f31b8de988
This export is not only not needed, but also breaks symbol versioning due to being an undeclared assembly export. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
130 lines
2.6 KiB
ArmAsm
130 lines
2.6 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/* Copyright (C) 2017 Andes Technology Corporation */
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/linkage.h>
|
|
#include <asm/asm.h>
|
|
#include <asm/csr.h>
|
|
#include <asm/unistd.h>
|
|
#include <asm/thread_info.h>
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm-generic/export.h>
|
|
#include <asm/ftrace.h>
|
|
|
|
.text
|
|
|
|
.macro SAVE_ABI_STATE
|
|
addi sp, sp, -16
|
|
sd s0, 0(sp)
|
|
sd ra, 8(sp)
|
|
addi s0, sp, 16
|
|
.endm
|
|
|
|
/*
|
|
* The call to ftrace_return_to_handler would overwrite the return
|
|
* register if a0 was not saved.
|
|
*/
|
|
.macro SAVE_RET_ABI_STATE
|
|
addi sp, sp, -32
|
|
sd s0, 16(sp)
|
|
sd ra, 24(sp)
|
|
sd a0, 8(sp)
|
|
addi s0, sp, 32
|
|
.endm
|
|
|
|
.macro RESTORE_ABI_STATE
|
|
ld ra, 8(sp)
|
|
ld s0, 0(sp)
|
|
addi sp, sp, 16
|
|
.endm
|
|
|
|
.macro RESTORE_RET_ABI_STATE
|
|
ld ra, 24(sp)
|
|
ld s0, 16(sp)
|
|
ld a0, 8(sp)
|
|
addi sp, sp, 32
|
|
.endm
|
|
|
|
ENTRY(ftrace_stub)
|
|
#ifdef CONFIG_DYNAMIC_FTRACE
|
|
.global _mcount
|
|
.set _mcount, ftrace_stub
|
|
#endif
|
|
ret
|
|
ENDPROC(ftrace_stub)
|
|
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
ENTRY(return_to_handler)
|
|
/*
|
|
* On implementing the frame point test, the ideal way is to compare the
|
|
* s0 (frame pointer, if enabled) on entry and the sp (stack pointer) on return.
|
|
* However, the psABI of variable-length-argument functions does not allow this.
|
|
*
|
|
* So alternatively we check the *old* frame pointer position, that is, the
|
|
* value stored in -16(s0) on entry, and the s0 on return.
|
|
*/
|
|
#ifdef HAVE_FUNCTION_GRAPH_FP_TEST
|
|
mv t6, s0
|
|
#endif
|
|
SAVE_RET_ABI_STATE
|
|
#ifdef HAVE_FUNCTION_GRAPH_FP_TEST
|
|
mv a0, t6
|
|
#endif
|
|
call ftrace_return_to_handler
|
|
mv a1, a0
|
|
RESTORE_RET_ABI_STATE
|
|
jalr a1
|
|
ENDPROC(return_to_handler)
|
|
#endif
|
|
|
|
#ifndef CONFIG_DYNAMIC_FTRACE
|
|
ENTRY(_mcount)
|
|
la t4, ftrace_stub
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
la t0, ftrace_graph_return
|
|
ld t1, 0(t0)
|
|
bne t1, t4, do_ftrace_graph_caller
|
|
|
|
la t3, ftrace_graph_entry
|
|
ld t2, 0(t3)
|
|
la t6, ftrace_graph_entry_stub
|
|
bne t2, t6, do_ftrace_graph_caller
|
|
#endif
|
|
la t3, ftrace_trace_function
|
|
ld t5, 0(t3)
|
|
bne t5, t4, do_trace
|
|
ret
|
|
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
/*
|
|
* A pseudo representation for the function graph tracer:
|
|
* prepare_to_return(&ra_to_caller_of_caller, ra_to_caller)
|
|
*/
|
|
do_ftrace_graph_caller:
|
|
addi a0, s0, -8
|
|
mv a1, ra
|
|
#ifdef HAVE_FUNCTION_GRAPH_FP_TEST
|
|
ld a2, -16(s0)
|
|
#endif
|
|
SAVE_ABI_STATE
|
|
call prepare_ftrace_return
|
|
RESTORE_ABI_STATE
|
|
ret
|
|
#endif
|
|
|
|
/*
|
|
* A pseudo representation for the function tracer:
|
|
* (*ftrace_trace_function)(ra_to_caller, ra_to_caller_of_caller)
|
|
*/
|
|
do_trace:
|
|
ld a1, -8(s0)
|
|
mv a0, ra
|
|
|
|
SAVE_ABI_STATE
|
|
jalr t5
|
|
RESTORE_ABI_STATE
|
|
ret
|
|
ENDPROC(_mcount)
|
|
#endif
|
|
EXPORT_SYMBOL(_mcount)
|