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linux-pinenote/arch/tile/include/asm/processor.h
Chris Metcalf 47ad7b9bbe tile: improve stack backtrace 
This commit fixes a number of issues with the tile backtrace code.

- Don't try to identify userspace shared object or executable paths
  if we are doing a backtrace from an interrupt; it's not legal,
  and also unlikely to be interesting.  Likewise, don't try to do
  it for other address spaces, since d_path() assumes it is being
  called in "current" context.

- Move "in_backtrace" from thread_struct to thread_info.
  This way we can access it even if our stack thread_info has been
  clobbered, which makes backtracing more robust.

- Avoid using "current" directly when testing for is_sigreturn().
  Since "current" may be corrupt, we're better off using kbt->task
  explicitly to look up the vdso_base for the current task.
  Conveniently, this simplifies the internal APIs (we only need
  one is_sigreturn() function now).

- Avoid bogus "Odd fault" warning when pc/sp/ex1 are all zero,
  as is true for kernel threads above the last frame.

- Hook into Tejun Heo's dump_stack() framework in lib/dump_stack.c.

- Write last entry in save_stack_trace() as ULONG_MAX, not zero,
  since ftrace (at least) relies on finding that marker.

- Implement save_stack_trace_regs() and save_strack_trace_user(),
  and set CONFIG_USER_STACKTRACE_SUPPORT.

Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>
2015-05-11 11:22:40 -04:00

