Fix: instruction pointer has different names across arch

Different terms are used to refer to the instruction pointer depending
on the CPU architecture.

For example:
x86 -> ip
powerpc	-> nip
RISC-V -> sepc
ARM -> ARM_pc
Microblaze -> pc

To fix this issue, we use the instruction_pointer() kernel function
(or macro depending on the arch) to get the right field in the pt_regs
struct for the current architecture.

Signed-off-by: Francis Deslauriers <francis.deslauriers@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

diff --git a/probes/lttng-uprobes.c b/probes/lttng-uprobes.c
index 47f3599f2baa336dd6c7e543a81aef5070b67efb..0b399291245f9f38d4ce1f52931311ebada3d73a 100644 (file)
--- a/probes/lttng-uprobes.c
+++ b/probes/lttng-uprobes.c
@@ -67,7 +67,7 @@ int lttng_uprobes_handler_pre(struct uprobe_consumer *uc, struct pt_regs *regs)
                return 0;
 
        /* Event payload. */
-       payload.ip = regs->ip;
+       payload.ip = (unsigned long)instruction_pointer(regs);
 
        lib_ring_buffer_align_ctx(&ctx, lttng_alignof(payload));
        chan->ops->event_write(&ctx, &payload, sizeof(payload));