arch/arm/kernel/asm-offsets.c

   1 /*
   2  * Copyright (C) 1995-2003 Russell King
   3  *               2001-2002 Keith Owens
   4  *
   5  * Generate definitions needed by assembly language modules.
   6  * This code generates raw asm output which is post-processed to extract
   7  * and format the required data.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13 #include <linux/sched.h>
  14 #include <linux/mm.h>
  15 #include <asm/mach/arch.h>
  16 #include <asm/thread_info.h>
  17 #include <asm/memory.h>
  18 #include <asm/procinfo.h>
  19
  20 /*
  21  * Make sure that the compiler and target are compatible.
  22  */
  23 #if defined(__APCS_26__)
  24 #error Sorry, your compiler targets APCS-26 but this kernel requires APCS-32
  25 #endif
  26 /*
  27  * GCC 3.0, 3.1: general bad code generation.
  28  * GCC 3.2.0: incorrect function argument offset calculation.
  29  * GCC 3.2.x: miscompiles NEW_AUX_ENT in fs/binfmt_elf.c
  30  *            (http://gcc.gnu.org/PR8896) and incorrect structure
  31  *            initialisation in fs/jffs2/erase.c
  32  */
  33 #if (__GNUC__ == 3 && __GNUC_MINOR__ < 3)
  34 #error Your compiler is too buggy; it is known to miscompile kernels.
  35 #error    Known good compilers: 3.3
  36 #endif
  37
  38 /* Use marker if you need to separate the values later */
  39
  40 #define DEFINE(sym, val) \
  41         asm volatile("\n->" #sym " %0 " #val : : "i" (val))
  42
  43 #define BLANK() asm volatile("\n->" : : )
  44
  45 int main(void)
  46 {
  47   DEFINE(TSK_ACTIVE_MM,         offsetof(struct task_struct, active_mm));
  48   BLANK();
  49   DEFINE(TI_FLAGS,              offsetof(struct thread_info, flags));
  50   DEFINE(TI_PREEMPT,            offsetof(struct thread_info, preempt_count));
  51   DEFINE(TI_ADDR_LIMIT,         offsetof(struct thread_info, addr_limit));
  52   DEFINE(TI_TASK,               offsetof(struct thread_info, task));
  53   DEFINE(TI_EXEC_DOMAIN,        offsetof(struct thread_info, exec_domain));
  54   DEFINE(TI_CPU,                offsetof(struct thread_info, cpu));
  55   DEFINE(TI_CPU_DOMAIN,         offsetof(struct thread_info, cpu_domain));
  56   DEFINE(TI_CPU_SAVE,           offsetof(struct thread_info, cpu_context));
  57   DEFINE(TI_USED_CP,            offsetof(struct thread_info, used_cp));
  58   DEFINE(TI_TP_VALUE,           offsetof(struct thread_info, tp_value));
  59   DEFINE(TI_FPSTATE,            offsetof(struct thread_info, fpstate));
  60   DEFINE(TI_VFPSTATE,           offsetof(struct thread_info, vfpstate));
  61 #ifdef CONFIG_IWMMXT
  62   DEFINE(TI_IWMMXT_STATE,       offsetof(struct thread_info, fpstate.iwmmxt));
  63 #endif
  64 #ifdef CONFIG_CRUNCH
  65   DEFINE(TI_CRUNCH_STATE,       offsetof(struct thread_info, crunchstate));
  66 #endif
  67   BLANK();
  68   DEFINE(S_R0,                  offsetof(struct pt_regs, ARM_r0));
  69   DEFINE(S_R1,                  offsetof(struct pt_regs, ARM_r1));
  70   DEFINE(S_R2,                  offsetof(struct pt_regs, ARM_r2));
  71   DEFINE(S_R3,                  offsetof(struct pt_regs, ARM_r3));
  72   DEFINE(S_R4,                  offsetof(struct pt_regs, ARM_r4));
  73   DEFINE(S_R5,                  offsetof(struct pt_regs, ARM_r5));
  74   DEFINE(S_R6,                  offsetof(struct pt_regs, ARM_r6));
  75   DEFINE(S_R7,                  offsetof(struct pt_regs, ARM_r7));
  76   DEFINE(S_R8,                  offsetof(struct pt_regs, ARM_r8));
  77   DEFINE(S_R9,                  offsetof(struct pt_regs, ARM_r9));
  78   DEFINE(S_R10,                 offsetof(struct pt_regs, ARM_r10));
  79   DEFINE(S_FP,                  offsetof(struct pt_regs, ARM_fp));
  80   DEFINE(S_IP,                  offsetof(struct pt_regs, ARM_ip));
  81   DEFINE(S_SP,                  offsetof(struct pt_regs, ARM_sp));
  82   DEFINE(S_LR,                  offsetof(struct pt_regs, ARM_lr));
  83   DEFINE(S_PC,                  offsetof(struct pt_regs, ARM_pc));
  84   DEFINE(S_PSR,                 offsetof(struct pt_regs, ARM_cpsr));
  85   DEFINE(S_OLD_R0,              offsetof(struct pt_regs, ARM_ORIG_r0));
  86   DEFINE(S_FRAME_SIZE,          sizeof(struct pt_regs));
  87   BLANK();
  88 #ifdef CONFIG_CPU_HAS_ASID
  89   DEFINE(MM_CONTEXT_ID,         offsetof(struct mm_struct, context.id));
  90   BLANK();
  91 #endif
  92   DEFINE(VMA_VM_MM,             offsetof(struct vm_area_struct, vm_mm));
  93   DEFINE(VMA_VM_FLAGS,          offsetof(struct vm_area_struct, vm_flags));
  94   BLANK();
  95   DEFINE(VM_EXEC,               VM_EXEC);
  96   BLANK();
  97   DEFINE(PAGE_SZ,               PAGE_SIZE);
  98   BLANK();
  99   DEFINE(SYS_ERROR0,            0x9f0000);
 100   BLANK();
 101   DEFINE(SIZEOF_MACHINE_DESC,   sizeof(struct machine_desc));
 102   DEFINE(MACHINFO_TYPE,         offsetof(struct machine_desc, nr));
 103   DEFINE(MACHINFO_NAME,         offsetof(struct machine_desc, name));
 104   DEFINE(MACHINFO_PHYSIO,       offsetof(struct machine_desc, phys_io));
 105   DEFINE(MACHINFO_PGOFFIO,      offsetof(struct machine_desc, io_pg_offst));
 106   BLANK();
 107   DEFINE(PROC_INFO_SZ,          sizeof(struct proc_info_list));
 108   DEFINE(PROCINFO_INITFUNC,     offsetof(struct proc_info_list, __cpu_flush));
 109   DEFINE(PROCINFO_MM_MMUFLAGS,  offsetof(struct proc_info_list, __cpu_mm_mmu_flags));
 110   DEFINE(PROCINFO_IO_MMUFLAGS,  offsetof(struct proc_info_list, __cpu_io_mmu_flags));
 111   return 0;
 112 }