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ftrace/x86_32: Simplify parameter setup for ftrace_regs_caller

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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>
This commit is contained in:
Uros Bizjak 2012-07-19 13:04:47 -04:00 committed by Steven Rostedt
parent 4de72395ff
commit e4ea3f6b1b
1 changed files with 2 additions and 3 deletions
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5
arch/x86/kernel/entry_32.S
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@ -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