diff options
Diffstat (limited to 'arch/arm64/include/asm/ftrace.h')
| -rw-r--r-- | arch/arm64/include/asm/ftrace.h | 72 |
1 files changed, 66 insertions, 6 deletions
diff --git a/arch/arm64/include/asm/ftrace.h b/arch/arm64/include/asm/ftrace.h index 329dbbd4d50b..5664729800ae 100644 --- a/arch/arm64/include/asm/ftrace.h +++ b/arch/arm64/include/asm/ftrace.h @@ -23,7 +23,7 @@ */ #define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR -#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS +#ifdef CONFIG_DYNAMIC_FTRACE_WITH_ARGS #define ARCH_SUPPORTS_FTRACE_OPS 1 #else #define MCOUNT_ADDR ((unsigned long)_mcount) @@ -33,8 +33,7 @@ #define MCOUNT_INSN_SIZE AARCH64_INSN_SIZE #define FTRACE_PLT_IDX 0 -#define FTRACE_REGS_PLT_IDX 1 -#define NR_FTRACE_PLTS 2 +#define NR_FTRACE_PLTS 1 /* * Currently, gcc tends to save the link register after the local variables @@ -69,7 +68,7 @@ static inline unsigned long ftrace_call_adjust(unsigned long addr) * Adjust addr to point at the BL in the callsite. * See ftrace_init_nop() for the callsite sequence. */ - if (IS_ENABLED(CONFIG_DYNAMIC_FTRACE_WITH_REGS)) + if (IS_ENABLED(CONFIG_DYNAMIC_FTRACE_WITH_ARGS)) return addr + AARCH64_INSN_SIZE; /* * addr is the address of the mcount call instruction. @@ -78,10 +77,71 @@ static inline unsigned long ftrace_call_adjust(unsigned long addr) return addr; } -#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS +#ifdef CONFIG_DYNAMIC_FTRACE_WITH_ARGS struct dyn_ftrace; struct ftrace_ops; -struct ftrace_regs; + +#define arch_ftrace_get_regs(regs) NULL + +struct ftrace_regs { + /* x0 - x8 */ + unsigned long regs[9]; + unsigned long __unused; + + unsigned long fp; + unsigned long lr; + + unsigned long sp; + unsigned long pc; +}; + +static __always_inline unsigned long +ftrace_regs_get_instruction_pointer(const struct ftrace_regs *fregs) +{ + return fregs->pc; +} + +static __always_inline void +ftrace_regs_set_instruction_pointer(struct ftrace_regs *fregs, + unsigned long pc) +{ + fregs->pc = pc; +} + +static __always_inline unsigned long +ftrace_regs_get_stack_pointer(const struct ftrace_regs *fregs) +{ + return fregs->sp; +} + +static __always_inline unsigned long +ftrace_regs_get_argument(struct ftrace_regs *fregs, unsigned int n) +{ + if (n < 8) + return fregs->regs[n]; + return 0; +} + +static __always_inline unsigned long +ftrace_regs_get_return_value(const struct ftrace_regs *fregs) +{ + return fregs->regs[0]; +} + +static __always_inline void +ftrace_regs_set_return_value(struct ftrace_regs *fregs, + unsigned long ret) +{ + fregs->regs[0] = ret; +} + +static __always_inline void +ftrace_override_function_with_return(struct ftrace_regs *fregs) +{ + fregs->pc = fregs->lr; +} + +int ftrace_regs_query_register_offset(const char *name); int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec); #define ftrace_init_nop ftrace_init_nop |