1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_POWERPC_FTRACE 3 #define _ASM_POWERPC_FTRACE 4 5 #include <asm/types.h> 6 7 #ifdef CONFIG_FUNCTION_TRACER 8 #define MCOUNT_ADDR ((unsigned long)(_mcount)) 9 #define MCOUNT_INSN_SIZE 4 /* sizeof mcount call */ 10 11 #define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR 12 13 #ifdef __ASSEMBLY__ 14 15 /* Based off of objdump optput from glibc */ 16 17 #define MCOUNT_SAVE_FRAME \ 18 stwu r1,-48(r1); \ 19 stw r3, 12(r1); \ 20 stw r4, 16(r1); \ 21 stw r5, 20(r1); \ 22 stw r6, 24(r1); \ 23 mflr r3; \ 24 lwz r4, 52(r1); \ 25 mfcr r5; \ 26 stw r7, 28(r1); \ 27 stw r8, 32(r1); \ 28 stw r9, 36(r1); \ 29 stw r10,40(r1); \ 30 stw r3, 44(r1); \ 31 stw r5, 8(r1) 32 33 #define MCOUNT_RESTORE_FRAME \ 34 lwz r6, 8(r1); \ 35 lwz r0, 44(r1); \ 36 lwz r3, 12(r1); \ 37 mtctr r0; \ 38 lwz r4, 16(r1); \ 39 mtcr r6; \ 40 lwz r5, 20(r1); \ 41 lwz r6, 24(r1); \ 42 lwz r0, 52(r1); \ 43 lwz r7, 28(r1); \ 44 lwz r8, 32(r1); \ 45 mtlr r0; \ 46 lwz r9, 36(r1); \ 47 lwz r10,40(r1); \ 48 addi r1, r1, 48 49 50 #else /* !__ASSEMBLY__ */ 51 extern void _mcount(void); 52 53 static inline unsigned long ftrace_call_adjust(unsigned long addr) 54 { 55 /* reloction of mcount call site is the same as the address */ 56 return addr; 57 } 58 59 struct dyn_arch_ftrace { 60 struct module *mod; 61 }; 62 #endif /* __ASSEMBLY__ */ 63 64 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS 65 #define ARCH_SUPPORTS_FTRACE_OPS 1 66 #endif 67 #endif /* CONFIG_FUNCTION_TRACER */ 68 69 #ifndef __ASSEMBLY__ 70 #ifdef CONFIG_FTRACE_SYSCALLS 71 /* 72 * Some syscall entry functions on powerpc start with "ppc_" (fork and clone, 73 * for instance) or ppc32_/ppc64_. We should also match the sys_ variant with 74 * those. 75 */ 76 #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME 77 #ifdef PPC64_ELF_ABI_v1 78 static inline bool arch_syscall_match_sym_name(const char *sym, const char *name) 79 { 80 /* We need to skip past the initial dot, and the __se_sys alias */ 81 return !strcmp(sym + 1, name) || 82 (!strncmp(sym, ".__se_sys", 9) && !strcmp(sym + 6, name)) || 83 (!strncmp(sym, ".ppc_", 5) && !strcmp(sym + 5, name + 4)) || 84 (!strncmp(sym, ".ppc32_", 7) && !strcmp(sym + 7, name + 4)) || 85 (!strncmp(sym, ".ppc64_", 7) && !strcmp(sym + 7, name + 4)); 86 } 87 #else 88 static inline bool arch_syscall_match_sym_name(const char *sym, const char *name) 89 { 90 return !strcmp(sym, name) || 91 (!strncmp(sym, "__se_sys", 8) && !strcmp(sym + 5, name)) || 92 (!strncmp(sym, "ppc_", 4) && !strcmp(sym + 4, name + 4)) || 93 (!strncmp(sym, "ppc32_", 6) && !strcmp(sym + 6, name + 4)) || 94 (!strncmp(sym, "ppc64_", 6) && !strcmp(sym + 6, name + 4)); 95 } 96 #endif /* PPC64_ELF_ABI_v1 */ 97 #endif /* CONFIG_FTRACE_SYSCALLS */ 98 99 #ifdef CONFIG_PPC64 100 #include <asm/paca.h> 101 102 static inline void this_cpu_disable_ftrace(void) 103 { 104 get_paca()->ftrace_enabled = 0; 105 } 106 107 static inline void this_cpu_enable_ftrace(void) 108 { 109 get_paca()->ftrace_enabled = 1; 110 } 111 112 /* Disable ftrace on this CPU if possible (may not be implemented) */ 113 static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled) 114 { 115 get_paca()->ftrace_enabled = ftrace_enabled; 116 } 117 118 static inline u8 this_cpu_get_ftrace_enabled(void) 119 { 120 return get_paca()->ftrace_enabled; 121 } 122 123 #else /* CONFIG_PPC64 */ 124 static inline void this_cpu_disable_ftrace(void) { } 125 static inline void this_cpu_enable_ftrace(void) { } 126 static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled) { } 127 static inline u8 this_cpu_get_ftrace_enabled(void) { return 1; } 128 #endif /* CONFIG_PPC64 */ 129 #endif /* !__ASSEMBLY__ */ 130 131 #endif /* _ASM_POWERPC_FTRACE */ 132