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ARC: Fundamental ARCH data-types/defines
* L1_CACHE_SHIFT * PAGE_SIZE, PAGE_OFFSET * struct pt_regs, struct user_regs_struct * struct thread_struct, cpu_relax(), task_pt_regs(), start_thread(), ... * struct thread_info, THREAD_SIZE, INIT_THREAD_INFO(), TIF_*, ... * BUG() * ELF_* * Elf_* To disallow user-space visibility into some of the core kernel data-types such as struct pt_regs, #ifdef __KERNEL__ which also makes the UAPI header spit (further patch in the series) to NOT export it to asm/uapi/ptrace.h Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Cc: Jonas Bonn <jonas.bonn@gmail.com> Cc: Al Viro <viro@ZenIV.linux.org.uk> Acked-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Vineet Gupta
parent
ca15c8ecd5
commit
3be80aaef8
37
arch/arc/include/asm/bug.h
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37
arch/arc/include/asm/bug.h
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/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef _ASM_ARC_BUG_H
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#define _ASM_ARC_BUG_H
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#ifndef __ASSEMBLY__
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#include <asm/ptrace.h>
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struct task_struct;
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void show_regs(struct pt_regs *regs);
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void show_stacktrace(struct task_struct *tsk, struct pt_regs *regs);
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void show_kernel_fault_diag(const char *str, struct pt_regs *regs,
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unsigned long address, unsigned long cause_reg);
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void die(const char *str, struct pt_regs *regs, unsigned long address,
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unsigned long cause_reg);
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#define BUG() do { \
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dump_stack(); \
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pr_warn("Kernel BUG in %s: %s: %d!\n", \
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__FILE__, __func__, __LINE__); \
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} while (0)
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#define HAVE_ARCH_BUG
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#include <asm-generic/bug.h>
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#endif /* !__ASSEMBLY__ */
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#endif
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21
arch/arc/include/asm/cache.h
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21
arch/arc/include/asm/cache.h
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/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ARC_ASM_CACHE_H
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#define __ARC_ASM_CACHE_H
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/* In case $$ not config, setup a dummy number for rest of kernel */
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#ifndef CONFIG_ARC_CACHE_LINE_SHIFT
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#define L1_CACHE_SHIFT 6
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#else
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#define L1_CACHE_SHIFT CONFIG_ARC_CACHE_LINE_SHIFT
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#endif
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#define L1_CACHE_BYTES (1 << L1_CACHE_SHIFT)
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#endif /* _ASM_CACHE_H */
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97
arch/arc/include/asm/elf.h
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97
arch/arc/include/asm/elf.h
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/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ASM_ARC_ELF_H
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#define __ASM_ARC_ELF_H
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#include <asm/ptrace.h>
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#define EM_ARCOMPACT 93
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/* Machine specific ELF Hdr flags */
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#define EF_ARC_OSABI_MSK 0x00000f00
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#define EF_ARC_OSABI_ORIG 0x00000000 /* MUST be zero for back-compat */
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#define EF_ARC_OSABI_V2 0x00000200
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/* ARC Relocations (kernel Modules only) */
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#define R_ARC_32 0x4
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#define R_ARC_32_ME 0x1B
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#define R_ARC_S25H_PCREL 0x10
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#define R_ARC_S25W_PCREL 0x11
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typedef unsigned long elf_greg_t;
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typedef unsigned long elf_fpregset_t;
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/* core dump regs is in the order pt_regs, callee_regs, stop_pc (for gdb) */
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#define ELF_NGREG ((sizeof(struct pt_regs) + sizeof(struct callee_regs) \
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+ sizeof(unsigned long)) / sizeof(elf_greg_t))
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typedef elf_greg_t elf_gregset_t[ELF_NGREG];
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/*
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* To ensure that
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* -we don't load something for the wrong architecture.
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* -The userspace is using the correct syscall ABI
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*/
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struct elf32_hdr;
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extern int elf_check_arch(const struct elf32_hdr *);
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#define elf_check_arch elf_check_arch
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/*
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* These are used to set parameters in the core dumps.
