NASM 0.91nasm-0.91

5 files changed, 872 insertions, 0 deletions

diff --git a/lcc/Readme b/lcc/Readme
new file mode 100644
index 00000000..d37f812b
--- /dev/null
+++ b/lcc/Readme
@@ -0,0 +1,57 @@
+This directory contains the necessary files to port the C compiler
+``LCC'' (available by FTP from sunsite.doc.ic.ac.uk in the directory
+/computing/programming/languages/c/lcc) to compile for Linux (a.out
+or ELF) by using NASM as a back-end code generator.
+
+This patch has been tested on lcc version 3.6.
+
+To install:
+
+- Copy `x86nasm.md' into the `src' directory of the lcc tree.
+
+- Copy either `lin-elf.c' or `lin-aout.c' into the `etc' directory.
+
+- If you're installing for a.out, edit `x86nasm.md' and change the
+  conditional after the comment reading "CHANGE THIS FOR a.out" in
+  the `defsymbol' function from `#if 0' to `#if 1'.
+
+- Make the following changes to `bind.c' in the `src' directory:
+
+  - Near the top of the file, add a line that reads
+	extern Interface x86nasmIR;
+
+  - In the `bindings' array, add the lines
+        "x86-nasm",      &x86nasmIR,
+        "x86/nasm",      &x86nasmIR,
+    (in sensible looking places...)
+
+  A sample `bind.c' has been provided to show what the result of
+  this might look like. You might be able to get away with using it
+  directly...
+
+- Modify the lcc makefile to include rules for x86nasm.o: this will
+  have to be done in about three places. Just copy any line with
+  `x86' on it and modify it to read `x86nasm' everywhere. (Except
+  that in the list of object files that rcc is made up from, do
+  remember to ensure that every line but the last has a trailing
+  backslash...)
+
+- You may have to modify the contents of `lin-elf.c' or `lin-aout.c'
+  to reflect the true locations of files such as crt0.o, crt1.o,
+  ld-linux.so and so forth. If you don't know where to find these,
+  compile a short C program with `gcc -v' and see what command line
+  gcc feeds to `ld'.
+
+- You should now be able to build lcc, using `lin-elf.c' or
+  `lin-aout.c' as the system-dependent part of the `lcc' wrapper
+  program.
+
+- Symlink x86nasm.c into the `src' directory before attempting the
+  triple test, or the compile will fail.
+
+- Now it should pass the triple test, on either ELF or a.out. Voila!
+
+Known potential problems:
+
+- The machine description may occasionally generate `db' lines that
+  are longer than NASM's 1024-character maximum.
diff --git a/lcc/bind.c b/lcc/bind.c
new file mode 100644
index 00000000..b0c1f51f
--- /dev/null
+++ b/lcc/bind.c
@@ -0,0 +1,23 @@
+#include "c.h"
