190 lines
3.8 KiB
ArmAsm
190 lines
3.8 KiB
ArmAsm
/*
|
|
* MIPS specific _mcount support
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive for
|
|
* more details.
|
|
*
|
|
* Copyright (C) 2009 Lemote Inc. & DSLab, Lanzhou University, China
|
|
* Author: Wu Zhangjin <wuzhangjin@gmail.com>
|
|
*/
|
|
|
|
#include <asm/regdef.h>
|
|
#include <asm/stackframe.h>
|
|
#include <asm/ftrace.h>
|
|
|
|
.text
|
|
.set noreorder
|
|
.set noat
|
|
|
|
.macro MCOUNT_SAVE_REGS
|
|
PTR_SUBU sp, PT_SIZE
|
|
PTR_S ra, PT_R31(sp)
|
|
PTR_S AT, PT_R1(sp)
|
|
PTR_S a0, PT_R4(sp)
|
|
PTR_S a1, PT_R5(sp)
|
|
PTR_S a2, PT_R6(sp)
|
|
PTR_S a3, PT_R7(sp)
|
|
#ifdef CONFIG_64BIT
|
|
PTR_S a4, PT_R8(sp)
|
|
PTR_S a5, PT_R9(sp)
|
|
PTR_S a6, PT_R10(sp)
|
|
PTR_S a7, PT_R11(sp)
|
|
#endif
|
|
.endm
|
|
|
|
.macro MCOUNT_RESTORE_REGS
|
|
PTR_L ra, PT_R31(sp)
|
|
PTR_L AT, PT_R1(sp)
|
|
PTR_L a0, PT_R4(sp)
|
|
PTR_L a1, PT_R5(sp)
|
|
PTR_L a2, PT_R6(sp)
|
|
PTR_L a3, PT_R7(sp)
|
|
#ifdef CONFIG_64BIT
|
|
PTR_L a4, PT_R8(sp)
|
|
PTR_L a5, PT_R9(sp)
|
|
PTR_L a6, PT_R10(sp)
|
|
PTR_L a7, PT_R11(sp)
|
|
#endif
|
|
#ifdef CONFIG_64BIT
|
|
PTR_ADDIU sp, PT_SIZE
|
|
#else
|
|
PTR_ADDIU sp, (PT_SIZE + 8)
|
|
#endif
|
|
.endm
|
|
|
|
.macro RETURN_BACK
|
|
jr ra
|
|
move ra, AT
|
|
.endm
|
|
|
|
#ifdef CONFIG_DYNAMIC_FTRACE
|
|
|
|
NESTED(ftrace_caller, PT_SIZE, ra)
|
|
.globl _mcount
|
|
_mcount:
|
|
b ftrace_stub
|
|
nop
|
|
lw t1, function_trace_stop
|
|
bnez t1, ftrace_stub
|
|
nop
|
|
|
|
MCOUNT_SAVE_REGS
|
|
#ifdef KBUILD_MCOUNT_RA_ADDRESS
|
|
PTR_S t0, PT_R12(sp) /* t0 saved the location of the return address(at) by -mmcount-ra-address */
|
|
#endif
|
|
|
|
move a0, ra /* arg1: next ip, selfaddr */
|
|
.globl ftrace_call
|
|
ftrace_call:
|
|
nop /* a placeholder for the call to a real tracing function */
|
|
move a1, AT /* arg2: the caller's next ip, parent */
|
|
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
.globl ftrace_graph_call
|
|
ftrace_graph_call:
|
|
nop
|
|
nop
|
|
#endif
|
|
|
|
MCOUNT_RESTORE_REGS
|
|
.globl ftrace_stub
|
|
ftrace_stub:
|
|
RETURN_BACK
|
|
END(ftrace_caller)
|
|
|
|
#else /* ! CONFIG_DYNAMIC_FTRACE */
|
|
|
|
NESTED(_mcount, PT_SIZE, ra)
|
|
lw t1, function_trace_stop
|
|
bnez t1, ftrace_stub
|
|
nop
|
|
PTR_LA t1, ftrace_stub
|
|
PTR_L t2, ftrace_trace_function /* Prepare t2 for (1) */
|
|
bne t1, t2, static_trace
|
|
nop
|
|
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
PTR_L t3, ftrace_graph_return
|
|
bne t1, t3, ftrace_graph_caller
|
|
nop
|
|
PTR_LA t1, ftrace_graph_entry_stub
|
|
PTR_L t3, ftrace_graph_entry
|
|
bne t1, t3, ftrace_graph_caller
|
|
nop
|
|
#endif
|
|
b ftrace_stub
|
|
nop
|
|
|
|
static_trace:
|
|
MCOUNT_SAVE_REGS
|
|
|
|
move a0, ra /* arg1: next ip, selfaddr */
|
|
jalr t2 /* (1) call *ftrace_trace_function */
|
|
move a1, AT /* arg2: the caller's next ip, parent */
|
|
|
|
MCOUNT_RESTORE_REGS
|
|
.globl ftrace_stub
|
|
ftrace_stub:
|
|
RETURN_BACK
|
|
END(_mcount)
|
|
|
|
#endif /* ! CONFIG_DYNAMIC_FTRACE */
|
|
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
|
|
NESTED(ftrace_graph_caller, PT_SIZE, ra)
|
|
#ifdef CONFIG_DYNAMIC_FTRACE
|
|
PTR_L a1, PT_R31(sp) /* load the original ra from the stack */
|
|
#ifdef KBUILD_MCOUNT_RA_ADDRESS
|
|
PTR_L t0, PT_R12(sp) /* load the original t0 from the stack */
|
|
#endif
|
|
#else
|
|
MCOUNT_SAVE_REGS
|
|
move a1, ra /* arg2: next ip, selfaddr */
|
|
#endif
|
|
|
|
#ifdef KBUILD_MCOUNT_RA_ADDRESS
|
|
bnez t0, 1f /* non-leaf func: t0 saved the location of the return address */
|
|
nop
|
|
PTR_LA t0, PT_R1(sp) /* leaf func: get the location of at(old ra) from our own stack */
|
|
1: move a0, t0 /* arg1: the location of the return address */
|
|
#else
|
|
PTR_LA a0, PT_R1(sp) /* arg1: &AT -> a0 */
|
|
#endif
|
|
jal prepare_ftrace_return
|
|
#ifdef CONFIG_FRAME_POINTER
|
|
move a2, fp /* arg3: frame pointer */
|
|
#else
|
|
#ifdef CONFIG_64BIT
|
|
PTR_LA a2, PT_SIZE(sp)
|
|
#else
|
|
PTR_LA a2, (PT_SIZE+8)(sp)
|
|
#endif
|
|
#endif
|
|
|
|
MCOUNT_RESTORE_REGS
|
|
RETURN_BACK
|
|
END(ftrace_graph_caller)
|
|
|
|
.align 2
|
|
.globl return_to_handler
|
|
return_to_handler:
|
|
PTR_SUBU sp, PT_SIZE
|
|
PTR_S v0, PT_R2(sp)
|
|
|
|
jal ftrace_return_to_handler
|
|
PTR_S v1, PT_R3(sp)
|
|
|
|
/* restore the real parent address: v0 -> ra */
|
|
move ra, v0
|
|
|
|
PTR_L v0, PT_R2(sp)
|
|
PTR_L v1, PT_R3(sp)
|
|
jr ra
|
|
PTR_ADDIU sp, PT_SIZE
|
|
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
|
|
|
|
.set at
|
|
.set reorder
|