mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-18 09:44:18 +08:00
437d3e124d
- Add support for ARCH_SUPPORTS_FTRACE_OPS
- Replace the instruction in ftrace_call with the bundle {move r10, lr;
jal ftrace_stub}, so that the lr contains the right value after returning
from ftrace_stub. An alternative fix might be to leave the instruction
in ftrace_call alone when it is being updated with ftrace_stub.
Signed-off-by: Tony Lu <zlu@ezchip.com>
Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>
212 lines
4.7 KiB
ArmAsm
212 lines
4.7 KiB
ArmAsm
/*
|
|
* Copyright 2012 Tilera Corporation. All Rights Reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation, version 2.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
|
|
* NON INFRINGEMENT. See the GNU General Public License for
|
|
* more details.
|
|
*
|
|
* TILE-Gx specific __mcount support
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <asm/ftrace.h>
|
|
|
|
#define REGSIZE 8
|
|
|
|
.text
|
|
.global __mcount
|
|
|
|
.macro MCOUNT_SAVE_REGS
|
|
addli sp, sp, -REGSIZE
|
|
{
|
|
st sp, lr
|
|
addli r29, sp, - (12 * REGSIZE)
|
|
}
|
|
{
|
|
addli sp, sp, - (13 * REGSIZE)
|
|
st r29, sp
|
|
}
|
|
addli r29, r29, REGSIZE
|
|
{ st r29, r0; addli r29, r29, REGSIZE }
|
|
{ st r29, r1; addli r29, r29, REGSIZE }
|
|
{ st r29, r2; addli r29, r29, REGSIZE }
|
|
{ st r29, r3; addli r29, r29, REGSIZE }
|
|
{ st r29, r4; addli r29, r29, REGSIZE }
|
|
{ st r29, r5; addli r29, r29, REGSIZE }
|
|
{ st r29, r6; addli r29, r29, REGSIZE }
|
|
{ st r29, r7; addli r29, r29, REGSIZE }
|
|
{ st r29, r8; addli r29, r29, REGSIZE }
|
|
{ st r29, r9; addli r29, r29, REGSIZE }
|
|
{ st r29, r10; addli r29, r29, REGSIZE }
|
|
.endm
|
|
|
|
.macro MCOUNT_RESTORE_REGS
|
|
addli r29, sp, (2 * REGSIZE)
|
|
{ ld r0, r29; addli r29, r29, REGSIZE }
|
|
{ ld r1, r29; addli r29, r29, REGSIZE }
|
|
{ ld r2, r29; addli r29, r29, REGSIZE }
|
|
{ ld r3, r29; addli r29, r29, REGSIZE }
|
|
{ ld r4, r29; addli r29, r29, REGSIZE }
|
|
{ ld r5, r29; addli r29, r29, REGSIZE }
|
|
{ ld r6, r29; addli r29, r29, REGSIZE }
|
|
{ ld r7, r29; addli r29, r29, REGSIZE }
|
|
{ ld r8, r29; addli r29, r29, REGSIZE }
|
|
{ ld r9, r29; addli r29, r29, REGSIZE }
|
|
{ ld r10, r29; addli lr, sp, (13 * REGSIZE) }
|
|
{ ld lr, lr; addli sp, sp, (14 * REGSIZE) }
|
|
.endm
|
|
|
|
.macro RETURN_BACK
|
|
{ move r12, lr; move lr, r10 }
|
|
jrp r12
|
|
.endm
|
|
|
|
#ifdef CONFIG_DYNAMIC_FTRACE
|
|
|
|
.align 64
|
|
STD_ENTRY(__mcount)
|
|
__mcount:
|
|
j ftrace_stub
|
|
STD_ENDPROC(__mcount)
|
|
|
|
.align 64
|
|
STD_ENTRY(ftrace_caller)
|
|
MCOUNT_SAVE_REGS
|
|
|
|
/* arg1: self return address */
|
|
/* arg2: parent's return address */
|
|
/* arg3: ftrace_ops */
|
|
/* arg4: regs (but make it NULL) */
|
|
{ move r0, lr; moveli r2, hw2_last(function_trace_op) }
|
|
{ move r1, r10; shl16insli r2, r2, hw1(function_trace_op) }
|
|
{ movei r3, 0; shl16insli r2, r2, hw0(function_trace_op) }
|
|
ld r2,r2
|
|
|
|
.global ftrace_call
|
|
ftrace_call:
|
|
/*
|
|
* a placeholder for the call to a real tracing function, i.e.
