Add a preprocessor definitions to indidcate the landing pad labeling … #76
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kito-cheng
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mylai-mtk
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May 14, 2024
riscv-c-api.md
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| | __riscv_landing_pad_simple | 1 | Constant value for the simple labeling scheme. | | ||
| | __riscv_landing_pad_func_sig | 2 | Constant value for the function signature based labeling scheme. | |
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| __riscv_landing_pad_simple | 1 | Defined if the "simple" landing pad is in use. Constant value for the simple labeling scheme. |
| __riscv_landing_pad_func_sig | 2 | Defined if the "func_sig" landing pad is in use. Constant value for the function signature based labeling scheme. |
Add some conditions to spare the preprocessor from bloated macros?
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But if we are to limit when these macros are defined, why not just use:
#if defined(__riscv_zicfilp_landing_pad_simple)
...
#elif defined(__riscv_zicfilp_landing_pad_func_sig)
...
#endif? This avoids more new macros, and it's clear when these macros would be defined, and when they would not.
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Updated, but I keep __riscv_landing_pad for now, we could remove that later...if that is not really used in anywhere :)
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…scheme and shadow stack.
Also add 2 more macros to let user able to determine the scheme.
Example code:
```c
#ifdef __riscv_landing_pad
#if defined(__riscv_landing_pad_unlabeled)
...
#elif defined(__riscv_landing_pad_func_sig)
...
#else
#error "Unknown labeling scheme"
#endif
#endif
```
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…scheme and shadow stack
Also add 2 more macro to let user able to determine the scheme.
Example code: