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cc65/src/ld65/segments.c

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/*****************************************************************************/
/* */
/* segments.c */
/* */
/* Segment handling for the ld65 linker */
/* */
/* */
/* */
/* (C) 1998-2012, Ullrich von Bassewitz */
/* Roemerstrasse 52 */
/* D-70794 Filderstadt */
/* EMail: uz@cc65.org */
/* */
/* */
/* This software is provided 'as-is', without any expressed or implied */
/* warranty. In no event will the authors be held liable for any damages */
/* arising from the use of this software. */
/* */
/* Permission is granted to anyone to use this software for any purpose, */
/* including commercial applications, and to alter it and redistribute it */
/* freely, subject to the following restrictions: */
/* */
/* 1. The origin of this software must not be misrepresented; you must not */
/* claim that you wrote the original software. If you use this software */
/* in a product, an acknowledgment in the product documentation would be */
/* appreciated but is not required. */
/* 2. Altered source versions must be plainly marked as such, and must not */
/* be misrepresented as being the original software. */
/* 3. This notice may not be removed or altered from any source */
/* distribution. */
/* */
/*****************************************************************************/
#include <stdlib.h>
#include <string.h>
/* common */
#include "addrsize.h"
#include "alignment.h"
#include "check.h"
#include "coll.h"
#include "exprdefs.h"
#include "fragdefs.h"
#include "hashfunc.h"
#include "print.h"
#include "segdefs.h"
#include "symdefs.h"
#include "xmalloc.h"
/* ld65 */
#include "error.h"
#include "expr.h"
#include "fileio.h"
#include "fragment.h"
#include "global.h"
#include "lineinfo.h"
#include "segments.h"
#include "spool.h"
/*****************************************************************************/
/* Data */
/*****************************************************************************/
/* Hash table */
#define HASHTAB_MASK 0x3FU
#define HASHTAB_SIZE (HASHTAB_MASK + 1)
static Segment* HashTab[HASHTAB_SIZE];
/* List of all segments */
static Collection SegmentList = STATIC_COLLECTION_INITIALIZER;
/*****************************************************************************/
/* Code */
/*****************************************************************************/
static Segment* NewSegment (unsigned Name, unsigned char AddrSize)
/* Create a new segment and initialize it */
{
unsigned Hash;
/* Allocate memory */
Segment* S = xmalloc (sizeof (Segment));
/* Initialize the fields */
S->Name = Name;
S->Next = 0;
S->Flags = SEG_FLAG_NONE;
S->Sections = EmptyCollection;
S->MemArea = 0;
S->PC = 0;
S->Size = 0;
S->OutputName = 0;
S->OutputOffs = 0;
S->Alignment = 1;
S->FillVal = 0;
S->AddrSize = AddrSize;
S->ReadOnly = 0;
S->Dumped = 0;
/* Insert the segment into the segment list and assign the segment id */
S->Id = CollCount (&SegmentList);
CollAppend (&SegmentList, S);
/* Insert the segment into the segment hash list */
Hash = (S->Name & HASHTAB_MASK);
S->Next = HashTab[Hash];
HashTab[Hash] = S;
/* Return the new entry */
return S;
}
Segment* GetSegment (unsigned Name, unsigned char AddrSize, const char* ObjName)
/* Search for a segment and return an existing one. If the segment does not
** exist, create a new one and return that. ObjName is only used for the error
** message and may be NULL if the segment is linker generated.
*/
{
/* Try to locate the segment in the table */
Segment* S = SegFind (Name);