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*/
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#define ELF_ARCH EM_ARCOMPACT
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#define ELF_CLASS ELFCLASS32
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#ifdef CONFIG_CPU_BIG_ENDIAN
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#define ELF_DATA ELFDATA2MSB
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#else
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#define ELF_DATA ELFDATA2LSB
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#endif
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#ifdef __KERNEL__
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#define CORE_DUMP_USE_REGSET
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#define ELF_EXEC_PAGESIZE PAGE_SIZE
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/*
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* This is the location that an ET_DYN program is loaded if exec'ed. Typical
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* use of this is to invoke "./ld.so someprog" to test out a new version of
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* the loader. We need to make sure that it is out of the way of the program
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* that it will "exec", and that there is sufficient room for the brk.
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*/
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#define ELF_ET_DYN_BASE (2 * TASK_SIZE / 3)
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/*
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* When the program starts, a1 contains a pointer to a function to be
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* registered with atexit, as per the SVR4 ABI. A value of 0 means we
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* have no such handler.
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*/
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#define ELF_PLAT_INIT(_r, load_addr) ((_r)->r0 = 0)
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/*
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* This yields a mask that user programs can use to figure out what
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* instruction set this cpu supports.
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*/
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#define ELF_HWCAP (0)
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/*
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* This yields a string that ld.so will use to load implementation
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* specific libraries for optimization. This is more specific in
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* intent than poking at uname or /proc/cpuinfo.
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*/
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#define ELF_PLATFORM (NULL)
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#define SET_PERSONALITY(ex) \
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set_personality(PER_LINUX | (current->personality & (~PER_MASK)))
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#endif /* __KERNEL__ */
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#endif
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15
arch/arc/include/asm/exec.h
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15
arch/arc/include/asm/exec.h
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/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ASM_ARC_EXEC_H
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#define __ASM_ARC_EXEC_H
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/* Align to 16b */
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#define arch_align_stack(p) ((unsigned long)(p) & ~0xf)
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#endif
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19
arch/arc/include/asm/kdebug.h
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19
arch/arc/include/asm/kdebug.h
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/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef _ASM_ARC_KDEBUG_H
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#define _ASM_ARC_KDEBUG_H
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enum die_val {
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DIE_UNUSED,
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DIE_TRAP,
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DIE_IERR,
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DIE_OOPS
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};
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#endif
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30
arch/arc/include/asm/linkage.h
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30
arch/arc/include/asm/linkage.h
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/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ASM_LINKAGE_H
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#define __ASM_LINKAGE_H
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#ifdef __ASSEMBLY__
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/* Can't use the ENTRY macro in linux/linkage.h
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* gas considers ';' as comment vs. newline
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*/
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.macro ARC_ENTRY name
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.global \name
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.align 4
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\name:
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.endm
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.macro ARC_EXIT name
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#define ASM_PREV_SYM_ADDR(name) .-##name
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.size \ name, ASM_PREV_SYM_ADDR(\name)
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.endm
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#endif /* __ASSEMBLY__ */
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#endif
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17
arch/arc/include/asm/module.h
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17
arch/arc/include/asm/module.h
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/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Amit Bhor, Sameer Dhavale: Codito Technologies 2004
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*/
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#ifndef _ASM_ARC_MODULE_H
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#define _ASM_ARC_MODULE_H
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#include <asm-generic/module.h>
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#endif /* _ASM_ARC_MODULE_H */
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42
arch/arc/include/asm/page.h
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42
arch/arc/include/asm/page.h
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/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ASM_ARC_PAGE_H
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#define __ASM_ARC_PAGE_H
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/* PAGE_SHIFT determines the page size */
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#if defined(CONFIG_ARC_PAGE_SIZE_16K)
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#define PAGE_SHIFT 14