+extern Interface nullIR,   symbolicIR;
+extern Interface mipsebIR, mipselIR;
+extern Interface sparcIR,  solarisIR;
+extern Interface x86IR,    x86nasmIR;
+Binding bindings[] = {
+	"symbolic",      &symbolicIR,
+	"mips-irix",     &mipsebIR,
+	"mips-ultrix",   &mipselIR,
+	"sparc-sun",     &sparcIR,
+	"sparc-solaris", &solarisIR,
+	"x86-dos",       &x86IR,
+	"x86-nasm",      &x86nasmIR,
+	"symbolic/irix", &symbolicIR,		/* omit */
+	"mips/irix",     &mipsebIR,		/* omit */
+	"mips/ultrix",   &mipselIR,		/* omit */
+	"sparc/sun",     &sparcIR,		/* omit */
+	"sparc/solaris", &solarisIR,		/* omit */
+	"x86/dos",       &x86IR,		/* omit */
+	"x86/nasm",      &x86nasmIR,		/* omit */
+	"null",          &nullIR,
+	NULL,            NULL
+};
diff --git a/lcc/lin-aout.c b/lcc/lin-aout.c
new file mode 100644
index 00000000..f1ac88ad
--- /dev/null
+++ b/lcc/lin-aout.c
@@ -0,0 +1,44 @@
+/* x86 running linux and using nasm as a.out */
+
+#include <string.h>
+
+#ifndef LCCDIR
+#define LCCDIR "/usr/local/lib/lcc/"
+#endif
+
+#define NASMPATH "/usr/local/bin/nasm"
+
+char *cpp[] = { LCCDIR "cpp", "-D__STDC__=1",
+	"-Di386", "-D__i386", "-D__i386__",
+	"-Dlinux", "-D__linux", "-D__linux__",
+	"-Dunix", "-D__unix", "-D__unix__",
+	"$1", "$2", "$3", 0 };
+char *include[] = { "-I" LCCDIR "include", "-I/usr/local/include",
+	"-I/usr/include", 0 };
+char *com[] = { LCCDIR "rcc", "-target=x86/nasm",
+	"$1", "$2", "$3", 0 };
+char *as[] = { NASMPATH, "-faout", "-o", "$3", "$1", "$2", 0 };
+char *ld[] = { "/usr/bin/ld", "-m", "i386linux",
+	"-L/usr/i486-linuxaout/lib",
+	"-o", "$3", "$1",
+	"/usr/i486-linuxaout/lib/crt0.o",
+	"$2", "", "-lc", 0 };
+static char *bbexit = LCCDIR "bbexit.o";
+
+extern char *concat(char *, char *);
+extern int access(const char *, int);
+
+int option(char *arg) {
+	if (strncmp(arg, "-lccdir=", 8) == 0) {
+		cpp[0] = concat(&arg[8], "/cpp");
+		include[0] = concat("-I", concat(&arg[8], "/include"));
+		com[0] = concat(&arg[8], "/rcc");
+		bbexit = concat(&arg[8], "/bbexit.o");
+	} else if (strcmp(arg, "-g") == 0)
+		;
+	else if (strcmp(arg, "-b") == 0 && access(bbexit, 4) == 0)
+		ld[9] = bbexit;
+	else
+		return 0;
+	return 1;
+}
diff --git a/lcc/lin-elf.c b/lcc/lin-elf.c
new file mode 100644
index 00000000..15df9e57
--- /dev/null
+++ b/lcc/lin-elf.c
@@ -0,0 +1,45 @@
+/* x86 running linux and using nasm as ELF */
+
+#include <string.h>
+
+#ifndef LCCDIR
+#define LCCDIR "/usr/local/lib/lcc/"
+#endif
+
+#define NASMPATH "/usr/local/bin/nasm"
+
+char *cpp[] = { LCCDIR "cpp", "-D__STDC__=1",
+	"-D__ELF__", "-Di386", "-D__i386", "-D__i386__",
