static rl78_bytesT rl78_bytes;
+void
+rl78_relax (int type, int pos)
+{
+ rl78_bytes.relax[rl78_bytes.n_relax].type = type;
+ rl78_bytes.relax[rl78_bytes.n_relax].field_pos = pos;
+ rl78_bytes.relax[rl78_bytes.n_relax].val_ofs = rl78_bytes.n_base + rl78_bytes.n_ops;
+ rl78_bytes.n_relax ++;
+}
+
void
rl78_linkrelax_addr16 (void)
{
rl78_parse ();
/* This simplifies the relaxation code. */
- if (rl78_bytes.link_relax)
+ if (rl78_bytes.n_relax || rl78_bytes.link_relax)
{
int olen = rl78_bytes.n_prefix + rl78_bytes.n_base + rl78_bytes.n_ops;
/* We do it this way because we want the frag to have the
- rl78_bytes in it, which we initialize above. */
- bytes = frag_more (olen);
+ rl78_bytes in it, which we initialize above. The extra bytes
+ are for relaxing. */
+ bytes = frag_more (olen + 3);
frag_then = frag_now;
frag_variant (rs_machine_dependent,
olen /* max_chars */,
}
}
-/* No relaxation just yet */
+\f
+/*----------------------------------------------------------------------*/
+/* To recap: we estimate everything based on md_estimate_size, then
+ adjust based on rl78_relax_frag. When it all settles, we call
+ md_convert frag to update the bytes. The relaxation types and
+ relocations are in fragP->tc_frag_data, which is a copy of that
+ rl78_bytes.
+
+ Our scheme is as follows: fr_fix has the size of the smallest
+ opcode (like BRA.S). We store the number of total bytes we need in
+ fr_subtype. When we're done relaxing, we use fr_subtype and the
+ existing opcode bytes to figure out what actual opcode we need to
+ put in there. If the fixup isn't resolvable now, we use the
+ maximal size. */
+
+#define TRACE_RELAX 0
+#define tprintf if (TRACE_RELAX) printf
+
+
+typedef enum
+{
+ OT_other,
+ OT_bt,
+ OT_bt_sfr,
+ OT_bt_es,
+ OT_bc,
+ OT_bh
+} op_type_T;
+
+/* We're looking for these types of relaxations:
+
+ BT 00110001 sbit0cc1 addr---- (cc is 10 (BF) or 01 (BT))
+ B~T 00110001 sbit0cc1 00000011 11101110 pcrel16- -------- (BR $!pcrel20)
+
+ BT sfr 00110001 sbit0cc0 sfr----- addr----
+ BT ES: 00010001 00101110 sbit0cc1 addr----
+
+ BC 110111cc addr----
+ B~C 110111cc 00000011 11101110 pcrel16- -------- (BR $!pcrel20)
+
+ BH 01100001 110c0011 00000011 11101110 pcrel16- -------- (BR $!pcrel20)
+ B~H 01100001 110c0011 00000011 11101110 pcrel16- -------- (BR $!pcrel20)
+*/
+
+/* Given the opcode bytes at OP, figure out which opcode it is and
+ return the type of opcode. We use this to re-encode the opcode as
+ a different size later. */
+
+static op_type_T
+rl78_opcode_type (char * op)
+{
+ if (op[0] == 0x31
+ && ((op[1] & 0x0f) == 0x05
+ || (op[1] & 0x0f) == 0x03))
+ return OT_bt;
+
+ if (op[0] == 0x31
+ && ((op[1] & 0x0f) == 0x04
+ || (op[1] & 0x0f) == 0x02))
+ return OT_bt_sfr;
+
+ if (op[0] == 0x11
+ && op[1] == 0x31
+ && ((op[2] & 0x0f) == 0x05
+ || (op[2] & 0x0f) == 0x03))
+ return OT_bt_es;
+
+ if ((op[0] & 0xfc) == 0xdc)
+ return OT_bc;
+
+ if (op[0] == 0x61
+ && (op[1] & 0xef) == 0xc3)
+ return OT_bh;
+
+ return OT_other;
+}
+
+/* Returns zero if *addrP has the target address. Else returns nonzero
+ if we cannot compute the target address yet. */
+
+static int
+rl78_frag_fix_value (fragS * fragP,
+ segT segment,
+ int which,
+ addressT * addrP,
+ int need_diff,
+ addressT * sym_addr)
+{
+ addressT addr = 0;
+ rl78_bytesT * b = fragP->tc_frag_data;
+ expressionS * exp = & b->fixups[which].exp;