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#elif defined(CONFIG_ARC_PAGE_SIZE_4K)
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#define PAGE_SHIFT 12
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#else
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/*
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* Default 8k
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* done this way (instead of under CONFIG_ARC_PAGE_SIZE_8K) because adhoc
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* user code (busybox appletlib.h) expects PAGE_SHIFT to be defined w/o
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* using the correct uClibc header and in their build our autoconf.h is
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* not available
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*/
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#define PAGE_SHIFT 13
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#endif
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#ifdef __ASSEMBLY__
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#define PAGE_SIZE (1 << PAGE_SHIFT)
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#define PAGE_OFFSET (0x80000000)
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#else
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#define PAGE_SIZE (1UL << PAGE_SHIFT) /* Default 8K */
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#define PAGE_OFFSET (0x80000000UL) /* Kernel starts at 2G onwards */
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#endif
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#define PAGE_MASK (~(PAGE_SIZE-1))
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#endif /* !__ASSEMBLY__ */
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#endif /* __KERNEL__ */
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#endif
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143
arch/arc/include/asm/processor.h
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143
arch/arc/include/asm/processor.h
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/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* vineetg: March 2009
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* -Implemented task_pt_regs( )
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*
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* Amit Bhor, Sameer Dhavale, Ashwin Chaugule: Codito Technologies 2004
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*/
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#ifndef __ASM_ARC_PROCESSOR_H
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#define __ASM_ARC_PROCESSOR_H
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#ifdef __KERNEL__
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#ifndef __ASSEMBLY__
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#include <asm/arcregs.h> /* for STATUS_E1_MASK et all */
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/* Arch specific stuff which needs to be saved per task.
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* However these items are not so important so as to earn a place in
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* struct thread_info
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*/
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struct thread_struct {
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unsigned long ksp; /* kernel mode stack pointer */
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unsigned long callee_reg; /* pointer to callee regs */
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unsigned long fault_address; /* dbls as brkpt holder as well */
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unsigned long cause_code; /* Exception Cause Code (ECR) */
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};
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#define INIT_THREAD { \
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.ksp = sizeof(init_stack) + (unsigned long) init_stack, \
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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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/*
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* Return saved PC of a blocked thread.
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*/
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unsigned long thread_saved_pc(struct task_struct *t);
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#define task_pt_regs(p) \
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((struct pt_regs *)(THREAD_SIZE - 4 + (void *)task_stack_page(p)) - 1)
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/* Free all resources held by a thread. */
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#define release_thread(thread) do { } while (0)
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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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#define cpu_relax() do { } while (0)
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/*
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* Create a new kernel thread
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*/
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extern int kernel_thread(int (*fn) (void *), void *arg, unsigned long flags);
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#define copy_segments(tsk, mm) do { } while (0)
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#define release_segments(mm) do { } while (0)
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#define KSTK_EIP(tsk) (task_pt_regs(tsk)->ret)
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/*
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* Where abouts of Task's sp, fp, blink when it was last seen in kernel mode.
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* These can't be derived from pt_regs as that would give correp user-mode val
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*/
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#define KSTK_ESP(tsk) (tsk->thread.ksp)
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#define KSTK_BLINK(tsk) (*((unsigned int *)((KSTK_ESP(tsk)) + (13+1+1)*4)))
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#define KSTK_FP(tsk) (*((unsigned int *)((KSTK_ESP(tsk)) + (13+1)*4)))
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/*
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* Do necessary setup to start up a newly executed thread.
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||||||
|
*
|
||||||
|
* E1,E2 so that Interrupts are enabled in user mode
|
||||||
|
* L set, so Loop inhibited to begin with
|
||||||
|
* lp_start and lp_end seeded with bogus non-zero values so to easily catch
|
||||||
|
* the ARC700 sr to lp_start hardware bug
|
||||||
|
*/
|
||||||
|
#define start_thread(_regs, _pc, _usp) \
|
||||||
|
do { \
|
||||||
|
set_fs(USER_DS); /* reads from user space */ \
|
||||||
|
(_regs)->ret = (_pc); \
|
||||||
|
/* Interrupts enabled in User Mode */ \
|
||||||
|
(_regs)->status32 = STATUS_U_MASK | STATUS_L_MASK \
|
||||||
|
| STATUS_E1_MASK | STATUS_E2_MASK; \
|
||||||
|
(_regs)->sp = (_usp); \
|
||||||
|
/* bogus seed values for debugging */ \
|
||||||
|
(_regs)->lp_start = 0x10; \
|
||||||
|
(_regs)->lp_end = 0x80; \
|
||||||
|
} while (0)
|
||||||
|
|
||||||
|
extern unsigned int get_wchan(struct task_struct *p);
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Default implementation of macro that returns current
|
||||||
|
* instruction pointer ("program counter").
