LXR linux/arch/powerpc/platforms/cell/spufs/spu_save

   1/* SPDX-License-Identifier: GPL-2.0-or-later */
   2/*
   3 * crt0_s.S: Entry function for SPU-side context save.
   4 *
   5 * Copyright (C) 2005 IBM
   6 *
   7 * Entry function for SPU-side of the context save sequence.
   8 * Saves all 128 GPRs, sets up an initial stack frame, then
   9 * branches to 'main'.
  10 */
  11
  12#include <asm/spu_csa.h>
  13
  14.data
  15.align 7
  16.globl regs_spill
  17regs_spill:
  18.space SIZEOF_SPU_SPILL_REGS, 0x0
  19
  20.text
  21.global _start
  22_start:
  23        /* SPU Context Save Step 1: Save the first 16 GPRs. */
  24        stqa $0, regs_spill + 0
  25        stqa $1, regs_spill + 16
  26        stqa $2, regs_spill + 32
  27        stqa $3, regs_spill + 48
  28        stqa $4, regs_spill + 64
  29        stqa $5, regs_spill + 80
  30        stqa $6, regs_spill + 96
  31        stqa $7, regs_spill + 112
  32        stqa $8, regs_spill + 128
  33        stqa $9, regs_spill + 144
  34        stqa $10, regs_spill + 160
  35        stqa $11, regs_spill + 176
  36        stqa $12, regs_spill + 192
  37        stqa $13, regs_spill + 208
  38        stqa $14, regs_spill + 224
  39        stqa $15, regs_spill + 240
  40
  41        /* SPU Context Save, Step 8: Save the remaining 112 GPRs. */
  42        ila     $3, regs_spill + 256
  43save_regs:
  44        lqr     $4, save_reg_insts
  45save_reg_loop:
  46        ai      $4, $4, 4
  47        .balignl 16, 0x40200000
  48save_reg_insts:       /* must be quad-word aligned. */
  49        stqd    $16, 0($3)
  50        stqd    $17, 16($3)
  51        stqd    $18, 32($3)
  52        stqd    $19, 48($3)
  53        andi    $5, $4, 0x7F
  54        stqr    $4, save_reg_insts
  55        ai      $3, $3, 64
  56        brnz    $5, save_reg_loop
  57
  58        /* Initialize the stack pointer to point to 16368
  59         * (16kb-16). The back chain pointer is initialized
  60         * to NULL.
  61         */
  62        il      $0, 0
  63        il      $SP, 16368
  64        stqd    $0, 0($SP)
  65
  66        /* Allocate a minimum stack frame for the called main.
  67         * This is needed so that main has a place to save the
  68         * link register when it calls another function.
  69         */
  70        stqd    $SP, -160($SP)
  71        ai      $SP, $SP, -160
  72
  73        /* Call the program's main function. */
  74        brsl    $0, main
  75
  76        /* In this case main should not return; if it does
  77         * there has been an error in the sequence.  Execute
  78         * stop-and-signal with code=0.
  79         */
  80.global exit
  81.global _exit
  82exit:
  83_exit:
  84        stop    0x0
  85
  86        /* Pad the size of this crt0.o to be multiple of 16 bytes. */
  87.balignl 16, 0x0
  88
  89