103 lines
2.6 KiB
ArmAsm
103 lines
2.6 KiB
ArmAsm
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/*
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* crt0_s.S: Entry function for SPU-side context save.
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*
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* Copyright (C) 2005 IBM
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*
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* Entry function for SPU-side of the context save sequence.
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* Saves all 128 GPRs, sets up an initial stack frame, then
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* branches to 'main'.
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <asm/spu_csa.h>
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.data
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.align 7
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.globl regs_spill
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regs_spill:
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.space SIZEOF_SPU_SPILL_REGS, 0x0
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.text
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.global _start
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_start:
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/* SPU Context Save Step 1: Save the first 16 GPRs. */
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stqa $0, regs_spill + 0
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stqa $1, regs_spill + 16
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stqa $2, regs_spill + 32
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stqa $3, regs_spill + 48
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stqa $4, regs_spill + 64
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stqa $5, regs_spill + 80
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stqa $6, regs_spill + 96
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stqa $7, regs_spill + 112
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stqa $8, regs_spill + 128
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stqa $9, regs_spill + 144
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stqa $10, regs_spill + 160
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stqa $11, regs_spill + 176
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stqa $12, regs_spill + 192
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stqa $13, regs_spill + 208
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stqa $14, regs_spill + 224
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stqa $15, regs_spill + 240
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/* SPU Context Save, Step 8: Save the remaining 112 GPRs. */
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ila $3, regs_spill + 256
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save_regs:
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lqr $4, save_reg_insts
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save_reg_loop:
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ai $4, $4, 4
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.balignl 16, 0x40200000
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save_reg_insts: /* must be quad-word aligned. */
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stqd $16, 0($3)
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stqd $17, 16($3)
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stqd $18, 32($3)
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stqd $19, 48($3)
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andi $5, $4, 0x7F
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stqr $4, save_reg_insts
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ai $3, $3, 64
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brnz $5, save_reg_loop
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/* Initialize the stack pointer to point to 16368
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* (16kb-16). The back chain pointer is initialized
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* to NULL.
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*/
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il $0, 0
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il $SP, 16368
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stqd $0, 0($SP)
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/* Allocate a minimum stack frame for the called main.
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* This is needed so that main has a place to save the
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* link register when it calls another function.
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*/
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stqd $SP, -160($SP)
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ai $SP, $SP, -160
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/* Call the program's main function. */
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brsl $0, main
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/* In this case main should not return; if it does
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* there has been an error in the sequence. Execute
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* stop-and-signal with code=0.
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*/
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.global exit
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.global _exit
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exit:
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_exit:
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stop 0x0
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/* Pad the size of this crt0.o to be multiple of 16 bytes. */
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.balignl 16, 0x0
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