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| author | Donglin Peng <pengdonglin@sangfor.com.cn> | 2023-04-08 05:42:20 -0700 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2023-06-20 18:38:38 -0400 |
| commit | d938ba17683effd95b44400d30df16fe541f40fd (patch) | |
| tree | 9e97f4c3d84f75dc701e6cdbac69f39e6f426498 /arch/x86/kernel/ftrace_32.S | |
| parent | 3646970322464c21e69dcb9a2e37d461c5834bf5 (diff) | |
| download | lwn-d938ba17683effd95b44400d30df16fe541f40fd.tar.gz lwn-d938ba17683effd95b44400d30df16fe541f40fd.zip | |
x86/ftrace: Enable HAVE_FUNCTION_GRAPH_RETVAL
The previous patch ("function_graph: Support recording and printing
the return value of function") has laid the groundwork for the for
the funcgraph-retval, and this modification makes it available on
the x86 platform.
We introduce a new structure called fgraph_ret_regs for the x86
platform to hold return registers and the frame pointer. We then
fill its content in the return_to_handler and pass its address
to the function ftrace_return_to_handler to record the return
value.
Link: https://lkml.kernel.org/r/53a506f0f18ff4b7aeb0feb762f1c9a5e9b83ee9.1680954589.git.pengdonglin@sangfor.com.cn
Signed-off-by: Donglin Peng <pengdonglin@sangfor.com.cn>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'arch/x86/kernel/ftrace_32.S')
| -rw-r--r-- | arch/x86/kernel/ftrace_32.S | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/arch/x86/kernel/ftrace_32.S b/arch/x86/kernel/ftrace_32.S index 0d9a14528176..24c1175a47e2 100644 --- a/arch/x86/kernel/ftrace_32.S +++ b/arch/x86/kernel/ftrace_32.S @@ -187,12 +187,14 @@ SYM_CODE_END(ftrace_graph_caller) .globl return_to_handler return_to_handler: - pushl %eax + pushl $0 pushl %edx - movl $0, %eax + pushl %eax + movl %esp, %eax call ftrace_return_to_handler movl %eax, %ecx - popl %edx popl %eax + popl %edx + addl $4, %esp # skip ebp JMP_NOSPEC ecx #endif |