RDOFF patch from Yuri Zaporogets:
- Panos Minos's LDRDF fix (correct export of relocation records); - Panos Minos's symtab.c verbose dump fix; - Librarian (rdflib) now puts a signature block when creating a library (instead of creating an empty file). In theory it doesn't break binary compatibility, but due to a bug in the original 'rdlib.c' you can't use old LDRDF with new libraries. Fix this bug as well. - Other minor changes in LDRDF.
This commit is contained in:
H. Peter Anvin
parent
87242df32d
commit
27cf503e03
7 changed files with 100 additions and 75 deletions
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@ -7,13 +7,9 @@
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*/
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/*
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* TODO: actually get this new version working!
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* - finish off write_output() - appears to be done
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* - implement library searching - appears to be done
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* - maybe we only want to do one pass, for performance reasons?
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* this makes things a little harder, but unix 'ld' copes...
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* - implement command line options - appears to be done
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* - improve symbol table implementation - done, thanks to Graeme Defty
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* TODO:
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* enhance search of required export symbols in libraries (now depends
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* on modules order in library)
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* - keep a cache of symbol names in each library module so
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* we don't have to constantly recheck the file
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* - general performance improvements
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@ -21,11 +17,8 @@
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* BUGS & LIMITATIONS: this program doesn't support multiple code, data
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* or bss segments, therefore for 16 bit programs whose code, data or BSS
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* segment exceeds 64K in size, it will not work. This program probably
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* wont work if compiled by a 16 bit compiler. Try DJGPP if you're running
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* won't work if compiled by a 16 bit compiler. Try DJGPP if you're running
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* under DOS. '#define STINGY_MEMORY' may help a little.
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*
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* TO FIX: enhance search of required export symbols in libraries (now depends
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* on modules order in library).
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*/
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#include <stdio.h>
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@ -39,7 +32,7 @@
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#include "rdlib.h"
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#include "segtab.h"
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#define LDRDF_VERSION "1.03"
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#define LDRDF_VERSION "1.04"
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#define RDF_MAXSEGS 64
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/* #define STINGY_MEMORY */
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@ -104,35 +97,6 @@ char * libpath = NULL;
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/* error file */
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static FILE * error_file;
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#ifdef _MULTBOOT_H
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/* loading address for multiboot header */
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unsigned MBHloadAddr;
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/*
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* Tiny code that moves RDF loader to its working memory region:
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* mov esi,SOURCE_ADDR ; BE xx xx xx xx
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* mov edi,DEST_ADDR ; BF xx xx xx xx
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* mov esp,edi ; 89 FC
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* push edi ; 57
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* mov ecx,RDFLDR_LENGTH/4 ; B9 xx xx xx xx
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* cld ; FC
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* rep movsd ; F3 A5
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* ret ; C3
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*/
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#define RDFLDR_LENGTH 4096 /* Loader will be moved to unused */
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#define RDFLDR_DESTLOC 0xBF000 /* video page */
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unsigned char RDFloaderMover[]={
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0xBE, 0, 0, 0, 0, 0xBF, 0, 0xF0, 0xB, 0,
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0x89, 0xFC, 0x57,
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0xB9, 0, 4, 0, 0,
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0xFC, 0xF3, 0xA5, 0xC3
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};
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#endif
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/* the header of the output file, built up stage by stage */
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rdf_headerbuf * newheader = NULL;
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@ -160,6 +124,29 @@ struct ldrdfoptions {
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int errorcount = 0; /* determines main program exit status */
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/*
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* Multiboot header support.
