From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934058Ab1IJUh3 (ORCPT ); Sat, 10 Sep 2011 16:37:29 -0400 Received: from zfrontend2.aha.ru ([195.2.83.148]:50714 "EHLO aha.ru" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S933495Ab1IJUhZ (ORCPT ); Sat, 10 Sep 2011 16:37:25 -0400 From: "werner" Subject: 3.1-rc5 dont boot To: linux-kernel@vger.kernel.org, torvalds@linux-foundation.org, yong.zhang0@gmail.com X-Mailer: CommuniGate Pro WebUser Interface v.4.3.12 Date: Sat, 10 Sep 2011 16:37:15 -0400 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8"; format="flowed" Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Meanwhile someone mailed me the patch, and I applied it to the code, i.e. entry_32.S . Please verify below that I patched it right. Compiling everything, during booting it sticks and stops again, as before, but now some of the last error messages on the screen changed. This means that the patch is really near the problem. Below I indicated the CHANGES what happens now (probably by the patch) at the last error messages. Perhaps this permits to find the problem. The problem is the same, no matter if I start the computer normally, or using an initrd. W.Landgraf ==================== c1024274 no_context+0xbf/0xc7 c1024409 _bad_area_nosemaphore+0x18d/0x198 c10a7fb4 ? get_page_from_freelist+0x24b/0x293 c10a5a07 ? __zone_watermark_ok+0xe/0x91 c10a7c79 ? prep_new_page+0xe/0xfe c10a7fb4 ? get_page_from_freelist+0x24b/0x293 c1f35cca ? raw_spin_lock_irqsave+0x1d/0x3a c102442b bad_area_nosemaphore+0x17/0x19 c102472e do-page_fault+0x157/0x346 c1f35d26 ? _raw_spin-unlock_irqrestore+0x16/0x18 c15e2ef1 ? vgacon_scroll+0x29d/0x2bd c1021e14 ? native_irq_disable+0x8/0xb new added: c1f35cca ? __raw_spin_lock_irqsave+0x1d/0x3a new added: c1f35d26 ? __raw_spin_unlock_irqrestore+0x16/0x18 unchanged: c1008d10 ? native_io_delay+0x8/0x30 unchanged: c15e1b5c ? vgacon_set_curser_size+0xf7/0xfe unchanged: c105a54e ? notifier_call_chain+0xe/0x4f unchanged: c105a5d7 ? atomic_notifier_call_chain+0x22/0x24 old: c102468b ? mm_fault_error+0xcb/0xcb new instead: c16c011c ? notify-update+0x27/0x29 unchanged: c1f3be37 error_code+0x67/0x70 new added: c100a967 ? xstateregs_set+0xd3 / 0xdb old: c1007396 ? apply_alternatives+0xaf/0x167 new instead: c1007366 ? apply_alternatives+0x7f/0x167 new added: c1001d88 ? lazy_hcall1+0x8a/0xc1 c10a7fb4 ? get_page_from_freelist+0x24b/0x293 c10a84cb ? __alloc_pages_nodemask+0x104/0x5de c24fd18d ? relocate_vdso+0x1b/0x266 c24ef501 alternative_instructions+0x1a/0x10e c1021e5a ? native-write_cro+0x8/0xd c24f065c check_bugs+0x155/0x15a c1087094 ? delayacct_init+0x50/0x54 c24e880a start_kernel+0x322/0x337 c24e82fe ? kernel_init+0x116/0x116 c24e80ac i386_start_kernel+0xac/0xb3 ========== hopefully correctly patched subroutine: /* * * 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) - %gs saved iff !CONFIG_X86_32_LAZY_GS * 2C(%esp) - orig_eax * 30(%esp) - %eip * 34(%esp) - %cs * 38(%esp) - %eflags * 3C(%esp) - %oldesp * 40(%esp) - %oldss * * "current" is in register %ebx during any slow entries. