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/*
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Vineetg: Aug 28th 2008: Bug #94984
* -Zero Overhead Loop Context shd be cleared when entering IRQ/EXcp/Trap
* Normally CPU does this automatically, however when doing FAKE rtie,
* we also need to explicitly do this. The problem in macros
* FAKE_RET_FROM_EXCPN and FAKE_RET_FROM_EXCPN_LOCK_IRQ was that this bit
* was being "CLEARED" rather then "SET". Actually "SET" clears ZOL context
*
* Vineetg: May 5th 2008
* - Defined Stack Switching Macro to be reused in all intr/excp hdlrs
* - Shaved off 11 instructions from RESTORE_ALL_INT1 by using the
* address Write back load ld.ab instead of seperate ld/add instn
*
* Amit Bhor, Sameer Dhavale: Codito Technologies 2004
*/
#ifndef __ASM_ARC_ENTRY_H
#define __ASM_ARC_ENTRY_H
#ifdef __ASSEMBLY__
#include <asm/unistd.h> /* For NR_syscalls defination */
#include <asm/asm-offsets.h>
#include <asm/arcregs.h>
#include <asm/ptrace.h>
#include <asm/thread_info.h> /* For THREAD_SIZE */
/* Note on the LD/ST addr modes with addr reg wback
*
* LD.a same as LD.aw
*
* LD.a reg1, [reg2, x] => Pre Incr
* Eff Addr for load = [reg2 + x]
*
* LD.ab reg1, [reg2, x] => Post Incr
* Eff Addr for load = [reg2]
*/
/*--------------------------------------------------------------
* Save caller saved registers (scratch registers) ( r0 - r12 )
* Registers are pushed / popped in the order defined in struct ptregs
* in asm/ptrace.h
*-------------------------------------------------------------*/
.macro SAVE_CALLER_SAVED
st.a r0, [sp, -4]
st.a r1, [sp, -4]
st.a r2, [sp, -4]
st.a r3, [sp, -4]
st.a r4, [sp, -4]
st.a r5, [sp, -4]
st.a r6, [sp, -4]
st.a r7, [sp, -4]
st.a r8, [sp, -4]
st.a r9, [sp, -4]
st.a r10, [sp, -4]
st.a r11, [sp, -4]
st.a r12, [sp, -4]
.endm
/*--------------------------------------------------------------
* Restore caller saved registers (scratch registers)
*-------------------------------------------------------------*/
.macro RESTORE_CALLER_SAVED
ld.ab r12, [sp, 4]
ld.ab r11, [sp, 4]
ld.ab r10, [sp, 4]
ld.ab r9, [sp, 4]
ld.ab r8, [sp, 4]
ld.ab r7, [sp, 4]
ld.ab r6, [sp, 4]
ld.ab r5, [sp, 4]
ld.ab r4, [sp, 4]
ld.ab r3, [sp, 4]
ld.ab r2, [sp, 4]
ld.ab r1, [sp, 4]
ld.ab r0, [sp, 4]
.endm
/*--------------------------------------------------------------
* Save callee saved registers (non scratch registers) ( r13 - r25 )
* on kernel stack.
* User mode callee regs need to be saved in case of
* -fork and friends for replicating from parent to child
* -before going into do_signal( ) for ptrace/core-dump
* Special case handling is required for r25 in case it is used by kernel
* for caching task ptr. Low level exception/ISR save user mode r25
* into task->thread.user_r25. So it needs to be retrieved from there and
* saved into kernel stack with rest of callee reg-file
*-------------------------------------------------------------*/
.macro SAVE_CALLEE_SAVED_USER
st.a r13, [sp, -4]
st.a r14, [sp, -4]
st.a r15, [sp, -4]
st.a r16, [sp, -4]
st.a r17, [sp, -4]
st.a r18, [sp, -4]
st.a r19, [sp, -4]
st.a r20, [sp, -4]
st.a r21, [sp, -4]
st.a r22, [sp, -4]
st.a r23, [sp, -4]
st.a r24, [sp, -4]
st.a r25, [sp, -4]
/* move up by 1 word to "create" callee_regs->"stack_place_holder" */
sub sp, sp, 4
.endm
/*--------------------------------------------------------------
* Save callee saved registers (non scratch registers) ( r13 - r25 )
* kernel mode callee regs needed to be saved in case of context switch
* If r25 is used for caching task pointer then that need not be saved
* as it can be re-created from current task global
*-------------------------------------------------------------*/
.macro SAVE_CALLEE_SAVED_KERNEL
st.a r13, [sp, -4]
st.a r14, [sp, -4]
st.a r15, [sp, -4]
st.a r16, [sp, -4]
st.a r17, [sp, -4]
st.a r18, [sp, -4]
st.a r19, [sp, -4]
st.a r20, [sp, -4]
st.a r21, [sp, -4]
st.a r22, [sp, -4]
st.a r23, [sp, -4]
st.a r24, [sp, -4]
st.a r25, [sp, -4]
sub sp, sp, 4
.endm
/*--------------------------------------------------------------
* RESTORE_CALLEE_SAVED_KERNEL:
* Loads callee (non scratch) Reg File by popping from Kernel mode stack.
