mirror of https://gitee.com/openkylin/linux.git
ARM: move ftrace assembly code to separate file
The ftrace assembly code doesn't need to live in entry-common.S and be surrounded with #ifdef CONFIG_FUNCTION_TRACER. Instead, move it to its own file and conditionally assemble it. Tested-by: Felipe Balbi <balbi@ti.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
parent
719c9d1489
commit
82112379b7
|
@ -47,6 +47,7 @@ endif
|
||||||
obj-$(CONFIG_HAVE_ARM_SCU) += smp_scu.o
|
obj-$(CONFIG_HAVE_ARM_SCU) += smp_scu.o
|
||||||
obj-$(CONFIG_HAVE_ARM_TWD) += smp_twd.o
|
obj-$(CONFIG_HAVE_ARM_TWD) += smp_twd.o
|
||||||
obj-$(CONFIG_ARM_ARCH_TIMER) += arch_timer.o
|
obj-$(CONFIG_ARM_ARCH_TIMER) += arch_timer.o
|
||||||
|
obj-$(CONFIG_FUNCTION_TRACER) += entry-ftrace.o
|
||||||
obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o insn.o
|
obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o insn.o
|
||||||
obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += ftrace.o insn.o
|
obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += ftrace.o insn.o
|
||||||
obj-$(CONFIG_JUMP_LABEL) += jump_label.o insn.o patch.o
|
obj-$(CONFIG_JUMP_LABEL) += jump_label.o insn.o patch.o
|
||||||
|
|
|
@ -109,241 +109,6 @@ ENDPROC(ret_from_fork)
|
||||||
#undef CALL
|
#undef CALL
|
||||||
#define CALL(x) .long x
|
#define CALL(x) .long x
|
||||||
|
|
||||||
#ifdef CONFIG_FUNCTION_TRACER
|
|
||||||
/*
|
|
||||||
* When compiling with -pg, gcc inserts a call to the mcount routine at the
|
|
||||||
* start of every function. In mcount, apart from the function's address (in
|
|
||||||
* lr), we need to get hold of the function's caller's address.
|
|
||||||
*
|
|
||||||
* Older GCCs (pre-4.4) inserted a call to a routine called mcount like this:
|
|
||||||
*
|
|
||||||
* bl mcount
|
|
||||||
*
|
|
||||||
* These versions have the limitation that in order for the mcount routine to
|
|
||||||
* be able to determine the function's caller's address, an APCS-style frame
|
|
||||||
* pointer (which is set up with something like the code below) is required.
|
|
||||||
*
|
|
||||||
* mov ip, sp
|
|
||||||
* push {fp, ip, lr, pc}
|
|
||||||
* sub fp, ip, #4
|
|
||||||
*
|
|
||||||
* With EABI, these frame pointers are not available unless -mapcs-frame is
|
|
||||||
* specified, and if building as Thumb-2, not even then.
|
|
||||||
*
|
|
||||||
* Newer GCCs (4.4+) solve this problem by introducing a new version of mcount,
|
|
||||||
* with call sites like:
|
|
||||||
*
|
|
||||||
* push {lr}
|
|
||||||
* bl __gnu_mcount_nc
|
|
||||||
*
|
|
||||||
* With these compilers, frame pointers are not necessary.
|
|
||||||
*
|
|
||||||
* mcount can be thought of as a function called in the middle of a subroutine
|
|
||||||
* call. As such, it needs to be transparent for both the caller and the
|
|
||||||
* callee: the original lr needs to be restored when leaving mcount, and no
|
|
||||||
* registers should be clobbered. (In the __gnu_mcount_nc implementation, we
|
|
||||||
* clobber the ip register. This is OK because the ARM calling convention
|
|
||||||
* allows it to be clobbered in subroutines and doesn't use it to hold
|
|
||||||
* parameters.)
|
|
||||||
*
|
|
||||||
* When using dynamic ftrace, we patch out the mcount call by a "mov r0, r0"
|
|
||||||
* for the mcount case, and a "pop {lr}" for the __gnu_mcount_nc case (see
|
|
||||||
* arch/arm/kernel/ftrace.c).
