X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=gas%2Fcgen.c;h=76e6826b1eaee5d4aebf4ae653f2cb3c0aa5f2b7;hb=983aea3412d8271befd6b83ba2464f5ae2baa674;hp=3d2330e05fb17fcd445a33bd2054a78d31bf7c18;hpb=5b64ad42d36e6d487e1f7287d37fbc243a178e72;p=deliverable%2Fbinutils-gdb.git diff --git a/gas/cgen.c b/gas/cgen.c index 3d2330e05f..76e6826b1e 100644 --- a/gas/cgen.c +++ b/gas/cgen.c @@ -1,21 +1,22 @@ /* GAS interface for targets using CGEN: Cpu tools GENerator. - Copyright (C) 1996, 1997, 1998, 1999 Free Software Foundation, Inc. + Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003 + Free Software Foundation, Inc. -This file is part of GAS, the GNU Assembler. + This file is part of GAS, the GNU Assembler. -GAS is free software; you can redistribute it and/or modify -it under the terms of the GNU General Public License as published by -the Free Software Foundation; either version 2, or (at your option) -any later version. + GAS is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. -GAS is distributed in the hope that it will be useful, -but WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -GNU General Public License for more details. + GAS is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. -You should have received a copy of the GNU General Public License -along with GAS; see the file COPYING. If not, write to the Free Software -Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + You should have received a copy of the GNU General Public License + along with GAS; see the file COPYING. If not, write to the Free Software + Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include #include "ansidecl.h" @@ -26,6 +27,9 @@ Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "as.h" #include "subsegs.h" #include "cgen.h" +#include "dwarf2dbg.h" + +static void queue_fixup PARAMS ((int, int, expressionS *)); /* Opcode table descriptor, must be set by md_begin. */ @@ -37,13 +41,13 @@ CGEN_CPU_DESC gas_cgen_cpu_desc; void cgen_asm_record_register (name, number) - char * name; + char *name; int number; { /* Use symbol_create here instead of symbol_new so we don't try to output registers into the object file's symbol table. */ symbol_table_insert (symbol_create (name, reg_section, - number, & zero_address_frag)); + number, &zero_address_frag)); } /* We need to keep a list of fixups. We can't simply generate them as @@ -64,7 +68,7 @@ struct fixup expressionS exp; }; -static struct fixup fixups [GAS_CGEN_MAX_FIXUPS]; +static struct fixup fixups[GAS_CGEN_MAX_FIXUPS]; static int num_fixups; /* Prepare to parse an instruction. @@ -81,72 +85,131 @@ gas_cgen_init_parse () static void queue_fixup (opindex, opinfo, expP) int opindex; + int opinfo; expressionS * expP; { /* We need to generate a fixup for this expression. */ if (num_fixups >= GAS_CGEN_MAX_FIXUPS) as_fatal (_("too many fixups")); - fixups[num_fixups].exp = * expP; + fixups[num_fixups].exp = *expP; fixups[num_fixups].opindex = opindex; fixups[num_fixups].opinfo = opinfo; ++ num_fixups; } -/* The following three functions allow a backup of the fixup chain to be made, - and to have this backup be swapped with the current chain. This allows - certain ports, eg the m32r, to swap two instructions and swap their fixups - at the same time. */ -/* ??? I think with cgen_asm_finish_insn (or something else) there is no - more need for this. */ +/* The following functions allow fixup chains to be stored, retrieved, + and swapped. They are a generalization of a