* This is reverse of SAVE_CALLEE_SAVED,
*
* NOTE:
* Ideally this shd only be called in switch_to for loading
* switched-IN task's CALLEE Reg File.
* For all other cases RESTORE_CALLEE_SAVED_FAST must be used
* which simply pops the stack w/o touching regs.
*-------------------------------------------------------------*/
.macro RESTORE_CALLEE_SAVED_KERNEL
add sp, sp, 4 /* skip "callee_regs->stack_place_holder" */
ld.ab r25, [sp, 4]
ld.ab r24, [sp, 4]
ld.ab r23, [sp, 4]
ld.ab r22, [sp, 4]
ld.ab r21, [sp, 4]
ld.ab r20, [sp, 4]
ld.ab r19, [sp, 4]
ld.ab r18, [sp, 4]
ld.ab r17, [sp, 4]
ld.ab r16, [sp, 4]
ld.ab r15, [sp, 4]
ld.ab r14, [sp, 4]
ld.ab r13, [sp, 4]
.endm
/*--------------------------------------------------------------
* RESTORE_CALLEE_SAVED_USER:
* This is called after do_signal where tracer might have changed callee regs
* thus we need to restore the reg file.
* Special case handling is required for r25 in case it is used by kernel
* for caching task ptr. Ptrace would have modified on-kernel-stack value of
* r25, which needs to be shoved back into task->thread.user_r25 where from
* Low level exception/ISR return code will retrieve to populate with rest of
* callee reg-file.
*-------------------------------------------------------------*/
.macro RESTORE_CALLEE_SAVED_USER
add sp, sp, 4 /* skip "callee_regs->stack_place_holder" */
#ifdef CONFIG_ARC_CURR_IN_REG
ld.ab r12, [sp, 4]
st r12, [r25, TASK_THREAD + THREAD_USER_R25]
#else
ld.ab r25, [sp, 4]
#endif
ld.ab r24, [sp, 4]
ld.ab r23, [sp, 4]
ld.ab r22, [sp, 4]
ld.ab r21, [sp, 4]
ld.ab r20, [sp, 4]
ld.ab r19, [sp, 4]
ld.ab r18, [sp, 4]
ld.ab r17, [sp, 4]
ld.ab r16, [sp, 4]
ld.ab r15, [sp, 4]
ld.ab r14, [sp, 4]
ld.ab r13, [sp, 4]
.endm
/*--------------------------------------------------------------
* Super FAST Restore callee saved regs by simply re-adjusting SP
*-------------------------------------------------------------*/
.macro DISCARD_CALLEE_SAVED_USER
add sp, sp, 14 * 4
.endm
/*--------------------------------------------------------------
* Restore User mode r25 saved in task_struct->thread.user_r25
*-------------------------------------------------------------*/
.macro RESTORE_USER_R25
ld r25, [r25, TASK_THREAD + THREAD_USER_R25]
.endm
/*-------------------------------------------------------------
* given a tsk struct, get to the base of it's kernel mode stack
* tsk->thread_info is really a PAGE, whose bottom hoists stack
* which grows upwards towards thread_info
*------------------------------------------------------------*/
.macro GET_TSK_STACK_BASE tsk, out
/* Get task->thread_info (this is essentially start of a PAGE) */
ld \out, [\tsk, TASK_THREAD_INFO]
/* Go to end of page where stack begins (grows upwards) */
add2 \out, \out, (THREAD_SIZE - 4)/4 /* one word GUTTER */
.endm
/*--------------------------------------------------------------
* Switch to Kernel Mode stack if SP points to User Mode stack
*
* Entry : r9 contains pre-IRQ/exception/trap status32
* Exit : SP is set to kernel mode stack pointer
* Clobbers: r9
*-------------------------------------------------------------*/
.macro SWITCH_TO_KERNEL_STK
/* User Mode when this happened ? Yes: Proceed to switch stack */
bbit1 r9, STATUS_U_BIT, 88f
/* OK we were already in kernel mode when this event happened, thus can
* assume SP is kernel mode SP. _NO_ need to do any stack switching
*/
/* Save Pre Intr/Exception KERNEL MODE SP on kernel stack
* safe-keeping not really needed, but it keeps the epilogue code
* (SP restore) simpler/uniform.