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* Avoid __ASSEMBLER__'ifying just for this. */ #include #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 .section .entry.text, "ax" /* * 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_all #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 /* * User gs save/restore * * %gs is used for userland TLS and kernel only uses it for stack * canary which is required to be at %gs:20 by gcc. Read the comment * at the top of stackprotector.h for more info. * * Local labels 98 and 99 are used. */ #ifdef CONFIG_X86_32_LAZY_GS /* unfortunately push/pop can't be no-op */ .macro PUSH_GS pushl_cfi $0 .endm .macro POP_GS pop=0 addl $(4 + \pop), %esp CFI_ADJUST_CFA_OFFSET -(4 + \pop) .endm .macro POP_GS_EX .endm /* all the rest are no-op */ .macro PTGS_TO_GS .endm .macro PTGS_TO_GS_EX .endm .macro GS_TO_REG reg .endm .macro REG_TO_PTGS reg .endm .macro SET_KERNEL_GS reg .endm #else /* CONFIG_X86_32_LAZY_GS */ .macro PUSH_GS pushl_cfi %gs /*CFI_REL_OFFSET gs, 0*/ .endm .macro POP_GS pop=0 98: popl_cfi %gs /*CFI_RESTORE gs*/ .if \pop <> 0 add $\pop, %esp CFI_ADJUST_CFA_OFFSET -\pop .endif .endm .macro POP_GS_EX .pushsection .fixup, "ax" 99: movl $0, (%esp) jmp 98b .section __ex_table, "a" .align 4 .long 98b, 99b .popsection .endm .macro PTGS_TO_GS 98: mov PT_GS(%esp), %gs .endm .macro PTGS_TO_GS_EX .pushsection .fixup, "ax" 99: movl $0, PT_GS(%esp) jmp 98b .section __ex_table, "a" .align 4 .long 98b, 99b .popsection .endm .macro GS_TO_REG reg movl %gs, \reg /*CFI_REGISTER gs, \reg*/ .endm .macro REG_TO_PTGS reg movl \reg, PT_GS(%esp) /*CFI_REL_OFFSET gs, PT_GS*/ .endm .macro SET_KERNEL_GS reg movl $(__KERNEL_STACK_CANARY), \reg movl \reg, %gs .endm #endif /* CONFIG_X86_32_LAZY_GS */ .macro SAVE_ALL cld PUSH_GS pushl_cfi %fs /*CFI_REL_OFFSET fs, 0;*/ pushl_cfi %es /*CFI_REL_OFFSET es, 0;*/ pushl_cfi %ds /*CFI_REL_OFFSET ds, 0;*/ pushl_cfi %eax CFI_REL_OFFSET eax, 0 pushl_cfi %ebp CFI_REL_OFFSET ebp, 0 pushl_cfi %edi CFI_REL_OFFSET edi, 0 pushl_cfi %esi CFI_REL_OFFSET esi, 0 pushl_cfi %edx CFI_REL_OFFSET edx, 0 pushl_cfi %ecx CFI_REL_OFFSET ecx, 0 pushl_cfi %ebx CFI_REL_OFFSET ebx, 0 movl $(__USER_DS), %edx movl %edx, %ds movl %edx, %es movl $(__KERNEL_PERCPU), %edx movl %edx, %fs SET_KERNEL_GS %edx .endm .macro RESTORE_INT_REGS popl_cfi %ebx CFI_RESTORE ebx popl_cfi %ecx CFI_RESTORE ecx popl_cfi %edx CFI_RESTORE edx popl_cfi %esi CFI_RESTORE esi popl_cfi %edi CFI_RESTORE edi popl_cfi %ebp CFI_RESTORE ebp popl_cfi %eax CFI_RESTORE eax .endm .macro RESTORE_REGS pop=0 RESTORE_INT_REGS 1: popl_cfi %ds /*CFI_RESTORE ds;*/ 2: popl_cfi %es /*CFI_RESTORE es;*/ 3: popl_cfi %fs /*CFI_RESTORE fs;*/ POP_GS \pop .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 POP_GS_EX .endm .macro 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 .endm .macro 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 .endm .macro 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 .endm ENTRY(ret_from_fork) CFI_STARTPROC pushl_cfi %eax call schedule_tail GET_THREAD_INFO(%ebp) popl_cfi %eax pushl_cfi $0x0202 # Reset kernel eflags popfl_cfi jmp syscall_exit CFI_ENDPROC END(ret_from_fork) /* * Interrupt exit functions should be protected against kprobes */ .pushsection .kprobes.text, "ax" /* * 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_all 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 /* * End of kprobes section */ .popsection /* 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_cfi $__USER_DS /*CFI_REL_OFFSET ss, 0*/ pushl_cfi %ebp CFI_REL_OFFSET esp, 0 pushfl_cfi orl $X86_EFLAGS_IF, (%esp) pushl_cfi $__USER_CS /*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_cfi ((TI_sysenter_return)-THREAD_SIZE+8+4*4)(%esp) CFI_REL_OFFSET eip, 0 pushl_cfi %eax 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) testl $_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 testl $_TIF_ALLWORK_MASK, %ecx 