From efa07ef088bfdb2bd96ae80df15bde7d8cff8e20 Mon Sep 17 00:00:00 2001
From: tuz358 <orca00358@gmail.com>
Date: Tue, 13 Mar 2018 11:02:10 +0900
Subject: [PATCH] Add sbb_r32_rm32(0x1b) instruction

---
 include/instructions.h |  1 +
 instructions.cpp       | 51 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 52 insertions(+)

diff --git a/include/instructions.h b/include/instructions.h
index c40799f..05c1e7d 100644
--- a/include/instructions.h
+++ b/include/instructions.h
@@ -38,6 +38,7 @@ public:
   void adc_r32_rm32();  // 0x13
   void adc_eax_imm32(); // 0x15
   void sbb_rm32_r32();  // 0x19
+  void sbb_r32_rm32();  // 0x1b
   void and_rm32_r32();  // 0x21
   void and_r32_rm32();  // 0x23
   void and_eax_imm32(); // 0x25
diff --git a/instructions.cpp b/instructions.cpp
index 83a54e3..7e3a85c 100644
--- a/instructions.cpp
+++ b/instructions.cpp
@@ -30,6 +30,7 @@ void Instructions::init_instructions(){
   this->instructions[0x13] = &Instructions::adc_r32_rm32;
   this->instructions[0x15] = &Instructions::adc_eax_imm32;
   this->instructions[0x19] = &Instructions::sbb_rm32_r32;
+  this->instructions[0x1b] = &Instructions::sbb_r32_rm32;
   this->instructions[0x21] = &Instructions::and_rm32_r32;
   this->instructions[0x23] = &Instructions::and_r32_rm32;
   this->instructions[0x25] = &Instructions::and_eax_imm32;
@@ -492,6 +493,56 @@ void Instructions::sbb_rm32_r32(){
   }
 }
 
+void Instructions::sbb_r32_rm32(){
+  //printf("sbb_r32_rm32 called.\n");
+  uint32_t addr, dst, imm32;
+  uint8_t imm8;
+
+  this->modrm = memory.read_uint8(this->eip);
+  this->calc_modrm();
+
+  switch (this->mod) {
+    case 0:
+      // sbb R, [M]
+      // addr : M
+      this->eip++;
+      addr = this->registers[this->M];
+      // dst : data of [M]
+      dst = memory.read_uint32(addr);
+      this->registers[this->R] -= dst + get_flag(CF);
+      break;
+    case 1:
+      // sbb R, [M+imm8]
+      this->eip++;
+      imm8 = memory.read_uint8(this->eip);
+      // addr : M
+      addr = this->registers[this->M];
+      // dst : data of [M+imm8]
+      dst = memory.read_uint32(addr + imm8);
+      this->registers[this->R] -= dst + get_flag(CF);
+      this->eip++;
+      break;
+    case 2:
+      // sbb R, [M+imm32]
+      this->eip++;
+      imm32 = memory.read_uint32(this->eip);
+      imm32 = swap_endian32(imm32);
+      // addr : M
+      addr = this->registers[this->M];
+      // dst : data of [M+imm32]
+      dst = memory.read_uint32(addr + imm32);
+      this->registers[this->R] -= dst + get_flag(CF);
+      this->eip += 4;
+      break;
+    default:
+      // case mod == 3
+      // sbb R, M
+      this->eip++;
+      this->registers[this->R] -= this->registers[this->M] + get_flag(CF);
+      break;
+  }
+}
+
 void Instructions::and_rm32_r32(){
   //printf("and_rm32_r32 called.\n");
   uint32_t addr, dst, imm32;