pre-existing scheme + for storing, restoring and swapping fixup chains that was used by + the m32r port. The functionality is essentially the same, only + instead of only being able to store a single fixup chain, an entire + array of fixup chains can be stored. It is the user's responsibility + to keep track of how many fixup chains have been stored and which + elements of the array they are in. + + The algorithms used are the same as in the old scheme. Other than the + "array-ness" of the whole thing, the functionality is identical to the + old scheme. + + gas_cgen_initialize_saved_fixups_array(): + Sets num_fixups_in_chain to 0 for each element. Call this from + md_begin() if you plan to use these functions and you want the + fixup count in each element to be set to 0 initially. This is + not necessary, but it's included just in case. It performs + the same function for each element in the array of fixup chains + that gas_init_parse() performs for the current fixups. + + gas_cgen_save_fixups (element): + element - element number of the array you wish to store the fixups + to. No mechanism is built in for tracking what element + was last stored to. + + gas_cgen_restore_fixups (element): + element - element number of the array you wish to restore the fixups + from. + + gas_cgen_swap_fixups(int element): + element - swap the current fixups with those in this element number. +*/ + +struct saved_fixups +{ + struct fixup fixup_chain[GAS_CGEN_MAX_FIXUPS]; + int num_fixups_in_chain; +}; -static struct fixup saved_fixups [GAS_CGEN_MAX_FIXUPS]; -static int saved_num_fixups; +static struct saved_fixups stored_fixups[MAX_SAVED_FIXUP_CHAINS]; void -gas_cgen_save_fixups () +gas_cgen_initialize_saved_fixups_array () { - saved_num_fixups = num_fixups; - - memcpy (saved_fixups, fixups, sizeof (fixups[0]) * num_fixups); + int i = 0; - num_fixups = 0; + while (i < MAX_SAVED_FIXUP_CHAINS) + stored_fixups[i++].num_fixups_in_chain = 0; } void -gas_cgen_restore_fixups () +gas_cgen_save_fixups (i) + int i; { - num_fixups = saved_num_fixups; - - memcpy (fixups, saved_fixups, sizeof (fixups[0]) * num_fixups); + if (i < 0 || i >= MAX_SAVED_FIXUP_CHAINS) + { + as_fatal ("index into stored_fixups[] out of bounds"); + return; + } - saved_num_fixups = 0; + stored_fixups[i].num_fixups_in_chain = num_fixups; + memcpy (stored_fixups[i].fixup_chain, fixups, + sizeof (fixups[0]) * num_fixups); + num_fixups = 0; } void -gas_cgen_swap_fixups () +gas_cgen_restore_fixups (i) + int i; { - int tmp; - struct fixup tmp_fixup; - - if (num_fixups == 0) + if (i < 0 || i >= MAX_SAVED_FIXUP_CHAINS) { - gas_cgen_restore_fixups (); + as_fatal ("index into stored_fixups[] out of bounds"); + return; } - else if (saved_num_fixups == 0) + + num_fixups = stored_fixups[i].num_fixups_in_chain; + memcpy (fixups, stored_fixups[i].fixup_chain, + (sizeof (stored_fixups[i].fixup_chain[0])) * num_fixups); + stored_fixups[i].num_fixups_in_chain = 0; +} + +void +gas_cgen_swap_fixups (i) + int i; +{ + if (i < 0 || i >= MAX_SAVED_FIXUP_CHAINS) { - gas_cgen_save_fixups (); + as_fatal ("index into stored_fixups[] out of bounds"); + return; } + + if (num_fixups == 0) + gas_cgen_restore_fixups (i); + + else if (stored_fixups[i].num_fixups_in_chain == 0) + gas_cgen_save_fixups (i); + else { - tmp = saved_num_fixups; - saved_num_fixups = num_fixups; + int tmp; + struct fixup tmp_fixup; + + tmp = stored_fixups[i].num_fixups_in_chain; + stored_fixups[i].num_fixups_in_chain = num_fixups; num_fixups = tmp; - + for (tmp = GAS_CGEN_MAX_FIXUPS; tmp--;) { - tmp_fixup = saved_fixups [tmp]; - saved_fixups [tmp] = fixups [tmp]; - fixups [tmp] = tmp_fixup; + tmp_fixup = stored_fixups[i].fixup_chain [tmp]; + stored_fixups[i].fixup_chain[tmp] = fixups [tmp]; + fixups [tmp] = tmp_fixup; } } } @@ -162,7 +225,7 @@ gas_cgen_swap_fixups () At this point we do not use a bfd_reloc_code_real_type for operands residing in the insn, but instead just use the operand index. This lets us easily handle fixups for any - operand type. We pick a BFD reloc type in md_apply_fix. */ + operand type. We pick a BFD reloc type in md_apply_fix3. */ fixS * gas_cgen_record_fixup (frag, where, insn, length, operand, opinfo, symbol, offset) @@ -175,11 +238,10 @@ gas_cgen_record_fixup (frag, where, insn, length, operand, opinfo, symbol, offse symbolS * symbol; offsetT offset; { - fixS * fixP; + fixS *fixP; /* It may seem strange to use operand->attrs and not insn->attrs here, but it is the operand that has a pc relative relocation. */ - fixP = fix_new (frag, where, length / 8, symbol, offset, CGEN_OPERAND_ATTR_VALUE (operand, CGEN_OPERAND_PCREL_ADDR), (bfd_reloc_code_real_type) @@ -202,7 +264,7 @@ gas_cgen_record_fixup (frag, where, insn, length, operand, opinfo, symbol, offse At this point we do not use a bfd_reloc_code_real_type for operands residing in the insn, but instead just use the operand index. This lets us easily handle fixups for any - operand type. We pick a BFD reloc type in md_apply_fix. */ + operand type. We pick a BFD reloc type in md_apply_fix3. */ fixS * gas_cgen_record_fixup_exp (frag, where, insn, length, operand, opinfo, exp) @@ -214,11 +276,10 @@ gas_cgen_record_fixup_exp (frag, where, insn, length, operand, opinfo, exp) int opinfo; expressionS * exp; { - fixS * fixP; + fixS *fixP; /* It may seem strange to use operand->attrs and not insn->attrs here, but it is the operand that has a pc relative relocation. */ - fixP = fix_new_exp (frag, where, length / 8, exp, CGEN_OPERAND_ATTR_VALUE (operand, CGEN_OPERAND_PCREL_ADDR), (bfd_reloc_code_real_type) @@ -232,6 +293,7 @@ gas_cgen_record_fixup_exp (frag, where, insn, length, operand, opinfo, exp) /* Used for communication between the next two procedures. */ static jmp_buf expr_jmp_buf; +static int expr_jmp_buf_p; /* Callback for cgen interface. Parse the expression at *STRP. The result is an error message or NULL for success (in which case @@ -246,23 +308,23 @@ static jmp_buf expr_jmp_buf; const char * gas_cgen_parse_operand (cd, want, strP, opindex, opinfo, resultP, valueP) - CGEN_CPU_DESC cd; + CGEN_CPU_DESC cd ATTRIBUTE_UNUSED; enum cgen_parse_operand_type want; - const char ** strP; + const char **strP; int opindex; int opinfo; - enum cgen_parse_operand_result * resultP; - bfd_vma * valueP; + enum cgen_parse_operand_result *resultP; + bfd_vma *valueP; { #ifdef __STDC__ /* These are volatile to survive the setjmp. */ char * volatile hold; enum cgen_parse_operand_result * volatile resultP_1; #else - static char * hold; - static enum cgen_parse_operand_result * resultP_1; + static char *hold; + static enum cgen_parse_operand_result *resultP_1; #endif - const char * errmsg = NULL; + const char *errmsg; expressionS exp; if (want == CGEN_PARSE_OPERAND_INIT) @@ -273,46 +335,50 @@ gas_cgen_parse_operand (cd, want, strP, opindex, opinfo, resultP, valueP) resultP_1 = resultP; hold = input_line_pointer; - input_line_pointer = (char *) * strP; + input_line_pointer = (char *) *strP; /* We