mirror of https://gitee.com/openkylin/linux.git
71 lines
1.4 KiB
ArmAsm
71 lines
1.4 KiB
ArmAsm
/*
|
|
* Split from ftrace_64.S
|
|
*
|
|
* 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; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#include <linux/magic.h>
|
|
#include <asm/ppc_asm.h>
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm/ftrace.h>
|
|
#include <asm/ppc-opcode.h>
|
|
#include <asm/export.h>
|
|
|
|
_GLOBAL_TOC(ftrace_caller)
|
|
lbz r3, PACA_FTRACE_ENABLED(r13)
|
|
cmpdi r3, 0
|
|
beqlr
|
|
|
|
/* Taken from output of objdump from lib64/glibc */
|
|
mflr r3
|
|
ld r11, 0(r1)
|
|
stdu r1, -112(r1)
|
|
std r3, 128(r1)
|
|
ld r4, 16(r11)
|
|
subi r3, r3, MCOUNT_INSN_SIZE
|
|
.globl ftrace_call
|
|
ftrace_call:
|
|
bl ftrace_stub
|
|
nop
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
.globl ftrace_graph_call
|
|
ftrace_graph_call:
|
|
b ftrace_graph_stub
|
|
_GLOBAL(ftrace_graph_stub)
|
|
#endif
|
|
ld r0, 128(r1)
|
|
mtlr r0
|
|
addi r1, r1, 112
|
|
|
|
_GLOBAL(ftrace_stub)
|
|
blr
|
|
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
_GLOBAL(ftrace_graph_caller)
|
|
/* load r4 with local address */
|
|
ld r4, 128(r1)
|
|
subi r4, r4, MCOUNT_INSN_SIZE
|
|
|
|
/* Grab the LR out of the caller stack frame */
|
|
ld r11, 112(r1)
|
|
ld r3, 16(r11)
|
|
|
|
bl prepare_ftrace_return
|
|
nop
|
|
|
|
/*
|
|
* prepare_ftrace_return gives us the address we divert to.
|
|
* Change the LR in the callers stack frame to this.
|
|
*/
|
|
ld r11, 112(r1)
|
|
std r3, 16(r11)
|
|
|
|
ld r0, 128(r1)
|
|
mtlr r0
|
|
addi r1, r1, 112
|
|
blr
|
|
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
|