diff options
| -rw-r--r-- | arch/powerpc/include/asm/thread_info.h | 4 | ||||
| -rw-r--r-- | arch/powerpc/include/uapi/asm/ptrace.h | 4 | ||||
| -rw-r--r-- | arch/powerpc/kernel/ptrace.c | 11 |
3 files changed, 18 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/thread_info.h b/arch/powerpc/include/asm/thread_info.h index 1a52e14ec3ee..3185f8ac1182 100644 --- a/arch/powerpc/include/asm/thread_info.h +++ b/arch/powerpc/include/asm/thread_info.h @@ -81,6 +81,7 @@ extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src #define TIF_SIGPENDING 1 /* signal pending */ #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ #define TIF_FSCHECK 3 /* Check FS is USER_DS on return */ +#define TIF_SYSCALL_EMU 4 /* syscall emulation active */ #define TIF_RESTORE_TM 5 /* need to restore TM FP/VEC/VSX */ #define TIF_PATCH_PENDING 6 /* pending live patching update */ #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */ @@ -120,9 +121,10 @@ extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src #define _TIF_EMULATE_STACK_STORE (1<<TIF_EMULATE_STACK_STORE) #define _TIF_NOHZ (1<<TIF_NOHZ) #define _TIF_FSCHECK (1<<TIF_FSCHECK) +#define _TIF_SYSCALL_EMU (1<<TIF_SYSCALL_EMU) #define _TIF_SYSCALL_DOTRACE (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \ _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT | \ - _TIF_NOHZ) + _TIF_NOHZ | _TIF_SYSCALL_EMU) #define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \ _TIF_NOTIFY_RESUME | _TIF_UPROBE | \ diff --git a/arch/powerpc/include/uapi/asm/ptrace.h b/arch/powerpc/include/uapi/asm/ptrace.h index 5e3edc2a7634..55c7a131d2ab 100644 --- a/arch/powerpc/include/uapi/asm/ptrace.h +++ b/arch/powerpc/include/uapi/asm/ptrace.h @@ -160,6 +160,10 @@ struct pt_regs { #define PTRACE_GETVSRREGS 0x1b #define PTRACE_SETVSRREGS 0x1c +/* Syscall emulation defines */ +#define PTRACE_SYSEMU 0x1d +#define PTRACE_SYSEMU_SINGLESTEP 0x1e + /* * Get or set a debug register. The first 16 are DABR registers and the * second 16 are IABR registers. diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c index 9667666eb18e..4e372f54088f 100644 --- a/arch/powerpc/kernel/ptrace.c +++ b/arch/powerpc/kernel/ptrace.c @@ -2508,6 +2508,7 @@ void ptrace_disable(struct task_struct *child) { /* make sure the single step bit is not set. */ user_disable_single_step(child); + clear_tsk_thread_flag(child, TIF_SYSCALL_EMU); } #ifdef CONFIG_PPC_ADV_DEBUG_REGS @@ -3264,6 +3265,16 @@ long do_syscall_trace_enter(struct pt_regs *regs) { user_exit(); + if (test_thread_flag(TIF_SYSCALL_EMU)) { + ptrace_report_syscall(regs); + /* + * Returning -1 will skip the syscall execution. We want to + * avoid clobbering any register also, thus, not 'gotoing' + * skip label. + */ + return -1; + } + /* * The tracer may decide to abort the syscall, if so tracehook * will return !0. Note that the tracer may also just change |