diff options
Diffstat (limited to 'tapsets.cxx')
| -rw-r--r-- | tapsets.cxx | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/tapsets.cxx b/tapsets.cxx index 2d68ddd4..bd33fb0b 100644 --- a/tapsets.cxx +++ b/tapsets.cxx @@ -2986,7 +2986,18 @@ dwarf_derived_probe_group::emit_module_decls (systemtap_session& s) s.op->line() << "];"; common_probe_entryfn_prologue (s.op, "STAP_SESSION_RUNNING", "sdp->pp"); s.op->newline() << "c->regs = regs;"; + + // Make it look like the IP is set as it wouldn't have been replaced + // by a breakpoint instruction when calling real probe handler. Reset + // IP regs on return, so we don't confuse kprobes. PR10458 + s.op->newline() << "{"; + s.op->indent(1); + s.op->newline() << "unsigned long kprobes_ip = REG_IP(c->regs);"; + s.op->newline() << "REG_IP(regs) = (unsigned long) inst->addr;"; s.op->newline() << "(*sdp->ph) (c);"; + s.op->newline() << "REG_IP(regs) = kprobes_ip;"; + s.op->newline(-1) << "}"; + common_probe_entryfn_epilogue (s.op); s.op->newline() << "return 0;"; s.op->newline(-1) << "}"; @@ -3009,7 +3020,18 @@ dwarf_derived_probe_group::emit_module_decls (systemtap_session& s) common_probe_entryfn_prologue (s.op, "STAP_SESSION_RUNNING", "sdp->pp"); s.op->newline() << "c->regs = regs;"; s.op->newline() << "c->pi = inst;"; // for assisting runtime's backtrace logic + + // Make it look like the IP is set as it wouldn't have been replaced + // by a breakpoint instruction when calling real probe handler. Reset + // IP regs on return, so we don't confuse kprobes. PR10458 + s.op->newline() << "{"; + s.op->indent(1); + s.op->newline() << "unsigned long kprobes_ip = REG_IP(c->regs);"; + s.op->newline() << "REG_IP(regs) = (unsigned long) inst->rp->kp.addr;"; s.op->newline() << "(*sdp->ph) (c);"; + s.op->newline() << "REG_IP(regs) = kprobes_ip;"; + s.op->newline(-1) << "}"; + common_probe_entryfn_epilogue (s.op); s.op->newline() << "return 0;"; s.op->newline(-1) << "}"; @@ -4381,7 +4403,18 @@ uprobe_derived_probe_group::emit_module_decls (systemtap_session& s) s.op->newline() << "if (sup->spec_index < 0 ||" << "sup->spec_index >= " << probes.size() << ") return;"; // XXX: should not happen s.op->newline() << "c->regs = regs;"; + + // Make it look like the IP is set as it would in the actual user + // task when calling real probe handler. Reset IP regs on return, so + // we don't confuse uprobes. PR10458 + s.op->newline() << "{"; + s.op->indent(1); + s.op->newline() << "unsigned long uprobes_ip = REG_IP(c->regs);"; + s.op->newline() << "REG_IP(regs) = inst->vaddr;"; s.op->newline() << "(*sups->ph) (c);"; + s.op->newline() << "REG_IP(regs) = uprobes_ip;"; + s.op->newline(-1) << "}"; + common_probe_entryfn_epilogue (s.op); s.op->newline(-1) << "}"; @@ -4393,7 +4426,18 @@ uprobe_derived_probe_group::emit_module_decls (systemtap_session& s) << "sup->spec_index >= " << probes.size() << ") return;"; // XXX: should not happen // XXX: kretprobes saves "c->pi = inst;" too s.op->newline() << "c->regs = regs;"; + + // Make it look like the IP is set as it would in the actual user + // task when calling real probe handler. Reset IP regs on return, so + // we don't confuse uprobes. PR10458 + s.op->newline() << "{"; + s.op->indent(1); + s.op->newline() << "unsigned long uprobes_ip = REG_IP(c->regs);"; + s.op->newline() << "REG_IP(regs) = inst->rp->u.vaddr;"; s.op->newline() << "(*sups->ph) (c);"; + s.op->newline() << "REG_IP(regs) = uprobes_ip;"; + s.op->newline(-1) << "}"; + common_probe_entryfn_epilogue (s.op); s.op->newline(-1) << "}"; @@ -4882,7 +4926,18 @@ kprobe_derived_probe_group::emit_module_decls (systemtap_session& s) s.op->line() << "];"; common_probe_entryfn_prologue (s.op, "STAP_SESSION_RUNNING", "sdp->pp"); s.op->newline() << "c->regs = regs;"; + + // Make it look like the IP is set as it wouldn't have been replaced + // by a breakpoint instruction when calling real probe handler. Reset + // IP regs on return, so we don't confuse kprobes. PR10458 + s.op->newline() << "{"; + s.op->indent(1); + s.op->newline() << "unsigned long kprobes_ip = REG_IP(c->regs);"; + s.op->newline() << "REG_IP(regs) = (unsigned long) inst->addr;"; s.op->newline() << "(*sdp->ph) (c);"; + s.op->newline() << "REG_IP(regs) = kprobes_ip;"; + s.op->newline(-1) << "}"; + common_probe_entryfn_epilogue (s.op); s.op->newline() << "return 0;"; s.op->newline(-1) << "}"; @@ -4905,7 +4960,18 @@ kprobe_derived_probe_group::emit_module_decls (systemtap_session& s) common_probe_entryfn_prologue (s.op, "STAP_SESSION_RUNNING", "sdp->pp"); s.op->newline() << "c->regs = regs;"; s.op->newline() << "c->pi = inst;"; // for assisting runtime's backtrace logic + + // Make it look like the IP is set as it wouldn't have been replaced + // by a breakpoint instruction when calling real probe handler. Reset + // IP regs on return, so we don't confuse kprobes. PR10458 + s.op->newline() << "{"; + s.op->indent(1); + s.op->newline() << "unsigned long kprobes_ip = REG_IP(c->regs);"; + s.op->newline() << "REG_IP(regs) = (unsigned long) inst->rp->kp.addr;"; s.op->newline() << "(*sdp->ph) (c);"; + s.op->newline() << "REG_IP(regs) = kprobes_ip;"; + s.op->newline(-1) << "}"; + common_probe_entryfn_epilogue (s.op); s.op->newline() << "return 0;"; s.op->newline(-1) << "}"; |