LXR linux/arch/ia64/kernel/entry.h

   1
   2/*
   3 * Preserved registers that are shared between code in ivt.S and
   4 * entry.S.  Be careful not to step on these!
   5 */
   6#define PRED_LEAVE_SYSCALL      1 /* TRUE iff leave from syscall */
   7#define PRED_KERNEL_STACK       2 /* returning to kernel-stacks? */
   8#define PRED_USER_STACK         3 /* returning to user-stacks? */
   9#define PRED_SYSCALL            4 /* inside a system call? */
  10#define PRED_NON_SYSCALL        5 /* complement of PRED_SYSCALL */
  11
  12#ifdef __ASSEMBLY__
  13# define PASTE2(x,y)    x##y
  14# define PASTE(x,y)     PASTE2(x,y)
  15
  16# define pLvSys         PASTE(p,PRED_LEAVE_SYSCALL)
  17# define pKStk          PASTE(p,PRED_KERNEL_STACK)
  18# define pUStk          PASTE(p,PRED_USER_STACK)
  19# define pSys           PASTE(p,PRED_SYSCALL)
  20# define pNonSys        PASTE(p,PRED_NON_SYSCALL)
  21#endif
  22
  23#define PT(f)           (IA64_PT_REGS_##f##_OFFSET)
  24#define SW(f)           (IA64_SWITCH_STACK_##f##_OFFSET)
  25#define SOS(f)          (IA64_SAL_OS_STATE_##f##_OFFSET)
  26
  27#define PT_REGS_SAVES(off)                      \
  28        .unwabi 3, 'i';                         \
  29        .fframe IA64_PT_REGS_SIZE+16+(off);     \
  30        .spillsp rp, PT(CR_IIP)+16+(off);       \
  31        .spillsp ar.pfs, PT(CR_IFS)+16+(off);   \
  32        .spillsp ar.unat, PT(AR_UNAT)+16+(off); \
  33        .spillsp ar.fpsr, PT(AR_FPSR)+16+(off); \
  34        .spillsp pr, PT(PR)+16+(off);
  35
  36#define PT_REGS_UNWIND_INFO(off)                \
  37        .prologue;                              \
  38        PT_REGS_SAVES(off);                     \
  39        .body
  40
  41#define SWITCH_STACK_SAVES(off)                                                 \
  42        .savesp ar.unat,SW(CALLER_UNAT)+16+(off);                               \
  43        .savesp ar.fpsr,SW(AR_FPSR)+16+(off);                                   \
  44        .spillsp f2,SW(F2)+16+(off); .spillsp f3,SW(F3)+16+(off);               \
  45        .spillsp f4,SW(F4)+16+(off); .spillsp f5,SW(F5)+16+(off);               \
  46        .spillsp f16,SW(F16)+16+(off); .spillsp f17,SW(F17)+16+(off);           \
  47        .spillsp f18,SW(F18)+16+(off); .spillsp f19,SW(F19)+16+(off);           \
  48        .spillsp f20,SW(F20)+16+(off); .spillsp f21,SW(F21)+16+(off);           \
  49        .spillsp f22,SW(F22)+16+(off); .spillsp f23,SW(F23)+16+(off);           \
  50        .spillsp f24,SW(F24)+16+(off); .spillsp f25,SW(F25)+16+(off);           \
  51        .spillsp f26,SW(F26)+16+(off); .spillsp f27,SW(F27)+16+(off);           \
  52        .spillsp f28,SW(F28)+16+(off); .spillsp f29,SW(F29)+16+(off);           \
  53        .spillsp f30,SW(F30)+16+(off); .spillsp f31,SW(F31)+16+(off);           \
  54        .spillsp r4,SW(R4)+16+(off); .spillsp r5,SW(R5)+16+(off);               \
  55        .spillsp r6,SW(R6)+16+(off); .spillsp r7,SW(R7)+16+(off);               \
  56        .spillsp b0,SW(B0)+16+(off); .spillsp b1,SW(B1)+16+(off);               \
  57        .spillsp b2,SW(B2)+16+(off); .spillsp b3,SW(B3)+16+(off);               \
  58        .spillsp b4,SW(B4)+16+(off); .spillsp b5,SW(B5)+16+(off);               \
  59        .spillsp ar.pfs,SW(AR_PFS)+16+(off); .spillsp ar.lc,SW(AR_LC)+16+(off); \
  60        .spillsp @priunat,SW(AR_UNAT)+16+(off);                                 \
  61        .spillsp ar.rnat,SW(AR_RNAT)+16+(off);                                  \
  62        .spillsp ar.bspstore,SW(AR_BSPSTORE)+16+(off);                          \
  63        .spillsp pr,SW(PR)+16+(off)
  64
  65#define DO_SAVE_SWITCH_STACK                    \
  66        movl r28=1f;                            \
  67        ;;                                      \
  68        .fframe IA64_SWITCH_STACK_SIZE;         \
  69        adds sp=-IA64_SWITCH_STACK_SIZE,sp;     \
  70        mov.ret.sptk b7=r28,1f;                 \
  71        SWITCH_STACK_SAVES(0);                  \
  72        br.cond.sptk.many save_switch_stack;    \
  731:
  74
  75#define DO_LOAD_SWITCH_STACK                    \
  76        movl r28=1f;                            \
  77        ;;                                      \
  78        invala;                                 \
  79        mov.ret.sptk b7=r28,1f;                 \
  80        br.cond.sptk.many load_switch_stack;    \
  811:      .restore sp;                            \
  82        adds sp=IA64_SWITCH_STACK_SIZE,sp
  83