mirror of
https://github.com/torvalds/linux.git
synced 2024-11-16 17:12:06 +00:00
fdc841b58c
Nothing sets function_trace_stop to disable function tracing anymore. Remove the check for it in the arch code. Link: http://lkml.kernel.org/r/53C54D32.6000000@zytor.com Acked-by: H. Peter Anvin <hpa@linux.intel.com> Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
207 lines
3.6 KiB
ArmAsm
207 lines
3.6 KiB
ArmAsm
/*
|
|
* linux/arch/x86_64/mcount_64.S
|
|
*
|
|
* Copyright (C) 2014 Steven Rostedt, Red Hat Inc
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <asm/ptrace.h>
|
|
#include <asm/ftrace.h>
|
|
|
|
|
|
.code64
|
|
.section .entry.text, "ax"
|
|
|
|
|
|
#ifdef CONFIG_FUNCTION_TRACER
|
|
|
|
#ifdef CC_USING_FENTRY
|
|
# define function_hook __fentry__
|
|
#else
|
|
# define function_hook mcount
|
|
#endif
|
|
|
|
#ifdef CONFIG_DYNAMIC_FTRACE
|
|
|
|
ENTRY(function_hook)
|
|
retq
|
|
END(function_hook)
|
|
|
|
/* skip is set if stack has been adjusted */
|
|
.macro ftrace_caller_setup skip=0
|
|
MCOUNT_SAVE_FRAME \skip
|
|
|
|
/* Load the ftrace_ops into the 3rd parameter */
|
|
movq function_trace_op(%rip), %rdx
|
|
|
|
/* Load ip into the first parameter */
|
|
movq RIP(%rsp), %rdi
|
|
subq $MCOUNT_INSN_SIZE, %rdi
|
|
/* Load the parent_ip into the second parameter */
|
|
#ifdef CC_USING_FENTRY
|
|
movq SS+16(%rsp), %rsi
|
|
#else
|
|
movq 8(%rbp), %rsi
|
|
#endif
|
|
.endm
|
|
|
|
ENTRY(ftrace_caller)
|
|
ftrace_caller_setup
|
|
/* regs go into 4th parameter (but make it NULL) */
|
|
movq $0, %rcx
|
|
|
|
GLOBAL(ftrace_call)
|
|
call ftrace_stub
|
|
|
|
MCOUNT_RESTORE_FRAME
|
|
ftrace_return:
|
|
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
GLOBAL(ftrace_graph_call)
|
|
jmp ftrace_stub
|
|
#endif
|
|
|
|
GLOBAL(ftrace_stub)
|
|
retq
|
|
END(ftrace_caller)
|
|
|
|
ENTRY(ftrace_regs_caller)
|
|
/* Save the current flags before compare (in SS location)*/
|
|
pushfq
|
|
|
|
/* skip=8 to skip flags saved in SS */
|
|
ftrace_caller_setup 8
|
|
|
|
/* Save the rest of pt_regs */
|
|
movq %r15, R15(%rsp)
|
|
movq %r14, R14(%rsp)
|
|
movq %r13, R13(%rsp)
|
|
movq %r12, R12(%rsp)
|
|
movq %r11, R11(%rsp)
|
|
movq %r10, R10(%rsp)
|
|
movq %rbp, RBP(%rsp)
|
|
movq %rbx, RBX(%rsp)
|
|
/* Copy saved flags */
|
|
movq SS(%rsp), %rcx
|
|
movq %rcx, EFLAGS(%rsp)
|
|
/* Kernel segments */
|
|
movq $__KERNEL_DS, %rcx
|
|
movq %rcx, SS(%rsp)
|
|
movq $__KERNEL_CS, %rcx