/* If we don't have that segment already, allocate it using the type of
** the first section.
*/
if (S == 0) {
/* Create a new segment */
S = NewSegment (Name, AddrSize);
} else {
/* Check if the existing segment has the requested address size */
if (S->AddrSize != AddrSize) {
/* Allow an empty object name */
if (ObjName == 0) {
ObjName = "[linker generated]";
}
Error ("Module '%s': Type mismatch for segment '%s'", ObjName,
GetString (Name));
}
}
/* Return the segment */
return S;
}
Section* NewSection (Segment* Seg, unsigned long Alignment, unsigned char AddrSize)
/* Create a new section for the given segment */
{
/* Allocate memory */
Section* S = xmalloc (sizeof (Section));
/* Initialize the data */
S->Next = 0;
S->Seg = Seg;
S->Obj = 0;
S->FragRoot = 0;
S->FragLast = 0;
S->Size = 0;
S->Alignment= Alignment;
S->AddrSize = AddrSize;
/* Calculate the alignment bytes needed for the section */
S->Fill = AlignCount (Seg->Size, S->Alignment);
/* Adjust the segment size and set the section offset */
Seg->Size += S->Fill;
S->Offs = Seg->Size; /* Current size is offset */
/* Insert the section into the segment */
CollAppend (&Seg->Sections, S);
/* Return the struct */
return S;
}
Section* ReadSection (FILE* F, ObjData* O)
/* Read a section from a file */
{
unsigned Name;
unsigned Size;
unsigned long Alignment;
unsigned char Type;
unsigned FragCount;
Segment* S;
Section* Sec;
/* Read the segment data */
(void) Read32 (F); /* File size of data */
Name = MakeGlobalStringId (O, ReadVar (F)); /* Segment name */
ReadVar (F); /* Segment flags (currently unused) */
Size = ReadVar (F); /* Size of data */
Alignment = ReadVar (F); /* Alignment */
Type = Read8 (F); /* Segment type */
FragCount = ReadVar (F); /* Number of fragments */
/* Print some data */
Print (stdout, 2,
"Module '%s': Found segment '%s', size = %u, alignment = %lu, type = %u\n",
GetObjFileName (O), GetString (Name), Size, Alignment, Type);
/* Get the segment for this section */
S = GetSegment (Name, Type, GetObjFileName (O));
/* Allocate the section we will return later */
Sec = NewSection (S, Alignment, Type);
/* Remember the object file this section was from */
Sec->Obj = O;
/* Set up the combined segment alignment */
if (Sec->Alignment > 1) {
Alignment = LeastCommonMultiple (S->Alignment, Sec->Alignment);
if (Alignment > MAX_ALIGNMENT) {
Error ("Combined alignment for segment '%s' is %lu which exceeds "
"%lu. Last module requiring alignment was '%s'.",
GetString (Name), Alignment, MAX_ALIGNMENT,
GetObjFileName (O));
} else if (Alignment >= LARGE_ALIGNMENT && Alignment > S->Alignment && Alignment > Sec->Alignment && !LargeAlignment) {
Warning ("Combined alignment for segment '%s' is suspiciously "
"large (%lu). Last module requiring alignment was '%s'.",
GetString (Name), Alignment, GetObjFileName (O));
}
S->Alignment = Alignment;
}
/* Start reading fragments from the file and insert them into the section . */
while (FragCount--) {
Fragment* Frag;
/* Read the fragment type */
unsigned char Type = Read8 (F);
/* Extract the check mask from the type */
unsigned char Bytes = Type & FRAG_BYTEMASK;
Type &= FRAG_TYPEMASK;
/* Handle the different fragment types */
switch (Type) {
case FRAG_LITERAL:
Frag = NewFragment (Type, ReadVar (F), Sec);
ReadData (F, Frag->LitBuf, Frag->Size);
break;
case FRAG_EXPR:
case FRAG_SEXPR:
Frag = NewFragment (Type, Bytes, Sec);
Frag->Expr = ReadExpr (F, O);
break;
case FRAG_FILL:
/* Will allocate memory, but we don't care... */
Frag = NewFragment (Type, ReadVar (F), Sec);
break;
default:
Error ("Unknown fragment type in module '%s', segment '%s': %02X",
GetObjFileName (O), GetString (S->Name), Type);
/* NOTREACHED */
return 0;
}
/* Read the line infos into the list of the fragment */
ReadLineInfoList (F, O, &Frag->LineInfos);
/* Remember the module we had this fragment from */
Frag->Obj = O;
}
/* Return the section */
return Sec;
}
Segment* SegFind (unsigned Name)
/* Return the given segment or NULL if not found. */
{
Segment* S = HashTab[Name & HASHTAB_MASK];
while (S) {
if (Name == S->Name) {
/* Found */
break;
}
S = S->Next;
}
/* Not found */
return S;
}
int IsBSSType (Segment* S)