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 PTGS_TO_GS ENABLE_INTERRUPTS_SYSEXIT #ifdef CONFIG_AUDITSYSCALL sysenter_audit: testl $(_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 */ movl $AUDIT_ARCH_I386,%eax /* 1st arg: audit arch */ call audit_syscall_entry pushl_cfi %ebx movl PT_EAX(%esp),%eax /* reload syscall number */ jmp sysenter_do_call sysexit_audit: testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT), %ecx jne syscall_exit_work TRACE_IRQS_ON ENABLE_INTERRUPTS(CLBR_ANY) movl %eax,%edx /* second arg, syscall return value */ cmpl $0,%eax /* is it < 0? */ setl %al /* 1 if so, 0 if not */ movzbl %al,%eax /* zero-extend that */ inc %eax /* first arg, 0->1(AUDITSC_SUCCESS), 1->2(AUDITSC_FAILURE) */ call audit_syscall_exit DISABLE_INTERRUPTS(CLBR_ANY) TRACE_IRQS_OFF movl TI_flags(%ebp), %ecx testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT), %ecx jne syscall_exit_work movl PT_EAX(%esp),%eax /* reload syscall return value */ jmp sysenter_exit #endif CFI_ENDPROC .pushsection .fixup,"ax" 2: movl $0,PT_FS(%esp) jmp 1b .section __ex_table,"a" .align 4 .long 1b,2b .popsection PTGS_TO_GS_EX ENDPROC(ia32_sysenter_target) /* * syscall stub including irq exit should be protected against kprobes */ .pushsection .kprobes.text, "ax" # system call handler stub ENTRY(system_call) RING0_INT_FRAME # can't unwind into user space anyway pushl_cfi %eax # save orig_eax SAVE_ALL GET_THREAD_INFO(%ebp) # system call tracing in operation / emulation testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%ebp) jnz syscall_trace_entry cmpl $(nr_syscalls), %eax jae syscall_badsys syscall_call: call *sys_call_table(,%eax,4) movl %eax,PT_EAX(%esp) # store the return value syscall_exit: 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 testl $_TIF_ALLWORK_MASK, %ecx # current->work jne syscall_exit_work restore_all: TRACE_IRQS_IRET restore_all_notrace: movl PT_EFLAGS(%esp), %eax # mix EFLAGS, SS and CS # Warning: PT_OLDSS(%esp) contains the wrong/random values if we # are returning to the kernel. # See comments in process.c:copy_thread() for details. movb PT_OLDSS(%esp), %ah movb PT_CS(%esp), %al andl $(X86_EFLAGS_VM | (SEGMENT_TI_MASK << 8) | SEGMENT_RPL_MASK), %eax cmpl $((SEGMENT_LDT << 8) | USER_RPL), %eax CFI_REMEMBER_STATE je ldt_ss # returning to user-space with LDT SS restore_nocheck: RESTORE_REGS 4 # skip orig_eax/error_code irq_return: INTERRUPT_RETURN .section .fixup,"ax" ENTRY(iret_exc) pushl $0 # no error code pushl $do_iret_error jmp error_code .previous .section __ex_table,"a" .align 4 .long irq_return,iret_exc .previous CFI_RESTORE_STATE ldt_ss: larl PT_OLDSS(%esp), %eax jnz restore_nocheck testl $0x00400000, %eax # returning to 32bit stack? jnz restore_nocheck # allright, normal return #ifdef CONFIG_PARAVIRT /* * The kernel can't run on a non-flat stack if paravirt mode * is active. Rather than try to fixup the high bits of * ESP, bypass this code entirely. This may break DOSemu * and/or Wine support in a paravirt VM, although the option * is still available to implement the setting of the high * 16-bits in the INTERRUPT_RETURN paravirt-op. */ cmpl $0, pv_info+PARAVIRT_enabled jne restore_nocheck #endif /* * Setup and switch to ESPFIX stack * * We're returning to userspace with a 16 bit stack. The CPU will not * restore the high word of ESP for us on executing iret... This is an * "official" bug of all the x86-compatible CPUs, which we can work * around to make dosemu and wine happy. We do this by