| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef __ASM_CRIS_ARCH_PROCESSOR_H |
| #define __ASM_CRIS_ARCH_PROCESSOR_H |
| |
| /* |
| * Default implementation of macro that returns current |
| * instruction pointer ("program counter"). |
| */ |
| #define current_text_addr() ({void *pc; __asm__ ("move.d $pc,%0" : "=rm" (pc)); pc; }) |
| |
| /* CRIS has no problems with write protection */ |
| #define wp_works_ok 1 |
| |
| /* CRIS thread_struct. this really has nothing to do with the processor itself, since |
| * CRIS does not do any hardware task-switching, but it's here for legacy reasons. |
| * The thread_struct here is used when task-switching using _resume defined in entry.S. |
| * The offsets here are hardcoded into _resume - if you change this struct, you need to |
| * change them as well!!! |
| */ |
| |
| struct thread_struct { |
| unsigned long ksp; /* kernel stack pointer */ |
| unsigned long usp; /* user stack pointer */ |
| unsigned long dccr; /* saved flag register */ |
| }; |
| |
| /* |
| * User space process size. This is hardcoded into a few places, |
| * so don't change it unless you know what you are doing. |
| */ |
| |
| #ifdef CONFIG_CRIS_LOW_MAP |
| #define TASK_SIZE (0x50000000UL) /* 1.25 GB */ |
| #else |
| #define TASK_SIZE (0xA0000000UL) /* 2.56 GB */ |
| #endif |
| |
| #define INIT_THREAD { \ |
| 0, 0, 0x20 } /* ccr = int enable, nothing else */ |
| |
| #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)->irp; \ |
| eip; \ |
| }) |
| |
| /* give the thread a program location |
| * set user-mode (The 'U' flag (User mode flag) is CCR/DCCR bit 8) |
| * switch user-stackpointer |
| */ |
| |
| #define start_thread(regs, ip, usp) do { \ |
| regs->irp = ip; \ |
| regs->dccr |= 1 << U_DCCR_BITNR; \ |
| wrusp(usp); \ |
| } while(0) |
| |
| /* Called when handling a kernel bus fault fixup. |
| * |
| * After a fixup we do not want to return by restoring the CPU-state |
| * anymore, so switch frame-types (see ptrace.h) |
| */ |
| #define arch_fixup(regs) \ |
| regs->frametype = CRIS_FRAME_NORMAL; |
| |
| #endif |
