cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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spu_save_crt0.S (2041B)

      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