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Diffstat (limited to 'gas/cgen.c')
| -rw-r--r-- | gas/cgen.c | 664 |
1 files changed, 0 insertions, 664 deletions
diff --git a/gas/cgen.c b/gas/cgen.c deleted file mode 100644 index e15e1b65346..00000000000 --- a/gas/cgen.c +++ /dev/null @@ -1,664 +0,0 @@ -/* GAS interface for targets using CGEN: Cpu tools GENerator. - Copyright (C) 1996, 1997, 1998, 1999 Free Software Foundation, Inc. - -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 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. */ - -#include <setjmp.h> -#include "ansidecl.h" -#include "libiberty.h" -#include "bfd.h" -#include "symcat.h" -#include "cgen-desc.h" -#include "as.h" -#include "subsegs.h" -#include "cgen.h" - -/* Opcode table descriptor, must be set by md_begin. */ - -CGEN_CPU_DESC gas_cgen_cpu_desc; - -/* Callback to insert a register into the symbol table. - A target may choose to let GAS parse the registers. - ??? Not currently used. */ - -void -cgen_asm_record_register (name, number) - 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)); -} - -/* We need to keep a list of fixups. We can't simply generate them as - we go, because that would require us to first create the frag, and - that would screw up references to ``.''. - - This is used by cpu's with simple operands. It keeps knowledge of what - an `expressionS' is and what a `fixup' is out of CGEN which for the time - being is preferable. - - OPINDEX is the index in the operand table. - OPINFO is something the caller chooses to help in reloc determination. */ - -struct fixup -{ - int opindex; - int opinfo; - expressionS exp; -}; - -static struct fixup fixups [GAS_CGEN_MAX_FIXUPS]; -static int num_fixups; - -/* Prepare to parse an instruction. - ??? May wish to make this static and delete calls in md_assemble. */ - -void -gas_cgen_init_parse () -{ - num_fixups = 0; -} - -/* Queue a fixup. */ - -static void -queue_fixup (opindex, opinfo, expP) - int opindex; - 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].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. */ - -static struct fixup saved_fixups [GAS_CGEN_MAX_FIXUPS]; -static int saved_num_fixups; - -void -gas_cgen_save_fixups () -{ - saved_num_fixups = num_fixups; - - memcpy (saved_fixups, fixups, sizeof (fixups[0]) * num_fixups); - - num_fixups = 0; -} - -void -gas_cgen_restore_fixups () -{ - num_fixups = saved_num_fixups; - - memcpy (fixups, saved_fixups, sizeof (fixups[0]) * num_fixups); - - saved_num_fixups = 0; -} - -void -gas_cgen_swap_fixups () -{ - int tmp; - struct fixup tmp_fixup; - - if (num_fixups == 0) - { - gas_cgen_restore_fixups (); - } - else if (saved_num_fixups == 0) - { - gas_cgen_save_fixups (); - } - else - { - tmp = saved_num_fixups; - saved_num_fixups = 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; - } - } -} - -/* Default routine to record a fixup. - This is a cover function to fix_new. - It exists because we record INSN with the fixup. - - FRAG and WHERE are their respective arguments to fix_new_exp. - LENGTH is in bits. - OPINFO is something the caller chooses to help in reloc determination. - - 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. */ - -fixS * -gas_cgen_record_fixup (frag, where, insn, length, operand, opinfo, symbol, offset) - fragS * frag; - int where; - const CGEN_INSN * insn; - int length; - const CGEN_OPERAND * operand; - int opinfo; - symbolS * symbol; - offsetT offset; -{ - 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) - ((int) BFD_RELOC_UNUSED - + (int) operand->type)); - fixP->fx_cgen.insn = insn; - fixP->fx_cgen.opinfo = opinfo; - - return fixP; -} - -/* Default routine to record a fixup given an expression. - This is a cover function to fix_new_exp. - It exists because we record INSN with the fixup. - - FRAG and WHERE are their respective arguments to fix_new_exp. - LENGTH is in bits. - OPINFO is something the caller chooses to help in reloc determination. - - 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. */ - -fixS * -gas_cgen_record_fixup_exp (frag, where, insn, length, operand, opinfo, exp) - fragS * frag; - int where; - const CGEN_INSN * insn; - int length; - const CGEN_OPERAND * operand; - int opinfo; - expressionS * exp; -{ - 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) - ((int) BFD_RELOC_UNUSED - + (int) operand->type)); - fixP->fx_cgen.insn = insn; - fixP->fx_cgen.opinfo = opinfo; - - return fixP; -} - -/* Used for communication between the next two procedures. */ -static jmp_buf expr_jmp_buf; - -/* Callback for cgen interface. Parse the expression at *STRP. - The result is an error message or NULL for success (in