root/arch/c6x/kernel/switch_to.S

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  *  Copyright (C) 2011 Texas Instruments Incorporated
   4  *  Author: Mark Salter (msalter@redhat.com)
   5  */
   6 
   7 #include <linux/linkage.h>
   8 #include <asm/asm-offsets.h>
   9 
  10 #define SP      B15
  11 
  12         /*
  13          * void __switch_to(struct thread_info *prev,
  14          *                  struct thread_info *next,
  15          *                  struct task_struct *tsk) ;
  16          */
  17 ENTRY(__switch_to)
  18         LDDW    .D2T2   *+B4(THREAD_B15_14),B7:B6
  19  ||     MV      .L2X    A4,B5   ; prev
  20  ||     MV      .L1X    B4,A5   ; next
  21  ||     MVC     .S2     RILC,B1
  22 
  23         STW     .D2T2   B3,*+B5(THREAD_PC)
  24  ||     STDW    .D1T1   A13:A12,*+A4(THREAD_A13_12)
  25  ||     MVC     .S2     ILC,B0
  26 
  27         LDW     .D2T2   *+B4(THREAD_PC),B3
  28  ||     LDDW    .D1T1   *+A5(THREAD_A13_12),A13:A12
  29 
  30         STDW    .D1T1   A11:A10,*+A4(THREAD_A11_10)
  31  ||     STDW    .D2T2   B1:B0,*+B5(THREAD_RICL_ICL)
  32 #ifndef __DSBT__
  33  ||     MVKL    .S2     current_ksp,B1
  34 #endif
  35 
  36         STDW    .D2T2   B15:B14,*+B5(THREAD_B15_14)
  37  ||     STDW    .D1T1   A15:A14,*+A4(THREAD_A15_14)
  38 #ifndef __DSBT__
  39  ||     MVKH    .S2     current_ksp,B1
  40 #endif
  41 
  42         ;; Switch to next SP
  43         MV      .S2     B7,SP
  44 #ifdef __DSBT__
  45  ||     STW     .D2T2   B7,*+B14(current_ksp)
  46 #else
  47  ||     STW     .D2T2   B7,*B1
  48  ||     MV      .L2     B6,B14
  49 #endif
  50  ||     LDDW    .D1T1   *+A5(THREAD_RICL_ICL),A1:A0
  51 
  52         STDW    .D2T2   B11:B10,*+B5(THREAD_B11_10)
  53  ||     LDDW    .D1T1   *+A5(THREAD_A15_14),A15:A14
  54 
  55         STDW    .D2T2   B13:B12,*+B5(THREAD_B13_12)
  56  ||     LDDW    .D1T1   *+A5(THREAD_A11_10),A11:A10
  57 
  58         B       .S2     B3              ; return in next E1
  59  ||     LDDW    .D2T2   *+B4(THREAD_B13_12),B13:B12
  60 
  61         LDDW    .D2T2   *+B4(THREAD_B11_10),B11:B10
  62         NOP
  63 
  64         MV      .L2X    A0,B0
  65  ||     MV      .S1     A6,A4
  66 
  67         MVC     .S2     B0,ILC
  68  ||     MV      .L2X    A1,B1
  69 
  70         MVC     .S2     B1,RILC
  71 ENDPROC(__switch_to)