|
|
||||||
*/
|
|
||||||
|
|
||||||
#ifndef CONFIG_OLD_MCOUNT
|
|
||||||
#if (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 4))
|
|
||||||
#error Ftrace requires CONFIG_FRAME_POINTER=y with GCC older than 4.4.0.
|
|
||||||
#endif
|
|
||||||
#endif
|
|
||||||
|
|
||||||
.macro mcount_adjust_addr rd, rn
|
|
||||||
bic \rd, \rn, #1 @ clear the Thumb bit if present
|
|
||||||
sub \rd, \rd, #MCOUNT_INSN_SIZE
|
|
||||||
.endm
|
|
||||||
|
|
||||||
.macro __mcount suffix
|
|
||||||
mcount_enter
|
|
||||||
ldr r0, =ftrace_trace_function
|
|
||||||
ldr r2, [r0]
|
|
||||||
adr r0, .Lftrace_stub
|
|
||||||
cmp r0, r2
|
|
||||||
bne 1f
|
|
||||||
|
|
||||||
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
||||||
ldr r1, =ftrace_graph_return
|
|
||||||
ldr r2, [r1]
|
|
||||||
cmp r0, r2
|
|
||||||
bne ftrace_graph_caller\suffix
|
|
||||||
|
|
||||||
ldr r1, =ftrace_graph_entry
|
|
||||||
ldr r2, [r1]
|
|
||||||
ldr r0, =ftrace_graph_entry_stub
|
|
||||||
cmp r0, r2
|
|
||||||
bne ftrace_graph_caller\suffix
|
|
||||||
#endif
|
|
||||||
|
|
||||||
mcount_exit
|
|
||||||
|
|
||||||
1: mcount_get_lr r1 @ lr of instrumented func
|
|
||||||
mcount_adjust_addr r0, lr @ instrumented function
|
|
||||||
adr lr, BSYM(2f)
|
|
||||||
mov pc, r2
|
|
||||||
2: mcount_exit
|
|
||||||
.endm
|
|
||||||
|
|
||||||
.macro __ftrace_caller suffix
|
|
||||||
mcount_enter
|
|
||||||
|
|
||||||
mcount_get_lr r1 @ lr of instrumented func
|
|
||||||
mcount_adjust_addr r0, lr @ instrumented function
|
|
||||||
|
|
||||||
.globl ftrace_call\suffix
|
|
||||||
ftrace_call\suffix:
|
|
||||||
bl ftrace_stub
|
|
||||||
|
|
||||||
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
||||||
.globl ftrace_graph_call\suffix
|
|
||||||
ftrace_graph_call\suffix:
|
|
||||||
mov r0, r0
|
|
||||||
#endif
|
|
||||||
|
|
||||||
mcount_exit
|
|
||||||
.endm
|
|
||||||
|
|
||||||
.macro __ftrace_graph_caller
|
|
||||||
sub r0, fp, #4 @ &lr of instrumented routine (&parent)
|
|
||||||
#ifdef CONFIG_DYNAMIC_FTRACE
|
|
||||||
@ called from __ftrace_caller, saved in mcount_enter
|
|
||||||
ldr r1, [sp, #16] @ instrumented routine (func)
|
|
||||||
mcount_adjust_addr r1, r1
|
|
||||||
#else
|
|
||||||
@ called from __mcount, untouched in lr
|
|
||||||
mcount_adjust_addr r1, lr @ instrumented routine (func)
|
|
||||||
#endif
|
|
||||||
mov r2, fp @ frame pointer
|
|
||||||
bl prepare_ftrace_return
|
|
||||||
mcount_exit
|
|
||||||
.endm
|
|
||||||
|
|
||||||
#ifdef CONFIG_OLD_MCOUNT
|
|
||||||
/*
|
|
||||||
* mcount
|
|
||||||
*/
|
|
||||||
|
|
||||||
.macro mcount_enter
|
|
||||||
stmdb sp!, {r0-r3, lr}
|
|
||||||
.endm
|
|
||||||
|
|
||||||
.macro mcount_get_lr reg
|
|
||||||
ldr \reg, [fp, #-4]
|
|
||||||
.endm
|
|
||||||
|
|
||||||
.macro mcount_exit
|
|
||||||
ldr lr, [fp, #-4]
|
|
||||||
ldmia sp!, {r0-r3, pc}
|
|
||||||
.endm
|
|
||||||
|
|
||||||
ENTRY(mcount)
|
|
||||||
#ifdef CONFIG_DYNAMIC_FTRACE
