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Diffstat (limited to 'ld/ldexp.c')
| -rw-r--r-- | ld/ldexp.c | 770 |
1 files changed, 770 insertions, 0 deletions
diff --git a/ld/ldexp.c b/ld/ldexp.c new file mode 100644 index 0000000..5b8581f --- /dev/null +++ b/ld/ldexp.c @@ -0,0 +1,770 @@ +/* Copyright (C) 1991 Free Software Foundation, Inc. + +This file is part of GLD, the Gnu Linker. + +GLD 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 1, or (at your option) +any later version. + +GLD 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 GLD; see the file COPYING. If not, write to +the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ + +/* + $Id$ + + $Log$ + Revision 1.1 1991/03/21 21:28:34 gumby + Initial revision + + * Revision 1.1 1991/03/13 00:48:16 chrisb + * Initial revision + * + * Revision 1.6 1991/03/10 09:31:22 rich + * Modified Files: + * Makefile config.h ld-emul.c ld-emul.h ld-gld.c ld-gld960.c + * ld-lnk960.c ld.h lddigest.c ldexp.c ldexp.h ldfile.c ldfile.h + * ldgram.y ldinfo.h ldlang.c ldlang.h ldlex.h ldlex.l ldmain.c + * ldmain.h ldmisc.c ldmisc.h ldsym.c ldsym.h ldversion.c + * ldversion.h ldwarn.h ldwrite.c ldwrite.h y.tab.h + * + * As of this round of changes, ld now builds on all hosts of (Intel960) + * interest and copy passes my copy test on big endian hosts again. + * + * Revision 1.5 1991/03/09 03:25:04 sac + * Added support for LONG, SHORT and BYTE keywords in scripts + * + * Revision 1.4 1991/03/06 02:27:15 sac + * Added LONG, SHORT and BYTE keywords + * + * Revision 1.3 1991/02/22 17:14:59 sac + * Added RCS keywords and copyrights + * +*/ + +/* + * Written by Steve Chamberlain + * steve@cygnus.com + * + * This module handles expression trees. + */ + + +#include "sysdep.h" +#include "bfd.h" + +#include "ld.h" +#include "ldmain.h" +#include "ldmisc.h" +#include "ldexp.h" +#include "ldgram.tab.h" +#include "ldsym.h" +#include "ldlang.h" + +extern char *output_filename; +extern unsigned int undefined_global_sym_count; +extern unsigned int defined_global_sym_count; +extern bfd *output_bfd; +extern size_t largest_section; +extern lang_statement_list_type file_chain; +extern args_type command_line; +extern ld_config_type config; + +extern lang_input_statement_type *script_file; +extern unsigned int defined_global_sym_count; + +extern bfd_vma print_dot; + + +static void +exp_print_token(outfile, code) +FILE *outfile; +token_code_type code; +{ + static struct { + token_code_type code; + char *name; + } table[] = + { + INT, "int", + CHAR,"char", + NAME,"NAME", + PLUSEQ,"+=", + MINUSEQ,"-=", + MULTEQ,"*=", + DIVEQ,"/=", + LSHIFTEQ,"<<=", + RSHIFTEQ,">>=", + ANDEQ,"&=", + OREQ,"|=", + OROR,"||", + ANDAND,"&&", + EQ,"==", + NE,"!=", + LE,"<=", + GE,">=", + LSHIFT,"<<", + RSHIFT,">>=", + ALIGN_K,"ALIGN", + BLOCK,"BLOCK", + SECTIONS,"SECTIONS", + ALIGNMENT,"ALIGNMENT", + SIZEOF_HEADERS,"SIZEOF_HEADERS", + NEXT,"NEXT", + SIZEOF,"SIZEOF", + ADDR,"ADDR", + MEMORY,"MEMORY", + DSECT,"DSECT", + NOLOAD,"NOLOAD", + COPY,"COPY", + INFO,"INFO", + OVERLAY,"OVERLAY", + DEFINED,"DEFINED", + TARGET_K,"TARGET", + SEARCH_DIR,"SEARCH_DIR", + MAP,"MAP", + LONG,"LONG", + SHORT,"SHORT", + BYTE,"BYTE", + ENTRY,"ENTRY", + 0,(char *)NULL} ; + + + + unsigned int idx; + for (idx = 0; table[idx].name != (char*)NULL; idx++) { + if (table[idx].code == code) { + fprintf(outfile, "%s", table[idx].name); + return; + } + } + /* Not