+	"-Dlinux", "-D__linux", "-D__linux__",
+	"$1", "$2", "$3", 0 };
+char *include[] = { "-I" LCCDIR "include", "-I/usr/local/include",
+	"-I/usr/include", 0 };
+char *com[] = { LCCDIR "rcc", "-target=x86/nasm",
+	"$1", "$2", "$3", 0 };
+char *as[] = { NASMPATH, "-felf", "-o", "$3", "$1", "$2", 0 };
+char *ld[] = { "/usr/bin/ld", "-m", "elf_i386",
+	"-dynamic-linker", "/lib/ld-linux.so.1",
+	"-L/usr/i486-linux/lib",
+	"-o", "$3", "$1",
+	"/usr/lib/crt1.o", "/usr/lib/crti.o", "/usr/lib/crtbegin.o",
+	"$2", "",
+	"-lc", "", "/usr/lib/crtend.o", "/usr/lib/crtn.o", 0 };
+static char *bbexit = LCCDIR "bbexit.o";
+
+extern char *concat(char *, char *);
+extern int access(const char *, int);
+
+int option(char *arg) {
+	if (strncmp(arg, "-lccdir=", 8) == 0) {
+		cpp[0] = concat(&arg[8], "/cpp");
+		include[0] = concat("-I", concat(&arg[8], "/include"));
+		com[0] = concat(&arg[8], "/rcc");
+		bbexit = concat(&arg[8], "/bbexit.o");
+	} else if (strcmp(arg, "-g") == 0)
+		;
+	else if (strcmp(arg, "-b") == 0 && access(bbexit, 4) == 0)
+		ld[13] = bbexit;
+	else
+		return 0;
+	return 1;
+}
diff --git a/lcc/x86nasm.md b/lcc/x86nasm.md
new file mode 100644
index 00000000..d7091225
--- /dev/null
+++ b/lcc/x86nasm.md
@@ -0,0 +1,703 @@
+%{
+enum { EAX=0, ECX=1, EDX=2, EBX=3, ESI=6, EDI=7 };
+#include "c.h"
+#define NODEPTR_TYPE Node
+#define OP_LABEL(p) ((p)->op)
+#define LEFT_CHILD(p) ((p)->kids[0])
+#define RIGHT_CHILD(p) ((p)->kids[1])
+#define STATE_LABEL(p) ((p)->x.state)
+static void address     ARGS((Symbol, Symbol, int));
+static void blkfetch    ARGS((int, int, int, int));
+static void blkloop     ARGS((int, int, int, int, int, int[]));
+static void blkstore    ARGS((int, int, int, int));
+static void defaddress  ARGS((Symbol));
+static void defconst    ARGS((int, Value));
+static void defstring   ARGS((int, char *));
+static void defsymbol   ARGS((Symbol));
+static void doarg       ARGS((Node));
+static void emit2       ARGS((Node));
+static void export      ARGS((Symbol));
+static void clobber     ARGS((Node));
+static void function    ARGS((Symbol, Symbol [], Symbol [], int));
+static void global      ARGS((Symbol));
+static void import      ARGS((Symbol));
+static void local       ARGS((Symbol));
+static void progbeg     ARGS((int, char **));
+static void progend     ARGS((void));
+static void segment     ARGS((int));
+static void space       ARGS((int));
+static void target      ARGS((Node));
+static int ckstack ARGS((Node, int));
+static int memop ARGS((Node));
+static int sametree ARGS((Node, Node));
+static Symbol charreg[32], shortreg[32], intreg[32];
