diff options
Diffstat (limited to 'arch/s390/kernel/ftrace.c')
| -rw-r--r-- | arch/s390/kernel/ftrace.c | 55 |
1 files changed, 16 insertions, 39 deletions
diff --git a/arch/s390/kernel/ftrace.c b/arch/s390/kernel/ftrace.c index 51439a71e392..e94bb98f5231 100644 --- a/arch/s390/kernel/ftrace.c +++ b/arch/s390/kernel/ftrace.c @@ -13,6 +13,7 @@ #include <linux/kernel.h> #include <linux/types.h> #include <linux/kmsan-checks.h> +#include <linux/cpufeature.h> #include <linux/kprobes.h> #include <linux/execmem.h> #include <trace/syscall.h> @@ -69,7 +70,7 @@ static const char *ftrace_shared_hotpatch_trampoline(const char **end) bool ftrace_need_init_nop(void) { - return !MACHINE_HAS_SEQ_INSN; + return !cpu_has_seq_insn(); } int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec) @@ -189,7 +190,7 @@ static int ftrace_modify_trampoline_call(struct dyn_ftrace *rec, int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr, unsigned long addr) { - if (MACHINE_HAS_SEQ_INSN) + if (cpu_has_seq_insn()) return ftrace_patch_branch_insn(rec->ip, old_addr, addr); else return ftrace_modify_trampoline_call(rec, old_addr, addr); @@ -213,8 +214,8 @@ static int ftrace_patch_branch_mask(void *addr, u16 expected, bool enable) int ftrace_make_nop(struct module *mod, struct dyn_ftrace *rec, unsigned long addr) { - /* Expect brcl 0xf,... for the !MACHINE_HAS_SEQ_INSN case */ - if (MACHINE_HAS_SEQ_INSN) + /* Expect brcl 0xf,... for the !cpu_has_seq_insn() case */ + if (cpu_has_seq_insn()) return ftrace_patch_branch_insn(rec->ip, addr, 0); else return ftrace_patch_branch_mask((void *)rec->ip, 0xc0f4, false); @@ -234,7 +235,7 @@ static int ftrace_make_trampoline_call(struct dyn_ftrace *rec, unsigned long add int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr) { - if (MACHINE_HAS_SEQ_INSN) + if (cpu_has_seq_insn()) return ftrace_patch_branch_insn(rec->ip, 0, addr); else return ftrace_make_trampoline_call(rec, addr); @@ -261,43 +262,19 @@ void ftrace_arch_code_modify_post_process(void) } #ifdef CONFIG_FUNCTION_GRAPH_TRACER -/* - * Hook the return address and push it in the stack of return addresses - * in current thread info. - */ -unsigned long prepare_ftrace_return(unsigned long ra, unsigned long sp, - unsigned long ip) -{ - if (unlikely(ftrace_graph_is_dead())) - goto out; - if (unlikely(atomic_read(¤t->tracing_graph_pause))) - goto out; - ip -= MCOUNT_INSN_SIZE; - if (!function_graph_enter(ra, ip, 0, (void *) sp)) - ra = (unsigned long) return_to_handler; -out: - return ra; -} -NOKPROBE_SYMBOL(prepare_ftrace_return); -/* - * Patch the kernel code at ftrace_graph_caller location. The instruction - * there is branch relative on condition. To enable the ftrace graph code - * block, we simply patch the mask field of the instruction to zero and - * turn the instruction into a nop. - * To disable the ftrace graph code the mask field will be patched to - * all ones, which turns the instruction into an unconditional branch. - */ -int ftrace_enable_ftrace_graph_caller(void) +void ftrace_graph_func(unsigned long ip, unsigned long parent_ip, + struct ftrace_ops *op, struct ftrace_regs *fregs) { - /* Expect brc 0xf,... */ - return ftrace_patch_branch_mask(ftrace_graph_caller, 0xa7f4, false); -} + unsigned long *parent = &arch_ftrace_regs(fregs)->regs.gprs[14]; + unsigned long sp = arch_ftrace_regs(fregs)->regs.gprs[15]; -int ftrace_disable_ftrace_graph_caller(void) -{ - /* Expect brc 0x0,... */ - return ftrace_patch_branch_mask(ftrace_graph_caller, 0xa704, true); + if (unlikely(ftrace_graph_is_dead())) + return; + if (unlikely(atomic_read(¤t->tracing_graph_pause))) + return; + if (!function_graph_enter_regs(*parent, ip, 0, (unsigned long *)sp, fregs)) + *parent = (unsigned long)&return_to_handler; } #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |