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| 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 */ |
| 55 |
Warning: This file is not a C or C++ file. It does not have highlighting.