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minix/commands/asmconv/parse_gnu.c
Arun Thomas 5706670029 Convert boot/ and commands/ over to bsdmake
2010-05-12 16:28:54 +00:00

880 lines
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/* parse_ack.c - parse GNU assembly Author: R.S. Veldema
* <rveldema@cs.vu.nl>
* 26 Aug 1996
*/
#define nil 0
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <assert.h>
#include "asmconv.h"
#include "token.h"
#include "asm86.h"
#include "languages.h"
typedef struct mnemonic { /* GNU as86 mnemonics translation table. */
char *name;
opcode_t opcode;
optype_t optype;
} mnemonic_t;
static mnemonic_t mnemtab[] = { /* This array is sorted. */
{ ".align", DOT_ALIGN, PSEUDO },
{ ".ascii", DOT_ASCII, PSEUDO },
{ ".asciz", DOT_ASCIZ, PSEUDO },
{ ".assert", DOT_ASSERT, PSEUDO },
{ ".base", DOT_BASE, PSEUDO },
{ ".bss", DOT_BSS, PSEUDO },
{ ".byte", DOT_DATA1, PSEUDO },
{ ".comm", DOT_COMM, PSEUDO },
{ ".data", DOT_DATA, PSEUDO },
{ ".data1", DOT_DATA1, PSEUDO },
{ ".data2", DOT_DATA2, PSEUDO },
{ ".data4", DOT_DATA4, PSEUDO },
{ ".end", DOT_END, PSEUDO },
{ ".extern", DOT_EXTERN, PSEUDO },
{ ".file", DOT_FILE, PSEUDO },
{ ".globl", DOT_DEFINE, PSEUDO },
{ ".lcomm", DOT_LCOMM, PSEUDO },
{ ".line", DOT_LINE, PSEUDO },
{ ".list", DOT_LIST, PSEUDO },
{ ".long", DOT_DATA4, PSEUDO },
{ ".nolist", DOT_NOLIST, PSEUDO },
{ ".rom", DOT_ROM, PSEUDO },
{ ".space", DOT_SPACE, PSEUDO },
{ ".symb", DOT_SYMB, PSEUDO },
{ ".text", DOT_TEXT, PSEUDO },
{ ".word", DOT_DATA2, PSEUDO },
{ "aaa", AAA, WORD },
{ "aad", AAD, WORD },
{ "aam", AAM, WORD },
{ "aas", AAS, WORD },
{ "adcb", ADC, BYTE },
{ "adcl", ADC, WORD },
{ "adcw", ADC, OWORD },
{ "addb", ADD, BYTE },
{ "addl", ADD, WORD },
{ "addw", ADD, OWORD },
{ "andb", AND, BYTE },
{ "andl", AND, WORD },
{ "andw", AND, OWORD },
{ "arpl", ARPL, WORD },
{ "bound", BOUND, WORD },
{ "bsf", BSF, WORD },
{ "bsr", BSR, WORD },
{ "bswap", BSWAP, WORD },
{ "btc", BTC, WORD },
{ "btl", BT, WORD },
{ "btr", BTR, WORD },
{ "bts", BTS, WORD },
{ "btw", BT, OWORD },
{ "call", CALL, JUMP },
{ "callf", CALLF, JUMP },
{ "cbtw", CBW, OWORD },
{ "cbw", CBW, WORD },
{ "cdq", CWD, WORD },
{ "clc", CLC, WORD },
{ "cld", CLD, WORD },
{ "cli", CLI, WORD },
{ "cltd", CWD, WORD },
{ "clts", CLTS, WORD },
{ "cmc", CMC, WORD },
{ "cmpb", CMP, BYTE },
{ "cmpl", CMP, WORD },
{ "cmps", CMPS, WORD },
{ "cmpsb", CMPS, BYTE },
{ "cmpw", CMP, OWORD },
{ "cmpxchg", CMPXCHG, WORD },
{ "cwd", CWD, WORD },
{ "cwde", CBW, WORD },
{ "cwtd", CWD, OWORD },
{ "cwtl", CBW, WORD },
{ "daa", DAA, WORD },
{ "das", DAS, WORD },
{ "decb", DEC, BYTE },
{ "decl", DEC, WORD },
{ "decw", DEC, OWORD },
{ "divb", DIV, BYTE },
{ "divl", DIV, WORD },
{ "divw", DIV, OWORD },
{ "enter", ENTER, WORD },
{ "f2xm1", F2XM1, WORD },