+static Symbol fltreg[32];
+
+static int cseg;
+
+static Symbol quo, rem;
+
+%}
+%start stmt
+%term ADDD=306 ADDF=305 ADDI=309 ADDP=311 ADDU=310
+%term ADDRFP=279
+%term ADDRGP=263
+%term ADDRLP=295
+%term ARGB=41 ARGD=34 ARGF=33 ARGI=37 ARGP=39
+%term ASGNB=57 ASGNC=51 ASGND=50 ASGNF=49 ASGNI=53 ASGNP=55 ASGNS=52
+%term BANDU=390
+%term BCOMU=406
+%term BORU=422
+%term BXORU=438
+%term CALLB=217 CALLD=210 CALLF=209 CALLI=213 CALLV=216
+%term CNSTC=19 CNSTD=18 CNSTF=17 CNSTI=21 CNSTP=23 CNSTS=20 CNSTU=22
+%term CVCI=85 CVCU=86
+%term CVDF=97 CVDI=101
+%term CVFD=114
+%term CVIC=131 CVID=130 CVIS=132 CVIU=134
+%term CVPU=150
+%term CVSI=165 CVSU=166
+%term CVUC=179 CVUI=181 CVUP=183 CVUS=180
+%term DIVD=450 DIVF=449 DIVI=453 DIVU=454
+%term EQD=482 EQF=481 EQI=485
+%term GED=498 GEF=497 GEI=501 GEU=502
+%term GTD=514 GTF=513 GTI=517 GTU=518
+%term INDIRB=73 INDIRC=67 INDIRD=66 INDIRF=65 INDIRI=69 INDIRP=71 INDIRS=68
+%term JUMPV=584
+%term LABELV=600
+%term LED=530 LEF=529 LEI=533 LEU=534
+%term LOADB=233 LOADC=227 LOADD=226 LOADF=225 LOADI=229 LOADP=231 LOADS=228 LOADU=230
+%term LSHI=341 LSHU=342
+%term LTD=546 LTF=545 LTI=549 LTU=550
+%term MODI=357 MODU=358
+%term MULD=466 MULF=465 MULI=469 MULU=470
+%term NED=562 NEF=561 NEI=565
+%term NEGD=194 NEGF=193 NEGI=197
+%term RETD=242 RETF=241 RETI=245
+%term RSHI=373 RSHU=374
+%term SUBD=322 SUBF=321 SUBI=325 SUBP=327 SUBU=326
+%term VREGP=615
+%%
+reg:  INDIRC(VREGP)     "# read register\n"
+reg:  INDIRD(VREGP)     "# read register\n"
+reg:  INDIRF(VREGP)     "# read register\n"
+reg:  INDIRI(VREGP)     "# read register\n"
+reg:  INDIRP(VREGP)     "# read register\n"
+reg:  INDIRS(VREGP)     "# read register\n"
+stmt: ASGNC(VREGP,reg)  "# write register\n"
+stmt: ASGND(VREGP,reg)  "# write register\n"
+stmt: ASGNF(VREGP,reg)  "# write register\n"
+stmt: ASGNI(VREGP,reg)  "# write register\n"
+stmt: ASGNP(VREGP,reg)  "# write register\n"
+stmt: ASGNS(VREGP,reg)  "# write register\n"
+con: CNSTC  "%a"
+con: CNSTI  "%a"
+con: CNSTP  "%a"
+con: CNSTS  "%a"
+con: CNSTU  "%a"
+stmt: reg  ""
+reg: CVIU(reg)  "%0"  notarget(a)
+reg: CVPU(reg)  "%0"  notarget(a)
+reg: CVUI(reg)  "%0"  notarget(a)
+reg: CVUP(reg)  "%0"  notarget(a)
+acon: ADDRGP  "%a"
+acon: con     "%0"
+base: ADDRGP          "%a"
+base: reg             "%0"
+base: ADDI(reg,acon)  "%0 + (%1)"
+base: ADDP(reg,acon)  "%0 + (%1)"
+base: ADDU(reg,acon)  "%0 + (%1)"
+base: ADDRFP  "ebp + %a"
+base: ADDRLP  "ebp + %a"
+index: reg "%0"
+index: LSHI(reg,con1)  "%0*2"
+index: LSHI(reg,con2)  "%0*4"
+index: LSHI(reg,con3)  "%0*8"
