source: mainline/uspace/lib/c/arch/arm64/include/libarch/elf_linux.h

Last change on this file was 84176f3, checked in by Jakub Jermář <jakub@…>, 6 years ago

arm64: Add support for the architecture

This changeset adds basic support to run HelenOS on AArch64, targeting
the QEMU virt platform.

Boot:

  • Boot relies on the EDK II firmware, GRUB2 for EFI and the HelenOS bootloader (UEFI application). EDK II loads GRUB2 from a CD, GRUB2 loads the HelenOS bootloader (via UEFI) which loads OS components.
  • UEFI applications use the PE/COFF format and must be relocatable. The first problem is solved by manually having the PE/COFF headers and tables written in assembler. The relocatable requirement is addressed by compiling the code with -fpic and having the bootloader relocate itself at its startup.

Kernel:

  • Kernel code for AArch64 consists mostly of stubbing out various architecture-specific hooks: virtual memory management, interrupt and exception handling, context switching (including FPU lazy switching), support for virtual timer, atomic sequences and barriers, cache and TLB maintenance, thread and process initialization.
  • The patch adds a kernel driver for GICv2 (interrupt controller).
  • The PL011 kernel driver is extended to allow userspace to take ownership of the console.
  • The current code is not able to dynamically obtain information about available devices on the underlying machine. The port instead implements a machine-func interface similar to the one implemented by arm32. It defines a machine for the QEMU AArch64 virt platform. The configuration (device addresses and IRQ numbers) is then baked into the machine definition.

User space:

  • Uspace code for AArch64 similarly mostly implements architecture-specific hooks: context saving/restoring, syscall support, TLS support.

The patchset allows to boot the system but user interaction with the OS
is not yet possible.
  • Property mode set to 100644
File size: 3.5 KB
Line 
1/*
2 * Copyright (c) 2015 Petr Pavlu
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/** @addtogroup libcarm64
30 * @{
31 */
32/** @file Definitions needed to write core files in Linux-ELF format.
33 */
34
35#ifndef _LIBC_arm64_ELF_LINUX_H_
36#define _LIBC_arm64_ELF_LINUX_H_
37
38#include <libarch/istate.h>
39#include <stdint.h>
40
41/** Linux kernel struct pt_regs structure.
42 *
43 * We need this to save register state to a core file in Linux format
44 * (readable by GDB configured for Linux target).
45 */
46typedef struct {
47 uint64_t x0;
48 uint64_t x1;
49 uint64_t x2;
50 uint64_t x3;
51 uint64_t x4;
52 uint64_t x5;
53 uint64_t x6;
54 uint64_t x7;
55 uint64_t x8;
56 uint64_t x9;
57 uint64_t x10;
58 uint64_t x11;
59 uint64_t x12;
60 uint64_t x13;
61 uint64_t x14;
62 uint64_t x15;
63 uint64_t x16;
64 uint64_t x17;
65 uint64_t x18;
66 uint64_t x19;
67 uint64_t x20;
68 uint64_t x21;
69 uint64_t x22;
70 uint64_t x23;
71 uint64_t x24;
72 uint64_t x25;
73 uint64_t x26;
74 uint64_t x27;
75 uint64_t x28;
76 uint64_t x29;
77 uint64_t x30;
78
79 uint64_t sp;
80 uint64_t pc;
81 uint64_t pstate;
82
83 uint64_t orig_x0;
84 uint64_t syscallno;
85} elf_regs_t;
86
87/** Convert istate_t to elf_regs_t. */
88static inline void istate_to_elf_regs(istate_t *istate, elf_regs_t *elf_regs)
89{
90 elf_regs->x0 = istate->x0;
91 elf_regs->x1 = istate->x1;
92 elf_regs->x2 = istate->x2;
93 elf_regs->x3 = istate->x3;
94 elf_regs->x4 = istate->x4;
95 elf_regs->x5 = istate->x5;
96 elf_regs->x6 = istate->x6;
97 elf_regs->x7 = istate->x7;
98 elf_regs->x8 = istate->x8;
99 elf_regs->x9 = istate->x9;
100 elf_regs->x10 = istate->x10;
101 elf_regs->x11 = istate->x11;
102 elf_regs->x12 = istate->x12;
103 elf_regs->x13 = istate->x13;
104 elf_regs->x14 = istate->x14;
105 elf_regs->x15 = istate->x15;
106 elf_regs->x16 = istate->x16;
107 elf_regs->x17 = istate->x17;
108 elf_regs->x18 = istate->x18;
109 elf_regs->x19 = istate->x19;
110 elf_regs->x20 = istate->x20;
111 elf_regs->x21 = istate->x21;
112 elf_regs->x22 = istate->x22;
113 elf_regs->x23 = istate->x23;
114 elf_regs->x24 = istate->x24;
115 elf_regs->x25 = istate->x25;
116 elf_regs->x26 = istate->x26;
117 elf_regs->x27 = istate->x27;
118 elf_regs->x28 = istate->x28;
119 elf_regs->x29 = istate->x29;
120 elf_regs->x30 = istate->x30;
121
122 elf_regs->sp = istate->sp;
123 elf_regs->pc = istate->pc;
124 elf_regs->pstate = istate->spsr;
125
126 elf_regs->orig_x0 = 0;
127 elf_regs->syscallno = 0;
128}
129
130#endif
131
132/** @}
133 */
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