571d76acda
This change adds support for /proc/sys/debug/exception-trace to tile. Like x86 and sparc, by default it is set to "1", generating a one-line printk whenever a user process crashes. By setting it to "2", we get a much more complete userspace diagnostic at crash time, including a user-space backtrace, register dump, and memory dump around the address of the crash. Some vestiges of the Tilera-internal version of this support are removed with this patch (the show_crashinfo variable and the arch_coredump_signal function). We retain a "crashinfo" boot parameter which allows you to set the boot-time value of exception-trace. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
358 lines
10 KiB
C
358 lines
10 KiB
C
/*
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* Copyright 2010 Tilera Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*/
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#ifndef _ASM_TILE_PROCESSOR_H
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#define _ASM_TILE_PROCESSOR_H
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#ifndef __ASSEMBLY__
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/*
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* NOTE: we don't include <linux/ptrace.h> or <linux/percpu.h> as one
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* normally would, due to #include dependencies.
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*/
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#include <linux/types.h>
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#include <asm/ptrace.h>
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#include <asm/percpu.h>
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#include <arch/chip.h>
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#include <arch/spr_def.h>
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struct task_struct;
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struct thread_struct;
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typedef struct {
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unsigned long seg;
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} mm_segment_t;
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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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void *current_text_addr(void);
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#if CHIP_HAS_TILE_DMA()
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/* Capture the state of a suspended DMA. */
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struct tile_dma_state {
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int enabled;
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unsigned long src;
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unsigned long dest;
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unsigned long strides;
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unsigned long chunk_size;
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unsigned long src_chunk;
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unsigned long dest_chunk;
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unsigned long byte;
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unsigned long status;
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};
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/*
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* A mask of the DMA status register for selecting only the 'running'
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* and 'done' bits.
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*/
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#define DMA_STATUS_MASK \
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(SPR_DMA_STATUS__RUNNING_MASK | SPR_DMA_STATUS__DONE_MASK)
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#endif
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/*
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* Track asynchronous TLB events (faults and access violations)
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* that occur while we are in kernel mode from DMA or the SN processor.
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*/
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struct async_tlb {
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short fault_num; /* original fault number; 0 if none */
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char is_fault; /* was it a fault (vs an access violation) */
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char is_write; /* for fault: was it caused by a write? */
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unsigned long address; /* what address faulted? */
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};
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#ifdef CONFIG_HARDWALL
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struct hardwall_info;
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#endif
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struct thread_struct {
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/* kernel stack pointer */
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unsigned long ksp;
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/* kernel PC */
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unsigned long pc;
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/* starting user stack pointer (for page migration) */
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unsigned long usp0;
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/* pid of process that created this one */
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pid_t creator_pid;
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#if CHIP_HAS_TILE_DMA()
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/* DMA info for suspended threads (byte == 0 means no DMA state) */
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struct tile_dma_state tile_dma_state;
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#endif
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/* User EX_CONTEXT registers */
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unsigned long ex_context[2];
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/* User SYSTEM_SAVE registers */
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unsigned long system_save[4];
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/* User interrupt mask */
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unsigned long long interrupt_mask;
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/* User interrupt-control 0 state */
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unsigned long intctrl_0;
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#if CHIP_HAS_PROC_STATUS_SPR()
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/* Any other miscellaneous processor state bits */
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unsigned long proc_status;
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#endif
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#if !CHIP_HAS_FIXED_INTVEC_BASE()
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/* Interrupt base for PL0 interrupts */
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unsigned long interrupt_vector_base;
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#endif
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#if CHIP_HAS_TILE_RTF_HWM()
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/* Tile cache retry fifo high-water mark */
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unsigned long tile_rtf_hwm;
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#endif
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#if CHIP_HAS_DSTREAM_PF()
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/* Data stream prefetch control */
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unsigned long dstream_pf;
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#endif
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#ifdef CONFIG_HARDWALL
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/* Is this task tied to an activated hardwall? */
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struct hardwall_info *hardwall;
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/* Chains this task into the list at hardwall->list. */
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struct list_head hardwall_list;
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#endif
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#if CHIP_HAS_TILE_DMA()
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/* Async DMA TLB fault information */
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struct async_tlb dma_async_tlb;
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#endif
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#if CHIP_HAS_SN_PROC()
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/* Was static network processor when we were switched out? */
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int sn_proc_running;
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/* Async SNI TLB fault information */
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struct async_tlb sn_async_tlb;
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#endif
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};
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#endif /* !__ASSEMBLY__ */
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/*
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* Start with "sp" this many bytes below the top of the kernel stack.
