d5adb029ef
Previously, init failed to do anything meaningful;
it turns out that the reason is that FD-PIC has a readonly data
section which can be located in the XIP filesystem, and various address checks
in the kernel reject such addresses for syscall arguments. Hence, init's
execve ("/bin/sh", ...)
failed with error code EFAULT.
There's room for improvement here: in case people want to have filesystems
on flash rather than in main memory, _access_ok should be modified to
allow this.
This bug fix is also dedicated to Michael Hennerich.
Signed-off-by: Bernd Schmidt <bernds_cb1@t-online.de>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
140 lines
3.3 KiB
C
140 lines
3.3 KiB
C
#ifndef __ASM_BFIN_PROCESSOR_H
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#define __ASM_BFIN_PROCESSOR_H
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/*
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* Default implementation of macro that returns current
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* instruction pointer ("program counter").
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*/
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#define current_text_addr() ({ __label__ _l; _l: &&_l;})
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#include <asm/blackfin.h>
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#include <asm/segment.h>
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#include <linux/compiler.h>
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static inline unsigned long rdusp(void)
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{
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unsigned long usp;
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__asm__ __volatile__("%0 = usp;\n\t":"=da"(usp));
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return usp;
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}
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static inline void wrusp(unsigned long usp)
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{
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__asm__ __volatile__("usp = %0;\n\t"::"da"(usp));
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}
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/*
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* User space process size: 1st byte beyond user address space.
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* Fairly meaningless on nommu. Parts of user programs can be scattered
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* in a lot of places, so just disable this by setting it to 0xFFFFFFFF.
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*/
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#define TASK_SIZE 0xFFFFFFFF
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#ifdef __KERNEL__
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#define STACK_TOP TASK_SIZE
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#endif
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#define TASK_UNMAPPED_BASE 0
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struct thread_struct {
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unsigned long ksp; /* kernel stack pointer */
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unsigned long usp; /* user stack pointer */
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unsigned short seqstat; /* saved status register */
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unsigned long esp0; /* points to SR of stack frame pt_regs */
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unsigned long pc; /* instruction pointer */
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void * debuggerinfo;
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};
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#define INIT_THREAD { \
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sizeof(init_stack) + (unsigned long) init_stack, 0, \
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PS_S, 0, 0 \
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}
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/*
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* Do necessary setup to start up a newly executed thread.
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*
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* pass the data segment into user programs if it exists,
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* it can't hurt anything as far as I can tell
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*/
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#define start_thread(_regs, _pc, _usp) \
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do { \
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set_fs(USER_DS); \
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(_regs)->pc = (_pc); \
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if (current->mm) \
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(_regs)->p5 = current->mm->start_data; \
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task_thread_info(current)->l1_task_info.stack_start \
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= (void *)current->mm->context.stack_start; \
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task_thread_info(current)->l1_task_info.lowest_sp = (void *)(_usp); \
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memcpy(L1_SCRATCH_TASK_INFO, &task_thread_info(current)->l1_task_info, \
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sizeof(*L1_SCRATCH_TASK_INFO)); \
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wrusp(_usp); \
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} while(0)
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/* Forward declaration, a strange C thing */
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struct task_struct;
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/* Free all resources held by a thread. */
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static inline void release_thread(struct task_struct *dead_task)
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{
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}
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#define prepare_to_copy(tsk) do { } while (0)
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extern int kernel_thread(int (*fn) (void *), void *arg, unsigned long flags);
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/*
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* Free current thread data structures etc..
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*/
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static inline void exit_thread(void)
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{
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}
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/*
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* Return saved PC of a blocked thread.
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*/
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#define thread_saved_pc(tsk) (tsk->thread.pc)
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unsigned long get_wchan(struct task_struct *p);
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#define KSTK_EIP(tsk) \
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({ \
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unsigned long eip = 0; \
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if ((tsk)->thread.esp0 > PAGE_SIZE && \
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MAP_NR((tsk)->thread.esp0) < max_mapnr) \
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eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \
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eip; })
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#define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp)
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#define cpu_relax() barrier()
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/* Get the Silicon Revision of the chip */
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static inline uint32_t __pure bfin_revid(void)
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{
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/* stored in the upper 4 bits */
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return bfin_read_CHIPID() >> 28;
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}
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static inline uint32_t __pure bfin_compiled_revid(void)
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{
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#if defined(CONFIG_BF_REV_0_0)
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return 0;
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#elif defined(CONFIG_BF_REV_0_1)
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return 1;
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#elif defined(CONFIG_BF_REV_0_2)
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return 2;
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#elif defined(CONFIG_BF_REV_0_3)
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return 3;
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#elif defined(CONFIG_BF_REV_0_4)
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return 4;
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#elif defined(CONFIG_BF_REV_0_5)
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return 5;
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#elif defined(CONFIG_BF_REV_ANY)
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return 0xffff;
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#else
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return -1;
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#endif
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}
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#endif
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