diff options
Diffstat (limited to 'kernel/riscv.h')
-rw-r--r-- | kernel/riscv.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/kernel/riscv.h b/kernel/riscv.h index 33fa9ee..5ede50a 100644 --- a/kernel/riscv.h +++ b/kernel/riscv.h @@ -327,6 +327,15 @@ sfence_vma() asm volatile("sfence.vma zero, zero"); } +// read the frame pointer of currently executing func +static inline uint64 +r_fp() +{ + uint64 x; + asm volatile("mv %0, s0" : "=r" (x) ); + return x; +} + typedef uint64 pte_t; typedef uint64 *pagetable_t; // 512 PTEs |