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This appendix describes some special behaviors which vary from operating system to operating system. This is described in table (OSBehave) . The GCC saved registers indicates what registers are saved when certain declaration modifiers are used.
| Operating systems | Min. param. stack align | GCC saved registers |
| Amiga | 2 | D2..D7,A2..A5 |
| Atari | 2 | D2..D7,A2..A5 |
| BeOS-x86 | 4 | ESI, EDI, EBX |
| DOS | 2 | ESI, EDI, EBX |
| FreeBSD | 4 | ESI, EDI, EBX |
| linux-m68k | D2..D7,A2..A5 | |
| linux-x86 | 4 | ESI, EDI, EBX |
| MacOS-68k | D2..D7,A2..A5 | |
| NetBSD-x86 | ESI, EDI, EBX | |
| NetBSD-m68k | D2..D7,A2..A5 | |
| OS/2 | 4 | ESI, EDI, EBX |
| PalmOS | 2 | D2..D7,A2..A5 |
| QNX-x86 | ESI, EDI, EBX | |
| Solaris-x86 | 4 | ESI, EDI, EBX |
| Win32 | 4 | ESI, EDI, EBX |