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* This preserves the invariant that a called function may write to *sp.
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*/
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#define STACK_TOP_DELTA 8
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/*
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* When entering the kernel via a fault, start with the top of the
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* pt_regs structure this many bytes below the top of the page.
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* This aligns the pt_regs structure optimally for cache-line access.
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*/
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#ifdef __tilegx__
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#define KSTK_PTREGS_GAP 48
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#else
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#define KSTK_PTREGS_GAP 56
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#endif
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#ifndef __ASSEMBLY__
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#ifdef __tilegx__
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#define TASK_SIZE_MAX (MEM_LOW_END + 1)
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#else
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#define TASK_SIZE_MAX PAGE_OFFSET
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#endif
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/* TASK_SIZE and related variables are always checked in "current" context. */
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#ifdef CONFIG_COMPAT
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#define COMPAT_TASK_SIZE (1UL << 31)
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#define TASK_SIZE ((current_thread_info()->status & TS_COMPAT) ?\
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COMPAT_TASK_SIZE : TASK_SIZE_MAX)
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#else
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#define TASK_SIZE TASK_SIZE_MAX
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#endif
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/* We provide a minimal "vdso" a la x86; just the sigreturn code for now. */
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#define VDSO_BASE (TASK_SIZE - PAGE_SIZE)
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#define STACK_TOP VDSO_BASE
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/* STACK_TOP_MAX is used temporarily in execve and should not check COMPAT. */
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#define STACK_TOP_MAX TASK_SIZE_MAX
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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, if it is using bottom-up mapping.
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*/
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#define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 3))
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#define HAVE_ARCH_PICK_MMAP_LAYOUT
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#define INIT_THREAD { \
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.ksp = (unsigned long)init_stack + THREAD_SIZE - STACK_TOP_DELTA, \
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.interrupt_mask = -1ULL \
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}
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/* Kernel stack top for the task that first boots on this cpu. */
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DECLARE_PER_CPU(unsigned long, boot_sp);
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/* PC to boot from on this cpu. */
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DECLARE_PER_CPU(unsigned long, boot_pc);
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/* Do necessary setup to start up a newly executed thread. */
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static inline void start_thread(struct pt_regs *regs,
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unsigned long pc, unsigned long usp)
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{
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regs->pc = pc;
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regs->sp = usp;
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}
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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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/* Nothing for now */
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}
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/* Prepare to copy thread state - unlazy all lazy status. */
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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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extern int do_work_pending(struct pt_regs *regs, u32 flags);
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/*
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* Return saved (kernel) PC of a blocked thread.
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* Only used in a printk() in kernel/sched.c, so don't work too hard.
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*/
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#define thread_saved_pc(t) ((t)->thread.pc)
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unsigned long get_wchan(struct task_struct *p);
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/* Return initial ksp value for given task. */
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#define task_ksp0(task) ((unsigned long)(task)->stack + THREAD_SIZE)
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/* Return some info about the user process TASK. */
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#define KSTK_TOP(task) (task_ksp0(task) - STACK_TOP_DELTA)
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#define task_pt_regs(task) \
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((struct pt_regs *)(task_ksp0(task) - KSTK_PTREGS_GAP) - 1)
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#define task_sp(task) (task_pt_regs(task)->sp)
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#define task_pc(task) (task_pt_regs(task)->pc)
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/* Aliases for pc and sp (used in fs/proc/array.c) */
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#define KSTK_EIP(task) task_pc(task)
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#define KSTK_ESP(task) task_sp(task)
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/* Standard format for printing registers and other word-size data. */
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#ifdef __tilegx__
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# define REGFMT "0x%016lx"
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#else
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# define REGFMT "0x%08lx"
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#endif
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/*
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* Do some slow action (e.g. read a slow SPR).
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* Note that this must also have compiler-barrier semantics since
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* it may be used in a busy loop reading memory.
