forked from Minki/linux
79c5dca361
Add CFI annotations for native_{rd,wr}msr_safe_regs().
Simplify the 64-bit implementation: we don't allow the upper half
registers to be set, and so we can use them to carry state across the
operation.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: Borislav Petkov <petkovbb@gmail.com>
LKML-Reference: <1251705011-18636-1-git-send-email-petkovbb@gmail.com>
103 lines
1.9 KiB
ArmAsm
103 lines
1.9 KiB
ArmAsm
#include <linux/linkage.h>
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#include <linux/errno.h>
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#include <asm/dwarf2.h>
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#include <asm/asm.h>
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#include <asm/msr.h>
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#ifdef CONFIG_X86_64
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/*
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* int native_{rdmsr,wrmsr}_safe_regs(u32 gprs[8]);
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*
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* reg layout: u32 gprs[eax, ecx, edx, ebx, esp, ebp, esi, edi]
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*
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*/
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.macro op_safe_regs op:req
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ENTRY(native_\op\()_safe_regs)
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CFI_STARTPROC
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pushq_cfi %rbx
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pushq_cfi %rbp
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movq %rdi, %r10 /* Save pointer */
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xorl %r11d, %r11d /* Return value */
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movl (%rdi), %eax
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movl 4(%rdi), %ecx
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movl 8(%rdi), %edx
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movl 12(%rdi), %ebx
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movl 20(%rdi), %ebp
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movl 24(%rdi), %esi
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movl 28(%rdi), %edi
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CFI_REMEMBER_STATE
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1: \op
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2: movl %eax, (%r10)
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movl %r11d, %eax /* Return value */
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movl %ecx, 4(%r10)
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movl %edx, 8(%r10)
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movl %ebx, 12(%r10)
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movl %ebp, 20(%r10)
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movl %esi, 24(%r10)
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movl %edi, 28(%r10)
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popq_cfi %rbp
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popq_cfi %rbx
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ret
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3:
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CFI_RESTORE_STATE
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movl $-EIO, %r11d
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jmp 2b
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_ASM_EXTABLE(1b, 3b)
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CFI_ENDPROC
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ENDPROC(native_\op\()_safe_regs)
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.endm
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#else /* X86_32 */
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.macro op_safe_regs op:req
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ENTRY(native_\op\()_safe_regs)
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CFI_STARTPROC
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pushl_cfi %ebx
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pushl_cfi %ebp
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pushl_cfi %esi
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pushl_cfi %edi
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pushl_cfi $0 /* Return value */
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pushl_cfi %eax
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movl 4(%eax), %ecx
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movl 8(%eax), %edx
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movl 12(%eax), %ebx
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movl 20(%eax), %ebp
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movl 24(%eax), %esi
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movl 28(%eax), %edi
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movl (%eax), %eax
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CFI_REMEMBER_STATE
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1: \op
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2: pushl_cfi %eax
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movl 4(%esp), %eax
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popl_cfi (%eax)
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addl $4, %esp
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CFI_ADJUST_CFA_OFFSET -4
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movl %ecx, 4(%eax)
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movl %edx, 8(%eax)
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movl %ebx, 12(%eax)
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movl %ebp, 20(%eax)
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movl %esi, 24(%eax)
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movl %edi, 28(%eax)
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popl_cfi %eax
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popl_cfi %edi
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popl_cfi %esi
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popl_cfi %ebp
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popl_cfi %ebx
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ret
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3:
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CFI_RESTORE_STATE
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movl $-EIO, 4(%esp)
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jmp 2b
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_ASM_EXTABLE(1b, 3b)
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CFI_ENDPROC
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ENDPROC(native_\op\()_safe_regs)
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.endm
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#endif
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op_safe_regs rdmsr
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op_safe_regs wrmsr
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