539e786cc3
Currently, the log-level of show_stack() depends on a platform realization. It creates situations where the headers are printed with lower log level or higher than the stacktrace (depending on a platform or user). Furthermore, it forces the logic decision from user to an architecture side. In result, some users as sysrq/kdb/etc are doing tricks with temporary rising console_loglevel while printing their messages. And in result it not only may print unwanted messages from other CPUs, but also omit printing at all in the unlucky case where the printk() was deferred. Introducing log-level parameter and KERN_UNSUPPRESSED [1] seems an easier approach than introducing more printk buffers. Also, it will consolidate printings with headers. Add log level parameter to show_trace() as a preparation to introduce show_stack_loglvl(). [1]: https://lore.kernel.org/lkml/20190528002412.1625-1-dima@arista.com/T/#u Signed-off-by: Dmitry Safonov <dima@arista.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Rich Felker <dalias@libc.org> Link: http://lkml.kernel.org/r/20200418201944.482088-33-dima@arista.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
208 lines
4.5 KiB
C
208 lines
4.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* include/asm-sh/processor.h
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*
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* Copyright (C) 1999, 2000 Niibe Yutaka
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* Copyright (C) 2002, 2003 Paul Mundt
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*/
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#ifndef __ASM_SH_PROCESSOR_32_H
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#define __ASM_SH_PROCESSOR_32_H
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#ifdef __KERNEL__
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#include <linux/compiler.h>
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#include <linux/linkage.h>
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#include <asm/page.h>
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#include <asm/types.h>
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#include <asm/hw_breakpoint.h>
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/* Core Processor Version Register */
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#define CCN_PVR 0xff000030
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#define CCN_CVR 0xff000040
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#define CCN_PRR 0xff000044
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/*
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* User space process size: 2GB.
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*
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* Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff
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*/
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#define TASK_SIZE 0x7c000000UL
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#define STACK_TOP TASK_SIZE
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#define STACK_TOP_MAX STACK_TOP
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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 PAGE_ALIGN(TASK_SIZE / 3)
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/*
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* Bit of SR register
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*
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* FD-bit:
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* When it's set, it means the processor doesn't have right to use FPU,
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* and it results exception when the floating operation is executed.
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*
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* IMASK-bit:
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* Interrupt level mask
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*/
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#define SR_DSP 0x00001000
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#define SR_IMASK 0x000000f0
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#define SR_FD 0x00008000
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#define SR_MD 0x40000000
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/*
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* DSP structure and data
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*/
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struct sh_dsp_struct {
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unsigned long dsp_regs[14];
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long status;
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};
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/*
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* FPU structure and data
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*/
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struct sh_fpu_hard_struct {
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unsigned long fp_regs[16];
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unsigned long xfp_regs[16];
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unsigned long fpscr;
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unsigned long fpul;
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long status; /* software status information */
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};
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/* Dummy fpu emulator */
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struct sh_fpu_soft_struct {
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unsigned long fp_regs[16];
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unsigned long xfp_regs[16];
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unsigned long fpscr;
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unsigned long fpul;
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unsigned char lookahead;
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unsigned long entry_pc;
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};
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union thread_xstate {
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struct sh_fpu_hard_struct hardfpu;
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struct sh_fpu_soft_struct softfpu;
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};
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struct thread_struct {
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/* Saved registers when thread is descheduled */
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unsigned long sp;
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unsigned long pc;
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/* Various thread flags, see SH_THREAD_xxx */
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unsigned long flags;
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/* Save middle states of ptrace breakpoints */
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struct perf_event *ptrace_bps[HBP_NUM];
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#ifdef CONFIG_SH_DSP
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/* Dsp status information */
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struct sh_dsp_struct dsp_status;
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#endif
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/* Extended processor state */
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union thread_xstate *xstate;
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/*
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* fpu_counter contains the number of consecutive context switches
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* that the FPU is used. If this is over a threshold, the lazy fpu
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* saving becomes unlazy to save the trap. This is an unsigned char
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* so that after 256 times the counter wraps and the behavior turns
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* lazy again; this to deal with bursty apps that only use FPU for
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* a short time
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*/
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unsigned char fpu_counter;
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};
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#define INIT_THREAD { \
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.sp = sizeof(init_stack) + (long) &init_stack, \
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.flags = 0, \
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}
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/* Forward declaration, a strange C thing */
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struct task_struct;
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extern void start_thread(struct pt_regs *regs, unsigned long new_pc, unsigned long new_sp);
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/* Free all resources held by a thread. */
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extern void release_thread(struct task_struct *);
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/*
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* FPU lazy state save handling.
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*/
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static __inline__ void disable_fpu(void)
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{
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unsigned long __dummy;
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/* Set FD flag in SR */
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__asm__ __volatile__("stc sr, %0\n\t"
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"or %1, %0\n\t"
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"ldc %0, sr"
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: "=&r" (__dummy)
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: "r" (SR_FD));
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}
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static __inline__ void enable_fpu(void)
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{
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unsigned long __dummy;
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/* Clear out FD flag in SR */
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__asm__ __volatile__("stc sr, %0\n\t"
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"and %1, %0\n\t"
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"ldc %0, sr"
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: "=&r" (__dummy)
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: "r" (~SR_FD));
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}
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/* Double presision, NANS as NANS, rounding to nearest, no exceptions */
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#define FPSCR_INIT 0x00080000
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#define FPSCR_CAUSE_MASK 0x0001f000 /* Cause bits */
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#define FPSCR_FLAG_MASK 0x0000007c /* Flag bits */
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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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void show_trace(struct task_struct *tsk, unsigned long *sp,
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struct pt_regs *regs, const char *loglvl);
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#ifdef CONFIG_DUMP_CODE
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void show_code(struct pt_regs *regs);
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#else
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static inline void show_code(struct pt_regs *regs)
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{
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}
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#endif
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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)->regs[15])
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#if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH4)
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#define PREFETCH_STRIDE L1_CACHE_BYTES
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#define ARCH_HAS_PREFETCH
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#define ARCH_HAS_PREFETCHW
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static inline void prefetch(const void *x)
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{
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__builtin_prefetch(x, 0, 3);
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}
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static inline void prefetchw(const void *x)
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{
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__builtin_prefetch(x, 1, 3);
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}
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#endif
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#endif /* __KERNEL__ */
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#endif /* __ASM_SH_PROCESSOR_32_H */
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