+
+ if (need_diff && exp->X_op != O_subtract)
+ return 1;
+
+ if (exp->X_add_symbol)
+ {
+ if (S_FORCE_RELOC (exp->X_add_symbol, 1))
+ return 1;
+ if (S_GET_SEGMENT (exp->X_add_symbol) != segment)
+ return 1;
+ addr += S_GET_VALUE (exp->X_add_symbol);
+ }
+
+ if (exp->X_op_symbol)
+ {
+ if (exp->X_op != O_subtract)
+ return 1;
+ if (S_FORCE_RELOC (exp->X_op_symbol, 1))
+ return 1;
+ if (S_GET_SEGMENT (exp->X_op_symbol) != segment)
+ return 1;
+ addr -= S_GET_VALUE (exp->X_op_symbol);
+ }
+ if (sym_addr)
+ * sym_addr = addr;
+ addr += exp->X_add_number;
+ * addrP = addr;
+ return 0;
+}
+
+/* Estimate how big the opcode is after this relax pass. The return
+ value is the difference between fr_fix and the actual size. We
+ compute the total size in rl78_relax_frag and store it in fr_subtype,
+ sowe only need to subtract fx_fix and return it. */
+
int
md_estimate_size_before_relax (fragS * fragP ATTRIBUTE_UNUSED, segT segment ATTRIBUTE_UNUSED)
{
- return 0;
+ int opfixsize;
+ int delta;
+
+ /* This is the size of the opcode that's accounted for in fr_fix. */
+ opfixsize = fragP->fr_fix - (fragP->fr_opcode - fragP->fr_literal);
+ /* This is the size of the opcode that isn't. */
+ delta = (fragP->fr_subtype - opfixsize);
+
+ tprintf (" -> opfixsize %d delta %d\n", opfixsize, delta);
+ return delta;
+}
+
+/* Given the new addresses for this relax pass, figure out how big
+ each opcode must be. We store the total number of bytes needed in
+ fr_subtype. The return value is the difference between the size
+ after the last pass and the size after this pass, so we use the old
+ fr_subtype to calculate the difference. */
+
+int
+rl78_relax_frag (segT segment ATTRIBUTE_UNUSED, fragS * fragP, long stretch)
+{
+ addressT addr0, sym_addr;
+ addressT mypc;
+ int disp;
+ int oldsize = fragP->fr_subtype;
+ int newsize = oldsize;
+ op_type_T optype;
+ int ri;
+
+ mypc = fragP->fr_address + (fragP->fr_opcode - fragP->fr_literal);
+
+ /* If we ever get more than one reloc per opcode, this is the one
+ we're relaxing. */
+ ri = 0;
+
+ optype = rl78_opcode_type (fragP->fr_opcode);
+ /* Try to get the target address. */
+ if (rl78_frag_fix_value (fragP, segment, ri, & addr0,
+ fragP->tc_frag_data->relax[ri].type != RL78_RELAX_BRANCH,
+ & sym_addr))
+ {
+ /* If we don't, we must use the maximum size for the linker. */
+ switch (fragP->tc_frag_data->relax[ri].type)
+ {
+ case RL78_RELAX_BRANCH:
+ switch (optype)
+ {
+ case OT_bt:
+ newsize = 6;
+ break;
+ case OT_bt_sfr:
+ case OT_bt_es:
+ newsize = 7;
+ break;
+ case OT_bc:
+ newsize = 5;
+ break;
+ case OT_bh:
+ newsize = 6;
+ break;
+ case OT_other:
+ newsize = oldsize;
+ break;
+ }
+ break;
+
+ }
+ fragP->fr_subtype = newsize;
+ tprintf (" -> new %d old %d delta %d (external)\n", newsize, oldsize, newsize-oldsize);
+ return newsize - oldsize;
+ }
+
+ if (sym_addr > mypc)
+ addr0 += stretch;
+
+ switch (fragP->tc_frag_data->relax[ri].type)
+ {
+ case RL78_RELAX_BRANCH:
+ disp = (int) addr0 - (int) mypc;
+
+ switch (optype)
+ {
+ case OT_bt:
+ if (disp >= -128 && (disp - (oldsize-2)) <= 127)
+ newsize = 3;
+ else
+ newsize = 6;
+ break;
+ case OT_bt_sfr:
+ case OT_bt_es:
+ if (disp >= -128 && (disp - (oldsize-3)) <= 127)
+ newsize = 4;
+ else
+ newsize = 7;
+ break;
+ case OT_bc:
+ if (disp >= -128 && (disp - (oldsize-1)) <= 127)
+ newsize = 2;