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/*
* Copyright 2010 Tilera Corporation. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, version 2.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for
* more details.
*/
#ifndef _ASM_TILE_PROCESSOR_H
#define _ASM_TILE_PROCESSOR_H
#include <arch/chip.h>
#ifndef __ASSEMBLY__
/*
* NOTE: we don't include <linux/ptrace.h> or <linux/percpu.h> as one
* normally would, due to #include dependencies.
*/
#include <linux/types.h>
#include <asm/ptrace.h>
#include <asm/percpu.h>
#include <arch/spr_def.h>
struct task_struct;
struct thread_struct;
typedef struct {
unsigned long seg;
} mm_segment_t;
/*
* Default implementation of macro that returns current
* instruction pointer ("program counter").
*/
void *current_text_addr(void);
#if CHIP_HAS_TILE_DMA()
/* Capture the state of a suspended DMA. */
struct tile_dma_state {
int enabled;
unsigned long src;
unsigned long dest;
unsigned long strides;
unsigned long chunk_size;
unsigned long src_chunk;
unsigned long dest_chunk;
unsigned long byte;
unsigned long status;
};
/*
* A mask of the DMA status register for selecting only the 'running'
* and 'done' bits.
*/
#define DMA_STATUS_MASK \
(SPR_DMA_STATUS__RUNNING_MASK | SPR_DMA_STATUS__DONE_MASK)
#endif
/*
* Track asynchronous TLB events (faults and access violations)
* that occur while we are in kernel mode from DMA or the SN processor.
*/
struct async_tlb {
short fault_num; /* original fault number; 0 if none */
char is_fault; /* was it a fault (vs an access violation) */
char is_write; /* for fault: was it caused by a write? */
unsigned long address; /* what address faulted? */
};
#ifdef CONFIG_HARDWALL
struct hardwall_info;
struct hardwall_task {
/* Which hardwall is this task tied to? (or NULL if none) */
struct hardwall_info *info;
/* Chains this task into the list at info->task_head. */
struct list_head list;
};
#ifdef __tilepro__
#define HARDWALL_TYPES 1 /* udn */
#else
#define HARDWALL_TYPES 3 /* udn, idn, and ipi */
#endif
#endif
struct thread_struct {
/* kernel stack pointer */
unsigned long ksp;
/* kernel PC */
unsigned long pc;
/* starting user stack pointer (for page migration) */
unsigned long usp0;
/* pid of process that created this one */
pid_t creator_pid;
#if CHIP_HAS_TILE_DMA()
/* DMA info for suspended threads (byte == 0 means no DMA state) */
struct tile_dma_state tile_dma_state;
#endif
/* User EX_CONTEXT registers */
unsigned long ex_context[2];
/* User SYSTEM_SAVE registers */
unsigned long system_save[4];
/* User interrupt mask */
unsigned long long interrupt_mask;
/* User interrupt-control 0 state */
unsigned long intctrl_0;
/* Any other miscellaneous processor state bits */
unsigned long proc_status;
#if !CHIP_HAS_FIXED_INTVEC_BASE()
/* Interrupt base for PL0 interrupts */
unsigned long interrupt_vector_base;
#endif
/* Tile cache retry fifo high-water mark */
unsigned long tile_rtf_hwm;
#if CHIP_HAS_DSTREAM_PF()
/* Data stream prefetch control */
unsigned long dstream_pf;
#endif
#ifdef CONFIG_HARDWALL
/* Hardwall information for various resources. */
struct hardwall_task hardwall[HARDWALL_TYPES];
#endif
#if CHIP_HAS_TILE_DMA()
/* Async DMA TLB fault information */
struct async_tlb dma_async_tlb;
#endif
};
#endif /* !__ASSEMBLY__ */
/*
* Start with "sp" this many bytes below the top of the kernel stack.
* This allows us to be cache-aware when handling the initial save
* of the pt_regs value to the stack.
*/
#define STACK_TOP_DELTA 64
/*
* When entering the kernel via a fault, start with the top of the
* pt_regs structure this many bytes below the top of the page.
* This aligns the pt_regs structure optimally for cache-line access.
*/
#ifdef __tilegx__
#define KSTK_PTREGS_GAP 48
#else
#define KSTK_PTREGS_GAP 56
#endif
#ifndef __ASSEMBLY__
#ifdef __tilegx__
#define TASK_SIZE_MAX (_AC(1, UL) << (MAX_VA_WIDTH - 1))
#else
#define TASK_SIZE_MAX PAGE_OFFSET
#endif
/* TASK_SIZE and related variables are always checked in "current" context. */
#ifdef CONFIG_COMPAT
#define COMPAT_TASK_SIZE (1UL << 31)
#define TASK_SIZE ((current_thread_info()->status & TS_COMPAT) ?\
COMPAT_TASK_SIZE : TASK_SIZE_MAX)
#else
#define TASK_SIZE TASK_SIZE_MAX
#endif
#define VDSO_BASE ((unsigned long)current->active_mm->context.vdso_base)
#define VDSO_SYM(x) (VDSO_BASE + (unsigned long)(x))
#define STACK_TOP TASK_SIZE
/* STACK_TOP_MAX is used temporarily in execve and should not check COMPAT. */
#define STACK_TOP_MAX TASK_SIZE_MAX
/*
* This decides where the kernel will search for a free chunk of vm
* space during mmap's, if it is using bottom-up mapping.
*/
#define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 3))
#define HAVE_ARCH_PICK_MMAP_LAYOUT
#define INIT_THREAD { \
.ksp = (unsigned long)init_stack + THREAD_SIZE - STACK_TOP_DELTA, \
.interrupt_mask = -1ULL \
}
/* Kernel stack top for the task that first boots on this cpu. */
DECLARE_PER_CPU(unsigned long, boot_sp);
/* PC to boot from on this cpu. */
DECLARE_PER_CPU(unsigned long, boot_pc);
/* Do necessary setup to start up a newly executed thread. */
static inline void start_thread(struct pt_regs *regs,
unsigned long pc, unsigned long usp)
{
regs->pc = pc;
regs->sp = usp;
single_step_execve();
}
/* Free all resources held by a thread. */
