||||
|
||||
*start_rva =
|
||||
extract_unsigned_integer (d.rva_BeginAddress, 4, byte_order);
|
||||
*end_rva = extract_unsigned_integer (d.rva_EndAddress, 4, byte_order);
|
||||
*unwind_info =
|
||||
extract_unsigned_integer (d.rva_UnwindData, 4, byte_order);
|
||||
|
||||
}
|
||||
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];
|
||||
struct obj_section *sec;
|
||||
pe_data_type *pe;
|
||||
IMAGE_DATA_DIRECTORY *dir;
|
||||
CORE_ADDR image_base;
|
||||
CORE_ADDR pc;
|
||||
struct objfile *objfile;
|
||||
unsigned long lo, hi;
|
||||
CORE_ADDR unwind_info = 0;
|
||||
|
||||
if (*this_cache)
|
||||
return *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);
|
||||
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
||||
struct amd64_windows_frame_cache *cache =
|
||||
amd64_windows_frame_cache (this_frame, this_cache);
|
||||
struct value *val;
|
||||
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 gdbarch *gdbarch = get_frame_arch (this_frame);
|
||||
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 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 max (pc, post_prologue_pc);
|
||||
}
|
||||
|
||||
return pc;
|
||||
}
|
||||
|
||||
/* Check Win64 DLL jmp trampolines and find jump destination. */
|
||||
|
||||
static CORE_ADDR
|
||||
|
@ -205,6 +957,19 @@ 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 correcly 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);
|
||||
|
||||
/* On Windows, "long"s are only 32bit. */
|
||||
|
@ -225,6 +990,8 @@ amd64_windows_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
|
|||
set_gdbarch_iterate_over_objfiles_in_search_order
|
||||
(gdbarch, windows_iterate_over_objfiles_in_search_order);
|
||||
|
||||
set_gdbarch_skip_prologue (gdbarch, amd64_windows_skip_prologue);
|
||||
|
||||
set_gdbarch_auto_wide_charset (gdbarch, amd64_windows_auto_wide_charset);
|
||||
|
||||
set_solib_ops (gdbarch, &solib_target_so_ops);
|
||||
|
@ -239,4 +1006,3 @@ _initialize_amd64_windows_tdep (void)
|
|||
gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64, GDB_OSABI_CYGWIN,
|
||||
amd64_windows_init_abi);
|
||||
}
|
||||
|
||||
|
|
Loading…
Reference in New Issue