{ "fabs", FABS, WORD },
{ "fadd", FADD, WORD },
{ "faddd", FADDD, WORD },
{ "faddp", FADDP, WORD },
{ "fadds", FADDS, WORD },
{ "fbld", FBLD, WORD },
{ "fbstp", FBSTP, WORD },
{ "fchs", FCHS, WORD },
{ "fcomd", FCOMD, WORD },
{ "fcompd", FCOMPD, WORD },
{ "fcompp", FCOMPP, WORD },
{ "fcomps", FCOMPS, WORD },
{ "fcoms", FCOMS, WORD },
{ "fcos", FCOS, WORD },
{ "fdecstp", FDECSTP, WORD },
{ "fdivd", FDIVD, WORD },
{ "fdivp", FDIVP, WORD },
{ "fdivrd", FDIVRD, WORD },
{ "fdivrp", FDIVRP, WORD },
{ "fdivrs", FDIVRS, WORD },
{ "fdivs", FDIVS, WORD },
{ "ffree", FFREE, WORD },
{ "fiaddl", FIADDL, WORD },
{ "fiadds", FIADDS, WORD },
{ "ficom", FICOM, WORD },
{ "ficomp", FICOMP, WORD },
{ "fidivl", FIDIVL, WORD },
{ "fidivrl", FIDIVRL, WORD },
{ "fidivrs", FIDIVRS, WORD },
{ "fidivs", FIDIVS, WORD },
{ "fildl", FILDL, WORD },
{ "fildq", FILDQ, WORD },
{ "filds", FILDS, WORD },
{ "fimull", FIMULL, WORD },
{ "fimuls", FIMULS, WORD },
{ "fincstp", FINCSTP, WORD },
{ "fistl", FISTL, WORD },
{ "fistp", FISTP, WORD },
{ "fists", FISTS, WORD },
{ "fisubl", FISUBL, WORD },
{ "fisubrl", FISUBRL, WORD },
{ "fisubrs", FISUBRS, WORD },
{ "fisubs", FISUBS, WORD },
{ "fld1", FLD1, WORD },
{ "fldcw", FLDCW, WORD },
{ "fldd", FLDD, WORD },
{ "fldenv", FLDENV, WORD },
{ "fldl2e", FLDL2E, WORD },
{ "fldl2t", FLDL2T, WORD },
{ "fldlg2", FLDLG2, WORD },
{ "fldln2", FLDLN2, WORD },
{ "fldpi", FLDPI, WORD },
{ "flds", FLDS, WORD },
{ "fldx", FLDX, WORD },
{ "fldz", FLDZ, WORD },
{ "fmuld", FMULD, WORD },
{ "fmulp", FMULP, WORD },
{ "fmuls", FMULS, WORD },
{ "fnclex", FCLEX, WORD },
{ "fninit", FINIT, WORD },
{ "fnop", FNOP, WORD },
{ "fnsave", FSAVE, WORD },
{ "fnstcw", FSTCW, WORD },
{ "fnstenv", FSTENV, WORD },
{ "fpatan", FPATAN, WORD },
{ "fprem", FPREM, WORD },
{ "fprem1", FPREM1, WORD },
{ "fptan", FPTAN, WORD },
{ "frndint", FRNDINT, WORD },
{ "frstor", FRSTOR, WORD },
{ "fscale", FSCALE, WORD },
{ "fsin", FSIN, WORD },
{ "fsincos", FSINCOS, WORD },
{ "fsqrt", FSQRT, WORD },
{ "fstd", FSTD, WORD },
{ "fstpd", FSTPD, WORD },
{ "fstps", FSTPS, WORD },
{ "fstpx", FSTPX, WORD },
{ "fsts", FSTS, WORD },
{ "fstsw", FSTSW, WORD },
{ "fsubd", FSUBD, WORD },
{ "fsubp", FSUBP, WORD },
{ "fsubpr", FSUBPR, WORD },
{ "fsubrd", FSUBRD, WORD },
{ "fsubrs", FSUBRS, WORD },
{ "fsubs", FSUBS, WORD },
{ "ftst", FTST, WORD },
{ "fucom", FUCOM, WORD },
{ "fucomp", FUCOMP, WORD },
{ "fucompp", FUCOMPP, WORD },
{ "fxam", FXAM, WORD },
{ "fxch", FXCH, WORD },
{ "fxtract", FXTRACT, WORD },
{ "fyl2x", FYL2X, WORD },
{ "fyl2xp1", FYL2XP1, WORD },
{ "hlt", HLT, WORD },
{ "idivb", IDIV, BYTE },
{ "idivl", IDIV, WORD },
{ "idivw", IDIV, OWORD },
{ "imulb", IMUL, BYTE },
{ "imull", IMUL, WORD },
{ "imulw", IMUL, OWORD },
{ "inb", IN, BYTE },
{ "incb", INC, BYTE },
{ "incl", INC, WORD },
