47 #include <asm/text-patching.h>
62 #include <asm/insn-eval.h>
68 #include <asm/processor-flags.h>
77 	if (regs->flags & X86_EFLAGS_IF)  in cond_local_irq_enable()
83 	if (regs->flags & X86_EFLAGS_IF)  in cond_local_irq_disable()
117 		tsk->thread.error_code = error_code;  in do_trap_no_signal()
118 		tsk->thread.trap_nr = trapnr;  in do_trap_no_signal()
131 	tsk->thread.error_code = error_code;  in do_trap_no_signal()
132 	tsk->thread.trap_nr = trapnr;  in do_trap_no_signal()
134 	return -1;  in do_trap_no_signal()
144 			tsk->comm, task_pid_nr(tsk), type, desc,  in show_signal()
145 			regs->ip, regs->sp, error_code);  in show_signal()
146 		print_vma_addr(KERN_CONT " in ", regs->ip);  in show_signal()
186  * This address is usually regs->ip, but when an uprobe moved the code out
187  * of line then regs->ip points to the XOL code which would confuse
189  * a trap happened in XOL code then uprobe maps regs->ip back to the
222 	if (!is_valid_bugaddr(regs->ip))  in handle_bug()
233 	if (regs->flags & X86_EFLAGS_IF)  in handle_bug()
235 	if (report_bug(regs->ip, regs) == BUG_TRAP_TYPE_WARN) {  in handle_bug()
236 		regs->ip += LEN_UD2;  in handle_bug()
239 	if (regs->flags & X86_EFLAGS_IF)  in handle_bug()
317 		 (void *)fault_address, current->stack,  in handle_stack_overflow()
318 		 (char *)current->stack + THREAD_SIZE - 1);  in handle_stack_overflow()
335  * while the stack is read-only are, in fact, recoverable.
358 	 * If IRET takes a non-IST fault on the espfix64 stack, then we  in DEFINE_IDTENTRY_DF()
371 	if (((long)regs->sp >> P4D_SHIFT) == ESPFIX_PGD_ENTRY &&  in DEFINE_IDTENTRY_DF()
372 		regs->cs == __KERNEL_CS &&  in DEFINE_IDTENTRY_DF()
373 		regs->ip == (unsigned long)native_irq_return_iret)  in DEFINE_IDTENTRY_DF()
375 		struct pt_regs *gpregs = (struct pt_regs *)this_cpu_read(cpu_tss_rw.x86_tss.sp0) - 1;  in DEFINE_IDTENTRY_DF()
376 		unsigned long *p = (unsigned long *)regs->sp;  in DEFINE_IDTENTRY_DF()
379 		 * regs->sp points to the failing IRET frame on the  in DEFINE_IDTENTRY_DF()
381 		 * in gpregs->ss through gpregs->ip.  in DEFINE_IDTENTRY_DF()
384 		gpregs->ip	= p[0];  in DEFINE_IDTENTRY_DF()
385 		gpregs->cs	= p[1];  in DEFINE_IDTENTRY_DF()
386 		gpregs->flags	= p[2];  in DEFINE_IDTENTRY_DF()
387 		gpregs->sp	= p[3];  in DEFINE_IDTENTRY_DF()
388 		gpregs->ss	= p[4];  in DEFINE_IDTENTRY_DF()
389 		gpregs->orig_ax = 0;  /* Missing (lost) #GP error code */  in DEFINE_IDTENTRY_DF()
402 		regs->ip = (unsigned long)asm_exc_general_protection;  in DEFINE_IDTENTRY_DF()
403 		regs->sp = (unsigned long)&gpregs->orig_ax;  in DEFINE_IDTENTRY_DF()
413 	tsk->thread.error_code = error_code;  in DEFINE_IDTENTRY_DF()
414 	tsk->thread.trap_nr = X86_TRAP_DF;  in DEFINE_IDTENTRY_DF()
420 	 * take any non-IST exception while too close to the bottom of  in DEFINE_IDTENTRY_DF()
424 	 * According to the SDM (footnote in 6.15 under "Interrupt 14 -  in DEFINE_IDTENTRY_DF()
425 	 * Page-Fault Exception (#PF):  in DEFINE_IDTENTRY_DF()
454 	if ((unsigned long)task_stack_page(tsk) - 1 - address < PAGE_SIZE) {  in DEFINE_IDTENTRY_DF()
455 		handle_stack_overflow("kernel stack overflow (double-fault)",  in DEFINE_IDTENTRY_DF()
490  * out whether any part of the access to that address was non-canonical.
