diff options
| -rw-r--r-- | arch/sh/Kconfig | 1 | ||||
| -rw-r--r-- | arch/sh/include/asm/syscall_32.h | 1 | ||||
| -rw-r--r-- | arch/sh/include/asm/thread_info.h | 11 | ||||
| -rw-r--r-- | arch/sh/kernel/Makefile_32 | 1 | ||||
| -rw-r--r-- | arch/sh/kernel/entry-common.S | 18 | ||||
| -rw-r--r-- | arch/sh/kernel/ftrace.c | 68 | ||||
| -rw-r--r-- | arch/sh/kernel/ptrace_32.c | 8 | ||||
| -rw-r--r-- | arch/sh/lib/mcount.S | 2 |
8 files changed, 100 insertions, 10 deletions
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig index 801a4a79ffe3..29e41ec6537d 100644 --- a/arch/sh/Kconfig +++ b/arch/sh/Kconfig @@ -32,6 +32,7 @@ config SUPERH32 select HAVE_FTRACE_MCOUNT_RECORD select HAVE_DYNAMIC_FTRACE select HAVE_FUNCTION_TRACE_MCOUNT_TEST + select HAVE_FTRACE_SYSCALLS select HAVE_ARCH_KGDB select ARCH_HIBERNATION_POSSIBLE if MMU diff --git a/arch/sh/include/asm/syscall_32.h b/arch/sh/include/asm/syscall_32.h index 6f83f2cc45c1..7d80df4f09cb 100644 --- a/arch/sh/include/asm/syscall_32.h +++ b/arch/sh/include/asm/syscall_32.h @@ -65,6 +65,7 @@ static inline void syscall_get_arguments(struct task_struct *task, case 3: args[2] = regs->regs[6]; case 2: args[1] = regs->regs[5]; case 1: args[0] = regs->regs[4]; + case 0: break; default: BUG(); diff --git a/arch/sh/include/asm/thread_info.h b/arch/sh/include/asm/thread_info.h index f09ac4806294..499e315f4be2 100644 --- a/arch/sh/include/asm/thread_info.h +++ b/arch/sh/include/asm/thread_info.h @@ -97,7 +97,7 @@ static inline struct thread_info *current_thread_info(void) extern struct thread_info *alloc_thread_info(struct task_struct *tsk); extern void free_thread_info(struct thread_info *ti); - + #endif /* THREAD_SHIFT < PAGE_SHIFT */ #endif /* __ASSEMBLY__ */ @@ -116,6 +116,7 @@ extern void free_thread_info(struct thread_info *ti); #define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */ #define TIF_SECCOMP 6 /* secure computing */ #define TIF_NOTIFY_RESUME 7 /* callback before returning to user */ +#define TIF_SYSCALL_FTRACE 8 /* for ftrace syscall instrumentation */ #define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */ #define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */ #define TIF_MEMDIE 18 @@ -129,25 +130,27 @@ extern void free_thread_info(struct thread_info *ti); #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) #define _TIF_SECCOMP (1 << TIF_SECCOMP) #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) +#define _TIF_SYSCALL_FTRACE (1 << TIF_SYSCALL_FTRACE) #define _TIF_USEDFPU (1 << TIF_USEDFPU) #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) #define _TIF_FREEZE (1 << TIF_FREEZE) /* - * _TIF_ALLWORK_MASK and _TIF_WORK_MASK need to fit within a byte, or we + * _TIF_ALLWORK_MASK and _TIF_WORK_MASK need to fit within 2 bytes, or we * blow the tst immediate size constraints and need to fix up * arch/sh/kernel/entry-common.S. */ /* work to do in syscall trace */ #define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \ - _TIF_SYSCALL_AUDIT | _TIF_SECCOMP) + _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \ + _TIF_SYSCALL_FTRACE) /* work to do on any return to u-space */ #define _TIF_ALLWORK_MASK (_TIF_SYSCALL_TRACE | _TIF_SIGPENDING | \ _TIF_NEED_RESCHED | _TIF_SYSCALL_AUDIT | \ _TIF_SINGLESTEP | _TIF_RESTORE_SIGMASK | \ - _TIF_NOTIFY_RESUME) + _TIF_NOTIFY_RESUME | _TIF_SYSCALL_FTRACE) /* work to do on interrupt/exception return */ #define _TIF_WORK_MASK (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \ diff --git a/arch/sh/kernel/Makefile_32 b/arch/sh/kernel/Makefile_32 index 9411e3e31e68..fee924a9c46c 100644 --- a/arch/sh/kernel/Makefile_32 +++ b/arch/sh/kernel/Makefile_32 @@ -29,6 +29,7 @@ obj-$(CONFIG_IO_TRAPPED) += io_trapped.o obj-$(CONFIG_KPROBES) += kprobes.o obj-$(CONFIG_GENERIC_GPIO) += gpio.o obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o +obj-$(CONFIG_FTRACE_SYSCALLS) += ftrace.o obj-$(CONFIG_DUMP_CODE) += disassemble.o obj-$(CONFIG_HIBERNATION) += swsusp.o diff --git a/arch/sh/kernel/entry-common.S b/arch/sh/kernel/entry-common.S index d62359cfbbe2..d62175650c54 100644 --- a/arch/sh/kernel/entry-common.S +++ b/arch/sh/kernel/entry-common.S @@ -131,7 +131,7 @@ ENTRY(resume_userspace) nop #endif mov.l @(TI_FLAGS,r8), r0 ! current_thread_info->flags - tst #_TIF_WORK_MASK, r0 + tst #(_TIF_WORK_MASK & 0xff), r0 bt/s __restore_all tst #_TIF_NEED_RESCHED, r0 @@ -163,7 +163,7 @@ work_resched: #endif ! mov.l @(TI_FLAGS,r8), r0 ! current_thread_info->flags - tst #_TIF_WORK_MASK, r0 + tst #(_TIF_WORK_MASK & 0xff), r0 bt __restore_all bra work_pending tst #_TIF_NEED_RESCHED, r0 @@ -181,7 +181,7 @@ work_resched: syscall_exit_work: ! r0: current_thread_info->flags ! r8: current_thread_info - tst #_TIF_WORK_SYSCALL_MASK, r0 + tst #(_TIF_WORK_SYSCALL_MASK & 0xff), r0 bt/s work_pending tst #_TIF_NEED_RESCHED, r0 #ifdef CONFIG_TRACE_IRQFLAGS @@ -331,8 +331,12 @@ ENTRY(system_call) ! get_current_thread_info r8, r10 mov.l @(TI_FLAGS,r8), r8 - mov #_TIF_WORK_SYSCALL_MASK, r10 + mov #(_TIF_WORK_SYSCALL_MASK & 0xff), r10 + mov #(_TIF_WORK_SYSCALL_MASK >> 8), r9 tst r10, r8 + shll8 r9 + bf syscall_trace_entry + tst r9, r8 bf syscall_trace_entry ! mov.l 2f, r8 ! Number of syscalls @@ -359,7 +363,11 @@ syscall_exit: ! get_current_thread_info r8, r0 mov.l @(TI_FLAGS,r8), r0 ! current_thread_info->flags - tst #_TIF_ALLWORK_MASK, r0 + tst #(_TIF_ALLWORK_MASK & 0xff), r0 + mov #(_TIF_ALLWORK_MASK >> 8), r1 + bf syscall_exit_work + shlr8 r0 + tst r0, r1 bf syscall_exit_work bra __restore_all nop diff --git a/arch/sh/kernel/ftrace.c b/arch/sh/kernel/ftrace.c index 066f37dc32a9..4f62eced0aec 100644 --- a/arch/sh/kernel/ftrace.c +++ b/arch/sh/kernel/ftrace.c @@ -18,6 +18,8 @@ #include <linux/io.h> #include <asm/ftrace.h> #include <asm/cacheflush.h> +#include <asm/unistd.h> +#include <trace/syscall.h> static unsigned char ftrace_replaced_code[MCOUNT_INSN_SIZE]; @@ -131,3 +133,69 @@ int __init ftrace_dyn_arch_init(void *data) return 0; } + +#ifdef CONFIG_FTRACE_SYSCALLS + +extern unsigned long __start_syscalls_metadata[]; +extern unsigned long __stop_syscalls_metadata[]; +extern unsigned long *sys_call_table; + +static struct syscall_metadata **syscalls_metadata; + +static struct syscall_metadata *find_syscall_meta(unsigned long *syscall) +{ + struct syscall_metadata *start; + struct syscall_metadata *stop; + char str[KSYM_SYMBOL_LEN]; + + + start = (struct syscall_metadata *)__start_syscalls_metadata; + stop = (struct syscall_metadata *)__stop_syscalls_metadata; + kallsyms_lookup((unsigned long) syscall, NULL, NULL, NULL, str); + + for ( ; start < stop; start++) { + if (start->name && !strcmp(start->name, str)) + return start; + } + + return NULL; +} + +#define FTRACE_SYSCALL_MAX (NR_syscalls - 1) + +struct syscall_metadata *syscall_nr_to_meta(int nr) +{ + if (!syscalls_metadata || nr >= FTRACE_SYSCALL_MAX || nr < 0) + return NULL; + + return syscalls_metadata[nr]; +} + +void arch_init_ftrace_syscalls(void) +{ + int i; + struct syscall_metadata *meta; + unsigned long **psys_syscall_table = &sys_call_table; + static atomic_t refs; + + if (atomic_inc_return(&refs) != 1) + goto end; + + syscalls_metadata = kzalloc(sizeof(*syscalls_metadata) * + FTRACE_SYSCALL_MAX, GFP_KERNEL); + if (!syscalls_metadata) { + WARN_ON(1); + return; + } + + for (i = 0; i < FTRACE_SYSCALL_MAX; i++) { + meta = find_syscall_meta(psys_syscall_table[i]); + syscalls_metadata[i] = meta; + } + return; + + /* Paranoid: avoid overflow */ +end: + atomic_dec(&refs); +} +#endif /* CONFIG_FTRACE_SYSCALLS */ diff --git a/arch/sh/kernel/ptrace_32.c b/arch/sh/kernel/ptrace_32.c index 3392e835a374..c198eceaee94 100644 --- a/arch/sh/kernel/ptrace_32.c +++ b/arch/sh/kernel/ptrace_32.c @@ -34,6 +34,8 @@ #include <asm/syscalls.h> #include <asm/fpu.h> +#include <trace/syscall.h> + /* * This routine will get a word off of the process kernel stack. */ @@ -459,6 +461,9 @@ asmlinkage long do_syscall_trace_enter(struct pt_regs *regs) */ ret = -1L; + if (unlikely(test_thread_flag(TIF_SYSCALL_FTRACE))) + ftrace_syscall_enter(regs); + if (unlikely(current->audit_context)) audit_syscall_entry(audit_arch(), regs->regs[3], regs->regs[4], regs->regs[5], @@ -475,6 +480,9 @@ asmlinkage void do_syscall_trace_leave(struct pt_regs *regs) audit_syscall_exit(AUDITSC_RESULT(regs->regs[0]), regs->regs[0]); + if (unlikely(test_thread_flag(TIF_SYSCALL_FTRACE))) + ftrace_syscall_exit(regs); + step = test_thread_flag(TIF_SINGLESTEP); if (step || test_thread_flag(TIF_SYSCALL_TRACE)) tracehook_report_syscall_exit(regs, step); diff --git a/arch/sh/lib/mcount.S b/arch/sh/lib/mcount.S index cb87ef580b31..71e87f9b4fda 100644 --- a/arch/sh/lib/mcount.S +++ b/arch/sh/lib/mcount.S @@ -72,7 +72,7 @@ ftrace_caller: mov.l @r0, r0 tst r0, r0 bf ftrace_stub - + MCOUNT_ENTER() .globl ftrace_call |