From d2ccde1c8e90d38cee87a1b0309ad2827f3fd30d Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Mon, 11 Dec 2023 02:45:28 +0000
Subject: [PATCH] add boot partition size
---
kernel/include/linux/export.h | 175 ++++++++++++++++++++++++++++++++++++++--------------------
1 files changed, 115 insertions(+), 60 deletions(-)
diff --git a/kernel/include/linux/export.h b/kernel/include/linux/export.h
index e7ccb18..3b25f68 100644
--- a/kernel/include/linux/export.h
+++ b/kernel/include/linux/export.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef _LINUX_EXPORT_H
#define _LINUX_EXPORT_H
@@ -18,9 +19,6 @@
#define THIS_MODULE ((struct module *)0)
#endif
-#ifdef CONFIG_MODULES
-
-#if defined(__KERNEL__) && !defined(__GENKSYMS__)
#ifdef CONFIG_MODVERSIONS
/* Mark the CRC weak since genksyms apparently decides not to
* generate a checksums for some symbols */
@@ -29,13 +27,13 @@
asm(" .section \"___kcrctab" sec "+" #sym "\", \"a\" \n" \
" .weak __crc_" #sym " \n" \
" .long __crc_" #sym " - . \n" \
- " .previous \n");
+ " .previous \n")
#else
#define __CRC_SYMBOL(sym, sec) \
asm(" .section \"___kcrctab" sec "+" #sym "\", \"a\" \n" \
" .weak __crc_" #sym " \n" \
" .long __crc_" #sym " \n" \
- " .previous \n");
+ " .previous \n")
#endif
#else
#define __CRC_SYMBOL(sym, sec)
@@ -52,102 +50,159 @@
#define __KSYMTAB_ENTRY(sym, sec) \
__ADDRESSABLE(sym) \
asm(" .section \"___ksymtab" sec "+" #sym "\", \"a\" \n" \
- " .balign 8 \n" \
+ " .balign 4 \n" \
"__ksymtab_" #sym ": \n" \
" .long " #sym "- . \n" \
" .long __kstrtab_" #sym "- . \n" \
+ " .long __kstrtabns_" #sym "- . \n" \
" .previous \n")
struct kernel_symbol {
int value_offset;
int name_offset;
+ int namespace_offset;
};
#else
+#ifdef CONFIG_CFI_CLANG
+#include <linux/compiler.h>
+/*
+ * With -fno-sanitize-cfi-canonical-jump-tables, the compiler replaces
+ * references to functions with jump table addresses. Use inline assembly
+ * to emit ksymtab entries that point to the actual function instead.
+ */
+#define ___KSYMTAB_ENTRY(sym, sec, size) \
+ __ADDRESSABLE(sym) \
+ asm(" .section \"___ksymtab" sec "+" #sym "\", \"a\" \n" \
+ " .balign " #size " \n" \
+ "__ksymtab_" #sym ": \n" \
+ " ." #size "byte " #sym " \n" \
+ " ." #size "byte __kstrtab_" #sym " \n" \
+ " ." #size "byte __kstrtabns_" #sym " \n" \
+ " .previous \n")
+
+#ifdef CONFIG_64BIT
+#define __KSYMTAB_ENTRY(sym, sec) ___KSYMTAB_ENTRY(sym, sec, 8)
+#else
+#define __KSYMTAB_ENTRY(sym, sec) ___KSYMTAB_ENTRY(sym, sec, 4)
+#endif
+
+#else /* !CONFIG_CFI_CLANG */
+
#define __KSYMTAB_ENTRY(sym, sec) \
static const struct kernel_symbol __ksymtab_##sym \
__attribute__((section("___ksymtab" sec "+" #sym), used)) \
- = { (unsigned long)&sym, __kstrtab_##sym }
+ __aligned(sizeof(void *)) \
+ = { (unsigned long)&sym, __kstrtab_##sym, __kstrtabns_##sym }
+
+#endif
struct kernel_symbol {
unsigned long value;
const char *name;
+ const char *namespace;
};
#endif
-/* For every exported symbol, place a struct in the __ksymtab section */
-#define ___EXPORT_SYMBOL(sym, sec) \
- extern typeof(sym) sym; \
- __CRC_SYMBOL(sym, sec) \
- static const char __kstrtab_##sym[] \
- __attribute__((section("__ksymtab_strings"), used, aligned(1))) \
- = #sym; \
+#ifdef __GENKSYMS__
+
+#define ___EXPORT_SYMBOL(sym, sec, ns) __GENKSYMS_EXPORT_SYMBOL(sym)
+
+#else
+
+/*
+ * For every exported symbol, do the following:
+ *
+ * - If applicable, place a CRC entry in the __kcrctab section.
