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