153 lines
4.8 KiB
C
153 lines
4.8 KiB
C
/*
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* ORG bytecode
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*
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* Copyright (C) 2005-2007 Peter Johnson
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND OTHER CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR OTHER CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "util.h"
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#include "libyasm-stdint.h"
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#include "coretype.h"
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#include "file.h"
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#include "errwarn.h"
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#include "intnum.h"
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#include "expr.h"
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#include "value.h"
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#include "bytecode.h"
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typedef struct bytecode_org {
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unsigned long start; /* target starting offset within section */
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unsigned long fill; /* fill value */
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} bytecode_org;
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static void bc_org_destroy(void *contents);
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static void bc_org_print(const void *contents, FILE *f, int indent_level);
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static void bc_org_finalize(yasm_bytecode *bc, yasm_bytecode *prev_bc);
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static int bc_org_calc_len(yasm_bytecode *bc, yasm_bc_add_span_func add_span,
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void *add_span_data);
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static int bc_org_expand(yasm_bytecode *bc, int span, long old_val,
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long new_val, /*@out@*/ long *neg_thres,
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/*@out@*/ long *pos_thres);
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static int bc_org_tobytes(yasm_bytecode *bc, unsigned char **bufp,
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unsigned char *bufstart, void *d,
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yasm_output_value_func output_value,
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/*@null@*/ yasm_output_reloc_func output_reloc);
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static const yasm_bytecode_callback bc_org_callback = {
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bc_org_destroy,
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bc_org_print,
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bc_org_finalize,
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NULL,
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bc_org_calc_len,
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bc_org_expand,
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bc_org_tobytes,
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YASM_BC_SPECIAL_OFFSET
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};
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static void
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bc_org_destroy(void *contents)
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{
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yasm_xfree(contents);
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}
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static void
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bc_org_print(const void *contents, FILE *f, int indent_level)
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{
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const bytecode_org *org = (const bytecode_org *)contents;
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fprintf(f, "%*s_Org_\n", indent_level, "");
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fprintf(f, "%*sStart=%lu\n", indent_level, "", org->start);
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}
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static void
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bc_org_finalize(yasm_bytecode *bc, yasm_bytecode *prev_bc)
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{
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}
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static int
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bc_org_calc_len(yasm_bytecode *bc, yasm_bc_add_span_func add_span,
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void *add_span_data)
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{
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bytecode_org *org = (bytecode_org *)bc->contents;
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long neg_thres = 0;
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long pos_thres = org->start;
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if (bc_org_expand(bc, 0, 0, (long)bc->offset, &neg_thres, &pos_thres) < 0)
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return -1;
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return 0;
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}
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static int
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bc_org_expand(yasm_bytecode *bc, int span, long old_val, long new_val,
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/*@out@*/ long *neg_thres, /*@out@*/ long *pos_thres)
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{
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bytecode_org *org = (bytecode_org *)bc->contents;
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/* Check for overrun */
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if ((unsigned long)new_val > org->start) {
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yasm_error_set(YASM_ERROR_GENERAL,
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N_("ORG overlap with already existing data"));
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return -1;
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}
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/* Generate space to start offset */
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bc->len = org->start - new_val;
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return 1;
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}
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static int
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bc_org_tobytes(yasm_bytecode *bc, unsigned char **bufp,
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unsigned char *bufstart, void *d,
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yasm_output_value_func output_value,
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/*@unused@*/ yasm_output_reloc_func output_reloc)
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{
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bytecode_org *org = (bytecode_org *)bc->contents;
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unsigned long len, i;
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/* Sanity check for overrun */
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if (bc->offset > org->start) {
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yasm_error_set(YASM_ERROR_GENERAL,
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N_("ORG overlap with already existing data"));
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return 1;
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}
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len = org->start - bc->offset;
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for (i=0; i<len; i++)
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YASM_WRITE_8(*bufp, org->fill); /* XXX: handle more than 8 bit? */
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return 0;
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}
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yasm_bytecode *
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yasm_bc_create_org(unsigned long start, unsigned long fill, unsigned long line)
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{
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bytecode_org *org = yasm_xmalloc(sizeof(bytecode_org));
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org->start = start;
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org->fill = fill;
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return yasm_bc_create_common(&bc_org_callback, org, line);
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}
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