|
|
||||||
stmdb sp!, {lr}
|
|
||||||
ldr lr, [fp, #-4]
|
|
||||||
ldmia sp!, {pc}
|
|
||||||
#else
|
|
||||||
__mcount _old
|
|
||||||
#endif
|
|
||||||
ENDPROC(mcount)
|
|
||||||
|
|
||||||
#ifdef CONFIG_DYNAMIC_FTRACE
|
|
||||||
ENTRY(ftrace_caller_old)
|
|
||||||
__ftrace_caller _old
|
|
||||||
ENDPROC(ftrace_caller_old)
|
|
||||||
#endif
|
|
||||||
|
|
||||||
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
||||||
ENTRY(ftrace_graph_caller_old)
|
|
||||||
__ftrace_graph_caller
|
|
||||||
ENDPROC(ftrace_graph_caller_old)
|
|
||||||
#endif
|
|
||||||
|
|
||||||
.purgem mcount_enter
|
|
||||||
.purgem mcount_get_lr
|
|
||||||
.purgem mcount_exit
|
|
||||||
#endif
|
|
||||||
|
|
||||||
/*
|
|
||||||
* __gnu_mcount_nc
|
|
||||||
*/
|
|
||||||
|
|
||||||
.macro mcount_enter
|
|
||||||
/*
|
|
||||||
* This pad compensates for the push {lr} at the call site. Note that we are
|
|
||||||
* unable to unwind through a function which does not otherwise save its lr.
|
|
||||||
*/
|
|
||||||
UNWIND(.pad #4)
|
|
||||||
stmdb sp!, {r0-r3, lr}
|
|
||||||
UNWIND(.save {r0-r3, lr})
|
|
||||||
.endm
|
|
||||||
|
|
||||||
.macro mcount_get_lr reg
|
|
||||||
ldr \reg, [sp, #20]
|
|
||||||
.endm
|
|
||||||
|
|
||||||
.macro mcount_exit
|
|
||||||
ldmia sp!, {r0-r3, ip, lr}
|
|
||||||
ret ip
|
|
||||||
.endm
|
|
||||||
|
|
||||||
ENTRY(__gnu_mcount_nc)
|
|
||||||
UNWIND(.fnstart)
|
|
||||||
#ifdef CONFIG_DYNAMIC_FTRACE
|
|
||||||
mov ip, lr
|
|
||||||
ldmia sp!, {lr}
|
|
||||||
ret ip
|
|
||||||
#else
|
|
||||||
__mcount
|
|
||||||
#endif
|
|
||||||
UNWIND(.fnend)
|
|
||||||
ENDPROC(__gnu_mcount_nc)
|
|
||||||
|
|
||||||
#ifdef CONFIG_DYNAMIC_FTRACE
|
|
||||||
ENTRY(ftrace_caller)
|
|
||||||
UNWIND(.fnstart)
|
|
||||||
__ftrace_caller
|
|
||||||
UNWIND(.fnend)
|
|
||||||
ENDPROC(ftrace_caller)
|
|
||||||
#endif
|
|
||||||
|
|
||||||
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
||||||
ENTRY(ftrace_graph_caller)
|
|
||||||
UNWIND(.fnstart)
|
|
||||||
__ftrace_graph_caller
|
|
||||||
UNWIND(.fnend)
|
|
||||||
ENDPROC(ftrace_graph_caller)
|
|
||||||
#endif
|
|
||||||
|
|
||||||
.purgem mcount_enter
|
|
||||||
.purgem mcount_get_lr
|
|
||||||
.purgem mcount_exit
|
|
||||||
|
|
||||||
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
||||||
.globl return_to_handler
|
|
||||||
return_to_handler:
|
|
||||||
stmdb sp!, {r0-r3}
|
|
||||||
mov r0, fp @ frame pointer
|
|
||||||
bl ftrace_return_to_handler
|
|
||||||
mov lr, r0 @ r0 has real ret addr
|
|
||||||
ldmia sp!, {r0-r3}
|
|
||||||
ret lr
|
|
||||||
#endif
|
|
||||||
|
|
||||||
ENTRY(ftrace_stub)
|
|
||||||
.Lftrace_stub:
|
|
||||||
ret lr
|
|
||||||
ENDPROC(ftrace_stub)
|
|
||||||
|
|
||||||
#endif /* CONFIG_FUNCTION_TRACER */
|
|
||||||
|
|
||||||
/*=============================================================================
|
/*=============================================================================
