[PATCH] arm: smh: Fix uninitialized parameters with newer GCCs

[Sean Anderson]

Newer versions of GCC won't initialize parts of structures which don't
appear to be used. This results in uninitialized semihosting parameters
passed via R1. Fix this by marking the inline assembly as clobbering
memory.

Signed-off-by: Sean Anderson <sean.anderson at seco.com>
---

 arch/arm/lib/semihosting.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/arm/lib/semihosting.c b/arch/arm/lib/semihosting.c
index dbea2b06fb2..01d652a6b83 100644
--- a/arch/arm/lib/semihosting.c
+++ b/arch/arm/lib/semihosting.c
@@ -32,12 +32,12 @@ static noinline long smh_trap(unsigned int sysnum, void *addr)
 {
 	register long result asm("r0");
 #if defined(CONFIG_ARM64)
-	asm volatile ("hlt #0xf000" : "=r" (result) : "0"(sysnum), "r"(addr));
+	asm volatile ("hlt #0xf000" : "=r" (result) : "0"(sysnum), "r"(addr) : "memory");
 #elif defined(CONFIG_CPU_V7M)
-	asm volatile ("bkpt #0xAB" : "=r" (result) : "0"(sysnum), "r"(addr));
+	asm volatile ("bkpt #0xAB" : "=r" (result) : "0"(sysnum), "r"(addr) : "memory");
 #else
 	/* Note - untested placeholder */
-	asm volatile ("svc #0x123456" : "=r" (result) : "0"(sysnum), "r"(addr));
+	asm volatile ("svc #0x123456" : "=r" (result) : "0"(sysnum), "r"(addr) : "memory");
 #endif
 	return result;
 }
-- 
2.35.1.1320.gc452695387.dirty