+
+con1:  CNSTI  "1"  range(a, 1, 1)
+con1:  CNSTU  "1"  range(a, 1, 1)
+con2:  CNSTI  "2"  range(a, 2, 2)
+con2:  CNSTU  "2"  range(a, 2, 2)
+con3:  CNSTI  "3"  range(a, 3, 3)
+con3:  CNSTU  "3"  range(a, 3, 3)
+index: LSHU(reg,con1)  "%0*2"
+index: LSHU(reg,con2)  "%0*4"
+index: LSHU(reg,con3)  "%0*8"
+addr: base              "[%0]"
+addr: ADDI(index,base)  "[%1 + %0]"
+addr: ADDP(index,base)  "[%1 + %0]"
+addr: ADDU(index,base)  "[%1 + %0]"
+addr: index  "[%0]"
+mem: INDIRC(addr)  "byte %0"
+mem: INDIRI(addr)  "dword %0"
+mem: INDIRP(addr)  "dword %0"
+mem: INDIRS(addr)  "word %0"
+rc:   reg  "%0"
+rc:   con  "%0"
+
+mr:   reg  "%0"
+mr:   mem  "%0"
+
+mrc0: mem  "%0"
+mrc0: rc   "%0"
+mrc1: mem  "%0"  1
+mrc1: rc   "%0"
+
+mrc3: mem  "%0"  3
+mrc3: rc   "%0"
+reg: addr        "lea %c,%0\n"  1
+reg: mrc0        "mov %c,%0\n"  1
+reg: LOADC(reg)  "mov %c,%0\n"  move(a)
+reg: LOADI(reg)  "mov %c,%0\n"  move(a)
+reg: LOADP(reg)  "mov %c,%0\n"  move(a)
+reg: LOADS(reg)  "mov %c,%0\n"  move(a)
+reg: LOADU(reg)  "mov %c,%0\n"  move(a)
+reg: ADDI(reg,mrc1)  "?mov %c,%0\nadd %c,%1\n"  1
+reg: ADDP(reg,mrc1)  "?mov %c,%0\nadd %c,%1\n"  1
+reg: ADDU(reg,mrc1)  "?mov %c,%0\nadd %c,%1\n"  1
+reg: SUBI(reg,mrc1)  "?mov %c,%0\nsub %c,%1\n"  1
+reg: SUBP(reg,mrc1)  "?mov %c,%0\nsub %c,%1\n"  1
+reg: SUBU(reg,mrc1)  "?mov %c,%0\nsub %c,%1\n"  1
+reg: BANDU(reg,mrc1)  "?mov %c,%0\nand %c,%1\n"  1
+reg: BORU(reg,mrc1)   "?mov %c,%0\nor %c,%1\n"   1
+reg: BXORU(reg,mrc1)  "?mov %c,%0\nxor %c,%1\n"  1
+stmt: ASGNI(addr,ADDI(mem,con1))  "inc %1\n"  memop(a)
+stmt: ASGNI(addr,ADDU(mem,con1))  "inc %1\n"  memop(a)
+stmt: ASGNP(addr,ADDP(mem,con1))  "inc %1\n"  memop(a)
+stmt: ASGNI(addr,SUBI(mem,con1))  "dec %1\n"  memop(a)
+stmt: ASGNI(addr,SUBU(mem,con1))  "dec %1\n"  memop(a)
+stmt: ASGNP(addr,SUBP(mem,con1))  "dec %1\n"  memop(a)
+stmt: ASGNI(addr,ADDI(mem,rc))   "add %1,%2\n"  memop(a)
+stmt: ASGNI(addr,ADDU(mem,rc))   "add %1,%2\n"  memop(a)
+stmt: ASGNI(addr,SUBI(mem,rc))   "sub %1,%2\n"  memop(a)
+stmt: ASGNI(addr,SUBU(mem,rc))   "sub %1,%2\n"  memop(a)
+
+stmt: ASGNI(addr,BANDU(mem,rc))  "and %1,%2\n"  memop(a)
+stmt: ASGNI(addr,BORU(mem,rc))   "or %1,%2\n"   memop(a)
+stmt: ASGNI(addr,BXORU(mem,rc))  "xor %1,%2\n"  memop(a)
+reg: BCOMU(reg)  "?mov %c,%0\nnot %c\n"  2
+reg: NEGI(reg)   "?mov %c,%0\nneg %c\n"  2
+
+stmt: ASGNI(addr,BCOMU(mem))  "not %1\n"  memop(a)
+stmt: ASGNI(addr,NEGI(mem))   "neg %1\n"  memop(a)
+reg: LSHI(reg,rc5)  "?mov %c,%0\nsal %c,%1\n"  2
+reg: LSHU(reg,rc5)  "?mov %c,%0\nshl %c,%1\n"  2
+reg: RSHI(reg,rc5)  "?mov %c,%0\nsar %c,%1\n"  2