|
||||||
* SWI handler
|
* SWI handler
|
||||||
*-----------------------------------------------------------------------------
|
*-----------------------------------------------------------------------------
|
||||||
|
|
|
@ -0,0 +1,243 @@
|
||||||
|
/*
|
||||||
|
* This program is free software; you can redistribute it and/or modify
|
||||||
|
* it under the terms of the GNU General Public License version 2 as
|
||||||
|
* published by the Free Software Foundation.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include <asm/assembler.h>
|
||||||
|
#include <asm/ftrace.h>
|
||||||
|
#include <asm/unwind.h>
|
||||||
|
|
||||||
|
#include "entry-header.S"
|
||||||
|
|
||||||
|
/*
|
||||||
|
* When compiling with -pg, gcc inserts a call to the mcount routine at the
|
||||||
|
* start of every function. In mcount, apart from the function's address (in
|
||||||
|
* lr), we need to get hold of the function's caller's address.
|
||||||
|
*
|
||||||
|
* Older GCCs (pre-4.4) inserted a call to a routine called mcount like this:
|
||||||
|
*
|
||||||
|
* bl mcount
|
||||||
|
*
|
||||||
|
* These versions have the limitation that in order for the mcount routine to
|
||||||
|
* be able to determine the function's caller's address, an APCS-style frame
|
||||||
|
* pointer (which is set up with something like the code below) is required.
|
||||||
|
*
|
||||||
|
* mov ip, sp
|
||||||
|
* push {fp, ip, lr, pc}
|
||||||
|
* sub fp, ip, #4
|
||||||
|
*
|
||||||
|
* With EABI, these frame pointers are not available unless -mapcs-frame is
|
||||||
|
* specified, and if building as Thumb-2, not even then.
|
||||||
|
*
|
||||||
|
* Newer GCCs (4.4+) solve this problem by introducing a new version of mcount,
|
||||||
|
* with call sites like:
|
||||||
|
*
|
||||||
|
* push {lr}
|
||||||
|
* bl __gnu_mcount_nc
|
||||||
|
*
|
||||||
|
* With these compilers, frame pointers are not necessary.
|
||||||
|
*
|
||||||
|
* mcount can be thought of as a function called in the middle of a subroutine
|
||||||
|
* call. As such, it needs to be transparent for both the caller and the
|
||||||
|
* callee: the original lr needs to be restored when leaving mcount, and no
|
||||||
|
* registers should be clobbered. (In the __gnu_mcount_nc implementation, we
|
||||||
|
* clobber the ip register. This is OK because the ARM calling convention
|
||||||
|
* allows it to be clobbered in subroutines and doesn't use it to hold
|
||||||
|
* parameters.)
|
||||||
|
*
|
||||||
|
* When using dynamic ftrace, we patch out the mcount call by a "mov r0, r0"
|
||||||
|
* for the mcount case, and a "pop {lr}" for the __gnu_mcount_nc case (see
|
||||||
|
* arch/arm/kernel/ftrace.c).
|
||||||
|
*/
|
||||||
|
|
||||||
|
#ifndef CONFIG_OLD_MCOUNT
|
||||||
|
#if (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 4))
|
||||||
|
#error Ftrace requires CONFIG_FRAME_POINTER=y with GCC older than 4.4.0.
