forked from luck/tmp_suning_uos_patched
x86/entry: Remove the apic/BUILD interrupt leftovers
Remove all the code which was there to emit the system vector stubs. All users are gone. Move the now unused GET_CR2_INTO macro muck to head_64.S where the last user is. Fixup the eye hurting comment there while at it. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org> Acked-by: Andy Lutomirski <luto@kernel.org> Link: https://lore.kernel.org/r/20200521202119.927433002@linutronix.de
This commit is contained in:
Thomas Gleixner
parent
13cad9851e
commit
75da04f7f3
|
|
@ -351,23 +351,3 @@ For 32-bit we have the following conventions - kernel is built with
|
|||
call stackleak_erase
|
||||
#endif
|
||||
.endm
|
||||
|
||||
/*
|
||||
* This does 'call enter_from_user_mode' unless we can avoid it based on
|
||||
* kernel config or using the static jump infrastructure.
|
||||
*/
|
||||
.macro CALL_enter_from_user_mode
|
||||
#ifdef CONFIG_CONTEXT_TRACKING
|
||||
#ifdef CONFIG_JUMP_LABEL
|
||||
STATIC_JUMP_IF_FALSE .Lafter_call_\@, context_tracking_key, def=0
|
||||
#endif
|
||||
call enter_from_user_mode
|
||||
.Lafter_call_\@:
|
||||
#endif
|
||||
.endm
|
||||
|
||||
#ifdef CONFIG_PARAVIRT_XXL
|
||||
#define GET_CR2_INTO(reg) GET_CR2_INTO_AX ; _ASM_MOV %_ASM_AX, reg
|
||||
#else
|
||||
#define GET_CR2_INTO(reg) _ASM_MOV %cr2, reg
|
||||
#endif
|
||||
|
|
|
|||
|
|
@ -1233,24 +1233,6 @@ SYM_FUNC_END(entry_INT80_32)
|
|||
#endif
|
||||
.endm
|
||||
|
||||
#define BUILD_INTERRUPT3(name, nr, fn) \
|
||||
SYM_FUNC_START(name) \
|
||||
ASM_CLAC; \
|
||||
pushl $~(nr); \
|
||||
SAVE_ALL switch_stacks=1; \
|
||||
ENCODE_FRAME_POINTER; \
|
||||
TRACE_IRQS_OFF \
|
||||
movl %esp, %eax; \
|
||||
call fn; \
|
||||
jmp ret_from_intr; \
|
||||
SYM_FUNC_END(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 <asm/entry_arch.h>
|
||||
|
||||
#ifdef CONFIG_PARAVIRT
|
||||
SYM_CODE_START(native_iret)
|
||||
iret
|
||||
|
|
|
|||
|
|
@ -658,108 +658,7 @@ SYM_CODE_END(\asmsym)
|
|||
*/
|
||||
#include <asm/idtentry.h>
|
||||
|
||||
/*
|
||||
* Interrupt entry helper function.
|
||||
*
|
||||
* Entry runs with interrupts off. Stack layout at entry:
|
||||
* +----------------------------------------------------+
|
||||
* | regs->ss |
|
||||
* | regs->rsp |
|
||||
* | regs->eflags |
|
||||
* | regs->cs |
|
||||
* | regs->ip |
|
||||
* +----------------------------------------------------+
|
||||
* | regs->orig_ax = ~(interrupt number) |
|
||||
* +----------------------------------------------------+
|
||||
* | return address |
|
||||
* +----------------------------------------------------+
|
||||
*/
|
||||
SYM_CODE_START(interrupt_entry)
|
||||
UNWIND_HINT_IRET_REGS offset=16
|
||||
ASM_CLAC
|
||||
cld
|
||||
|
||||
testb $3, CS-ORIG_RAX+8(%rsp)
|
||||
jz 1f
|
||||
SWAPGS
|
||||
FENCE_SWAPGS_USER_ENTRY
|
||||
/*
|
||||
* Switch to the thread stack. The IRET frame and orig_ax are
|
||||
* on the stack, as well as the return address. RDI..R12 are
|
||||
* not (yet) on the stack and space has not (yet) been
|
||||
* allocated for them.
