diff options
Diffstat (limited to 'sys/powerpc/aim/trap.c')
| -rw-r--r-- | sys/powerpc/aim/trap.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/sys/powerpc/aim/trap.c b/sys/powerpc/aim/trap.c index b55d34b..d30aded 100644 --- a/sys/powerpc/aim/trap.c +++ b/sys/powerpc/aim/trap.c @@ -35,6 +35,7 @@ __FBSDID("$FreeBSD$"); #include "opt_hwpmc_hooks.h" +#include "opt_kdtrace.h" #include <sys/param.h> #include <sys/kdb.h> @@ -104,6 +105,33 @@ struct powerpc_exception { char *name; }; +#ifdef KDTRACE_HOOKS +#include <sys/dtrace_bsd.h> + +/* + * This is a hook which is initialised by the dtrace module + * to handle traps which might occur during DTrace probe + * execution. + */ +dtrace_trap_func_t dtrace_trap_func; + +dtrace_doubletrap_func_t dtrace_doubletrap_func; + +/* + * This is a hook which is initialised by the systrace module + * when it is loaded. This keeps the DTrace syscall provider + * implementation opaque. + */ +systrace_probe_func_t systrace_probe_func; + +/* + * These hooks are necessary for the pid, usdt and fasttrap providers. + */ +dtrace_fasttrap_probe_ptr_t dtrace_fasttrap_probe_ptr; +dtrace_pid_probe_ptr_t dtrace_pid_probe_ptr; +dtrace_return_probe_ptr_t dtrace_return_probe_ptr; +#endif + static struct powerpc_exception powerpc_exceptions[] = { { 0x0100, "system reset" }, { 0x0200, "machine check" }, @@ -176,6 +204,28 @@ trap(struct trapframe *frame) } else #endif +#ifdef KDTRACE_HOOKS + /* + * A trap can occur while DTrace executes a probe. Before + * executing the probe, DTrace blocks re-scheduling and sets + * a flag in it's per-cpu flags to indicate that it doesn't + * want to fault. On returning from the probe, the no-fault + * flag is cleared and finally re-scheduling is enabled. + * + * If the DTrace kernel module has registered a trap handler, + * call it and if it returns non-zero, assume that it has + * handled the trap and modified the trap frame so that this + * function can return normally. + */ + /* + * XXXDTRACE: add fasttrap and pid probes handlers here (if ever) + */ + if (!user) { + if (dtrace_trap_func != NULL && (*dtrace_trap_func)(frame, type)) + return; + } +#endif + if (user) { td->td_pticks = 0; td->td_frame = frame; @@ -617,6 +667,9 @@ trap_pfault(struct trapframe *frame, int user) PROC_LOCK(p); --p->p_lock; PROC_UNLOCK(p); + /* + * XXXDTRACE: add dtrace_doubletrap_func here? + */ } else { /* * Don't have to worry about process locking or stacks in the |
