samples: ftrace: Replace bti assembly with hint for older compiler

When cross-building the arm64 kernel with allmodconfig using GCC 9.4, the following error occurs on multiple files under samples/ftrace/: /tmp/ccPC1ODs.s: Assembler messages: /tmp/ccPC1ODs.s:8: Error: selected processor does not support `bti c' Fix this issue by replacing `bti c` with `hint 34`, which is compatible for the older compiler. Link: https://lore.kernel.org/linux-trace-kernel/[email protected] Cc: Masami Hiramatsu <[email protected]> Cc: Mark Rutland <[email protected]> Cc: Florent Revest <[email protected]> Fixes: 8c3526f ("arm64: ftrace: Add direct call trampoline samples support") Acked-by: Mark Rutland <[email protected]> Signed-off-by: GONG, Ruiqi <[email protected]> Signed-off-by: Steven Rostedt (Google) <[email protected]>
niw · Aug 22, 2023 · e332938 · e332938
1 parent c2489bb
commit e332938
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Showing 5 changed files with 7 additions and 7 deletions.
diff --git a/samples/ftrace/ftrace-direct-modify.c b/samples/ftrace/ftrace-direct-modify.c
@@ -105,7 +105,7 @@ asm (
 "	.type		my_tramp1, @function\n"
 "	.globl		my_tramp1\n"
 "   my_tramp1:"
-"	bti	c\n"
+"	hint	34\n" // bti	c
 "	sub	sp, sp, #16\n"
 "	stp	x9, x30, [sp]\n"
 "	bl	my_direct_func1\n"
@@ -117,7 +117,7 @@ asm (
 "	.type		my_tramp2, @function\n"
 "	.globl		my_tramp2\n"
 "   my_tramp2:"
-"	bti	c\n"
+"	hint	34\n" // bti	c
 "	sub	sp, sp, #16\n"
 "	stp	x9, x30, [sp]\n"
 "	bl	my_direct_func2\n"

diff --git a/samples/ftrace/ftrace-direct-multi-modify.c b/samples/ftrace/ftrace-direct-multi-modify.c
@@ -112,7 +112,7 @@ asm (
 "	.type		my_tramp1, @function\n"
 "	.globl		my_tramp1\n"
 "   my_tramp1:"
-"	bti	c\n"
+"	hint	34\n" // bti	c
 "	sub	sp, sp, #32\n"
 "	stp	x9, x30, [sp]\n"
 "	str	x0, [sp, #16]\n"
@@ -127,7 +127,7 @@ asm (
 "	.type		my_tramp2, @function\n"
 "	.globl		my_tramp2\n"
 "   my_tramp2:"
-"	bti	c\n"
+"	hint	34\n" // bti	c
 "	sub	sp, sp, #32\n"
 "	stp	x9, x30, [sp]\n"
 "	str	x0, [sp, #16]\n"

diff --git a/samples/ftrace/ftrace-direct-multi.c b/samples/ftrace/ftrace-direct-multi.c
@@ -75,7 +75,7 @@ asm (
 "	.type		my_tramp, @function\n"
 "	.globl		my_tramp\n"
 "   my_tramp:"
-"	bti	c\n"
+"	hint	34\n" // bti	c
 "	sub	sp, sp, #32\n"
 "	stp	x9, x30, [sp]\n"
 "	str	x0, [sp, #16]\n"

diff --git a/samples/ftrace/ftrace-direct-too.c b/samples/ftrace/ftrace-direct-too.c
@@ -81,7 +81,7 @@ asm (
 "	.type		my_tramp, @function\n"
 "	.globl		my_tramp\n"
 "   my_tramp:"
-"	bti	c\n"
+"	hint	34\n" // bti	c
 "	sub	sp, sp, #48\n"
 "	stp	x9, x30, [sp]\n"
 "	stp	x0, x1, [sp, #16]\n"

diff --git a/samples/ftrace/ftrace-direct.c b/samples/ftrace/ftrace-direct.c
@@ -72,7 +72,7 @@ asm (
 "	.type		my_tramp, @function\n"
 "	.globl		my_tramp\n"
 "   my_tramp:"
-"	bti	c\n"
+"	hint	34\n" // bti	c
 "	sub	sp, sp, #32\n"
 "	stp	x9, x30, [sp]\n"
 "	str	x0, [sp, #16]\n"