static inline void release_thread(struct task_struct *dead_task)
{
/* Nothing for now */
}
extern int do_work_pending(struct pt_regs *regs, u32 flags);
/*
* Return saved (kernel) PC of a blocked thread.
* Only used in a printk() in kernel/sched/core.c, so don't work too hard.
*/
#define thread_saved_pc(t) ((t)->thread.pc)
unsigned long get_wchan(struct task_struct *p);
/* Return initial ksp value for given task. */
#define task_ksp0(task) \
((unsigned long)(task)->stack + THREAD_SIZE - STACK_TOP_DELTA)
/* Return some info about the user process TASK. */
#define task_pt_regs(task) \
((struct pt_regs *)(task_ksp0(task) - KSTK_PTREGS_GAP) - 1)
#define current_pt_regs() \
((struct pt_regs *)((stack_pointer | (THREAD_SIZE - 1)) - \
STACK_TOP_DELTA - (KSTK_PTREGS_GAP - 1)) - 1)
#define task_sp(task) (task_pt_regs(task)->sp)
#define task_pc(task) (task_pt_regs(task)->pc)
/* Aliases for pc and sp (used in fs/proc/array.c) */
#define KSTK_EIP(task) task_pc(task)
#define KSTK_ESP(task) task_sp(task)
/* Fine-grained unaligned JIT support */
#define GET_UNALIGN_CTL(tsk, adr) get_unalign_ctl((tsk), (adr))
#define SET_UNALIGN_CTL(tsk, val) set_unalign_ctl((tsk), (val))
extern int get_unalign_ctl(struct task_struct *tsk, unsigned long adr);
extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val);
/* Standard format for printing registers and other word-size data. */
#ifdef __tilegx__
# define REGFMT "0x%016lx"
#else
# define REGFMT "0x%08lx"
#endif
/*
* Do some slow action (e.g. read a slow SPR).
* Note that this must also have compiler-barrier semantics since
* it may be used in a busy loop reading memory.
*/
static inline void cpu_relax(void)
{
__insn_mfspr(SPR_PASS);
barrier();
}
#define cpu_relax_lowlatency() cpu_relax()
/* Info on this processor (see fs/proc/cpuinfo.c) */
struct seq_operations;
extern const struct seq_operations cpuinfo_op;
/* Provide information about the chip model. */
extern char chip_model[64];
/* Data on which physical memory controller corresponds to which NUMA node. */
extern int node_controller[];
/* Does the heap allocator return hash-for-home pages by default? */
extern int hash_default;
/* Should kernel stack pages be hash-for-home? */
extern int kstack_hash;
/* Does MAP_ANONYMOUS return hash-for-home pages by default? */
#define uheap_hash hash_default
/* Are we using huge pages in the TLB for kernel data? */
extern int kdata_huge;
/* Support standard Linux prefetching. */
#define ARCH_HAS_PREFETCH
#define prefetch(x) __builtin_prefetch(x)
#define PREFETCH_STRIDE CHIP_L2_LINE_SIZE()
/* Bring a value into the L1D, faulting the TLB if necessary. */
#ifdef __tilegx__
#define prefetch_L1(x) __insn_prefetch_l1_fault((void *)(x))
#else
#define prefetch_L1(x) __insn_prefetch_L1((void *)(x))
#endif
#else /* __ASSEMBLY__ */
/* Do some slow action (e.g. read a slow SPR). */
#define CPU_RELAX mfspr zero, SPR_PASS
#endif /* !__ASSEMBLY__ */
/* Assembly code assumes that the PL is in the low bits. */
#if SPR_EX_CONTEXT_1_1__PL_SHIFT != 0
# error Fix assembly assumptions about PL
#endif
/* We sometimes use these macros for EX_CONTEXT_0_1 as well. */
#if SPR_EX_CONTEXT_1_1__PL_SHIFT != SPR_EX_CONTEXT_0_1__PL_SHIFT || \
SPR_EX_CONTEXT_1_1__PL_RMASK != SPR_EX_CONTEXT_0_1__PL_RMASK || \
SPR_EX_CONTEXT_1_1__ICS_SHIFT != SPR_EX_CONTEXT_0_1__ICS_SHIFT || \
SPR_EX_CONTEXT_1_1__ICS_RMASK != SPR_EX_CONTEXT_0_1__ICS_RMASK
# error Fix assumptions that EX1 macros work for both PL0 and PL1
#endif
/* Allow pulling apart and recombining the PL and ICS bits in EX_CONTEXT. */
#define EX1_PL(ex1) \
(((ex1) >> SPR_EX_CONTEXT_1_1__PL_SHIFT) & SPR_EX_CONTEXT_1_1__PL_RMASK)
#define EX1_ICS(ex1) \
(((ex1) >> SPR_EX_CONTEXT_1_1__ICS_SHIFT) & SPR_EX_CONTEXT_1_1__ICS_RMASK)
#define PL_ICS_EX1(pl, ics) \
(((pl) << SPR_EX_CONTEXT_1_1__PL_SHIFT) | \
((ics) << SPR_EX_CONTEXT_1_1__ICS_SHIFT))
/*
* Provide symbolic constants for PLs.
*/
#define USER_PL 0
#if CONFIG_KERNEL_PL == 2
#define GUEST_PL 1
#endif
#define KERNEL_PL CONFIG_KERNEL_PL
/* SYSTEM_SAVE_K_0 holds the current cpu number ORed with ksp0. */
#ifdef __tilegx__
#define CPU_SHIFT 48
#if CHIP_VA_WIDTH() > CPU_SHIFT
# error Too many VA bits!
#endif
#define MAX_CPU_ID ((1 << (64 - CPU_SHIFT)) - 1)
#define raw_smp_processor_id() \
((int)(__insn_mfspr(SPR_SYSTEM_SAVE_K_0) >> CPU_SHIFT))
#define get_current_ksp0() \
((unsigned long)(((long)__insn_mfspr(SPR_SYSTEM_SAVE_K_0) << \
(64 - CPU_SHIFT)) >> (64 - CPU_SHIFT)))
#define next_current_ksp0(task) ({ \
unsigned long __ksp0 = task_ksp0(task) & ((1UL << CPU_SHIFT) - 1); \
unsigned long __cpu = (long)raw_smp_processor_id() << CPU_SHIFT; \
__ksp0 | __cpu; \
})
#else
#define LOG2_NR_CPU_IDS 6
#define MAX_CPU_ID ((1 << LOG2_NR_CPU_IDS) - 1)
#define raw_smp_processor_id() \
((int)__insn_mfspr(SPR_SYSTEM_SAVE_K_0) & MAX_CPU_ID)
#define get_current_ksp0() \
(__insn_mfspr(SPR_SYSTEM_SAVE_K_0) & ~MAX_CPU_ID)
#define next_current_ksp0(task) ({ \
unsigned long __ksp0 = task_ksp0(task); \
int __cpu = raw_smp_processor_id(); \
BUG_ON(__ksp0 & MAX_CPU_ID); \
__ksp0 | __cpu; \
})
#endif
#if CONFIG_NR_CPUS > (MAX_CPU_ID + 1)
# error Too many cpus!
#endif
#endif /* _ASM_TILE_PROCESSOR_H */
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