in table, just print it alone */ + fprintf(outfile, "%c",code); +} + +static void +make_abs(ptr) +etree_value_type *ptr; +{ + if (ptr->section != (lang_output_section_statement_type *)NULL) { + asection *s = ptr->section->bfd_section; + ptr->value += s->vma; + ptr->section = (lang_output_section_statement_type *)NULL; + } + +} +static +etree_value_type new_abs(value) +bfd_vma value; +{ + etree_value_type new; + new.valid = true; + new.section = (lang_output_section_statement_type *)NULL; + new.value = value; + return new; +} + +static void check(os) +lang_output_section_statement_type *os; +{ + if (os == (lang_output_section_statement_type *)NULL) { + info("%F%P undefined section"); + } + if (os->processed == false) { + info("%F%P forward reference of section"); + } +} + +etree_type *exp_intop(value) +bfd_vma value; +{ + etree_type *new = (etree_type *)ldmalloc(sizeof(new->value)); + new->type.node_code = INT; + new->value.value = value; + new->type.node_class = etree_value; + return new; + +} + + +static +etree_value_type new_rel(value, section) +bfd_vma value; +lang_output_section_statement_type *section; +{ + etree_value_type new; + new.valid = true; + new.value = value; + new.section = section; + return new; +} + +static +etree_value_type new_rel_from_section(value, section) +bfd_vma value; +lang_output_section_statement_type *section; +{ + etree_value_type new; + new.valid = true; + new.value = value; + new.section = section; + if (new.section != (lang_output_section_statement_type *)NULL) { + new.value -= section->bfd_section->vma; + } + return new; +} + +static etree_value_type +fold_binary(tree, current_section, allocation_done, dot, dotp) +etree_type *tree; +lang_output_section_statement_type *current_section; +lang_phase_type allocation_done; +bfd_vma dot; +bfd_vma *dotp; +{ + etree_value_type result; + + result = exp_fold_tree(tree->binary.lhs, current_section, + allocation_done, dot, dotp); + if (result.valid) { + etree_value_type other; + other = exp_fold_tree(tree->binary.rhs, + current_section, + allocation_done, dot,dotp) ; + if (other.valid) { + /* If values are from different sections, or this is an */ + /* absolute expression, make both source args absolute */ + if (result.section != other.section || + current_section == (lang_output_section_statement_type *)NULL) { + + make_abs(&result); + make_abs(&other); + } + + switch (tree->type.node_code) + { + case '%': + /* Mod, both absolule*/ + + if (other.value == 0) { + info("%F%S % by zero\n"); + } + result.value %= other.value; + break; + case '/': + if (other.value == 0) { + info("%F%S / by zero\n"); + } + result.value /= other.value; + break; +#define BOP(x,y) case x : result.value = result.value y other.value;break; + BOP('+',+); + BOP('*',*); + BOP('-',-); + BOP(LSHIFT,<<); + BOP(RSHIFT,>>); + BOP(EQ,==); + BOP(NE,!=); + BOP('<',<); + BOP('>',>); + BOP(LE,<=); + BOP(GE,>=); + BOP('&',&); + BOP('^',^); + BOP('|',|); + BOP(ANDAND,&&); + BOP(OROR,||); + default: + FAIL(); + } + } + } + return result; +} +etree_value_type invalid() +{ + etree_value_type new; + new.valid = false; + return new; +} + +etree_value_type fold_name(tree, current_section, allocation_done, dot) +etree_type *tree; +lang_output_section_statement_type *current_section; +lang_phase_type allocation_done; +bfd_vma dot; + +{ + etree_value_type result; + switch (tree->type.node_code) + { + case