498 	if (copy_from_kernel_nofault(insn_buf, (void *)regs->ip,  in get_kernel_gp_address()
507 	if (*addr == -1UL)  in get_kernel_gp_address()
513 	 *  - the operand is not in the kernel half  in get_kernel_gp_address()
514 	 *  - the last byte of the operand is not in the user canonical half  in get_kernel_gp_address()
517 	    *addr + insn.opnd_bytes - 1 > __VIRTUAL_MASK)  in get_kernel_gp_address()
528 	struct thread_struct *t = &current->thread;  in fixup_iopl_exception()
532 	if (!IS_ENABLED(CONFIG_X86_IOPL_IOPERM) || t->iopl_emul != 3)  in fixup_iopl_exception()
545 	if (!t->iopl_warn && printk_ratelimit()) {  in fixup_iopl_exception()
547 		       current->comm, task_pid_nr(current), ip);  in fixup_iopl_exception()
550 		t->iopl_warn = 1;  in fixup_iopl_exception()
553 	regs->ip += 1;  in fixup_iopl_exception()
585 		tsk->thread.error_code = error_code;  in DEFINE_IDTENTRY_ERRORCODE()
586 		tsk->thread.trap_nr = X86_TRAP_GP;  in DEFINE_IDTENTRY_ERRORCODE()
596 	tsk->thread.error_code = error_code;  in DEFINE_IDTENTRY_ERRORCODE()
597 	tsk->thread.trap_nr = X86_TRAP_GP;  in DEFINE_IDTENTRY_ERRORCODE()
601 	 * from kprobe_running(), we have to be non-preemptible.  in DEFINE_IDTENTRY_ERRORCODE()
613 		snprintf(desc, sizeof(desc), "segment-related " GPFSTR);  in DEFINE_IDTENTRY_ERRORCODE()
619 			 (hint == GP_NON_CANONICAL) ? "probably for non-canonical address"  in DEFINE_IDTENTRY_ERRORCODE()
624 	 * KASAN is interested only in the non-canonical case, clear it  in DEFINE_IDTENTRY_ERRORCODE()
702  * Help handler running on a per-cpu (IST or entry trampoline) stack
708 	struct pt_regs *regs = (struct pt_regs *)this_cpu_read(cpu_current_top_of_stack) - 1;  in sync_regs()
722 	 * In the SYSCALL entry path the RSP value comes from user-space - don't  in vc_switch_off_ist()
733 	 * use the fall-back stack instead in this case.  in vc_switch_off_ist()
735 	sp    = regs->sp;  in vc_switch_off_ist()
744 	 * Found a safe stack - switch to it as if the entry didn't happen via  in vc_switch_off_ist()
748 	sp = ALIGN_DOWN(sp, 8) - sizeof(*regs_ret);  in vc_switch_off_ist()
774 		(struct bad_iret_stack *)__this_cpu_read(cpu_tss_rw.x86_tss.sp0) - 1;  in fixup_bad_iret()
777 	__memcpy(&tmp.regs.ip, (void *)s->regs.sp, 5*8);  in fixup_bad_iret()
785 	BUG_ON(!user_mode(&new_stack->regs));  in fixup_bad_iret()
794 	 * code that can be single-stepped in the SYSENTER entry path, then  in is_sysenter_singlestep()
795 	 * assume that this is a useless single-step trap due to SYSENTER  in is_sysenter_singlestep()
801 	return (regs->ip - (unsigned long)__begin_SYSENTER_singlestep_region) <  in is_sysenter_singlestep()
802 		(unsigned long)__end_SYSENTER_singlestep_region -  in is_sysenter_singlestep()
805 	return (regs->ip - (unsigned long)entry_SYSENTER_compat) <  in is_sysenter_singlestep()
806 		(unsigned long)__end_entry_SYSENTER_compat -  in is_sysenter_singlestep()
820 	 *   Certain debug exceptions may clear bits 0-3. The remaining  in debug_read_clear_dr6()
836  * Our handling of the processor debug registers is non-trivial.
840  * only set watchpoints on userspace addresses. Therefore the in-kernel
864 	 * consumed - hw_breakpoint_handler(), single_stop_cont().  in notify_debug()
867 	 * for signals - ptrace_triggered(), kgdb_hw_overflow_handler().  in notify_debug()
903 		 * it for userspace, but we just took a kernel #DB, so re-set  in exc_debug_kernel()
930 	 * The kernel doesn't use TF single-step outside of:  in exc_debug_kernel()
932 	 *  - Kprobes, consumed through kprobe_debug_handler()  in exc_debug_kernel()
933 	 *  - KGDB, consumed through notify_debug()  in exc_debug_kernel()
941 		regs->flags &= ~X86_EFLAGS_TF;  in exc_debug_kernel()
979 	current->thread.virtual_dr6 = (dr6 & DR_STEP);  in exc_debug_user()
1006 	/* Add the virtual_dr6 bits for signals. */  in exc_debug_user()
1007 	dr6 |= current->thread.virtual_dr6;  in exc_debug_user()
1051 	struct fpu *fpu = &task->thread.fpu;  in math_error()
1062 		task->thread.error_code = 0;  in math_error()
1063 		task->thread.trap_nr = trapnr;  in math_error()
1076 	task->thread.trap_nr	= trapnr;  in math_error()
1077 	task->thread.error_code = 0;  in math_error()
1112 	 * PROBLEM: If the APIC subsystem is configured in mixed mode with  in DEFINE_IDTENTRY()
1155 		 * to kill the task than getting stuck in a never-ending  in DEFINE_IDTENTRY()
1180 	/* Init GHCB memory pages when running as an SEV-ES guest */  in trap_init()