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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / e54ddc32cf09dc43f7321431d8047ec6eabb5bbf / . / examples / api / crt0.S
blob: f1b88ed8a3dc8ae3fb7c72cd195ef771417095b2 [file] [log] [blame]
Tom Rini83d290c2018-05-06 17:58:06 -0400[diff] [blame]1/* SPDX-License-Identifier: GPL-2.0+ */
Rafal Jaworowski500856e2008-01-09 19:39:36 +0100[diff] [blame]2/*
3 * (C) Copyright 2007 Semihalf
4 *
5 * Written by: Rafal Jaworowski <raj@semihalf.com>
Rafal Jaworowski500856e2008-01-09 19:39:36 +0100[diff] [blame]6 */
7
8#if defined(CONFIG_PPC)
9
10 .text
Rafal Jaworowski500856e2008-01-09 19:39:36 +0100[diff] [blame]11 .globl _start
12_start:
Rafal Jaworowskib84d7d82009-01-23 13:27:15 +0100[diff] [blame]13 lis %r11, search_hint@ha
14 addi %r11, %r11, search_hint@l
15 stw %r1, 0(%r11)
Rafal Jaworowski500856e2008-01-09 19:39:36 +0100[diff] [blame]16 b main
17
18
19 .globl syscall
20syscall:
21 lis %r11, syscall_ptr@ha
22 addi %r11, %r11, syscall_ptr@l
23 lwz %r11, 0(%r11)
24 mtctr %r11
25 bctr
Rafal Jaworowski7fb6c4f2009-01-23 13:27:16 +0100[diff] [blame]26
Heinrich Schuchardta3c101a2024-11-03 06:35:49 +0100[diff] [blame]27#elif defined(CONFIG_ARM) && !defined(CONFIG_ARM64)
Rafal Jaworowski7fb6c4f2009-01-23 13:27:16 +0100[diff] [blame]28
29 .text
30 .globl _start
31_start:
32 ldr ip, =search_hint
33 str sp, [ip]
34 b main
35
36
37 .globl syscall
38syscall:
39 ldr ip, =syscall_ptr
40 ldr pc, [ip]
41
Heinrich Schuchardta3c101a2024-11-03 06:35:49 +0100[diff] [blame]42#elif defined(CONFIG_ARM64)
43
44 .text
45 .globl _start
46_start:
47 ldr x17, =search_hint
48 mov x16, sp
49 str x16, [x17]
50 b main
51
52 .globl syscall
53syscall:
54 ldr x16, =syscall_ptr
55 ldr x16, [x16]
56 br x16
57
Stanislav Galabov7c604232016-02-04 12:13:44 +0200[diff] [blame]58#elif defined(CONFIG_MIPS)
Stanislav Galabov78757d52016-02-17 15:23:31 +0200[diff] [blame]59#include <asm/asm.h>
Stanislav Galabov7c604232016-02-04 12:13:44 +0200[diff] [blame]60 .text
61 .globl __start
62 .ent __start
63__start:
Stanislav Galabov78757d52016-02-17 15:23:31 +0200[diff] [blame]64 PTR_S $sp, search_hint
Stanislav Galabov7c604232016-02-04 12:13:44 +0200[diff] [blame]65 b main
66 .end __start
67
68 .globl syscall
69 .ent syscall
70syscall:
Stanislav Galabov78757d52016-02-17 15:23:31 +0200[diff] [blame]71 PTR_S $ra, return_addr
72 PTR_L $t9, syscall_ptr
Stanislav Galabov7c604232016-02-04 12:13:44 +0200[diff] [blame]73 jalr $t9
74 nop
Stanislav Galabov78757d52016-02-17 15:23:31 +0200[diff] [blame]75 PTR_L $ra, return_addr
Stanislav Galabov7c604232016-02-04 12:13:44 +0200[diff] [blame]76 jr $ra
77 nop
78 .end syscall
79
80return_addr:
Stanislav Galabov78757d52016-02-17 15:23:31 +0200[diff] [blame]81 .align 8
Stanislav Galabov7c604232016-02-04 12:13:44 +0200[diff] [blame]82 .long 0
Rafal Jaworowskib84d7d82009-01-23 13:27:15 +0100[diff] [blame]83#else
84#error No support for this arch!
85#endif
Rafal Jaworowski500856e2008-01-09 19:39:36 +0100[diff] [blame]86
Heinrich Schuchardta3c101a2024-11-03 06:35:49 +0100[diff] [blame]87.section .data
88
Rafal Jaworowski500856e2008-01-09 19:39:36 +0100[diff] [blame]89 .globl syscall_ptr
90syscall_ptr:
Stanislav Galabov78757d52016-02-17 15:23:31 +0200[diff] [blame]91 .align 8
Rafal Jaworowski500856e2008-01-09 19:39:36 +0100[diff] [blame]92 .long 0
Rafal Jaworowskib84d7d82009-01-23 13:27:15 +0100[diff] [blame]93
94 .globl search_hint
95search_hint:
Heinrich Schuchardta3c101a2024-11-03 06:35:49 +0100[diff] [blame]96 .long 0