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212 lines
5.9 KiB
212 lines
5.9 KiB
/* |
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* LC-3b architecture description |
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* |
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* Copyright (C) 2003-2007 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.h> |
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#include "lc3barch.h" |
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yasm_arch_module yasm_lc3b_LTX_arch; |
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static /*@only@*/ yasm_arch * |
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lc3b_create(const char *machine, const char *parser, |
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/*@out@*/ yasm_arch_create_error *error) |
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{ |
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yasm_arch_base *arch; |
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*error = YASM_ARCH_CREATE_OK; |
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if (yasm__strcasecmp(machine, "lc3b") != 0) { |
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*error = YASM_ARCH_CREATE_BAD_MACHINE; |
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return NULL; |
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} |
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if (yasm__strcasecmp(parser, "nasm") != 0) { |
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*error = YASM_ARCH_CREATE_BAD_PARSER; |
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return NULL; |
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} |
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arch = yasm_xmalloc(sizeof(yasm_arch_base)); |
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arch->module = &yasm_lc3b_LTX_arch; |
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return (yasm_arch *)arch; |
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} |
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static void |
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lc3b_destroy(/*@only@*/ yasm_arch *arch) |
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{ |
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yasm_xfree(arch); |
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} |
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static const char * |
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lc3b_get_machine(/*@unused@*/ const yasm_arch *arch) |
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{ |
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return "lc3b"; |
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} |
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static unsigned int |
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lc3b_get_address_size(/*@unused@*/ const yasm_arch *arch) |
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{ |
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return 16; |
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} |
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static int |
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lc3b_set_var(yasm_arch *arch, const char *var, unsigned long val) |
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{ |
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return 1; |
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} |
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static const unsigned char ** |
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lc3b_get_fill(const yasm_arch *arch) |
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{ |
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/* NOP pattern is all 0's per LC-3b Assembler 3.50 output */ |
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static const unsigned char *fill[16] = { |
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NULL, /* unused */ |
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NULL, /* 1 - illegal; all opcodes are 2 bytes long */ |
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(const unsigned char *) |
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"\x00\x00", /* 4 */ |
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NULL, /* 3 - illegal */ |
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(const unsigned char *) |
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"\x00\x00\x00\x00", /* 4 */ |
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NULL, /* 5 - illegal */ |
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(const unsigned char *) |
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"\x00\x00\x00\x00\x00\x00", /* 6 */ |
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NULL, /* 7 - illegal */ |
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(const unsigned char *) |
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"\x00\x00\x00\x00\x00\x00" /* 8 */ |
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"\x00\x00", |
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NULL, /* 9 - illegal */ |
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(const unsigned char *) |
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"\x00\x00\x00\x00\x00\x00" /* 10 */ |
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"\x00\x00\x00\x00", |
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NULL, /* 11 - illegal */ |
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(const unsigned char *) |
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"\x00\x00\x00\x00\x00\x00" /* 12 */ |
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"\x00\x00\x00\x00\x00\x00", |
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NULL, /* 13 - illegal */ |
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(const unsigned char *) |
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"\x00\x00\x00\x00\x00\x00" /* 14 */ |
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"\x00\x00\x00\x00\x00\x00\x00\x00", |
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NULL /* 15 - illegal */ |
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}; |
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return fill; |
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} |
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static unsigned int |
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lc3b_get_reg_size(/*@unused@*/ yasm_arch *arch, /*@unused@*/ uintptr_t reg) |
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{ |
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return 16; |
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} |
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static uintptr_t |
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lc3b_reggroup_get_reg(/*@unused@*/ yasm_arch *arch, |
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/*@unused@*/ uintptr_t reggroup, |
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/*@unused@*/ unsigned long regindex) |
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{ |
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return 0; |
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} |
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static void |
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lc3b_reg_print(/*@unused@*/ yasm_arch *arch, uintptr_t reg, FILE *f) |
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{ |
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fprintf(f, "r%u", (unsigned int)(reg&7)); |
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} |
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static int |
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lc3b_floatnum_tobytes(yasm_arch *arch, const yasm_floatnum *flt, |
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unsigned char *buf, size_t destsize, size_t valsize, |
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size_t shift, int warn) |
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{ |
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yasm_error_set(YASM_ERROR_FLOATING_POINT, |
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N_("LC-3b does not support floating point")); |
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return 1; |
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} |
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static yasm_effaddr * |
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lc3b_ea_create_expr(yasm_arch *arch, yasm_expr *e) |
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{ |
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yasm_effaddr *ea = yasm_xmalloc(sizeof(yasm_effaddr)); |
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yasm_value_initialize(&ea->disp, e, 0); |
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ea->need_nonzero_len = 0; |
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ea->need_disp = 1; |
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ea->nosplit = 0; |
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ea->strong = 0; |
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ea->segreg = 0; |
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ea->pc_rel = 0; |
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ea->not_pc_rel = 0; |
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return ea; |
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} |
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void |
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yasm_lc3b__ea_destroy(/*@only@*/ yasm_effaddr *ea) |
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{ |
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yasm_value_delete(&ea->disp); |
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yasm_xfree(ea); |
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} |
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static void |
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lc3b_ea_print(const yasm_effaddr *ea, FILE *f, int indent_level) |
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{ |
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fprintf(f, "%*sDisp:\n", indent_level, ""); |
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yasm_value_print(&ea->disp, f, indent_level+1); |
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} |
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/* Define lc3b machines -- see arch.h for details */ |
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static yasm_arch_machine lc3b_machines[] = { |
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{ "LC-3b", "lc3b" }, |
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{ NULL, NULL } |
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}; |
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/* Define arch structure -- see arch.h for details */ |
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yasm_arch_module yasm_lc3b_LTX_arch = { |
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"LC-3b", |
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"lc3b", |
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NULL, |
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lc3b_create, |
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lc3b_destroy, |
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lc3b_get_machine, |
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lc3b_get_address_size, |
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lc3b_set_var, |
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yasm_lc3b__parse_check_insnprefix, |
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yasm_lc3b__parse_check_regtmod, |
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lc3b_get_fill, |
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lc3b_floatnum_tobytes, |
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yasm_lc3b__intnum_tobytes, |
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lc3b_get_reg_size, |
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lc3b_reggroup_get_reg, |
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lc3b_reg_print, |
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NULL, /*yasm_lc3b__segreg_print*/ |
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lc3b_ea_create_expr, |
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yasm_lc3b__ea_destroy, |
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lc3b_ea_print, |
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yasm_lc3b__create_empty_insn, |
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lc3b_machines, |
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"lc3b", |
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16, |
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2 |
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};
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