[tip: objtool/urgent] objtool: Ignore end-of-section jumps for KCOV/GCOV

[tip-bot2 for Josh Poimboeuf]

The following commit has been merged into the objtool/urgent branch of tip:

Commit-ID:     0d7597749f5a3ac67851d3836635d084df15fb66
Gitweb:        https://git.kernel.org/tip/0d7597749f5a3ac67851d3836635d084df15fb66
Author:        Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
AuthorDate:    Mon, 31 Mar 2025 21:26:37 -07:00
Committer:     Ingo Molnar <mingo@xxxxxxxxxx>
CommitterDate: Tue, 01 Apr 2025 09:07:12 +02:00

objtool: Ignore end-of-section jumps for KCOV/GCOV

When KCOV or GCOV is enabled, dead code can be left behind, in which
case objtool silences unreachable and undefined behavior (fallthrough)
warnings.

Fallthrough warnings, and their variant "end of section" warnings, were
silenced with the following commit:

  6b023c784204 ("objtool: Silence more KCOV warnings")

Another variant of a fallthrough warning is a jump to the end of a
function.  If that function happens to be at the end of a section, the
jump destination doesn't actually exist.

Normally that would be a fatal objtool error, but for KCOV/GCOV it's
just another undefined behavior fallthrough.  Silence it like the
others.

Fixes the following warning:

  drivers/iommu/dma-iommu.o: warning: objtool: iommu_dma_sw_msi+0x92: can't find jump dest instruction at .text+0x54d5

Fixes: 6b023c784204 ("objtool: Silence more KCOV warnings")
Reported-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/08fbe7d7e1e20612206f1df253077b94f178d93e.1743481539.git.jpoimboe@xxxxxxxxxx
Closes: https://lore.kernel.org/314f8809-cd59-479b-97d7-49356bf1c8d1@xxxxxxxxxxxxx/
---
 tools/objtool/check.c | 22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index fff9d7a..e6c4eef 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -1488,6 +1488,8 @@ static int add_jump_destinations(struct objtool_file *file)
 	int ret;
 
 	for_each_insn(file, insn) {
+		struct symbol *func = insn_func(insn);
+
 		if (insn->jump_dest) {
 			/*
 			 * handle_group_alt() may have previously set
@@ -1513,7 +1515,7 @@ static int add_jump_destinations(struct objtool_file *file)
 		} else if (reloc->sym->return_thunk) {
 			add_return_call(file, insn, true);
 			continue;
-		} else if (insn_func(insn)) {
+		} else if (func) {
 			/*
 			 * External sibling call or internal sibling call with
 			 * STT_FUNC reloc.
@@ -1548,6 +1550,15 @@ static int add_jump_destinations(struct objtool_file *file)
 				continue;
 			}
 
+			/*
+			 * GCOV/KCOV dead code can jump to the end of the
+			 * function/section.
+			 */
+			if (file->ignore_unreachables && func &&
+			    dest_sec == insn->sec &&
+			    dest_off == func->offset + func->len)
+				continue;
+
 			WARN_INSN(insn, "can't find jump dest instruction at %s+0x%lx",
 				  dest_sec->name, dest_off);
 			return -1;
@@ -1574,8 +1585,7 @@ static int add_jump_destinations(struct objtool_file *file)
 		/*
 		 * Cross-function jump.
 		 */
-		if (insn_func(insn) && insn_func(jump_dest) &&
-		    insn_func(insn) != insn_func(jump_dest)) {
+		if (func && insn_func(jump_dest) && func != insn_func(jump_dest)) {
 
 			/*
 			 * For GCC 8+, create parent/child links for any cold
@@ -1592,10 +1602,10 @@ static int add_jump_destinations(struct objtool_file *file)
 			 * case where the parent function's only reference to a
 			 * subfunction is through a jump table.
 			 */
-			if (!strstr(insn_func(insn)->name, ".cold") &&
+			if (!strstr(func->name, ".cold") &&
 			    strstr(insn_func(jump_dest)->name, ".cold")) {
-				insn_func(insn)->cfunc = insn_func(jump_dest);
-				insn_func(jump_dest)->pfunc = insn_func(insn);
+				func->cfunc = insn_func(jump_dest);
+				insn_func(jump_dest)->pfunc = func;
 			}
 		}