rely on md_operand to longjmp back to us. This is done via gas_cgen_md_operand. */ if (setjmp (expr_jmp_buf) != 0) { + expr_jmp_buf_p = 0; input_line_pointer = (char *) hold; - * resultP_1 = CGEN_PARSE_OPERAND_RESULT_ERROR; - return "illegal operand"; + *resultP_1 = CGEN_PARSE_OPERAND_RESULT_ERROR; + return _("illegal operand"); } - expression (& exp); + expr_jmp_buf_p = 1; + expression (&exp); + expr_jmp_buf_p = 0; + errmsg = NULL; - * strP = input_line_pointer; + *strP = input_line_pointer; input_line_pointer = hold; /* FIXME: Need to check `want'. */ switch (exp.X_op) { - case O_illegal : + case O_illegal: errmsg = _("illegal operand"); - * resultP = CGEN_PARSE_OPERAND_RESULT_ERROR; + *resultP = CGEN_PARSE_OPERAND_RESULT_ERROR; break; - case O_absent : + case O_absent: errmsg = _("missing operand"); - * resultP = CGEN_PARSE_OPERAND_RESULT_ERROR; + *resultP = CGEN_PARSE_OPERAND_RESULT_ERROR; break; - case O_constant : - * valueP = exp.X_add_number; - * resultP = CGEN_PARSE_OPERAND_RESULT_NUMBER; + case O_constant: + *valueP = exp.X_add_number; + *resultP = CGEN_PARSE_OPERAND_RESULT_NUMBER; break; - case O_register : - * valueP = exp.X_add_number; - * resultP = CGEN_PARSE_OPERAND_RESULT_REGISTER; + case O_register: + *valueP = exp.X_add_number; + *resultP = CGEN_PARSE_OPERAND_RESULT_REGISTER; break; - default : - queue_fixup (opindex, opinfo, & exp); - * valueP = 0; - * resultP = CGEN_PARSE_OPERAND_RESULT_QUEUED; + default: + queue_fixup (opindex, opinfo, &exp); + *valueP = 0; + *resultP = CGEN_PARSE_OPERAND_RESULT_QUEUED; break; } @@ -326,9 +392,11 @@ gas_cgen_parse_operand (cd, want, strP, opindex, opinfo, resultP, valueP) void gas_cgen_md_operand (expressionP) - expressionS * expressionP; + expressionS *expressionP ATTRIBUTE_UNUSED; { - longjmp (expr_jmp_buf, 1); + /* Don't longjmp if we're not called from within cgen_parse_operand(). */ + if (expr_jmp_buf_p) + longjmp (expr_jmp_buf, 1); } /* Finish assembling instruction INSN. @@ -340,15 +408,15 @@ gas_cgen_md_operand (expressionP) void gas_cgen_finish_insn (insn, buf, length, relax_p, result) - const CGEN_INSN * insn; + const CGEN_INSN *insn; CGEN_INSN_BYTES_PTR buf; unsigned int length; int relax_p; - finished_insnS * result; + finished_insnS *result; { int i; int relax_operand; - char * f; + char *f; unsigned int byte_len = length / 8; /* ??? Target foo issues various warnings here, so one might want to provide @@ -364,7 +432,8 @@ gas_cgen_finish_insn (insn, buf, length, relax_p, result) space for the largest insn. */ if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAX)) - abort (); /* These currently shouldn't get here. */ + /* These currently shouldn't get here. */ + abort (); /* Is there a relaxable insn with the relaxable operand needing a fixup? */ @@ -374,7 +443,7 @@ gas_cgen_finish_insn (insn, buf, length, relax_p, result) /* Scan the fixups for the operand affected by relaxing (i.e. the branch address). */ - for (i = 0; i < num_fixups; ++ i) + for (i = 0; i < num_fixups; ++i) { if (CGEN_OPERAND_ATTR_VALUE (cgen_operand_lookup_by_num (gas_cgen_cpu_desc, fixups[i].opindex), CGEN_OPERAND_RELAX)) @@ -388,7 +457,10 @@ gas_cgen_finish_insn (insn, buf, length, relax_p, result) if (relax_operand != -1) { int max_len; - fragS * old_frag; + fragS *old_frag; + expressionS *exp; + symbolS *sym; + offsetT off; #ifdef TC_CGEN_MAX_RELAX max_len = TC_CGEN_MAX_RELAX (insn, byte_len); @@ -405,14 +477,24 @@ gas_cgen_finish_insn (insn, buf, length, relax_p, result) /* Create