/* SPDX-License-Identifier: GPL-2.0 */ /* * GCC stack protector support. * * Stack protector works by putting predefined pattern at the start of * the stack frame and verifying that it hasn't been overwritten when * returning from the function. The pattern is called stack canary and * on LoongArch gcc expects it to be defined by a global variable called * "__stack_chk_guard". */ #ifndef _ASM_STACKPROTECTOR_H #define _ASM_STACKPROTECTOR_H extern unsigned long __stack_chk_guard; /* * Initialize the stackprotector canary value. * * NOTE: this must only be called from functions that never return, * and it must always be inlined. */ static __always_inline void boot_init_stack_canary(void) { unsigned long canary = get_random_canary(); current->stack_canary = canary; __stack_chk_guard = current->stack_canary; } #endif /* _ASM_STACKPROTECTOR_H */