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Fix x86_64 Sys-V ABI section #29
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Adjusts section 1.2 to match the System-V x86_64 psABI, as defined by https://uclibc.org/docs/psABI-x86_64.pdf.
lukflug
suggested changes
Sep 5, 2022
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| If the parameter is of type `float` or `double`, it will be stored in the next | ||
| available SSE register (`XMM0`-`XMM7`). | ||
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| `long double` and structs/unions larger than 32-bytes are passed by the caller allocating space, and passing a pointer to that space in place as an integer parameter |
| A function calling this needs to have at least 32 bytes of stack to store the | ||
| parameters and align the stack upon call. | ||
| parameters in `RDI`, `XMM0`, `RSI`, `RDX`, `RCX`, and `XMM1` respectively. | ||
| As no parameters are passed on the stack, the caller would also have to push 8 bytes before calling the function (which will align the stack by pushing an additional 8 bytes), |
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Adjusts section 1.2 to match the System-V x86_64 psABI, as defined by https://uclibc.org/docs/psABI-x86_64.pdf.
Also removes references to rbp from the stack section, as most compiled code will not push the base pointer nowadays.