+reg: RSHU(reg,rc5)  "?mov %c,%0\nshr %c,%1\n"  2
+
+stmt: ASGNI(addr,LSHI(mem,rc5))  "sal %1,%2\n"  memop(a)
+stmt: ASGNI(addr,LSHU(mem,rc5))  "shl %1,%2\n"  memop(a)
+stmt: ASGNI(addr,RSHI(mem,rc5))  "sar %1,%2\n"  memop(a)
+stmt: ASGNI(addr,RSHU(mem,rc5))  "shr %1,%2\n"  memop(a)
+
+rc5: CNSTI  "%a"  range(a, 0, 31)
+rc5: reg    "cl"
+reg: MULI(reg,mrc3)  "?mov %c,%0\nimul %c,%1\n"  14
+reg: MULI(con,mr)    "imul %c,%1,%0\n"  13
+reg: MULU(reg,mr)  "mul %1\n"  13
+reg: DIVU(reg,reg)  "xor edx,edx\ndiv %1\n"
+reg: MODU(reg,reg)  "xor edx,edx\ndiv %1\n"
+reg: DIVI(reg,reg)  "cdq\nidiv %1\n"
+reg: MODI(reg,reg)  "cdq\nidiv %1\n"
+reg: CVIU(reg)  "mov %c,%0\n"  move(a)
+reg: CVPU(reg)  "mov %c,%0\n"  move(a)
+reg: CVUI(reg)  "mov %c,%0\n"  move(a)
+reg: CVUP(reg)  "mov %c,%0\n"  move(a)
+reg: CVCI(INDIRC(addr))  "movsx %c,byte %0\n"  3
+reg: CVCU(INDIRC(addr))  "movzx %c,byte %0\n"  3
+reg: CVSI(INDIRS(addr))  "movsx %c,word %0\n"  3
+reg: CVSU(INDIRS(addr))  "movzx %c,word %0\n"  3
+reg: CVCI(reg)  "# extend\n"  3
+reg: CVCU(reg)  "# extend\n"  3
+reg: CVSI(reg)  "# extend\n"  3
+reg: CVSU(reg)  "# extend\n"  3
+
+reg: CVIC(reg)  "# truncate\n"  1
+reg: CVIS(reg)  "# truncate\n"  1
+reg: CVUC(reg)  "# truncate\n"  1
+reg: CVUS(reg)  "# truncate\n"  1
+stmt: ASGNC(addr,rc)  "mov byte %0,%1\n"   1
+stmt: ASGNI(addr,rc)  "mov dword %0,%1\n"  1
+stmt: ASGNP(addr,rc)  "mov dword %0,%1\n"  1
+stmt: ASGNS(addr,rc)  "mov word %0,%1\n"   1
+stmt: ARGI(mrc3)  "push dword %0\n"  1
+stmt: ARGP(mrc3)  "push dword %0\n"  1
+stmt: ASGNB(reg,INDIRB(reg))  "mov ecx,%a\nrep movsb\n"
+stmt: ARGB(INDIRB(reg))  "sub esp,%a\nmov edi,esp\nmov ecx,%a\nrep movsb\n"
+
+memf: INDIRD(addr)        "qword %0"
+memf: INDIRF(addr)        "dword %0"
+memf: CVFD(INDIRF(addr))  "dword %0"
+reg: memf  "fld %0\n"  3
+stmt: ASGND(addr,reg)        "fstp qword %0\n"  7
+stmt: ASGNF(addr,reg)        "fstp dword %0\n"  7
+stmt: ASGNF(addr,CVDF(reg))  "fstp dword %0\n"  7
+stmt: ARGD(reg)  "sub esp,8\nfstp qword [esp]\n"
+stmt: ARGF(reg)  "sub esp,4\nfstp dword [esp]\n"
+reg: NEGD(reg)  "fchs\n"
+reg: NEGF(reg)  "fchs\n"
+reg: ADDD(reg,memf)  "fadd %1\n"
+reg: ADDD(reg,reg)  "faddp st1\n"
+reg: ADDF(reg,memf)  "fadd %1\n"
+reg: ADDF(reg,reg)  "faddp st1\n"
+reg: DIVD(reg,memf)  "fdiv %1\n"
+reg: DIVD(reg,reg)  "fdivrp st1\n"
+reg: DIVF(reg,memf)  "fdiv %1\n"
+reg: DIVF(reg,reg)  "fdivrp st1\n"
+reg: MULD(reg,memf)  "fmul %1\n"
+reg: MULD(reg,reg)  "fmulp st1\n"
+reg: MULF(reg,memf)  "fmul %1\n"
+reg: MULF(reg,reg)  "fmulp st1\n"
+reg: SUBD(reg,memf)  "fsub %1\n"
