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authorSteven Rostedt <rostedt@goodmis.org>2013-11-13 15:20:04 -0500
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-01-25 08:27:11 -0800
commitb2be7cd9d11dde01e7c8ae39fe428d8df0aa8c6c (patch)
treeb0995f10ba3a92ebcd093b8b6d996a8240fb6b37
parent057f2f7daf84356c8677f2458395d250c4c0674f (diff)
downloadlinaro-lsk-b2be7cd9d11dde01e7c8ae39fe428d8df0aa8c6c.tar.gz
ftrace/x86: Load ftrace_ops in parameter not the variable holding it
commit 1739f09e33d8f66bf48ddbc3eca615574da6c4f6 upstream. Function tracing callbacks expect to have the ftrace_ops that registered it passed to them, not the address of the variable that holds the ftrace_ops that registered it. Use a mov instead of a lea to store the ftrace_ops into the parameter of the function tracing callback. Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Link: http://lkml.kernel.org/r/20131113152004.459787f9@gandalf.local.home Signed-off-by: H. Peter Anvin <hpa@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--arch/x86/kernel/entry_32.S4
-rw-r--r--arch/x86/kernel/entry_64.S2
2 files changed, 3 insertions, 3 deletions
diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S
index 8f3e2dec1df..94e52cf064b 100644
--- a/arch/x86/kernel/entry_32.S
+++ b/arch/x86/kernel/entry_32.S
@@ -1075,7 +1075,7 @@ ENTRY(ftrace_caller)
pushl $0 /* Pass NULL as regs pointer */
movl 4*4(%esp), %eax
movl 0x4(%ebp), %edx
- leal function_trace_op, %ecx
+ movl function_trace_op, %ecx
subl $MCOUNT_INSN_SIZE, %eax
.globl ftrace_call
@@ -1133,7 +1133,7 @@ ENTRY(ftrace_regs_caller)
movl 12*4(%esp), %eax /* Load ip (1st parameter) */
subl $MCOUNT_INSN_SIZE, %eax /* Adjust ip */
movl 0x4(%ebp), %edx /* Load parent ip (2nd parameter) */
- leal function_trace_op, %ecx /* Save ftrace_pos in 3rd parameter */
+ movl function_trace_op, %ecx /* Save ftrace_pos in 3rd parameter */
pushl %esp /* Save pt_regs as 4th parameter */
GLOBAL(ftrace_regs_call)
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index 72720894103..7ac938a4bfa 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -88,7 +88,7 @@ END(function_hook)
MCOUNT_SAVE_FRAME \skip
/* Load the ftrace_ops into the 3rd parameter */
- leaq function_trace_op, %rdx
+ movq function_trace_op(%rip), %rdx
/* Load ip into the first parameter */
movq RIP(%rsp), %rdi