a relaxable fragment for this instruction. */ old_frag = frag_now; + exp = &fixups[relax_operand].exp; + sym = exp->X_add_symbol; + off = exp->X_add_number; + if (exp->X_op != O_constant && exp->X_op != O_symbol) + { + /* Handle complex expressions. */ + sym = make_expr_symbol (exp); + off = 0; + } + frag_var (rs_machine_dependent, max_len - byte_len /* max chars */, 0 /* variable part already allocated */, /* FIXME: When we machine generate the relax table, machine generate a macro to compute subtype. */ 1 /* subtype */, - fixups[relax_operand].exp.X_add_symbol, - fixups[relax_operand].exp.X_add_number, + sym, + off, f); /* Record the operand number with the fragment so md_convert_frag @@ -438,6 +520,9 @@ gas_cgen_finish_insn (insn, buf, length, relax_p, result) memcpy (f, buf, byte_len); #endif + /* Emit DWARF2 debugging information. */ + dwarf2_emit_insn (byte_len); + /* Create any fixups. */ for (i = 0; i < num_fixups; ++i) { @@ -457,12 +542,12 @@ gas_cgen_finish_insn (insn, buf, length, relax_p, result) #define md_cgen_record_fixup_exp gas_cgen_record_fixup_exp #endif - fixP = md_cgen_record_fixup_exp (frag_now, f - frag_now->fr_literal, - insn, length, operand, - fixups[i].opinfo, - & fixups[i].exp); - if (result) - result->fixups[i] = fixP; + fixP = md_cgen_record_fixup_exp (frag_now, f - frag_now->fr_literal, + insn, length, operand, + fixups[i].opinfo, + &fixups[i].exp); + if (result) + result->fixups[i] = fixP; } if (result) @@ -484,50 +569,23 @@ gas_cgen_finish_insn (insn, buf, length, relax_p, result) handles the rest. bfd_install_relocation (or some other bfd function) should handle them all. */ -int -gas_cgen_md_apply_fix3 (fixP, valueP, seg) +void +gas_cgen_md_apply_fix3 (fixP, valP, seg) fixS * fixP; - valueT * valueP; - segT seg; + valueT * valP; + segT seg ATTRIBUTE_UNUSED; { - char * where = fixP->fx_frag->fr_literal + fixP->fx_where; - valueT value; - /* canonical name, since used a lot */ + char *where = fixP->fx_frag->fr_literal + fixP->fx_where; + valueT value = * valP; + /* Canonical name, since used a lot. */ CGEN_CPU_DESC cd = gas_cgen_cpu_desc; - - /* FIXME FIXME FIXME: The value we are passed in *valuep includes - the symbol values. Since we are using BFD_ASSEMBLER, if we are - doing this relocation the code in write.c is going to call - bfd_install_relocation, which is also going to use the symbol - value. That means that if the reloc is fully resolved we want to - use *valuep since bfd_install_relocation is not being used. - However, if the reloc is not fully resolved we do not want to use - *valuep, and must use fx_offset instead. However, if the reloc - is PC relative, we do want to use *valuep since it includes the - result of md_pcrel_from. This is confusing. */ if (fixP->fx_addsy == (symbolS *) NULL) - { - value = * valueP; - fixP->fx_done = 1; - } - else if (fixP->fx_pcrel) - value = * valueP; - else - { - value = fixP->fx_offset; - if (fixP->fx_subsy != (symbolS *) NULL) - { - if (S_GET_SEGMENT (fixP->fx_subsy) == absolute_section) - value -= S_GET_VALUE (fixP->fx_subsy); - else - { - /* We don't actually support subtracting a symbol. */ - as_bad_where (fixP->fx_file, fixP->fx_line, - _("expression too complex")); - } - } - } + fixP->fx_done = 1; + + /* We don't actually support subtracting a symbol. */ + if (fixP->fx_subsy != (symbolS *) NULL) + as_bad_where (fixP->fx_file, fixP->fx_line, _("expression too complex")); if ((int) fixP->fx_r_type >= (int) BFD_RELOC_UNUSED) { @@ -553,23 +611,23 @@ gas_cgen_md_apply_fix3 (fixP, valueP, seg) CGEN_INSN_INT insn_value = cgen_get_insn_value (cd, where, CGEN_INSN_BITSIZE (insn)); - /* ??? 