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authorMasahiro Yamada <masahiroy@kernel.org>2022-08-03 22:50:13 +0900
committerMasahiro Yamada <masahiroy@kernel.org>2022-08-03 22:56:46 +0900
commit36b0f0deed4fcbe9ff31268e6c3554714e4d2387 (patch)
treefa154c5ab6a1ae0c09f5cd29559b43e4765ff1f8 /scripts/mod/modpost.h
parentdd29865633a5535889568b5f38f74a445c227e5d (diff)
modpost: refactor get_secindex()
SPECIAL() is only used in get_secindex(). Squash it. Make the code more readable with more comments. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Diffstat (limited to 'scripts/mod/modpost.h')
-rw-r--r--scripts/mod/modpost.h30
1 files changed, 18 insertions, 12 deletions
diff --git a/scripts/mod/modpost.h b/scripts/mod/modpost.h
index bd874f906781..1178f40a73f3 100644
--- a/scripts/mod/modpost.h
+++ b/scripts/mod/modpost.h
@@ -156,22 +156,28 @@ static inline int is_shndx_special(unsigned int i)
return i != SHN_XINDEX && i >= SHN_LORESERVE && i <= SHN_HIRESERVE;
}
-/*
- * Move reserved section indices SHN_LORESERVE..SHN_HIRESERVE out of
- * the way to -256..-1, to avoid conflicting with real section
- * indices.
- */
-#define SPECIAL(i) ((i) - (SHN_HIRESERVE + 1))
-
/* Accessor for sym->st_shndx, hides ugliness of "64k sections" */
static inline unsigned int get_secindex(const struct elf_info *info,
const Elf_Sym *sym)
{
- if (is_shndx_special(sym->st_shndx))
- return SPECIAL(sym->st_shndx);
- if (sym->st_shndx != SHN_XINDEX)
- return sym->st_shndx;
- return info->symtab_shndx_start[sym - info->symtab_start];
+ unsigned int index = sym->st_shndx;
+
+ /*
+ * Elf{32,64}_Sym::st_shndx is 2 byte. Big section numbers are available
+ * in the .symtab_shndx section.
+ */
+ if (index == SHN_XINDEX)
+ return info->symtab_shndx_start[sym - info->symtab_start];
+
+ /*
+ * Move reserved section indices SHN_LORESERVE..SHN_HIRESERVE out of
+ * the way to UINT_MAX-255..UINT_MAX, to avoid conflicting with real
+ * section indices.
+ */
+ if (index >= SHN_LORESERVE && index <= SHN_HIRESERVE)
+ return index - SHN_HIRESERVE - 1;
+
+ return index;
}
/* file2alias.c */