+reg: SUBD(reg,reg)  "fsubrp st1\n"
+reg: SUBF(reg,memf)  "fsub %1\n"
+reg: SUBF(reg,reg)  "fsubrp st1\n"
+reg: CVFD(reg)  "# CVFD\n"
+reg: CVDF(reg)  "sub esp,4\nfstp dword [esp]\nfld dword [esp]\nadd esp,4\n"  12
+
+stmt: ASGNI(addr,CVDI(reg))  "fistp dword %0\n"  29
+reg: CVDI(reg)  "sub esp,4\nfistp dword [esp]\npop %c\n" 31
+
+reg: CVID(INDIRI(addr))  "fild dword %0\n"  10
+reg: CVID(reg)  "push %0\nfild dword [esp]\nadd esp,4\n"  12
+
+addrj: ADDRGP  "%a"
+addrj: reg     "%0"  2
+addrj: mem     "%0"  2
+
+stmt:  JUMPV(addrj)  "jmp %0\n"  3
+stmt:  LABELV        "%a:\n"
+stmt: EQI(mem,rc)  "cmp %0,%1\nje near %a\n"   5
+stmt: GEI(mem,rc)  "cmp %0,%1\njge near %a\n"  5
+stmt: GTI(mem,rc)  "cmp %0,%1\njg near %a\n"   5
+stmt: LEI(mem,rc)  "cmp %0,%1\njle near %a\n"  5
+stmt: LTI(mem,rc)  "cmp %0,%1\njl near %a\n"   5
+stmt: NEI(mem,rc)  "cmp %0,%1\njne near %a\n"  5
+stmt: GEU(mem,rc)  "cmp %0,%1\njae near %a\n"  5
+stmt: GTU(mem,rc)  "cmp %0,%1\nja  near %a\n"  5
+stmt: LEU(mem,rc)  "cmp %0,%1\njbe near %a\n"  5
+stmt: LTU(mem,rc)  "cmp %0,%1\njb  near %a\n"  5
+stmt: EQI(reg,mrc1)  "cmp %0,%1\nje near %a\n"   4
+stmt: GEI(reg,mrc1)  "cmp %0,%1\njge near %a\n"  4
+stmt: GTI(reg,mrc1)  "cmp %0,%1\njg near %a\n"   4
+stmt: LEI(reg,mrc1)  "cmp %0,%1\njle near %a\n"  4
+stmt: LTI(reg,mrc1)  "cmp %0,%1\njl near %a\n"   4
+stmt: NEI(reg,mrc1)  "cmp %0,%1\njne near %a\n"  4
+
+stmt: GEU(reg,mrc1)  "cmp %0,%1\njae near %a\n"  4
+stmt: GTU(reg,mrc1)  "cmp %0,%1\nja near %a\n"   4
+stmt: LEU(reg,mrc1)  "cmp %0,%1\njbe near %a\n"  4
+stmt: LTU(reg,mrc1)  "cmp %0,%1\njb near %a\n"   4
+cmpf: memf  " %0"
+cmpf: reg   "p"
+stmt: EQD(cmpf,reg)  "fcomp%0\nfstsw ax\nsahf\nje near %a\n"
+stmt: GED(cmpf,reg)  "fcomp%0\nfstsw ax\nsahf\njbe near %a\n"
+stmt: GTD(cmpf,reg)  "fcomp%0\nfstsw ax\nsahf\njb near %a\n"
+stmt: LED(cmpf,reg)  "fcomp%0\nfstsw ax\nsahf\njae near %a\n"
+stmt: LTD(cmpf,reg)  "fcomp%0\nfstsw ax\nsahf\nja near %a\n"
+stmt: NED(cmpf,reg)  "fcomp%0\nfstsw ax\nsahf\njne near %a\n"
+
+stmt: EQF(cmpf,reg)  "fcomp%0\nfstsw ax\nsahf\nje near %a\n"
+stmt: GEF(cmpf,reg)  "fcomp%0\nfstsw ax\nsahf\njbe near %a\n"
+stmt: GTF(cmpf,reg)  "fcomp%0\nfstsw ax\nsahf\njb near %a\n"
+stmt: LEF(cmpf,reg)  "fcomp%0\nfstsw ax\nsahf\njae near %a\n"
+stmt: LTF(cmpf,reg)  "fcomp%0\nfstsw ax\nsahf\nja near %a\n"
+stmt: NEF(cmpf,reg)  "fcomp%0\nfstsw ax\nsahf\njne near %a\n"
+reg:  CALLI(addrj)  "call %0\nadd esp,%a\n"
+stmt: CALLV(addrj)  "call %0\nadd esp,%a\n"
+reg: CALLF(addrj)  "call %0\nadd esp,%a\n"
+reg: CALLD(addrj)  "call %0\nadd esp,%a\n"
+
