[PATCH v2 nolibc 24/53] tools/nolibc: riscv: add stackprotector support

Paul E. McKenney
2023-06-12T20:51:27Z

Acked-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
---
tools/include/nolibc/arch-riscv.h | 7 ++++++-
tools/testing/selftests/nolibc/Makefile | 1 +
2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/tools/include/nolibc/arch-riscv.h b/tools/include/nolibc/arch-riscv.h
index 992a1739dd9c..d0439249c9c9 100644
--- a/tools/include/nolibc/arch-riscv.h
+++ b/tools/include/nolibc/arch-riscv.h
@@ -177,14 +177,19 @@ struct sys_stat_struct {
char **environ __attribute__((weak));
const unsigned long *_auxv __attribute__((weak));

+#define __ARCH_SUPPORTS_STACK_PROTECTOR
+
/* startup code */
-void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) _start(void)
+void __attribute__((weak,noreturn,optimize("omit-frame-pointer"),no_stack_protector)) _start(void)
{
__asm__ volatile (
".option push\n"
".option norelax\n"
"lla gp, __global_pointer$\n"
".option pop\n"
+#ifdef NOLIBC_STACKPROTECTOR
+ "call __stack_chk_init\n" /* initialize stack protector */
+#endif
REG_L" a0, 0(sp)\n" /* argc (a0) was in the stack */
"add a1, sp, "SZREG"\n" /* argv (a1) = sp */
"slli a2, a0, "PTRLOG"\n" /* envp (a2) = SZREG*argc ... */
diff --git a/tools/testing/selftests/nolibc/Makefile b/tools/testing/selftests/nolibc/Makefile
index 6d660d922240..bd41102ea299 100644
--- a/tools/testing/selftests/nolibc/Makefile
+++ b/tools/testing/selftests/nolibc/Makefile
@@ -85,6 +85,7 @@ CFLAGS_STKP_x86 = $(CFLAGS_STACKPROTECTOR)
CFLAGS_STKP_arm64 = $(CFLAGS_STACKPROTECTOR)
CFLAGS_STKP_arm = $(CFLAGS_STACKPROTECTOR)
CFLAGS_STKP_mips = $(CFLAGS_STACKPROTECTOR)
+CFLAGS_STKP_riscv = $(CFLAGS_STACKPROTECTOR)
CFLAGS_STKP_loongarch = $(CFLAGS_STACKPROTECTOR)
CFLAGS_s390 = -m64
CFLAGS ?= -Os -fno-ident -fno-asynchronous-unwind-tables -std=c89 \
--
2.40.1