Use RELA relocations properly for R_DATA_PTR on x86_64.

libtcc.c: Add greloca, a generalisation of greloc that takes an addend.
tcc.h: Add greloca and put_elf_reloca.
tccelf.c: Add put_elf_reloca, a generalisation of put_elf_reloc.
tccgen.c: On x86_64, use greloca instead of greloc in init_putv.

1 files changed, 12 insertions, 3 deletions

diff --git a/tccelf.c b/tccelf.c
index 02caa68..dc0a144 100644
--- a/tccelf.c
+++ b/tccelf.c
@@ -269,8 +269,8 @@ ST_FUNC int add_elf_sym(Section *s, addr_t value, unsigned long size,
 }
 
 /* put relocation */
-ST_FUNC void put_elf_reloc(Section *symtab, Section *s, unsigned long offset,
-                          int type, int symbol)
+ST_FUNC void put_elf_reloca(Section *symtab, Section *s, unsigned long offset,
+                            int type, int symbol, unsigned long addend)
 {
     char buf[256];
     Section *sr;
@@ -292,10 +292,19 @@ ST_FUNC void put_elf_reloc(Section *symtab, Section *s, unsigned long offset,
     rel->r_offset = offset;
     rel->r_info = ELFW(R_INFO)(symbol, type);
 #ifdef TCC_TARGET_X86_64
-    rel->r_addend = 0;
+    rel->r_addend = addend;
+#else
+    if (addend)
+        tcc_error("non-zero addend on REL architecture");
 #endif
 }
 
+ST_FUNC void put_elf_reloc(Section *symtab, Section *s, unsigned long offset,
+                           int type, int symbol)
+{
+    put_elf_reloca(symtab, s, offset, type, symbol, 0);
+}
+
 /* put stab debug information */
 
 ST_FUNC void put_stabs(const char *str, int type, int other, int desc,