From 4d68580a998c736345f698b314fb48052efd449f Mon Sep 17 00:00:00 2001 From: Richard Sandiford Date: Sun, 23 Sep 2012 09:31:14 +0000 Subject: [PATCH] gas/ * config/tc-mips.c (read_insn, write_insn, read_compressed_insn): New functions. (install_insn, md_apply_fix, md_convert_frag, mips_handle_align): Use them, and write_compressed_insn. --- gas/ChangeLog | 7 ++ gas/config/tc-mips.c | 252 ++++++++++++++++++++++----------------------------- 2 files changed, 115 insertions(+), 144 deletions(-) diff --git a/gas/ChangeLog b/gas/ChangeLog index 9172532..da66b49 100644 --- a/gas/ChangeLog +++ b/gas/ChangeLog @@ -1,5 +1,12 @@ 2012-09-23 Richard Sandiford + * config/tc-mips.c (read_insn, write_insn, read_compressed_insn): + New functions. + (install_insn, md_apply_fix, md_convert_frag, mips_handle_align): + Use them, and write_compressed_insn. + +2012-09-23 Richard Sandiford + * config/tc-mips.c (mips_cl_insn): Remove use_extend and extend. (MIPS16_EXTEND): New macro. (mips16_opcode_length): New function. diff --git a/gas/config/tc-mips.c b/gas/config/tc-mips.c index 480f1b7..885aaf8 100644 --- a/gas/config/tc-mips.c +++ b/gas/config/tc-mips.c @@ -1686,6 +1686,49 @@ mips_record_compressed_mode (void) si->tc_segment_info_data.micromips = mips_opts.micromips; } +/* Read a standard MIPS instruction from BUF. */ + +static unsigned long +read_insn (char *buf) +{ + if (target_big_endian) + return bfd_getb32 ((bfd_byte *) buf); + else + return bfd_getl32 ((bfd_byte *) buf); +} + +/* Write standard MIPS instruction INSN to BUF. Return a pointer to + the next byte. */ + +static char * +write_insn (char *buf, unsigned int insn) +{ + md_number_to_chars (buf, insn, 4); + return buf + 4; +} + +/* Read a microMIPS or MIPS16 opcode from BUF, given that it + has length LENGTH. */ + +static unsigned long +read_compressed_insn (char *buf, unsigned int length) +{ + unsigned long insn; + unsigned int i; + + insn = 0; + for (i = 0; i < length; i += 2) + { + insn <<= 16; + if (target_big_endian) + insn |= bfd_getb16 ((char *) buf); + else + insn |= bfd_getl16 ((char *) buf); + buf += 2; + } + return insn; +} + /* Write microMIPS or MIPS16 instruction INSN to BUF, given that the instruction is LENGTH bytes long. Return a pointer to the next byte. */ @@ -1708,7 +1751,7 @@ install_insn (const struct mips_cl_insn *insn) if (HAVE_CODE_COMPRESSION) write_compressed_insn (f, insn->insn_opcode, insn_length (insn)); else - md_number_to_chars (f, insn->insn_opcode, 4); + write_insn (f, insn->insn_opcode); mips_record_compressed_mode (); } @@ -15382,7 +15425,7 @@ mips_force_relocation (fixS *fixp) void md_apply_fix (fixS *fixP, valueT *valP, segT seg ATTRIBUTE_UNUSED) { - bfd_byte *buf; + char *buf; long insn; reloc_howto_type *howto; @@ -15402,7 +15445,7 @@ md_apply_fix (fixS *fixP, valueT *valP, segT seg ATTRIBUTE_UNUSED) || fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY || fixP->fx_r_type == BFD_RELOC_MIPS_TLS_DTPREL64); - buf = (bfd_byte *) (fixP->fx_frag->fr_literal + fixP->fx_where); + buf = fixP->fx_frag->fr_literal + fixP->fx_where; gas_assert (!fixP->fx_pcrel || fixP->fx_r_type == BFD_RELOC_16_PCREL_S2 || fixP->fx_r_type == BFD_RELOC_MICROMIPS_7_PCREL_S1 @@ -15513,7 +15556,7 @@ md_apply_fix (fixS *fixP, valueT *valP, segT seg ATTRIBUTE_UNUSED) if (fixP->fx_done) { if (8 <= sizeof (valueT)) - md_number_to_chars ((char *) buf, *valP, 8); + md_number_to_chars (buf, *valP, 8); else { valueT hiv; @@ -15522,10 +15565,8 @@ md_apply_fix (fixS *fixP, valueT *valP, segT seg ATTRIBUTE_UNUSED) hiv = 0xffffffff; else hiv = 0; - md_number_to_chars ((char *)(buf + (target_big_endian ? 