|
||||||
|
#endif
|
||||||
|
#endif
|
||||||
|
|
||||||
|
.macro mcount_adjust_addr rd, rn
|
||||||
|
bic \rd, \rn, #1 @ clear the Thumb bit if present
|
||||||
|
sub \rd, \rd, #MCOUNT_INSN_SIZE
|
||||||
|
.endm
|
||||||
|
|
||||||
|
.macro __mcount suffix
|
||||||
|
mcount_enter
|
||||||
|
ldr r0, =ftrace_trace_function
|
||||||
|
ldr r2, [r0]
|
||||||
|
adr r0, .Lftrace_stub
|
||||||
|
cmp r0, r2
|
||||||
|
bne 1f
|
||||||
|
|
||||||
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
||||||
|
ldr r1, =ftrace_graph_return
|
||||||
|
ldr r2, [r1]
|
||||||
|
cmp r0, r2
|
||||||
|
bne ftrace_graph_caller\suffix
|
||||||
|
|
||||||
|
ldr r1, =ftrace_graph_entry
|
||||||
|
ldr r2, [r1]
|
||||||
|
ldr r0, =ftrace_graph_entry_stub
|
||||||
|
cmp r0, r2
|
||||||
|
bne ftrace_graph_caller\suffix
|
||||||
|
#endif
|
||||||
|
|
||||||
|
mcount_exit
|
||||||
|
|
||||||
|
1: mcount_get_lr r1 @ lr of instrumented func
|
||||||
|
mcount_adjust_addr r0, lr @ instrumented function
|
||||||
|
adr lr, BSYM(2f)
|
||||||
|
mov pc, r2
|
||||||
|
2: mcount_exit
|
||||||
|
.endm
|
||||||
|
|
||||||
|
.macro __ftrace_caller suffix
|
||||||
|
mcount_enter
|
||||||
|
|
||||||
|
mcount_get_lr r1 @ lr of instrumented func
|
||||||
|
mcount_adjust_addr r0, lr @ instrumented function
|
||||||
|
|
||||||
|
.globl ftrace_call\suffix
|
||||||
|
ftrace_call\suffix:
|
||||||
|
bl ftrace_stub
|
||||||
|
|
||||||
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
||||||
|
.globl ftrace_graph_call\suffix
|
||||||
|
ftrace_graph_call\suffix:
|
||||||
|
mov r0, r0
|
||||||
|
#endif
|
||||||
|
|
||||||
|
mcount_exit
|
||||||
|
.endm
|
||||||
|
|
||||||
|
.macro __ftrace_graph_caller
|
||||||
|
sub r0, fp, #4 @ &lr of instrumented routine (&parent)
|
||||||
|
#ifdef CONFIG_DYNAMIC_FTRACE
|
||||||
|
@ called from __ftrace_caller, saved in mcount_enter
|
||||||
|
ldr r1, [sp, #16] @ instrumented routine (func)
|
||||||
|
mcount_adjust_addr r1, r1
|
||||||
|
#else
|
||||||
|
@ called from __mcount, untouched in lr
|
||||||
|
mcount_adjust_addr r1, lr @ instrumented routine (func)
|
||||||
|
#endif
|
||||||
|
mov r2, fp @ frame pointer
|
||||||
|
bl prepare_ftrace_return
|
||||||
|
mcount_exit
|
||||||
|
.endm
|
||||||
|
|
||||||
|
#ifdef CONFIG_OLD_MCOUNT
|
||||||
|
/*
|
||||||
|
* mcount
|
||||||
|
*/
|
||||||
|
|
||||||
|
.macro mcount_enter
|
||||||
|
stmdb sp!, {r0-r3, lr}
|
||||||
|
.endm
|
||||||
|
|
||||||
|
.macro mcount_get_lr reg
|
||||||
|
ldr \reg, [fp, #-4]
|
||||||
|
.endm
|
||||||
|
|
||||||
|
.macro mcount_exit
|
||||||
|
ldr lr, [fp, #-4]
|
||||||
|
ldmia sp!, {r0-r3, pc}
|
||||||
|
.endm
|
||||||
|
|
||||||
|
ENTRY(mcount)
|
