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de6cc651 | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
05b84117 MN |
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'. | |
05b84117 MN |
10 | */ |
11 | ||
12 | #include <asm/spu_csa.h> | |
13 | ||
14 | .data | |
15 | .align 7 | |
16 | .globl regs_spill | |
17 | regs_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 | |
43 | save_regs: | |
44 | lqr $4, save_reg_insts | |
45 | save_reg_loop: | |
46 | ai $4, $4, 4 | |
47 | .balignl 16, 0x40200000 | |
48 | save_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 | |
82 | exit: | |
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 |