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Commit 097a0788 authored by Glauber Costa's avatar Glauber Costa Committed by Ingo Molnar
Browse files

x86: set bp field in pt_regs properly 



Save rbp twice: One is for marking the stack frame, as usual (already
there), and the other, to fill pt_regs properly. This is because bx
comes right before the last saved register in that structure, and not
bp. If the base pointer were in the place bx is today, this would not
be needed.

Signed-off-by: default avatarGlauber Costa <gcosta@redhat.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 2c44e668

arch/x86/kernel/entry_64.S

+7 −0
Original line number Original line Diff line number Diff line
@@ -667,6 +667,13 @@ END(stub_rt_sigreturn) 
	SAVE_ARGS

	SAVE_ARGS

	leaq -ARGOFFSET(%rsp),%rdi	# arg1 for handler

	leaq -ARGOFFSET(%rsp),%rdi	# arg1 for handler

	pushq %rbp

	pushq %rbp

	/*

	 * Save rbp twice: One is for marking the stack frame, as usual, and the

	 * other, to fill pt_regs properly. This is because bx comes right

	 * before the last saved register in that structure, and not bp. If the

	 * base pointer were in the place bx is today, this would not be needed.

	 */

	movq %rbp, -8(%rsp)

	CFI_ADJUST_CFA_OFFSET	8

	CFI_ADJUST_CFA_OFFSET	8

	CFI_REL_OFFSET		rbp, 0

	CFI_REL_OFFSET		rbp, 0

	movq %rsp,%rbp

	movq %rsp,%rbp