From 998a943933faea807ca11b9b5c77d44d53e66577 Mon Sep 17 00:00:00 2001 From: "Kartik K. Agaram" Date: Thu, 12 Oct 2017 22:36:38 -0700 Subject: 4045 --- subx/011add.cc | 27 ++++++++++++++++++++++++--- 1 file changed, 24 insertions(+), 3 deletions(-) diff --git a/subx/011add.cc b/subx/011add.cc index 5fe3523b..5bcd62d8 100644 --- a/subx/011add.cc +++ b/subx/011add.cc @@ -56,19 +56,21 @@ int32_t* effective_address(uint8_t modrm) { % Reg[3].i = 1; # op ModRM SIB displacement immediate 81 c3 0a 0b 0c 0d # add 0x0d0c0b0a to EBX (reg 3) -+run: add imm32 0x0d0c0b0a to effective address ++run: combine imm32 0x0d0c0b0a with effective address +run: effective address is reg 3 ++run: subop add +run: storing 0x0d0c0b0b :(before "End Single-Byte Opcodes") case 0x81: { // combine imm32 with r/m32 uint8_t modrm = next(); int32_t arg2 = imm32(); - trace(2, "run") << "add imm32 0x" << HEXWORD << arg2 << " to effective address" << end(); + trace(2, "run") << "combine imm32 0x" << HEXWORD << arg2 << " with effective address" << end(); int32_t* arg1 = effective_address(modrm); uint8_t subop = (modrm>>3)&0x7; // middle 3 'reg opcode' bits switch (subop) { case 0: + trace(2, "run") << "subop add" << end(); BINARY_ARITHMETIC_OP(+, *arg1, arg2); break; // End Op 81 Subops @@ -93,8 +95,9 @@ case 3: % Mem.at(0x60) = 1; # op ModR/M SIB displacement immediate 81 03 0a 0b 0c 0d # add 0x0d0c0b0a to *EBX (reg 3) -+run: add imm32 0x0d0c0b0a to effective address ++run: combine imm32 0x0d0c0b0a with effective address +run: effective address is mem at address 0x60 (reg 3) ++run: subop add +run: storing 0x0d0c0b0b //: @@ -135,3 +138,21 @@ case 0x2d: { // subtract imm32 from EAX BINARY_ARITHMETIC_OP(-, Reg[EAX].i, arg2); break; } + +//: + +:(scenario sub_imm32_from_r32) +% Reg[3].i = 10; +# op ModRM SIB displacement immediate + 81 eb 01 00 00 00 # subtract 1 from EBX (reg 3) ++run: combine imm32 0x00000001 with effective address ++run: effective address is reg 3 ++run: subop subtract ++run: storing 0x00000009 + +:(before "End Op 81 Subops") +case 5: { + trace(2, "run") << "subop subtract" << end(); + BINARY_ARITHMETIC_OP(-, *arg1, arg2); + break; +} -- cgit 1.4.1-2-gfad0 'txt' type='search' size='10' name='q' value=''/>
path: root/064random.cc
blob: bd171132b1cba500fad12c2bbb0d20c9e4cd401d (plain) (tree) 
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