0 is passed for `pc' */ + /* ??? 0 is passed for `pc'. */ errmsg = CGEN_CPU_INSERT_OPERAND (cd) (cd, opindex, fields, &insn_value, (bfd_vma) 0); cgen_put_insn_value (cd, where, CGEN_INSN_BITSIZE (insn), insn_value); } #else - /* ??? 0 is passed for `pc' */ - errmsg = CGEN_CPU_INSERT_OPERAND (cd) (cd, opindex, fields, where, - (bfd_vma) 0); + /* ??? 0 is passed for `pc'. */ + errmsg = CGEN_CPU_INSERT_OPERAND (cd) (cd, opindex, fields, where, + (bfd_vma) 0); #endif if (errmsg) as_bad_where (fixP->fx_file, fixP->fx_line, "%s", errmsg); } if (fixP->fx_done) - return 1; + return; /* The operand isn't fully resolved. Determine a BFD reloc value based on the operand information and leave it to @@ -577,16 +635,15 @@ gas_cgen_md_apply_fix3 (fixP, valueP, seg) partial_inplace == false. */ reloc_type = md_cgen_lookup_reloc (insn, operand, fixP); + if (reloc_type != BFD_RELOC_NONE) - { - fixP->fx_r_type = reloc_type; - } + fixP->fx_r_type = reloc_type; else { as_bad_where (fixP->fx_file, fixP->fx_line, _("unresolved expression that must be resolved")); fixP->fx_done = 1; - return 1; + return; } } else if (fixP->fx_done) @@ -604,7 +661,9 @@ gas_cgen_md_apply_fix3 (fixP, valueP, seg) case BFD_RELOC_32: md_number_to_chars (where, value, 4); break; - /* FIXME: later add support for 64 bits. */ + case BFD_RELOC_64: + md_number_to_chars (where, value, 8); + break; default: as_bad_where (fixP->fx_file, fixP->fx_line, _("internal error: can't install fix for reloc type %d (`%s')"), @@ -612,17 +671,13 @@ gas_cgen_md_apply_fix3 (fixP, valueP, seg) break; } } - else - { - /* bfd_install_relocation will be called to finish things up. */ - } + /* else + bfd_install_relocation will be called to finish things up. */ /* Tuck `value' away for use by tc_gen_reloc. See the comment describing fx_addnumber in write.h. This field is misnamed (or misused :-). */ fixP->fx_addnumber = value; - - return 1; } /* Translate internal representation of relocation info to BFD target format. @@ -631,10 +686,10 @@ gas_cgen_md_apply_fix3 (fixP, valueP, seg) arelent * gas_cgen_tc_gen_reloc (section, fixP) - asection * section; + asection * section ATTRIBUTE_UNUSED; fixS * fixP; { - arelent * reloc; + arelent *reloc; reloc = (arelent *) xmalloc (sizeof (arelent)); @@ -642,21 +697,21 @@ gas_cgen_tc_gen_reloc (section, fixP) if (reloc->howto == (reloc_howto_type *) NULL) { as_bad_where (fixP->fx_file, fixP->fx_line, - _("internal error: can't export reloc type %d (`%s')"), - fixP->fx_r_type, bfd_get_reloc_code_name (fixP->fx_r_type)); + _("relocation is not supported")); return NULL; } assert (!fixP->fx_pcrel == !reloc->howto->pc_relative); - reloc->sym_ptr_ptr = & fixP->fx_addsy->bsym; + reloc->sym_ptr_ptr = (asymbol **) xmalloc (sizeof (asymbol *)); + *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixP->fx_addsy); - /* Use fx_offset for these cases */ - if ( fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY + /* Use fx_offset for these cases. */ + if (fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY || fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT) - reloc->addend = fixP->fx_offset; + reloc->addend = fixP->fx_offset; else - reloc->addend = fixP->fx_addnumber; + reloc->addend = fixP->fx_addnumber; reloc->address = fixP->fx_frag->fr_address + fixP->fx_where; return reloc;