preloading the * high word of ESP with the high word of the userspace ESP while * compensating for the offset by changing to the ESPFIX segment with * a base address that matches for the difference. */ #define GDT_ESPFIX_SS PER_CPU_VAR(gdt_page) + (GDT_ENTRY_ESPFIX_SS * 8) mov %esp, %edx /* load kernel esp */ mov PT_OLDESP(%esp), %eax /* load userspace esp */ mov %dx, %ax /* eax: new kernel esp */ sub %eax, %edx /* offset (low word is 0) */ shr $16, %edx mov %dl, GDT_ESPFIX_SS + 4 /* bits 16..23 */ mov %dh, GDT_ESPFIX_SS + 7 /* bits 24..31 */ pushl_cfi $__ESPFIX_SS pushl_cfi %eax /* new kernel esp */ /* Disable interrupts, but do not irqtrace this section: we * will soon execute iret and the tracer was already set to * the irqstate after the iret */ DISABLE_INTERRUPTS(CLBR_EAX) lss (%esp), %esp /* switch to espfix segment */ CFI_ADJUST_CFA_OFFSET -8 jmp restore_nocheck CFI_ENDPROC ENDPROC(system_call) # perform work that needs to be done immediately before resumption ALIGN RING0_PTREGS_FRAME # can't unwind into user space anyway work_pending: testb $_TIF_NEED_RESCHED, %cl jz work_notifysig work_resched: call schedule 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 other # than syscall tracing? jz restore_all testb $_TIF_NEED_RESCHED, %cl jnz work_resched work_notifysig: # deal with pending signals and # notify-resume requests #ifdef CONFIG_VM86 testl $X86_EFLAGS_VM, PT_EFLAGS(%esp) movl %esp, %eax jne work_notifysig_v86 # returning to kernel-space or # vm86-space xorl %edx, %edx call do_notify_resume jmp resume_userspace_sig ALIGN work_notifysig_v86: pushl_cfi %ecx # save ti_flags for do_notify_resume call save_v86_state # %eax contains pt_regs pointer popl_cfi %ecx movl %eax, %esp #else movl %esp, %eax #endif xorl %edx, %edx call do_notify_resume jmp resume_userspace_sig END(work_pending) # perform syscall exit tracing ALIGN syscall_trace_entry: movl $-ENOSYS,PT_EAX(%esp) movl %esp, %eax call syscall_trace_enter /* What it returned is what we'll actually use. */ cmpl $(nr_syscalls), %eax jnae syscall_call jmp syscall_exit END(syscall_trace_entry) # perform syscall exit tracing ALIGN syscall_exit_work: testl $_TIF_WORK_SYSCALL_EXIT, %ecx jz work_pending TRACE_IRQS_ON ENABLE_INTERRUPTS(CLBR_ANY) # could let syscall_trace_leave() call # schedule() instead movl %esp, %eax call syscall_trace_leave jmp resume_userspace END(syscall_exit_work) CFI_ENDPROC RING0_INT_FRAME # can't unwind into user space anyway syscall_fault: GET_THREAD_INFO(%ebp) movl $-EFAULT,PT_EAX(%esp) jmp resume_userspace END(syscall_fault) syscall_badsys: movl $-ENOSYS,PT_EAX(%esp) jmp resume_userspace END(syscall_badsys) CFI_ENDPROC /* * End of kprobes section */ .popsection /* * System calls that need a pt_regs pointer. */ #define PTREGSCALL0(name) \ ALIGN; \ ptregs_##name: \ leal 4(%esp),%eax; \ jmp sys_##name; #define PTREGSCALL1(name) \ ALIGN; \ ptregs_##name: \ leal 4(%esp),%edx; \ movl (PT_EBX+4)(%esp),%eax; \ jmp sys_##name; #define PTREGSCALL2(name) \ ALIGN; \ ptregs_##name: \ leal 4(%esp),%ecx; \ movl (PT_ECX+4)(%esp),%edx; \ movl (PT_EBX+4)(%esp),%eax; \ jmp sys_##name; #define PTREGSCALL3(name) \ ALIGN; \ ptregs_##name: \ CFI_STARTPROC; \ leal 4(%esp),%eax; \ pushl_cfi %eax; \ movl PT_EDX(%eax),%ecx; \ movl PT_ECX(%eax),%edx; \ movl PT_EBX(%eax),%eax; \ call sys_##name; \ addl $4,%esp; \ CFI_ADJUST_CFA_OFFSET -4; \ ret; \ CFI_ENDPROC; \ ENDPROC(ptregs_##name) PTREGSCALL1(iopl) PTREGSCALL0(fork) PTREGSCALL0(vfork) PTREGSCALL3(execve) PTREGSCALL2(sigaltstack) PTREGSCALL0(sigreturn) PTREGSCALL0(rt_sigreturn) PTREGSCALL2(vm86) PTREGSCALL1(vm86old) /* Clone