{ "incw", INC, OWORD },
{ "inl", IN, WORD },
{ "insb", INS, BYTE },
{ "insl", INS, WORD },
{ "insw", INS, OWORD },
{ "int", INT, WORD },
{ "into", INTO, JUMP },
{ "invd", INVD, WORD },
{ "invlpg", INVLPG, WORD },
{ "inw", IN, OWORD },
{ "iret", IRET, JUMP },
{ "iretd", IRETD, JUMP },
{ "ja", JA, JUMP },
{ "jae", JAE, JUMP },
{ "jb", JB, JUMP },
{ "jbe", JBE, JUMP },
{ "jc", JB, JUMP },
{ "jcxz", JCXZ, JUMP },
{ "je", JE, JUMP },
{ "jecxz", JCXZ, JUMP },
{ "jg", JG, JUMP },
{ "jge", JGE, JUMP },
{ "jl", JL, JUMP },
{ "jle", JLE, JUMP },
{ "jmp", JMP, JUMP },
{ "jmpf", JMPF, JUMP },
{ "jna", JBE, JUMP },
{ "jnae", JB, JUMP },
{ "jnb", JAE, JUMP },
{ "jnbe", JA, JUMP },
{ "jnc", JAE, JUMP },
{ "jne", JNE, JUMP },
{ "jng", JLE, JUMP },
{ "jnge", JL, JUMP },
{ "jnl", JGE, JUMP },
{ "jnle", JG, JUMP },
{ "jno", JNO, JUMP },
{ "jnp", JNP, JUMP },
{ "jns", JNS, JUMP },
{ "jnz", JNE, JUMP },
{ "jo", JO, JUMP },
{ "jp", JP, JUMP },
{ "js", JS, JUMP },
{ "jz", JE, JUMP },
{ "lahf", LAHF, WORD },
{ "lar", LAR, WORD },
{ "lds", LDS, WORD },
{ "leal", LEA, WORD },
{ "leave", LEAVE, WORD },
{ "leaw", LEA, OWORD },
{ "les", LES, WORD },
{ "lfs", LFS, WORD },
{ "lgdt", LGDT, WORD },
{ "lgs", LGS, WORD },
{ "lidt", LIDT, WORD },
{ "lldt", LLDT, WORD },
{ "lmsw", LMSW, WORD },
{ "lock", LOCK, WORD },
{ "lods", LODS, WORD },
{ "lodsb", LODS, BYTE },
{ "loop", LOOP, JUMP },
{ "loope", LOOPE, JUMP },
{ "loopne", LOOPNE, JUMP },
{ "loopnz", LOOPNE, JUMP },
{ "loopz", LOOPE, JUMP },
{ "lsl", LSL, WORD },
{ "lss", LSS, WORD },
{ "ltr", LTR, WORD },
{ "movb", MOV, BYTE },
{ "movl", MOV, WORD },
{ "movsb", MOVS, BYTE },
{ "movsbl", MOVSXB, WORD },
{ "movsbw", MOVSXB, OWORD },
{ "movsl", MOVS, WORD },
{ "movsw", MOVS, OWORD },
{ "movswl", MOVSX, WORD },
{ "movw", MOV, OWORD },
{ "movzbl", MOVZXB, WORD },
{ "movzbw", MOVZXB, OWORD },
{ "movzwl", MOVZX, WORD },
{ "mulb", MUL, BYTE },
{ "mull", MUL, WORD },
{ "mulw", MUL, OWORD },
{ "negb", NEG, BYTE },
{ "negl", NEG, WORD },
{ "negw", NEG, OWORD },
{ "nop", NOP, WORD },
{ "notb", NOT, BYTE },
{ "notl", NOT, WORD },
{ "notw", NOT, OWORD },
{ "orb", OR, BYTE },
{ "orl", OR, WORD },
{ "orw", OR, OWORD },
{ "outb", OUT, BYTE },
{ "outl", OUT, WORD },
{ "outsb", OUTS, BYTE },
{ "outsl", OUTS, WORD },
{ "outsw", OUTS, OWORD },
{ "outw", OUT, OWORD },
{ "pop", POP, WORD },
{ "popa", POPA, WORD },
{ "popad", POPA, WORD },
{ "popf", POPF, WORD },
{ "popl", POP, WORD },
{ "push", PUSH, WORD },
{ "pusha", PUSHA, WORD },
{ "pushad", PUSHA, WORD },
{ "pushf", PUSHF, WORD },
{ "pushl", PUSH, WORD },
{ "rclb", RCL, BYTE },
{ "rcll", RCL, WORD },
{ "rclw", RCL, OWORD },
{ "rcrb", RCR, BYTE },
{ "rcrl", RCR, WORD },
{ "rcrw", RCR, OWORD },
{ "ret", RET, JUMP },
{ "retf", RETF, JUMP },
{ "rolb", ROL, BYTE },
{ "roll", ROL, WORD },
