Linux kernel mirror (for testing)
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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * misc.c
4 *
5 * This is a collection of several routines from gzip-1.0.3
6 * adapted for Linux.
7 *
8 * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
9 *
10 * Modified for ARM Linux by Russell King
11 *
12 * Nicolas Pitre <nico@visuaide.com> 1999/04/14 :
13 * For this code to run directly from Flash, all constant variables must
14 * be marked with 'const' and all other variables initialized at run-time
15 * only. This way all non constant variables will end up in the bss segment,
16 * which should point to addresses in RAM and cleared to 0 on start.
17 * This allows for a much quicker boot time.
18 */
19
20unsigned int __machine_arch_type;
21
22#include <linux/compiler.h> /* for inline */
23#include <linux/types.h>
24#include <linux/linkage.h>
25#include "misc.h"
26
27static void putstr(const char *ptr);
28
29#include CONFIG_UNCOMPRESS_INCLUDE
30
31#ifdef CONFIG_DEBUG_ICEDCC
32
33#if defined(CONFIG_CPU_V6) || defined(CONFIG_CPU_V6K) || defined(CONFIG_CPU_V7)
34
35static void icedcc_putc(int ch)
36{
37 int status, i = 0x4000000;
38
39 do {
40 if (--i < 0)
41 return;
42
43 asm volatile ("mrc p14, 0, %0, c0, c1, 0" : "=r" (status));
44 } while (status & (1 << 29));
45
46 asm("mcr p14, 0, %0, c0, c5, 0" : : "r" (ch));
47}
48
49
50#elif defined(CONFIG_CPU_XSCALE)
51
52static void icedcc_putc(int ch)
53{
54 int status, i = 0x4000000;
55
56 do {
57 if (--i < 0)
58 return;
59
60 asm volatile ("mrc p14, 0, %0, c14, c0, 0" : "=r" (status));
61 } while (status & (1 << 28));
62
63 asm("mcr p14, 0, %0, c8, c0, 0" : : "r" (ch));
64}
65
66#else
67
68static void icedcc_putc(int ch)
69{
70 int status, i = 0x4000000;
71
72 do {
73 if (--i < 0)
74 return;
75
76 asm volatile ("mrc p14, 0, %0, c0, c0, 0" : "=r" (status));
77 } while (status & 2);
78
79 asm("mcr p14, 0, %0, c1, c0, 0" : : "r" (ch));
80}
81
82#endif
83
84#define putc(ch) icedcc_putc(ch)
85#endif
86
87static void putstr(const char *ptr)
88{
89 char c;
90
91 while ((c = *ptr++) != '\0') {
92 if (c == '\n')
93 putc('\r');
94 putc(c);
95 }
96
97 flush();
98}
99
100/*
101 * gzip declarations
102 */
103extern char input_data[];
104extern char input_data_end[];
105
106unsigned char *output_data;
107
108unsigned long free_mem_ptr;
109unsigned long free_mem_end_ptr;
110
111#ifndef arch_error
112#define arch_error(x)
113#endif
114
115void error(char *x)
116{
117 arch_error(x);
118
119 putstr("\n\n");
120 putstr(x);
121 putstr("\n\n -- System halted");
122
123 while(1); /* Halt */
124}
125
126asmlinkage void __div0(void)
127{
128 error("Attempting division by 0!");
129}
130
131const unsigned long __stack_chk_guard = 0x000a0dff;
132
133void __stack_chk_fail(void)
134{
135 error("stack-protector: Kernel stack is corrupted\n");
136}
137
138extern int do_decompress(u8 *input, int len, u8 *output, void (*error)(char *x));
139
140
141void
142decompress_kernel(unsigned long output_start, unsigned long free_mem_ptr_p,
143 unsigned long free_mem_ptr_end_p,
144 int arch_id)
145{
146 int ret;
147
148 output_data = (unsigned char *)output_start;
149 free_mem_ptr = free_mem_ptr_p;
150 free_mem_end_ptr = free_mem_ptr_end_p;
151 __machine_arch_type = arch_id;
152
153 arch_decomp_setup();
154
155 putstr("Uncompressing Linux...");
156 ret = do_decompress(input_data, input_data_end - input_data,
157 output_data, error);
158 if (ret)
159 error("decompressor returned an error");
160 else
161 putstr(" done, booting the kernel.\n");
162}
163
164void fortify_panic(const char *name)
165{
166 error("detected buffer overflow");
167}