| /* SPDX-License-Identifier: GPL-2.0 */ |
| |
| #ifndef __ASM_ARC_ENTRY_ARCV2_H |
| #define __ASM_ARC_ENTRY_ARCV2_H |
| |
| #include <asm/asm-offsets.h> |
| #include <asm/irqflags-arcv2.h> |
| #include <asm/thread_info.h> /* For THREAD_SIZE */ |
| |
| /*------------------------------------------------------------------------*/ |
| .macro INTERRUPT_PROLOGUE called_from |
| |
| ; Before jumping to Interrupt Vector, hardware micro-ops did following: |
| ; 1. SP auto-switched to kernel mode stack |
| ; 2. STATUS32.Z flag set to U mode at time of interrupt (U:1, K:0) |
| ; 3. Auto saved: r0-r11, blink, LPE,LPS,LPC, JLI,LDI,EI, PC, STAT32 |
| ; |
| ; Now manually save: r12, sp, fp, gp, r25 |
| |
| #ifdef CONFIG_ARC_IRQ_NO_AUTOSAVE |
| .ifnc \called_from, exception |
| st.as r9, [sp, -10] ; save r9 in it's final stack slot |
| sub sp, sp, 12 ; skip JLI, LDI, EI |
| |
| PUSH lp_count |
| PUSHAX lp_start |
| PUSHAX lp_end |
| PUSH blink |
| |
| PUSH r11 |
| PUSH r10 |
| |
| sub sp, sp, 4 ; skip r9 |
| |
| PUSH r8 |
| PUSH r7 |
| PUSH r6 |
| PUSH r5 |
| PUSH r4 |
| PUSH r3 |
| PUSH r2 |
| PUSH r1 |
| PUSH r0 |
| .endif |
| #endif |
| |
| #ifdef CONFIG_ARC_HAS_ACCL_REGS |
| PUSH r59 |
| PUSH r58 |
| #endif |
| |
| PUSH r30 |
| PUSH r12 |
| |
| ; Saving pt_regs->sp correctly requires some extra work due to the way |
| ; Auto stack switch works |
| ; - U mode: retrieve it from AUX_USER_SP |
| ; - K mode: add the offset from current SP where H/w starts auto push |
| ; |
| ; Utilize the fact that Z bit is set if Intr taken in U mode |
| mov.nz r9, sp |
| add.nz r9, r9, SZ_PT_REGS - PT_sp - 4 |
| bnz 1f |
| |
| lr r9, [AUX_USER_SP] |
| 1: |
| PUSH r9 ; SP |
| |
| PUSH fp |
| PUSH gp |
| |
| #ifdef CONFIG_ARC_CURR_IN_REG |
| PUSH r25 ; user_r25 |
| GET_CURR_TASK_ON_CPU r25 |
| #else |
| sub sp, sp, 4 |
| #endif |
| |
| .ifnc \called_from, exception |
| sub sp, sp, 12 ; BTA/ECR/orig_r0 placeholder per pt_regs |
| .endif |
| |
| .endm |
| |
| /*------------------------------------------------------------------------*/ |
| .macro INTERRUPT_EPILOGUE called_from |
| |
| .ifnc \called_from, exception |
| add sp, sp, 12 ; skip BTA/ECR/orig_r0 placeholderss |
| .endif |
| |
| #ifdef CONFIG_ARC_CURR_IN_REG |
| POP r25 |
| #else |
| add sp, sp, 4 |
| #endif |
| |
| POP gp |
| POP fp |
| |
| ; Don't touch AUX_USER_SP if returning to K mode (Z bit set) |
| ; (Z bit set on K mode is inverse of INTERRUPT_PROLOGUE) |
| add.z sp, sp, 4 |
| bz 1f |
| |
| POPAX AUX_USER_SP |
| 1: |
| POP r12 |
| POP r30 |
| |
| #ifdef CONFIG_ARC_HAS_ACCL_REGS |
| POP r58 |
| POP r59 |
| #endif |
| |
| #ifdef CONFIG_ARC_IRQ_NO_AUTOSAVE |
| .ifnc \called_from, exception |
| POP r0 |
| POP r1 |
| POP r2 |
| POP r3 |
| POP r4 |
| POP r5 |
| POP r6 |
| POP r7 |
| POP r8 |
| POP r9 |
| POP r10 |
| POP r11 |
| |
| POP blink |
| POPAX lp_end |
| POPAX lp_start |
| |
