diff options
Diffstat (limited to 'wasm2c/wasm-rt-impl.c')
| -rw-r--r-- | wasm2c/wasm-rt-impl.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/wasm2c/wasm-rt-impl.c b/wasm2c/wasm-rt-impl.c index 52a42e85..851a4c5a 100644 --- a/wasm2c/wasm-rt-impl.c +++ b/wasm2c/wasm-rt-impl.c @@ -49,6 +49,19 @@ static void* g_sig_handler_handle = 0; #endif #endif +#if WASM_RT_USE_SEGUE || WASM_RT_ALLOW_SEGUE +// Currently Segue is used only for linux +#include <sys/auxv.h> +#ifdef __GLIBC__ +#include <gnu/libc-version.h> +#endif +bool wasm_rt_fsgsbase_inst_supported = false; + +#include <asm/prctl.h> // For ARCH_SET_GS +#include <sys/syscall.h> // For SYS_arch_prctl +#include <unistd.h> // For syscall +#endif + #if WASM_RT_STACK_DEPTH_COUNT WASM_RT_THREAD_LOCAL uint32_t wasm_rt_call_stack_depth; WASM_RT_THREAD_LOCAL uint32_t wasm_rt_saved_call_stack_depth; @@ -220,6 +233,15 @@ void wasm_rt_init(void) { os_install_signal_handler(); } #endif + +#if WASM_RT_USE_SEGUE || WASM_RT_ALLOW_SEGUE +#if defined(__GLIBC__) && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 18 + // Check for support for userspace wrgsbase instructions + unsigned long val = getauxval(AT_HWCAP2); + wasm_rt_fsgsbase_inst_supported = val & (1 << 1); +#endif +#endif + assert(wasm_rt_is_initialized()); } @@ -257,6 +279,23 @@ void wasm_rt_free_thread(void) { #endif } +#if WASM_RT_USE_SEGUE || WASM_RT_ALLOW_SEGUE +void wasm_rt_syscall_set_segue_base(void* base) { + if (syscall(SYS_arch_prctl, ARCH_SET_GS, base) != 0) { + perror("wasm_rt_syscall_set_segue_base error"); + abort(); + } +} +void* wasm_rt_syscall_get_segue_base() { + void* base; + if (syscall(SYS_arch_prctl, ARCH_GET_GS, &base) != 0) { + perror("wasm_rt_syscall_get_segue_base error"); + abort(); + } + return base; +} +#endif + // Include table operations for funcref #define WASM_RT_TABLE_OPS_FUNCREF #include "wasm-rt-impl-tableops.inc" |