| 1 | /* |
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| 2 | * Copyright (c) 2011 Aeroflex Gaisler |
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| 3 | * |
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| 4 | * BSD license: |
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| 5 | * |
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| 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
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| 7 | * of this software and associated documentation files (the "Software"), to deal |
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| 8 | * in the Software without restriction, including without limitation the rights |
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| 9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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| 10 | * copies of the Software, and to permit persons to whom the Software is |
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| 11 | * furnished to do so, subject to the following conditions: |
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| 12 | * |
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| 13 | * The above copyright notice and this permission notice shall be included in |
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| 14 | * all copies or substantial portions of the Software. |
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| 15 | * |
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| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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| 19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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| 20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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| 21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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| 22 | * THE SOFTWARE. |
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| 23 | */ |
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| 24 | |
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| 25 | |
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| 26 | #include <asm-leon/leonstack.h> |
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| 27 | #include <asm-leon/winmacros.h> |
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| 28 | |
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| 29 | /* Registers to not touch at all. */ |
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| 30 | #define t_psr l0 /* Set by caller */ |
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| 31 | #define t_pc l1 /* Set by caller */ |
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| 32 | #define t_npc l2 /* Set by caller */ |
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| 33 | #define t_wim l3 /* Set by caller */ |
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| 34 | #define t_twinmask l4 /* Set at beginning of this entry routine. */ |
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| 35 | #define t_kstack l5 /* Set right before pt_regs frame is built */ |
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| 36 | #define t_retpc l6 /* If you change this, change winmacro.h header file */ |
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| 37 | #define t_systable l7 /* Never touch this, could be the syscall table ptr. */ |
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| 38 | #define curptr g6 /* Set after pt_regs frame is built */ |
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| 39 | |
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| 40 | /* Number of register windows */ |
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| 41 | .global _nwindows_min1, _nwindows |
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| 42 | |
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| 43 | .text |
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| 44 | .align 4 |
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| 45 | .globl leonbare_trapsetup |
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| 46 | |
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| 47 | leonbare_trapsetup: |
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| 48 | |
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| 49 | #ifdef _FLAT |
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| 50 | restore |
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| 51 | RW_STORE(sp) |
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| 52 | save |
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| 53 | #endif |
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| 54 | |
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| 55 | #ifndef _SOFT_FLOAT |
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| 56 | /* build a pt_regs trap frame. */ |
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| 57 | sub %fp, (SF_REGS_SZ + PT_REGS_SZ + FW_REGS_SZ), %t_kstack |
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| 58 | PT_STORE_ALL(t_kstack, t_psr, t_pc, t_npc, g2) |
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| 59 | |
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| 60 | /* build a fp_regs trap frame. */ |
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| 61 | sethi %hi(fpustate_current), %g2 |
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| 62 | ld [%g2+%lo(fpustate_current)], %g3 |
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| 63 | st %g3,[%t_kstack + (SF_REGS_SZ + PT_REGS_SZ + FW_REGS_SZ - 4)] |
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| 64 | add %t_kstack,SF_REGS_SZ + PT_REGS_SZ,%g3 |
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| 65 | st %g3, [%g2+%lo(fpustate_current)] |
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| 66 | |
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| 67 | #else |
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| 68 | /* build a pt_regs trap frame. |
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| 69 | */ |
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| 70 | sub %fp, (SF_REGS_SZ + PT_REGS_SZ), %t_kstack |
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| 71 | PT_STORE_ALL(t_kstack, t_psr, t_pc, t_npc, g2) |
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| 72 | #endif |
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| 73 | |
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| 74 | |
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| 75 | #ifndef _FLAT |
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| 76 | /* See if we are in the trap window. */ |
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| 77 | mov 1, %t_twinmask |
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| 78 | sll %t_twinmask, %t_psr, %t_twinmask ! t_twinmask = (1 << psr) |
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| 79 | andcc %t_twinmask, %t_wim, %g0 |
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| 80 | beq 1f ! in trap window, clean up |
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| 81 | nop |
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| 82 | |
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| 83 | /*-------------------------------------------------*/ |
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| 84 | /* Spill , adjust %wim and go. */ |
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| 85 | srl %t_wim, 0x1, %g2 ! begin computation of new %wim |
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| 86 | |
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| 87 | sethi %hi(_nwindows_min1), %g3 |
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| 88 | ld [%g3+%lo(_nwindows_min1)], %g3 |
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| 89 | |
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| 90 | sll %t_wim, %g3, %t_wim ! NWINDOWS-1 |
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| 91 | or %t_wim, %g2, %g2 |
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| 92 | and %g2, 0xff, %g2 |
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| 93 | |
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| 94 | save %g0, %g0, %g0 ! get in window to be saved |
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| 95 | |
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| 96 | /* Set new %wim value */ |
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| 97 | wr %g2, 0x0, %wim |
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| 98 | |
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| 99 | /* Save the kernel window onto the corresponding stack. */ |
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| 100 | RW_STORE(sp) |
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| 101 | |
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| 102 | restore %g0, %g0, %g0 |
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| 103 | /*-------------------------------------------------*/ |
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| 104 | |
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| 105 | 1: |
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| 106 | #endif |
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| 107 | /* Trap from kernel with a window available. |
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| 108 | * Just do it... |
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| 109 | */ |
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| 110 | jmpl %t_retpc + 0x8, %g0 ! return to caller |
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| 111 | mov %t_kstack, %sp ! jump onto new stack |
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| 112 | |
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| 113 | |
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