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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: Glauber Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Glauber Costa 2008-08-14 17:33:12 -03:00 committed by Ingo Molnar
parent 2c44e66843
commit 097a0788df
1 changed files with 7 additions and 0 deletions
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7
arch/x86/kernel/entry_64.S
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@ -667,6 +667,13 @@ END(stub_rt_sigreturn)
SAVE_ARGS
leaq -ARGOFFSET(%rsp),%rdi # arg1 for handler
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_REL_OFFSET rbp, 0
movq %rsp,%rbp