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Diffstat (limited to 'arch/x86_64/kernel/entry.S')
| -rw-r--r-- | arch/x86_64/kernel/entry.S | 920 |
1 files changed, 920 insertions, 0 deletions
diff --git a/arch/x86_64/kernel/entry.S b/arch/x86_64/kernel/entry.S new file mode 100644 index 000000000000..e126284db7a8 --- /dev/null +++ b/arch/x86_64/kernel/entry.S @@ -0,0 +1,920 @@ +/* + * linux/arch/x86_64/entry.S + * + * Copyright (C) 1991, 1992 Linus Torvalds + * Copyright (C) 2000, 2001, 2002 Andi Kleen SuSE Labs + * Copyright (C) 2000 Pavel Machek <pavel@suse.cz> + * + * $Id$ + */ + +/* + * entry.S contains the system-call and fault low-level handling routines. + * + * NOTE: This code handles signal-recognition, which happens every time + * after an interrupt and after each system call. + * + * Normal syscalls and interrupts don't save a full stack frame, this is + * only done for syscall tracing, signals or fork/exec et.al. + * + * A note on terminology: + * - top of stack: Architecture defined interrupt frame from SS to RIP + * at the top of the kernel process stack. + * - partial stack frame: partially saved registers upto R11. + * - full stack frame: Like partial stack frame, but all register saved. + * + * TODO: + * - schedule it carefully for the final hardware. + */ + +#define ASSEMBLY 1 +#include <linux/config.h> +#include <linux/linkage.h> +#include <asm/segment.h> +#include <asm/smp.h> +#include <asm/cache.h> +#include <asm/errno.h> +#include <asm/dwarf2.h> +#include <asm/calling.h> +#include <asm/offset.h> +#include <asm/msr.h> +#include <asm/unistd.h> +#include <asm/thread_info.h> +#include <asm/hw_irq.h> + + .code64 + +#ifdef CONFIG_PREEMPT +#define preempt_stop cli +#else +#define preempt_stop +#define retint_kernel retint_restore_args +#endif + +/* + * C code is not supposed to know about undefined top of stack. Every time + * a C function with an pt_regs argument is called from the SYSCALL based + * fast path FIXUP_TOP_OF_STACK is needed. + * RESTORE_TOP_OF_STACK syncs the syscall state after any possible ptregs + * manipulation. + */ + + /* %rsp:at FRAMEEND */ + .macro FIXUP_TOP_OF_STACK tmp + movq %gs:pda_oldrsp,\tmp + movq \tmp,RSP(%rsp) + movq $__USER_DS,SS(%rsp) + movq $__USER_CS,CS(%rsp) + movq $-1,RCX(%rsp) + movq R11(%rsp),\tmp /* get eflags */ + movq \tmp,EFLAGS(%rsp) + .endm + + .macro RESTORE_TOP_OF_STACK tmp,offset=0 + movq RSP-\offset(%rsp),\tmp + movq \tmp,%gs:pda_oldrsp + movq EFLAGS-\offset(%rsp),\tmp + movq \tmp,R11-\offset(%rsp) + .endm + + .macro FAKE_STACK_FRAME child_rip + /* push in order ss, rsp, eflags, cs, rip */ + xorq %rax, %rax + pushq %rax /* ss */ + CFI_ADJUST_CFA_OFFSET 8 + pushq %rax /* rsp */ + CFI_ADJUST_CFA_OFFSET 8 + CFI_OFFSET rip,0 + pushq $(1<<9) /* eflags - interrupts on */ + CFI_ADJUST_CFA_OFFSET 8 + pushq $__KERNEL_CS /* cs */ + CFI_ADJUST_CFA_OFFSET 8 + pushq \child_rip /* rip */ + CFI_ADJUST_CFA_OFFSET 8 + CFI_OFFSET rip,0 + pushq %rax /* orig rax */ + CFI_ADJUST_CFA_OFFSET 8 + .endm + + .macro UNFAKE_STACK_FRAME + addq $8*6, %rsp + CFI_ADJUST_CFA_OFFSET -(6*8) + .endm + + .macro CFI_DEFAULT_STACK + CFI_ADJUST_CFA_OFFSET (SS) + CFI_OFFSET r15,R15-SS + CFI_OFFSET r14,R14-SS + CFI_OFFSET r13,R13-SS + CFI_OFFSET r12,R12-SS + CFI_OFFSET rbp,RBP-SS + CFI_OFFSET rbx,RBX-SS + CFI_OFFSET r11,R11-SS + CFI_OFFSET r10,R10-SS + CFI_OFFSET r9,R9-SS + CFI_OFFSET r8,R8-SS + CFI_OFFSET rax,RAX-SS + CFI_OFFSET rcx,RCX-SS + CFI_OFFSET rdx,RDX-SS + CFI_OFFSET rsi,RSI-SS + CFI_OFFSET rdi,RDI-SS + CFI_OFFSET rsp,RSP-SS + CFI_OFFSET rip,RIP-SS + .endm +/* + * A newly forked process directly context switches into this. + */ +/* rdi: prev */ +ENTRY(ret_from_fork) + CFI_STARTPROC + CFI_DEFAULT_STACK + call schedule_tail + GET_THREAD_INFO(%rcx) + testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT),threadinfo_flags(%rcx) + jnz rff_trace +rff_action: + RESTORE_REST + testl $3,CS-ARGOFFSET(%rsp) # from kernel_thread? + je int_ret_from_sys_call + testl $_TIF_IA32,threadinfo_flags(%rcx) + jnz int_ret_from_sys_call + RESTORE_TOP_OF_STACK %rdi,ARGOFFSET + jmp ret_from_sys_call +rff_trace: + movq %rsp,%rdi + call syscall_trace_leave + GET_THREAD_INFO(%rcx) + jmp rff_action + CFI_ENDPROC + +/* + * System call entry. Upto 6 arguments in registers are supported. + * + * SYSCALL does not save anything on the stack and does not change the + * stack pointer. + */ + +/* + * Register setup: + * rax system call number + * rdi arg0 + * rcx return address for syscall/sysret, C arg3 + * rsi arg1 + * rdx arg2 + * r10 arg3 (--> moved to rcx for C) + * r8 arg4 + * r9 arg5 + * r11 eflags for syscall/sysret, temporary for C + * r12-r15,rbp,rbx saved by C code, not touched. + * + * Interrupts are off on entry. + * Only called from user space. + * + * XXX if we had a free scratch register we could save the RSP into the stack frame + * and report it properly in ps. Unfortunately we haven't. + */ + +ENTRY(system_call) + CFI_STARTPROC + swapgs + movq %rsp,%gs:pda_oldrsp + movq %gs:pda_kernelstack,%rsp + sti + SAVE_ARGS 8,1 + movq %rax,ORIG_RAX-ARGOFFSET(%rsp) + movq %rcx,RIP-ARGOFFSET(%rsp) + GET_THREAD_INFO(%rcx) + testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP),threadinfo_flags(%rcx) + jnz tracesys + cmpq $__NR_syscall_max,%rax + ja badsys + movq %r10,%rcx + call *sys_call_table(,%rax,8) # XXX: rip relative + movq %rax,RAX-ARGOFFSET(%rsp) +/* + * Syscall return path ending with SYSRET (fast path) + * Has incomplete stack frame and undefined top of stack. + */ + .globl ret_from_sys_call +ret_from_sys_call: + movl $_TIF_WORK_MASK,%edi + /* edi: flagmask */ +sysret_check: + GET_THREAD_INFO(%rcx) + cli + movl threadinfo_flags(%rcx),%edx + andl %edi,%edx + jnz sysret_careful + movq RIP-ARGOFFSET(%rsp),%rcx + RESTORE_ARGS 0,-ARG_SKIP,1 + movq %gs:pda_oldrsp,%rsp + swapgs + sysretq + + /* Handle reschedules */ + /* edx: work, edi: workmask */ +sysret_careful: + bt $TIF_NEED_RESCHED,%edx + jnc sysret_signal + sti + pushq %rdi + call schedule + popq %rdi + jmp sysret_check + + /* Handle a signal */ +sysret_signal: + sti + testl $(_TIF_SIGPENDING|_TIF_NOTIFY_RESUME|_TIF_SINGLESTEP),%edx + jz 1f + + /* Really a signal */ + /* edx: work flags (arg3) */ + leaq do_notify_resume(%rip),%rax + leaq -ARGOFFSET(%rsp),%rdi # &pt_regs -> arg1 + xorl %esi,%esi # oldset -> arg2 + call ptregscall_common +1: movl $_TIF_NEED_RESCHED,%edi + jmp sysret_check + + /* Do syscall tracing */ +tracesys: + SAVE_REST + movq $-ENOSYS,RAX(%rsp) + FIXUP_TOP_OF_STACK %rdi + movq %rsp,%rdi + call syscall_trace_enter + LOAD_ARGS ARGOFFSET /* reload args from stack in case ptrace changed it */ + RESTORE_REST + cmpq $__NR_syscall_max,%rax + ja 1f + movq %r10,%rcx /* fixup for C */ + call *sys_call_table(,%rax,8) + movq %rax,RAX-ARGOFFSET(%rsp) +1: SAVE_REST + movq %rsp,%rdi + call syscall_trace_leave + RESTORE_TOP_OF_STACK %rbx + RESTORE_REST + jmp ret_from_sys_call + +badsys: + movq $-ENOSYS,RAX-ARGOFFSET(%rsp) + jmp ret_from_sys_call + +/* + * Syscall return path ending with IRET. + * Has correct top of stack, but partial stack frame. + */ +ENTRY(int_ret_from_sys_call) + cli + testl $3,CS-ARGOFFSET(%rsp) + je retint_restore_args + movl $_TIF_ALLWORK_MASK,%edi + /* edi: mask to check */ +int_with_check: + GET_THREAD_INFO(%rcx) + movl threadinfo_flags(%rcx),%edx + andl %edi,%edx + jnz int_careful + jmp retint_swapgs + + /* Either reschedule or signal or syscall exit tracking needed. */ + /* First do a reschedule test. */ + /* edx: work, edi: workmask */ +int_careful: + bt $TIF_NEED_RESCHED,%edx + jnc int_very_careful + sti + pushq %rdi + call schedule + popq %rdi + jmp int_with_check + + /* handle signals and tracing -- both require a full stack frame */ +int_very_careful: + sti + SAVE_REST + /* Check for syscall exit trace */ + testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP),%edx + jz int_signal + pushq %rdi + leaq 8(%rsp),%rdi # &ptregs -> arg1 + call syscall_trace_leave + popq %rdi + btr $TIF_SYSCALL_TRACE,%edi + btr $TIF_SYSCALL_AUDIT,%edi + btr $TIF_SINGLESTEP,%edi + jmp int_restore_rest + +int_signal: + testl $(_TIF_NOTIFY_RESUME|_TIF_SIGPENDING|_TIF_SINGLESTEP),%edx + jz 1f + movq %rsp,%rdi # &ptregs -> arg1 + xorl %esi,%esi # oldset -> arg2 + call do_notify_resume +1: movl $_TIF_NEED_RESCHED,%edi +int_restore_rest: + RESTORE_REST + jmp int_with_check + CFI_ENDPROC + +/* + * Certain special system calls that need to save a complete full stack frame. + */ + + .macro PTREGSCALL label,func,arg + .globl \label +\label: + leaq \func(%rip),%rax + leaq -ARGOFFSET+8(%rsp),\arg /* 8 for return address */ + jmp ptregscall_common + .endm + + PTREGSCALL stub_clone, sys_clone, %r8 + PTREGSCALL stub_fork, sys_fork, %rdi + PTREGSCALL stub_vfork, sys_vfork, %rdi + PTREGSCALL stub_rt_sigsuspend, sys_rt_sigsuspend, %rdx + PTREGSCALL stub_sigaltstack, sys_sigaltstack, %rdx + PTREGSCALL stub_iopl, sys_iopl, %rsi + +ENTRY(ptregscall_common) + CFI_STARTPROC + popq %r11 + CFI_ADJUST_CFA_OFFSET -8 + SAVE_REST + movq %r11, %r15 + FIXUP_TOP_OF_STACK %r11 + call *%rax + RESTORE_TOP_OF_STACK %r11 + movq %r15, %r11 + RESTORE_REST + pushq %r11 + CFI_ADJUST_CFA_OFFSET 8 + ret + CFI_ENDPROC + +ENTRY(stub_execve) + CFI_STARTPROC + popq %r11 + CFI_ADJUST_CFA_OFFSET -8 + SAVE_REST + movq %r11, %r15 + FIXUP_TOP_OF_STACK %r11 + call sys_execve + GET_THREAD_INFO(%rcx) + bt $TIF_IA32,threadinfo_flags(%rcx) + jc exec_32bit + RESTORE_TOP_OF_STACK %r11 + movq %r15, %r11 + RESTORE_REST + push %r11 + ret + +exec_32bit: + CFI_ADJUST_CFA_OFFSET REST_SKIP + movq %rax,RAX(%rsp) + RESTORE_REST + jmp int_ret_from_sys_call + CFI_ENDPROC + +/* + * sigreturn is special because it needs to restore all registers on return. + * This cannot be done with SYSRET, so use the IRET return path instead. + */ +ENTRY(stub_rt_sigreturn) + CFI_STARTPROC + addq $8, %rsp + SAVE_REST + movq %rsp,%rdi + FIXUP_TOP_OF_STACK %r11 + call sys_rt_sigreturn + movq %rax,RAX(%rsp) # fixme, this could be done at the higher layer + RESTORE_REST + jmp int_ret_from_sys_call + CFI_ENDPROC + +/* + * Interrupt entry/exit. + * + * Interrupt entry points save only callee clobbered registers in fast path. + * + * Entry runs with interrupts off. + */ + +/* 0(%rsp): interrupt number */ + .macro interrupt func + CFI_STARTPROC simple + CFI_DEF_CFA rsp,(SS-RDI) + CFI_REL_OFFSET rsp,(RSP-ORIG_RAX) + CFI_REL_OFFSET rip,(RIP-ORIG_RAX) + cld +#ifdef CONFIG_DEBUG_INFO + SAVE_ALL + movq %rsp,%rdi + /* + * Setup a stack frame pointer. This allows gdb to trace + * back to the original stack. + */ + movq %rsp,%rbp + CFI_DEF_CFA_REGISTER rbp +#else + SAVE_ARGS + leaq -ARGOFFSET(%rsp),%rdi # arg1 for handler +#endif + testl $3,CS(%rdi) + je 1f + swapgs +1: addl $1,%gs:pda_irqcount # RED-PEN should check preempt count + movq %gs:pda_irqstackptr,%rax + cmoveq %rax,%rsp + pushq %rdi # save old stack + call \func + .endm + +ENTRY(common_interrupt) + interrupt do_IRQ + /* 0(%rsp): oldrsp-ARGOFFSET */ +ret_from_intr: + popq %rdi + cli + subl $1,%gs:pda_irqcount +#ifdef CONFIG_DEBUG_INFO + movq RBP(%rdi),%rbp +#endif + leaq ARGOFFSET(%rdi),%rsp +exit_intr: + GET_THREAD_INFO(%rcx) + testl $3,CS-ARGOFFSET(%rsp) + je retint_kernel + + /* Interrupt came from user space */ + /* + * Has a correct top of stack, but a partial stack frame + * %rcx: thread info. Interrupts off. + */ +retint_with_reschedule: + movl $_TIF_WORK_MASK,%edi +retint_check: + movl threadinfo_flags(%rcx),%edx + andl %edi,%edx + jnz retint_careful +retint_swapgs: + cli + swapgs +retint_restore_args: + cli + RESTORE_ARGS 0,8,0 +iret_label: + iretq + + .section __ex_table,"a" + .quad iret_label,bad_iret + .previous + .section .fixup,"ax" + /* force a signal here? this matches i386 behaviour */ + /* running with kernel gs */ +bad_iret: + movq $-9999,%rdi /* better code? */ + jmp do_exit + .previous + + /* edi: workmask, edx: work */ +retint_careful: + bt $TIF_NEED_RESCHED,%edx + jnc retint_signal + sti + pushq %rdi + call schedule + popq %rdi + GET_THREAD_INFO(%rcx) + cli + jmp retint_check + +retint_signal: + testl $(_TIF_SIGPENDING|_TIF_NOTIFY_RESUME|_TIF_SINGLESTEP),%edx + jz retint_swapgs + sti + SAVE_REST + movq $-1,ORIG_RAX(%rsp) + xorq %rsi,%rsi # oldset + movq %rsp,%rdi # &pt_regs + call do_notify_resume + RESTORE_REST + cli + movl $_TIF_NEED_RESCHED,%edi + GET_THREAD_INFO(%rcx) + jmp retint_check + +#ifdef CONFIG_PREEMPT + /* Returning to kernel space. Check if we need preemption */ + /* rcx: threadinfo. interrupts off. */ + .p2align +retint_kernel: + cmpl $0,threadinfo_preempt_count(%rcx) + jnz retint_restore_args + bt $TIF_NEED_RESCHED,threadinfo_flags(%rcx) + jnc retint_restore_args + bt $9,EFLAGS-ARGOFFSET(%rsp) /* interrupts off? */ + jnc retint_restore_args + call preempt_schedule_irq + jmp exit_intr +#endif + CFI_ENDPROC + +/* + * APIC interrupts. + */ + .macro apicinterrupt num,func + pushq $\num-256 + interrupt \func + jmp ret_from_intr + CFI_ENDPROC + .endm + +ENTRY(thermal_interrupt) + apicinterrupt THERMAL_APIC_VECTOR,smp_thermal_interrupt + +#ifdef CONFIG_SMP +ENTRY(reschedule_interrupt) + apicinterrupt RESCHEDULE_VECTOR,smp_reschedule_interrupt + +ENTRY(invalidate_interrupt) + apicinterrupt INVALIDATE_TLB_VECTOR,smp_invalidate_interrupt + +ENTRY(call_function_interrupt) + apicinterrupt CALL_FUNCTION_VECTOR,smp_call_function_interrupt +#endif + +#ifdef CONFIG_X86_LOCAL_APIC +ENTRY(apic_timer_interrupt) + apicinterrupt LOCAL_TIMER_VECTOR,smp_apic_timer_interrupt + +ENTRY(error_interrupt) + apicinterrupt ERROR_APIC_VECTOR,smp_error_interrupt + +ENTRY(spurious_interrupt) + apicinterrupt SPURIOUS_APIC_VECTOR,smp_spurious_interrupt +#endif + +/* + * Exception entry points. + */ + .macro zeroentry sym + pushq $0 /* push error code/oldrax */ + pushq %rax /* push real oldrax to the rdi slot */ + leaq \sym(%rip),%rax + jmp error_entry + .endm + + .macro errorentry sym + pushq %rax + leaq \sym(%rip),%rax + jmp error_entry + .endm + + /* error code is on the stack already */ + /* handle NMI like exceptions that can happen everywhere */ + .macro paranoidentry sym + SAVE_ALL + cld + movl $1,%ebx + movl $MSR_GS_BASE,%ecx + rdmsr + testl %edx,%edx + js 1f + swapgs + xorl %ebx,%ebx +1: movq %rsp,%rdi + movq ORIG_RAX(%rsp),%rsi + movq $-1,ORIG_RAX(%rsp) + call \sym + .endm + +/* + * Exception entry point. This expects an error code/orig_rax on the stack + * and the exception handler in %rax. + */ +ENTRY(error_entry) + CFI_STARTPROC simple + CFI_DEF_CFA rsp,(SS-RDI) + CFI_REL_OFFSET rsp,(RSP-RDI) + CFI_REL_OFFSET rip,(RIP-RDI) + /* rdi slot contains rax, oldrax contains error code */ + cld + subq $14*8,%rsp + CFI_ADJUST_CFA_OFFSET (14*8) + movq %rsi,13*8(%rsp) + CFI_REL_OFFSET rsi,RSI + movq 14*8(%rsp),%rsi /* load rax from rdi slot */ + movq %rdx,12*8(%rsp) + CFI_REL_OFFSET rdx,RDX + movq %rcx,11*8(%rsp) + CFI_REL_OFFSET rcx,RCX + movq %rsi,10*8(%rsp) /* store rax */ + CFI_REL_OFFSET rax,RAX + movq %r8, 9*8(%rsp) + CFI_REL_OFFSET r8,R8 + movq %r9, 8*8(%rsp) + CFI_REL_OFFSET r9,R9 + movq %r10,7*8(%rsp) + CFI_REL_OFFSET r10,R10 + movq %r11,6*8(%rsp) + CFI_REL_OFFSET r11,R11 + movq %rbx,5*8(%rsp) + CFI_REL_OFFSET rbx,RBX + movq %rbp,4*8(%rsp) + CFI_REL_OFFSET rbp,RBP + movq %r12,3*8(%rsp) + CFI_REL_OFFSET r12,R12 + movq %r13,2*8(%rsp) + CFI_REL_OFFSET