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Relocate the data in the type encodings space.

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Because of the way it is used, the data in the type encodings space needs
to always be correct (ie, relocated), even for partially linked object
files.
This commit is contained in:
Bill Currie 2012-11-14 20:37:19 +09:00
parent 453ac11bc3
commit 39c1034afb
1 changed files with 53 additions and 21 deletions
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74
tools/qfcc/source/linker.c
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@ -434,23 +434,26 @@ static int
add_relocs (qfo_t *qfo, int start, int count, int target)
{
int size;
qfo_reloc_t *reloc;
qfo_reloc_t *ireloc;
qfo_reloc_t *oreloc;
size = work->num_relocs + count;
work->relocs = realloc (work->relocs, size * sizeof (qfo_reloc_t));
memcpy (work->relocs + work->num_relocs, qfo->relocs + start,
count * sizeof (qfo_reloc_t));
while (work->num_relocs < size) {
reloc = work->relocs + work->num_relocs++;
if (reloc->space < 0 || reloc->space >= qfo->num_spaces) {
linker_error ("bad reloc space: %d (%d)", reloc->space,
ireloc = qfo->relocs + start;
oreloc = work->relocs + work->num_relocs;
for ( ; work->num_relocs < size; ireloc++, oreloc++) {
*oreloc = *ireloc;
ireloc->type = -1;
ireloc->offset = work->num_relocs++;
if (oreloc->space < 0 || oreloc->space >= qfo->num_spaces) {
linker_error ("bad reloc space: %d (%d)", oreloc->space,
qfo->num_spaces);
reloc->type = rel_none;
oreloc->type = rel_none;
continue;
}
reloc->space = qfo->spaces[reloc->space].id;
adjust_reloc_offset (reloc);
reloc->target = target;
oreloc->space = qfo->spaces[oreloc->space].id;
adjust_reloc_offset (oreloc);
oreloc->target = target;
}
return work->num_relocs - count;
}
@ -477,6 +480,8 @@ add_defs (qfo_t *qfo, qfo_mspace_t *space, qfo_mspace_t *dest_space,
*odef = *idef; // copy the def data
odef->name = linker_add_string (QFOSTR (qfo, idef->name));
odef->file = linker_add_string (QFOSTR (qfo, idef->file));
idef->file = -1; // mark def as copied
idef->line = num_work_defrefs; // so def can be found
type = QFOTYPE(idef->type);
odef->type = type->t.class; // pointer to type in work
if (odef->flags & QFOD_EXTERNAL && !odef->num_relocs)
@ -776,6 +781,23 @@ type_def_compare (const void *a, const void *b)
return 0;
}
static void
update_type_space_reloc (qfo_mspace_t *space, qfo_reloc_t *reloc)
{
qfo_def_t dummy;
qfo_def_t *def;
if (reloc->type == -1)
reloc = work->relocs + reloc->offset;
dummy.offset = reloc->offset;
def = (qfo_def_t *) bsearch (&dummy, space->defs, space->num_defs,
sizeof (qfo_def_t), type_def_compare);
if (!def)
linker_internal_error ("relocation record with invalid address. "
"corrupt object file?");
reloc->offset += def->type - def->offset;
}
static int
process_type_space (qfo_t *qfo, qfo_mspace_t *space, int pass)
{
@ -797,21 +819,20 @@ process_type_space (qfo_t *qfo, qfo_mspace_t *space, int pass)
qsort (space->defs, space->num_defs, sizeof (qfo_def_t), type_def_compare);
// update the offsets of all relocation records that point into the type
// encoding space
// encoding space.
for (i = 0; i < qfo->num_relocs; i++) {
qfo_reloc_t *reloc = qfo->relocs + i;
qfo_def_t dummy;
qfo_def_t *def;
if (reloc->space != space->id)
continue;
dummy.offset = reloc->offset;
def = (qfo_def_t *) bsearch (&dummy, space->defs, space->num_defs,
sizeof (qfo_def_t), type_def_compare);
if (!def)
linker_internal_error ("relocation record with invalid address. "
"corrupt object file?");
reloc->offset += def->type - def->offset;
update_type_space_reloc (space, reloc);
// while we're at it, update the strings so the type space strings
// are always correct.
if (reloc->type == rel_def_string) {
string_t str;
str = linker_add_string (QFOSTR (qfo, reloc->target));
QFO_STRING (work, reloc->space, reloc->offset) = str;
}
}
for (i = 0; i < num_builtins; i++) {
builtin_sym_t *bi = builtin_symbols + i;
@ -1255,6 +1276,17 @@ build_qfo (void)
reloc++;
}
}
for (i = 0; i < qfo->num_relocs; i++) {
qfo_def_t *def;
reloc = qfo->relocs + i;
if (reloc->space != qfo_type_space)
continue;
if (reloc->type != rel_def_def)
continue;
def = qfo->defs + reloc->target;
QFO_INT (qfo, reloc->space, reloc->offset) = def->offset;
}
return qfo;
}