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sk3wldbg_x86.cpp
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sk3wldbg_x86.cpp
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/*
Source for Sk3wlDbg IdaPro plugin
Copyright (c) 2016 Chris Eagle
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 2 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, write to the Free Software Foundation, Inc., 59 Temple
Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "sk3wldbg_x86.h"
#include <unicorn/x86.h>
static const char *x86_register_classes[] = {
"General registers",
"Segment registers",
"FPU registers",
"MMX registers",
"XMM registers",
NULL
};
enum X86RegClass {
X86_GENERAL = 1,
X86_SEGMENT = 2,
X86_FPU = 4,
X86_MMX = 8,
X86_XMM = 16
};
static const char *flag_bits[32] = {
"CF", NULL, "PF", NULL, "AF", NULL, "ZF", "SF", "TF", "IF", "DF", "OF",
"IOPL", "IOPL", "NT", NULL, "RF", "VM", "AC", "VIF", "VIP", "ID"
};
static struct register_info_t x86_regs[] = {
{"EAX", REGISTER_ADDRESS, X86_GENERAL, dt_dword, NULL, 0},
{"ECX", REGISTER_ADDRESS, X86_GENERAL, dt_dword, NULL, 0},
{"EDX", REGISTER_ADDRESS, X86_GENERAL, dt_dword, NULL, 0},
{"EBX", REGISTER_ADDRESS, X86_GENERAL, dt_dword, NULL, 0},
{"ESP", REGISTER_SP | REGISTER_ADDRESS, X86_GENERAL, dt_dword, NULL, 0},
{"EBP", REGISTER_FP | REGISTER_ADDRESS, X86_GENERAL, dt_dword, NULL, 0},
{"ESI", REGISTER_ADDRESS, X86_GENERAL, dt_dword, NULL, 0},
{"EDI", REGISTER_ADDRESS, X86_GENERAL, dt_dword, NULL, 0},
{"EIP", REGISTER_IP | REGISTER_ADDRESS, X86_GENERAL, dt_dword, NULL, 0},
{"EFL", 0, X86_GENERAL, dt_dword, flag_bits, 0xdd5},
{"CS", REGISTER_CS, X86_SEGMENT, dt_word, NULL, 0},
{"DS", 0, X86_SEGMENT, dt_word, NULL, 0},
{"SS", REGISTER_SS, X86_SEGMENT, dt_word, NULL, 0},
{"ES", 0, X86_SEGMENT, dt_word, NULL, 0},
{"FS", 0, X86_SEGMENT, dt_word, NULL, 0},
{"GS", 0, X86_SEGMENT, dt_word, NULL, 0}
};
static int32_t x86_reg_map[] = {
UC_X86_REG_EAX, UC_X86_REG_ECX, UC_X86_REG_EDX, UC_X86_REG_EBX,
UC_X86_REG_ESP, UC_X86_REG_EBP, UC_X86_REG_ESI, UC_X86_REG_EDI,
UC_X86_REG_EIP, UC_X86_REG_EFLAGS, UC_X86_REG_CS, UC_X86_REG_DS,
UC_X86_REG_SS, UC_X86_REG_ES, UC_X86_REG_FS, UC_X86_REG_GS
};
static struct register_info_t x64_regs[] = {
{"RAX", REGISTER_ADDRESS, X86_GENERAL, dt_qword, NULL, 0},
{"RCX", REGISTER_ADDRESS, X86_GENERAL, dt_qword, NULL, 0},
{"RDX", REGISTER_ADDRESS, X86_GENERAL, dt_qword, NULL, 0},
{"RBX", REGISTER_ADDRESS, X86_GENERAL, dt_qword, NULL, 0},
{"RSP", REGISTER_SP | REGISTER_ADDRESS, X86_GENERAL, dt_qword, NULL, 0},
{"RBP", REGISTER_FP | REGISTER_ADDRESS, X86_GENERAL, dt_qword, NULL, 0},
{"RSI", REGISTER_ADDRESS, X86_GENERAL, dt_qword, NULL, 0},
{"RDI", REGISTER_ADDRESS, X86_GENERAL, dt_qword, NULL, 0},
{"R8", REGISTER_ADDRESS, X86_GENERAL, dt_qword, NULL, 0},
{"R9", REGISTER_ADDRESS, X86_GENERAL, dt_qword, NULL, 0},
{"R10", REGISTER_ADDRESS, X86_GENERAL, dt_qword, NULL, 0},
{"R11", REGISTER_ADDRESS, X86_GENERAL, dt_qword, NULL, 0},
{"R12", REGISTER_ADDRESS, X86_GENERAL, dt_qword, NULL, 0},
{"R13", REGISTER_ADDRESS, X86_GENERAL, dt_qword, NULL, 0},
{"R14", REGISTER_ADDRESS, X86_GENERAL, dt_qword, NULL, 0},
{"R15", REGISTER_ADDRESS, X86_GENERAL, dt_qword, NULL, 0},
{"RIP", REGISTER_IP | REGISTER_ADDRESS, X86_GENERAL, dt_qword, NULL, 0},
{"EFL", 0, X86_GENERAL, dt_dword, flag_bits, 0xdd5},
{"CS", REGISTER_CS, X86_SEGMENT, dt_word, NULL, 0},