{ "rolw", ROL, OWORD },
{ "rorb", ROR, BYTE },
{ "rorl", ROR, WORD },
{ "rorw", ROR, OWORD },
{ "sahf", SAHF, WORD },
{ "salb", SAL, BYTE },
{ "sall", SAL, WORD },
{ "salw", SAL, OWORD },
{ "sarb", SAR, BYTE },
{ "sarl", SAR, WORD },
{ "sarw", SAR, OWORD },
{ "sbbb", SBB, BYTE },
{ "sbbl", SBB, WORD },
{ "sbbw", SBB, OWORD },
{ "scasb", SCAS, BYTE },
{ "scasl", SCAS, WORD },
{ "scasw", SCAS, OWORD },
{ "seta", SETA, BYTE },
{ "setae", SETAE, BYTE },
{ "setb", SETB, BYTE },
{ "setbe", SETBE, BYTE },
{ "sete", SETE, BYTE },
{ "setg", SETG, BYTE },
{ "setge", SETGE, BYTE },
{ "setl", SETL, BYTE },
{ "setna", SETBE, BYTE },
{ "setnae", SETB, BYTE },
{ "setnb", SETAE, BYTE },
{ "setnbe", SETA, BYTE },
{ "setne", SETNE, BYTE },
{ "setng", SETLE, BYTE },
{ "setnge", SETL, BYTE },
{ "setnl", SETGE, BYTE },
{ "setnle", SETG, BYTE },
{ "setno", SETNO, BYTE },
{ "setnp", SETNP, BYTE },
{ "setns", SETNS, BYTE },
{ "seto", SETO, BYTE },
{ "setp", SETP, BYTE },
{ "sets", SETS, BYTE },
{ "setz", SETE, BYTE },
{ "sgdt", SGDT, WORD },
{ "shlb", SHL, BYTE },
{ "shldl", SHLD, WORD },
{ "shll", SHL, WORD },
{ "shlw", SHL, OWORD },
{ "shrb", SHR, BYTE },
{ "shrdl", SHRD, WORD },
{ "shrl", SHR, WORD },
{ "shrw", SHR, OWORD },
{ "sidt", SIDT, WORD },
{ "sldt", SLDT, WORD },
{ "smsw", SMSW, WORD },
{ "stc", STC, WORD },
{ "std", STD, WORD },
{ "sti", STI, WORD },
{ "stosb", STOS, BYTE },
{ "stosl", STOS, WORD },
{ "stosw", STOS, OWORD },
{ "str", STR, WORD },
{ "subb", SUB, BYTE },
{ "subl", SUB, WORD },
{ "subw", SUB, OWORD },
{ "testb", TEST, BYTE },
{ "testl", TEST, WORD },
{ "testw", TEST, OWORD },
{ "verr", VERR, WORD },
{ "verw", VERW, WORD },
{ "wait", WAIT, WORD },
{ "wbinvd", WBINVD, WORD },
{ "xadd", XADD, WORD },
{ "xchgb", XCHG, BYTE },
{ "xchgl", XCHG, WORD },
{ "xchgw", XCHG, OWORD },
{ "xlat", XLAT, WORD },
{ "xorb", XOR, BYTE },
{ "xorl", XOR, WORD },
{ "xorw", XOR, OWORD },
};
void gnu_parse_init(char *file)
/* Prepare parsing of an GNU assembly file. */
{
tok_init(file, '#');
}
static void zap(void)
/* An error, zap the rest of the line. */
{
token_t *t;
while ((t= get_token(0))->type != T_EOF && t->symbol != ';')
skip_token(1);
}
static mnemonic_t *search_mnem(char *name)
/* Binary search for a mnemonic. (That's why the table is sorted.) */
{
int low, mid, high;
int cmp;
mnemonic_t *m;
low= 0;
high= arraysize(mnemtab)-1;
while (low <= high) {
mid= (low + high) / 2;
m= &mnemtab[mid];
if ((cmp= strcmp(name, m->name)) == 0) return m;
if (cmp < 0) high= mid-1; else low= mid+1;
}
return nil;
}
static expression_t *gnu_get_C_expression(int *pn)
/* Read a "C-like" expression. Note that we don't worry about precedence,
* the expression is printed later like it is read. If the target language
* does not have all the operators (like ~) then this has to be repaired by
