/* * 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