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jeremybenn |
/* This file contains the GPR save and restore routines for Darwin.
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*
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* Copyright (C) 2011 Free Software Foundation, Inc.
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*
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* This file is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 3, or (at your option) any
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* later version.
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*
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* This file is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* Under Section 7 of GPL version 3, you are granted additional
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* permissions described in the GCC Runtime Library Exception, version
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* 3.1, as published by the Free Software Foundation.
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*
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* You should have received a copy of the GNU General Public License and
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* a copy of the GCC Runtime Library Exception along with this program;
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* see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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* .
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*/
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/* Contributed by Iain Sandoe */
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/* Like their FP and VEC counterparts, these routines have only one externally
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visible entry point. Calls have to be constructed as offsets from this.
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(I.E. callers have to jump to "saveGPR+((x-13)*4" to save registers x..31).
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Each save/load instruction is 4 bytes long (for both m32 and m64 builds).
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The save/restores here are done w.r.t r11.
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restGPRx restores the link reg from the stack and returns to the saved
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address.
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*/
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#include "darwin-asm.h"
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.text
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.align 2
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.private_extern saveGPR
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saveGPR:
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stg r13,(-19 * GPR_BYTES)(r11)
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stg r14,(-18 * GPR_BYTES)(r11)
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stg r15,(-17 * GPR_BYTES)(r11)
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stg r16,(-16 * GPR_BYTES)(r11)
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stg r17,(-15 * GPR_BYTES)(r11)
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stg r18,(-14 * GPR_BYTES)(r11)
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stg r19,(-13 * GPR_BYTES)(r11)
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stg r20,(-12 * GPR_BYTES)(r11)
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stg r21,(-11 * GPR_BYTES)(r11)
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stg r22,(-10 * GPR_BYTES)(r11)
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stg r23,( -9 * GPR_BYTES)(r11)
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stg r24,( -8 * GPR_BYTES)(r11)
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stg r25,( -7 * GPR_BYTES)(r11)
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stg r26,( -6 * GPR_BYTES)(r11)
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stg r27,( -5 * GPR_BYTES)(r11)
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stg r28,( -4 * GPR_BYTES)(r11)
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stg r29,( -3 * GPR_BYTES)(r11)
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stg r30,( -2 * GPR_BYTES)(r11)
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stg r31,( -1 * GPR_BYTES)(r11)
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blr
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/* */
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.private_extern restGPR
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restGPR:
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lg r13,(-19 * GPR_BYTES)(r11)
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lg r14,(-18 * GPR_BYTES)(r11)
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lg r15,(-17 * GPR_BYTES)(r11)
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lg r16,(-16 * GPR_BYTES)(r11)
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lg r17,(-15 * GPR_BYTES)(r11)
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lg r18,(-14 * GPR_BYTES)(r11)
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lg r19,(-13 * GPR_BYTES)(r11)
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lg r20,(-12 * GPR_BYTES)(r11)
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lg r21,(-11 * GPR_BYTES)(r11)
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lg r22,(-10 * GPR_BYTES)(r11)
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lg r23,( -9 * GPR_BYTES)(r11)
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lg r24,( -8 * GPR_BYTES)(r11)
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lg r25,( -7 * GPR_BYTES)(r11)
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lg r26,( -6 * GPR_BYTES)(r11)
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lg r27,( -5 * GPR_BYTES)(r11)
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lg r28,( -4 * GPR_BYTES)(r11)
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lg r29,( -3 * GPR_BYTES)(r11)
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lg r30,( -2 * GPR_BYTES)(r11)
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lg r31,( -1 * GPR_BYTES)(r11)
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blr
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.private_extern restGPRx
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restGPRx:
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lg r13,(-19 * GPR_BYTES)(r11)
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lg r14,(-18 * GPR_BYTES)(r11)
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lg r15,(-17 * GPR_BYTES)(r11)
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lg r16,(-16 * GPR_BYTES)(r11)
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lg r17,(-15 * GPR_BYTES)(r11)
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lg r18,(-14 * GPR_BYTES)(r11)
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lg r19,(-13 * GPR_BYTES)(r11)
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lg r20,(-12 * GPR_BYTES)(r11)
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lg r21,(-11 * GPR_BYTES)(r11)
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lg r22,(-10 * GPR_BYTES)(r11)
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lg r23,( -9 * GPR_BYTES)(r11)
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lg r24,( -8 * GPR_BYTES)(r11)
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lg r25,( -7 * GPR_BYTES)(r11)
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lg r26,( -6 * GPR_BYTES)(r11)
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lg r27,( -5 * GPR_BYTES)(r11)
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lg r28,( -4 * GPR_BYTES)(r11)
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lg r29,( -3 * GPR_BYTES)(r11)
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/* Like the FP restore, we start from the offset for r30
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thus a restore of only r31 is not going to work. */
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lg r0,SAVED_LR_OFFSET(r1)
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lg r30,( -2 * GPR_BYTES)(r11)
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mtlr r0
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lg r31,( -1 * GPR_BYTES)(r11)
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blr
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