is an oddball. The 4th arg is in %edi */ ALIGN; ptregs_clone: CFI_STARTPROC leal 4(%esp),%eax pushl_cfi %eax pushl_cfi PT_EDI(%eax) movl PT_EDX(%eax),%ecx movl PT_ECX(%eax),%edx movl PT_EBX(%eax),%eax call sys_clone addl $8,%esp CFI_ADJUST_CFA_OFFSET -8 ret CFI_ENDPROC ENDPROC(ptregs_clone) .macro FIXUP_ESPFIX_STACK /* * Switch back for ESPFIX stack to the normal zerobased stack * * We can't call C functions using the ESPFIX stack. This code reads * the high word of the segment base from the GDT and swiches to the * normal stack and adjusts ESP with the matching offset. */ /* fixup the stack */ mov GDT_ESPFIX_SS + 4, %al /* bits 16..23 */ mov GDT_ESPFIX_SS + 7, %ah /* bits 24..31 */ shl $16, %eax addl %esp, %eax /* the adjusted stack pointer */ pushl_cfi $__KERNEL_DS pushl_cfi %eax lss (%esp), %esp /* switch to the normal stack segment */ CFI_ADJUST_CFA_OFFSET -8 .endm .macro UNWIND_ESPFIX_STACK movl %ss, %eax /* see if on espfix stack */ cmpw $__ESPFIX_SS, %ax jne 27f movl $__KERNEL_DS, %eax movl %eax, %ds movl %eax, %es /* switch to normal stack */ FIXUP_ESPFIX_STACK 27: .endm /* * Build the entry stubs and pointer table with some assembler magic. * We pack 7 stubs into a single 32-byte chunk, which will fit in a * single cache line on all modern x86 implementations. */ .section .init.rodata,"a" ENTRY(interrupt) .section .entry.text, "ax" .p2align 5 .p2align CONFIG_X86_L1_CACHE_SHIFT ENTRY(irq_entries_start) RING0_INT_FRAME vector=FIRST_EXTERNAL_VECTOR .rept (NR_VECTORS-FIRST_EXTERNAL_VECTOR+6)/7 .balign 32 .rept 7 .if vector < NR_VECTORS .if vector <> FIRST_EXTERNAL_VECTOR CFI_ADJUST_CFA_OFFSET -4 .endif 1: pushl_cfi $(~vector+0x80) /* Note: always in signed byte range */ .if ((vector-FIRST_EXTERNAL_VECTOR)%7) <> 6 jmp 2f .endif .previous .long 1b .section .entry.text, "ax" vector=vector+1 .endif .endr 2: jmp common_interrupt .endr END(irq_entries_start) .previous END(interrupt) .previous /* * the CPU automatically disables interrupts when executing an IRQ vector, * so IRQ-flags tracing has to follow that: */ .p2align CONFIG_X86_L1_CACHE_SHIFT common_interrupt: addl $-0x80,(%esp) /* Adjust vector into the [-256,-1] range */ SAVE_ALL TRACE_IRQS_OFF movl %esp,%eax call do_IRQ jmp ret_from_intr ENDPROC(common_interrupt) CFI_ENDPROC /* * Irq entries should be protected against kprobes */ .pushsection .kprobes.text, "ax" #define BUILD_INTERRUPT3(name, nr, fn) \ ENTRY(name) \ RING0_INT_FRAME; \ pushl_cfi $~(nr); \ SAVE_ALL; \ TRACE_IRQS_OFF \ movl %esp,%eax; \ call fn; \ jmp ret_from_intr; \ CFI_ENDPROC; \ ENDPROC(name) #define BUILD_INTERRUPT(name, nr) BUILD_INTERRUPT3(name, nr, smp_##name) /* The include is where all of the SMP etc. interrupts come from */ #include ENTRY(coprocessor_error) RING0_INT_FRAME pushl_cfi $0 pushl_cfi $do_coprocessor_error jmp error_code CFI_ENDPROC END(coprocessor_error) ENTRY(simd_coprocessor_error) RING0_INT_FRAME pushl_cfi $0 #ifdef CONFIG_X86_INVD_BUG /* AMD 486 bug: invd from userspace calls exception 19 instead of #GP */ 661: pushl_cfi $do_general_protection 662: .section .altinstructions,"a" altinstruction_entry 661b, 663f, X86_FEATURE_XMM, 662b-661b, 664f-663f .previous .section .altinstr_replacement,"ax" 663: pushl $do_simd_coprocessor_error 664: .previous #else pushl_cfi $do_simd_coprocessor_error #endif jmp error_code CFI_ENDPROC END(simd_coprocessor_error) ENTRY(device_not_available) RING0_INT_FRAME