The DW_CFA_GNU_args_size DWARF CFI instruction is used by GCC to track
the size of arguments pushed on the stack for exception handling
purposes. It is not needed for stack tracing.
Signed-off-by: Jens Remus <redacted>
---
Notes (jremus):
This patch could be squashed into "unwind_user/eh_frame: Add support for
reading .eh_frame section". Leaving separate for review.
kernel/unwind/eh_frame.c | 11 +++++++++++
kernel/unwind/eh_frame.h | 1 +
2 files changed, 12 insertions(+)
diff --git a/kernel/unwind/eh_frame.c b/kernel/unwind/eh_frame.c
index 1ac7308814a1..d185187b0c34 100644
--- a/kernel/unwind/eh_frame.c
+++ b/kernel/unwind/eh_frame.c
@@ -980,6 +980,17 @@ static __always_inline int __do_cfi_insn(struct eh_frame_section *sec,
break;
}
+ case DW_CFA_GNU_args_size: {
+ unsigned long args_size;
+
+ ret = read_uleb128(&cur, end, &args_size);
+ if (ret)
+ return ret;
+
+ /* Ignore DW_CFA_GNU_args_size */
+ break;
+ }
+
case DW_CFA_remember_state:
if (ctx->stack_depth >= EH_FRAME_MAX_STATE_STACK)
return -EINVAL;diff --git a/kernel/unwind/eh_frame.h b/kernel/unwind/eh_frame.h
index 9a0c71102742..a43560486283 100644
--- a/kernel/unwind/eh_frame.h
+++ b/kernel/unwind/eh_frame.h
@@ -29,6 +29,7 @@
#define DW_CFA_val_offset 0x14
#define DW_CFA_val_offset_sf 0x15
#define DW_CFA_val_expression 0x16
+#define DW_CFA_GNU_args_size 0x2e
/* Helpers for CFI opcodes */
#define DW_CFA_opcode(insn) ((insn) & 0xc0)
--
2.53.0