path: root/kernel/events
diff options
authorAnanth N Mavinakayanahalli <ananth@in.ibm.com>2013-03-22 20:46:27 +0530
committerOleg Nesterov <oleg@redhat.com>2013-04-04 13:57:04 +0200
commit0908ad6e56b5a6e86745680bc324bdbfac64d0b6 (patch)
treedc403ef4b7ee5b912e7c097b2b8bb2e5260bc8ed /kernel/events
parentf281769e81b49840f1857f6dfac049350e678350 (diff)
uprobes: Add trap variant helper
Some architectures like powerpc have multiple variants of the trap instruction. Introduce an additional helper is_trap_insn() for run-time handling of non-uprobe traps on such architectures. While there, change is_swbp_at_addr() to is_trap_at_addr() for reading clarity. With this change, the uprobe registration path will supercede any trap instruction inserted at the requested location, while taking care of delivering the SIGTRAP for cases where the trap notification came in for an address without a uprobe. See [1] for a more detailed explanation. [1] https://lists.ozlabs.org/pipermail/linuxppc-dev/2013-March/104771.html This change was suggested by Oleg Nesterov. Signed-off-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Diffstat (limited to 'kernel/events')
1 files changed, 29 insertions, 5 deletions
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 26bc2e24e9e..ca9012930ce 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -173,6 +173,20 @@ bool __weak is_swbp_insn(uprobe_opcode_t *insn)
return *insn == UPROBE_SWBP_INSN;
+ * is_trap_insn - check if instruction is breakpoint instruction.
+ * @insn: instruction to be checked.
+ * Default implementation of is_trap_insn
+ * Returns true if @insn is a breakpoint instruction.
+ *
+ * This function is needed for the case where an architecture has multiple
+ * trap instructions (like powerpc).
+ */
+bool __weak is_trap_insn(uprobe_opcode_t *insn)
+ return is_swbp_insn(insn);
static void copy_opcode(struct page *page, unsigned long vaddr, uprobe_opcode_t *opcode)
void *kaddr = kmap_atomic(page);
@@ -185,6 +199,15 @@ static int verify_opcode(struct page *page, unsigned long vaddr, uprobe_opcode_t
uprobe_opcode_t old_opcode;
bool is_swbp;
+ /*
+ * Note: We only check if the old_opcode is UPROBE_SWBP_INSN here.
+ * We do not check if it is any other 'trap variant' which could
+ * be conditional trap instruction such as the one powerpc supports.
+ *
+ * The logic is that we do not care if the underlying instruction
+ * is a trap variant; uprobes always wins over any other (gdb)
+ * breakpoint.
+ */
copy_opcode(page, vaddr, &old_opcode);
is_swbp = is_swbp_insn(&old_opcode);
@@ -204,7 +227,7 @@ static int verify_opcode(struct page *page, unsigned long vaddr, uprobe_opcode_t
* Expect the breakpoint instruction to be the smallest size instruction for
* the architecture. If an arch has variable length instruction and the
* breakpoint instruction is not of the smallest length instruction
- * supported by that architecture then we need to modify is_swbp_at_addr and
+ * supported by that architecture then we need to modify is_trap_at_addr and
* write_opcode accordingly. This would never be a problem for archs that
* have fixed length instructions.
@@ -550,7 +573,7 @@ static int prepare_uprobe(struct uprobe *uprobe, struct file *file,
goto out;
ret = -ENOTSUPP;
- if (is_swbp_insn((uprobe_opcode_t *)uprobe->arch.insn))
+ if (is_trap_insn((uprobe_opcode_t *)uprobe->arch.insn))
goto out;
ret = arch_uprobe_analyze_insn(&uprobe->arch, mm, vaddr);
@@ -1431,7 +1454,7 @@ static void mmf_recalc_uprobes(struct mm_struct *mm)
clear_bit(MMF_HAS_UPROBES, &mm->flags);
-static int is_swbp_at_addr(struct mm_struct *mm, unsigned long vaddr)
+static int is_trap_at_addr(struct mm_struct *mm, unsigned long vaddr)
struct page *page;
uprobe_opcode_t opcode;
@@ -1452,7 +1475,8 @@ static int is_swbp_at_addr(struct mm_struct *mm, unsigned long vaddr)
copy_opcode(page, vaddr, &opcode);
- return is_swbp_insn(&opcode);
+ /* This needs to return true for any variant of the trap insn */
+ return is_trap_insn(&opcode);
static struct uprobe *find_active_uprobe(unsigned long bp_vaddr, int *is_swbp)
@@ -1472,7 +1496,7 @@ static struct uprobe *find_active_uprobe(unsigned long bp_vaddr, int *is_swbp)
if (!uprobe)
- *is_swbp = is_swbp_at_addr(mm, bp_vaddr);
+ *is_swbp = is_trap_at_addr(mm, bp_vaddr);
} else {
*is_swbp = -EFAULT;