|
|
* ftrace_trace_function()
|
|
*/
|
|
nop
|
|
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
.global ftrace_graph_call
|
|
ftrace_graph_call:
|
|
/*
|
|
* a placeholder for the call to a real tracing function, i.e.
|
|
* ftrace_graph_caller()
|
|
*/
|
|
nop
|
|
#endif
|
|
MCOUNT_RESTORE_REGS
|
|
.global ftrace_stub
|
|
ftrace_stub:
|
|
RETURN_BACK
|
|
STD_ENDPROC(ftrace_caller)
|
|
|
|
#else /* ! CONFIG_DYNAMIC_FTRACE */
|
|
|
|
.align 64
|
|
STD_ENTRY(__mcount)
|
|
{
|
|
moveli r11, hw2_last(ftrace_trace_function)
|
|
moveli r13, hw2_last(ftrace_stub)
|
|
}
|
|
{
|
|
shl16insli r11, r11, hw1(ftrace_trace_function)
|
|
shl16insli r13, r13, hw1(ftrace_stub)
|
|
}
|
|
{
|
|
shl16insli r11, r11, hw0(ftrace_trace_function)
|
|
shl16insli r13, r13, hw0(ftrace_stub)
|
|
}
|
|
|
|
ld r11, r11
|
|
sub r14, r13, r11
|
|
bnez r14, static_trace
|
|
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
moveli r15, hw2_last(ftrace_graph_return)
|
|
shl16insli r15, r15, hw1(ftrace_graph_return)
|
|
shl16insli r15, r15, hw0(ftrace_graph_return)
|
|
ld r15, r15
|
|
sub r15, r15, r13
|
|
bnez r15, ftrace_graph_caller
|
|
|
|
{
|
|
moveli r16, hw2_last(ftrace_graph_entry)
|
|
moveli r17, hw2_last(ftrace_graph_entry_stub)
|
|
}
|
|
{
|
|
shl16insli r16, r16, hw1(ftrace_graph_entry)
|
|
shl16insli r17, r17, hw1(ftrace_graph_entry_stub)
|
|
}
|
|
{
|
|
shl16insli r16, r16, hw0(ftrace_graph_entry)
|
|
shl16insli r17, r17, hw0(ftrace_graph_entry_stub)
|
|
}
|
|
ld r16, r16
|
|
sub r17, r16, r17
|
|
bnez r17, ftrace_graph_caller
|
|
|
|
#endif
|
|
RETURN_BACK
|
|
|
|
static_trace:
|
|
MCOUNT_SAVE_REGS
|
|
|
|
/* arg1: self return address */
|
|
/* arg2: parent's return address */
|
|
{ move r0, lr; move r1, r10 }
|
|
|
|
/* call ftrace_trace_function() */
|
|
jalr r11
|
|
|
|
MCOUNT_RESTORE_REGS
|
|
|
|
.global ftrace_stub
|
|
ftrace_stub:
|
|
RETURN_BACK
|
|
STD_ENDPROC(__mcount)
|
|
|
|
#endif /* ! CONFIG_DYNAMIC_FTRACE */
|
|
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
|
|
STD_ENTRY(ftrace_graph_caller)
|
|
ftrace_graph_caller:
|
|
#ifndef CONFIG_DYNAMIC_FTRACE
|
|
MCOUNT_SAVE_REGS
|
|
#endif
|
|
|
|
/* arg1: Get the location of the parent's return address */
|
|
addi r0, sp, 12 * REGSIZE
|
|
/* arg2: Get self return address */
|
|
move r1, lr
|
|
|
|
jal prepare_ftrace_return
|
|
|
|
MCOUNT_RESTORE_REGS
|
|
RETURN_BACK
|
|
STD_ENDPROC(ftrace_graph_caller)
|
|
|
|
.global return_to_handler
|
|
return_to_handler:
|
|
MCOUNT_SAVE_REGS
|
|
|
|
jal ftrace_return_to_handler
|
|
/* restore the real parent address */
|
|
move r11, r0
|
|
|
|
MCOUNT_RESTORE_REGS
|
|
jr r11
|
|
|
|
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
|