diff options
Diffstat (limited to 'gas/config/tc-sh.c')
| -rw-r--r-- | gas/config/tc-sh.c | 169 |
1 files changed, 127 insertions, 42 deletions
diff --git a/gas/config/tc-sh.c b/gas/config/tc-sh.c index 4003f5b..d468215 100644 --- a/gas/config/tc-sh.c +++ b/gas/config/tc-sh.c @@ -244,14 +244,12 @@ static int reg_x, reg_y; static int reg_efg; static int reg_b; -static expressionS immediate; /* absolute expression */ - typedef struct { sh_arg_type type; int reg; + expressionS immediate; } - sh_operand_info; #define IDENT_CHAR(c) (isalnum (c) || (c) == '_') @@ -466,7 +464,9 @@ parse_reg (src, mode, reg) } if (src[0] == 'p' && src[1] == 'c' && ! IDENT_CHAR ((unsigned char) src[2])) { - *mode = A_DISP_PC; + /* Don't use A_DISP_PC here - that would accept stuff like 'mova pc,r0' + and use an uninitialized immediate. */ + *mode = A_PC; return 2; } if (src[0] == 'g' && src[1] == 'b' && src[2] == 'r' @@ -619,16 +619,17 @@ static symbolS *dot() static char * -parse_exp (s) +parse_exp (s, op) char *s; + sh_operand_info *op; { char *save; char *new; save = input_line_pointer; input_line_pointer = s; - expression (&immediate); - if (immediate.X_op == O_absent) + expression (&op->immediate); + if (op->immediate.X_op == O_absent) as_bad (_("missing operand")); new = input_line_pointer; input_line_pointer = save; @@ -710,7 +711,7 @@ parse_at (src, op) else { /* Must be an @(disp,.. thing) */ - src = parse_exp (src); + src = parse_exp (src, op); if (src[0] == ',') src++; /* Now can be rn, gbr or pc */ @@ -725,12 +726,12 @@ parse_at (src, op) { op->type = A_DISP_GBR; } - else if (mode == A_DISP_PC) + else if (mode == A_PC) { /* Turn a plain @(4,pc) into @(.+4,pc) */ - if (immediate.X_op == O_constant) { - immediate.X_add_symbol = dot(); - immediate.X_op = O_symbol; + if (op->immediate.X_op == O_constant) { + op->immediate.X_add_symbol = dot(); + op->immediate.X_op = O_symbol; } op->type = A_DISP_PC; } @@ -795,7 +796,7 @@ get_operand (ptr, op) if (src[0] == '#') { src++; - *ptr = parse_exp (src); + *ptr = parse_exp (src, op); op->type = A_IMM; return; } @@ -815,7 +816,7 @@ get_operand (ptr, op) else { /* Not a reg, the only thing left is a displacement */ - *ptr = parse_exp (src); + *ptr = parse_exp (src, op); op->type = A_DISP_PC; return; } @@ -1177,22 +1178,24 @@ check (operand, low, high) static void -insert (where, how, pcrel) +insert (where, how, pcrel, op) char *where; int how; int pcrel; + sh_operand_info *op; { fix_new_exp (frag_now, where - frag_now->fr_literal, 2, - &immediate, + &op->immediate, pcrel, how); } static void -build_relax (opcode) +build_relax (opcode, op) sh_opcode_info *opcode; + sh_operand_info *op; { int high_byte = target_big_endian ? 