*/
b.d 77f
st.a sp, [sp, -12] ; Make room for orig_r0 and orig_r8
88: /*------Intr/Ecxp happened in user mode, "switch" stack ------ */
GET_CURR_TASK_ON_CPU r9
/* With current tsk in r9, get it's kernel mode stack base */
GET_TSK_STACK_BASE r9, r9
#ifdef PT_REGS_CANARY
st 0xabcdabcd, [r9, 0]
#endif
/* Save Pre Intr/Exception User SP on kernel stack */
st.a sp, [r9, -12] ; Make room for orig_r0 and orig_r8
/* CAUTION:
* SP should be set at the very end when we are done with everything
* In case of 2 levels of interrupt we depend on value of SP to assume
* that everything else is done (loading r25 etc)
*/
/* set SP to point to kernel mode stack */
mov sp, r9
77: /* ----- Stack Switched to kernel Mode, Now save REG FILE ----- */
.endm
/*------------------------------------------------------------
* "FAKE" a rtie to return from CPU Exception context
* This is to re-enable Exceptions within exception
* Look at EV_ProtV to see how this is actually used
*-------------------------------------------------------------*/
.macro FAKE_RET_FROM_EXCPN reg
ld \reg, [sp, PT_status32]
bic \reg, \reg, (STATUS_U_MASK|STATUS_DE_MASK)
bset \reg, \reg, STATUS_L_BIT
sr \reg, [erstatus]
mov \reg, 55f
sr \reg, [eret]
rtie
55:
.endm
/*
* @reg [OUT] &thread_info of "current"
*/
.macro GET_CURR_THR_INFO_FROM_SP reg
and \reg, sp, ~(THREAD_SIZE - 1)
.endm
/*
* @reg [OUT] thread_info->flags of "current"
*/
.macro GET_CURR_THR_INFO_FLAGS reg
GET_CURR_THR_INFO_FROM_SP \reg
ld \reg, [\reg, THREAD_INFO_FLAGS]
.endm
/*--------------------------------------------------------------
* For early Exception Prologue, a core reg is temporarily needed to
* code the rest of prolog (stack switching). This is done by stashing
* it to memory (non-SMP case) or SCRATCH0 Aux Reg (SMP).
*
* Before saving the full regfile - this reg is restored back, only
* to be saved again on kernel mode stack, as part of ptregs.
*-------------------------------------------------------------*/
.macro EXCPN_PROLOG_FREEUP_REG reg
st \reg, [@ex_saved_reg1]
.endm
.macro EXCPN_PROLOG_RESTORE_REG reg
ld \reg, [@ex_saved_reg1]
.endm
/*--------------------------------------------------------------
* Save all registers used by Exceptions (TLB Miss, Prot-V, Mem err etc)
* Requires SP to be already switched to kernel mode Stack
* sp points to the next free element on the stack at exit of this macro.
* Registers are pushed / popped in the order defined in struct ptregs
* in asm/ptrace.h
* Note that syscalls are implemented via TRAP which is also a exception
* from CPU's point of view
*-------------------------------------------------------------*/
.macro SAVE_ALL_EXCEPTION marker
st \marker, [sp, 8]
st r0, [sp, 4] /* orig_r0, needed only for sys calls */
/* Restore r9 used to code the early prologue */
EXCPN_PROLOG_RESTORE_REG r9
SAVE_CALLER_SAVED
st.a r26, [sp, -4] /* gp */
st.a fp, [sp, -4]
st.a blink, [sp, -4]
lr r9, [eret]
st.a r9, [sp, -4]
lr r9, [erstatus]
st.a r9, [sp, -4]
st.a lp_count, [sp, -4]
lr r9, [lp_end]
st.a r9, [sp, -4]
lr r9, [lp_start]
st.a r9, [sp, -4]
lr r9, [erbta]
st.a r9, [sp, -4]
#ifdef PT_REGS_CANARY
mov r9, 0xdeadbeef
st r9, [sp, -4]
#endif
/* move up by 1 word to "create" pt_regs->"stack_place_holder" */
sub sp, sp, 4
.endm
/*--------------------------------------------------------------
* Save scratch regs for exceptions
*-------------------------------------------------------------*/
.macro SAVE_ALL_SYS
SAVE_ALL_EXCEPTION orig_r8_IS_EXCPN
.endm
/*--------------------------------------------------------------
* Save scratch regs for sys calls
*-------------------------------------------------------------*/
.macro SAVE_ALL_TRAP
/*
* Setup pt_regs->orig_r8.