r13,R13 + movq %r14,1*8(%rsp) + CFI_REL_OFFSET r14,R14 + movq %r15,(%rsp) + CFI_REL_OFFSET r15,R15 + xorl %ebx,%ebx + testl $3,CS(%rsp) + je error_kernelspace +error_swapgs: + swapgs +error_sti: + movq %rdi,RDI(%rsp) + movq %rsp,%rdi + movq ORIG_RAX(%rsp),%rsi /* get error code */ + movq $-1,ORIG_RAX(%rsp) + call *%rax + /* ebx: no swapgs flag (1: don't need swapgs, 0: need it) */ +error_exit: + movl %ebx,%eax + RESTORE_REST + cli + GET_THREAD_INFO(%rcx) + testl %eax,%eax + jne retint_kernel + movl threadinfo_flags(%rcx),%edx + movl $_TIF_WORK_MASK,%edi + andl %edi,%edx + jnz retint_careful + swapgs + RESTORE_ARGS 0,8,0 + iretq + CFI_ENDPROC + +error_kernelspace: + incl %ebx + /* There are two places in the kernel that can potentially fault with + usergs. Handle them here. The exception handlers after + iret run with kernel gs again, so don't set the user space flag. + B stepping K8s sometimes report an truncated RIP for IRET + exceptions returning to compat mode. Check for these here too. */ + leaq iret_label(%rip),%rbp + cmpq %rbp,RIP(%rsp) + je error_swapgs + movl %ebp,%ebp /* zero extend */ + cmpq %rbp,RIP(%rsp) + je error_swapgs + cmpq $gs_change,RIP(%rsp) + je error_swapgs + jmp error_sti + + /* Reload gs selector with exception handling */ + /* edi: new selector */ +ENTRY(load_gs_index) + pushf + cli + swapgs +gs_change: + movl %edi,%gs +2: mfence /* workaround */ + swapgs + popf + ret + + .section __ex_table,"a" + .align 8 + .quad gs_change,bad_gs + .previous + .section .fixup,"ax" + /* running with kernelgs */ +bad_gs: + swapgs /* switch back to user gs */ + xorl %eax,%eax + movl %eax,%gs + jmp 2b + .previous + +/* + * Create a kernel thread. + * + * C extern interface: + * extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) + * + * asm input arguments: + * rdi: fn, rsi: arg, rdx: flags + */ +ENTRY(kernel_thread) + CFI_STARTPROC + FAKE_STACK_FRAME $child_rip + SAVE_ALL + + # rdi: flags, rsi: usp, rdx: will be &pt_regs + movq %rdx,%rdi + orq kernel_thread_flags(%rip),%rdi + movq $-1, %rsi + movq %rsp, %rdx + + xorl %r8d,%r8d + xorl %r9d,%r9d + + # clone now + call do_fork + movq %rax,RAX(%rsp) + xorl %edi,%edi + + /* + * It isn't worth to check for reschedule here, + * so internally to the x86_64 port you can rely on kernel_thread() + * not to reschedule the child before returning, this avoids the need + * of hacks for example to fork off the per-CPU idle tasks. + * [Hopefully no generic code relies on the reschedule -AK] + */ + RESTORE_ALL + UNFAKE_STACK_FRAME + ret + CFI_ENDPROC + + +child_rip: + /* + * Here we are in the child and the registers are set as they were + * at kernel_thread() invocation in the parent. + */ + movq %rdi, %rax + movq %rsi, %rdi + call *%rax + # exit + xorq %rdi, %rdi + call do_exit + +/* + * execve(). This function needs to use IRET, not SYSRET, to set up all state properly. + * + * C extern interface: + * extern long execve(char *name, char **argv, char **envp) + * + * asm input arguments: + * rdi: name, rsi: argv, rdx: envp + * + * We want