Mercurial > hg-old > index.cgi

changeset 119:8bc00221ae89

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
section order and address resolution done
author lost
date Wed, 21 Jan 2009 05:45:25 +0000
parents d450943305a7
children 36ce328df3c3
files lwlink/trunk/src/Makefile.am lwlink/trunk/src/link.c lwlink/trunk/src/lwlink.h lwlink/trunk/src/main.c lwlink/trunk/src/readfiles.c lwlink/trunk/src/script.c
diffstat 6 files changed, 163 insertions(+), 6 deletions(-) [+]
line wrap: on
line diff
--- a/lwlink/trunk/src/Makefile.am	Wed Jan 21 05:13:36 2009 +0000
+++ b/lwlink/trunk/src/Makefile.am	Wed Jan 21 05:45:25 2009 +0000
@@ -1,3 +1,3 @@
 bin_PROGRAMS = lwlink
-lwlink_SOURCES = main.c lwlink.c util.c readfiles.c expr.c script.c
+lwlink_SOURCES = main.c lwlink.c util.c readfiles.c expr.c script.c link.c
 EXTRA_DIST = lwlink.h util.h expr.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lwlink/trunk/src/link.c	Wed Jan 21 05:45:25 2009 +0000
@@ -0,0 +1,142 @@
+/*
+link.c
+Copyright © 2009 William Astle
+
+This file is part of LWLINK.
+
+LWLINK is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software
+Foundation, either version 3 of the License, or (at your option) any later
+version.
+
+This program is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+more details.
+
+You should have received a copy of the GNU General Public License along with
+this program. If not, see <http://www.gnu.org/licenses/>.
+
+
+Resolve section and symbol addresses; handle incomplete references
+*/
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stdlib.h>
+
+#include "lwlink.h"
+#include "util.h"
+
+struct section_list
+{
+	section_t *ptr;		// ptr to section structure
+	int forceaddr;		// was this force to an address by the link script?
+};
+
+static struct section_list *sectlist = NULL;
+static int nsects = 0;
+
+// work out section load order and resolve base addresses for each section
+// make a list of sections to load in order
+void resolve_sections(void)
+{
+	int laddr = 0;
+	int ln, sn, fn;
+	
+	for (ln = 0; ln < linkscript.nlines; ln++)
+	{
+		if (linkscript.lines[ln].sectname)
+		{
+			int f = 0;
+			// named section
+			// look for all instances of a section by the specified name
+			// and resolve base addresses and add to the list
+			for (fn = 0; fn < ninputfiles; fn++)
+			{
+				for (sn = 0; sn < inputfiles[fn] -> nsections; sn++)
+				{
+					if (!strcmp(linkscript.lines[ln].sectname, inputfiles[fn] -> sections[sn].name))
+					{
+						// we have a match
+						sectlist = lw_realloc(sectlist, sizeof(struct section_list) * (nsects + 1));
+						sectlist[nsects].ptr = &(inputfiles[fn] -> sections[sn]);
+						
+						inputfiles[fn] -> sections[sn].processed = 1;
+						if (!f && linkscript.lines[ln].loadat >= 0)
+						{
+							f = 1;
+							sectlist[nsects].forceaddr = 1;
+							laddr = linkscript.lines[ln].loadat;
+						}
+						else
+						{
+							sectlist[nsects].forceaddr = 0;
+						}
+						inputfiles[fn] -> sections[sn].loadaddress = laddr;
+						nsects++;
+					}
+				}
+			}
+		}
+		else
+		{
+			// wildcard section
+			// look for all sections not yet processed that match flags
+
+			int f = 0;
+			int fn0, sn0;
+			char *sname;
+			
+			// named section
+			// look for all instances of a section by the specified name
+			// and resolve base addresses and add to the list
+			for (fn0 = 0; fn0 < ninputfiles; fn0++)
+			{
+				for (sn0 = 0; sn0 < inputfiles[fn0] -> nsections; sn0++)
+				{
+					// ignore if the "no flags" bit says to
+					if (linkscript.lines[ln].noflags && (inputfiles[fn0] -> sections[sn0].flags & linkscript.lines[ln].noflags))
+						continue;
+					// ignore unless the yes flags tell us not to
+					if (linkscript.lines[ln].yesflags && (inputfiles[fn0] -> sections[sn0].flags & linkscript.lines[ln].yesflags == 0))
+						continue;
+					if (inputfiles[fn0] -> sections[sn0].processed == 0)
+					{
+						sname = inputfiles[fn0] -> sections[sn0].name;
+						for (fn = 0; fn < ninputfiles; fn++)
+						{
+							for (sn = 0; sn < inputfiles[fn] -> nsections; sn++)
+							{
+								if (!strcmp(sname, inputfiles[fn] -> sections[sn].name))
+								{
+									// we have a match
+									sectlist = lw_realloc(sectlist, sizeof(struct section_list) * (nsects + 1));
+									sectlist[nsects].ptr = &(inputfiles[fn] -> sections[sn]);
+						
+									inputfiles[fn] -> sections[sn].processed = 1;
+									if (!f && linkscript.lines[ln].loadat >= 0)
+									{
+										f = 1;
+										sectlist[nsects].forceaddr = 1;
+										laddr = linkscript.lines[ln].loadat;
+									}
+									else
+									{
+										sectlist[nsects].forceaddr = 0;
+									}
+									inputfiles[fn] -> sections[sn].loadaddress = laddr;
+									nsects++;
+								}
+							}
+						}
+					}
+				}
+			}
+		}
+	}
+	
+	// theoretically, all the base addresses are set now
+}
--- a/lwlink/trunk/src/lwlink.h	Wed Jan 21 05:13:36 2009 +0000
+++ b/lwlink/trunk/src/lwlink.h	Wed Jan 21 05:45:25 2009 +0000
@@ -46,6 +46,8 @@
 	reloc_t *next;			// ptr to next relocation
 };
 
