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/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2001 - 2008 Tensilica Inc.
 * Copyright (C) 2015 Cadence Design Systems Inc.
 */

#ifndef _XTENSA_PROCESSOR_H
#define _XTENSA_PROCESSOR_H

#include <variant/core.h>
#include <platform/hardware.h>

#include <linux/compiler.h>
#include <asm/ptrace.h>
#include <asm/types.h>
#include <asm/regs.h>

/* Assertions. */

#if (XCHAL_HAVE_WINDOWED != 1)
# error Linux requires the Xtensa Windowed Registers Option.
#endif

/* Xtensa ABI requires stack alignment to be at least 16 */

#define STACK_ALIGN (XCHAL_DATA_WIDTH > 16 ? XCHAL_DATA_WIDTH : 16)

#define ARCH_SLAB_MINALIGN STACK_ALIGN

/*
 * User space process size: 1 GB.
 * Windowed call ABI requires caller and callee to be located within the same
 * 1 GB region. The C compiler places trampoline code on the stack for sources
 * that take the address of a nested C function (a feature used by glibc), so
 * the 1 GB requirement applies to the stack as well.
 */

#ifdef CONFIG_MMU
#define TASK_SIZE	__XTENSA_UL_CONST(0x40000000)
#else
#define TASK_SIZE	__XTENSA_UL_CONST(0xffffffff)
#endif

#define STACK_TOP	TASK_SIZE
#define STACK_TOP_MAX	STACK_TOP

/*
 * General exception cause assigned to fake NMI. Fake NMI needs to be handled
 * differently from other interrupts, but it uses common kernel entry/exit
 * code.
 */

#define EXCCAUSE_MAPPED_NMI	62

/*
 * General exception cause assigned to debug exceptions. Debug exceptions go
 * to their own vector, rather than the general exception vectors (user,
 * kernel, double); and their specific causes are reported via DEBUGCAUSE
 * rather than EXCCAUSE.  However it is sometimes convenient to redirect debug
 * exceptions to the general exception mechanism.  To do this, an otherwise
 * unused EXCCAUSE value was assigned to debug exceptions for this purpose.
 */

#define EXCCAUSE_MAPPED_DEBUG	63

/*
 * We use DEPC also as a flag to distinguish between double and regular
 * exceptions. For performance reasons, DEPC might contain the value of
 * EXCCAUSE for regular exceptions, so we use this definition to mark a
 * valid double exception address.
 * (Note: We use it in bgeui, so it should be 64, 128, or 256)
 */

#define VALID_DOUBLE_EXCEPTION_ADDRESS	64

#define XTENSA_INT_LEVEL(intno) _XTENSA_INT_LEVEL(intno)
#define _XTENSA_INT_LEVEL(intno) XCHAL_INT##intno##_LEVEL

#define XTENSA_INTLEVEL_MASK(level) _XTENSA_INTLEVEL_MASK(level)
#define _XTENSA_INTLEVEL_MASK(level) (XCHAL_INTLEVEL##level##_MASK)

#define XTENSA_INTLEVEL_ANDBELOW_MASK(l) _XTENSA_INTLEVEL_ANDBELOW_MASK(l)
#define _XTENSA_INTLEVEL_ANDBELOW_MASK(l) (XCHAL_INTLEVEL##l##_ANDBELOW_MASK)

#define PROFILING_INTLEVEL XTENSA_INT_LEVEL(XCHAL_PROFILING_INTERRUPT)

/* LOCKLEVEL defines the interrupt level that masks all
 * general-purpose interrupts.
 */
#if defined(CONFIG_XTENSA_FAKE_NMI) && defined(XCHAL_PROFILING_INTERRUPT)
#define LOCKLEVEL (PROFILING_INTLEVEL - 1)
#else
#define LOCKLEVEL XCHAL_EXCM_LEVEL
#endif

#define TOPLEVEL XCHAL_EXCM_LEVEL
#define XTENSA_FAKE_NMI (LOCKLEVEL < TOPLEVEL)

/* WSBITS and WBBITS are the width of the WINDOWSTART and WINDOWBASE
 * registers
 */
#define WSBITS  (XCHAL_NUM_AREGS / 4)      /* width of WINDOWSTART in bits */
#define WBBITS  (XCHAL_NUM_AREGS_LOG2 - 2) /* width of WINDOWBASE in bits */

