root/arch/ia64/kernel/entry.h

INCLUDED FROM

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 
   3 /*
   4  * Preserved registers that are shared between code in ivt.S and
   5  * entry.S.  Be careful not to step on these!
   6  */
   7 #define PRED_LEAVE_SYSCALL      1 /* TRUE iff leave from syscall */
   8 #define PRED_KERNEL_STACK       2 /* returning to kernel-stacks? */
   9 #define PRED_USER_STACK         3 /* returning to user-stacks? */
  10 #define PRED_SYSCALL            4 /* inside a system call? */
  11 #define PRED_NON_SYSCALL        5 /* complement of PRED_SYSCALL */
  12 
  13 #ifdef __ASSEMBLY__
  14 # define PASTE2(x,y)    x##y
  15 # define PASTE(x,y)     PASTE2(x,y)
  16 
  17 # define pLvSys         PASTE(p,PRED_LEAVE_SYSCALL)
  18 # define pKStk          PASTE(p,PRED_KERNEL_STACK)
  19 # define pUStk          PASTE(p,PRED_USER_STACK)
  20 # define pSys           PASTE(p,PRED_SYSCALL)
  21 # define pNonSys        PASTE(p,PRED_NON_SYSCALL)
  22 #endif
  23 
  24 #define PT(f)           (IA64_PT_REGS_##f##_OFFSET)
  25 #define SW(f)           (IA64_SWITCH_STACK_##f##_OFFSET)
  26 #define SOS(f)          (IA64_SAL_OS_STATE_##f##_OFFSET)
  27 
  28 #define PT_REGS_SAVES(off)                      \
  29         .unwabi 3, 'i';                         \
  30         .fframe IA64_PT_REGS_SIZE+16+(off);     \
  31         .spillsp rp, PT(CR_IIP)+16+(off);       \
  32         .spillsp ar.pfs, PT(CR_IFS)+16+(off);   \
  33         .spillsp ar.unat, PT(AR_UNAT)+16+(off); \
  34         .spillsp ar.fpsr, PT(AR_FPSR)+16+(off); \
  35         .spillsp pr, PT(PR)+16+(off);
  36 
  37 #define PT_REGS_UNWIND_INFO(off)                \
  38         .prologue;                              \
  39         PT_REGS_SAVES(off);                     \
  40         .body
  41 
  42 #define SWITCH_STACK_SAVES(off)                                                 \
  43         .savesp ar.unat,SW(CALLER_UNAT)+16+(off);                               \
  44         .savesp ar.fpsr,SW(AR_FPSR)+16+(off);                                   \
  45         .spillsp f2,SW(F2)+16+(off); .spillsp f3,SW(F3)+16+(off);               \
  46         .spillsp f4,SW(F4)+16+(off); .spillsp f5,SW(F5)+16+(off);               \
  47         .spillsp f16,SW(F16)+16+(off); .spillsp f17,SW(F17)+16+(off);           \
  48         .spillsp f18,SW(F18)+16+(off); .spillsp f19,SW(F19)+16+(off);           \
  49         .spillsp f20,SW(F20)+16+(off); .spillsp f21,SW(F21)+16+(off);           \
  50         .spillsp f22,SW(F22)+16+(off); .spillsp f23,SW(F23)+16+(off);           \
  51         .spillsp f24,SW(F24)+16+(off); .spillsp f25,SW(F25)+16+(off);           \
  52         .spillsp f26,SW(F26)+16+(off); .spillsp f27,SW(F27)+16+(off);           \
  53         .spillsp f28,SW(F28)+16+(off); .spillsp f29,SW(F29)+16+(off);           \
  54         .spillsp f30,SW(F30)+16+(off); .spillsp f31,SW(F31)+16+(off);           \
  55         .spillsp r4,SW(R4)+16+(off); .spillsp r5,SW(R5)+16+(off);               \
  56         .spillsp r6,SW(R6)+16+(off); .spillsp r7,SW(R7)+16+(off);               \
  57         .spillsp b0,SW(B0)+16+(off); .spillsp b1,SW(B1)+16+(off);               \
  58         .spillsp b2,SW(B2)+16+(off); .spillsp b3,SW(B3)+16+(off);               \
  59         .spillsp b4,SW(B4)+16+(off); .spillsp b5,SW(B5)+16+(off);               \
  60         .spillsp ar.pfs,SW(AR_PFS)+16+(off); .spillsp ar.lc,SW(AR_LC)+16+(off); \
  61         .spillsp @priunat,SW(AR_UNAT)+16+(off);                                 \
  62         .spillsp ar.rnat,SW(AR_RNAT)+16+(off);                                  \
  63         .spillsp ar.bspstore,SW(AR_BSPSTORE)+16+(off);                          \
  64         .spillsp pr,SW(PR)+16+(off)
  65 
  66 #define DO_SAVE_SWITCH_STACK                    \
  67         movl r28=1f;                            \
  68         ;;                                      \
  69         .fframe IA64_SWITCH_STACK_SIZE;         \
  70         adds sp=-IA64_SWITCH_STACK_SIZE,sp;     \
  71         mov.ret.sptk b7=r28,1f;                 \
  72         SWITCH_STACK_SAVES(0);                  \
  73         br.cond.sptk.many save_switch_stack;    \
  74 1:
  75 
  76 #define DO_LOAD_SWITCH_STACK                    \
  77         movl r28=1f;                            \
  78         ;;                                      \
  79         invala;                                 \
  80         mov.ret.sptk b7=r28,1f;                 \
  81         br.cond.sptk.many load_switch_stack;    \
  82 1:      .restore sp;                            \
  83         adds sp=IA64_SWITCH_STACK_SIZE,sp