to fallback into: + * extern long sys_execve(char *name, char **argv,char **envp, struct pt_regs regs) + * + * do_sys_execve asm fallback arguments: + * rdi: name, rsi: argv, rdx: envp, fake frame on the stack + */ +ENTRY(execve) + CFI_STARTPROC + FAKE_STACK_FRAME $0 + SAVE_ALL + call sys_execve + movq %rax, RAX(%rsp) + RESTORE_REST + testq %rax,%rax + je int_ret_from_sys_call + RESTORE_ARGS + UNFAKE_STACK_FRAME + ret + CFI_ENDPROC + +ENTRY(page_fault) + errorentry do_page_fault + +ENTRY(coprocessor_error) + zeroentry do_coprocessor_error + +ENTRY(simd_coprocessor_error) + zeroentry do_simd_coprocessor_error + +ENTRY(device_not_available) + zeroentry math_state_restore + + /* runs on exception stack */ +ENTRY(debug) + CFI_STARTPROC + pushq $0 + CFI_ADJUST_CFA_OFFSET 8 + paranoidentry do_debug + /* switch back to process stack to restore the state ptrace touched */ + movq %rax,%rsp + testl $3,CS(%rsp) + jnz paranoid_userspace + jmp paranoid_exit + CFI_ENDPROC + + /* runs on exception stack */ +ENTRY(nmi) + CFI_STARTPROC + pushq $-1 + CFI_ADJUST_CFA_OFFSET 8 + paranoidentry do_nmi + /* ebx: no swapgs flag */ +paranoid_exit: + testl %ebx,%ebx /* swapgs needed? */ + jnz paranoid_restore +paranoid_swapgs: + cli + swapgs +paranoid_restore: + RESTORE_ALL 8 + iretq +paranoid_userspace: + cli + GET_THREAD_INFO(%rcx) + movl threadinfo_flags(%rcx),%edx + testl $_TIF_NEED_RESCHED,%edx + jnz paranoid_resched + testl $(_TIF_SIGPENDING|_TIF_NOTIFY_RESUME|_TIF_SINGLESTEP),%edx + jnz paranoid_signal + jmp paranoid_swapgs +paranoid_resched: + sti + call schedule + jmp paranoid_exit +paranoid_signal: + sti + xorl %esi,%esi /* oldset */ + movq %rsp,%rdi /* &pt_regs */ + call do_notify_resume + jmp paranoid_exit + CFI_ENDPROC + +ENTRY(int3) + zeroentry do_int3 + +ENTRY(overflow) + zeroentry do_overflow + +ENTRY(bounds) + zeroentry do_bounds + +ENTRY(invalid_op) + zeroentry do_invalid_op + +ENTRY(coprocessor_segment_overrun) + zeroentry do_coprocessor_segment_overrun + +ENTRY(reserved) + zeroentry do_reserved + + /* runs on exception stack */ +ENTRY(double_fault) + CFI_STARTPROC + paranoidentry do_double_fault + movq %rax,%rsp + testl $3,CS(%rsp) + jnz paranoid_userspace + jmp paranoid_exit + CFI_ENDPROC + +ENTRY(invalid_TSS) + errorentry do_invalid_TSS + +ENTRY(segment_not_present) + errorentry do_segment_not_present + + /* runs on exception stack */ +ENTRY(stack_segment) + CFI_STARTPROC + paranoidentry do_stack_segment + movq %rax,%rsp + testl $3,CS(%rsp) + jnz paranoid_userspace + jmp paranoid_exit + CFI_ENDPROC + +ENTRY(general_protection) + errorentry do_general_protection + +ENTRY(alignment_check) + errorentry do_alignment_check + +ENTRY(divide_error) + zeroentry do_divide_error + +ENTRY(spurious_interrupt_bug) + zeroentry do_spurious_interrupt_bug + +#ifdef CONFIG_X86_MCE + /* runs on exception stack */ +ENTRY(machine_check) + CFI_STARTPROC + pushq $0 + CFI_ADJUST_CFA_OFFSET 8 + paranoidentry do_machine_check + jmp paranoid_exit + CFI_ENDPROC +#endif + +ENTRY(call_debug) + zeroentry do_call_debug + |