litmus-rt-ext-res.git - LITMUS^RT with extended reservations for Forbidden Zones paper @ RTAS'20

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/*
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 */

/*
 * entry.S contains the system-call and fault low-level handling routines.
 * This also contains the timer-interrupt handler, as well as all interrupts
 * and faults that can result in a task-switch.
 *
 * NOTE: This code handles signal-recognition, which happens every time
 * after a timer-interrupt and after each system call.
 *
 * I changed all the .align's to 4 (16 byte alignment), as that's faster
 * on a 486.
 *
 * Stack layout in 'syscall_exit':
 * 	ptrace needs to have all regs on the stack.
 *	if the order here is changed, it needs to be
 *	updated in fork.c:copy_process, signal.c:do_signal,
 *	ptrace.c and ptrace.h
 *
 *	 0(%esp) - %ebx
 *	 4(%esp) - %ecx
 *	 8(%esp) - %edx
 *       C(%esp) - %esi
 *	10(%esp) - %edi
 *	14(%esp) - %ebp
 *	18(%esp) - %eax
 *	1C(%esp) - %ds
 *	20(%esp) - %es
 *	24(%esp) - %fs
 *	28(%esp) - orig_eax
 *	2C(%esp) - %eip
 *	30(%esp) - %cs
 *	34(%esp) - %eflags
 *	38(%esp) - %oldesp
 *	3C(%esp) - %oldss
 *
 * "current" is in register %ebx during any slow entries.
 */

#include <linux/linkage.h>
#include <asm/thread_info.h>
#include <asm/irqflags.h>
#include <asm/errno.h>
#include <asm/segment.h>
#include <asm/smp.h>
#include <asm/page.h>
#include <asm/desc.h>
#include <asm/percpu.h>
#include <asm/dwarf2.h>
#include <asm/processor-flags.h>
#include <asm/ftrace.h>
#include <asm/irq_vectors.h>

/* Avoid __ASSEMBLER__'ifying <linux/audit.h> just for this.  */
#include <linux/elf-em.h>
#define AUDIT_ARCH_I386		(EM_386|__AUDIT_ARCH_LE)
#define __AUDIT_ARCH_LE	   0x40000000

#ifndef CONFIG_AUDITSYSCALL
#define sysenter_audit	syscall_trace_entry
#define sysexit_audit	syscall_exit_work
#endif

/*
 * We use macros for low-level operations which need to be overridden
 * for paravirtualization.  The following will never clobber any registers:
 *   INTERRUPT_RETURN (aka. "iret")
 *   GET_CR0_INTO_EAX (aka. "movl %cr0, %eax")
 *   ENABLE_INTERRUPTS_SYSEXIT (aka "sti; sysexit").
 *
 * For DISABLE_INTERRUPTS/ENABLE_INTERRUPTS (aka "cli"/"sti"), you must
 * specify what registers can be overwritten (CLBR_NONE, CLBR_EAX/EDX/ECX/ANY).
 * Allowing a register to be clobbered can shrink the paravirt replacement
 * enough to patch inline, increasing performance.
 */

#define nr_syscalls ((syscall_table_size)/4)

#ifdef CONFIG_PREEMPT
#define preempt_stop(clobbers)	DISABLE_INTERRUPTS(clobbers); TRACE_IRQS_OFF
#else
#define preempt_stop(clobbers)
#define resume_kernel		restore_nocheck
#endif

.macro TRACE_IRQS_IRET
#ifdef CONFIG_TRACE_IRQFLAGS
	testl $X86_EFLAGS_IF,PT_EFLAGS(%esp)     # interrupts off?
	jz 1f
	TRACE_IRQS_ON
1:
#endif
.endm

#ifdef CONFIG_VM86
#define resume_userspace_sig	check_userspace
#else
#define resume_userspace_sig	resume_userspace
#endif

#define SAVE_ALL \
	cld; \
	pushl %fs; \
	CFI_ADJUST_CFA_OFFSET 4;\
	/*CFI_REL_OFFSET fs, 0;*/\
	pushl %es; \
	CFI_ADJUST_CFA_OFFSET 4;\
	/*CFI_REL_OFFSET es, 0;*/\
	pushl %ds; \
	CFI_ADJUST_CFA_OFFSET 4;\
	/*CFI_REL_OFFSET ds, 0;*/\
	pushl %eax; \
	CFI_ADJUST_CFA_OFFSET 4;\
	CFI_REL_OFFSET eax, 0;\
	pushl %ebp; \
	CFI_ADJUST_CFA_OFFSET 4;\
	CFI_REL_OFFSET ebp, 0;\
	pushl %edi; \
	CFI_ADJUST_CFA_OFFSET 4;\
	CFI_REL_OFFSET edi, 0;\
	pushl %esi; \
	CFI_ADJUST_CFA_OFFSET 4;\
	CFI_REL_OFFSET esi, 0;\
	pushl %edx; \
	CFI_ADJUST_CFA_OFFSET 4;\
	CFI_REL_OFFSET edx, 0;\
	pushl %ecx; \
	CFI_ADJUST_CFA_OFFSET 4;\
	CFI_REL_OFFSET ecx, 0;\
	pushl %ebx; \
	CFI_ADJUST_CFA_OFFSET 4;\
	CFI_REL_OFFSET ebx, 0;\
	movl $(__USER_DS), %edx; \
	movl %edx, %ds; \
	movl %edx, %es; \
	movl $(__KERNEL_PERCPU), %edx; \
	movl %edx, %fs

