From c1936da94269bf0a909310f2ec57aea818eabb70 Mon Sep 17 00:00:00 2001
From: Cyrill Gorcunov <gorcunov@gmail.com>
Date: Wed, 6 Apr 2011 18:32:15 +0400
Subject: [PATCH] ofmt: Alias shortname must be used for __OUTPUT_FORMAT__
 macro

__OUTPUT_FORMAT__ must consist of shortname of output format
or its alias, otherwise userspace ABI gets broken.

For example source code still can refer to __OUTPUT_FORMAT__=elf,
instead of __OUTPUT_FORMAT__=elf32.

BR3246990

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
---
 nasm.c           | 12 +++++++++---
 nasm.h           | 11 ++++++++++-
 output/outform.c | 10 +++++++---
 output/outform.h | 10 +++-------
 4 files changed, 29 insertions(+), 14 deletions(-)

diff --git a/nasm.c b/nasm.c
index c0a105b0..36be46e4 100644
--- a/nasm.c
+++ b/nasm.c
@@ -1,6 +1,6 @@
 /* ----------------------------------------------------------------------- *
  *
- *   Copyright 1996-2010 The NASM Authors - All Rights Reserved
+ *   Copyright 1996-2011 The NASM Authors - All Rights Reserved
  *   See the file AUTHORS included with the NASM distribution for
  *   the specific copyright holders.
  *
@@ -98,6 +98,7 @@ static char errname[FILENAME_MAX];
 static int globallineno;        /* for forward-reference tracking */
 /* static int pass = 0; */
 struct ofmt *ofmt = &OF_DEFAULT;
+struct ofmt_alias *ofmt_alias = NULL;
 const struct dfmt *dfmt;
 
 static FILE *error_file;        /* Where to write error messages */
@@ -268,8 +269,13 @@ static void define_macros_late(void)
 {
     char temp[128];
 
+    /*
+     * In case if output format is defined by alias
+     * we have to put shortname of the alias itself here
+     * otherwise ABI backward compatibility gets broken.
+     */
     snprintf(temp, sizeof(temp), "__OUTPUT_FORMAT__=%s",
-	     ofmt->shortname);
+             ofmt_alias ? ofmt_alias->shortname : ofmt->shortname);
     pp_pre_define(temp);
 }
 
@@ -652,7 +658,7 @@ static bool process_arg(char *p, char *q)
 	    break;
 
 	case 'f':		/* output format */
-	    ofmt = ofmt_find(param);
+        ofmt = ofmt_find(param, &ofmt_alias);
 	    if (!ofmt) {
 		nasm_error(ERR_FATAL | ERR_NOFILE | ERR_USAGE,
 			     "unrecognised output format `%s' - "
diff --git a/nasm.h b/nasm.h
index f78ed0fc..ff77553e 100644
--- a/nasm.h
+++ b/nasm.h
@@ -1,6 +1,6 @@
 /* ----------------------------------------------------------------------- *
  *   
- *   Copyright 1996-2009 The NASM Authors - All Rights Reserved
+ *   Copyright 1996-2011 The NASM Authors - All Rights Reserved
  *   See the file AUTHORS included with the NASM distribution for
  *   the specific copyright holders.
  *
@@ -754,6 +754,15 @@ struct ofmt {
     void (*cleanup) (int debuginfo);
 };
 
+/*
+ * Output format driver alias
+ */
+struct ofmt_alias {
+    const char  *shortname;
+    const char  *fullname;
+    struct ofmt *ofmt;
+};
+
 extern struct ofmt *ofmt;
 extern FILE *ofile;
 
diff --git a/output/outform.c b/output/outform.c
index e386343e..0c8ae53b 100644
--- a/output/outform.c
+++ b/output/outform.c
@@ -1,6 +1,6 @@
 /* ----------------------------------------------------------------------- *
  *   
- *   Copyright 1996-2009 The NASM Authors - All Rights Reserved
+ *   Copyright 1996-2011 The NASM Authors - All Rights Reserved
  *   See the file AUTHORS included with the NASM distribution for
  *   the specific copyright holders.
  *
@@ -47,11 +47,13 @@
 #define BUILD_DRIVERS_ARRAY
 #include "output/outform.h"
 
-struct ofmt *ofmt_find(char *name)
+struct ofmt *ofmt_find(char *name, struct ofmt_alias **ofmt_alias)
 {
     struct ofmt **ofp, *of;
     unsigned int i;
 
+    *ofmt_alias = NULL;
+
     /* primary targets first */
     for (ofp = drivers; (of = *ofp); ofp++) {
         if (!nasm_stricmp(name, of->shortname))
@@ -61,8 +63,10 @@ struct ofmt *ofmt_find(char *name)
     /* lets walk thru aliases then */
     for (i = 0; i < ARRAY_SIZE(ofmt_aliases); i++) {
         if (ofmt_aliases[i].shortname &&
-            !nasm_stricmp(name, ofmt_aliases[i].shortname))
+            !nasm_stricmp(name, ofmt_aliases[i].shortname)) {
+            *ofmt_alias = &ofmt_aliases[i];
             return ofmt_aliases[i].ofmt;
+        }
     }
 
     return NULL;
diff --git a/output/outform.h b/output/outform.h
index e703d99c..4b809b7b 100644
--- a/output/outform.h
+++ b/output/outform.h
@@ -1,6 +1,6 @@
 /* ----------------------------------------------------------------------- *
  *
- *   Copyright 1996-2009 The NASM Authors - All Rights Reserved
+ *   Copyright 1996-2011 The NASM Authors - All Rights Reserved
  *   See the file AUTHORS included with the NASM distribution for
  *   the specific copyright holders.
  *
@@ -330,11 +330,7 @@ static struct ofmt *drivers[] = {
     NULL
 };
 
-static struct ofmt_alias {
-    const char *shortname;
-    const char *fullname;
-    struct ofmt *ofmt;
-} ofmt_aliases[] = {
+static struct ofmt_alias ofmt_aliases[] = {
 #ifdef OF_ELF32
     {
         "elf",
@@ -361,7 +357,7 @@ static struct ofmt_alias {
 
 #endif /* BUILD_DRIVERS_ARRAY */
 
-struct ofmt *ofmt_find(char *);
+struct ofmt *ofmt_find(char *name, struct ofmt_alias **ofmt_alias);
 struct dfmt *dfmt_find(struct ofmt *, char *);
 void ofmt_list(struct ofmt *, FILE *);
 void dfmt_list(struct ofmt *ofmt, FILE * fp);
-- 
2.11.4.GIT