* changing the source file. (No problem, you still have one source file
* to maintain, not two.)
*/
{
expression_t *e, *a1, *a2;
token_t *t;
if ((t= get_token(*pn))->symbol == '(') {
/* ( expr ): grouping. */
(*pn)++;
if ((a1= gnu_get_C_expression(pn)) == nil) return nil;
if (get_token(*pn)->symbol != ')') {
parse_err(1, t, "missing )\n");
del_expr(a1);
return nil;
}
(*pn)++;
e= new_expr();
e->operator= '[';
e->middle= a1;
} else
if (t->type == T_WORD || t->type == T_STRING) {
/* Label, number, or string. */
e= new_expr();
e->operator= t->type == T_WORD ? 'W' : 'S';
e->name= allocate(nil, (t->len+1) * sizeof(e->name[0]));
memcpy(e->name, t->name , t->len+1);
e->len= t->len;
(*pn)++;
} else
if (t->symbol == '+' || t->symbol == '-' || t->symbol == '~') {
/* Unary operator. */
(*pn)++;
if ((a1= gnu_get_C_expression(pn)) == nil) return nil;
e= new_expr();
e->operator= t->symbol;
e->middle= a1;
} else {
parse_err(1, t, "expression syntax error\n");
return nil;
}
switch ((t= get_token(*pn))->symbol) {
case '%':
case '+':
case '-':
case '*':
case '/':
case '&':
case '|':
case '^':
case S_LEFTSHIFT:
case S_RIGHTSHIFT:
(*pn)++;
a1= e;
if ((a2= gnu_get_C_expression(pn)) == nil) {
del_expr(a1);
return nil;
}
e= new_expr();
e->operator= t->symbol;
e->left= a1;
e->right= a2;
}
return e;
}
static expression_t *gnu_get_operand(int *pn, int deref)
/* Get something like: $immed, memory, offset(%base,%index,scale), or simpler. */
{
expression_t *e, *offset, *base, *index;
token_t *t;
int c;
if (get_token(*pn)->symbol == '$') {
/* An immediate value. */
(*pn)++;
return gnu_get_C_expression(pn);
}
if (get_token(*pn)->symbol == '*') {
/* Indirection. */
(*pn)++;
if ((offset= gnu_get_operand(pn, deref)) == nil) return nil;
e= new_expr();
e->operator= '(';
e->middle= offset;
return e;
}
if ((get_token(*pn)->symbol == '%')
&& (t= get_token(*pn + 1))->type == T_WORD
&& isregister(t->name)
) {
/* A register operand. */
(*pn)+= 2;
e= new_expr();
e->operator= 'W';
e->name= copystr(t->name);
return e;
}
/* Offset? */
if (get_token(*pn)->symbol != '('
|| get_token(*pn + 1)->symbol != '%') {
/* There is an offset. */
if ((offset= gnu_get_C_expression(pn)) == nil) return nil;
} else {
/* No offset. */
offset= nil;
}
/* (%base,%index,scale) ? */
base= index= nil;
if (get_token(*pn)->symbol == '(') {
(*pn)++;
/* %base ? */
if (get_token(*pn)->symbol == '%'
&& (t= get_token(*pn + 1))->type == T_WORD
&& isregister(t->name)
) {
/* A base register expression. */
base= new_expr();
base->operator= 'B';
base->name= copystr(t->name);
(*pn)+= 2;
}
if (get_token(*pn)->symbol == ',') (*pn)++;
/* %index ? */
if (get_token(*pn)->symbol == '%'
&& (t= get_token(*pn + 1))->type == T_WORD
&& isregister(t->name)
) {
/* A index register expression. */
index= new_expr();