#define RESTORE_INT_REGS \
	popl %ebx;	\
	CFI_ADJUST_CFA_OFFSET -4;\
	CFI_RESTORE ebx;\
	popl %ecx;	\
	CFI_ADJUST_CFA_OFFSET -4;\
	CFI_RESTORE ecx;\
	popl %edx;	\
	CFI_ADJUST_CFA_OFFSET -4;\
	CFI_RESTORE edx;\
	popl %esi;	\
	CFI_ADJUST_CFA_OFFSET -4;\
	CFI_RESTORE esi;\
	popl %edi;	\
	CFI_ADJUST_CFA_OFFSET -4;\
	CFI_RESTORE edi;\
	popl %ebp;	\
	CFI_ADJUST_CFA_OFFSET -4;\
	CFI_RESTORE ebp;\
	popl %eax;	\
	CFI_ADJUST_CFA_OFFSET -4;\
	CFI_RESTORE eax

#define RESTORE_REGS	\
	RESTORE_INT_REGS; \
1:	popl %ds;	\
	CFI_ADJUST_CFA_OFFSET -4;\
	/*CFI_RESTORE ds;*/\
2:	popl %es;	\
	CFI_ADJUST_CFA_OFFSET -4;\
	/*CFI_RESTORE es;*/\
3:	popl %fs;	\
	CFI_ADJUST_CFA_OFFSET -4;\
	/*CFI_RESTORE fs;*/\
.pushsection .fixup,"ax";	\
4:	movl $0,(%esp);	\
	jmp 1b;		\
5:	movl $0,(%esp);	\
	jmp 2b;		\
6:	movl $0,(%esp);	\
	jmp 3b;		\
.section __ex_table,"a";\
	.align 4;	\
	.long 1b,4b;	\
	.long 2b,5b;	\
	.long 3b,6b;	\
.popsection

#define RING0_INT_FRAME \
	CFI_STARTPROC simple;\
	CFI_SIGNAL_FRAME;\
	CFI_DEF_CFA esp, 3*4;\
	/*CFI_OFFSET cs, -2*4;*/\
	CFI_OFFSET eip, -3*4

#define RING0_EC_FRAME \
	CFI_STARTPROC simple;\
	CFI_SIGNAL_FRAME;\
	CFI_DEF_CFA esp, 4*4;\
	/*CFI_OFFSET cs, -2*4;*/\
	CFI_OFFSET eip, -3*4

#define RING0_PTREGS_FRAME \
	CFI_STARTPROC simple;\
	CFI_SIGNAL_FRAME;\
	CFI_DEF_CFA esp, PT_OLDESP-PT_EBX;\
	/*CFI_OFFSET cs, PT_CS-PT_OLDESP;*/\
	CFI_OFFSET eip, PT_EIP-PT_OLDESP;\
	/*CFI_OFFSET es, PT_ES-PT_OLDESP;*/\
	/*CFI_OFFSET ds, PT_DS-PT_OLDESP;*/\
	CFI_OFFSET eax, PT_EAX-PT_OLDESP;\
	CFI_OFFSET ebp, PT_EBP-PT_OLDESP;\
	CFI_OFFSET edi, PT_EDI-PT_OLDESP;\
	CFI_OFFSET esi, PT_ESI-PT_OLDESP;\
	CFI_OFFSET edx, PT_EDX-PT_OLDESP;\
	CFI_OFFSET ecx, PT_ECX-PT_OLDESP;\
	CFI_OFFSET ebx, PT_EBX-PT_OLDESP

ENTRY(ret_from_fork)
	CFI_STARTPROC
	pushl %eax
	CFI_ADJUST_CFA_OFFSET 4
	call schedule_tail
	GET_THREAD_INFO(%ebp)
	popl %eax
	CFI_ADJUST_CFA_OFFSET -4
	pushl $0x0202			# Reset kernel eflags
	CFI_ADJUST_CFA_OFFSET 4
	popfl
	CFI_ADJUST_CFA_OFFSET -4
	jmp syscall_exit
	CFI_ENDPROC
END(ret_from_fork)

/*
 * Return to user mode is not as complex as all this looks,
 * but we want the default path for a system call return to
 * go as quickly as possible which is why some of this is
 * less clear than it otherwise should be.
 */

	# userspace resumption stub bypassing syscall exit tracing
	ALIGN
	RING0_PTREGS_FRAME
ret_from_exception:
	preempt_stop(CLBR_ANY)
ret_from_intr:
	GET_THREAD_INFO(%ebp)
check_userspace:
	movl PT_EFLAGS(%esp), %eax	# mix EFLAGS and CS
	movb PT_CS(%esp), %al
	andl $(X86_EFLAGS_VM | SEGMENT_RPL_MASK), %eax
	cmpl $USER_RPL, %eax
	jb resume_kernel		# not returning to v8086 or userspace

