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/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * Copyright (C) 2016 Imagination Technologies * Author: Paul Burton <paul.burton@mips.com> */ #ifndef __MIPS_ASM_DSEMUL_H__ #define __MIPS_ASM_DSEMUL_H__ #include <asm/break.h> #include <asm/inst.h> /* Break instruction with special math emu break code set */ #define BREAK_MATH(micromips) (((micromips) ? 0x7 : 0xd) | (BRK_MEMU << 16)) /* When used as a frame index, indicates the lack of a frame */ #define BD_EMUFRAME_NONE ((int)BIT(31)) struct mm_struct; struct pt_regs; struct task_struct; /** * mips_dsemul() - 'Emulate' an instruction from a branch delay slot * @regs: User thread register context. * @ir: The instruction to be 'emulated'. * @branch_pc: The PC of the branch instruction. * @cont_pc: The PC to continue at following 'emulation'. * * Emulate or execute an arbitrary MIPS instruction within the context of * the current user thread. This is used primarily to handle instructions * in the delay slots of emulated branch instructions, for example FP * branch instructions on systems without an FPU. * * Return: Zero on success, negative if ir is a NOP, signal number on failure. */ extern int mips_dsemul(struct pt_regs *regs, mips_instruction ir, unsigned long branch_pc, unsigned long cont_pc); /** * do_dsemulret() - Return from a delay slot 'emulation' frame * @xcp: User thread register context. * * Call in response to the BRK_MEMU break instruction used to return to * the kernel from branch delay slot 'emulation' frames following a call * to mips_dsemul(). Restores the user thread PC to the value that was * passed as the cpc parameter to mips_dsemul(). * * Return: True if an emulation frame was returned from, else false. */ #ifdef CONFIG_MIPS_FP_SUPPORT extern bool do_dsemulret(struct pt_regs *xcp); #else static inline bool do_dsemulret(struct pt_regs *xcp) { return false; } #endif /** * dsemul_thread_cleanup() - Cleanup thread 'emulation' frame * @tsk: The task structure associated with the thread * * If the thread @tsk has a branch delay slot 'emulation' frame * allocated to it then free that frame. * * Return: True if a frame was freed, else false. */ #ifdef CONFIG_MIPS_FP_SUPPORT extern bool dsemul_thread_cleanup(struct task_struct *tsk); #else static inline bool dsemul_thread_cleanup(struct task_struct *tsk) { return false; } #endif /** * dsemul_thread_rollback() - Rollback from an 'emulation' frame * @regs: User thread register context. * * If the current thread, whose register context is represented by @regs, * is executing within a delay slot 'emulation' frame then exit that * frame. The PC will be rolled back to the branch if the instruction * that was being 'emulated' has not yet executed, or advanced to the * continuation PC if it has. * * Return: True if a frame was exited, else false. */ #ifdef CONFIG_MIPS_FP_SUPPORT extern bool dsemul_thread_rollback(struct pt_regs *regs); #else static inline bool dsemul_thread_rollback(struct pt_regs *regs) { return false; } #endif /** * dsemul_mm_cleanup() - Cleanup per-mm delay slot 'emulation' state * @mm: The struct mm_struct to cleanup state for. * * Cleanup state for the given @mm, ensuring that any memory allocated * for delay slot 'emulation' book-keeping is freed. This is to be called * before @mm is freed in order to avoid memory leaks. */ #ifdef CONFIG_MIPS_FP_SUPPORT extern void dsemul_mm_cleanup(struct mm_struct *mm); #else static inline void dsemul_mm_cleanup(struct mm_struct *mm) { /* no-op */ } #endif #endif /* __MIPS_ASM_DSEMUL_H__ */
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