index->operator= '1'; /* for now */
index->name= copystr(t->name);
(*pn)+= 2;
}
if (get_token(*pn)->symbol == ',') (*pn)++;
/* scale ? */
if ((base != nil || index != nil)
&& (t= get_token(*pn))->type == T_WORD
&& strchr("1248", t->name[0]) != nil
&& t->name[1] == 0
) {
if (index == nil) {
/* Base is really an index register. */
index= base;
base= nil;
}
index->operator= t->name[0];
(*pn)++;
}
if (get_token(*pn)->symbol == ')') {
/* Ending paren. */
(*pn)++;
} else {
/* Alas. */
parse_err(1, t, "operand syntax error\n");
del_expr(offset);
del_expr(base);
del_expr(index);
return nil;
}
}
if (base == nil && index == nil) {
if (deref) {
/* Return a lone offset as (offset). */
e= new_expr();
e->operator= '(';
e->middle= offset;
} else {
/* Return a lone offset as is. */
e= offset;
}
} else {
e= new_expr();
e->operator= 'O';
e->left= offset;
e->middle= base;
e->right= index;
}
return e;
}
static expression_t *gnu_get_oplist(int *pn, int deref)
/* Get a comma (or colon for jmpf and callf) separated list of instruction
* operands.
*/
{
expression_t *e, *o1, *o2;
token_t *t;
if ((e= gnu_get_operand(pn, deref)) == nil) return nil;
if ((t= get_token(*pn))->symbol == ',' || t->symbol == ':') {
o1= e;
(*pn)++;
if ((o2= gnu_get_oplist(pn, deref)) == nil) {
del_expr(o1);
return nil;
}
e= new_expr();
e->operator= ',';
e->left= o1;
e->right= o2;
}
return e;
}
static asm86_t *gnu_get_statement(void)
/* Get a pseudo op or machine instruction with arguments. */
{
token_t *t= get_token(0);
asm86_t *a;
mnemonic_t *m;
int n;
int prefix_seen;
int deref;
assert(t->type == T_WORD);
a= new_asm86();
/* Process instruction prefixes. */
for (prefix_seen= 0;; prefix_seen= 1) {
if (strcmp(t->name, "rep") == 0
|| strcmp(t->name, "repe") == 0
|| strcmp(t->name, "repne") == 0
|| strcmp(t->name, "repz") == 0
|| strcmp(t->name, "repnz") == 0
) {
if (a->rep != ONCE) {
parse_err(1, t,
"can't have more than one rep\n");
}
switch (t->name[3]) {
case 0: a->rep= REP; break;
case 'e':
case 'z': a->rep= REPE; break;
case 'n': a->rep= REPNE; break;
}
} else
if (!prefix_seen) {
/* No prefix here, get out! */
break;
} else {
/* No more prefixes, next must be an instruction. */
if (t->type != T_WORD
|| (m= search_mnem(t->name)) == nil
|| m->optype == PSEUDO
) {
parse_err(1, t,
"machine instruction expected after instruction prefix\n");
del_asm86(a);
return nil;
}
break;
}
/* Skip the prefix and extra newlines. */
do {
skip_token(1);
} while ((t= get_token(0))->symbol == ';');
}
/* All the readahead being done upsets the line counter. */
a->line= t->line;
/* Read a machine instruction or pseudo op. */
if ((m= search_mnem(t->name)) == nil) {
parse_err(1, t, "unknown instruction '%s'\n", t->name);
del_asm86(a);
return nil;
}
a->opcode= m->opcode;
a->optype= m->optype;
a->oaz= 0;
