1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive for 4 * more details. 5 * 6 * Copyright (C) 2009 DSLab, Lanzhou University, China 7 * Author: Wu Zhangjin <wuzhangjin@gmail.com> 8 */ 9 10 #ifndef _ASM_MIPS_FTRACE_H 11 #define _ASM_MIPS_FTRACE_H 12 13 #ifdef CONFIG_FUNCTION_TRACER 14 15 #define MCOUNT_ADDR ((unsigned long)(_mcount)) 16 #define MCOUNT_INSN_SIZE 4 /* sizeof mcount call */ 17 18 #ifndef __ASSEMBLY__ 19 extern void _mcount(void); 20 #define mcount _mcount 21 22 #define safe_load(load, src, dst, error) \ 23 do { \ 24 asm volatile ( \ 25 "1: " load " %[tmp_dst], 0(%[tmp_src])\n" \ 26 " li %[tmp_err], 0\n" \ 27 "2: .insn\n" \ 28 \ 29 ".section .fixup, \"ax\"\n" \ 30 "3: li %[tmp_err], 1\n" \ 31 " j 2b\n" \ 32 ".previous\n" \ 33 \ 34 ".section\t__ex_table,\"a\"\n\t" \ 35 STR(PTR_WD) "\t1b, 3b\n\t" \ 36 ".previous\n" \ 37 \ 38 : [tmp_dst] "=&r" (dst), [tmp_err] "=r" (error)\ 39 : [tmp_src] "r" (src) \ 40 : "memory" \ 41 ); \ 42 } while (0) 43 44 #define safe_store(store, src, dst, error) \ 45 do { \ 46 asm volatile ( \ 47 "1: " store " %[tmp_src], 0(%[tmp_dst])\n"\ 48 " li %[tmp_err], 0\n" \ 49 "2: .insn\n" \ 50 \ 51 ".section .fixup, \"ax\"\n" \ 52 "3: li %[tmp_err], 1\n" \ 53 " j 2b\n" \ 54 ".previous\n" \ 55 \ 56 ".section\t__ex_table,\"a\"\n\t"\ 57 STR(PTR_WD) "\t1b, 3b\n\t" \ 58 ".previous\n" \ 59 \ 60 : [tmp_err] "=r" (error) \ 61 : [tmp_dst] "r" (dst), [tmp_src] "r" (src)\ 62 : "memory" \ 63 ); \ 64 } while (0) 65 66 #define safe_load_code(dst, src, error) \ 67 safe_load(STR(lw), src, dst, error) 68 #define safe_store_code(src, dst, error) \ 69 safe_store(STR(sw), src, dst, error) 70 71 #define safe_load_stack(dst, src, error) \ 72 safe_load(STR(PTR_L), src, dst, error) 73 74 #define safe_store_stack(src, dst, error) \ 75 safe_store(STR(PTR_S), src, dst, error) 76 77 78 #ifdef CONFIG_DYNAMIC_FTRACE 79 static inline unsigned long ftrace_call_adjust(unsigned long addr) 80 { 81 return addr; 82 } 83 84 struct dyn_arch_ftrace { 85 }; 86 87 #endif /* CONFIG_DYNAMIC_FTRACE */ 88 #endif /* __ASSEMBLY__ */ 89 #endif /* CONFIG_FUNCTION_TRACER */ 90 #endif /* _ASM_MIPS_FTRACE_H */ 91