diff options
Diffstat (limited to 'arch/riscv/mm/fault.c')
| -rw-r--r-- | arch/riscv/mm/fault.c | 48 |
1 files changed, 27 insertions, 21 deletions
diff --git a/arch/riscv/mm/fault.c b/arch/riscv/mm/fault.c index bdc70d3d507f..a23eaf5ce95c 100644 --- a/arch/riscv/mm/fault.c +++ b/arch/riscv/mm/fault.c @@ -156,6 +156,30 @@ static void inline vmalloc_fault(struct pt_regs *regs, int code, unsigned long a local_flush_tlb_page(addr); } +static inline bool access_error(unsigned long cause, struct vm_area_struct *vma) +{ + switch (cause) { + case EXC_INST_PAGE_FAULT: + if (!(vma->vm_flags & VM_EXEC)) { + return true; + } + break; + case EXC_LOAD_PAGE_FAULT: + if (!(vma->vm_flags & VM_READ)) { + return true; + } + break; + case EXC_STORE_PAGE_FAULT: + if (!(vma->vm_flags & VM_WRITE)) { + return true; + } + break; + default: + panic("%s: unhandled cause %lu", __func__, cause); + } + return false; +} + /* * This routine handles page faults. It determines the address and the * problem, and then passes it off to one of the appropriate routines. @@ -236,27 +260,9 @@ retry: good_area: code = SEGV_ACCERR; - switch (cause) { - case EXC_INST_PAGE_FAULT: - if (!(vma->vm_flags & VM_EXEC)) { - bad_area(regs, mm, code, addr); - return; - } - break; - case EXC_LOAD_PAGE_FAULT: - if (!(vma->vm_flags & VM_READ)) { - bad_area(regs, mm, code, addr); - return; - } - break; - case EXC_STORE_PAGE_FAULT: - if (!(vma->vm_flags & VM_WRITE)) { - bad_area(regs, mm, code, addr); - return; - } - break; - default: - panic("%s: unhandled cause %lu", __func__, cause); + if (unlikely(access_error(cause, vma))) { + bad_area(regs, mm, code, addr); + return; } /* |