mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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8539d3f067
Drop the GAS-compatible RDPID macro. RDPID is unsafe in the kernel
because KVM loads guest's TSC_AUX on VM-entry and may not restore the
host's value until the CPU returns to userspace.
See
6a3ea3e68b ("x86/entry/64: Do not use RDPID in paranoid entry to accomodate KVM")
for details.
It can always be resurrected from git history, if needed.
[ bp: Massage commit message. ]
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20201027214532.1792-1-sean.j.christopherson@intel.com
148 lines
2 KiB
C
148 lines
2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Generate .byte code for some instructions not supported by old
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* binutils.
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*/
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#ifndef X86_ASM_INST_H
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#define X86_ASM_INST_H
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#ifdef __ASSEMBLY__
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#define REG_NUM_INVALID 100
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#define REG_TYPE_R32 0
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#define REG_TYPE_R64 1
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#define REG_TYPE_INVALID 100
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.macro R32_NUM opd r32
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\opd = REG_NUM_INVALID
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.ifc \r32,%eax
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\opd = 0
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.endif
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.ifc \r32,%ecx
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\opd = 1
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.endif
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.ifc \r32,%edx
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\opd = 2
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.endif
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.ifc \r32,%ebx
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\opd = 3
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.endif
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.ifc \r32,%esp
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\opd = 4
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.endif
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.ifc \r32,%ebp
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\opd = 5
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.endif
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.ifc \r32,%esi
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\opd = 6
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.endif
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.ifc \r32,%edi
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\opd = 7
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.endif
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#ifdef CONFIG_X86_64
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.ifc \r32,%r8d
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\opd = 8
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.endif
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.ifc \r32,%r9d
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\opd = 9
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.endif
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.ifc \r32,%r10d
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\opd = 10
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.endif
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.ifc \r32,%r11d
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\opd = 11
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.endif
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.ifc \r32,%r12d
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\opd = 12
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.endif
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.ifc \r32,%r13d
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\opd = 13
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.endif
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.ifc \r32,%r14d
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\opd = 14
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.endif
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.ifc \r32,%r15d
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\opd = 15
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.endif
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#endif
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.endm
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.macro R64_NUM opd r64
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\opd = REG_NUM_INVALID
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#ifdef CONFIG_X86_64
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.ifc \r64,%rax
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\opd = 0
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.endif
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.ifc \r64,%rcx
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\opd = 1
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.endif
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.ifc \r64,%rdx
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\opd = 2
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.endif
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.ifc \r64,%rbx
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\opd = 3
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.endif
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.ifc \r64,%rsp
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\opd = 4
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.endif
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.ifc \r64,%rbp
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\opd = 5
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.endif
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.ifc \r64,%rsi
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\opd = 6
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.endif
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.ifc \r64,%rdi
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\opd = 7
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.endif
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.ifc \r64,%r8
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\opd = 8
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.endif
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.ifc \r64,%r9
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\opd = 9
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.endif
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.ifc \r64,%r10
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\opd = 10
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.endif
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.ifc \r64,%r11
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\opd = 11
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.endif
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.ifc \r64,%r12
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\opd = 12
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.endif
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.ifc \r64,%r13
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\opd = 13
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.endif
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.ifc \r64,%r14
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\opd = 14
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.endif
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.ifc \r64,%r15
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\opd = 15
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.endif
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#endif
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.endm
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.macro REG_TYPE type reg
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R32_NUM reg_type_r32 \reg
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R64_NUM reg_type_r64 \reg
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.if reg_type_r64 <> REG_NUM_INVALID
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\type = REG_TYPE_R64
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.elseif reg_type_r32 <> REG_NUM_INVALID
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\type = REG_TYPE_R32
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.else
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\type = REG_TYPE_INVALID
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.endif
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.endm
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.macro PFX_REX opd1 opd2 W=0
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.if ((\opd1 | \opd2) & 8) || \W
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.byte 0x40 | ((\opd1 & 8) >> 3) | ((\opd2 & 8) >> 1) | (\W << 3)
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.endif
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.endm
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.macro MODRM mod opd1 opd2
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.byte \mod | (\opd1 & 7) | ((\opd2 & 7) << 3)
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.endm
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#endif
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#endif
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