linux/arch/x86/lib/msr-reg.S
Andre Przywara 1f975f78c8 x86, pvops: Remove hooks for {rd,wr}msr_safe_regs
There were paravirt_ops hooks for the full register set variant of
{rd,wr}msr_safe which are actually not used by anyone anymore. Remove
them to make the code cleaner and avoid silent breakages when the pvops
members were uninitialized. This has been boot-tested natively and under
Xen with PVOPS enabled and disabled on one machine.

Signed-off-by: Andre Przywara <andre.przywara@amd.com>
Link: http://lkml.kernel.org/r/1338562358-28182-2-git-send-email-bp@amd64.org
Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
2012-06-07 11:41:08 -07:00

102 lines
1.8 KiB
ArmAsm

#include <linux/linkage.h>
#include <linux/errno.h>
#include <asm/dwarf2.h>
#include <asm/asm.h>
#include <asm/msr.h>
#ifdef CONFIG_X86_64
/*
* int {rdmsr,wrmsr}_safe_regs(u32 gprs[8]);
*
* reg layout: u32 gprs[eax, ecx, edx, ebx, esp, ebp, esi, edi]
*
*/
.macro op_safe_regs op
ENTRY(\op\()_safe_regs)
CFI_STARTPROC
pushq_cfi %rbx
pushq_cfi %rbp
movq %rdi, %r10 /* Save pointer */
xorl %r11d, %r11d /* Return value */
movl (%rdi), %eax
movl 4(%rdi), %ecx
movl 8(%rdi), %edx
movl 12(%rdi), %ebx
movl 20(%rdi), %ebp
movl 24(%rdi), %esi
movl 28(%rdi), %edi
CFI_REMEMBER_STATE
1: \op
2: movl %eax, (%r10)
movl %r11d, %eax /* Return value */
movl %ecx, 4(%r10)
movl %edx, 8(%r10)
movl %ebx, 12(%r10)
movl %ebp, 20(%r10)
movl %esi, 24(%r10)
movl %edi, 28(%r10)
popq_cfi %rbp
popq_cfi %rbx
ret
3:
CFI_RESTORE_STATE
movl $-EIO, %r11d
jmp 2b
_ASM_EXTABLE(1b, 3b)
CFI_ENDPROC
ENDPROC(\op\()_safe_regs)
.endm
#else /* X86_32 */
.macro op_safe_regs op
ENTRY(\op\()_safe_regs)
CFI_STARTPROC
pushl_cfi %ebx
pushl_cfi %ebp
pushl_cfi %esi
pushl_cfi %edi
pushl_cfi $0 /* Return value */
pushl_cfi %eax
movl 4(%eax), %ecx
movl 8(%eax), %edx
movl 12(%eax), %ebx
movl 20(%eax), %ebp
movl 24(%eax), %esi
movl 28(%eax), %edi
movl (%eax), %eax
CFI_REMEMBER_STATE
1: \op
2: pushl_cfi %eax
movl 4(%esp), %eax
popl_cfi (%eax)
addl $4, %esp
CFI_ADJUST_CFA_OFFSET -4
movl %ecx, 4(%eax)
movl %edx, 8(%eax)
movl %ebx, 12(%eax)
movl %ebp, 20(%eax)
movl %esi, 24(%eax)
movl %edi, 28(%eax)
popl_cfi %eax
popl_cfi %edi
popl_cfi %esi
popl_cfi %ebp
popl_cfi %ebx
ret
3:
CFI_RESTORE_STATE
movl $-EIO, 4(%esp)
jmp 2b
_ASM_EXTABLE(1b, 3b)
CFI_ENDPROC
ENDPROC(\op\()_safe_regs)
.endm
#endif
op_safe_regs rdmsr
op_safe_regs wrmsr