diff options
| author | Shravan Narayan <shravanrn@gmail.com> | 2024-07-15 17:06:24 -0500 |
|---|---|---|
| committer | Shravan Narayan <shravanrn@gmail.com> | 2024-09-06 16:48:31 -0500 |
| commit | c6853eb4857908072fd1d7c28dffb1d2613a0ee6 (patch) | |
| tree | 78ef4f5369ee821c94aa643f7b82ebca726d6ad4 /wasm2c/wasm-rt.h | |
| parent | e3b16dae4166b138bbd04bbe67281f4fa47fd4de (diff) | |
| download | wabt-c6853eb4857908072fd1d7c28dffb1d2613a0ee6.tar.gz wabt-c6853eb4857908072fd1d7c28dffb1d2613a0ee6.tar.bz2 wabt-c6853eb4857908072fd1d7c28dffb1d2613a0ee6.zip | |
wasm2c: Segue support for CPUs without wrgsbase instructions
Diffstat (limited to 'wasm2c/wasm-rt.h')
| -rw-r--r-- | wasm2c/wasm-rt.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/wasm2c/wasm-rt.h b/wasm2c/wasm-rt.h index 5c07ff44..c489c850 100644 --- a/wasm2c/wasm-rt.h +++ b/wasm2c/wasm-rt.h @@ -294,6 +294,27 @@ extern WASM_RT_THREAD_LOCAL uint32_t wasm_rt_call_stack_depth; #endif +#if WASM_RT_USE_SEGUE || WASM_RT_ALLOW_SEGUE +/** + * The segue optimization uses x86 segments to point to a linear memory. If + * used, the runtime must query whether it can use the fast userspace wrgsbase + * instructions or whether it must invoke syscalls to set the segment base, + * depending on the supported CPU features. The result of this query is saved in + * this variable. + */ +extern bool wasm_rt_fsgsbase_inst_supported; +/** + * If fast userspace wrgsbase instructions don't exist, the runtime most provide + * a function that invokes the OS' underlying syscall to set the segment base. + */ +void wasm_rt_syscall_set_segue_base(void* base); +/** + * If fast userspace rdgsbase instructions don't exist, the runtime most provide + * a function that invokes the OS' underlying syscall to get the segment base. + */ +void* wasm_rt_syscall_get_segue_base(); +#endif + #if defined(_MSC_VER) #define WASM_RT_NO_RETURN __declspec(noreturn) #else |