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
20 unsigned 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
27 static 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
icedcc_putc(int ch)35 static 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
icedcc_putc(int ch)52 static 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
icedcc_putc(int ch)68 static 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
putstr(const char * ptr)87 static 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 */
103 extern char input_data[];
104 extern char input_data_end[];
105
106 unsigned char *output_data;
107
108 unsigned long free_mem_ptr;
109 unsigned long free_mem_end_ptr;
110
111 #ifndef arch_error
112 #define arch_error(x)
113 #endif
114
error(char * x)115 void 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
__div0(void)126 asmlinkage void __div0(void)
127 {
128 error("Attempting division by 0!");
129 }
130
131 const unsigned long __stack_chk_guard = 0x000a0dff;
132
__stack_chk_fail(void)133 void __stack_chk_fail(void)
134 {
135 error("stack-protector: Kernel stack is corrupted\n");
136 }
137
138 extern int do_decompress(u8 *input, int len, u8 *output, void (*error)(char *x));
139
140
141 void
decompress_kernel(unsigned long output_start,unsigned long free_mem_ptr_p,unsigned long free_mem_ptr_end_p,int arch_id)142 decompress_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
fortify_panic(const char * name)164 void fortify_panic(const char *name)
165 {
166 error("detected buffer overflow");
167 }
168