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@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; }