#ifndef __ASSEMBLY__

/* Build a valid return address for the specified call winsize.
 * winsize must be 1 (call4), 2 (call8), or 3 (call12)
 */
#define MAKE_RA_FOR_CALL(ra,ws)   (((ra) & 0x3fffffff) | (ws) << 30)

/* Convert return address to a valid pc
 * Note: We assume that the stack pointer is in the same 1GB ranges as the ra
 */
#define MAKE_PC_FROM_RA(ra,sp)    (((ra) & 0x3fffffff) | ((sp) & 0xc0000000))

/* Spill slot location for the register reg in the spill area under the stack
 * pointer sp. reg must be in the range [0..4).
 */
#define SPILL_SLOT(sp, reg) (*(((unsigned long *)(sp)) - 4 + (reg)))

/* Spill slot location for the register reg in the spill area under the stack
 * pointer sp for the call8. reg must be in the range [4..8).
 */
#define SPILL_SLOT_CALL8(sp, reg) (*(((unsigned long *)(sp)) - 12 + (reg)))

/* Spill slot location for the register reg in the spill area under the stack
 * pointer sp for the call12. reg must be in the range [4..12).
 */
#define SPILL_SLOT_CALL12(sp, reg) (*(((unsigned long *)(sp)) - 16 + (reg)))

typedef struct {
	unsigned long seg;
} mm_segment_t;

struct thread_struct {

	/* kernel's return address and stack pointer for context switching */
	unsigned long ra; /* kernel's a0: return address and window call size */
	unsigned long sp; /* kernel's a1: stack pointer */

	mm_segment_t current_ds;    /* see uaccess.h for example uses */

	/* struct xtensa_cpuinfo info; */

	unsigned long bad_vaddr; /* last user fault */
	unsigned long bad_uaddr; /* last kernel fault accessing user space */
	unsigned long error_code;
#ifdef CONFIG_HAVE_HW_BREAKPOINT
	struct perf_event *ptrace_bp[XCHAL_NUM_IBREAK];
	struct perf_event *ptrace_wp[XCHAL_NUM_DBREAK];
#endif
	/* Make structure 16 bytes aligned. */
	int align[0] __attribute__ ((aligned(16)));
};


/*
 * Default implementation of macro that returns current
 * instruction pointer ("program counter").
 */
#define current_text_addr()  ({ __label__ _l; _l: &&_l;})


/* This decides where the kernel will search for a free chunk of vm
 * space during mmap's.
 */
#define TASK_UNMAPPED_BASE	(TASK_SIZE / 2)

#define INIT_THREAD  \
{									\
	ra:		0, 						\
	sp:		sizeof(init_stack) + (long) &init_stack,	\
	current_ds:	{0},						\
	/*info:		{0}, */						\
	bad_vaddr:	0,						\
	bad_uaddr:	0,						\
	error_code:	0,						\
}


/*
 * Do necessary setup to start up a newly executed thread.
 * Note: We set-up ps as if we did a call4 to the new pc.
 *       set_thread_state in signal.c depends on it.
 */
#define USER_PS_VALUE ((1 << PS_WOE_BIT) |				\
		       (1 << PS_CALLINC_SHIFT) |			\
		       (USER_RING << PS_RING_SHIFT) |			\
		       (1 << PS_UM_BIT) |				\
		       (1 << PS_EXCM_BIT))

/* Clearing a0 terminates the backtrace. */
#define start_thread(regs, new_pc, new_sp) \
	memset(regs, 0, sizeof(*regs)); \
	regs->pc = new_pc; \
	regs->ps = USER_PS_VALUE; \
	regs->areg[1] = new_sp; \
	regs->areg[0] = 0; \
	regs->wmask = 1; \
	regs->depc = 0; \
	regs->windowbase = 0; \
	regs->windowstart = 1;

/* Forward declaration */
struct task_struct;
struct mm_struct;

/* Free all resources held by a thread. */
#define release_thread(thread) do { } while(0)

extern unsigned long get_wchan(struct task_struct *p);

#define KSTK_EIP(tsk)		(task_pt_regs(tsk)->pc)
#define KSTK_ESP(tsk)		(task_pt_regs(tsk)->areg[1])

