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-rw-r--r--arch/arm/boot/compressed/decompress.c66
1 files changed, 66 insertions, 0 deletions
diff --git a/arch/arm/boot/compressed/decompress.c b/arch/arm/boot/compressed/decompress.c
new file mode 100644
index 0000000000..0669851394
--- /dev/null
+++ b/arch/arm/boot/compressed/decompress.c
@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: GPL-2.0
+#define _LINUX_STRING_H_
+
+#include <linux/compiler.h> /* for inline */
+#include <linux/types.h> /* for size_t */
+#include <linux/stddef.h> /* for NULL */
+#include <linux/linkage.h>
+#include <asm/string.h>
+#include "misc.h"
+
+#define STATIC static
+#define STATIC_RW_DATA /* non-static please */
+
+/* Diagnostic functions */
+#ifdef DEBUG
+# define Assert(cond,msg) {if(!(cond)) error(msg);}
+# define Trace(x) fprintf x
+# define Tracev(x) {if (verbose) fprintf x ;}
+# define Tracevv(x) {if (verbose>1) fprintf x ;}
+# define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
+# define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
+#else
+# define Assert(cond,msg)
+# define Trace(x)
+# define Tracev(x)
+# define Tracevv(x)
+# define Tracec(c,x)
+# define Tracecv(c,x)
+#endif
+
+/* Not needed, but used in some headers pulled in by decompressors */
+extern char * strstr(const char * s1, const char *s2);
+extern size_t strlen(const char *s);
+extern int strcmp(const char *cs, const char *ct);
+extern int memcmp(const void *cs, const void *ct, size_t count);
+extern char * strchrnul(const char *, int);
+
+#ifdef CONFIG_KERNEL_GZIP
+#include "../../../../lib/decompress_inflate.c"
+#endif
+
+#ifdef CONFIG_KERNEL_LZO
+#include "../../../../lib/decompress_unlzo.c"
+#endif
+
+#ifdef CONFIG_KERNEL_LZMA
+#include "../../../../lib/decompress_unlzma.c"
+#endif
+
+#ifdef CONFIG_KERNEL_XZ
+/* Prevent KASAN override of string helpers in decompressor */
+#undef memmove
+#define memmove memmove
+#undef memcpy
+#define memcpy memcpy
+#include "../../../../lib/decompress_unxz.c"
+#endif
+
+#ifdef CONFIG_KERNEL_LZ4
+#include "../../../../lib/decompress_unlz4.c"
+#endif
+
+int do_decompress(u8 *input, int len, u8 *output, void (*error)(char *x))
+{
+ return __decompress(input, len, NULL, NULL, output, 0, NULL, error);
+}