/*
* 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