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*/
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/* loading address for multiboot header */
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unsigned MBHloadAddr;
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#define RDFLDR_LENGTH 4096 /* Loader size is 4K */
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#define RDFLDR_DESTLOC 0x100000 /* and its absolute address */
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/*
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* Tiny code that moves RDF setup code to its working memory region
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*/
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unsigned char trampoline_code[] = {
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0xBE, 0, 0, 0, 0, /* mov esi,SOURCE_ADDR */
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0xBF, 0, 0, 0, 0, /* mov edi,DEST_ADDR */
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0x89, 0xFA, /* mov edx,edi */
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0xB9, 0, 4, 0, 0, /* mov ecx,RDFLDR_LENGTH/4 */
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0xFC, /* cld */
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0xF3, 0xA5, /* rep movsd */
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0xFF, 0xE2 /* jmp edx */
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};
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/* =========================================================================
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* Utility functions
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*/
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@ -736,7 +723,7 @@ void write_output(const char * filename)
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hr = (rdfheaderrec *) malloc(sizeof(struct MultiBootHdrRec));
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hr->mbh.type = 9;
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hr->mbh.reclen = sizeof(struct tMultiBootHeader)+RDFLDRMOVER_SIZE;
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hr->mbh.reclen = sizeof(struct tMultiBootHeader)+TRAMPOLINESIZE;
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hr->mbh.mb.Magic = MB_MAGIC;
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hr->mbh.mb.Flags = MB_FL_KLUDGE;
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@ -745,7 +732,7 @@ void write_output(const char * filename)
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hr->mbh.mb.LoadAddr = MBHloadAddr;
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hr->mbh.mb.Entry = MBHloadAddr+16+sizeof(struct tMultiBootHeader);
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memcpy(hr->mbh.mover,RDFloaderMover,RDFLDRMOVER_SIZE);
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memcpy(hr->mbh.trampoline,trampoline_code,TRAMPOLINESIZE);
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rdfaddheader(rdfheader,hr);
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free(hr);
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@ -931,8 +918,17 @@ void write_output(const char * filename)
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* Otherwise, we need to output a new relocation record
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* with the references updated segment and offset...
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*/
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if (! isrelative
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|| cur->seginfo[localseg].dest_seg != seg)
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if (isrelative && cur->seginfo[localseg].dest_seg != seg)
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{
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hr->r.segment = cur->seginfo[localseg].dest_seg+64;
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hr->r.offset += cur->seginfo[localseg].reloc;
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hr->r.refseg = seg;
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rdfaddheader(rdfheader, hr);
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break;
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}
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if (! isrelative || cur->seginfo[localseg].dest_seg != seg)
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{
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hr->r.segment = cur->seginfo[localseg].dest_seg;
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hr->r.offset += cur->seginfo[localseg].reloc;
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@ -1094,11 +1090,14 @@ void write_output(const char * filename)
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struct MultiBootHdrRec *mbhrec = (struct MultiBootHdrRec *)(rdfheader->buf->buffer);
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unsigned l = membuflength(rdfheader->buf) + 14 +
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10*rdfheader->nsegments + rdfheader->seglength;
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unsigned *ldraddr = (unsigned *)(mbhrec->mover+1);
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unsigned *ldraddr = (unsigned *)(mbhrec->trampoline+1);
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unsigned *ldrdest = (unsigned *)(mbhrec->trampoline+6);
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mbhrec->mb.LoadEndAddr = MBHloadAddr+l+10+RDFLDR_LENGTH;
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mbhrec->mb.BSSendAddr = mbhrec->mb.LoadEndAddr;
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*ldraddr = MBHloadAddr+l+10;
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*ldrdest = RDFLDR_DESTLOC;
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}
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rdfwriteheader(f, rdfheader);
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@ -3,7 +3,13 @@
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/*
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* an rdoff library is simply a sequence of RDOFF object files, each
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* preceded by the name of the module, an ASCII string of up to 255
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* characters, terminated by a zero.
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* characters, terminated by a zero.
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*
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* When a library is being created, special signature block is placed
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* in the beginning of the file. It is a string 'RDLIB' followed by a
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* version number, then long content size and a long time stamp.
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* The module name of the signature block is '.sig'.
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*
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*
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* There may be an optional directory placed on the end of the file.
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* The format of the directory will be 'RDLDD' followed by a version
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@ -11,16 +17,17 @@
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* directory, the format of which has not yet been designed.
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* The module name of the directory must be '.dir'.
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*
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* All module names beginning with '.' are reserved
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* for possible future extensions. The linker ignores all such modules,
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* assuming they have the format of a six byte type & version identifier
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* followed by long content size, followed by data.
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* All module names beginning with '.' are reserved for possible future
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* extensions. The linker ignores all such modules, assuming they have
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* the format of a six byte type & version identifier followed by long
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* content size, followed by data.