/* Check if the given segment is a BSS style segment, that is, it does not
** contain non-zero data.
*/
{
/* Loop over all sections */
unsigned I;
for (I = 0; I < CollCount (&S->Sections); ++I) {
/* Get the next section */
Section* Sec = CollAtUnchecked (&S->Sections, I);
/* Loop over all fragments */
Fragment* F = Sec->FragRoot;
while (F) {
if (F->Type == FRAG_LITERAL) {
unsigned char* Data = F->LitBuf;
unsigned long Count = F->Size;
while (Count--) {
if (*Data++ != 0) {
return 0;
}
}
} else if (F->Type == FRAG_EXPR || F->Type == FRAG_SEXPR) {
if (GetExprVal (F->Expr) != 0) {
return 0;
}
}
F = F->Next;
}
}
return 1;
}
void SegDump (void)
/* Dump the segments and it's contents */
{
unsigned I, J;
unsigned long Count;
unsigned char* Data;
for (I = 0; I < CollCount (&SegmentList); ++I) {
Segment* Seg = CollAtUnchecked (&SegmentList, I);
printf ("Segment: %s (%lu)\n", GetString (Seg->Name), Seg->Size);
for (J = 0; J < CollCount (&Seg->Sections); ++J) {
Section* S = CollAtUnchecked (&Seg->Sections, J);
unsigned J;
Fragment* F = S->FragRoot;
printf (" Section:\n");
while (F) {
switch (F->Type) {
case FRAG_LITERAL:
printf (" Literal (%u bytes):", F->Size);
Count = F->Size;
Data = F->LitBuf;
J = 100;
while (Count--) {
if (J > 75) {
printf ("\n ");
J = 3;
}
printf (" %02X", *Data++);
J += 3;
}
printf ("\n");
break;
case FRAG_EXPR:
printf (" Expression (%u bytes):\n", F->Size);
printf (" ");
DumpExpr (F->Expr, 0);
break;
case FRAG_SEXPR:
printf (" Signed expression (%u bytes):\n", F->Size);
printf (" ");
DumpExpr (F->Expr, 0);
break;
case FRAG_FILL:
printf (" Empty space (%u bytes)\n", F->Size);
break;
default:
Internal ("Invalid fragment type: %02X", F->Type);
}
F = F->Next;
}
}
}
}
unsigned SegWriteConstExpr (FILE* F, ExprNode* E, int Signed, unsigned Size)
/* Write a supposedly constant expression to the target file. Do a range
** check and return one of the SEG_EXPR_xxx codes.
*/
{
static const unsigned long U_Hi[4] = {
0x000000FFUL, 0x0000FFFFUL, 0x00FFFFFFUL, 0xFFFFFFFFUL
};
static const long S_Hi[4] = {
0x0000007FL, 0x00007FFFL, 0x007FFFFFL, 0x7FFFFFFFL
};
static const long S_Lo[4] = {
~0x0000007FL, ~0x00007FFFL, ~0x007FFFFFL, ~0x7FFFFFFFL
};
/* Get the expression value */
long Val = GetExprVal (E);
/* Check the size */
CHECK (Size >= 1 && Size <= 4);
/* Check for a range error */
if (Signed) {
if (Val > S_Hi[Size-1] || Val < S_Lo[Size-1]) {
/* Range error */
return SEG_EXPR_RANGE_ERROR;
}
} else {
if (((unsigned long)Val) > U_Hi[Size-1]) {
/* Range error */
return SEG_EXPR_RANGE_ERROR;
}
}
/* Write the value to the file */
WriteVal (F, Val, Size);
/* Success */
return SEG_EXPR_OK;
}
void SegWrite (const char* TgtName, FILE* Tgt, Segment* S, SegWriteFunc F, void* Data)
/* Write the data from the given segment to a file. For expressions, F is
** called (see description of SegWriteFunc above).
*/
{
unsigned I;
int Sign;
unsigned long Offs = 0;
/* Remember the output file and offset for the segment */
S->OutputName = TgtName;
S->OutputOffs = (unsigned long) ftell (Tgt);
/* Loop over all sections in this segment */
for (I = 0; I < CollCount (&S->Sections); ++I) {
Section* Sec = CollAtUnchecked (&S->Sections, I);
Fragment* Frag;
unsigned char FillVal;
/* Output were this section is from */
Print (stdout, 2, " Section from \"%s\"\n", GetObjFileName (Sec->Obj));