|
||||
*/
|
||||
pushq %rdi
|
||||
|
||||
/* Need to switch before accessing the thread stack. */
|
||||
SWITCH_TO_KERNEL_CR3 scratch_reg=%rdi
|
||||
movq %rsp, %rdi
|
||||
movq PER_CPU_VAR(cpu_current_top_of_stack), %rsp
|
||||
|
||||
/*
|
||||
* We have RDI, return address, and orig_ax on the stack on
|
||||
* top of the IRET frame. That means offset=24
|
||||
*/
|
||||
UNWIND_HINT_IRET_REGS base=%rdi offset=24
|
||||
|
||||
pushq 7*8(%rdi) /* regs->ss */
|
||||
pushq 6*8(%rdi) /* regs->rsp */
|
||||
pushq 5*8(%rdi) /* regs->eflags */
|
||||
pushq 4*8(%rdi) /* regs->cs */
|
||||
pushq 3*8(%rdi) /* regs->ip */
|
||||
UNWIND_HINT_IRET_REGS
|
||||
pushq 2*8(%rdi) /* regs->orig_ax */
|
||||
pushq 8(%rdi) /* return address */
|
||||
|
||||
movq (%rdi), %rdi
|
||||
jmp 2f
|
||||
1:
|
||||
FENCE_SWAPGS_KERNEL_ENTRY
|
||||
2:
|
||||
PUSH_AND_CLEAR_REGS save_ret=1
|
||||
ENCODE_FRAME_POINTER 8
|
||||
|
||||
testb $3, CS+8(%rsp)
|
||||
jz 1f
|
||||
|
||||
/*
|
||||
* IRQ from user mode.
|
||||
*
|
||||
* We need to tell lockdep that IRQs are off. We can't do this until
|
||||
* we fix gsbase, and we should do it before enter_from_user_mode
|
||||
* (which can take locks). Since TRACE_IRQS_OFF is idempotent,
|
||||
* the simplest way to handle it is to just call it twice if
|
||||
* we enter from user mode. There's no reason to optimize this since
|
||||
* TRACE_IRQS_OFF is a no-op if lockdep is off.
|
||||
*/
|
||||
TRACE_IRQS_OFF
|
||||
|
||||
CALL_enter_from_user_mode
|
||||
|
||||
1:
|
||||
ENTER_IRQ_STACK old_rsp=%rdi save_ret=1
|
||||
/* We entered an interrupt context - irqs are off: */
|
||||
TRACE_IRQS_OFF
|
||||
|
||||
ret
|
||||
SYM_CODE_END(interrupt_entry)
|
||||
_ASM_NOKPROBE(interrupt_entry)
|
||||
|
||||
SYM_CODE_START_LOCAL(common_interrupt_return)
|
||||
ret_from_intr:
|
||||
DISABLE_INTERRUPTS(CLBR_ANY)
|
||||
TRACE_IRQS_OFF
|
||||
|
||||
LEAVE_IRQ_STACK
|
||||
|
||||
testb $3, CS(%rsp)
|
||||
jz retint_kernel
|
||||
|
||||
/* Interrupt came from user space */
|
||||
.Lretint_user:
|
||||
mov %rsp,%rdi
|
||||
call prepare_exit_to_usermode
|
||||
|
||||
SYM_INNER_LABEL(swapgs_restore_regs_and_return_to_usermode, SYM_L_GLOBAL)
|
||||
#ifdef CONFIG_DEBUG_ENTRY
|
||||
/* Assert that pt_regs indicates user mode. */
|
||||
|
|
@ -802,23 +701,6 @@ SYM_INNER_LABEL(swapgs_restore_regs_and_return_to_usermode, SYM_L_GLOBAL)
|
|||
INTERRUPT_RETURN
|
||||
|
||||
|
||||
/* Returning to kernel space */
|
||||
retint_kernel:
|
||||
#ifdef CONFIG_PREEMPTION
|
||||
/* Interrupts are off */
|
||||
/* Check if we need preemption */
|
||||
btl $9, EFLAGS(%rsp) /* were interrupts off? */
|
||||
jnc 1f
|
||||
cmpl $0, PER_CPU_VAR(__preempt_count)
|
||||
jnz 1f
|
||||
call preempt_schedule_irq
|
||||
1:
|
||||
#endif
|
||||
/*
|
||||
* The iretq could re-enable interrupts:
|
||||
*/
|
||||
TRACE_IRQS_IRETQ
|
||||
|
||||
SYM_INNER_LABEL(restore_regs_and_return_to_kernel, SYM_L_GLOBAL)
|
||||
#ifdef CONFIG_DEBUG_ENTRY
|
||||
/* Assert that pt_regs indicates kernel mode. */
|
||||
|
|
@ -931,31 +813,6 @@ native_irq_return_ldt:
|
|||
SYM_CODE_END(common_interrupt_return)
|
||||
_ASM_NOKPROBE(common_interrupt_return)
|
||||
|
||||
/*
|
||||
* APIC interrupts.
