diff options
| author |   Oleg Nesterov <oleg@redhat.com> | 2012-12-30 15:54:08 +0100 |
|---|---|---|
| committer | Oleg Nesterov <oleg@redhat.com> | 2013-02-08 17:47:11 +0100 |
| commit | 74e59dfc6b19e3472a7c16ad57bc831e6e647895 (patch) | |
| tree | 5047f177b6c604f83d4b9f62614acf93a08d34bd /kernel | |
| parent | uprobes/x86: Change __skip_sstep() to actually skip the whole insn (diff) | |
| download | linux-dev-74e59dfc6b19e3472a7c16ad57bc831e6e647895.tar.xz linux-dev-74e59dfc6b19e3472a7c16ad57bc831e6e647895.zip | |
uprobes: Change handle_swbp() to expose bp_vaddr to handler_chain()
Change handle_swbp() to set regs->ip = bp_vaddr in advance, this is
what consumer->handler() needs but uprobe_get_swbp_addr() is not
exported.
This also simplifies the code and makes it more consistent across
the supported architectures. handle_swbp() becomes the only caller
of uprobe_get_swbp_addr().
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/events/uprobes.c | 15 | ||||
| -rw-r--r-- | kernel/trace/trace_uprobe.c | 4 |
2 files changed, 9 insertions, 10 deletions
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index 04c104ad9522..f1b807831fc2 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -1504,6 +1504,10 @@ static void handle_swbp(struct pt_regs *regs) } return; } + + /* change it in advance for ->handler() and restart */ + instruction_pointer_set(regs, bp_vaddr); + /* * TODO: move copy_insn/etc into _register and remove this hack. * After we hit the bp, _unregister + _register can install the @@ -1511,14 +1515,14 @@ static void handle_swbp(struct pt_regs *regs) */ smp_rmb(); /* pairs with wmb() in install_breakpoint() */ if (unlikely(!test_bit(UPROBE_COPY_INSN, &uprobe->flags))) - goto restart; + goto out; utask = current->utask; if (!utask) { utask = add_utask(); /* Cannot allocate; re-execute the instruction. */ if (!utask) - goto restart; + goto out; } handler_chain(uprobe, regs); @@ -1531,12 +1535,7 @@ static void handle_swbp(struct pt_regs *regs) return; } -restart: - /* - * cannot singlestep; cannot skip instruction; - * re-execute the instruction. - */ - instruction_pointer_set(regs, bp_vaddr); + /* can_skip_sstep() succeeded, or restart if can't singlestep */ out: put_uprobe(uprobe); } diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c index e668024773d4..17d9b2bcc28d 100644 --- a/kernel/trace/trace_uprobe.c +++ b/kernel/trace/trace_uprobe.c @@ -492,7 +492,7 @@ static void uprobe_trace_func(struct trace_uprobe *tu, struct pt_regs *regs) return; entry = ring_buffer_event_data(event); - entry->ip = uprobe_get_swbp_addr(task_pt_regs(current)); + entry->ip = instruction_pointer(task_pt_regs(current)); data = (u8 *)&entry[1]; for (i = 0; i < tu->nr_args; i++) call_fetch(&tu->args[i].fetch, regs, data + tu->args[i].offset); @@ -667,7 +667,7 @@ static void uprobe_perf_func(struct trace_uprobe *tu, struct pt_regs *regs) if (!entry) goto out; - entry->ip = uprobe_get_swbp_addr(task_pt_regs(current)); + entry->ip = instruction_pointer(task_pt_regs(current)); data = (u8 *)&entry[1]; for (i = 0; i < tu->nr_args; i++) call_fetch(&tu->args[i].fetch, regs, data + tu->args[i].offset); |