265 lines
7.7 KiB
C
265 lines
7.7 KiB
C
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/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2001 - 2008 Tensilica Inc.
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* Copyright (C) 2015 Cadence Design Systems Inc.
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*/
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#ifndef _XTENSA_PROCESSOR_H
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#define _XTENSA_PROCESSOR_H
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#include <asm/core.h>
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#include <linux/compiler.h>
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#include <linux/stringify.h>
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#include <asm/ptrace.h>
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#include <asm/types.h>
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#include <asm/regs.h>
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#define ARCH_SLAB_MINALIGN XTENSA_STACK_ALIGNMENT
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/*
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* User space process size: 1 GB.
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* Windowed call ABI requires caller and callee to be located within the same
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* 1 GB region. The C compiler places trampoline code on the stack for sources
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* that take the address of a nested C function (a feature used by glibc), so
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* the 1 GB requirement applies to the stack as well.
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*/
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#ifdef CONFIG_MMU
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#define TASK_SIZE __XTENSA_UL_CONST(0x40000000)
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#else
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#define TASK_SIZE __XTENSA_UL_CONST(0xffffffff)
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#endif
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#define STACK_TOP TASK_SIZE
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#define STACK_TOP_MAX STACK_TOP
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/*
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* General exception cause assigned to fake NMI. Fake NMI needs to be handled
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* differently from other interrupts, but it uses common kernel entry/exit
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* code.
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*/
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#define EXCCAUSE_MAPPED_NMI 62
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/*
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* General exception cause assigned to debug exceptions. Debug exceptions go
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* to their own vector, rather than the general exception vectors (user,
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* kernel, double); and their specific causes are reported via DEBUGCAUSE
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* rather than EXCCAUSE. However it is sometimes convenient to redirect debug
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* exceptions to the general exception mechanism. To do this, an otherwise
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* unused EXCCAUSE value was assigned to debug exceptions for this purpose.
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*/
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#define EXCCAUSE_MAPPED_DEBUG 63
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/*
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* We use DEPC also as a flag to distinguish between double and regular
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* exceptions. For performance reasons, DEPC might contain the value of
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* EXCCAUSE for regular exceptions, so we use this definition to mark a
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* valid double exception address.
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* (Note: We use it in bgeui, so it should be 64, 128, or 256)
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*/
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#define VALID_DOUBLE_EXCEPTION_ADDRESS 64
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#define XTENSA_INT_LEVEL(intno) _XTENSA_INT_LEVEL(intno)
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#define _XTENSA_INT_LEVEL(intno) XCHAL_INT##intno##_LEVEL
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#define XTENSA_INTLEVEL_MASK(level) _XTENSA_INTLEVEL_MASK(level)
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#define _XTENSA_INTLEVEL_MASK(level) (XCHAL_INTLEVEL##level##_MASK)
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#define XTENSA_INTLEVEL_ANDBELOW_MASK(l) _XTENSA_INTLEVEL_ANDBELOW_MASK(l)
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#define _XTENSA_INTLEVEL_ANDBELOW_MASK(l) (XCHAL_INTLEVEL##l##_ANDBELOW_MASK)
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#define PROFILING_INTLEVEL XTENSA_INT_LEVEL(XCHAL_PROFILING_INTERRUPT)
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/* LOCKLEVEL defines the interrupt level that masks all
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* general-purpose interrupts.
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*/
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#if defined(CONFIG_XTENSA_FAKE_NMI) && defined(XCHAL_PROFILING_INTERRUPT)
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#define LOCKLEVEL (PROFILING_INTLEVEL - 1)
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#else
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#define LOCKLEVEL XCHAL_EXCM_LEVEL
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#endif
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#define TOPLEVEL XCHAL_EXCM_LEVEL
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#define XTENSA_FAKE_NMI (LOCKLEVEL < TOPLEVEL)
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/* WSBITS and WBBITS are the width of the WINDOWSTART and WINDOWBASE
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* registers
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*/
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#define WSBITS (XCHAL_NUM_AREGS / 4) /* width of WINDOWSTART in bits */
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#define WBBITS (XCHAL_NUM_AREGS_LOG2 - 2) /* width of WINDOWBASE in bits */
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#if defined(__XTENSA_WINDOWED_ABI__)
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#define KERNEL_PS_WOE_MASK PS_WOE_MASK
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#elif defined(__XTENSA_CALL0_ABI__)
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#define KERNEL_PS_WOE_MASK 0
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#else
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#error Unsupported xtensa ABI
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#endif
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#ifndef __ASSEMBLY__
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#if defined(__XTENSA_WINDOWED_ABI__)
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/* Build a valid return address for the specified call winsize.
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* winsize must be 1 (call4), 2 (call8), or 3 (call12)
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*/
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#define MAKE_RA_FOR_CALL(ra,ws) (((ra) & 0x3fffffff) | (ws) << 30)
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/* Convert return address to a valid pc
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* Note: We assume that the stack pointer is in the same 1GB ranges as the ra
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*/
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#define MAKE_PC_FROM_RA(ra,sp) (((ra) & 0x3fffffff) | ((sp) & 0xc0000000))
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#elif defined(__XTENSA_CALL0_ABI__)
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/* Build a valid return address for the specified call winsize.
