[PATCH v4 13/15] objtool: Prepare noreturns.h for more architectures

From: Christophe Leroy
Date: Tue Jul 11 2023 - 12:09:07 EST


noreturns.h is a mix of x86 specific functions and more generic
core functions.

In preparation of inclusion of powerpc, split x86 functions out of
noreturns.h into arch/noreturns.h

Signed-off-by: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
---
.../objtool/arch/x86/include/arch/noreturns.h | 20 +++++++++++++++++++
tools/objtool/noreturns.h | 14 ++-----------
2 files changed, 22 insertions(+), 12 deletions(-)
create mode 100644 tools/objtool/arch/x86/include/arch/noreturns.h

diff --git a/tools/objtool/arch/x86/include/arch/noreturns.h b/tools/objtool/arch/x86/include/arch/noreturns.h
new file mode 100644
index 000000000000..a4262aff3917
--- /dev/null
+++ b/tools/objtool/arch/x86/include/arch/noreturns.h
@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+/*
+ * This is a (sorted!) list of all known __noreturn functions in arch/x86.
+ * It's needed for objtool to properly reverse-engineer the control flow graph.
+ *
+ * Yes, this is unfortunate. A better solution is in the works.
+ */
+NORETURN(cpu_bringup_and_idle)
+NORETURN(ex_handler_msr_mce)
+NORETURN(hlt_play_dead)
+NORETURN(hv_ghcb_terminate)
+NORETURN(machine_real_restart)
+NORETURN(rewind_stack_and_make_dead)
+NORETURN(sev_es_terminate)
+NORETURN(snp_abort)
+NORETURN(x86_64_start_kernel)
+NORETURN(x86_64_start_reservations)
+NORETURN(xen_cpu_bringup_again)
+NORETURN(xen_start_kernel)
diff --git a/tools/objtool/noreturns.h b/tools/objtool/noreturns.h
index e45c7cb1d5bc..b5e0f078dbb6 100644
--- a/tools/objtool/noreturns.h
+++ b/tools/objtool/noreturns.h
@@ -1,5 +1,7 @@
/* SPDX-License-Identifier: GPL-2.0 */

+#include <arch/noreturns.h>
+
/*
* This is a (sorted!) list of all known __noreturn functions in the kernel.
* It's needed for objtool to properly reverse-engineer the control flow graph.
@@ -14,32 +16,20 @@ NORETURN(__stack_chk_fail)
NORETURN(__ubsan_handle_builtin_unreachable)
NORETURN(arch_call_rest_init)
NORETURN(arch_cpu_idle_dead)
-NORETURN(cpu_bringup_and_idle)
NORETURN(cpu_startup_entry)
NORETURN(do_exit)
NORETURN(do_group_exit)
NORETURN(do_task_dead)
-NORETURN(ex_handler_msr_mce)
NORETURN(fortify_panic)
-NORETURN(hlt_play_dead)
-NORETURN(hv_ghcb_terminate)
NORETURN(kthread_complete_and_exit)
NORETURN(kthread_exit)
NORETURN(kunit_try_catch_throw)
-NORETURN(machine_real_restart)
NORETURN(make_task_dead)
NORETURN(mpt_halt_firmware)
NORETURN(nmi_panic_self_stop)
NORETURN(panic)
NORETURN(panic_smp_self_stop)
NORETURN(rest_init)
-NORETURN(rewind_stack_and_make_dead)
-NORETURN(sev_es_terminate)
-NORETURN(snp_abort)
NORETURN(start_kernel)
NORETURN(stop_this_cpu)
NORETURN(usercopy_abort)
-NORETURN(x86_64_start_kernel)
-NORETURN(x86_64_start_reservations)
-NORETURN(xen_cpu_bringup_again)
-NORETURN(xen_start_kernel)
--
2.41.0