| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef _ASM_CRIS_ARCH_PROCESSOR_H |
| #define _ASM_CRIS_ARCH_PROCESSOR_H |
| |
| |
| /* Return current instruction pointer. */ |
| #define current_text_addr() \ |
| ({void *pc; __asm__ __volatile__ ("lapcq .,%0" : "=rm" (pc)); pc;}) |
| |
| /* |
| * Since CRIS doesn't do hardware task-switching this hasn't really anything to |
| * do with the proccessor itself, it's just here for legacy reasons. This is |
| * used when task-switching using _resume defined in entry.S. The offsets here |
| * are hardcoded into _resume, so if this struct is changed, entry.S needs to be |
| * changed as well. |
| */ |
| struct thread_struct { |
| unsigned long ksp; /* Kernel stack pointer. */ |
| unsigned long usp; /* User stack pointer. */ |
| unsigned long ccs; /* Saved flags register. */ |
| }; |
| |
| /* |
| * User-space process size. This is hardcoded into a few places, so don't |
| * change it unless everything's clear! |
| */ |
| #define TASK_SIZE (0xB0000000UL) |
| |
| #define INIT_THREAD { } |
| |
| #define KSTK_EIP(tsk) \ |
| ({ \ |
| unsigned long eip = 0; \ |
| unsigned long regs = (unsigned long)task_pt_regs(tsk); \ |
| if (regs > PAGE_SIZE && virt_addr_valid(regs)) \ |
| eip = ((struct pt_regs *)regs)->erp; \ |
| eip; \ |
| }) |
| |
| /* |
| * Give the thread a program location, set user-mode and switch user |
| * stackpointer. |
| */ |
| #define start_thread(regs, ip, usp) \ |
| do { \ |
| regs->erp = ip; \ |
| regs->ccs |= 1 << (U_CCS_BITNR + CCS_SHIFT); \ |
| wrusp(usp); \ |
| } while(0) |
| |
| /* Nothing special to do for v32 when handling a kernel bus fault fixup. */ |
| #define arch_fixup(regs) {}; |
| |
| #endif /* _ASM_CRIS_ARCH_PROCESSOR_H */ |