ENTRY(resume_userspace)
	LOCKDEP_SYS_EXIT
 	DISABLE_INTERRUPTS(CLBR_ANY)	# make sure we don't miss an interrupt
					# setting need_resched or sigpending
					# between sampling and the iret
	TRACE_IRQS_OFF
	movl TI_flags(%ebp), %ecx
	andl $_TIF_WORK_MASK, %ecx	# is there any work to be done on
					# int/exception return?
	jne work_pending
	jmp restore_all
END(ret_from_exception)

#ifdef CONFIG_PREEMPT
ENTRY(resume_kernel)
	DISABLE_INTERRUPTS(CLBR_ANY)
	cmpl $0,TI_preempt_count(%ebp)	# non-zero preempt_count ?
	jnz restore_nocheck
need_resched:
	movl TI_flags(%ebp), %ecx	# need_resched set ?
	testb $_TIF_NEED_RESCHED, %cl
	jz restore_all
	testl $X86_EFLAGS_IF,PT_EFLAGS(%esp)	# interrupts off (exception path) ?
	jz restore_all
	call preempt_schedule_irq
	jmp need_resched
END(resume_kernel)
#endif
	CFI_ENDPROC

/* SYSENTER_RETURN points to after the "sysenter" instruction in
   the vsyscall page.  See vsyscall-sysentry.S, which defines the symbol.  */

	# sysenter call handler stub
ENTRY(ia32_sysenter_target)
	CFI_STARTPROC simple
	CFI_SIGNAL_FRAME
	CFI_DEF_CFA esp, 0
	CFI_REGISTER esp, ebp
	movl TSS_sysenter_sp0(%esp),%esp
sysenter_past_esp:
	/*
	 * Interrupts are disabled here, but we can't trace it until
	 * enough kernel state to call TRACE_IRQS_OFF can be called - but
	 * we immediately enable interrupts at that point anyway.
	 */
	pushl $(__USER_DS)
	CFI_ADJUST_CFA_OFFSET 4
	/*CFI_REL_OFFSET ss, 0*/
	pushl %ebp
	CFI_ADJUST_CFA_OFFSET 4
	CFI_REL_OFFSET esp, 0
	pushfl
	orl $X86_EFLAGS_IF, (%esp)
	CFI_ADJUST_CFA_OFFSET 4
	pushl $(__USER_CS)
	CFI_ADJUST_CFA_OFFSET 4
	/*CFI_REL_OFFSET cs, 0*/
	/*
	 * Push current_thread_info()->sysenter_return to the stack.
	 * A tiny bit of offset fixup is necessary - 4*4 means the 4 words
	 * pushed above; +8 corresponds to copy_thread's esp0 setting.
	 */
	pushl (TI_sysenter_return-THREAD_SIZE+8+4*4)(%esp)
	CFI_ADJUST_CFA_OFFSET 4
	CFI_REL_OFFSET eip, 0

	pushl %eax
	CFI_ADJUST_CFA_OFFSET 4
	SAVE_ALL
	ENABLE_INTERRUPTS(CLBR_NONE)

/*
 * Load the potential sixth argument from user stack.
 * Careful about security.
 */
	cmpl $__PAGE_OFFSET-3,%ebp
	jae syscall_fault
1:	movl (%ebp),%ebp
	movl %ebp,PT_EBP(%esp)
.section __ex_table,"a"
	.align 4
	.long 1b,syscall_fault
.previous

	GET_THREAD_INFO(%ebp)

	/* Note, _TIF_SECCOMP is bit number 8, and so it needs testw and not testb */
	testw $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%ebp)
	jnz sysenter_audit
sysenter_do_call:
	cmpl $(nr_syscalls), %eax
	jae syscall_badsys
	call *sys_call_table(,%eax,4)
	movl %eax,PT_EAX(%esp)
	LOCKDEP_SYS_EXIT
	DISABLE_INTERRUPTS(CLBR_ANY)
	TRACE_IRQS_OFF
	movl TI_flags(%ebp), %ecx
	testw $_TIF_ALLWORK_MASK, %cx
	jne sysexit_audit
sysenter_exit:
/* if something modifies registers it must also disable sysexit */
	movl PT_EIP(%esp), %edx
	movl PT_OLDESP(%esp), %ecx
	xorl %ebp,%ebp
	TRACE_IRQS_ON
1:	mov  PT_FS(%esp), %fs
	ENABLE_INTERRUPTS_SYSEXIT

#ifdef CONFIG_AUDITSYSCALL
sysenter_audit:
	testw $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT),TI_flags(%ebp)
	jnz syscall_trace_entry
	addl $4,%esp
	CFI_ADJUST_CFA_OFFSET -4
	/* %esi already in 8(%esp)	   6th arg: 4th syscall arg */
	/* %edx already in 4(%esp)	   5th arg: 3rd syscall arg */
	/* %ecx already in 0(%esp)	   4th arg: 2nd syscall arg */
	movl %ebx,%ecx			/* 3rd arg: 1st syscall arg */
	movl %eax,%edx			/* 2nd arg: syscall number */


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