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Date: Tue, 24 Aug 2021 06:38:33 -0700
From: "H.J. Lu" <hjl.tools@...il.com>
To: libc-alpha@...rceware.org
Cc: gdb@...rceware.org,
libc-coord@...ts.openwall.com,
Daniel Walker <danielwa@...co.com>
Subject: [PATCH v5 1/2] Add declare_object_symbol_alias for assembly codes [BZ #28128]
There are 2 problems in:
#define declare_symbol_alias(symbol, original, type, size) \
declare_symbol_alias_1 (symbol, original, type, size)
#ifdef __ASSEMBLER__
# define declare_symbol_alias_1(symbol, original, type, size) \
strong_alias (original, symbol); \
.type C_SYMBOL_NAME (symbol), %##type; \
.size C_SYMBOL_NAME (symbol), size
1. .type and .size are substituted by arguments.
2. %##type is expanded to "% type" due to the GCC bug:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101613
But assembler doesn't support "% type".
Workaround BZ #28128 by
1. Don't define declare_symbol_alias for assembly codes.
2. Define declare_object_symbol_alias for assembly codes.
---
include/libc-symbols.h | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
diff --git a/include/libc-symbols.h b/include/libc-symbols.h
index d41ecf4384..1678071d77 100644
--- a/include/libc-symbols.h
+++ b/include/libc-symbols.h
@@ -324,14 +324,16 @@ for linking")
This is only necessary when defining something in assembly, or playing
funny alias games where the size should be other than what the compiler
thinks it is. */
-#define declare_symbol_alias(symbol, original, type, size) \
- declare_symbol_alias_1 (symbol, original, type, size)
#ifdef __ASSEMBLER__
-# define declare_symbol_alias_1(symbol, original, type, size) \
+# define declare_object_symbol_alias(symbol, original, size) \
+ declare_object_symbol_alias_1 (symbol, original, size)
+# define declare_object_symbol_alias_1(symbol, original, s_size) \
strong_alias (original, symbol); \
- .type C_SYMBOL_NAME (symbol), %##type; \
- .size C_SYMBOL_NAME (symbol), size
+ .type C_SYMBOL_NAME (symbol), %object; \
+ .size C_SYMBOL_NAME (symbol), s_size
#else /* Not __ASSEMBLER__. */
+# define declare_symbol_alias(symbol, original, type, size) \
+ declare_symbol_alias_1 (symbol, original, type, size)
# define declare_symbol_alias_1(symbol, original, type, size) \
asm (".globl " __SYMBOL_PREFIX #symbol \
"\n\t" declare_symbol_alias_1_alias (symbol, original) \
--
2.31.1
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