{"DS", 0, X86_SEGMENT, dt_word, NULL, 0},
{"SS", REGISTER_SS, X86_SEGMENT, dt_word, NULL, 0},
{"ES", 0, X86_SEGMENT, dt_word, NULL, 0},
{"FS", 0, X86_SEGMENT, dt_word, NULL, 0},
{"GS", 0, X86_SEGMENT, dt_word, NULL, 0},
};
static int32_t x64_reg_map[] = {
UC_X86_REG_RAX, UC_X86_REG_RCX, UC_X86_REG_RDX, UC_X86_REG_RBX,
UC_X86_REG_RSP, UC_X86_REG_RBP, UC_X86_REG_RSI, UC_X86_REG_RDI,
UC_X86_REG_R8, UC_X86_REG_R9, UC_X86_REG_R10, UC_X86_REG_R11,
UC_X86_REG_R12, UC_X86_REG_R13, UC_X86_REG_R14, UC_X86_REG_R15,
UC_X86_REG_RIP, UC_X86_REG_EFLAGS, UC_X86_REG_CS, UC_X86_REG_DS,
UC_X86_REG_SS, UC_X86_REG_ES, UC_X86_REG_FS, UC_X86_REG_GS
};
sk3wldbg_x86_32::sk3wldbg_x86_32() : sk3wldbg("metapc", UC_ARCH_X86, UC_MODE_32) {
//reset any overridden function pointers and setup register name fields
register_classes = x86_register_classes;
register_classes_default = X86_GENERAL; ///< Mask of default printed register classes
_registers = x86_regs; ///< Array of registers. Use registers() to access it
registers_size = qnumber(x86_regs); ///< Number of registers
reg_map = x86_reg_map;
bpt_bytes = (const uchar *)"\xcc"; ///< Array of bytes for a breakpoint instruction
bpt_size = 1; ///< Size of this array
}
bool sk3wldbg_x86_32::save_ret_addr(uint64_t retaddr) {
uint64_t new_sp = get_sp() - sizeof(uint32_t);
uc_mem_write(uc, new_sp, &retaddr, sizeof(uint32_t));
set_sp(new_sp);
return true;
}
void x86_32_bkpt(uc_engine *uc, sk3wldbg_x86_32 *dbg) {
uc_emu_stop(uc);
dbg->emu_state = RS_PAUSE;
debug_event_t brk;
brk.eid = BREAKPOINT;
brk.pid = dbg->the_process;
brk.tid = dbg->the_threads.front();
brk.ea = (ea_t)dbg->get_pc();
msg("x86 breakpoint hit at: 0x%llx\n", (uint64_t)brk.ea);
brk.handled = true;
brk.bpt.hea = brk.bpt.kea = brk.ea;
dbg->enqueue_debug_evt(brk);
}
void x86_32_code_hook(uc_engine *uc, uint64_t address, uint32_t /*size*/, sk3wldbg_x86_32 *dbg) {
static uint64_t last_pc;
// msg("x86 code hit at: 0x%llx\n", address);
if (last_pc != address && dbg->breakpoints.find((ea_t)address) != dbg->breakpoints.end()) {
uc_emu_stop(uc);
// dbg->emu_state = RS_PAUSE;
dbg->queue_dbg_event(false);
}
last_pc = address;
}
void x86_32_trace(uc_engine * /*uc*/, uint64_t /*address*/, uint32_t /*size*/, void *user_data) {
sk3wldbg_x86_32 *emu = (sk3wldbg_x86_32*)user_data;
//record trace data and continue?
//might need to check for breakpoints in here if other methods fail
}
/*
void sk3wldbg_x86_32::install_initial_hooks() {
uc_hook hh;
uc_err err = uc_hook_add(uc, &hh, UC_HOOK_CODE, x86_32_code_hook, this, 1, 0);
if (err) {
msg("Failed on uc_hook_add(x86_32_code_hook) with error returned: %u\n", err);
}
}
*/
sk3wldbg_x86_64::sk3wldbg_x86_64() : sk3wldbg("metapc", UC_ARCH_X86, UC_MODE_64) {
//reset any overridden function pointers and setup register name fields
register_classes = x86_register_classes;
register_classes_default = X86_GENERAL; ///< Mask of default printed register classes
_registers = x64_regs; ///< Array of registers. Use registers() to access it
registers_size = qnumber(x64_regs); ///< Number of registers
reg_map = x64_reg_map;
bpt_bytes = (const uchar *)"\xcc"; ///< Array of bytes for a breakpoint instruction
bpt_size = 1; ///< Size of this array
}
bool sk3wldbg_x86_64::save_ret_addr(uint64_t retaddr) {
uint64_t new_sp = get_sp() - sizeof(uint64_t);
uc_mem_write(uc, new_sp, &retaddr, sizeof(uint64_t));
set_sp(new_sp);
return true;
}