Change in coreboot[master]: arch/riscv/mcall.h: Fix building with clang

[Arthur Heymans (Code Review)]

Attention is currently required from: Philipp Hug, Arthur Heymans, ron minnich.
Hello Arthur Heymans,

I'd like you to do a code review. Please visit

https://review.coreboot.org/c/coreboot/+/63072

to review the following change.

Change subject: arch/riscv/mcall.h: Fix building with clang
......................................................................

arch/riscv/mcall.h: Fix building with clang

Having multiple statements hidden inside a macro that supposedly
returns a pointer does not work well with clang. Moving the stack
register to a global variable fixes this.

Change-Id: If24b2766404b892a006926f0cd45771ceebf1275
Signed-off-by: Arthur Heymans 
---
M src/arch/riscv/include/mcall.h
1 file changed, 3 insertions(+), 2 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/72/63072/1

diff --git a/src/arch/riscv/include/mcall.h b/src/arch/riscv/include/mcall.h
index 803ee3e..12483ca 100644
--- a/src/arch/riscv/include/mcall.h
+++ b/src/arch/riscv/include/mcall.h
@@ -54,9 +54,10 @@
    sizeof(hls_t) == HLS_SIZE,
    "HLS_SIZE must equal to sizeof(hls_t)");

-#define MACHINE_STACK_TOP() ({ \
+register uintptr_t sp asm("sp");
+
+#define MACHINE_STACK_TOP() ({		   \
    /* coverity[uninit_use] : FALSE */ \
-	register uintptr_t sp asm ("sp"); \
    (void*)((sp + RISCV_PGSIZE) & -RISCV_PGSIZE); })

// hart-local storage, at top of stack