|
||||||
|
* Should the PC register be read instead ? This macro does not seem to
|
||||||
|
* be used in many places so this wont be all that bad.
|
||||||
|
*/
|
||||||
|
#define current_text_addr() ({ __label__ _l; _l: &&_l; })
|
||||||
|
|
||||||
|
#endif /* !__ASSEMBLY__ */
|
||||||
|
|
||||||
|
/* Kernels Virtual memory area.
|
||||||
|
* Unlike other architectures(MIPS, sh, cris ) ARC 700 does not have a
|
||||||
|
* "kernel translated" region (like KSEG2 in MIPS). So we use a upper part
|
||||||
|
* of the translated bottom 2GB for kernel virtual memory and protect
|
||||||
|
* these pages from user accesses by disabling Ru, Eu and Wu.
|
||||||
|
*/
|
||||||
|
#define VMALLOC_SIZE (0x10000000) /* 256M */
|
||||||
|
#define VMALLOC_START (PAGE_OFFSET - VMALLOC_SIZE)
|
||||||
|
#define VMALLOC_END (PAGE_OFFSET)
|
||||||
|
|
||||||
|
/* Most of the architectures seem to be keeping some kind of padding between
|
||||||
|
* userspace TASK_SIZE and PAGE_OFFSET. i.e TASK_SIZE != PAGE_OFFSET.
|
||||||
|
*/
|
||||||
|
#define USER_KERNEL_GUTTER 0x10000000
|
||||||
|
|
||||||
|
/* User address space:
|
||||||
|
* On ARC700, CPU allows the entire lower half of 32 bit address space to be
|
||||||
|
* translated. Thus potentially 2G (0:0x7FFF_FFFF) could be User vaddr space.
|
||||||
|
* However we steal 256M for kernel addr (0x7000_0000:0x7FFF_FFFF) and another
|
||||||
|
* 256M (0x6000_0000:0x6FFF_FFFF) is gutter between user/kernel spaces
|
||||||
|
* Thus total User vaddr space is (0:0x5FFF_FFFF)
|
||||||
|
*/
|
||||||
|
#define TASK_SIZE (PAGE_OFFSET - VMALLOC_SIZE - USER_KERNEL_GUTTER)
|
||||||
|
|
||||||
|
#define STACK_TOP TASK_SIZE
|
||||||
|
#define STACK_TOP_MAX STACK_TOP
|
||||||
|
|
||||||
|
/* This decides where the kernel will search for a free chunk of vm
|
||||||
|
* space during mmap's.
|
||||||
|
*/
|
||||||
|
#define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
|
||||||
|
|
||||||
|
#endif /* __KERNEL__ */
|
||||||
|
|
||||||
|
#endif /* __ASM_ARC_PROCESSOR_H */
|
||||||
126
arch/arc/include/asm/ptrace.h
Normal file
126
arch/arc/include/asm/ptrace.h
Normal file
@ -0,0 +1,126 @@
|
|||||||
|
/*
|
||||||
|
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
|
||||||
|
*
|
||||||
|
* This program is free software; you can redistribute it and/or modify
|
||||||
|
* it under the terms of the GNU General Public License version 2 as
|
||||||
|
* published by the Free Software Foundation.