DEFINED: + result.value = + ldsym_get_soft(tree->name.name) != (ldsym_type *)NULL; + result.section = 0; + result.valid = true; + break; + case NAME: + result.valid = false; + if (tree->name.name[0] == '.' && tree->name.name[1] == 0) { + + if (allocation_done != lang_first_phase_enum) { + result = new_rel_from_section(dot, current_section); + } + else { + result = invalid(); + } + } + else { + if (allocation_done == lang_final_phase_enum) { + ldsym_type *sy = ldsym_get_soft(tree->name.name); + + if (sy) { + asymbol **sdefp = sy->sdefs_chain; + + if (sdefp) { + asymbol *sdef = *sdefp; + if (sdef->section == (asection *)NULL) { + /* This is an absolute symbol */ + result = new_abs(sdef->value); + } + else { + lang_output_section_statement_type *os = + lang_output_section_statement_lookup( sdef->section->output_section->name); + result = new_rel(sdef->value, os); + } + } + } + if (result.valid == false) { + info("%F%S: undefined symbol `%s' referenced in expression.\n", + tree->name.name); + } + + } + } + + break; + + case ADDR: + + if (allocation_done != lang_first_phase_enum) { + lang_output_section_statement_type *os = + lang_output_section_find(tree->name.name); + check(os); + result = new_rel((bfd_vma)0, os); + } + else { + result = invalid(); + } + break; + case SIZEOF: + if(allocation_done != lang_first_phase_enum) { + lang_output_section_statement_type *os = + lang_output_section_find(tree->name.name); + check(os); + result = new_abs((bfd_vma)(os->bfd_section->size)); + } + else { + result = invalid(); + } + break; + + default: + FAIL(); + break; + } + + return result; +} +etree_value_type exp_fold_tree(tree, current_section, allocation_done, + dot, dotp) +etree_type *tree; +lang_output_section_statement_type *current_section; +lang_phase_type allocation_done; +bfd_vma dot; +bfd_vma *dotp; +{ + etree_value_type result; + + if (tree == (etree_type *)NULL) { + result.valid = false; + } + else { + switch (tree->type.node_class) + { + case etree_value: + result = new_rel(tree->value.value, current_section); + break; + case etree_unary: + result = exp_fold_tree(tree->unary.child, + current_section, + allocation_done, dot, dotp); + if (result.valid == true) + { + switch(tree->type.node_code) + { + case ALIGN_K: + if (allocation_done != lang_first_phase_enum) { + result = new_rel_from_section(ALIGN(dot, + result.value) , + current_section); + + } + else { + result.valid = false; + } + break; + case '-': + result.value = -result.value; + break; + case NEXT: + result.valid = false; + break; + default: + FAIL(); + } + } + + break; + case etree_trinary: + + result = exp_fold_tree(tree->trinary.cond, + current_section, + allocation_done, dot, dotp); + if (result.valid) { + result = exp_fold_tree(result.value ? + tree->trinary.lhs:tree->trinary.rhs, + current_section, + allocation_done, dot, dotp); + } + + break; + case etree_binary: + result = fold_binary(tree, current_section, allocation_done, + dot, dotp); + break; + case etree_assign: + if (tree->assign.dst[0] == '.' && tree->assign.dst[1] == 0) { + /* Assignment to dot can only be done during allocation */ + if (allocation_done == lang_allocating_phase_enum) { + result = exp_fold_tree(tree->assign.src, + current_section, + lang_allocating_phase_enum, dot, dotp); + if (result.valid == false) { + info("%F%S invalid assignment to location counter\n"); + } + else { + if (current_section == + (lang_output_section_statement_type *)NULL) { + info("%F%S assignment to location counter invalid outside of SECTION\n"); + } + else { + unsigned long nextdot =result.value + + current_section->bfd_section->vma; + if (nextdot < dot) { + info("%F%S cannot move location counter backwards"); + } + else { + *dotp = nextdot; + } + } + } + } + } + else { + ldsym_type *sy = ldsym_get(tree->assign.dst); + + /* If this symbol has just been created then we'll place it into + * a section of our choice + */ + result = exp_fold_tree(tree->assign.src, + current_section, allocation_done, + dot, dotp); + if (result.valid) + { + asymbol *def; + asymbol **def_ptr = (asymbol **)ldmalloc(sizeof(asymbol **)); + /* Add this definition to script file */ + def = (asymbol *)bfd_make_empty_symbol(script_file->the_bfd); + *def_ptr = def; + + + def->value = result.value; + if (result.section != + (lang_output_section_statement_type *)NULL) { + if (current_section != + (lang_output_section_statement_type *)NULL) { + + def->section = result.section->bfd_section; + def->flags = BSF_GLOBAL | BSF_EXPORT; + } + else { + /* Force to absolute */ + def->value += result.section->bfd_section->vma; + def->section = (asection *)NULL; + def->flags = BSF_GLOBAL | BSF_EXPORT | BSF_ABSOLUTE; + } + + + } + else { + def->section = (asection *)NULL; + def->flags = BSF_GLOBAL | BSF_EXPORT | BSF_ABSOLUTE; + } + + + def->udata = (void *)NULL; + def->name = sy->name; + Q_enter_global_ref(def_ptr); + } + + } + + + break; + case etree_name: + result = fold_name(tree, current_section, allocation_done, dot); + break; + default: + info("%F%S Need more of these %d",tree->type.node_class ); + + } + } + + return result; +} + + +etree_value_type exp_fold_tree_no_dot(tree, current_section, allocation_done) +etree_type *tree; +lang_output_section_statement_type *current_section; +lang_phase_type allocation_done; +{ +return exp_fold_tree(tree, current_section, allocation_done, (bfd_vma) + 0, (bfd_vma *)NULL); +} + +etree_type * +exp_binop(code, lhs, rhs) +int code; +etree_type *lhs; +etree_type *rhs; +{ + etree_type value, *new; + etree_value_type r; + + value.type.node_code = code; + value.binary.lhs = lhs; + value.binary.rhs = rhs; + value.type.node_class = etree_binary; + r = exp_fold_tree_no_dot(&value, (lang_output_section_statement_type *)NULL, + lang_first_phase_enum ); + if (r.valid) + { + return exp_intop(r.value); + } + new = (etree_type *)ldmalloc(sizeof(new->binary)); + memcpy((char *)new, (char *)&value, sizeof(new->binary)); + return new; +} + +etree_type * +exp_trinop(code, cond, lhs, rhs) +int code; +etree_type *cond; +etree_type *lhs; +etree_type *rhs; +{ + etree_type value, *new; + etree_value_type r; + value.type.node_code = code; + value.trinary.lhs = lhs; + value.trinary.cond = cond; + value.trinary.rhs = rhs; + value.type.node_class = etree_trinary; + r= exp_fold_tree_no_dot(&value, (lang_output_section_statement_type + *)NULL,lang_first_phase_enum); + if (r.valid) { + return exp_intop(r.value); + } + new = (etree_type *)ldmalloc(sizeof(new->trinary)); + memcpy((char *)new,(char *) &value, sizeof(new->trinary)); + return new; +} + + +etree_type * +exp_unop(code, child) +int code; +etree_type *child; +{ + etree_type value, *new; + + etree_value_type r; + value.unary.type.node_code = code; + value.unary.child = child; + value.unary.type.node_class = etree_unary; +r = exp_fold_tree_no_dot(&value,(lang_output_section_statement_type *)NULL, + lang_first_phase_enum); +if (r.valid) { + return exp_intop(r.value); + } + new = (etree_type *)ldmalloc(sizeof(new->unary)); + memcpy((char *)new, (char *)&value, sizeof(new->unary)); + return new; +} + + +etree_type * +exp_nameop(code, name) +int code; +char *name; +{ + + etree_type value, *new; + + etree_value_type r; + value.name.type.node_code = code; + value.name.name = name; + value.name.type.node_class = etree_name; + + + r = exp_fold_tree_no_dot(&value,(lang_output_section_statement_type *)NULL, + lang_first_phase_enum); + if (r.valid) { + return exp_intop(r.value); + } + new = (etree_type *)ldmalloc(sizeof(new->name)); + memcpy((char *)new, (char *)&value, sizeof(new->name)); + return new; + +} + + + + +etree_type * +exp_assop(code, dst, src) +int code; +char *dst; +etree_type *src; +{ + etree_type value, *new; + + value.assign.type.node_code = code; + + + value.assign.src = src; + value.assign.dst = dst; + value.assign.type.node_class = etree_assign; + +#if 0 + if (exp_fold_tree_no_dot(&value, &result)) { + return exp_intop(result); + } +#endif + new = (etree_type*)ldmalloc(sizeof(new->assign)); + memcpy((char *)new, (char *)&value, sizeof(new->assign)); + return new; +} + +void +exp_print_tree(outfile, tree) +FILE *outfile; +etree_type *tree; +{ + switch (tree->type.node_class) { + case etree_value: + fprintf(outfile,"0x%08lx",(bfd_vma)(tree->value.value)); + return; + case etree_assign: +#if 0 + if (tree->assign.dst->sdefs != (asymbol *)NULL){ + fprintf(outfile,"%s (%x) ",tree->assign.dst->name, + tree->assign.dst->sdefs->value); + } + else { + fprintf(outfile,"%s (UNDEFINED)",tree->assign.dst->name); + } +#endif + fprintf(outfile,"%s ",tree->assign.dst); + exp_print_token(outfile,tree->type.node_code); + exp_print_tree(outfile,tree->assign.src); + break; + case etree_binary: + exp_print_tree(outfile,tree->binary.lhs); + exp_print_token(outfile,tree->type.node_code); + exp_print_tree(outfile,tree->binary.rhs); + break; + case etree_trinary: + exp_print_tree(outfile,tree->trinary.cond); + fprintf(outfile,"?"); + exp_print_tree(outfile,tree->trinary.lhs); + fprintf(outfile,":"); + exp_print_tree(outfile,tree->trinary.rhs); + break; + case etree_unary: + exp_print_token(outfile,tree->unary.type.node_code); + fprintf(outfile,"("); + exp_print_tree(outfile,tree->unary.child); + fprintf(outfile,")"); + break; + case etree_undef: + fprintf(outfile,"????????"); + break; + case etree_name: + if (tree->type.node_code == NAME) { + fprintf(outfile,"%s", tree->name.name); + } + else { + exp_print_token(outfile,tree->type.node_code); + fprintf(outfile,"(%s)", tree->name.name); + } + break; + default: + FAIL(); + break; + } +} + + + + +bfd_vma +exp_get_vma(tree, def, name, allocation_done) +etree_type *tree; +bfd_vma def; +char *name; +lang_phase_type allocation_done; +{ + etree_value_type r; + + if (tree != (etree_type *)NULL) { + r = exp_fold_tree_no_dot(tree, + (lang_output_section_statement_type *)NULL, + allocation_done); + if (r.valid == false && name) { + info("%F%S Nonconstant expression for %s\n",name); + } + return r.value; + } + else { + return def; + } +} + +int +exp_get_value_int(tree,def,name, allocation_done) +etree_type *tree; +int def; +char *name; +lang_phase_type allocation_done; +{ + return (int)exp_get_vma(tree,(bfd_vma)def,name, allocation_done); +} |