From 9e45873ff4a5af5fc2bb2fcab90accef171900f1 Mon Sep 17 00:00:00 2001 From: "Kartik K. Agaram" Date: Wed, 18 Oct 2017 00:57:46 -0700 Subject: 4079 subx: 'pop' --- subx/012indirect_addressing.cc | 41 ++++++++++++++++++++++++++++++++++------- 1 file changed, 34 insertions(+), 7 deletions(-) (limited to 'subx/012indirect_addressing.cc') diff --git a/subx/012indirect_addressing.cc b/subx/012indirect_addressing.cc index 1bf5e378..b4821856 100644 --- a/subx/012indirect_addressing.cc +++ b/subx/012indirect_addressing.cc @@ -327,13 +327,40 @@ case 0xff: { // jump to r/m32 uint8_t modrm = next(); uint8_t subop = (modrm>>3)&0x7; // middle 3 'reg opcode' bits switch (subop) { - case 4: - trace(2, "run") << "jump to effective address" << end(); - int32_t* arg2 = effective_address(modrm); - EIP = *arg2; - trace(2, "run") << "jumping to 0x" << HEXWORD << EIP << end(); - break; - // End Op ff Subops + case 4: { + trace(2, "run") << "jump to effective address" << end(); + int32_t* arg2 = effective_address(modrm); + EIP = *arg2; + trace(2, "run") << "jumping to 0x" << HEXWORD << EIP << end(); + break; + } + // End Op ff Subops } break; } + +//:: push + +:(scenario push_mem_at_r32) +% Reg[0].i = 0x60; +% SET_WORD_IN_MEM(0x60, 0x000000af); +% Reg[ESP].u = 0x14; +# op ModRM SIB displacement immediate + ff 30 # push *EAX (reg 0) to stack ++run: push effective address ++run: effective address is mem at address 0x60 (reg 0) ++run: ESP is now 0x00000010 ++run: contents at ESP: 0x000000af + +:(before "End Op ff Subops") +case 6: { + trace(2, "run") << "push effective address" << end(); + const int32_t* val = effective_address(modrm); + trace(2, "run") << "pushing value 0x" << HEXWORD << *val << end(); + Reg[ESP].u -= 4; + *reinterpret_cast(&Mem.at(Reg[ESP].u)) = *val; + trace(2, "run") << "ESP is now 0x" << HEXWORD << Reg[ESP].u << end(); + trace(2, "run") << "contents at ESP: 0x" << HEXWORD << *reinterpret_cast(&Mem.at(Reg[ESP].u)) << end(); + break; +} + -- cgit 1.4.1-2-gfad0 qt'>
path: root/091socket.cc
blob: 7b6ca5b1b6450f01535ea8f6bf478cece0e8b8a9 (plain) (tree) 
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