|
||||||
|
*
|
||||||
|
* Amit Bhor, Sameer Dhavale: Codito Technologies 2004
|
||||||
|
*/
|
||||||
|
|
||||||
|
#ifndef __ASM_ARC_PTRACE_H
|
||||||
|
#define __ASM_ARC_PTRACE_H
|
||||||
|
|
||||||
|
#ifdef __KERNEL__
|
||||||
|
|
||||||
|
#ifndef __ASSEMBLY__
|
||||||
|
|
||||||
|
/* THE pt_regs: Defines how regs are saved during entry into kernel */
|
||||||
|
|
||||||
|
struct pt_regs {
|
||||||
|
/*
|
||||||
|
* 1 word gutter after reg-file has been saved
|
||||||
|
* Technically not needed, Since SP always points to a "full" location
|
||||||
|
* (vs. "empty"). But pt_regs is shared with tools....
|
||||||
|
*/
|
||||||
|
long res;
|
||||||
|
|
||||||
|
/* Real registers */
|
||||||
|
long bta; /* bta_l1, bta_l2, erbta */
|
||||||
|
long lp_start;
|
||||||
|
long lp_end;
|
||||||
|
long lp_count;
|
||||||
|
long status32; /* status32_l1, status32_l2, erstatus */
|
||||||
|
long ret; /* ilink1, ilink2 or eret */
|
||||||
|
long blink;
|
||||||
|
long fp;
|
||||||
|
long r26; /* gp */
|
||||||
|
long r12;
|
||||||
|
long r11;
|
||||||
|
long r10;
|
||||||
|
long r9;
|
||||||
|
long r8;
|
||||||
|
long r7;
|
||||||
|
long r6;
|
||||||
|
long r5;
|
||||||
|
long r4;
|
||||||
|
long r3;
|
||||||
|
long r2;
|
||||||
|
long r1;
|
||||||
|
long r0;
|
||||||
|
long sp; /* user/kernel sp depending on where we came from */
|
||||||
|
long orig_r0;
|
||||||
|
long orig_r8; /*to distinguish bet excp, sys call, int1 or int2 */
|
||||||
|
};
|
||||||
|
|
||||||
|
/* Callee saved registers - need to be saved only when you are scheduled out */
|
||||||
|
|
||||||
|
struct callee_regs {
|
||||||
|
long res; /* Again this is not needed */
|
||||||
|
long r25;
|
||||||
|
long r24;
|
||||||
|
long r23;
|
||||||
|
long r22;
|
||||||
|
long r21;
|
||||||
|
long r20;
|
||||||
|
long r19;
|
||||||
|
long r18;
|
||||||
|
long r17;
|
||||||
|
long r16;
|
||||||
|
long r15;
|
||||||
|
long r14;
|
||||||
|
long r13;
|
||||||
|
};
|
||||||
|
|
||||||
|
#define instruction_pointer(regs) ((regs)->ret)
|
||||||
|
#define profile_pc(regs) instruction_pointer(regs)
|
||||||
|
|
||||||
|
/* return 1 if user mode or 0 if kernel mode */
|
||||||
|
#define user_mode(regs) (regs->status32 & STATUS_U_MASK)
|
||||||
|
|
||||||
|
#define user_stack_pointer(regs)\
|
||||||
|
({ unsigned int sp; \
|
||||||
|
if (user_mode(regs)) \
|
||||||
|
sp = (regs)->sp;\
|
||||||
|
else \
|
||||||
|
sp = -1; \
|
||||||
|
sp; \
|
||||||
|
})
|
||||||
|
#endif /* !__ASSEMBLY__ */
|
||||||
|
|
||||||
|
#endif /* __KERNEL__ */
|
||||||
|
|
||||||
|
#ifndef __ASSEMBLY__
|
||||||
|
/*
|
||||||
|
* Userspace ABI: Register state needed by
|
||||||
|
* -ptrace (gdbserver)
|
||||||
|
* -sigcontext (SA_SIGNINFO signal frame)
|
||||||
|
*
|
||||||
|
* This is to decouple pt_regs from user-space ABI, to be able to change it
|
||||||
|
* w/o affecting the ABI.
|
||||||
|
* Although the layout (initial padding) is similar to pt_regs to have some
|
||||||
|
* optimizations when copying pt_regs to/from user_regs_struct.
