Calling Conventions: Difference between revisions
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==Basics== |
==Basics== |
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As a general rule, a function which follows the C calling conventions, and is appropriately declared (see below) in the C headers, can be called as a normal C function. Most of the burden for following the calling rules falls upon the assembly program. |
As a general rule, a function which follows the C calling conventions, and is appropriately declared (see below) in the C headers, can be called as a normal C function. Most of the burden for following the calling rules falls upon the assembly program. |
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== Cheat Sheets == |
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{| {{wikitable}} |
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! Platform |
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! Return Value |
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! Parameter Registers |
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! Additional Parameters |
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! Stack Alignment |
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! Scratch Registers |
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! Preserved Registers |
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|- |
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| System V i386 || eax, edx || none || stack || || eax, ecx, edx || ebx, esi, edi, ebp, esp |
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|- |
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| System V X86_64 || rax, rdx || rdi, rsi, rdx, rcx, r8, r9 || stack || 16-byte at call<sup>[[#Note1|1]]</sup> || rax, rdi, rsi, rdx, rcx, r8, r9, r10, r11 || rbx, rsp, rbp, r12, r13, r14, r15 |
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|- |
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| ARM || r0, r1 || r0, r1, r2, r3 || stack || 8 byte<sup>[[#Note2|2]]</sup> || r0, r1, r2, r3, r12 || r4, r5, r6, r7, r8, r9, r10, r11, r13, r14 |
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|} |
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<small id="Note1">Note 1: Stack is 16 byte aligned at time of call. The call pushes %rip, so the stack is 16-byte aligned again if the callee pushes %rbp.</small> |
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<small id="Note2">Note 2: Stack is 8 byte aligned at all times outside of prologue/epilogue of function.</small> |
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==External References== |
==External References== |
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