/* If we have fill bytes, write them now. Beware: If this is the
** first section, the fill value is not considered part of the segment
** and therefore taken from the memory area.
*/
FillVal = (I == 0)? S->MemArea->FillVal : S->FillVal;
Print (stdout, 2, " Filling 0x%lx bytes with 0x%02x\n",
Sec->Fill, FillVal);
WriteMult (Tgt, FillVal, Sec->Fill);
Offs += Sec->Fill;
/* Loop over all fragments in this section */
Frag = Sec->FragRoot;
while (Frag) {
/* Output fragment data */
switch (Frag->Type) {
case FRAG_LITERAL:
WriteData (Tgt, Frag->LitBuf, Frag->Size);
break;
case FRAG_EXPR:
case FRAG_SEXPR:
Sign = (Frag->Type == FRAG_SEXPR);
/* Call the users function and evaluate the result */
switch (F (Frag->Expr, Sign, Frag->Size, Offs, Data)) {
case SEG_EXPR_OK:
break;
case SEG_EXPR_RANGE_ERROR:
Error ("Range error in module '%s', line %u",
GetFragmentSourceName (Frag),
GetFragmentSourceLine (Frag));
break;
case SEG_EXPR_TOO_COMPLEX:
Error ("Expression too complex in module '%s', line %u",
GetFragmentSourceName (Frag),
GetFragmentSourceLine (Frag));
break;
case SEG_EXPR_INVALID:
Error ("Invalid expression in module '%s', line %u",
GetFragmentSourceName (Frag),
GetFragmentSourceLine (Frag));
break;
default:
Internal ("Invalid return code from SegWriteFunc");
}
break;
case FRAG_FILL:
WriteMult (Tgt, S->FillVal, Frag->Size);
break;
default:
Internal ("Invalid fragment type: %02X", Frag->Type);
}
/* Update the offset */
Print (stdout, 2, " Fragment with 0x%x bytes\n",
Frag->Size);
Offs += Frag->Size;
/* Next fragment */
Frag = Frag->Next;
}
}
}
unsigned SegmentCount (void)
/* Return the total number of segments */
{
return CollCount (&SegmentList);
}
static int CmpSegStart (const void* K1, const void* K2)
/* Compare function for qsort */
{
/* Get the real segment pointers */
const Segment* S1 = *(const Segment**)K1;
const Segment* S2 = *(const Segment**)K2;
/* Compare the start addresses */
if (S1->PC > S2->PC) {
return 1;
} else if (S1->PC < S2->PC) {
return -1;
} else {
/* Sort segments with equal starts by name */
return strcmp (GetString (S1->Name), GetString (S2->Name));
}
}
void PrintSegmentMap (FILE* F)
/* Print a segment map to the given file */
{
/* Allocate memory for the segment pool */
Segment** SegPool = xmalloc (CollCount (&SegmentList) * sizeof (Segment*));
/* Copy the segment pointers */
unsigned I;
for (I = 0; I < CollCount (&SegmentList); ++I) {
SegPool[I] = CollAtUnchecked (&SegmentList, I);
}
/* Sort the array by increasing start addresses */
qsort (SegPool, CollCount (&SegmentList), sizeof (Segment*), CmpSegStart);
/* Print a header */
fprintf (F, "Name Start End Size Align\n"
"----------------------------------------------------\n");
/* Print the segments */
for (I = 0; I < CollCount (&SegmentList); ++I) {
/* Get a pointer to the segment */
Segment* S = SegPool[I];
/* Print empty segments only if explicitly requested */
if (VerboseMap || S->Size > 0) {
/* Print the segment data */
long End = S->PC + S->Size;
if (S->Size > 0) {
/* Point to last element addressed */
--End;
}
fprintf (F, "%-20s %06lX %06lX %06lX %05lX\n",
GetString (S->Name), S->PC, End, S->Size, S->Alignment);
}
}
/* Free the segment pool */
xfree (SegPool);
}
void PrintDbgSegments (FILE* F)
/* Output the segments to the debug file */
{
/* Walk over all segments */
unsigned I;
for (I = 0; I < CollCount (&SegmentList); ++I) {
/* Get the next segment */
const Segment* S = CollAtUnchecked (&SegmentList, I);
/* Print the segment data */
fprintf (F,
"seg\tid=%u,name=\"%s\",start=0x%06lX,size=0x%04lX,addrsize=%s,type=%s",
S->Id, GetString (S->Name), S->PC, S->Size,
AddrSizeToStr (S->AddrSize),
S->ReadOnly? "ro" : "rw");
if (S->OutputName) {
fprintf (F, ",oname=\"%s\",ooffs=%lu",
S->OutputName, S->OutputOffs);
}
fputc ('\n', F);
}
}
void CheckSegments (void)
/* Walk through the segment list and check if there are segments that were
** not written to the output file. Output an error if this is the case.
*/
{
unsigned I;
for (I = 0; I < CollCount (&SegmentList); ++I) {
/* Get the next segment */
const Segment* S = CollAtUnchecked (&SegmentList, I);
/* Check it */
if (S->Size > 0 && S->Dumped == 0) {
Error ("Missing memory area assignment for segment '%s'",
GetString (S->Name));
}
}
}
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