|
|
movq %rcx, CS(%rsp)
|
|
/* Stack - skipping return address */
|
|
leaq SS+16(%rsp), %rcx
|
|
movq %rcx, RSP(%rsp)
|
|
|
|
/* regs go into 4th parameter */
|
|
leaq (%rsp), %rcx
|
|
|
|
GLOBAL(ftrace_regs_call)
|
|
call ftrace_stub
|
|
|
|
/* Copy flags back to SS, to restore them */
|
|
movq EFLAGS(%rsp), %rax
|
|
movq %rax, SS(%rsp)
|
|
|
|
/* Handlers can change the RIP */
|
|
movq RIP(%rsp), %rax
|
|
movq %rax, SS+8(%rsp)
|
|
|
|
/* restore the rest of pt_regs */
|
|
movq R15(%rsp), %r15
|
|
movq R14(%rsp), %r14
|
|
movq R13(%rsp), %r13
|
|
movq R12(%rsp), %r12
|
|
movq R10(%rsp), %r10
|
|
movq RBP(%rsp), %rbp
|
|
movq RBX(%rsp), %rbx
|
|
|
|
/* skip=8 to skip flags saved in SS */
|
|
MCOUNT_RESTORE_FRAME 8
|
|
|
|
/* Restore flags */
|
|
popfq
|
|
|
|
jmp ftrace_return
|
|
|
|
popfq
|
|
jmp ftrace_stub
|
|
|
|
END(ftrace_regs_caller)
|
|
|
|
|
|
#else /* ! CONFIG_DYNAMIC_FTRACE */
|
|
|
|
ENTRY(function_hook)
|
|
cmpq $ftrace_stub, ftrace_trace_function
|
|
jnz trace
|
|
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
cmpq $ftrace_stub, ftrace_graph_return
|
|
jnz ftrace_graph_caller
|
|
|
|
cmpq $ftrace_graph_entry_stub, ftrace_graph_entry
|
|
jnz ftrace_graph_caller
|
|
#endif
|
|
|
|
GLOBAL(ftrace_stub)
|
|
retq
|
|
|
|
trace:
|
|
MCOUNT_SAVE_FRAME
|
|
|
|
movq RIP(%rsp), %rdi
|
|
#ifdef CC_USING_FENTRY
|
|
movq SS+16(%rsp), %rsi
|
|
#else
|
|
movq 8(%rbp), %rsi
|
|
#endif
|
|
subq $MCOUNT_INSN_SIZE, %rdi
|
|
|
|
call *ftrace_trace_function
|
|
|
|
MCOUNT_RESTORE_FRAME
|
|
|
|
jmp ftrace_stub
|
|
END(function_hook)
|
|
#endif /* CONFIG_DYNAMIC_FTRACE */
|
|
#endif /* CONFIG_FUNCTION_TRACER */
|
|
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
ENTRY(ftrace_graph_caller)
|
|
MCOUNT_SAVE_FRAME
|
|
|
|
#ifdef CC_USING_FENTRY
|
|
leaq SS+16(%rsp), %rdi
|
|
movq $0, %rdx /* No framepointers needed */
|
|
#else
|
|
leaq 8(%rbp), %rdi
|
|
movq (%rbp), %rdx
|
|
#endif
|
|
movq RIP(%rsp), %rsi
|
|
subq $MCOUNT_INSN_SIZE, %rsi
|
|
|
|
call prepare_ftrace_return
|
|
|
|
MCOUNT_RESTORE_FRAME
|
|
|
|
retq
|
|
END(ftrace_graph_caller)
|
|
|
|
GLOBAL(return_to_handler)
|
|
subq $24, %rsp
|
|
|
|
/* Save the return values */
|
|
movq %rax, (%rsp)
|
|
movq %rdx, 8(%rsp)
|
|
movq %rbp, %rdi
|
|
|
|
call ftrace_return_to_handler
|
|
|
|
movq %rax, %rdi
|
|
movq 8(%rsp), %rdx
|
|
movq (%rsp), %rax
|
|
addq $24, %rsp
|
|
jmp *%rdi
|
|
#endif
|