which case - *STRP is advanced past the parsed text). - WANT is an indication of what the caller is looking for. - If WANT == CGEN_ASM_PARSE_INIT the caller is beginning to try to match - a table entry with the insn, reset the queued fixups counter. - An enum cgen_parse_operand_result is stored in RESULTP. - OPINDEX is the operand's table entry index. - OPINFO is something the caller chooses to help in reloc determination. - The resulting value is stored in VALUEP. */ - -const char * -gas_cgen_parse_operand (cd, want, strP, opindex, opinfo, resultP, valueP) - CGEN_CPU_DESC cd; - enum cgen_parse_operand_type want; - const char ** strP; - int opindex; - int opinfo; - 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; -#endif - const char * errmsg = NULL; - expressionS exp; - - if (want == CGEN_PARSE_OPERAND_INIT) - { - gas_cgen_init_parse (); - return NULL; - } - - resultP_1 = resultP; - hold = input_line_pointer; - 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) - { - input_line_pointer = (char *) hold; - * resultP_1 = CGEN_PARSE_OPERAND_RESULT_ERROR; - return "illegal operand"; - } - - expression (& exp); - - * strP = input_line_pointer; - input_line_pointer = hold; - - /* FIXME: Need to check `want'. */ - - switch (exp.X_op) - { - case O_illegal : - errmsg = _("illegal operand"); - * resultP = CGEN_PARSE_OPERAND_RESULT_ERROR; - break; - case O_absent : - errmsg = _("missing operand"); - * resultP = CGEN_PARSE_OPERAND_RESULT_ERROR; - break; - 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; - break; - default : - queue_fixup (opindex, opinfo, & exp); - * valueP = 0; - * resultP = CGEN_PARSE_OPERAND_RESULT_QUEUED; - break; - } - - return errmsg; -} - -/* md_operand handler to catch unrecognized expressions and halt the - parsing process so the next entry can be tried. - - ??? This could be done differently by adding code to `expression'. */ - -void -gas_cgen_md_operand (expressionP) - expressionS * expressionP; -{ - longjmp (expr_jmp_buf, 1); -} - -/* Finish assembling instruction INSN. - BUF contains what we've built up so far. - LENGTH is the size of the insn in bits. - RELAX_P is non-zero if relaxable insns should be emitted as such. - Otherwise they're emitted in non-relaxable forms. - The "result" is stored in RESULT if non-NULL. */ - -void -gas_cgen_finish_insn (insn, buf, length, relax_p, result) - const CGEN_INSN * insn; - CGEN_INSN_BYTES_PTR buf; - unsigned int length; - int relax_p; - finished_insnS * result; -{ - int i; - int relax_operand; - char * f; - unsigned int byte_len = length / 8; - - /* ??? Target foo issues various warnings here, so one might want to provide - a hook here. However, our caller is defined in tc-foo.c so there - shouldn't be a need for a hook. */ - - /* Write out the instruction. - It is important to fetch enough space in one call to `frag_more'. - We use (f - frag_now->fr_literal) to compute where we are and we - don't want frag_now to change between calls. - - Relaxable instructions: We need to ensure we allocate enough - space for the largest insn. */ - - if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAX)) - abort (); /* These currently shouldn't get here. */ - - /* Is there a relaxable insn with the relaxable operand needing a fixup? */ - - relax_operand = -1; - if (relax_p && CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXABLE)) - { - /* Scan the fixups for the operand affected by relaxing - (i.e. the branch address). */ - - 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)) - { - relax_operand = i; - break; - } - } - } - - if (relax_operand != -1) - { - int max_len; - fragS * old_frag; - -#ifdef TC_CGEN_MAX_RELAX - max_len = TC_CGEN_MAX_RELAX (insn, byte_len); -#else - max_len = CGEN_MAX_INSN_SIZE; -#endif - /* Ensure variable part and fixed part are in same fragment. */ - /* FIXME: Having to do this seems like a hack. */ - frag_grow (max_len); - - /* Allocate space for the fixed part. */ - f = frag_more (byte_len); - - /* Create a relaxable fragment for this instruction. */ - old_frag = frag_now; - - 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, - f); - - /* Record the operand number with the fragment so md_convert_frag - can use gas_cgen_md_record_fixup to record the appropriate reloc. */ - old_frag->fr_cgen.insn = insn; - old_frag->fr_cgen.opindex = fixups[relax_operand].opindex; - old_frag->fr_cgen.opinfo = fixups[relax_operand].opinfo; - if (result) - result->frag = old_frag; - } - else - { - f = frag_more (byte_len); - if (result) - result->frag = frag_now; - } - - /* If we're recording insns as numbers (rather than a string of bytes), - target byte order handling is