+ * - Put the name of the symbol and namespace (empty string "" for none) in
+ * __ksymtab_strings.
+ * - Place a struct kernel_symbol entry in the __ksymtab section.
+ *
+ * note on .section use: we specify progbits since usage of the "M" (SHF_MERGE)
+ * section flag requires it. Use '%progbits' instead of '@progbits' since the
+ * former apparently works on all arches according to the binutils source.
+ */
+#define ___EXPORT_SYMBOL(sym, sec, ns) \
+ extern typeof(sym) sym; \
+ extern const char __kstrtab_##sym[]; \
+ extern const char __kstrtabns_##sym[]; \
+ __CRC_SYMBOL(sym, sec); \
+ asm(" .section \"__ksymtab_strings\",\"aMS\",%progbits,1 \n" \
+ "__kstrtab_" #sym ": \n" \
+ " .asciz \"" #sym "\" \n" \
+ "__kstrtabns_" #sym ": \n" \
+ " .asciz \"" ns "\" \n" \
+ " .previous \n"); \
__KSYMTAB_ENTRY(sym, sec)
-#if defined(__DISABLE_EXPORTS)
+#endif
+
+#if !defined(CONFIG_MODULES) || defined(__DISABLE_EXPORTS)
/*
* Allow symbol exports to be disabled completely so that C code may
* be reused in other execution contexts such as the UEFI stub or the
* decompressor.
*/
-#define __EXPORT_SYMBOL(sym, sec)
-
-#elif defined(__KSYM_DEPS__)
-
-/*
- * For fine grained build dependencies, we want to tell the build system
- * about each possible exported symbol even if they're not actually exported.
- * We use a string pattern that is unlikely to be valid code that the build
- * system filters out from the preprocessor output (see ksym_dep_filter
- * in scripts/Kbuild.include).
- */
-#define __EXPORT_SYMBOL(sym, sec) === __KSYM_##sym ===
+#define __EXPORT_SYMBOL(sym, sec, ns)
#elif defined(CONFIG_TRIM_UNUSED_KSYMS) && !defined(MODULE)
#include <generated/autoksyms.h>
-#define __EXPORT_SYMBOL(sym, sec) \
- __cond_export_sym(sym, sec, __is_defined(__KSYM_##sym))
-#define __cond_export_sym(sym, sec, conf) \
- ___cond_export_sym(sym, sec, conf)
-#define ___cond_export_sym(sym, sec, enabled) \
- __cond_export_sym_##enabled(sym, sec)
-#define __cond_export_sym_1(sym, sec) ___EXPORT_SYMBOL(sym, sec)
-#define __cond_export_sym_0(sym, sec) /* nothing */
+/*
+ * For fine grained build dependencies, we want to tell the build system
+ * about each possible exported symbol even if they're not actually exported.
+ * We use a symbol pattern __ksym_marker_<symbol> that the build system filters
+ * from the $(NM) output (see scripts/gen_ksymdeps.sh). These symbols are
+ * discarded in the final link stage.
