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Added support for arbitrary alignments.

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git-svn-id: svn://svn.cc65.org/cc65/trunk@5341 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
uz
2011-12-28 16:28:19 +00:00
parent 5bcbb39bba
commit 6ead4abf24
8 changed files with 88 additions and 75 deletions
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50
src/ld65/config.c
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@@ -6,7 +6,7 @@
/* */
/* */
/* */
/* (C) 1998-2010, Ullrich von Bassewitz */
/* (C) 1998-2011, Ullrich von Bassewitz */
/* Roemerstrasse 52 */
/* D-70794 Filderstadt */
/* EMail: uz@cc65.org */
@@ -47,6 +47,7 @@
#include "xsprintf.h"
/* ld65 */
#include "alignment.h"
#include "bin.h"
#include "binfmt.h"
#include "cfgexpr.h"
@@ -340,12 +341,13 @@ static SegDesc* NewSegDesc (unsigned Name)
S = xmalloc (sizeof (SegDesc));
/* Initialize the fields */
S->Name = Name;
S->LI = GenLineInfo (&CfgErrorPos);
S->Seg = 0;
S->Attr = 0;
S->Flags = 0;
S->Align = 0;
S->Name = Name;
S->LI = GenLineInfo (&CfgErrorPos);
S->Seg = 0;
S->Attr = 0;
S->Flags = 0;
S->RunAlignment = 1;
S->LoadAlignment = 1;
/* Insert the struct into the list ... */
CollAppend (&SegDescList, S);
@@ -637,7 +639,6 @@ static void ParseSegments (void)
};
unsigned Count;
long Val;
/* The MEMORY section must preceed the SEGMENTS section */
if ((SectionsEncountered & SE_MEMORY) == 0) {
@@ -672,21 +673,13 @@ static void ParseSegments (void)
case CFGTOK_ALIGN:
FlagAttr (&S->Attr, SA_ALIGN, "ALIGN");
Val = CfgCheckedConstExpr (1, 0x10000);
S->Align = BitFind (Val);
if ((0x01L << S->Align) != Val) {
CfgError (&CfgErrorPos, "Alignment must be a power of 2");
}
S->RunAlignment = (unsigned) CfgCheckedConstExpr (1, MAX_ALIGNMENT);
S->Flags |= SF_ALIGN;
break;
case CFGTOK_ALIGN_LOAD:
FlagAttr (&S->Attr, SA_ALIGN_LOAD, "ALIGN_LOAD");
Val = CfgCheckedConstExpr (1, 0x10000);
S->AlignLoad = BitFind (Val);
if ((0x01L << S->AlignLoad) != Val) {
CfgError (&CfgErrorPos, "Alignment must be a power of 2");
}
S->LoadAlignment = (unsigned) CfgCheckedConstExpr (1, MAX_ALIGNMENT);
S->Flags |= SF_ALIGN_LOAD;
break;
@@ -1818,8 +1811,22 @@ unsigned CfgProcess (void)
*/
if (S->Flags & SF_ALIGN) {
/* Align the address */
unsigned long Val = (0x01UL << S->Align) - 1;
Addr = (Addr + Val) & ~Val;
unsigned long NewAddr = AlignAddr (Addr, S->RunAlignment);
/* If the first segment placed in the memory area needs
* fill bytes for the alignment, emit a warning, since
* this is somewhat suspicious.
*/
if (M->FillLevel == 0 && NewAddr > Addr) {
CfgWarning (GetSourcePos (S->LI),
"First segment in memory area `%s' does "
"already need fill bytes for alignment",
GetString (M->Name));
}
/* Use the aligned address */
Addr = NewAddr;
} else if (S->Flags & (SF_OFFSET | SF_START)) {
/* Give the segment a fixed starting address */
unsigned long NewAddr = S->Addr;
@@ -1862,8 +1869,7 @@ unsigned CfgProcess (void)
*/
if (S->Flags & SF_ALIGN_LOAD) {
/* Align the address */
unsigned long Val = (0x01UL << S->AlignLoad) - 1;
Addr = (Addr + Val) & ~Val;
Addr = AlignAddr (Addr, S->LoadAlignment);
}
}