diff options
Diffstat (limited to 'arch/x86/include')
-rw-r--r-- | arch/x86/include/asm/ftrace.h | 8 | ||||
-rw-r--r-- | arch/x86/include/asm/livepatch.h | 8 | ||||
-rw-r--r-- | arch/x86/include/asm/text-patching.h | 30 |
3 files changed, 33 insertions, 13 deletions
diff --git a/arch/x86/include/asm/ftrace.h b/arch/x86/include/asm/ftrace.h index cf350639e76d..287f1f7b2e52 100644 --- a/arch/x86/include/asm/ftrace.h +++ b/arch/x86/include/asm/ftrace.h @@ -3,12 +3,10 @@ #define _ASM_X86_FTRACE_H #ifdef CONFIG_FUNCTION_TRACER -#ifdef CC_USING_FENTRY -# define MCOUNT_ADDR ((unsigned long)(__fentry__)) -#else -# define MCOUNT_ADDR ((unsigned long)(mcount)) -# define HAVE_FUNCTION_GRAPH_FP_TEST +#ifndef CC_USING_FENTRY +# error Compiler does not support fentry? #endif +# define MCOUNT_ADDR ((unsigned long)(__fentry__)) #define MCOUNT_INSN_SIZE 5 /* sizeof mcount call */ #ifdef CONFIG_DYNAMIC_FTRACE diff --git a/arch/x86/include/asm/livepatch.h b/arch/x86/include/asm/livepatch.h index ed80003ce3e2..a66f6706c2de 100644 --- a/arch/x86/include/asm/livepatch.h +++ b/arch/x86/include/asm/livepatch.h @@ -24,14 +24,6 @@ #include <asm/setup.h> #include <linux/ftrace.h> -static inline int klp_check_compiler_support(void) -{ -#ifndef CC_USING_FENTRY - return 1; -#endif - return 0; -} - static inline void klp_arch_set_pc(struct pt_regs *regs, unsigned long ip) { regs->ip = ip; diff --git a/arch/x86/include/asm/text-patching.h b/arch/x86/include/asm/text-patching.h index c90678fd391a..880b5515b1d6 100644 --- a/arch/x86/include/asm/text-patching.h +++ b/arch/x86/include/asm/text-patching.h @@ -42,4 +42,34 @@ extern int after_bootmem; extern __ro_after_init struct mm_struct *poking_mm; extern __ro_after_init unsigned long poking_addr; +#ifndef CONFIG_UML_X86 +static inline void int3_emulate_jmp(struct pt_regs *regs, unsigned long ip) +{ + regs->ip = ip; +} + +#define INT3_INSN_SIZE 1 +#define CALL_INSN_SIZE 5 + +#ifdef CONFIG_X86_64 +static inline void int3_emulate_push(struct pt_regs *regs, unsigned long val) +{ + /* + * The int3 handler in entry_64.S adds a gap between the + * stack where the break point happened, and the saving of + * pt_regs. We can extend the original stack because of + * this gap. See the idtentry macro's create_gap option. + */ + regs->sp -= sizeof(unsigned long); + *(unsigned long *)regs->sp = val; +} + +static inline void int3_emulate_call(struct pt_regs *regs, unsigned long func) +{ + int3_emulate_push(regs, regs->ip - INT3_INSN_SIZE + CALL_INSN_SIZE); + int3_emulate_jmp(regs, func); +} +#endif /* CONFIG_X86_64 */ +#endif /* !CONFIG_UML_X86 */ + #endif /* _ASM_X86_TEXT_PATCHING_H */ |