+ else
+ newsize = 5;
+ break;
+ case OT_bh:
+ if (disp >= -128 && (disp - (oldsize-2)) <= 127)
+ newsize = 3;
+ else
+ newsize = 6;
+ break;
+ case OT_other:
+ newsize = oldsize;
+ break;
+ }
+ break;
+ }
+
+ /* This prevents infinite loops in align-heavy sources. */
+ if (newsize < oldsize)
+ {
+ if (fragP->tc_frag_data->times_shrank > 10
+ && fragP->tc_frag_data->times_grown > 10)
+ newsize = oldsize;
+ if (fragP->tc_frag_data->times_shrank < 20)
+ fragP->tc_frag_data->times_shrank ++;
+ }
+ else if (newsize > oldsize)
+ {
+ if (fragP->tc_frag_data->times_grown < 20)
+ fragP->tc_frag_data->times_grown ++;
+ }
+
+ fragP->fr_subtype = newsize;
+ tprintf (" -> new %d old %d delta %d\n", newsize, oldsize, newsize-oldsize);
+ return newsize - oldsize;
+ }
+
+/* This lets us test for the opcode type and the desired size in a
+ switch statement. */
+#define OPCODE(type,size) ((type) * 16 + (size))
+
+/* Given the opcode stored in fr_opcode and the number of bytes we
+ think we need, encode a new opcode. We stored a pointer to the
+ fixup for this opcode in the tc_frag_data structure. If we can do
+ the fixup here, we change the relocation type to "none" (we test
+ for that in tc_gen_reloc) else we change it to the right type for
+ the new (biggest) opcode. */
+
+void
+md_convert_frag (bfd * abfd ATTRIBUTE_UNUSED,
+ segT segment ATTRIBUTE_UNUSED,
+ fragS * fragP ATTRIBUTE_UNUSED)
+{
+ rl78_bytesT * rl78b = fragP->tc_frag_data;
+ addressT addr0, mypc;
+ int disp;
+ int reloc_type, reloc_adjust;
+ char * op = fragP->fr_opcode;
+ int keep_reloc = 0;
+ int ri;
+ int fi = (rl78b->n_fixups > 1) ? 1 : 0;
+ fixS * fix = rl78b->fixups[fi].fixP;
+
+ /* If we ever get more than one reloc per opcode, this is the one
+ we're relaxing. */
+ ri = 0;
+
+ /* We used a new frag for this opcode, so the opcode address should
+ be the frag address. */
+ mypc = fragP->fr_address + (fragP->fr_opcode - fragP->fr_literal);
+ tprintf("\033[32mmypc: 0x%x\033[0m\n", (int)mypc);
+
+ /* Try to get the target address. If we fail here, we just use the
+ largest format. */
+ if (rl78_frag_fix_value (fragP, segment, 0, & addr0,
+ fragP->tc_frag_data->relax[ri].type != RL78_RELAX_BRANCH, 0))
+ {
+ /* We don't know the target address. */
+ keep_reloc = 1;
+ addr0 = 0;
+ disp = 0;
+ tprintf ("unknown addr ? - %x = ?\n", (int)mypc);
+ }
+ else
+ {
+ /* We know the target address, and it's in addr0. */
+ disp = (int) addr0 - (int) mypc;
+ tprintf ("known addr %x - %x = %d\n", (int)addr0, (int)mypc, disp);
+ }
+
+ if (linkrelax)
+ keep_reloc = 1;
+
+ reloc_type = BFD_RELOC_NONE;
+ reloc_adjust = 0;
+
+ switch (fragP->tc_frag_data->relax[ri].type)
+ {
+ case RL78_RELAX_BRANCH:
+ switch (OPCODE (rl78_opcode_type (fragP->fr_opcode), fragP->fr_subtype))
+ {
+
+ case OPCODE (OT_bt, 3): /* BT A,$ - no change. */
+ disp -= 3;
+ op[2] = disp;
+ break;
+
+ case OPCODE (OT_bt, 6): /* BT A,$ - long version. */
+ disp -= 3;
+ op[1] ^= 0x06; /* toggle conditional. */
+ op[2] = 3; /* displacement over long branch. */
+ disp -= 3;
+ op[3] = 0xEE; /* BR $!addr20 */
+ op[4] = disp & 0xff;
+ op[5] = disp >> 8;
+ reloc_type = keep_reloc ? BFD_RELOC_16_PCREL : BFD_RELOC_NONE;
+ reloc_adjust = 2;
+ break;
+
+ case OPCODE (OT_bt_sfr, 4): /* BT PSW,$ - no change. */
+ disp -= 4;
+ op[3] = disp;
+ break;
+
+ case OPCODE (OT_bt_sfr, 7): /* BT PSW,$ - long version. */
