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Make RGBLINK able to link SDCC object files

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This requires a LOT of tricky code, mostly due to the format itself being,
er, not the most straightforward.
Everything is converted to existing RGBLINK concepts (sections, patches,
etc.), so the core code is essentially unchanged.
(A couple of genuine RGBLINK bugs were uncovered along the way, so some of
the core code *is* changed, notably regarding `SECTION FRAGMENT`s.)

All of this code was clean-roomed, so SDCC's GPLv2 license does not apply.
This commit is contained in:
ISSOtm
2022-07-10 10:50:33 +02:00
committed by Eldred Habert
parent 1c2965467d
commit 828b2adcdf
16 changed files with 922 additions and 71 deletions
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41
src/link/object.c
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@@ -18,6 +18,7 @@
#include "link/main.h"
#include "link/object.h"
#include "link/patch.h"
#include "link/sdas_obj.h"
#include "link/section.h"
#include "link/symbol.h"
@@ -408,7 +409,7 @@ static void readSection(FILE *file, struct Section *section, char const *fileNam
* @param symbol The symbol to link
* @param section The section to link
*/
static void linkSymToSect(struct Symbol const *symbol, struct Section *section)
static void linkSymToSect(struct Symbol *symbol, struct Section *section)
{
uint32_t a = 0, b = section->nbSymbols;
@@ -421,7 +422,7 @@ static void linkSymToSect(struct Symbol const *symbol, struct Section *section)
a = c + 1;
}
struct Symbol const *tmp = symbol;
struct Symbol *tmp = symbol;
for (uint32_t i = a; i <= section->nbSymbols; i++) {
symbol = tmp;
@@ -466,6 +467,39 @@ void obj_ReadFile(char const *fileName, unsigned int fileID)
if (!file)
err("Could not open file %s", fileName);
// First, check if the object is a RGBDS object or a SDCC one. If the first byte is 'R',
// we'll assume it's a RGBDS object file, and otherwise, that it's a SDCC object file.
int c = getc(file);
ungetc(c, file); // Guaranteed to work
switch (c) {
case EOF:
fatal(NULL, 0, "File \"%s\" is empty!", fileName);
case 'R':
break;
default: // This is (probably) a SDCC object file, defer the rest of detection to it
// Since SDCC does not provide line info, everything will be reported as coming from the
// object file. It's better than nothing.
nodes[fileID].nbNodes = 1;
nodes[fileID].nodes = malloc(sizeof(nodes[fileID].nodes[0]) * nodes[fileID].nbNodes);
if (!nodes[fileID].nodes)
err("Failed to get memory for %s's nodes", fileName);
struct FileStackNode *where = &nodes[fileID].nodes[0];
if (!where)
fatal(NULL, 0, "Failed to alloc fstack node for \"%s\": %s", fileName, strerror(errno));
where->parent = NULL;
where->type = NODE_FILE;
where->name = strdup(fileName);
if (!where->name)
fatal(NULL, 0, "Failed to duplicate \"%s\"'s name: %s", fileName, strerror(errno));
sdobj_ReadFile(where, file);
return;
}
/* Begin by reading the magic bytes and version number */
unsigned versionNumber;
int matchedElems = fscanf(file, RGBDS_OBJECT_VERSION_STRING,
@@ -508,8 +542,7 @@ void obj_ReadFile(char const *fileName, unsigned int fileID)
readFileStackNode(file, nodes[fileID].nodes, i, fileName);
/* This file's symbols, kept to link sections to them */
struct Symbol **fileSymbols =
malloc(sizeof(*fileSymbols) * nbSymbols + 1);
struct Symbol **fileSymbols = malloc(sizeof(*fileSymbols) * nbSymbols + 1);
if (!fileSymbols)
err("Failed to get memory for %s's symbols", fileName);