On 11/14/17 7:34 AM, Oleg Nesterov wrote:
On 11/13, Yonghong Song wrote:
On 11/13/17 4:59 AM, Oleg Nesterov wrote:
+ switch (opc1) {
+ case 0x50:
+ reg_offset = offsetof(struct pt_regs, r8);
+ break;
+
On 11/13, Yonghong Song wrote:
>
> On 11/13/17 4:59 AM, Oleg Nesterov wrote:
> >>+ switch (opc1) {
> >>+ case 0x50:
> >>+ reg_offset = offsetof(struct pt_regs, r8);
> >>+ break;
> >>+ case 0x51:
> >>+ reg_offset =
On 11/13/17 4:59 AM, Oleg Nesterov wrote:
The patch looks good to me, but I have a question because I know nothing
about insn encoding,
On 11/10, Yonghong Song wrote:
+static int push_setup_xol_ops(struct arch_uprobe *auprobe, struct insn *insn)
+{
+ u8 opc1 = OPCODE1(insn),
The patch looks good to me, but I have a question because I know nothing
about insn encoding,
On 11/10, Yonghong Song wrote:
>
> +static int push_setup_xol_ops(struct arch_uprobe *auprobe, struct insn *insn)
> +{
> + u8 opc1 = OPCODE1(insn), reg_offset = 0;
> +
> + if (opc1 < 0x50 || opc1
Uprobe is a tracing mechanism for userspace programs.
Typical uprobe will incur overhead of two traps.
First trap is caused by replaced trap insn, and
the second trap is to execute the original displaced
insn in user space.
To reduce the overhead, kernel provides hooks
for architectures to
