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| author |   Uros Bizjak <ubizjak@gmail.com> | 2012-07-19 13:04:47 -0400 |
|---|---|---|
| committer |   Steven Rostedt <rostedt@goodmis.org> | 2012-07-31 10:29:34 -0400 |
| commit | e4ea3f6b1bf3d489674a3660db652636e50186f9 (patch) | |
| tree | 87ac8c2d28fc1b4394eb7aedd937a96dd2de7abf /arch/x86/kernel/entry_32.S | |
| parent | ftrace/x86: Add save_regs for i386 function calls (diff) | |
| download | linux-dev-e4ea3f6b1bf3d489674a3660db652636e50186f9.tar.xz linux-dev-e4ea3f6b1bf3d489674a3660db652636e50186f9.zip | |
ftrace/x86_32: Simplify parameter setup for ftrace_regs_caller
The final position of the stack after saving regs and setting up
the parameters for ftrace_regs_call, is the position of the pt_regs
needed for the 4th parameter. Instead of saving it into a temporary
reg and pushing the reg, simply push the stack pointer.
Link: http://lkml.kernel.org/r/1342702344.12353.16.camel@gandalf.stny.rr.com
Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'arch/x86/kernel/entry_32.S')
| -rw-r--r-- | arch/x86/kernel/entry_32.S | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S index 46caa5649a5e..4dc301709e78 100644 --- a/arch/x86/kernel/entry_32.S +++ b/arch/x86/kernel/entry_32.S @@ -1169,10 +1169,9 @@ ENTRY(ftrace_regs_caller) movl $__KERNEL_CS,13*4(%esp) movl 12*4(%esp), %eax /* Load ip (1st parameter) */ - movl 0x4(%ebp), %edx /* Load parent ip (2cd parameter) */ - lea (%esp), %ecx - pushl %ecx /* Save pt_regs as 4th parameter */ + movl 0x4(%ebp), %edx /* Load parent ip (2nd parameter) */ leal function_trace_op, %ecx /* Save ftrace_pos in 3rd parameter */ + pushl %esp /* Save pt_regs as 4th parameter */ GLOBAL(ftrace_regs_call) call ftrace_stub |