||||||
|
#ifdef CONFIG_DYNAMIC_FTRACE
|
||||||
|
stmdb sp!, {lr}
|
||||||
|
ldr lr, [fp, #-4]
|
||||||
|
ldmia sp!, {pc}
|
||||||
|
#else
|
||||||
|
__mcount _old
|
||||||
|
#endif
|
||||||
|
ENDPROC(mcount)
|
||||||
|
|
||||||
|
#ifdef CONFIG_DYNAMIC_FTRACE
|
||||||
|
ENTRY(ftrace_caller_old)
|
||||||
|
__ftrace_caller _old
|
||||||
|
ENDPROC(ftrace_caller_old)
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
||||||
|
ENTRY(ftrace_graph_caller_old)
|
||||||
|
__ftrace_graph_caller
|
||||||
|
ENDPROC(ftrace_graph_caller_old)
|
||||||
|
#endif
|
||||||
|
|
||||||
|
.purgem mcount_enter
|
||||||
|
.purgem mcount_get_lr
|
||||||
|
.purgem mcount_exit
|
||||||
|
#endif
|
||||||
|
|
||||||
|
/*
|
||||||
|
* __gnu_mcount_nc
|
||||||
|
*/
|
||||||
|
|
||||||
|
.macro mcount_enter
|
||||||
|
/*
|
||||||
|
* This pad compensates for the push {lr} at the call site. Note that we are
|
||||||
|
* unable to unwind through a function which does not otherwise save its lr.
|
||||||
|
*/
|
||||||
|
UNWIND(.pad #4)
|
||||||
|
stmdb sp!, {r0-r3, lr}
|
||||||
|
UNWIND(.save {r0-r3, lr})
|
||||||
|
.endm
|
||||||
|
|
||||||
|
.macro mcount_get_lr reg
|
||||||
|
ldr \reg, [sp, #20]
|
||||||
|
.endm
|
||||||
|
|
||||||
|
.macro mcount_exit
|
||||||
|
ldmia sp!, {r0-r3, ip, lr}
|
||||||
|
ret ip
|
||||||
|
.endm
|
||||||
|
|
||||||
|
ENTRY(__gnu_mcount_nc)
|
||||||
|
UNWIND(.fnstart)
|
||||||
|
#ifdef CONFIG_DYNAMIC_FTRACE
|
||||||
|
mov ip, lr
|
||||||
|
ldmia sp!, {lr}
|
||||||
|
ret ip
|
||||||
|
#else
|
||||||
|
__mcount
|
||||||
|
#endif
|
||||||
|
UNWIND(.fnend)
|
||||||
|
ENDPROC(__gnu_mcount_nc)
|
||||||
|
|
||||||
|
#ifdef CONFIG_DYNAMIC_FTRACE
|
||||||
|
ENTRY(ftrace_caller)
|
||||||
|
UNWIND(.fnstart)
|
||||||
|
__ftrace_caller
|
||||||
|
UNWIND(.fnend)
|
||||||
|
ENDPROC(ftrace_caller)
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
||||||
|
ENTRY(ftrace_graph_caller)
|
||||||
|
UNWIND(.fnstart)
|
||||||
|
__ftrace_graph_caller
|
||||||
|
UNWIND(.fnend)
|
||||||
|
ENDPROC(ftrace_graph_caller)
|
||||||
|
#endif
|
||||||
|
|
||||||
|
.purgem mcount_enter
|
||||||
|
.purgem mcount_get_lr
|
||||||
|
.purgem mcount_exit
|
||||||
|
|
||||||
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
||||||
|
.globl return_to_handler
|
||||||
|
return_to_handler:
|
||||||
|
stmdb sp!, {r0-r3}
|
||||||
|
mov r0, fp @ frame pointer
|
||||||
|
bl ftrace_return_to_handler
|
||||||
|
mov lr, r0 @ r0 has real ret addr
|
||||||
|
ldmia sp!, {r0-r3}
|
||||||
|
ret lr
|
||||||
|
#endif
|
||||||
|
|
||||||
|
ENTRY(ftrace_stub)
|
||||||
|
.Lftrace_stub:
|
||||||
|
ret lr
|
||||||
|
ENDPROC(ftrace_stub)
|
Loading…
Reference in New Issue