|
||||
*/
|
||||
.macro apicinterrupt3 num sym do_sym
|
||||
SYM_CODE_START(\sym)
|
||||
UNWIND_HINT_IRET_REGS
|
||||
pushq $~(\num)
|
||||
call interrupt_entry
|
||||
UNWIND_HINT_REGS indirect=1
|
||||
call \do_sym /* rdi points to pt_regs */
|
||||
jmp ret_from_intr
|
||||
SYM_CODE_END(\sym)
|
||||
_ASM_NOKPROBE(\sym)
|
||||
.endm
|
||||
|
||||
/* Make sure APIC interrupt handlers end up in the irqentry section: */
|
||||
#define PUSH_SECTION_IRQENTRY .pushsection .irqentry.text, "ax"
|
||||
#define POP_SECTION_IRQENTRY .popsection
|
||||
|
||||
.macro apicinterrupt num sym do_sym
|
||||
PUSH_SECTION_IRQENTRY
|
||||
apicinterrupt3 \num \sym \do_sym
|
||||
POP_SECTION_IRQENTRY
|
||||
.endm
|
||||
|
||||
/*
|
||||
* Reload gs selector with exception handling
|
||||
* edi: new selector
|
||||
|
|
|
|||
|
|
@ -1,12 +0,0 @@
|
|||
/* SPDX-License-Identifier: GPL-2.0 */
|
||||
/*
|
||||
* This file is designed to contain the BUILD_INTERRUPT specifications for
|
||||
* all of the extra named interrupt vectors used by the architecture.
|
||||
* Usually this is the Inter Process Interrupts (IPIs)
|
||||
*/
|
||||
|
||||
/*
|
||||
* The following vectors are part of the Linux architecture, there
|
||||
* is no hardware IRQ pin equivalent for them, they are triggered
|
||||
* through the ICC by us (IPIs)
|
||||
*/
|
||||
|
|
@ -29,15 +29,16 @@
|
|||
#ifdef CONFIG_PARAVIRT_XXL
|
||||
#include <asm/asm-offsets.h>
|
||||
#include <asm/paravirt.h>
|
||||
#define GET_CR2_INTO(reg) GET_CR2_INTO_AX ; _ASM_MOV %_ASM_AX, reg
|
||||
#else
|
||||
#define INTERRUPT_RETURN iretq
|
||||
#define GET_CR2_INTO(reg) _ASM_MOV %cr2, reg
|
||||
#endif
|
||||
|
||||
/* we are not able to switch in one step to the final KERNEL ADDRESS SPACE
|
||||
/*
|
||||
* We are not able to switch in one step to the final KERNEL ADDRESS SPACE
|
||||
* because we need identity-mapped pages.
|
||||
*
|
||||
*/
|
||||
|
||||
#define l4_index(x) (((x) >> 39) & 511)
|
||||
#define pud_index(x) (((x) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user