This implements functions related to signal bh on x86-64.
Signed-off-by: Eduard - Gabriel Munteanu <eduard.munte...@linux360.ro>
---
arch/x86/signal-bh.S | 55 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 55 insertions(+), 0 deletions(-)
diff --git a/arch/x86/signal-bh.S b/arch/x86/signal-bh.S
index c63f853..beb1f65 100644
--- a/arch/x86/signal-bh.S
+++ b/arch/x86/signal-bh.S
@@ -3,6 +3,8 @@
.global signal_bh_trampoline
.text
+#ifdef CONFIG_X86_32
+
/*
* signal_bh_trampoline - saves the caller saved registers and calls
* signal bottom half hanlder.
@@ -46,3 +48,56 @@ signal_bh_trampoline:
*/
addl $0x04, %esp
ret
+
+#else /* CONFIG_X86_32 */
+
+/*
+ * signal_bh_trampoline - saves the caller saved registers and calls
+ * signal bottom half hanlder.
+ */
+signal_bh_trampoline:
+ push %rbp
+ movq %rsp, %rbp
+
+ /* save caller saved registers */
+ push %rax
+ push %rdi
+ push %rsi
+ push %rdx
+ push %rcx
+ push %r8
+ push %r9
+
+ /* push signal bottom half handler's argument - address of
+ faulting instruction. */
+ movq 0x08(%rbp), %rdi
+
+ /* call the signal bottom half handler */
+ push $.bh_return
+ push 0x10(%rbp)
+ ret
+
+.bh_return:
+ /* overwrite return address */
+ movq %rax, 0x10(%rbp)
+
+ /* restore caller saved registers */
+ pop %r9
+ pop %r8
+ pop %rcx
+ pop %rdx
+ pop %rsi
+ pop %rdi
+ pop %rax
+
+ pop %rbp
+
+ /*
+ * Cleanup bottom half handler address pushed by signal_install_bh().
+ * We do this by popping the return address from stack into
+ * the call argument.
+ */
+ addq $0x08, %rsp
+ ret
+
+#endif /* CONFIG_X86_32 */
--
1.6.0.6
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