2 #ifndef __ASM_ARC_ENTRY_ARCV2_H
3 #define __ASM_ARC_ENTRY_ARCV2_H
5 #include <asm/asm-offsets.h>
6 #include <asm/irqflags-arcv2.h>
7 #include <asm/thread_info.h> /* For THREAD_SIZE */
9 /*------------------------------------------------------------------------*/
10 .macro INTERRUPT_PROLOGUE called_from
12 ; Before jumping to Interrupt Vector, hardware micro-ops did following:
13 ; 1. SP auto-switched to kernel mode stack
14 ; 2. STATUS32.Z flag set to U mode at time of interrupt (U:1, K:0)
15 ; 3. Auto saved: r0-r11, blink, LPE,LPS,LPC, JLI,LDI,EI, PC, STAT32
17 ; Now manually save: r12, sp, fp, gp, r25
21 ; Saving pt_regs->sp correctly requires some extra work due to the way
22 ; Auto stack switch works
23 ; - U mode: retrieve it from AUX_USER_SP
24 ; - K mode: add the offset from current SP where H/w starts auto push
26 ; Utilize the fact that Z bit is set if Intr taken in U mode
28 add.nz r9, r9, SZ_PT_REGS - PT_sp - 4
38 #ifdef CONFIG_ARC_CURR_IN_REG
40 GET_CURR_TASK_ON_CPU r25
45 .ifnc \called_from, exception
46 sub sp, sp, 12 ; BTA/ECR/orig_r0 placeholder per pt_regs
51 /*------------------------------------------------------------------------*/
52 .macro INTERRUPT_EPILOGUE called_from
54 .ifnc \called_from, exception
55 add sp, sp, 12 ; skip BTA/ECR/orig_r0 placeholderss
58 #ifdef CONFIG_ARC_CURR_IN_REG
67 ; Don't touch AUX_USER_SP if returning to K mode (Z bit set)
68 ; (Z bit set on K mode is inverse of INTERRUPT_PROLOGUE)
78 /*------------------------------------------------------------------------*/
79 .macro EXCEPTION_PROLOGUE
81 ; Before jumping to Exception Vector, hardware micro-ops did following:
82 ; 1. SP auto-switched to kernel mode stack
83 ; 2. STATUS32.Z flag set to U mode at time of interrupt (U:1,K:0)
85 ; Now manually save the complete reg file
87 PUSH r9 ; freeup a register: slot of erstatus
90 sub sp, sp, 12 ; skip JLI, LDI, EI
99 ld.as r9, [sp, 10] ; load stashed r9 (status32 stack slot)
101 st.as r10, [sp, 10] ; save status32 at it's right stack slot
114 ; -- for interrupts, regs above are auto-saved by h/w in that order --
115 ; Now do what ISR prologue does (manually save r12, sp, fp, gp, r25)
117 ; Set Z flag if this was from U mode (expected by INTERRUPT_PROLOGUE)
118 ; Although H/w exception micro-ops do set Z flag for U mode (just like
119 ; for interrupts), it could get clobbered in case we soft land here from
120 ; a TLB Miss exception handler (tlbex.S)
122 and r10, r10, STATUS_U_MASK
123 xor.f 0, r10, STATUS_U_MASK
125 INTERRUPT_PROLOGUE exception
128 PUSHAX ecr ; r9 contains ECR, expected by EV_Trap
133 /*------------------------------------------------------------------------*/
134 .macro EXCEPTION_EPILOGUE
136 ; Assumes r0 has PT_status32
137 btst r0, STATUS_U_BIT ; Z flag set if K, used in INTERRUPT_EPILOGUE
139 add sp, sp, 8 ; orig_r0/ECR don't need restoring
142 INTERRUPT_EPILOGUE exception
164 add sp, sp, 12 ; skip JLI, LDI, EI
168 ld.as r9, [sp, -12] ; reload r9 which got clobbered
171 .macro FAKE_RET_FROM_EXCPN
173 bic r9, r9, (STATUS_U_MASK|STATUS_DE_MASK|STATUS_AE_MASK)
174 or r9, r9, (STATUS_L_MASK|STATUS_IE_MASK)
178 /* Get thread_info of "current" tsk */
179 .macro GET_CURR_THR_INFO_FROM_SP reg
180 bmskn \reg, sp, THREAD_SHIFT - 1
183 /* Get CPU-ID of this core */
184 .macro GET_CPU_ID reg
186 xbfu \reg, \reg, 0xE8 /* 00111 01000 */