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x86_64/README
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Niels Möller
Fixes for w64 ABI.
02 июн 2014, 00:46
02 июн 2014, 00:46
edf2b37
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ABI, according to http://www.x86-64.org/documentation/abi-0.99.pdf: Up to 6 integer and pointer arguments are passed in registers. Nine registers, %rax, %rcx, %rdx, %rsi, %rdi and %r8-%r11 can be used freely. Integers and pointers are returned in %rax. At entry, it is required that %rsp == 8 (mod 16). Registers May be Argument clobbered number %rax Y %rbx %rcx Y 4 %rdx Y 3 %rbp %rsi Y 2 %rdi Y 1 %rsp (SP) %r8 Y 5 %r9 Y 6 %r10 Y %r11 Y %r12 %r13 %r14 %r15 W64 ABI, according to http://msdn.microsoft.com/en-us/library/9z1stfyw.aspx: Registers May be Argument clobbered number %rax Y %rbx %rcx Y 1 %rdx Y 2 %rbp %rsi %rdi %rsp (SP) %r8 Y 3 %r9 Y 4 %r10 Y %r11 Y %r12 %r13 %r14 %r15 Additional arguments are passed on the stack. "backing store" on the stack for the four register arguments is also required. %xmm6 to %xmm15 are callee-saved. The "long" type is just 32 bits. If we have six arguments, and push the additional callee-save registers %rdi and %rsi on the stack, we get a stack frame like 64(%rsp): Sixth argument 56(%rsp): Fifth argument 48(%rsp): Space for fourth argument 40(%rsp): Space for third argument 32(%rsp): Space for second argument 24(%rsp): Space for first argument 16(%rsp): Return address 8(%rsp) : Saved %rdi (%rsp): Saved %rsi If, in addition, we use more than 6 %xmm registers, we push them *after* %rdi (but before %rsi), so that they are stored at 16-byte aligned addresses.