|
||||||
|
*
|
||||||
|
* Also, sigcontext only care about the scratch regs as that is what we really
|
||||||
|
* save/restore for signal handling.
|
||||||
|
*/
|
||||||
|
struct user_regs_struct {
|
||||||
|
|
||||||
|
struct scratch {
|
||||||
|
long pad;
|
||||||
|
long bta, lp_start, lp_end, lp_count;
|
||||||
|
long status32, ret, blink, fp, gp;
|
||||||
|
long r12, r11, r10, r9, r8, r7, r6, r5, r4, r3, r2, r1, r0;
|
||||||
|
long sp;
|
||||||
|
} scratch;
|
||||||
|
struct callee {
|
||||||
|
long pad;
|
||||||
|
long r25, r24, r23, r22, r21, r20;
|
||||||
|
long r19, r18, r17, r16, r15, r14, r13;
|
||||||
|
} callee;
|
||||||
|
long efa; /* break pt addr, for break points in delay slots */
|
||||||
|
long stop_pc; /* give dbg stop_pc directly after checking orig_r8 */
|
||||||
|
};
|
||||||
|
#endif /* !__ASSEMBLY__ */
|
||||||
|
|
||||||
|
#endif /* __ASM_PTRACE_H */
|
||||||
17
arch/arc/include/asm/sections.h
Normal file
17
arch/arc/include/asm/sections.h
Normal file
@ -0,0 +1,17 @@
|
|||||||
|
/*
|
||||||
|
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
|
||||||
|
*
|
||||||
|
* This program is free software; you can redistribute it and/or modify
|
||||||
|
* it under the terms of the GNU General Public License version 2 as
|
||||||
|
* published by the Free Software Foundation.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#ifndef _ASM_ARC_SECTIONS_H
|
||||||
|
#define _ASM_ARC_SECTIONS_H
|
||||||
|
|
||||||
|
#include <asm-generic/sections.h>
|
||||||
|
|
||||||
|
extern char _int_vec_base_lds[];
|
||||||
|
extern char __arc_dccm_base[];
|
||||||
|
|
||||||
|
#endif
|
||||||
121
arch/arc/include/asm/thread_info.h
Normal file
121
arch/arc/include/asm/thread_info.h
Normal file
@ -0,0 +1,121 @@
|
|||||||
|
/*
|
||||||
|
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
|
||||||
|
*
|
||||||
|
* This program is free software; you can redistribute it and/or modify
|
||||||
|
* it under the terms of the GNU General Public License version 2 as
|
||||||
|
* published by the Free Software Foundation.
|
||||||
|
*
|
||||||
|
* Vineetg: Oct 2009
|
||||||
|
* No need for ARC specific thread_info allocator (kmalloc/free). This is
|
||||||
|
* anyways one page allocation, thus slab alloc can be short-circuited and
|
||||||
|
* the generic version (get_free_page) would be loads better.
|
||||||
|
*
|
||||||
|
* Sameer Dhavale: Codito Technologies 2004
|
||||||
|
*/
|
||||||
|
|
||||||
|
#ifndef _ASM_THREAD_INFO_H
|
||||||
|
#define _ASM_THREAD_INFO_H
|
||||||
|
|
||||||
|
#ifdef __KERNEL__
|
||||||
|
|
||||||
|
#include <asm/page.h>
|
||||||
|
|
||||||
|
#ifdef CONFIG_16KSTACKS
|
||||||
|
#define THREAD_SIZE_ORDER 1
|
||||||
|
#else
|
||||||
|
#define THREAD_SIZE_ORDER 0
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
|
||||||
|
|
||||||
|
#ifndef __ASSEMBLY__
|
||||||
|
|
||||||
|
#include <linux/thread_info.h>
|
||||||
|
#include <asm/segment.h>
|
||||||
|
|
||||||
|
/*
|
||||||
|
* low level task data that entry.S needs immediate access to
|
||||||
|
* - this struct should fit entirely inside of one cache line
|
||||||
|
* - this struct shares the supervisor stack pages
|
||||||
|
* - if the contents of this structure are changed, the assembly constants
|
||||||
|
* must also be changed
|
||||||
|
*/
|
||||||
|
struct thread_info {
|
||||||
|
unsigned long flags; /* low level flags */
|
||||||
|
int preempt_count; /* 0 => preemptable, <0 => BUG */
|
||||||
|
struct task_struct *task; /* main task structure */
|
||||||
|
mm_segment_t addr_limit; /* thread address space */
|
||||||
|
struct exec_domain *exec_domain;/* execution domain */
|
||||||
|
__u32 cpu; /* current CPU */
|
||||||
|
unsigned long thr_ptr; /* TLS ptr */
|
||||||
|
struct restart_block restart_block;
|
||||||
|
};
|
||||||
|
|
||||||
|
/*
|
||||||
|
* macros/functions for gaining access to the thread information structure
|
||||||
|
*
|
||||||
|
* preempt_count needs to be 1 initially, until the scheduler is functional.
