x86/ptrace: Cleanup the definition of the pt_regs structure

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struct pt_regs is hard to read because the member or section related
comments are not aligned with the members.

The 'cs' and 'ss' members of pt_regs are type of 'unsigned long' while
in reality they are only 16-bit wide. This works so far as the
remaining space is unused, but FRED will use the remaining bits for
other purposes.

To prepare for FRED:

  - Cleanup the formatting
  - Convert 'cs' and 'ss' to u16 and embed them into an union
    with a u64
  - Fixup the related printk() format strings

Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Originally-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Signed-off-by: Xin Li <xin3.li@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Tested-by: Shan Kang <shan.kang@intel.com>
Link: https://lore.kernel.org/r/20231205105030.8698-14-xin3.li@intel.com

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This commit is contained in:

Xin Li 2023-12-05 02:50:02 -08:00 • committed by Borislav Petkov (AMD)

parent cd6df3f378

commit ee63291aa8

3 changed files with 37 additions and 15 deletions

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2

arch/x86/entry/vsyscall/vsyscall_64.c

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48

arch/x86/include/asm/ptrace.h

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2

arch/x86/kernel/process_64.c

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