+ */
+#define __ksym_marker(sym) \
+ static int __ksym_marker_##sym[0] __section(".discard.ksym") __used
+#define __EXPORT_SYMBOL(sym, sec, ns) \
+ __ksym_marker(sym); \
+ __cond_export_sym(sym, sec, ns, __is_defined(__KSYM_##sym))
+#define __cond_export_sym(sym, sec, ns, conf) \
+ ___cond_export_sym(sym, sec, ns, conf)
+#define ___cond_export_sym(sym, sec, ns, enabled) \
+ __cond_export_sym_##enabled(sym, sec, ns)
+#define __cond_export_sym_1(sym, sec, ns) ___EXPORT_SYMBOL(sym, sec, ns)
+
+#ifdef __GENKSYMS__
+#define __cond_export_sym_0(sym, sec, ns) __GENKSYMS_EXPORT_SYMBOL(sym)
#else
-#define __EXPORT_SYMBOL ___EXPORT_SYMBOL
+#define __cond_export_sym_0(sym, sec, ns) /* nothing */
#endif
-#define EXPORT_SYMBOL(sym) \
- __EXPORT_SYMBOL(sym, "")
-
-#define EXPORT_SYMBOL_GPL(sym) \
- __EXPORT_SYMBOL(sym, "_gpl")
-
-#define EXPORT_SYMBOL_GPL_FUTURE(sym) \
- __EXPORT_SYMBOL(sym, "_gpl_future")
-
-#ifdef CONFIG_UNUSED_SYMBOLS
-#define EXPORT_UNUSED_SYMBOL(sym) __EXPORT_SYMBOL(sym, "_unused")
-#define EXPORT_UNUSED_SYMBOL_GPL(sym) __EXPORT_SYMBOL(sym, "_unused_gpl")
#else
-#define EXPORT_UNUSED_SYMBOL(sym)
-#define EXPORT_UNUSED_SYMBOL_GPL(sym)
-#endif
-#endif /* __GENKSYMS__ */
-
-#else /* !CONFIG_MODULES... */
-
-#define EXPORT_SYMBOL(sym)
-#define EXPORT_SYMBOL_GPL(sym)
-#define EXPORT_SYMBOL_GPL_FUTURE(sym)
-#define EXPORT_UNUSED_SYMBOL(sym)
-#define EXPORT_UNUSED_SYMBOL_GPL(sym)
+#define __EXPORT_SYMBOL(sym, sec, ns) ___EXPORT_SYMBOL(sym, sec, ns)
#endif /* CONFIG_MODULES */
+
+#ifdef DEFAULT_SYMBOL_NAMESPACE
+#include <linux/stringify.h>
+#define _EXPORT_SYMBOL(sym, sec) __EXPORT_SYMBOL(sym, sec, __stringify(DEFAULT_SYMBOL_NAMESPACE))
+#else
+#define _EXPORT_SYMBOL(sym, sec) __EXPORT_SYMBOL(sym, sec, "")
+#endif
+
+#define EXPORT_SYMBOL(sym) _EXPORT_SYMBOL(sym, "")
+#define EXPORT_SYMBOL_GPL(sym) _EXPORT_SYMBOL(sym, "_gpl")
+#define EXPORT_SYMBOL_GPL_FUTURE(sym) _EXPORT_SYMBOL(sym, "_gpl_future")
+#define _EXPORT_SYMBOL_NS(sym, ns) __EXPORT_SYMBOL(sym, "", #ns)
+#define _EXPORT_SYMBOL_NS_GPL(sym, ns) __EXPORT_SYMBOL(sym, "_gpl", #ns)
+#define EXPORT_SYMBOL_NS(sym, ns) _EXPORT_SYMBOL_NS(sym, ns)
+#define EXPORT_SYMBOL_NS_GPL(sym, ns) _EXPORT_SYMBOL_NS_GPL(sym, ns)
+
+#ifdef CONFIG_UNUSED_SYMBOLS
+#define EXPORT_UNUSED_SYMBOL(sym) _EXPORT_SYMBOL(sym, "_unused")
+#define EXPORT_UNUSED_SYMBOL_GPL(sym) _EXPORT_SYMBOL(sym, "_unused_gpl")
+#else
+#define EXPORT_UNUSED_SYMBOL(sym)
+#define EXPORT_UNUSED_SYMBOL_GPL(sym)
+#endif
+
#endif /* !__ASSEMBLY__ */
#endif /* _LINUX_EXPORT_H */
--
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