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*/
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static inline void cpu_relax(void)
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{
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__insn_mfspr(SPR_PASS);
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barrier();
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}
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/* Info on this processor (see fs/proc/cpuinfo.c) */
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struct seq_operations;
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extern const struct seq_operations cpuinfo_op;
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/* Provide information about the chip model. */
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extern char chip_model[64];
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/* Data on which physical memory controller corresponds to which NUMA node. */
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extern int node_controller[];
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#if CHIP_HAS_CBOX_HOME_MAP()
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/* Does the heap allocator return hash-for-home pages by default? */
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extern int hash_default;
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/* Should kernel stack pages be hash-for-home? */
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extern int kstack_hash;
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/* Does MAP_ANONYMOUS return hash-for-home pages by default? */
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#define uheap_hash hash_default
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#else
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#define hash_default 0
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#define kstack_hash 0
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#define uheap_hash 0
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#endif
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/* Are we using huge pages in the TLB for kernel data? */
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extern int kdata_huge;
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/* Support standard Linux prefetching. */
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#define ARCH_HAS_PREFETCH
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#define prefetch(x) __builtin_prefetch(x)
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#define PREFETCH_STRIDE CHIP_L2_LINE_SIZE()
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/* Bring a value into the L1D, faulting the TLB if necessary. */
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#ifdef __tilegx__
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#define prefetch_L1(x) __insn_prefetch_l1_fault((void *)(x))
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#else
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#define prefetch_L1(x) __insn_prefetch_L1((void *)(x))
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#endif
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#else /* __ASSEMBLY__ */
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/* Do some slow action (e.g. read a slow SPR). */
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#define CPU_RELAX mfspr zero, SPR_PASS
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#endif /* !__ASSEMBLY__ */
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/* Assembly code assumes that the PL is in the low bits. */
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#if SPR_EX_CONTEXT_1_1__PL_SHIFT != 0
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# error Fix assembly assumptions about PL
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#endif
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/* We sometimes use these macros for EX_CONTEXT_0_1 as well. */
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#if SPR_EX_CONTEXT_1_1__PL_SHIFT != SPR_EX_CONTEXT_0_1__PL_SHIFT || \
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SPR_EX_CONTEXT_1_1__PL_RMASK != SPR_EX_CONTEXT_0_1__PL_RMASK || \
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SPR_EX_CONTEXT_1_1__ICS_SHIFT != SPR_EX_CONTEXT_0_1__ICS_SHIFT || \
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SPR_EX_CONTEXT_1_1__ICS_RMASK != SPR_EX_CONTEXT_0_1__ICS_RMASK
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# error Fix assumptions that EX1 macros work for both PL0 and PL1
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#endif
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/* Allow pulling apart and recombining the PL and ICS bits in EX_CONTEXT. */
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#define EX1_PL(ex1) \
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(((ex1) >> SPR_EX_CONTEXT_1_1__PL_SHIFT) & SPR_EX_CONTEXT_1_1__PL_RMASK)
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#define EX1_ICS(ex1) \
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(((ex1) >> SPR_EX_CONTEXT_1_1__ICS_SHIFT) & SPR_EX_CONTEXT_1_1__ICS_RMASK)
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#define PL_ICS_EX1(pl, ics) \
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(((pl) << SPR_EX_CONTEXT_1_1__PL_SHIFT) | \
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((ics) << SPR_EX_CONTEXT_1_1__ICS_SHIFT))
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/*
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* Provide symbolic constants for PLs.
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* Note that assembly code assumes that USER_PL is zero.
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*/
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#define USER_PL 0
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#if CONFIG_KERNEL_PL == 2
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#define GUEST_PL 1
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#endif
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#define KERNEL_PL CONFIG_KERNEL_PL
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/* SYSTEM_SAVE_K_0 holds the current cpu number ORed with ksp0. */
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#define CPU_LOG_MASK_VALUE 12
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#define CPU_MASK_VALUE ((1 << CPU_LOG_MASK_VALUE) - 1)
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#if CONFIG_NR_CPUS > CPU_MASK_VALUE
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# error Too many cpus!
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#endif
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#define raw_smp_processor_id() \
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((int)__insn_mfspr(SPR_SYSTEM_SAVE_K_0) & CPU_MASK_VALUE)
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#define get_current_ksp0() \
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(__insn_mfspr(SPR_SYSTEM_SAVE_K_0) & ~CPU_MASK_VALUE)
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#define next_current_ksp0(task) ({ \
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unsigned long __ksp0 = task_ksp0(task); \
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int __cpu = raw_smp_processor_id(); \
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BUG_ON(__ksp0 & CPU_MASK_VALUE); \
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__ksp0 | __cpu; \
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})
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#endif /* _ASM_TILE_PROCESSOR_H */
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