pushl_cfi $-1 # mark this as an int pushl_cfi $do_device_not_available jmp error_code CFI_ENDPROC END(device_not_available) #ifdef CONFIG_PARAVIRT ENTRY(native_iret) iret .section __ex_table,"a" .align 4 .long native_iret, iret_exc .previous END(native_iret) ENTRY(native_irq_enable_sysexit) sti sysexit END(native_irq_enable_sysexit) #endif ENTRY(overflow) RING0_INT_FRAME pushl_cfi $0 pushl_cfi $do_overflow jmp error_code CFI_ENDPROC END(overflow) ENTRY(bounds) RING0_INT_FRAME pushl_cfi $0 pushl_cfi $do_bounds jmp error_code CFI_ENDPROC END(bounds) ENTRY(invalid_op) RING0_INT_FRAME pushl_cfi $0 pushl_cfi $do_invalid_op jmp error_code CFI_ENDPROC END(invalid_op) ENTRY(coprocessor_segment_overrun) RING0_INT_FRAME pushl_cfi $0 pushl_cfi $do_coprocessor_segment_overrun jmp error_code CFI_ENDPROC END(coprocessor_segment_overrun) ENTRY(invalid_TSS) RING0_EC_FRAME pushl_cfi $do_invalid_TSS jmp error_code CFI_ENDPROC END(invalid_TSS) ENTRY(segment_not_present) RING0_EC_FRAME pushl_cfi $do_segment_not_present jmp error_code CFI_ENDPROC END(segment_not_present) ENTRY(stack_segment) RING0_EC_FRAME pushl_cfi $do_stack_segment jmp error_code CFI_ENDPROC END(stack_segment) ENTRY(alignment_check) RING0_EC_FRAME pushl_cfi $do_alignment_check jmp error_code CFI_ENDPROC END(alignment_check) ENTRY(divide_error) RING0_INT_FRAME pushl_cfi $0 # no error code pushl_cfi $do_divide_error jmp error_code CFI_ENDPROC END(divide_error) #ifdef CONFIG_X86_MCE ENTRY(machine_check) RING0_INT_FRAME pushl_cfi $0 pushl_cfi machine_check_vector jmp error_code CFI_ENDPROC END(machine_check) #endif ENTRY(spurious_interrupt_bug) RING0_INT_FRAME pushl_cfi $0 pushl_cfi $do_spurious_interrupt_bug jmp error_code CFI_ENDPROC END(spurious_interrupt_bug) /* * End of kprobes section */ .popsection ENTRY(kernel_thread_helper) pushl $0 # fake return address for unwinder CFI_STARTPROC movl %edi,%eax call *%esi call do_exit ud2 # padding for call trace CFI_ENDPROC ENDPROC(kernel_thread_helper) #ifdef CONFIG_XEN /* Xen doesn't set %esp to be precisely what the normal sysenter entrypoint expects, so fix it up before using the normal path. */ ENTRY(xen_sysenter_target) RING0_INT_FRAME addl $5*4, %esp /* remove xen-provided frame */ CFI_ADJUST_CFA_OFFSET -5*4 jmp sysenter_past_esp CFI_ENDPROC ENTRY(xen_hypervisor_callback) CFI_STARTPROC pushl_cfi $0 SAVE_ALL TRACE_IRQS_OFF /* Check to see if we got the event in the critical region in xen_iret_direct, after we've reenabled events and checked for pending events. This simulates iret instruction's behaviour where it delivers a pending interrupt when enabling interrupts. */ movl PT_EIP(%esp),%eax cmpl $xen_iret_start_crit,%eax jb 1f cmpl $xen_iret_end_crit,%eax jae 1f jmp xen_iret_crit_fixup ENTRY(xen_do_upcall) 1: mov %esp, %eax call xen_evtchn_do_upcall jmp ret_from_intr CFI_ENDPROC ENDPROC(xen_hypervisor_callback) # Hypervisor uses this for application faults while it executes. # We get here for two reasons: # 1. Fault while reloading DS, ES, FS or GS # 2. Fault while executing IRET # Category 1 we fix up by reattempting the load, and zeroing the segment # register if the load fails. # Category 2 we fix up by jumping to do_iret_error. We cannot use the # normal Linux return path in this case because if we use the IRET hypercall # to pop the stack frame we end up in an infinite loop of failsafe callbacks. # We distinguish between categories by maintaining a status value in EAX. ENTRY(xen_failsafe_callback) CFI_STARTPROC pushl_cfi %eax movl $1,%eax 1: mov 4(%esp),%ds 2: mov 8(%esp),%es 3: mov 12(%esp),%fs 4: mov 16(%esp),%gs testl %eax,%eax popl_cfi %eax lea 16(%esp),%esp CFI_ADJUST_CFA_OFFSET -16 jz 5f addl $16,%esp jmp iret_exc # EAX != 0 => Category 2 (Bad IRET) 5: pushl_cfi $0 # EAX == 0 => Category 1 (Bad segment) SAVE_ALL jmp ret_from_exception CFI_ENDPROC .section .fixup,"ax" 6: xorl %eax,%eax movl %eax,4(%esp) jmp 1b 7: xorl %eax,%eax movl %eax,8(%esp) jmp 2b 8: xorl %eax,%eax movl %eax,12(%esp) jmp 3b 9: xorl %eax,%eax movl %eax,16(%esp) jmp 4b .previous .section __ex_table,"a" .align 4 .long 1b,6b .long 2b,7b .long 3b,8b .long 4b,9b .previous ENDPROC(xen_failsafe_callback) BUILD_INTERRUPT3(xen_hvm_callback_vector, XEN_HVM_EVTCHN_CALLBACK, xen_evtchn_do_upcall) #endif /* CONFIG_XEN */ #ifdef CONFIG_FUNCTION_TRACER #ifdef CONFIG_DYNAMIC_FTRACE ENTRY(mcount) ret END(mcount) ENTRY(ftrace_caller) cmpl $0, function_trace_stop jne ftrace_stub pushl %eax pushl %ecx pushl %edx movl 0xc(%esp), %eax movl 0x4(%ebp), %edx subl $MCOUNT_INSN_SIZE, %eax .globl ftrace_call ftrace_call: call ftrace_stub popl %edx popl %ecx popl %eax #ifdef CONFIG_FUNCTION_GRAPH_TRACER .globl ftrace_graph_call ftrace_graph_call: jmp ftrace_stub #endif .globl ftrace_stub ftrace_stub: ret END(ftrace_caller) #else /* ! CONFIG_DYNAMIC_FTRACE */ ENTRY(mcount) cmpl $0, function_trace_stop jne ftrace_stub cmpl $ftrace_stub, ftrace_trace_function jnz trace #ifdef CONFIG_FUNCTION_GRAPH_TRACER cmpl $ftrace_stub, ftrace_graph_return jnz ftrace_graph_caller cmpl $ftrace_graph_entry_stub, ftrace_graph_entry jnz ftrace_graph_caller #endif .globl ftrace_stub ftrace_stub: ret /* taken from glibc */ trace: pushl %eax pushl %ecx pushl %edx movl 0xc(%esp), %eax movl 0x4(%ebp), %edx subl $MCOUNT_INSN_SIZE, %eax call *ftrace_trace_function popl %edx popl %ecx popl %eax jmp ftrace_stub END(mcount) #endif /* CONFIG_DYNAMIC_FTRACE */ #endif /* CONFIG_FUNCTION_TRACER */ #ifdef CONFIG_FUNCTION_GRAPH_TRACER ENTRY(ftrace_graph_caller) cmpl $0, function_trace_stop jne ftrace_stub pushl %eax pushl %ecx pushl %edx movl 0xc(%esp), %edx lea 0x4(%ebp), %eax movl (%ebp), %ecx subl $MCOUNT_INSN_SIZE, %edx call prepare_ftrace_return popl %edx popl %ecx popl %eax ret END(ftrace_graph_caller) .globl return_to_handler return_to_handler: pushl %eax pushl %edx movl %ebp, %eax call ftrace_return_to_handler movl %eax, %ecx popl %edx popl %eax jmp *%ecx #endif .section .rodata,"a" #include "syscall_table_32.S" syscall_table_size=(.-sys_call_table) /* * Some functions should be protected against kprobes */ .pushsection .kprobes.text, "ax" ENTRY(page_fault) RING0_EC_FRAME pushl_cfi $do_page_fault ALIGN error_code: /* the function address is in %gs's slot on the stack */ pushl_cfi %fs /*CFI_REL_OFFSET fs, 0*/ pushl_cfi %es /*CFI_REL_OFFSET es, 0*/ pushl_cfi %ds /*CFI_REL_OFFSET ds, 0*/ pushl_cfi %eax CFI_REL_OFFSET eax, 0 pushl_cfi %ebp CFI_REL_OFFSET ebp, 0 pushl_cfi %edi CFI_REL_OFFSET edi, 0 pushl_cfi %esi CFI_REL_OFFSET esi, 0 pushl_cfi %edx CFI_REL_OFFSET edx, 0 pushl_cfi %ecx CFI_REL_OFFSET ecx, 0 pushl_cfi %ebx CFI_REL_OFFSET ebx, 0 cld movl $(__KERNEL_PERCPU), %ecx movl %ecx, %fs UNWIND_ESPFIX_STACK GS_TO_REG %ecx movl PT_GS(%esp), %edi # get the function address movl PT_ORIG_EAX(%esp), %edx # get the error code movl $-1, PT_ORIG_EAX(%esp) # no syscall to restart REG_TO_PTGS %ecx SET_KERNEL_GS %ecx movl $(__USER_DS), %ecx movl %ecx, %ds movl %ecx, %es TRACE_IRQS_OFF movl %esp,%eax # pt_regs pointer call *%edi jmp