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823163
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0
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0
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CreationDate
2009-05-05T03:18:32.630
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2009-05-05T03:59:00.410
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2009-05-05T03:59:00.410
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63309
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63309
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823138
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2
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4
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0
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text
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Well, dont know much about GAS, and i'm a little rusty on Intel assembly, but it looks like its initializing main's stack frame. if you take a look, __main is some kind of macro, must be executing initializations. Then, as main's body is empty, it calls leave instruction, to return to the function that called main. From <a href="http://en.wikibooks.org/wiki/X86_Assembly/GAS_Syntax#.22hello.s.22_line-by-line" rel="nofollow noreferrer">http://en.wikibooks.org/wiki/X86_Assembly/GAS_Syntax#.22hello.s.22_line-by-line</a>: This line declares the "_main" label, marking the place that is called from the startup code. <pre><code> pushl %ebp movl %esp, %ebp subl $8, %esp </code></pre> These lines save the value of EBP on the stack, then move the value of ESP into EBP, then subtract 8 from ESP. The "l" on the end of each opcode indicates that we want to use the version of the opcode that works with "long" (32-bit) operands; <pre><code> andl $-16, %esp </code></pre> This code "and"s ESP with 0xFFFF0000, aligning the stack with the next lowest 16-byte boundary. (neccesary when using simd instructions, not useful here) <pre><code> movl $0, %eax movl %eax, -4(%ebp) movl -4(%ebp), %eax </code></pre> This code moves zero into EAX, then moves EAX into the memory location EBP-4, which is in the temporary space we reserved on the stack at the beginning of the procedure. Then it moves the memory location EBP-4 back into EAX; clearly, this is not optimized code. <pre><code> call __alloca call ___main </code></pre> These functions are part of the C library setup. Since we are calling functions in the C library, we probably need these. The exact operations they perform vary depending on the platform and the version of the GNU tools that are installed. Here's a useful link. <a href="http://unixwiz.net/techtips/win32-callconv-asm.html" rel="nofollow noreferrer">http://unixwiz.net/techtips/win32-callconv-asm.html</a>
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1. POUnderstanding empty main()'s translation into assembly
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