#define cpu_relax()  barrier()

/* Special register access. */

#define WSR(v,sr) __asm__ __volatile__ ("wsr %0,"__stringify(sr) :: "a"(v));
#define RSR(v,sr) __asm__ __volatile__ ("rsr %0,"__stringify(sr) : "=a"(v));

#define set_sr(x,sr) ({unsigned int v=(unsigned int)x; WSR(v,sr);})
#define get_sr(sr) ({unsigned int v; RSR(v,sr); v; })

#ifndef XCHAL_HAVE_EXTERN_REGS
#define XCHAL_HAVE_EXTERN_REGS 0
#endif

#if XCHAL_HAVE_EXTERN_REGS

static inline void set_er(unsigned long value, unsigned long addr)
{
	asm volatile ("wer %0, %1" : : "a" (value), "a" (addr) : "memory");
}

static inline unsigned long get_er(unsigned long addr)
{
	register unsigned long value;
	asm volatile ("rer %0, %1" : "=a" (value) : "a" (addr) : "memory");
	return value;
}

#endif /* XCHAL_HAVE_EXTERN_REGS */

#endif	/* __ASSEMBLY__ */
#endif	/* _XTENSA_PROCESSOR_H */

Filemanager

Name Type Size Permission Actions
Kbuild File 685 B 0644
asm-offsets.h File 35 B 0644
asm-uaccess.h File 4.11 KB 0644
asmmacro.h File 2.76 KB 0644
atomic.h File 7.38 KB 0644
barrier.h File 542 B 0644
bitops.h File 5.08 KB 0644
bootparam.h File 1.37 KB 0644
bugs.h File 451 B 0644
cache.h File 969 B 0644
cacheasm.h File 3.77 KB 0644
cacheflush.h File 5.76 KB 0644
checksum.h File 6 KB 0644
cmpxchg.h File 3.9 KB 0644
coprocessor.h File 5.05 KB 0644
current.h File 675 B 0644
delay.h File 1.63 KB 0644
dma-mapping.h File 855 B 0644
dma.h File 1.79 KB 0644
elf.h File 5.75 KB 0644
fixmap.h File 2.5 KB 0644
flat.h File 686 B 0644
ftrace.h File 979 B 0644
futex.h File 2.59 KB 0644
highmem.h File 2.33 KB 0644
hw_breakpoint.h File 1.45 KB 0644
hw_irq.h File 320 B 0644
initialize_mmu.h File 4.58 KB 0644
io.h File 2.09 KB 0644
irq.h File 1.46 KB 0644
irqflags.h File 1.99 KB 0644
kmem_layout.h File 2.07 KB 0644
mmu.h File 462 B 0644
mmu_context.h File 3.62 KB 0644
module.h File 525 B 0644
mxregs.h File 1.3 KB 0644
nommu_context.h File 602 B 0644
page.h File 5.69 KB 0644
pci-bridge.h File 2.16 KB 0644
pci.h File 1.37 KB 0644
perf_event.h File 108 B 0644
pgalloc.h File 1.84 KB 0644
pgtable.h File 14.89 KB 0644
platform.h File 1.75 KB 0644
processor.h File 7.44 KB 0644
ptrace.h File 3.74 KB 0644
regs.h File 3.87 KB 0644
segment.h File 376 B 0644
serial.h File 443 B 0644
shmparam.h File 561 B 0644
signal.h File 502 B 0644
smp.h File 967 B 0644
spinlock.h File 4.6 KB 0644
spinlock_types.h File 412 B 0644
stacktrace.h File 1.13 KB 0644
string.h File 2.65 KB 0644
switch_to.h File 601 B 0644
syscall.h File 982 B 0644
sysmem.h File 426 B 0644
thread_info.h File 3.62 KB 0644
timex.h File 1.79 KB 0644
tlb.h File 1.1 KB 0644
tlbflush.h File 5.53 KB 0644
traps.h File 1.87 KB 0644
types.h File 501 B 0644
uaccess.h File 8.67 KB 0644
ucontext.h File 540 B 0644
unaligned.h File 864 B 0644
unistd.h File 639 B 0644
user.h File 507 B 0644
vectors.h File 4.05 KB 0644
vga.h File 434 B 0644