arch/riscv/include/asm/scs.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_SCS_H
   3 #define _ASM_SCS_H
   4
   5 #ifdef __ASSEMBLY__
   6 #include <asm/asm-offsets.h>
   7
   8 #ifdef CONFIG_SHADOW_CALL_STACK
   9
  10 /* Load init_shadow_call_stack to gp. */
  11 .macro scs_load_init_stack
  12         la      gp, init_shadow_call_stack
  13         XIP_FIXUP_OFFSET gp
  14 .endm
  15
  16 /* Load the per-CPU IRQ shadow call stack to gp. */
  17 .macro scs_load_irq_stack tmp
  18         load_per_cpu gp, irq_shadow_call_stack_ptr, \tmp
  19 .endm
  20
  21 /* Load task_scs_sp(current) to gp. */
  22 .macro scs_load_current
  23         REG_L   gp, TASK_TI_SCS_SP(tp)
  24 .endm
  25
  26 /* Load task_scs_sp(current) to gp, but only if tp has changed. */
  27 .macro scs_load_current_if_task_changed prev
  28         beq     \prev, tp, _skip_scs
  29         scs_load_current
  30 _skip_scs:
  31 .endm
  32
  33 /* Save gp to task_scs_sp(current). */
  34 .macro scs_save_current
  35         REG_S   gp, TASK_TI_SCS_SP(tp)
  36 .endm
  37
  38 #else /* CONFIG_SHADOW_CALL_STACK */
  39
  40 .macro scs_load_init_stack
  41 .endm
  42 .macro scs_load_irq_stack tmp
  43 .endm
  44 .macro scs_load_current
  45 .endm
  46 .macro scs_load_current_if_task_changed prev
  47 .endm
  48 .macro scs_save_current
  49 .endm
  50
  51 #endif /* CONFIG_SHADOW_CALL_STACK */
  52 #endif /* __ASSEMBLY__ */
  53
  54 #endif /* _ASM_SCS_H */