forked from luck/tmp_suning_uos_patched
559ceeed62
bogus_64_magic is only a dead-end loop. There is no need for an out-of-order function (and unannotated local label), so just handle it in-place and also store 0xbad-m-a-g-i-c to %rcx beforehand, in case someone is inspecting registers. Here a qemu+gdb example: Remote debugging using localhost:1235 wakeup_long64 () at arch/x86/kernel/acpi/wakeup_64.S:26 26 jmp 1b (gdb) info registers rax 0x123456789abcdef0 1311768467463790320 rbx 0x0 0 rcx 0xbad6d61676963 3286910041024867 ^^^^^^^^^^^^^^^ [ bp: Add the gdb example. ] Signed-off-by: Jiri Slaby <jslaby@suse.cz> Signed-off-by: Borislav Petkov <bp@suse.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Len Brown <lenb@kernel.org> Cc: linux-pm@vger.kernel.org Cc: Pavel Machek <pavel@ucw.cz> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: x86-ml <x86@kernel.org> Link: https://lkml.kernel.org/r/20190906075550.23435-1-jslaby@suse.cz
140 lines
2.9 KiB
ArmAsm
140 lines
2.9 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
.text
|
|
#include <linux/linkage.h>
|
|
#include <asm/segment.h>
|
|
#include <asm/pgtable_types.h>
|
|
#include <asm/page_types.h>
|
|
#include <asm/msr.h>
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm/frame.h>
|
|
|
|
# Copyright 2003 Pavel Machek <pavel@suse.cz
|
|
|
|
.code64
|
|
/*
|
|
* Hooray, we are in Long 64-bit mode (but still running in low memory)
|
|
*/
|
|
ENTRY(wakeup_long64)
|
|
movq saved_magic, %rax
|
|
movq $0x123456789abcdef0, %rdx
|
|
cmpq %rdx, %rax
|
|
je 2f
|
|
|
|
/* stop here on a saved_magic mismatch */
|
|
movq $0xbad6d61676963, %rcx
|
|
1:
|
|
jmp 1b
|
|
2:
|
|
movw $__KERNEL_DS, %ax
|
|
movw %ax, %ss
|
|
movw %ax, %ds
|
|
movw %ax, %es
|
|
movw %ax, %fs
|
|
movw %ax, %gs
|
|
movq saved_rsp, %rsp
|
|
|
|
movq saved_rbx, %rbx
|
|
movq saved_rdi, %rdi
|
|
movq saved_rsi, %rsi
|
|
movq saved_rbp, %rbp
|
|
|
|
movq saved_rip, %rax
|
|
jmp *%rax
|
|
ENDPROC(wakeup_long64)
|
|
|
|
ENTRY(do_suspend_lowlevel)
|
|
FRAME_BEGIN
|
|
subq $8, %rsp
|
|
xorl %eax, %eax
|
|
call save_processor_state
|
|
|
|
movq $saved_context, %rax
|
|
movq %rsp, pt_regs_sp(%rax)
|
|
movq %rbp, pt_regs_bp(%rax)
|
|
movq %rsi, pt_regs_si(%rax)
|
|
movq %rdi, pt_regs_di(%rax)
|
|
movq %rbx, pt_regs_bx(%rax)
|
|
movq %rcx, pt_regs_cx(%rax)
|
|
movq %rdx, pt_regs_dx(%rax)
|
|
movq %r8, pt_regs_r8(%rax)
|
|
movq %r9, pt_regs_r9(%rax)
|
|
movq %r10, pt_regs_r10(%rax)
|
|
movq %r11, pt_regs_r11(%rax)
|
|
movq %r12, pt_regs_r12(%rax)
|
|
movq %r13, pt_regs_r13(%rax)
|
|
movq %r14, pt_regs_r14(%rax)
|
|
movq %r15, pt_regs_r15(%rax)
|
|
pushfq
|
|
popq pt_regs_flags(%rax)
|
|
|
|
movq $.Lresume_point, saved_rip(%rip)
|
|
|
|
movq %rsp, saved_rsp
|
|
movq %rbp, saved_rbp
|
|
movq %rbx, saved_rbx
|
|
movq %rdi, saved_rdi
|
|
movq %rsi, saved_rsi
|
|
|
|
addq $8, %rsp
|
|
movl $3, %edi
|
|
xorl %eax, %eax
|
|
call x86_acpi_enter_sleep_state
|
|
/* in case something went wrong, restore the machine status and go on */
|
|
jmp .Lresume_point
|
|
|
|
.align 4
|
|
.Lresume_point:
|
|
/* We don't restore %rax, it must be 0 anyway */
|
|
movq $saved_context, %rax
|
|
movq saved_context_cr4(%rax), %rbx
|
|
movq %rbx, %cr4
|
|
movq saved_context_cr3(%rax), %rbx
|
|
movq %rbx, %cr3
|
|
movq saved_context_cr2(%rax), %rbx
|
|
movq %rbx, %cr2
|
|
movq saved_context_cr0(%rax), %rbx
|
|
movq %rbx, %cr0
|
|
pushq pt_regs_flags(%rax)
|
|
popfq
|
|
movq pt_regs_sp(%rax), %rsp
|
|
movq pt_regs_bp(%rax), %rbp
|
|
movq pt_regs_si(%rax), %rsi
|
|
movq pt_regs_di(%rax), %rdi
|
|
movq pt_regs_bx(%rax), %rbx
|
|
movq pt_regs_cx(%rax), %rcx
|
|
movq pt_regs_dx(%rax), %rdx
|
|
movq pt_regs_r8(%rax), %r8
|
|
movq pt_regs_r9(%rax), %r9
|
|
movq pt_regs_r10(%rax), %r10
|
|
movq pt_regs_r11(%rax), %r11
|
|
movq pt_regs_r12(%rax), %r12
|
|
movq pt_regs_r13(%rax), %r13
|
|
movq pt_regs_r14(%rax), %r14
|
|
movq pt_regs_r15(%rax), %r15
|
|
|
|
#ifdef CONFIG_KASAN
|
|
/*
|
|
* The suspend path may have poisoned some areas deeper in the stack,
|
|
* which we now need to unpoison.
|
|
*/
|
|
movq %rsp, %rdi
|
|
call kasan_unpoison_task_stack_below
|
|
#endif
|
|
|
|
xorl %eax, %eax
|
|
addq $8, %rsp
|
|
FRAME_END
|
|
jmp restore_processor_state
|
|
ENDPROC(do_suspend_lowlevel)
|
|
|
|
.data
|
|
saved_rbp: .quad 0
|
|
saved_rsi: .quad 0
|
|
saved_rdi: .quad 0
|
|
saved_rbx: .quad 0
|
|
|
|
saved_rip: .quad 0
|
|
saved_rsp: .quad 0
|
|
|
|
ENTRY(saved_magic) .quad 0
|