4 : 0)), - *valP, 4); - md_number_to_chars ((char *)(buf + (target_big_endian ? 0 : 4)), - hiv, 4); + md_number_to_chars (buf + (target_big_endian ? 4 : 0), *valP, 4); + md_number_to_chars (buf + (target_big_endian ? 0 : 4), hiv, 4); } } break; @@ -15537,7 +15578,7 @@ md_apply_fix (fixS *fixP, valueT *valP, segT seg ATTRIBUTE_UNUSED) value now. This can happen if we have a .word which is not resolved when it appears but is later defined. */ if (fixP->fx_done) - md_number_to_chars ((char *) buf, *valP, fixP->fx_size); + md_number_to_chars (buf, *valP, fixP->fx_size); break; case BFD_RELOC_LO16: @@ -15557,7 +15598,7 @@ md_apply_fix (fixS *fixP, valueT *valP, segT seg ATTRIBUTE_UNUSED) of endianness. */ if (target_big_endian || fixP->fx_r_type == BFD_RELOC_MICROMIPS_LO16) buf += 2; - md_number_to_chars ((char *) buf, *valP, 2); + md_number_to_chars (buf, *valP, 2); } break; @@ -15573,15 +15614,12 @@ md_apply_fix (fixS *fixP, valueT *valP, segT seg ATTRIBUTE_UNUSED) break; /* Update old instruction data. */ - if (target_big_endian) - insn = (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3]; - else - insn = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0]; + insn = read_insn (buf); if (*valP + 0x20000 <= 0x3ffff) { insn |= (*valP >> 2) & 0xffff; - md_number_to_chars ((char *) buf, insn, 4); + write_insn (buf, insn); } else if (mips_pic == NO_PIC && fixP->fx_done @@ -15603,7 +15641,7 @@ md_apply_fix (fixS *fixP, valueT *valP, segT seg ATTRIBUTE_UNUSED) fixP->fx_done = 0; fixP->fx_addsy = section_symbol (text_section); *valP += md_pcrel_from (fixP); - md_number_to_chars ((char *) buf, insn, 4); + write_insn (buf, insn); } else { @@ -17750,17 +17788,13 @@ md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED, segT asec, fragS *fragp) { if (RELAX_BRANCH_P (fragp->fr_subtype)) { - bfd_byte *buf; + char *buf; unsigned long insn; expressionS exp; fixS *fixp; - buf = (bfd_byte *)fragp->fr_literal + fragp->fr_fix; - - if (target_big_endian) - insn = bfd_getb32 (buf); - else - insn = bfd_getl32 (buf); + buf = fragp->fr_literal + fragp->fr_fix; + insn = read_insn (buf); if (!RELAX_BRANCH_TOOFAR (fragp->fr_subtype)) { @@ -17771,13 +17805,12 @@ md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED, segT asec, fragS *fragp) exp.X_add_symbol = fragp->fr_symbol; exp.X_add_number = fragp->fr_offset; - fixp = fix_new_exp (fragp, buf - (bfd_byte *)fragp->fr_literal, - 4, &exp, TRUE, BFD_RELOC_16_PCREL_S2); + fixp = fix_new_exp (fragp, buf - fragp->fr_literal, 4, &exp, TRUE, + BFD_RELOC_16_PCREL_S2); fixp->fx_file = fragp->fr_file; fixp->fx_line = fragp->fr_line; - md_number_to_chars ((char *) buf, insn, 4); - buf += 4; + buf = write_insn (buf, insn); } else { @@ -17838,7 +17871,7 @@ md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED, segT asec, fragS *fragp) else { /* How many bytes in instructions we've already emitted? */ - i = buf - (bfd_byte *)fragp->fr_literal - fragp->fr_fix; + i = buf - fragp->fr_literal - fragp->fr_fix; /* How many bytes in