122 lines
4.1 KiB
ArmAsm
122 lines
4.1 KiB
ArmAsm
/*
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* Copyright (c) 2011 Aeroflex Gaisler
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*
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* BSD license:
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <asm-leon/leonstack.h>
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#include <asm-leon/winmacros.h>
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/* Registers to not touch at all. */
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#define t_psr l0 /* Set by caller */
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#define t_pc l1 /* Set by caller */
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#define t_npc l2 /* Set by caller */
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#define t_wim l3 /* Set by caller */
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#define t_twinmask l4 /* Set at beginning of this entry routine. */
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#define t_kstack l5 /* Set right before pt_regs frame is built */
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#define t_retpc l6 /* If you change this, change winmacro.h header file */
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#define t_systable l7 /* Never touch this, could be the syscall table ptr. */
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#define curptr g6 /* Set after pt_regs frame is built */
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/* Number of register windows */
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.global _nwindows_min1, _nwindows
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.text
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.align 4
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.globl leonbare_trapsetup_fast
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/* etap entry special for irqtrap.S */
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leonbare_trapsetup_fast:
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#ifdef _FLAT
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restore
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RW_STORE(sp)
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save
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#endif
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#ifndef _SOFT_FLOAT
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/* build a pt_regs trap frame. */
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sub %fp, (SF_REGS_SZ + PT_REGS_SZ + FW_REGS_SZ), %t_kstack
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st %t_psr, [%t_kstack + (SF_REGS_SZ + PT_REGS_SZ + FW_REGS_SZ - 8)] /* sparc_fpuwindow_regs.irqpsr */
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set SPARC_PSR_EF_MASK, %t_twinmask
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andn %t_psr, %t_twinmask, %t_psr ! fpu off
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PT_STORE_ALL_FAST(t_kstack, t_psr, t_pc, t_npc, g2)
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/*PT_STORE_GLOBALS(t_kstack)*/
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/* build a fp_regs trap frame. */
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sethi %hi(fpustate_current), %g2
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ld [%g2+%lo(fpustate_current)], %g3
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st %g3,[%t_kstack + (SF_REGS_SZ + PT_REGS_SZ + FW_REGS_SZ - 4)] /* sparc_fpuwindow_regs.lastctx */
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add %t_kstack,SF_REGS_SZ + PT_REGS_SZ,%g3
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st %g3, [%g2+%lo(fpustate_current)]
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st %g0, [%g3 + FW_FSR]
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#else
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/* build a pt_regs trap frame.
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*/
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sub %fp, (SF_REGS_SZ + PT_REGS_SZ), %t_kstack
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PT_STORE_ALL_FAST(t_kstack, t_psr, t_pc, t_npc, g2)
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/*PT_STORE_GLOBALS(t_kstack)*/
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#endif
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#ifndef _FLAT
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/* See if we are in the trap window . */
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mov 1, %t_twinmask
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sll %t_twinmask, %t_psr, %t_twinmask ! t_twinmask = (1 << psr)
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andcc %t_twinmask, %t_wim, %g0
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beq 1f ! in trap window, clean up
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nop
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/*-------------------------------------------------*/
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/* Spill , adjust %wim and go. */
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srl %t_wim, 0x1, %g2 ! begin computation of new %wim
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sethi %hi(_nwindows_min1), %g3
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ld [%g3+%lo(_nwindows_min1)], %g3
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sll %t_wim, %g3, %t_wim ! NWINDOWS-1
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or %t_wim, %g2, %g2
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and %g2, 0xff, %g2
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save %g0, %g0, %g0 ! get in window to be saved
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/* Set new %wim value */
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wr %g2, 0x0, %wim
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/* Save the kernel window onto the corresponding stack. */
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RW_STORE(sp)
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restore %g0, %g0, %g0
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/*-------------------------------------------------*/
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1:
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#endif
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/* Trap from kernel with a window available.
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* Just do it...
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*/
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jmpl %t_retpc + 0x8, %g0 ! return to caller
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mov %t_kstack, %sp ! jump onto new stack
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