blob: e23df8dc96e8c7d80633e0165e6757ffd2467583 (
plain) (
tree)
|
|
#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)user_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 { \
set_fs(USER_DS); \
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
|
