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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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c207aee480
In preparation for an objtool rewrite which will have broader checks, whitelist functions and files which cause problems because they do unusual things with the stack. These whitelists serve as a TODO list for which functions and files don't yet have undwarf unwinder coverage. Eventually most of the whitelists can be removed in favor of manual CFI hint annotations or objtool improvements. Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Jiri Slaby <jslaby@suse.cz> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: live-patching@vger.kernel.org Link: http://lkml.kernel.org/r/7f934a5d707a574bda33ea282e9478e627fb1829.1498659915.git.jpoimboe@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
92 lines
1.6 KiB
ArmAsm
92 lines
1.6 KiB
ArmAsm
#include <linux/linkage.h>
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#include <linux/errno.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 {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
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ENTRY(\op\()_safe_regs)
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pushq %rbx
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pushq %r12
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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), %r12d
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movl 24(%rdi), %esi
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movl 28(%rdi), %edi
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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 %r12d, 20(%r10)
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movl %esi, 24(%r10)
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movl %edi, 28(%r10)
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popq %r12
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popq %rbx
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ret
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3:
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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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ENDPROC(\op\()_safe_regs)
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.endm
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#else /* X86_32 */
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.macro op_safe_regs op
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ENTRY(\op\()_safe_regs)
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pushl %ebx
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pushl %ebp
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pushl %esi
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pushl %edi
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pushl $0 /* Return value */
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pushl %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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1: \op
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2: pushl %eax
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movl 4(%esp), %eax
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popl (%eax)
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addl $4, %esp
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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 %eax
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popl %edi
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popl %esi
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popl %ebp
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popl %ebx
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ret
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3:
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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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ENDPROC(\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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