Changeset 128359eb in mainline for kernel/arch/riscv64/include/arch/asm.h

Timestamp:

2020-06-12T16:46:32Z (5 years ago)

Author:

Martin Decky <martin@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

ffccdff0

Parents:

94e75cf

Message:

Replace get_stack_base() with builtin_frame_address(0)

The usage of an intrinsic function to obtain the current stack pointer
should provide the compuler more room for performance optimizations than
the hand-written (and volatile) inline assembly block.

File:

• kernel/arch/riscv64/include/arch/asm.h (modified) (1 diff)

kernel/arch/riscv64/include/arch/asm.h

@@ -91 +91 @@
 }
 
-_NO_TRACE static inline uintptr_t get_stack_base(void)
-{
-        uintptr_t base;
-
-        asm volatile (
-            "and %[base], sp, %[mask]\n"
-            : [base] "=r" (base)
-            : [mask] "r" (~(STACK_SIZE - 1))
-        );
-
-        return base;
-}
-
 _NO_TRACE static inline void cpu_sleep(void)
 {