ret_from_exception CFI_ENDPROC END(page_fault) /* * Debug traps and NMI can happen at the one SYSENTER instruction * that sets up the real kernel stack. Check here, since we can't * allow the wrong stack to be used. * * "TSS_sysenter_sp0+12" is because the NMI/debug handler will have * already pushed 3 words if it hits on the sysenter instruction: * eflags, cs and eip. * * We just load the right stack, and push the three (known) values * by hand onto the new stack - while updating the return eip past * the instruction that would have done it for sysenter. */ .macro FIX_STACK offset ok label cmpw $__KERNEL_CS, 4(%esp) jne \ok \label: movl TSS_sysenter_sp0 + \offset(%esp), %esp CFI_DEF_CFA esp, 0 CFI_UNDEFINED eip pushfl_cfi pushl_cfi $__KERNEL_CS pushl_cfi $sysenter_past_esp CFI_REL_OFFSET eip, 0 .endm ENTRY(debug) RING0_INT_FRAME cmpl $ia32_sysenter_target,(%esp) jne debug_stack_correct FIX_STACK 12, debug_stack_correct, debug_esp_fix_insn debug_stack_correct: pushl_cfi $-1 # mark this as an int SAVE_ALL TRACE_IRQS_OFF xorl %edx,%edx # error code 0 movl %esp,%eax # pt_regs pointer call do_debug jmp ret_from_exception CFI_ENDPROC END(debug) /* * NMI is doubly nasty. It can happen _while_ we're handling * a debug fault, and the debug fault hasn't yet been able to * clear up the stack. So we first check whether we got an * NMI on the sysenter entry path, but after that we need to * check whether we got an NMI on the debug path where the debug * fault happened on the sysenter path. */ ENTRY(nmi) RING0_INT_FRAME pushl_cfi %eax movl %ss, %eax cmpw $__ESPFIX_SS, %ax popl_cfi %eax je nmi_espfix_stack cmpl $ia32_sysenter_target,(%esp) je nmi_stack_fixup pushl_cfi %eax movl %esp,%eax /* Do not access memory above the end of our stack page, * it might not exist. */ andl $(THREAD_SIZE-1),%eax cmpl $(THREAD_SIZE-20),%eax popl_cfi %eax jae nmi_stack_correct cmpl $ia32_sysenter_target,12(%esp) je nmi_debug_stack_check nmi_stack_correct: /* We have a RING0_INT_FRAME here */ pushl_cfi %eax SAVE_ALL xorl %edx,%edx # zero error code movl %esp,%eax # pt_regs pointer call do_nmi jmp restore_all_notrace CFI_ENDPROC nmi_stack_fixup: RING0_INT_FRAME FIX_STACK 12, nmi_stack_correct, 1 jmp nmi_stack_correct nmi_debug_stack_check: /* We have a RING0_INT_FRAME here */ cmpw $__KERNEL_CS,16(%esp) jne nmi_stack_correct cmpl $debug,(%esp) jb nmi_stack_correct cmpl $debug_esp_fix_insn,(%esp) ja nmi_stack_correct FIX_STACK 24, nmi_stack_correct, 1 jmp nmi_stack_correct nmi_espfix_stack: /* We have a RING0_INT_FRAME here. * * create the pointer to lss back */ pushl_cfi %ss pushl_cfi %esp addl $4, (%esp) /* copy the iret frame of 12 bytes */ .rept 3 pushl_cfi 16(%esp) .endr pushl_cfi %eax SAVE_ALL FIXUP_ESPFIX_STACK # %eax == %esp xorl %edx,%edx # zero error code call do_nmi RESTORE_REGS lss 12+4(%esp), %esp # back to espfix stack CFI_ADJUST_CFA_OFFSET -24 jmp irq_return CFI_ENDPROC END(nmi) ENTRY(int3) RING0_INT_FRAME pushl_cfi $-1 # mark this as an int SAVE_ALL TRACE_IRQS_OFF xorl %edx,%edx # zero error code movl %esp,%eax # pt_regs pointer call do_int3 jmp ret_from_exception CFI_ENDPROC END(int3) ENTRY(general_protection) RING0_EC_FRAME pushl_cfi $do_general_protection jmp error_code CFI_ENDPROC END(general_protection) #ifdef CONFIG_KVM_GUEST ENTRY(async_page_fault) RING0_EC_FRAME pushl_cfi $do_async_page_fault jmp error_code CFI_ENDPROC END(async_page_fault) #endif /* * End of kprobes section */ .popsection --- Professional hosting for everyone - http://www.host.ru