/* 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_L_MASK|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
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Kbuild | File | 681 B | 0644 |
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arcregs.h | File | 8.59 KB | 0644 |
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asm-offsets.h | File | 311 B | 0644 |
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atomic.h | File | 15.14 KB | 0644 |
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barrier.h | File | 1.75 KB | 0644 |
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bitops.h | File | 9.81 KB | 0644 |
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bug.h | File | 938 B | 0644 |
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cache.h | File | 3.77 KB | 0644 |
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cacheflush.h | File | 3.88 KB | 0644 |
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checksum.h | File | 2.45 KB | 0644 |
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cmpxchg.h | File | 5.4 KB | 0644 |
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current.h | File | 695 B | 0644 |
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delay.h | File | 1.99 KB | 0644 |
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disasm.h | File | 3.87 KB | 0644 |
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dma-mapping.h | File | 734 B | 0644 |
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dma.h | File | 459 B | 0644 |
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dwarf.h | File | 892 B | 0644 |
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elf.h | File | 2.15 KB | 0644 |
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entry-arcv2.h | File | 4.85 KB | 0644 |
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entry-compact.h | File | 9.29 KB | 0644 |
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entry.h | File | 6.73 KB | 0644 |
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exec.h | File | 410 B | 0644 |
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fb.h | File | 411 B | 0644 |
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futex.h | File | 3.67 KB | 0644 |
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highmem.h | File | 1.46 KB | 0644 |
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hugepage.h | File | 2.41 KB | 0644 |
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io.h | File | 6.43 KB | 0644 |
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irq.h | File | 825 B | 0644 |
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irqflags-arcv2.h | File | 3.45 KB | 0644 |
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irqflags-compact.h | File | 4.25 KB | 0644 |
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irqflags.h | File | 509 B | 0644 |
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kdebug.h | File | 400 B | 0644 |
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kgdb.h | File | 1.35 KB | 0644 |
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kmap_types.h | File | 489 B | 0644 |
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kprobes.h | File | 1.37 KB | 0644 |
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linkage.h | File | 1.42 KB | 0644 |
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mach_desc.h | File | 2.06 KB | 0644 |
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mmu.h | File | 2.44 KB | 0644 |
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mmu_context.h | File | 5.67 KB | 0644 |
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mmzone.h | File | 989 B | 0644 |
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module.h | File | 661 B | 0644 |
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page.h | File | 2.99 KB | 0644 |
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pci.h | File | 705 B | 0644 |
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perf_event.h | File | 6.86 KB | 0644 |
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pgalloc.h | File | 3.79 KB | 0644 |
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pgtable.h | File | 14.2 KB | 0644 |
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processor.h | File | 4.69 KB | 0644 |
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ptrace.h | File | 3.87 KB | 0644 |
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sections.h | File | 407 B | 0644 |
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segment.h | File | 612 B | 0644 |
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serial.h | File | 644 B | 0644 |
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setup.h | File | 1.18 KB | 0644 |
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shmparam.h | File | 442 B | 0644 |
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smp.h | File | 4.25 KB | 0644 |
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spinlock.h | File | 8.79 KB | 0644 |
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spinlock_types.h | File | 1.03 KB | 0644 |
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stacktrace.h | File | 1.29 KB | 0644 |
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string.h | File | 1.15 KB | 0644 |
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switch_to.h | File | 1.17 KB | 0644 |
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syscall.h | File | 1.57 KB | 0644 |
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syscalls.h | File | 653 B | 0644 |
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thread_info.h | File | 3.39 KB | 0644 |
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timex.h | File | 508 B | 0644 |
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tlb-mmu1.h | File | 3.48 KB | 0644 |
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tlb.h | File | 1.23 KB | 0644 |
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tlbflush.h | File | 1.76 KB | 0644 |
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uaccess.h | File | 18.45 KB | 0644 |
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unaligned.h | File | 771 B | 0644 |
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unwind.h | File | 3.51 KB | 0644 |
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