|
||||||
|
*/
|
||||||
|
#define INIT_THREAD_INFO(tsk) \
|
||||||
|
{ \
|
||||||
|
.task = &tsk, \
|
||||||
|
.exec_domain = &default_exec_domain, \
|
||||||
|
.flags = 0, \
|
||||||
|
.cpu = 0, \
|
||||||
|
.preempt_count = INIT_PREEMPT_COUNT, \
|
||||||
|
.addr_limit = KERNEL_DS, \
|
||||||
|
.restart_block = { \
|
||||||
|
.fn = do_no_restart_syscall, \
|
||||||
|
}, \
|
||||||
|
}
|
||||||
|
|
||||||
|
#define init_thread_info (init_thread_union.thread_info)
|
||||||
|
#define init_stack (init_thread_union.stack)
|
||||||
|
|
||||||
|
static inline __attribute_const__ struct thread_info *current_thread_info(void)
|
||||||
|
{
|
||||||
|
register unsigned long sp asm("sp");
|
||||||
|
return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
|
||||||
|
}
|
||||||
|
|
||||||
|
#endif /* !__ASSEMBLY__ */
|
||||||
|
|
||||||
|
#define PREEMPT_ACTIVE 0x10000000
|
||||||
|
|
||||||
|
/*
|
||||||
|
* thread information flags
|
||||||
|
* - these are process state flags that various assembly files may need to
|
||||||
|
* access
|
||||||
|
* - pending work-to-be-done flags are in LSW
|
||||||
|
* - other flags in MSW
|
||||||
|
*/
|
||||||
|
#define TIF_RESTORE_SIGMASK 0 /* restore sig mask in do_signal() */
|
||||||
|
#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
|
||||||
|
#define TIF_SIGPENDING 2 /* signal pending */
|
||||||
|
#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
|
||||||
|
#define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */
|
||||||
|
#define TIF_SYSCALL_TRACE 15 /* syscall trace active */
|
||||||
|
|
||||||
|
/* true if poll_idle() is polling TIF_NEED_RESCHED */
|
||||||
|
#define TIF_MEMDIE 16
|
||||||
|
|
||||||
|
#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
|
||||||
|
#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
|
||||||
|
#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
|
||||||
|
#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
|
||||||
|
#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
|
||||||
|
#define _TIF_MEMDIE (1<<TIF_MEMDIE)
|
||||||
|
|
||||||
|
/* work to do on interrupt/exception return */
|
||||||
|
#define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
|
||||||
|
_TIF_NOTIFY_RESUME)
|
||||||
|
|
||||||
|
/*
|
||||||
|
* _TIF_ALLWORK_MASK includes SYSCALL_TRACE, but we don't need it.
|
||||||
|
* SYSCALL_TRACE is anways seperately/unconditionally tested right after a
|
||||||
|
* syscall, so all that reamins to be tested is _TIF_WORK_MASK
|
||||||
|
*/
|
||||||
|
|
||||||
|
#endif /* __KERNEL__ */
|
||||||
|
|
||||||
|
#endif /* _ASM_THREAD_INFO_H */
|
||||||
Loading…
Reference in New Issue
Block a user