+typedef struct fileinfo_s fileinfo_t;
+
 #define SECTION_BSS		1
 typedef struct
 {
@@ -54,14 +56,17 @@
 	int codesize;			// size of the code
 	unsigned char *code;	// pointer to the code
 	int loadaddress;		// the actual load address of the section
-	
+	int processed;			// was the section processed yet?
+		
 	symtab_t *localsyms;	// local symbol table
 	symtab_t *exportedsyms;	// exported symbols table
 	
 	reloc_t *incompletes;	// table of incomplete references
+	
+	fileinfo_t *file;		// the file we are in
 } section_t;
 
-typedef struct
+struct fileinfo_s
 {
 	char *filename;
 	unsigned char *filedata;
@@ -69,7 +74,7 @@
 	section_t *sections;
 	int nsections;
 	
-} fileinfo_t;
+};
 
 
 
--- a/lwlink/trunk/src/main.c	Wed Jan 21 05:13:36 2009 +0000
+++ b/lwlink/trunk/src/main.c	Wed Jan 21 05:45:25 2009 +0000
@@ -121,6 +121,7 @@
 
 extern void read_files(void);
 extern void setup_script(void);
+extern void resolve_sections(void);
 
 // main function; parse command line, set up assembler state, and run the
 // assembler on the first file
@@ -133,10 +134,14 @@
 		exit(1);
 	}
 
+	// handle the linker script
 	setup_script();
 
 	// read the input files
 	read_files();
 	
+	// resolve section bases and section order
+	resolve_sections();
+	
 	exit(0);
 }
--- a/lwlink/trunk/src/readfiles.c	Wed Jan 21 05:13:36 2009 +0000
+++ b/lwlink/trunk/src/readfiles.c	Wed Jan 21 05:45:25 2009 +0000
@@ -145,7 +145,9 @@
 		s -> localsyms = NULL;
 		s -> exportedsyms = NULL;
 		s -> incompletes = NULL;
-
+		s -> processed = 0;
+		s -> file = fn;
+		
 		// read flags
 		while (CURBYTE())
 		{
--- a/lwlink/trunk/src/script.c	Wed Jan 21 05:13:36 2009 +0000
+++ b/lwlink/trunk/src/script.c	Wed Jan 21 05:45:25 2009 +0000
@@ -220,7 +220,10 @@
 					exit(1);
 				}
 			}
-			linkscript.lines[linkscript.nlines].sectname = lw_strdup(ptr);
+			if (ptr[0] == '*' && ptr[1] == '\0')
+				linkscript.lines[linkscript.nlines].sectname = NULL;
+			else
+				linkscript.lines[linkscript.nlines].sectname = lw_strdup(ptr);
 			linkscript.nlines++;
 		}
 		else