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>

diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index cf3a0b2d00599adb2a79fefa991c0d8223059fba..25bb3f9b25527bc55ea01496a53e9bf727e6a289 100644 (file)
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -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