* Encode syscall number (r8) in upper short word of event type (r9)
* N.B. #1: This is already endian safe (see ptrace.h)
* #2: Only r9 can be used as scratch as it is already clobbered
* and it's contents are no longer needed by the latter part
* of exception prologue
*/
lsl r9, r8, 16
or r9, r9, orig_r8_IS_SCALL
SAVE_ALL_EXCEPTION r9
.endm
/*--------------------------------------------------------------
* Restore all registers used by system call or Exceptions
* SP should always be pointing to the next free stack element
* when entering this macro.
*
* NOTE:
*
* It is recommended that lp_count/ilink1/ilink2 not be used as a dest reg
* for memory load operations. If used in that way interrupts are deffered
* by hardware and that is not good.
*-------------------------------------------------------------*/
.macro RESTORE_ALL_SYS
add sp, sp, 4 /* hop over unused "pt_regs->stack_place_holder" */
ld.ab r9, [sp, 4]
sr r9, [erbta]
ld.ab r9, [sp, 4]
sr r9, [lp_start]
ld.ab r9, [sp, 4]
sr r9, [lp_end]
ld.ab r9, [sp, 4]
mov lp_count, r9
ld.ab r9, [sp, 4]
sr r9, [erstatus]
ld.ab r9, [sp, 4]
sr r9, [eret]
ld.ab blink, [sp, 4]
ld.ab fp, [sp, 4]
ld.ab r26, [sp, 4] /* gp */
RESTORE_CALLER_SAVED
ld sp, [sp] /* restore original sp */
/* orig_r0 and orig_r8 skipped automatically */
.endm
/*--------------------------------------------------------------
* Save all registers used by interrupt handlers.
*-------------------------------------------------------------*/
.macro SAVE_ALL_INT1
/* restore original r9 , saved in int1_saved_reg
* It will be saved on stack in macro: SAVE_CALLER_SAVED
*/
ld r9, [@int1_saved_reg]
/* now we are ready to save the remaining context :) */
st orig_r8_IS_IRQ1, [sp, 8] /* Event Type */
st 0, [sp, 4] /* orig_r0 , N/A for IRQ */
SAVE_CALLER_SAVED
st.a r26, [sp, -4] /* gp */
st.a fp, [sp, -4]
st.a blink, [sp, -4]
st.a ilink1, [sp, -4]
lr r9, [status32_l1]
st.a r9, [sp, -4]
st.a lp_count, [sp, -4]
lr r9, [lp_end]
st.a r9, [sp, -4]
lr r9, [lp_start]
st.a r9, [sp, -4]
lr r9, [bta_l1]
st.a r9, [sp, -4]
#ifdef PT_REGS_CANARY
mov r9, 0xdeadbee1
st r9, [sp, -4]
#endif
/* move up by 1 word to "create" pt_regs->"stack_place_holder" */
sub sp, sp, 4
.endm
/*--------------------------------------------------------------
* Restore all registers used by interrupt handlers.
*
* NOTE:
*
* It is recommended that lp_count/ilink1/ilink2 not be used as a dest reg
* for memory load operations. If used in that way interrupts are deffered
* by hardware and that is not good.
*-------------------------------------------------------------*/
.macro RESTORE_ALL_INT1
add sp, sp, 4 /* hop over unused "pt_regs->stack_place_holder" */
ld.ab r9, [sp, 4] /* Actual reg file */
sr r9, [bta_l1]
ld.ab r9, [sp, 4]
sr r9, [lp_start]
ld.ab r9, [sp, 4]
sr r9, [lp_end]
ld.ab r9, [sp, 4]
mov lp_count, r9
ld.ab r9, [sp, 4]
sr r9, [status32_l1]
ld.ab r9, [sp, 4]
mov ilink1, r9
ld.ab blink, [sp, 4]
ld.ab fp, [sp, 4]
ld.ab r26, [sp, 4] /* gp */
RESTORE_CALLER_SAVED
ld sp, [sp] /* restore original sp */
/* orig_r0 and orig_r8 skipped automatically */
.endm
/* Get CPU-ID of this core */
.macro GET_CPU_ID reg
lr \reg, [identity]
lsr \reg, \reg, 8
bmsk \reg, \reg, 7
.endm
.macro GET_CURR_TASK_ON_CPU reg
ld \reg, [@_current_task]
.endm
.macro SET_CURR_TASK_ON_CPU tsk, tmp
st \tsk, [@_current_task]
.endm
/* ------------------------------------------------------------------
* Get the ptr to some field of Current Task at @off in task struct
*/
.macro GET_CURR_TASK_FIELD_PTR off, reg
GET_CURR_TASK_ON_CPU \reg
add \reg, \reg, \off
.endm
#endif /* __ASSEMBLY__ */
#endif /* __ASM_ARC_ENTRY_H */
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