| POP r9 |
| mov lp_count, r9 |
| |
| add sp, sp, 12 ; skip JLI, LDI, EI |
| ld.as r9, [sp, -10] ; reload r9 which got clobbered |
| .endif |
| #endif |
| |
| .endm |
| |
| /*------------------------------------------------------------------------*/ |
| .macro EXCEPTION_PROLOGUE |
| |
| ; Before jumping to Exception Vector, hardware micro-ops did following: |
| ; 1. SP auto-switched to kernel mode stack |
| ; 2. STATUS32.Z flag set to U mode at time of interrupt (U:1,K:0) |
| ; |
| ; Now manually save the complete reg file |
| |
| PUSH r9 ; freeup a register: slot of erstatus |
| |
| PUSHAX eret |
| sub sp, sp, 12 ; skip JLI, LDI, EI |
| PUSH lp_count |
| PUSHAX lp_start |
| PUSHAX lp_end |
| PUSH blink |
| |
| PUSH r11 |
| PUSH r10 |
| |
| ld.as r9, [sp, 10] ; load stashed r9 (status32 stack slot) |
| lr r10, [erstatus] |
| st.as r10, [sp, 10] ; save status32 at it's right stack slot |
| |
| PUSH r9 |
| PUSH r8 |
| PUSH r7 |
| PUSH r6 |
| PUSH r5 |
| PUSH r4 |
| PUSH r3 |
| PUSH r2 |
| PUSH r1 |
| PUSH r0 |
| |
| ; -- for interrupts, regs above are auto-saved by h/w in that order -- |
| ; Now do what ISR prologue does (manually save r12, sp, fp, gp, r25) |
| ; |
| ; Set Z flag if this was from U mode (expected by INTERRUPT_PROLOGUE) |
| ; Although H/w exception micro-ops do set Z flag for U mode (just like |
| ; for interrupts), it could get clobbered in case we soft land here from |
| ; a TLB Miss exception handler (tlbex.S) |
| |
| and r10, r10, STATUS_U_MASK |
| xor.f 0, r10, STATUS_U_MASK |
| |
| INTERRUPT_PROLOGUE exception |
| |
| PUSHAX erbta |
| PUSHAX ecr ; r9 contains ECR, expected by EV_Trap |
| |
| PUSH r0 ; orig_r0 |
| .endm |
| |
| /*------------------------------------------------------------------------*/ |
| .macro EXCEPTION_EPILOGUE |
| |
| ; Assumes r0 has PT_status32 |
| btst r0, STATUS_U_BIT ; Z flag set if K, used in INTERRUPT_EPILOGUE |
| |
| add sp, sp, 8 ; orig_r0/ECR don't need restoring |
| POPAX erbta |
| |
| INTERRUPT_EPILOGUE exception |
| |
| POP r0 |
| POP r1 |
| POP r2 |
| POP r3 |
| POP r4 |
| POP r5 |
| POP r6 |
| POP r7 |
| POP r8 |
| POP r9 |
| POP r10 |
| POP r11 |
| |
| POP blink |
| POPAX lp_end |
| POPAX lp_start |
| |
| POP r9 |
| mov lp_count, r9 |
| |
| add sp, sp, 12 ; skip JLI, LDI, EI |
| POPAX eret |
| POPAX erstatus |
| |
| ld.as r9, [sp, -12] ; reload r9 which got clobbered |
| .endm |
| |
| .macro FAKE_RET_FROM_EXCPN |
| lr r9, [status32] |
| bic r9, r9, (STATUS_U_MASK|STATUS_DE_MASK|STATUS_AE_MASK) |
| or r9, r9, STATUS_IE_MASK |
| kflag r9 |
| .endm |
| |
| /* Get thread_info of "current" tsk */ |
| .macro GET_CURR_THR_INFO_FROM_SP reg |
| bmskn \reg, sp, THREAD_SHIFT - 1 |
| .endm |
| |
| /* Get CPU-ID of this core */ |
| .macro GET_CPU_ID reg |
| lr \reg, [identity] |
| xbfu \reg, \reg, 0xE8 /* 00111 01000 */ |
| /* M = 8-1 N = 8 */ |
| .endm |
| |
| #endif |