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* winsize must be 1 (call4), 2 (call8), or 3 (call12)
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*/
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#define MAKE_RA_FOR_CALL(ra, ws) (ra)
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/* Convert return address to a valid pc
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* Note: We assume that the stack pointer is in the same 1GB ranges as the ra
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*/
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#define MAKE_PC_FROM_RA(ra, sp) (ra)
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#else
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#error Unsupported Xtensa ABI
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#endif
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/* Spill slot location for the register reg in the spill area under the stack
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* pointer sp. reg must be in the range [0..4).
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*/
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#define SPILL_SLOT(sp, reg) (*(((unsigned long *)(sp)) - 4 + (reg)))
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/* Spill slot location for the register reg in the spill area under the stack
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* pointer sp for the call8. reg must be in the range [4..8).
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*/
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#define SPILL_SLOT_CALL8(sp, reg) (*(((unsigned long *)(sp)) - 12 + (reg)))
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/* Spill slot location for the register reg in the spill area under the stack
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* pointer sp for the call12. reg must be in the range [4..12).
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*/
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#define SPILL_SLOT_CALL12(sp, reg) (*(((unsigned long *)(sp)) - 16 + (reg)))
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struct thread_struct {
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/* kernel's return address and stack pointer for context switching */
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unsigned long ra; /* kernel's a0: return address and window call size */
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unsigned long sp; /* kernel's a1: stack pointer */
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#ifdef CONFIG_HAVE_HW_BREAKPOINT
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struct perf_event *ptrace_bp[XCHAL_NUM_IBREAK];
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struct perf_event *ptrace_wp[XCHAL_NUM_DBREAK];
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#endif
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/* Make structure 16 bytes aligned. */
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int align[0] __attribute__ ((aligned(16)));
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};
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/* This decides where the kernel will search for a free chunk of vm
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* space during mmap's.
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*/
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#define TASK_UNMAPPED_BASE (TASK_SIZE / 2)
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#define INIT_THREAD \
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{ \
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ra: 0, \
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sp: sizeof(init_stack) + (long) &init_stack, \
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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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* Note: When windowed ABI is used for userspace we set-up ps
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* as if we did a call4 to the new pc.
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* set_thread_state in signal.c depends on it.
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*/
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#if IS_ENABLED(CONFIG_USER_ABI_CALL0)
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#define USER_PS_VALUE ((USER_RING << PS_RING_SHIFT) | \
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(1 << PS_UM_BIT) | \
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(1 << PS_EXCM_BIT))
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#else
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#define USER_PS_VALUE (PS_WOE_MASK | \
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(1 << PS_CALLINC_SHIFT) | \
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(USER_RING << PS_RING_SHIFT) | \
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(1 << PS_UM_BIT) | \
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(1 << PS_EXCM_BIT))
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#endif
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/* Clearing a0 terminates the backtrace. */
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#define start_thread(regs, new_pc, new_sp) \
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do { \
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unsigned long syscall = (regs)->syscall; \
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unsigned long current_aregs[16]; \
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memcpy(current_aregs, (regs)->areg, sizeof(current_aregs)); \
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memset((regs), 0, sizeof(*(regs))); \
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(regs)->pc = (new_pc); \
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(regs)->ps = USER_PS_VALUE; \
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memcpy((regs)->areg, current_aregs, sizeof(current_aregs)); \
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(regs)->areg[1] = (new_sp); \
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(regs)->areg[0] = 0; \
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(regs)->wmask = 1; \
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(regs)->depc = 0; \
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(regs)->windowbase = 0; \
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(regs)->windowstart = 1; \
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(regs)->syscall = syscall; \
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} while (0)
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/* Forward declaration */
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struct task_struct;
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struct mm_struct;
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extern unsigned long __get_wchan(struct task_struct *p);
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#define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
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#define KSTK_ESP(tsk) (task_pt_regs(tsk)->areg[1])
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#define cpu_relax() barrier()
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/* Special register access. */
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#define xtensa_set_sr(x, sr) \
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({ \
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__asm__ __volatile__ ("wsr %0, "__stringify(sr) :: \
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"a"((unsigned int)(x))); \
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})
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#define xtensa_get_sr(sr) \
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({ \
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unsigned int v; \
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__asm__ __volatile__ ("rsr %0, "__stringify(sr) : "=a"(v)); \
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v; \
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})
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#define xtensa_xsr(x, sr) \
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({ \
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unsigned int __v__ = (unsigned int)(x); \
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__asm__ __volatile__ ("xsr %0, " __stringify(sr) : "+a"(__v__)); \
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__v__; \
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})
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#if XCHAL_HAVE_EXTERN_REGS
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static inline void set_er(unsigned long value, unsigned long addr)
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{
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asm volatile ("wer %0, %1" : : "a" (value), "a" (addr) : "memory");
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}
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static inline unsigned long get_er(unsigned long addr)
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{
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register unsigned long value;
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asm volatile ("rer %0, %1" : "=a" (value) : "a" (addr) : "memory");
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return value;
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}
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#endif /* XCHAL_HAVE_EXTERN_REGS */
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#endif /* __ASSEMBLY__ */
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#endif /* _XTENSA_PROCESSOR_H */
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