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Add support for declaring elf visibility attributes. Used to
help cleanup TEXTRELs in misc libraries (like libsdl).
Syntax to declare function foo hidden:
GLOBAL foo:function:hidden
Patch by Mike Frysinger <vapier@gentoo.org>
http://sourceforge.net/mailarchive/forum.php?thread_id=9230919&forum_id=4978
--- nasm/output/outelf.c
+++ nasm/output/outelf.c
@@ -50,6 +50,7 @@ struct Symbol {
long strpos; /* string table position of name */
long section; /* section ID of the symbol */
int type; /* symbol type */
+ int other; /* symbol visibility */
long value; /* address, or COMMON variable align */
long size; /* size of symbol */
long globnum; /* symbol table offset if global */
@@ -113,9 +114,15 @@ extern struct ofmt of_elf;
#define SYM_SECTION 0x04
#define SYM_GLOBAL 0x10
+#define SYM_NOTYPE 0x00
#define SYM_DATA 0x01
#define SYM_FUNCTION 0x02
+#define STV_DEFAULT 0
+#define STV_INTERNAL 1
+#define STV_HIDDEN 2
+#define STV_PROTECTED 3
+
#define GLOBAL_TEMP_BASE 16 /* bigger than any constant sym id */
#define SEG_ALIGN 16 /* alignment of sections in file */
@@ -493,6 +500,7 @@ static void elf_deflabel(char *name, lon
sym->strpos = pos;
sym->type = is_global ? SYM_GLOBAL : 0;
+ sym->other = STV_DEFAULT;
sym->size = 0;
if (segment == NO_SEG)
sym->section = SHN_ABS;
@@ -571,16 +579,40 @@ static void elf_deflabel(char *name, lon
sects[sym->section - 1]->gsyms = sym;
if (special) {
- int n = strcspn(special, " ");
+ char *visibility = NULL;
+ int n;
+ n = strcspn(special, ":");
+ if (special[n]) {
+ visibility = special + n + 1;
+ } else
+ n = strcspn(special, " ");
if (!nasm_strnicmp(special, "function", n))
sym->type |= SYM_FUNCTION;
else if (!nasm_strnicmp(special, "data", n) ||
!nasm_strnicmp(special, "object", n))
sym->type |= SYM_DATA;
+ else if (!nasm_strnicmp(special, "notype", n))
+ sym->type |= SYM_NOTYPE;
else
error(ERR_NONFATAL, "unrecognised symbol type `%.*s'",
n, special);
+ if (visibility) {
+ n = strcspn(visibility, " ");
+ if (!nasm_strnicmp(visibility, "default", n))
+ sym->other = STV_DEFAULT;
+ else if (!nasm_strnicmp(visibility, "internal", n))
+ sym->other = STV_INTERNAL;
+ else if (!nasm_strnicmp(visibility, "hidden", n))
+ sym->other = STV_HIDDEN;
+ else if (!nasm_strnicmp(visibility, "protected", n))
+ sym->other = STV_PROTECTED;
+ else
+ error(ERR_NONFATAL, "unrecognised symbol type `%.*s'",
+ n, visibility);
+ n = strcspn(special, " ");
+ }
+
if (special[n]) {
struct tokenval tokval;
expr *e;
@@ -1120,7 +1152,8 @@ static struct SAA *elf_build_symtab(long
WRITELONG(p, sym->strpos);
WRITELONG(p, sym->value);
WRITELONG(p, sym->size);
- WRITESHORT(p, sym->type); /* local non-typed thing */
+ WRITECHAR(p, sym->type); /* local non-typed thing */
+ WRITECHAR(p, sym->other);
WRITESHORT(p, sym->section);
saa_wbytes(s, entry, 16L);
*len += 16;
@@ -1138,7 +1171,8 @@ static struct SAA *elf_build_symtab(long
WRITELONG(p, sym->strpos);
WRITELONG(p, sym->value);
WRITELONG(p, sym->size);
- WRITESHORT(p, sym->type); /* global non-typed thing */
+ WRITECHAR(p, sym->type); /* global non-typed thing */
+ WRITECHAR(p, sym->other);
WRITESHORT(p, sym->section);
saa_wbytes(s, entry, 16L);
*len += 16;
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