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#include <time.h>
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/* functions supported:
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* create a library (no extra operands required)
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@ -41,6 +48,9 @@ const char *usage =
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" r - replace (module-name filename)\n"
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" d - delete (module-name)\n"
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" t - list\n";
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/* Library signature */
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const char *rdl_signature = "RDLIB2", *sig_modname = ".sig";
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char **_argv;
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@ -114,10 +124,11 @@ long copylong(FILE *fp, FILE *fp2)
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int main(int argc, char **argv)
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{
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FILE *fp, *fp2, *fptmp;
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FILE *fp, *fp2 = NULL, *fptmp;
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char *p, buf[256], c;
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int i;
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long l;
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time_t t;
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char tmptempl[L_tmpnam], rdbuf[10];
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_argv = argv;
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@ -137,6 +148,11 @@ int main(int argc, char **argv)
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perror("rdflib");
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exit(1);
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}
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fwrite(sig_modname, 1, strlen(sig_modname)+1, fp);
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fwrite(rdl_signature, 1, strlen(rdl_signature), fp);
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l = sizeof(t = time(NULL));
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fwrite(&l, sizeof(l), 1, fp);
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fwrite(&t, 1, l, fp);
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fclose(fp);
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break;
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@ -6,11 +6,13 @@
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#include "rdlib.h"
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/*
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* format of rdoff library files:
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* format of RDOFF library files:
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* optional signature ('.sig')
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* repeat
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* null terminated module name (max 255 chars)
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* RDOFF module
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* until eof
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* optional directory ('.dir')
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*/
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/*
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@ -54,26 +56,27 @@ int rdl_verify(const char * filename)
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i++;
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if (feof(fp)) break;
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fread(buf, 6, 1, fp);
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buf[6] = 0;
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if (buf[0] == '.') {
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/*
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* a special module, eg a directory.
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* A special module, eg a signature block or a directory.
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* Format of such a module is defined to be:
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* six char type identifier (which we've already read)
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* six char type identifier
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* long count bytes content
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* content
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* so we can handle it uniformaly with RDOFF2 modules...
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* do nothing here. :-)
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* so we can handle it uniformaly with RDOFF2 modules.
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*/
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fread(buf, 6, 1, fp);
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buf[6] = 0;
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/* Currently, nothing useful to do with signature block.. */
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} else {
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fread(buf, 6, 1, fp);
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buf[6] = 0;
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if (strncmp(buf, "RDOFF", 5)) {
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return rdl_error = lastresult = 2;
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} else if (buf[5] != '2') {
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return rdl_error = lastresult = 3;
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}
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}
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else if (strncmp(buf, "RDOFF", 5)) {
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return rdl_error = lastresult = 2;
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}
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else if (buf[5] != '2') {
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return rdl_error = lastresult = 3;
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}
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fread(&length, 4, 1, fp);
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fseek(fp, length, SEEK_CUR); /* skip over the module */
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}
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@ -481,7 +481,7 @@ int rdfaddheader(rdf_headerbuf * h, rdfheaderrec * r)
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#ifdef _MULTBOOT_H
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case 9: /* MultiBoot header */
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membufwrite(h->buf,&r->mbh.mb,sizeof(struct tMultiBootHeader)+RDFLDRMOVER_SIZE);
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membufwrite(h->buf,&r->mbh.mb,sizeof(struct tMultiBootHeader)+TRAMPOLINESIZE);
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break ;
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#endif
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@ -77,9 +77,11 @@ struct ModRec {
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#define SYM_FUNCTION 0x02
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#define SYM_GLOBAL 0x04
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/* Multiboot record */
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#ifdef _MULTBOOT_H
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#define RDFLDRMOVER_SIZE 22
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#define TRAMPOLINESIZE 22
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struct MultiBootHdrRec {
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byte type; /* must be 9 */
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@ -88,9 +90,10 @@ struct MultiBootHdrRec {
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struct tMultiBootHeader mb __attribute__ ((packed)); /* MultiBoot header */
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#else
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struct tMultiBootHeader mb;
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#endif
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byte mover[RDFLDRMOVER_SIZE]; /* Mover of RDF loader */
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#endif
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byte trampoline[TRAMPOLINESIZE];
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};
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#endif
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/* GenericRec - contains the type and length field, plus a 128 byte
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@ -117,10 +117,14 @@ symtabDump(void *stab, FILE* of)
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fprintf(of, " ... slot %d ...\n", i);
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}
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while(l) {
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fprintf(of, "%-32s %s:%08lx (%ld)\n",l->ent.name,
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SegNames[l->ent.segment],
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l->ent.offset, l->ent.flags);
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l = l->next;
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if ((l->ent.segment) == -1) {
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fprintf(of,"%-32s Unresolved reference\n",l->ent.name);
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} else {
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fprintf(of, "%-32s %s:%08lx (%ld)\n",l->ent.name,
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SegNames[l->ent.segment],
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l->ent.offset, l->ent.flags);
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}
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l = l->next;
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}
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}
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fprintf(of, "........... end of Symbol table.\n");
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@ -1,5 +1,5 @@
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#! /bin/sh
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[ $1 ] || {
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echo "Usage: $0 <library name> <module> [...]"
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exit 1
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