deferred until now. */ -#if CGEN_INT_INSN_P - cgen_put_insn_value (gas_cgen_cpu_desc, f, length, *buf); -#else - memcpy (f, buf, byte_len); -#endif - - /* Create any fixups. */ - for (i = 0; i < num_fixups; ++i) - { - fixS *fixP; - const CGEN_OPERAND *operand = - cgen_operand_lookup_by_num (gas_cgen_cpu_desc, fixups[i].opindex); - - /* Don't create fixups for these. That's done during relaxation. - We don't need to test for CGEN_INSN_RELAX as they can't get here - (see above). */ - if (relax_p - && CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXABLE) - && CGEN_OPERAND_ATTR_VALUE (operand, CGEN_OPERAND_RELAX)) - continue; - -#ifndef md_cgen_record_fixup_exp -#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; - } - - if (result) - { - result->num_fixups = num_fixups; - result->addr = f; - } -} - -/* Apply a fixup to the object code. This is called for all the - fixups we generated by the call to fix_new_exp, above. In the call - above we used a reloc code which was the largest legal reloc code - plus the operand index. Here we undo that to recover the operand - index. At this point all symbol values should be fully resolved, - and we attempt to completely resolve the reloc. If we can not do - that, we determine the correct reloc code and put it back in the fixup. */ - -/* FIXME: This function handles some of the fixups and bfd_install_relocation - handles the rest. bfd_install_relocation (or some other bfd function) - should handle them all. */ - -int -gas_cgen_md_apply_fix3 (fixP, valueP, seg) - fixS * fixP; - valueT * valueP; - segT seg; -{ - char * where = fixP->fx_frag->fr_literal + fixP->fx_where; - valueT value; - /* 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")); - } - } - } - - if ((int) fixP->fx_r_type >= (int) BFD_RELOC_UNUSED) - { - int opindex = (int) fixP->fx_r_type - (int) BFD_RELOC_UNUSED; - const CGEN_OPERAND *operand = cgen_operand_lookup_by_num (cd, opindex); - const char *errmsg; - bfd_reloc_code_real_type reloc_type; - CGEN_FIELDS *fields = alloca (CGEN_CPU_SIZEOF_FIELDS (cd)); - const CGEN_INSN *insn = fixP->fx_cgen.insn; - - /* If the reloc has been fully resolved finish the operand here. */ - /* FIXME: This duplicates the capabilities of code in BFD. */ - if (fixP->fx_done - /* FIXME: If partial_inplace isn't set bfd_install_relocation won't - finish the job. Testing for pcrel is a temporary hack. */ - || fixP->fx_pcrel) - { - CGEN_CPU_SET_FIELDS_BITSIZE (cd) (fields, CGEN_INSN_BITSIZE (insn)); - CGEN_CPU_SET_VMA_OPERAND (cd) (cd, opindex, fields, (bfd_vma) value); - -#if CGEN_INT_INSN_P - { - CGEN_INSN_INT insn_value = - cgen_get_insn_value (cd, where, CGEN_INSN_BITSIZE (insn)); - - /* ??? 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); -#endif - if (errmsg) - as_bad_where (fixP->fx_file, fixP->fx_line, "%s", errmsg); - } - - if (fixP->fx_done) - return 1; - - /* The operand isn't fully resolved. Determine a BFD reloc value - based on the operand information and leave it to - bfd_install_relocation. Note that this doesn't work when - partial_inplace == false. */ - - reloc_type = md_cgen_lookup_reloc (insn, operand, fixP); - if (reloc_type != BFD_RELOC_NONE) - { - 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; - } - } - else if (fixP->fx_done) - { - /* We're finished with this fixup. Install it because - bfd_install_relocation won't be called to do it. */ - switch (fixP->fx_r_type) - { - case BFD_RELOC_8: - md_number_to_chars (where, value, 1); - break; - case BFD_RELOC_16: - md_number_to_chars (where, value, 2); - break; - case BFD_RELOC_32: - md_number_to_chars (where, value, 4); - break; - /* FIXME: later add support for 64 bits. */ - default: - as_bad_where (fixP->fx_file, fixP->fx_line, - _("internal error: can't install fix for reloc type %d (`%s')"), - fixP->fx_r_type, bfd_get_reloc_code_name (fixP->fx_r_type)); - break; - } - } - 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. - - FIXME: To what extent can we get all relevant targets to use this? */ - -arelent * -gas_cgen_tc_gen_reloc (section, fixP) - asection * section; - fixS * fixP; -{ - arelent * reloc; - - reloc = (arelent *) xmalloc (sizeof (arelent)); - - reloc->howto = bfd_reloc_type_lookup (stdoutput, fixP->fx_r_type); - 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)); - return NULL; - } - - assert (!fixP->fx_pcrel == !reloc->howto->pc_relative); - - 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 - || fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT) - reloc->addend = fixP->fx_offset; - else - reloc->addend = fixP->fx_addnumber; - - reloc->address = fixP->fx_frag->fr_address + fixP->fx_where; - return reloc; -} |