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Top Forums Programming Does the assembler output differ between operating systems ? Post 302387343 by jim mcnamara on Friday 15th of January 2010 10:28:42 AM
Old 01-15-2010
Yes, it can. One reason is the structure/symbol nomenclature of runtime libraries. Another reason is entry points (names) for system calls are not prescribed by any standard, so they could be almost any name the kernel designer decides to use.

This assumes you meant for example, windoze vs unix vs xenix or something like that.
The differences between Linux Suse and Ubuntu, which I have looked at, are minimal.

One thing that can radically change the assembler code, even for the same OS and identical code, is the optimization level. Loop unrolling for example.
 

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ERR_GET_LIB(3)							      OpenSSL							    ERR_GET_LIB(3)

NAME
ERR_GET_LIB, ERR_GET_FUNC, ERR_GET_REASON - get library, function and reason code SYNOPSIS
#include <openssl/err.h> int ERR_GET_LIB(unsigned long e); int ERR_GET_FUNC(unsigned long e); int ERR_GET_REASON(unsigned long e); DESCRIPTION
The error code returned by ERR_get_error() consists of a library number, function code and reason code. ERR_GET_LIB(), ERR_GET_FUNC() and ERR_GET_REASON() can be used to extract these. The library number and function code describe where the error occurred, the reason code is the information about what went wrong. Each sub-library of OpenSSL has a unique library number; function and reason codes are unique within each sub-library. Note that different libraries may use the same value to signal different functions and reasons. ERR_R_... reason codes such as ERR_R_MALLOC_FAILURE are globally unique. However, when checking for sub-library specific reason codes, be sure to also compare the library number. ERR_GET_LIB(), ERR_GET_FUNC() and ERR_GET_REASON() are macros. RETURN VALUES
The library number, function code and reason code respectively. SEE ALSO
err(3), ERR_get_error(3) HISTORY
ERR_GET_LIB(), ERR_GET_FUNC() and ERR_GET_REASON() are available in all versions of SSLeay and OpenSSL. 0.9.7a 2000-01-31 ERR_GET_LIB(3)
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