mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-19 10:14:23 +08:00
cc456c4e7c
The git commite7a5cd063c7b4c58417f674821d63f5eb6747e37
("x86-64, gdt: Store/load GDT for ACPI S3 or hibernate/resume path
is not needed.") assumes that for the hibernate path the booting
kernel and the resuming kernel MUST be the same. That is certainly
the case for a 32-bit kernel (see check_image_kernel and
CONFIG_ARCH_HIBERNATION_HEADER config option).
However for 64-bit kernels it is OK to have a different kernel
version (and size of the image) of the booting and resuming kernels.
Hence the above mentioned git commit introduces an regression.
This patch fixes it by introducing a 'struct desc_ptr gdt_desc'
back in the 'struct saved_context'. However instead of having in the
'save_processor_state' and 'restore_processor_state' the
store/load_gdt calls, we are only saving the GDT in the
save_processor_state.
For the restore path the lgdt operation is done in
hibernate_asm_[32|64].S in the 'restore_registers' path.
The apt reader of this description will recognize that only 64-bit
kernels need this treatment, not 32-bit. This patch adds the logic
in the 32-bit path to be more similar to 64-bit so that in the future
the unification process can take advantage of this.
[ hpa: this also reverts an inadvertent on-disk format change ]
Suggested-by: "H. Peter Anvin" <hpa@zytor.com>
Acked-by: "Rafael J. Wysocki" <rjw@sisk.pl>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Link: http://lkml.kernel.org/r/1367459610-9656-2-git-send-email-konrad.wilk@oracle.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
91 lines
1.9 KiB
C
91 lines
1.9 KiB
C
#include <asm/ia32.h>
|
|
|
|
#define __SYSCALL_64(nr, sym, compat) [nr] = 1,
|
|
#define __SYSCALL_COMMON(nr, sym, compat) [nr] = 1,
|
|
#ifdef CONFIG_X86_X32_ABI
|
|
# define __SYSCALL_X32(nr, sym, compat) [nr] = 1,
|
|
#else
|
|
# define __SYSCALL_X32(nr, sym, compat) /* nothing */
|
|
#endif
|
|
static char syscalls_64[] = {
|
|
#include <asm/syscalls_64.h>
|
|
};
|
|
#define __SYSCALL_I386(nr, sym, compat) [nr] = 1,
|
|
static char syscalls_ia32[] = {
|
|
#include <asm/syscalls_32.h>
|
|
};
|
|
|
|
int main(void)
|
|
{
|
|
#ifdef CONFIG_PARAVIRT
|
|
OFFSET(PV_IRQ_adjust_exception_frame, pv_irq_ops, adjust_exception_frame);
|
|
OFFSET(PV_CPU_usergs_sysret32, pv_cpu_ops, usergs_sysret32);
|
|
OFFSET(PV_CPU_usergs_sysret64, pv_cpu_ops, usergs_sysret64);
|
|
OFFSET(PV_CPU_swapgs, pv_cpu_ops, swapgs);
|
|
BLANK();
|
|
#endif
|
|
|
|
#ifdef CONFIG_IA32_EMULATION
|
|
OFFSET(TI_sysenter_return, thread_info, sysenter_return);
|
|
BLANK();
|
|
|
|
#define ENTRY(entry) OFFSET(IA32_SIGCONTEXT_ ## entry, sigcontext_ia32, entry)
|
|
ENTRY(ax);
|
|
ENTRY(bx);
|
|
ENTRY(cx);
|
|
ENTRY(dx);
|
|
ENTRY(si);
|
|
ENTRY(di);
|
|
ENTRY(bp);
|
|
ENTRY(sp);
|
|
ENTRY(ip);
|
|
BLANK();
|
|
#undef ENTRY
|
|
|
|
OFFSET(IA32_RT_SIGFRAME_sigcontext, rt_sigframe_ia32, uc.uc_mcontext);
|
|
BLANK();
|
|
#endif
|
|
|
|
#define ENTRY(entry) OFFSET(pt_regs_ ## entry, pt_regs, entry)
|
|
ENTRY(bx);
|
|
ENTRY(bx);
|
|
ENTRY(cx);
|
|
ENTRY(dx);
|
|
ENTRY(sp);
|
|
ENTRY(bp);
|
|
ENTRY(si);
|
|
ENTRY(di);
|
|
ENTRY(r8);
|
|
ENTRY(r9);
|
|
ENTRY(r10);
|
|
ENTRY(r11);
|
|
ENTRY(r12);
|
|
ENTRY(r13);
|
|
ENTRY(r14);
|
|
ENTRY(r15);
|
|
ENTRY(flags);
|
|
BLANK();
|
|
#undef ENTRY
|
|
|
|
#define ENTRY(entry) OFFSET(saved_context_ ## entry, saved_context, entry)
|
|
ENTRY(cr0);
|
|
ENTRY(cr2);
|
|
ENTRY(cr3);
|
|
ENTRY(cr4);
|
|
ENTRY(cr8);
|
|
ENTRY(gdt_desc);
|
|
BLANK();
|
|
#undef ENTRY
|
|
|
|
OFFSET(TSS_ist, tss_struct, x86_tss.ist);
|
|
BLANK();
|
|
|
|
DEFINE(__NR_syscall_max, sizeof(syscalls_64) - 1);
|
|
DEFINE(NR_syscalls, sizeof(syscalls_64));
|
|
|
|
DEFINE(__NR_ia32_syscall_max, sizeof(syscalls_ia32) - 1);
|
|
DEFINE(IA32_NR_syscalls, sizeof(syscalls_ia32));
|
|
|
|
return 0;
|
|
}
|