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The fact that the stack pointer does not change at all between the prolog and the epilog is a characteristic feature of X64 functions, as shown in Figure 3.
Suppose the following C structure: #pragma pack(push, 1) struct MyStruct #pragma pack(pop Since push and pop instructions alter the stack pointer, X64 functions restrict push and pop instructions to the function prolog and epilog respectively. So, to make it working A common need when writing 圆4 assembler code is working with structures that are common to C/C++ and the ASM code. That's why you need to use wow64ext library, it gives you access to 64bit NTDLL and WOW64 dlls from x86 application. If you compile it as x86 it will also fail, because wow64cpu.dll is 64-bit DLL and it is not accessible through standard 32-bit GetModuleHandle/GetProcAddress. 圆4 extends x86's 8 general-purpose registers to be 64-bit, and adds 8 new 64-bit registers If you compile this code as 圆4 executable, then there is no wow64cpu.dll in memory, because it is loaded only for x86 executables on 圆4 OS, so GetModuleHandle will fail. The instruction sets are close to identical. The term 圆4 includes both AMD 64 and Intel64. It provides a legacy 32-bit mode, which is identical to x86, and a new 64-bit mode. The 圆4 architecture is a backwards-compatible extension of x86. Some assemblers may force the operand size to 16 when PUSHA is used and to 32 when PUSHAD is used The PUSHA instruction is intended for use when the operand-size attribute is 16 and the PUSHAD instruction for when the operand-size attribute is 32. So it does not really matter which you use The PUSHA (push all) and PUSHAD (push all double) mnemonics reference the same opcode. In /x86 mode, GoAsm treats PUSH RAX as equivalent to PUSH EAX.
To help with compatibility of source code, GoAsm treats (for example) PUSH EAX as equivalent to PUSH RAX. This means that PUSH 32-bit register is no longer a recognised instruction on the AMD64. Intel named their implementation IA-32e and then EMT64 In the AMD64, each PUSH and POP instruction moves the stack pointer by 8 bytes instead of 4 bytes as in the 86 processor. AMD introduced the first version of 圆4, initially called x86-64 and later renamed AMD64. addresses in 64-bit may or may not fit into 32 bits 圆4 is a generic name for the 64-bit extensions to Intel's and AMD's 32-bit x86 instruction set architecture (ISA). however, you can push a 32-bit immediate value, which is sign extended. what they are saying is, there is no instruction to push 64-bit immediates.
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Does each PUSH instruction push a multiple of 8 bytes on 圆4? (yes, unless you specifically use a 16-bit push, but 32-bit isn't available) Windows 圆4 guarantees / require 16-byte alignment of RSP before a call, so a function has to adjust RSP by n*16 + 8 before making another call to maintain that alignment. push's default operand-size is 64-bit, and 32-bit operand-size is not available.
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Example #1 The general idea is that you normally push and pop full registers, i.e. Programming Language: C++ (Cpp) Method/Function: X64_Push. You can rate examples to help us improve the quality of examples. These are the top rated real world C++ (Cpp) examples of X64_Push extracted from open source projects.
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