| /* |
| * 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 <wuzj@lemote.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 t0, function_trace_stop |
| bnez t0, ftrace_stub |
| nop |
| |
| MCOUNT_SAVE_REGS |
| |
| 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 */ |
| |
| MCOUNT_RESTORE_REGS |
| .globl ftrace_stub |
| ftrace_stub: |
| RETURN_BACK |
| END(ftrace_caller) |
| |
| #else /* ! CONFIG_DYNAMIC_FTRACE */ |
| |
| NESTED(_mcount, PT_SIZE, ra) |
| lw t0, function_trace_stop |
| bnez t0, ftrace_stub |
| nop |
| PTR_LA t0, ftrace_stub |
| PTR_L t1, ftrace_trace_function /* Prepare t1 for (1) */ |
| bne t0, t1, static_trace |
| nop |
| b ftrace_stub |
| nop |
| |
| static_trace: |
| MCOUNT_SAVE_REGS |
| |
| move a0, ra /* arg1: next ip, selfaddr */ |
| jalr t1 /* (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 */ |
| |
| .set at |
| .set reorder |