instructions from here to the end? */ i = fragp->fr_var - i; } @@ -17848,12 +17881,10 @@ md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED, segT asec, fragS *fragp) i--; insn |= i; /* Branch over the jump. */ - md_number_to_chars ((char *) buf, insn, 4); - buf += 4; + buf = write_insn (buf, insn); /* nop */ - md_number_to_chars ((char *) buf, 0, 4); - buf += 4; + buf = write_insn (buf, 0); if (RELAX_BRANCH_LIKELY (fragp->fr_subtype)) { @@ -17862,20 +17893,17 @@ md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED, segT asec, fragS *fragp) /* Compute the PC offset from the current instruction to the end of the variable frag. */ /* How many bytes in instructions we've already emitted? */ - i = buf - (bfd_byte *)fragp->fr_literal - fragp->fr_fix; + i = buf - fragp->fr_literal - fragp->fr_fix; /* How many bytes in instructions from here to the end? */ i = fragp->fr_var - i; /* Convert to instruction count. */ i >>= 2; /* Don't decrement i, because we want to branch over the delay slot. */ - insn |= i; - md_number_to_chars ((char *) buf, insn, 4); - buf += 4; - md_number_to_chars ((char *) buf, 0, 4); - buf += 4; + buf = write_insn (buf, insn); + buf = write_insn (buf, 0); } uncond: @@ -17888,13 +17916,12 @@ md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED, segT asec, fragS *fragp) exp.X_add_symbol = fragp->fr_symbol; exp.X_add_number = fragp->fr_offset; - fixp = fix_new_exp (fragp, buf - (bfd_byte *)fragp->fr_literal, - 4, &exp, FALSE, BFD_RELOC_MIPS_JMP); + fixp = fix_new_exp (fragp, buf - fragp->fr_literal, 4, &exp, + FALSE, BFD_RELOC_MIPS_JMP); fixp->fx_file = fragp->fr_file; fixp->fx_line = fragp->fr_line; - md_number_to_chars ((char *) buf, insn, 4); - buf += 4; + buf = write_insn (buf, insn); } else { @@ -17913,32 +17940,27 @@ md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED, segT asec, fragS *fragp) exp.X_add_number = 0; } - fixp = fix_new_exp (fragp, buf - (bfd_byte *)fragp->fr_literal, - 4, &exp, FALSE, BFD_RELOC_MIPS_GOT16); + fixp = fix_new_exp (fragp, buf - fragp->fr_literal, 4, &exp, + FALSE, BFD_RELOC_MIPS_GOT16); fixp->fx_file = fragp->fr_file; fixp->fx_line = fragp->fr_line; - md_number_to_chars ((char *) buf, insn, 4); - buf += 4; + buf = write_insn (buf, insn); if (mips_opts.isa == ISA_MIPS1) - { - /* nop */ - md_number_to_chars ((char *) buf, 0, 4); - buf += 4; - } + /* nop */ + buf = write_insn (buf, 0); /* d/addiu $at, $at, R_MIPS_LO16 */ insn = HAVE_64BIT_ADDRESSES ? 0x64000000 : 0x24000000; insn |= at << OP_SH_RS | at << OP_SH_RT; - fixp = fix_new_exp (fragp, buf - (bfd_byte *)fragp->fr_literal, - 4, &exp, FALSE, BFD_RELOC_LO16); + fixp = fix_new_exp (fragp, buf - fragp->fr_literal, 4, &exp, + FALSE, BFD_RELOC_LO16); fixp->fx_file = fragp->fr_file; fixp->fx_line = fragp->fr_line; - md_number_to_chars ((char *) buf, insn, 4); - buf += 4; + buf = write_insn (buf, insn); /* j(al)r $at. */ if (RELAX_BRANCH_LINK (fragp->fr_subtype)) @@ -17947,23 +17969,19 @@ md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED, segT asec, fragS *fragp) insn = 0x00000008; insn |= at << OP_SH_RS; - md_number_to_chars ((char *) buf, insn, 4); - buf += 4; + buf = write_insn (buf, insn); } } - gas_assert (buf == (bfd_byte *)fragp->fr_literal - + fragp->fr_fix + fragp->fr_var); - fragp->fr_fix += fragp->fr_var; - + gas_assert (buf == fragp->fr_literal + fragp->fr_fix); return; } /* Relax microMIPS branches. */ if (RELAX_MICROMIPS_P (fragp->fr_subtype)) { - bfd_byte *buf = (bfd_byte *) (fragp->fr_literal + fragp->fr_fix); + char *buf = fragp->fr_literal + fragp->fr_fix; bfd_boolean compact = RELAX_MICROMIPS_COMPACT (fragp->fr_subtype); bfd_boolean al = RELAX_MICROMIPS_LINK (fragp->fr_subtype); int type = RELAX_MICROMIPS_TYPE (fragp->fr_subtype); @@ -17985,14 +18003,10 @@ md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED, segT asec, fragS *fragp) because if there is linker relaxation, we're going to need the relocations. */ if (type == 'D') - fixp = fix_new_exp (fragp, - buf - (bfd_byte *) fragp->fr_literal, - 2, &exp, TRUE, + fixp = fix_new_exp (fragp, buf - fragp->fr_literal, 2, &exp, TRUE, BFD_RELOC_MICROMIPS_10_PCREL_S1); else if (type == 'E') - fixp = fix_new_exp (fragp, - buf - (bfd_byte *) fragp->fr_literal, - 2, &exp, TRUE, + fixp = fix_new_exp (fragp, buf - fragp->fr_literal, 2, &exp, TRUE, BFD_RELOC_MICROMIPS_7_PCREL_S1); else abort (); @@ -18014,8 +18028,8 @@ md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED, segT asec, fragS *fragp) /* We generate a fixup instead of applying it right now, because if there is linker relaxation, we're going to need the relocations. */ - fixp = fix_new_exp (fragp, buf - (bfd_byte *) fragp->fr_literal, - 4, &exp, TRUE, BFD_RELOC_MICROMIPS_16_PCREL_S1); + fixp = fix_new_exp (fragp, buf - fragp->fr_literal, 4, &exp, TRUE, + BFD_RELOC_MICROMIPS_16_PCREL_S1); fixp->fx_file = fragp->fr_file; fixp->fx_line = fragp->fr_line; @@ -18026,10 +18040,7 @@ md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED, segT asec, fragS *fragp) /* Relax 16-bit branches to 32-bit branches. */ if (type != 0) { - if (target_big_endian) - insn = bfd_getb16 (buf); - else - insn = bfd_getl16 (buf); + insn = read_compressed_insn (buf, 2); if ((insn & 0xfc00) == 0xcc00) /* b16 */ insn = 0x94000000; /* beq */ @@ -18049,32 +18060,13 @@ md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED, segT asec, fragS *fragp) if (!RELAX_MICROMIPS_RELAX32 (fragp->fr_subtype) || !RELAX_MICROMIPS_TOOFAR32 (fragp->fr_subtype)) { - md_number_to_chars ((char *) buf, insn >> 16, 2); - buf += 2; - md_number_to_chars ((char *) buf, insn & 0xffff, 2); - buf += 2; - - gas_assert (buf == ((bfd_byte *) fragp->fr_literal - + fragp->fr_fix)); + buf = write_compressed_insn (buf, insn, 4); + gas_assert (buf == fragp->fr_literal + fragp->fr_fix); return; } } else - { - unsigned long next; - - if (target_big_endian) - { - insn = bfd_getb16 (buf); - next = bfd_getb16 (buf + 2); - } - else - { - insn = bfd_getl16 (buf); - next = bfd_getl16 (buf + 2); - } - insn = (insn << 16) | next; - } + insn = read_compressed_insn (buf, 4); /* Relax 32-bit branches to a sequence of instructions. */ as_warn_where (fragp->fr_file, fragp->fr_line, @@ -18129,24 +18121,16 @@ md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED, segT asec, fragS *fragp) #endif /* Refer to it. */ - fixp = fix_new (fragp, buf - (bfd_byte *) fragp->fr_literal, - 4, l, 0, TRUE, BFD_RELOC_MICROMIPS_16_PCREL_S1); + fixp = fix_new (fragp, buf - fragp->fr_literal, 4, l, 0, TRUE, + BFD_RELOC_MICROMIPS_16_PCREL_S1); fixp->fx_file = fragp->fr_file; fixp->fx_line = fragp->fr_line; /* Branch over the jump. */ - md_number_to_chars ((char *) buf, insn >> 16, 2); - buf += 2; - md_number_to_chars ((char *) buf, insn & 0xffff, 2); - buf += 2; - + buf = write_compressed_insn (buf, insn, 4); if (!compact) - { - /* nop */ - insn = 0x0c00; - md_number_to_chars ((char *) buf, insn, 2); - buf += 2; - } + /* nop */ + buf = write_compressed_insn (buf, 0x0c00, 2); } if (mips_pic == NO_PIC) @@ -18156,23 +18140,15 @@ md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED, segT asec, fragS *fragp) /* j/jal/jals R_MICROMIPS_26_S1 */ insn = al ? jal : 0xd4000000; - fixp = fix_new_exp (fragp, buf - (bfd_byte *) fragp->fr_literal, - 4, &exp, FALSE, BFD_RELOC_MICROMIPS_JMP); + fixp = fix_new_exp (fragp, buf - fragp->fr_literal, 4, &exp, FALSE, + BFD_RELOC_MICROMIPS_JMP); fixp->fx_file = fragp->fr_file; fixp->fx_line = fragp->fr_line; - md_number_to_chars ((char *) buf, insn >> 16, 2); - buf += 2; - md_number_to_chars ((char *) buf, insn & 0xffff, 2); - buf += 2; - + buf = write_compressed_insn (buf, insn, 4); if (compact) - { - /* nop */ - insn = 0x0c00; - md_number_to_chars ((char *) buf, insn, 2); - buf += 2; - } + /* nop */ + buf = write_compressed_insn (buf, 0x0c00, 2); } else { @@ -18190,39 +18166,32 @@ md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED, segT asec, fragS *fragp) exp.X_add_number = 0; } - fixp = fix_new_exp (fragp, buf - (bfd_byte *) fragp->fr_literal, - 4, &exp, FALSE, BFD_RELOC_MICROMIPS_GOT16); + fixp = fix_new_exp (fragp, buf - fragp->fr_literal, 4, &exp, FALSE, + BFD_RELOC_MICROMIPS_GOT16); fixp->fx_file = fragp->fr_file; fixp->fx_line = fragp->fr_line; - md_number_to_chars ((char *) buf, insn >> 16, 2); - buf += 2; - md_number_to_chars ((char *) buf, insn & 0xffff, 2); - buf += 2; + buf = write_compressed_insn (buf, insn, 4); /* d/addiu $at, $at, R_MICROMIPS_LO16 */ insn = HAVE_64BIT_ADDRESSES ? 0x5c000000 : 0x30000000; insn |= at << MICROMIPSOP_SH_RT | at << MICROMIPSOP_SH_RS; - fixp = fix_new_exp (fragp, buf - (bfd_byte *) fragp->fr_literal, - 4, &exp, FALSE, BFD_RELOC_MICROMIPS_LO16); + fixp = fix_new_exp (fragp, buf - fragp->fr_literal, 4, &exp, FALSE, + BFD_RELOC_MICROMIPS_LO16); fixp->fx_file = fragp->fr_file; fixp->fx_line = fragp->fr_line; - md_number_to_chars ((char *) buf, insn >> 16, 2); - buf += 2; - md_number_to_chars ((char *) buf, insn & 0xffff, 2); - buf += 2; + buf = write_compressed_insn (buf, insn, 4); /* jr/jrc/jalr/jalrs $at */ insn = al ? jalr : jr; insn |= at << MICROMIPSOP_SH_MJ; - md_number_to_chars ((char *) buf, insn & 0xffff, 2); - buf += 2; + buf = write_compressed_insn (buf, insn, 2); } - gas_assert (buf == (bfd_byte *) fragp->fr_literal + fragp->fr_fix); + gas_assert (buf == fragp->fr_literal + fragp->fr_fix); return; } @@ -18283,11 +18252,7 @@ md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED, segT asec, fragS *fragp) buf = fragp->fr_literal + fragp->fr_fix; - if (target_big_endian) - insn = bfd_getb16 ((bfd_byte *) buf); - else - insn = bfd_getl16 ((bfd_byte *) buf); - + insn = read_compressed_insn (buf, 2); if (ext) insn |= MIPS16_EXTEND; @@ -18637,8 +18602,7 @@ mips_handle_align (fragS *fragp) case 2: if (nop_opcode == NOP_OPCODE_MICROMIPS) { - md_number_to_chars (p, micromips_nop16_insn.insn_opcode, 2); - p += 2; + p = write_compressed_insn (p, micromips_nop16_insn.insn_opcode, 2); break; } *p++ = '\0'; -- 2.7.4