+ disp -= 4;
+ op[1] ^= 0x06; /* toggle conditional. */
+ op[3] = 3; /* displacement over long branch. */
+ disp -= 3;
+ op[4] = 0xEE; /* BR $!addr20 */
+ op[5] = disp & 0xff;
+ op[6] = disp >> 8;
+ reloc_type = keep_reloc ? BFD_RELOC_16_PCREL : BFD_RELOC_NONE;
+ reloc_adjust = 2;
+ break;
+
+ case OPCODE (OT_bt_es, 4): /* BT ES:[HL],$ - no change. */
+ disp -= 4;
+ op[3] = disp;
+ break;
+
+ case OPCODE (OT_bt_es, 7): /* BT PSW,$ - long version. */
+ disp -= 4;
+ op[2] ^= 0x06; /* toggle conditional. */
+ op[3] = 3; /* displacement over long branch. */
+ disp -= 3;
+ op[4] = 0xEE; /* BR $!addr20 */
+ op[5] = disp & 0xff;
+ op[6] = disp >> 8;
+ reloc_type = keep_reloc ? BFD_RELOC_16_PCREL : BFD_RELOC_NONE;
+ reloc_adjust = 2;
+ break;
+
+ case OPCODE (OT_bc, 2): /* BC $ - no change. */
+ disp -= 2;
+ op[1] = disp;
+ break;
+
+ case OPCODE (OT_bc, 5): /* BC $ - long version. */
+ disp -= 2;
+ op[0] ^= 0x02; /* toggle conditional. */
+ op[1] = 3;
+ disp -= 3;
+ op[2] = 0xEE; /* BR $!addr20 */
+ op[3] = disp & 0xff;
+ op[4] = disp >> 8;
+ reloc_type = keep_reloc ? BFD_RELOC_16_PCREL : BFD_RELOC_NONE;
+ reloc_adjust = 2;
+ break;
+
+ case OPCODE (OT_bh, 3): /* BH $ - no change. */
+ disp -= 3;
+ op[2] = disp;
+ break;
+
+ case OPCODE (OT_bh, 6): /* BC $ - long version. */
+ disp -= 3;
+ op[1] ^= 0x10; /* toggle conditional. */
+ op[2] = 3;
+ disp -= 3;
+ op[3] = 0xEE; /* BR $!addr20 */
+ op[4] = disp & 0xff;
+ op[5] = disp >> 8;
+ reloc_type = keep_reloc ? BFD_RELOC_16_PCREL : BFD_RELOC_NONE;
+ reloc_adjust = 2;
+ break;
+
+ default:
+ fprintf(stderr, "Missed case %d %d at 0x%lx\n",
+ rl78_opcode_type (fragP->fr_opcode), fragP->fr_subtype, mypc);
+ abort ();
+
+ }
+ break;
+
+ default:
+ if (rl78b->n_fixups)
+ {
+ reloc_type = fix->fx_r_type;
+ reloc_adjust = 0;
+ }
+ break;
+ }
+
+ if (rl78b->n_fixups)
+ {
+
+ fix->fx_r_type = reloc_type;
+ fix->fx_where += reloc_adjust;
+ switch (reloc_type)
+ {
+ case BFD_RELOC_NONE:
+ fix->fx_size = 0;
+ break;
+ case BFD_RELOC_8:
+ fix->fx_size = 1;
+ break;
+ case BFD_RELOC_16_PCREL:
+ fix->fx_size = 2;
+ break;
+ }
+ }
+
+ fragP->fr_fix = fragP->fr_subtype + (fragP->fr_opcode - fragP->fr_literal);
+ tprintf ("fragP->fr_fix now %ld (%d + (%p - %p)\n", (long) fragP->fr_fix,
+ fragP->fr_subtype, fragP->fr_opcode, fragP->fr_literal);
+ fragP->fr_var = 0;
+
+ tprintf ("compare 0x%lx vs 0x%lx - 0x%lx = 0x%lx (%p)\n",
+ (long)fragP->fr_fix,
+ (long)fragP->fr_next->fr_address, (long)fragP->fr_address,
+ (long)(fragP->fr_next->fr_address - fragP->fr_address),
+ fragP->fr_next);
+
+ if (fragP->fr_next != NULL
+ && ((offsetT) (fragP->fr_next->fr_address - fragP->fr_address)
+ != fragP->fr_fix))
+ as_bad (_("bad frag at %p : fix %ld addr %ld %ld \n"), fragP,
+ (long) fragP->fr_fix,
+ (long) fragP->fr_address, (long) fragP->fr_next->fr_address);
}
+/* End of relaxation code.
+ ----------------------------------------------------------------------*/
+\f
+
arelent **
tc_gen_reloc (asection * seg ATTRIBUTE_UNUSED, fixS * fixp)
{
int align = bfd_get_section_alignment (stdoutput, segment);
return ((size + (1 << align) - 1) & (-1 << align));
}
-
-void
-md_convert_frag (bfd * abfd ATTRIBUTE_UNUSED,
- segT segment ATTRIBUTE_UNUSED,
- fragS * fragP ATTRIBUTE_UNUSED)
-{
- /* No relaxation yet */
- fragP->fr_var = 0;
-}
projects / binutils-gdb.git / commitdiff