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Diffstat (limited to 'arch/powerpc/include/asm/ftrace.h')
| -rw-r--r-- | arch/powerpc/include/asm/ftrace.h | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/ftrace.h b/arch/powerpc/include/asm/ftrace.h new file mode 100644 index 000000000..9e5a39b6a --- /dev/null +++ b/arch/powerpc/include/asm/ftrace.h @@ -0,0 +1,150 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_POWERPC_FTRACE +#define _ASM_POWERPC_FTRACE + +#include <asm/types.h> + +#ifdef CONFIG_FUNCTION_TRACER +#define MCOUNT_ADDR ((unsigned long)(_mcount)) +#define MCOUNT_INSN_SIZE 4 /* sizeof mcount call */ + +#define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR + +/* Ignore unused weak functions which will have larger offsets */ +#if defined(CONFIG_MPROFILE_KERNEL) || defined(CONFIG_ARCH_USING_PATCHABLE_FUNCTION_ENTRY) +#define FTRACE_MCOUNT_MAX_OFFSET 16 +#elif defined(CONFIG_PPC32) +#define FTRACE_MCOUNT_MAX_OFFSET 8 +#endif + +#ifndef __ASSEMBLY__ +extern void _mcount(void); + +static inline unsigned long ftrace_call_adjust(unsigned long addr) +{ + if (IS_ENABLED(CONFIG_ARCH_USING_PATCHABLE_FUNCTION_ENTRY)) + addr += MCOUNT_INSN_SIZE; + + return addr; +} + +unsigned long prepare_ftrace_return(unsigned long parent, unsigned long ip, + unsigned long sp); + +struct module; +struct dyn_ftrace; +struct dyn_arch_ftrace { + struct module *mod; +}; + +#ifdef CONFIG_DYNAMIC_FTRACE_WITH_ARGS +#define ftrace_need_init_nop() (true) +int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec); +#define ftrace_init_nop ftrace_init_nop + +struct ftrace_regs { + struct pt_regs regs; +}; + +static __always_inline struct pt_regs *arch_ftrace_get_regs(struct ftrace_regs *fregs) +{ + /* We clear regs.msr in ftrace_call */ + return fregs->regs.msr ? &fregs->regs : NULL; +} + +static __always_inline void +ftrace_regs_set_instruction_pointer(struct ftrace_regs *fregs, + unsigned long ip) +{ + regs_set_return_ip(&fregs->regs, ip); +} + +static __always_inline unsigned long +ftrace_regs_get_instruction_pointer(struct ftrace_regs *fregs) +{ + return instruction_pointer(&fregs->regs); +} + +#define ftrace_regs_get_argument(fregs, n) \ + regs_get_kernel_argument(&(fregs)->regs, n) +#define ftrace_regs_get_stack_pointer(fregs) \ + kernel_stack_pointer(&(fregs)->regs) +#define ftrace_regs_return_value(fregs) \ + regs_return_value(&(fregs)->regs) +#define ftrace_regs_set_return_value(fregs, ret) \ + regs_set_return_value(&(fregs)->regs, ret) +#define ftrace_override_function_with_return(fregs) \ + override_function_with_return(&(fregs)->regs) +#define ftrace_regs_query_register_offset(name) \ + regs_query_register_offset(name) + +struct ftrace_ops; + +#define ftrace_graph_func ftrace_graph_func +void ftrace_graph_func(unsigned long ip, unsigned long parent_ip, + struct ftrace_ops *op, struct ftrace_regs *fregs); +#endif +#endif /* __ASSEMBLY__ */ + +#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS +#define ARCH_SUPPORTS_FTRACE_OPS 1 +#endif +#endif /* CONFIG_FUNCTION_TRACER */ + +#ifndef __ASSEMBLY__ +#ifdef CONFIG_FTRACE_SYSCALLS +/* + * Some syscall entry functions on powerpc start with "ppc_" (fork and clone, + * for instance) or ppc32_/ppc64_. We should also match the sys_ variant with + * those. + */ +#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME +static inline bool arch_syscall_match_sym_name(const char *sym, const char *name) +{ + return !strcmp(sym, name) || + (!strncmp(sym, "__se_sys", 8) && !strcmp(sym + 5, name)) || + (!strncmp(sym, "ppc_", 4) && !strcmp(sym + 4, name + 4)) || + (!strncmp(sym, "ppc32_", 6) && !strcmp(sym + 6, name + 4)) || + (!strncmp(sym, "ppc64_", 6) && !strcmp(sym + 6, name + 4)); +} +#endif /* CONFIG_FTRACE_SYSCALLS */ + +#if defined(CONFIG_PPC64) && defined(CONFIG_FUNCTION_TRACER) +#include <asm/paca.h> + +static inline void this_cpu_disable_ftrace(void) +{ + get_paca()->ftrace_enabled = 0; +} + +static inline void this_cpu_enable_ftrace(void) +{ + get_paca()->ftrace_enabled = 1; +} + +/* Disable ftrace on this CPU if possible (may not be implemented) */ +static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled) +{ + get_paca()->ftrace_enabled = ftrace_enabled; +} + +static inline u8 this_cpu_get_ftrace_enabled(void) +{ + return get_paca()->ftrace_enabled; +} +#else /* CONFIG_PPC64 */ +static inline void this_cpu_disable_ftrace(void) { } +static inline void this_cpu_enable_ftrace(void) { } +static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled) { } +static inline u8 this_cpu_get_ftrace_enabled(void) { return 1; } +#endif /* CONFIG_PPC64 */ + +#ifdef CONFIG_FUNCTION_TRACER +extern unsigned int ftrace_tramp_text[], ftrace_tramp_init[]; +void ftrace_free_init_tramp(void); +#else +static inline void ftrace_free_init_tramp(void) { } +#endif +#endif /* !__ASSEMBLY__ */ + +#endif /* _ASM_POWERPC_FTRACE */ |