0 : 1; char *p; @@ -1204,8 +1207,8 @@ build_relax (opcode) md_relax_table[C (what, COND32)].rlx_length, md_relax_table[C (what, COND8)].rlx_length, C (what, 0), - immediate.X_add_symbol, - immediate.X_add_number, + op->immediate.X_add_symbol, + op->immediate.X_add_number, 0); p[high_byte] = (opcode->nibbles[0] << 4) | (opcode->nibbles[1]); } @@ -1215,14 +1218,63 @@ build_relax (opcode) md_relax_table[C (UNCOND_JUMP, UNCOND32)].rlx_length, md_relax_table[C (UNCOND_JUMP, UNCOND12)].rlx_length, C (UNCOND_JUMP, 0), - immediate.X_add_symbol, - immediate.X_add_number, + op->immediate.X_add_symbol, + op->immediate.X_add_number, 0); p[high_byte] = (opcode->nibbles[0] << 4); } } +/* insert ldrs & ldre with fancy relocations that relaxation can recognize. */ +static char * +insert_loop_bounds (output, operand) + char *output; + sh_operand_info *operand; +{ + char *name; + symbolS *end_sym; + + /* Since the low byte of the opcode will be overwritten by the reloc, we + can just stash the high byte into both bytes and ignore endianness. */ + output[0] = 0x8c; + output[1] = 0x8c; + insert (output, BFD_RELOC_SH_LOOP_START, 1, operand); + insert (output, BFD_RELOC_SH_LOOP_END, 1, operand + 1); + + if (sh_relax) + { + static int count = 0; + + /* If the last loop insn is a two-byte-insn, it is in danger of being + swapped with the insn after it. To prevent this, create a new + symbol - complete with SH_LABEL reloc - after the last loop insn. + If the last loop insn is four bytes long, the symbol will be + right in the middle, but four byte insns are not swapped anyways. */ + /* A REPEAT takes 6 bytes. The SH has a 32 bit address space. + Hence a 9 digit number should be enough to count all REPEATs. */ + name = alloca (11); + sprintf (name, "_R%x", count++ & 0x3fffffff); + end_sym = symbol_new (name, undefined_section, 0, &zero_address_frag); + /* Make this a local symbol. */ +#ifdef OBJ_COFF + SF_SET_LOCAL (end_sym); +#endif /* OBJ_COFF */ + symbol_table_insert (end_sym); + end_sym->sy_value = operand[1].immediate; + end_sym->sy_value.X_add_number += 2; + fix_new (frag_now, frag_now_fix (), 2, end_sym, 0, 1, BFD_RELOC_SH_LABEL); + } + + output = frag_more (2); + output[0] = 0x8e; + output[1] = 0x8e; + insert (output, BFD_RELOC_SH_LOOP_START, 1, operand); + insert (output, BFD_RELOC_SH_LOOP_END, 1, operand + 1); + + return frag_more (2); +} + /* Now we know what sort of opcodes it is, lets build the bytes - */ static void @@ -1268,32 +1320,52 @@ build_Mytes (opcode, operand) case REG_B: nbuf[index] = reg_b | 0x08; break; - case DISP_4: - insert (output + low_byte, BFD_RELOC_SH_IMM4, 0); + case IMM0_4BY4: + insert (output + low_byte, BFD_RELOC_SH_IMM4BY4, 0, operand); + break; + case IMM0_4BY2: + insert (output + low_byte, BFD_RELOC_SH_IMM4BY2, 0, operand); + break; + case IMM0_4: + insert (output + low_byte, BFD_RELOC_SH_IMM4, 0, operand); + break; + case IMM1_4BY4: + insert (output + low_byte, BFD_RELOC_SH_IMM4BY4, 0, operand + 1); + break; + case IMM1_4BY2: + insert (output + low_byte, BFD_RELOC_SH_IMM4BY2, 0, operand + 1); break; - case IMM_4BY4: - insert (output + low_byte, BFD_RELOC_SH_IMM4BY4, 0); + case IMM1_4: + insert (output + low_byte, BFD_RELOC_SH_IMM4, 0, operand + 1); break; - case IMM_4BY2: - insert (output + low_byte, BFD_RELOC_SH_IMM4BY2, 0); + case IMM0_8BY4: + insert (output + low_byte, BFD_RELOC_SH_IMM8BY4, 0, operand); break; - case IMM_4: - insert (output + low_byte, BFD_RELOC_SH_IMM4, 0); + case IMM0_8BY2: + insert (output + low_byte, BFD_RELOC_SH_IMM8BY2, 0, operand); break; - case IMM_8BY4: - insert (output + low_byte, BFD_RELOC_SH_IMM8BY4, 0); + case IMM0_8: + insert (output + low_byte, BFD_RELOC_SH_IMM8, 0, operand); break; - case IMM_8BY2: - insert (output + low_byte, BFD_RELOC_SH_IMM8BY2, 0); + case IMM1_8BY4: + insert (output + low_byte, BFD_RELOC_SH_IMM8BY4, 0, operand + 1); break; - case IMM_8: - insert (output + low_byte, BFD_RELOC_SH_IMM8, 0); + case IMM1_8BY2: + insert (output + low_byte, BFD_RELOC_SH_IMM8BY2, 0, operand + 1); + break; + case IMM1_8: + insert (output + low_byte, BFD_RELOC_SH_IMM8, 0, operand + 1); break; case PCRELIMM_8BY4: - insert (output, BFD_RELOC_SH_PCRELIMM8BY4, 1); + insert (output, BFD_RELOC_SH_PCRELIMM8BY4, 1, operand); break; case PCRELIMM_8BY2: - insert (output, BFD_RELOC_SH_PCRELIMM8BY2, 1); + insert (output, BFD_RELOC_SH_PCRELIMM8BY2, 1, operand); + break; + case REPEAT: + output = insert_loop_bounds (output, operand); + nbuf[index] = opcode->nibbles[3]; + operand += 2; break; default: printf (_("failed for %d\n"), i); @@ -1457,10 +1529,10 @@ assemble_ppi (op_end, opcode) break; case PSH: - if (immediate.X_op != O_constant) + if (operand[0].immediate.X_op != O_constant) as_bad (_("dsp immediate shift value not constant")); field_b = ((opcode->nibbles[2] << 12) - | (immediate.X_add_number & 127) << 4 + | (operand[0].immediate.X_add_number & 127) << 4 | reg_n); break; case PPI3: @@ -1604,8 +1676,8 @@ md_assemble (str) if (opcode->arg[0] == A_BDISP12 || opcode->arg[0] == A_BDISP8) { - parse_exp (op_end + 1); - build_relax (opcode); + parse_exp (op_end + 1, &operand[0]); + build_relax (opcode, &operand[0]); } else { @@ -2407,7 +2479,9 @@ sh_force_relocation (fix) { if (fix->fx_r_type == BFD_RELOC_VTABLE_INHERIT - || fix->fx_r_type == BFD_RELOC_VTABLE_ENTRY) + || fix->fx_r_type == BFD_RELOC_VTABLE_ENTRY + || fix->fx_r_type == BFD_RELOC_SH_LOOP_START + || fix->fx_r_type == BFD_RELOC_SH_LOOP_END) return 1; if (! sh_relax) @@ -2643,6 +2717,9 @@ md_apply_fix (fixP, val) /* Nothing to do here. */ break; + case BFD_RELOC_SH_LOOP_START: + case BFD_RELOC_SH_LOOP_END: + case BFD_RELOC_VTABLE_INHERIT: case BFD_RELOC_VTABLE_ENTRY: fixP->fx_done = 0; @@ -2993,6 +3070,14 @@ tc_gen_reloc (section, fixp) else if (r_type == BFD_RELOC_VTABLE_INHERIT || r_type == BFD_RELOC_VTABLE_ENTRY) rel->addend = fixp->fx_offset; + else if (r_type == BFD_RELOC_SH_LOOP_START + || r_type == BFD_RELOC_SH_LOOP_END) + rel->addend = fixp->fx_offset; + else if (r_type == BFD_RELOC_SH_LABEL && fixp->fx_pcrel) + { + rel->addend = 0; + rel->address = rel->addend = fixp->fx_offset; + } else if (fixp->fx_pcrel) rel->addend = fixp->fx_addnumber; else |