if (a->optype == OWORD) {
a->oaz|= OPZ;
a->optype= WORD;
}
switch (a->opcode) {
case IN:
case OUT:
case INT:
deref= 0;
break;
default:
deref= (a->optype >= BYTE);
}
n= 1;
if (get_token(1)->symbol != ';'
&& (a->args= gnu_get_oplist(&n, deref)) == nil) {
del_asm86(a);
return nil;
}
if (get_token(n)->symbol != ';') {
parse_err(1, t, "garbage at end of instruction\n");
del_asm86(a);
return nil;
}
if (!is_pseudo(a->opcode)) {
/* GNU operand order is the other way around. */
expression_t *e, *t;
e= a->args;
while (e != nil && e->operator == ',') {
t= e->right; e->right= e->left; e->left= t;
e= e->left;
}
}
switch (a->opcode) {
case DOT_ALIGN:
/* Delete two argument .align, because ACK can't do it.
* Raise 2 to the power of .align's argument.
*/
if (a->args == nil || a->args->operator != 'W') {
del_asm86(a);
return nil;
}
if (a->args != nil && a->args->operator == 'W'
&& isanumber(a->args->name)
) {
unsigned n;
char num[sizeof(int) * CHAR_BIT / 3 + 1];
n= 1 << strtoul(a->args->name, nil, 0);
sprintf(num, "%u", n);
deallocate(a->args->name);
a->args->name= copystr(num);
}
break;
case JMPF:
case CALLF:
/*FALL THROUGH*/
case JMP:
case CALL:
break;
default:;
}
skip_token(n+1);
return a;
}
asm86_t *gnu_get_instruction(void)
{
asm86_t *a= nil;
expression_t *e;
token_t *t;
while ((t= get_token(0))->symbol == ';' || t->symbol == '/') {
zap(); /* if a comment started by a '/' */
skip_token(1);
}
if (t->type == T_EOF) return nil;
if (t->symbol == '#') {
/* Preprocessor line and file change. */
if ((t= get_token(1))->type != T_WORD || !isanumber(t->name)
|| get_token(2)->type != T_STRING
) {
parse_err(1, t, "file not preprocessed?\n");
zap();
} else {
set_file(get_token(2)->name,
strtol(get_token(1)->name, nil, 0) - 1);
/* GNU CPP adds extra cruft, simply zap the line. */
zap();
}
a= gnu_get_instruction();
} else
if (t->type == T_WORD && get_token(1)->symbol == ':') {
/* A label definition. */
a= new_asm86();
a->line= t->line;
a->opcode= DOT_LABEL;
a->optype= PSEUDO;
a->args= e= new_expr();
e->operator= ':';
e->name= copystr(t->name);
skip_token(2);
} else
if (t->type == T_WORD && get_token(1)->symbol == '=') {
int n= 2;
if ((e= gnu_get_C_expression(&n)) == nil) {
zap();
a= gnu_get_instruction();
} else
if (get_token(n)->symbol != ';') {
parse_err(1, t, "garbage after assignment\n");
zap();
a= gnu_get_instruction();
} else {
a= new_asm86();
a->line= t->line;
a->opcode= DOT_EQU;
a->optype= PSEUDO;
a->args= new_expr();
a->args->operator= '=';
a->args->name= copystr(t->name);
a->args->middle= e;
skip_token(n+1);
}
} else
if (t->type == T_WORD) {
if ((a= gnu_get_statement()) == nil) {
zap();
a= gnu_get_instruction();
}
} else {
parse_err(1, t, "syntax error\n");
zap();
a= gnu_get_instruction();
}
return a;
}
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