+stmt: RETI(reg)  "# ret\n"
+stmt: RETF(reg)  "# ret\n"
+stmt: RETD(reg)  "# ret\n"
+%%
+static void progbeg(argc, argv) int argc; char *argv[]; {
+	int i;
+
+	{
+		union {
+			char c;
+			int i;
+		} u;
+		u.i = 0;
+		u.c = 1;
+		swap = (u.i == 1) != IR->little_endian;
+	}
+	parseflags(argc, argv);
+	intreg[EAX] = mkreg("eax", EAX, 1, IREG);
+	intreg[EDX] = mkreg("edx", EDX, 1, IREG);
+	intreg[ECX] = mkreg("ecx", ECX, 1, IREG);
+	intreg[EBX] = mkreg("ebx", EBX, 1, IREG);
+	intreg[ESI] = mkreg("esi", ESI, 1, IREG);
+	intreg[EDI] = mkreg("edi", EDI, 1, IREG);
+	shortreg[EAX] = mkreg("ax", EAX, 1, IREG);
+	shortreg[ECX] = mkreg("cx", ECX, 1, IREG);
+	shortreg[EDX] = mkreg("dx", EDX, 1, IREG);
+	shortreg[EBX] = mkreg("bx", EBX, 1, IREG);
+	shortreg[ESI] = mkreg("si", ESI, 1, IREG);
+	shortreg[EDI] = mkreg("di", EDI, 1, IREG);
+
+	charreg[EAX]  = mkreg("al", EAX, 1, IREG);
+	charreg[ECX]  = mkreg("cl", ECX, 1, IREG);
+	charreg[EDX]  = mkreg("dl", EDX, 1, IREG);
+	charreg[EBX]  = mkreg("bl", EBX, 1, IREG);
+	for (i = 0; i < 8; i++)
+		fltreg[i] = mkreg("%d", i, 0, FREG);
+	rmap[C] = mkwildcard(charreg);
+	rmap[S] = mkwildcard(shortreg);
+	rmap[P] = rmap[B] = rmap[U] = rmap[I] = mkwildcard(intreg);
+	rmap[F] = rmap[D] = mkwildcard(fltreg);
+	tmask[IREG] = (1<<EDI) | (1<<ESI) | (1<<EBX)
+	            | (1<<EDX) | (1<<ECX) | (1<<EAX);
+	vmask[IREG] = 0;
+	tmask[FREG] = 0xff;
+	vmask[FREG] = 0;
+	cseg = 0;
+	quo = mkreg("eax", EAX, 1, IREG);
+	quo->x.regnode->mask |= 1<<EDX;
+	rem = mkreg("edx", EDX, 1, IREG);
+	rem->x.regnode->mask |= 1<<EAX;
+}
+static void segment(n) int n; {
+	if (n == cseg)
+		return;
+	cseg = n;
+	if (cseg == CODE)
+		print("[section .text]\n");
+	else if (cseg == DATA || cseg == LIT)
+		print("[section .data]\n");
+	else if (cseg == BSS)
+		print("[section .bss]\n");
+}
+static void progend() {
+
+}
+static void target(p) Node p; {
+	assert(p);
+	switch (p->op) {
+	case RSHI: case RSHU: case LSHI: case LSHU:
+		if (generic(p->kids[1]->op) != CNST
+		&& !(   generic(p->kids[1]->op) == INDIR
+		     && p->kids[1]->kids[0]->op == VREG+P
+		     && p->kids[1]->syms[RX]->u.t.cse
+		     && generic(p->kids[1]->syms[RX]->u.t.cse->op) == CNST
+)) {
+			rtarget(p, 1, intreg[ECX]);
+			setreg(p, intreg[EAX]);
+		}
+		break;
+	case MULU:
+		setreg(p, quo);
+		rtarget(p, 0, intreg[EAX]);
+		break;
+	case DIVI: case DIVU:
+		setreg(p, quo);
+		rtarget(p, 0, intreg[EAX]);
+		rtarget(p, 1, intreg[ECX]);
+		break;
+	case MODI: case MODU:
+		setreg(p, rem);
+		rtarget(p, 0, intreg[EAX]);
+		rtarget(p, 1, intreg[ECX]);
+		break;
+	case ASGNB:
+		rtarget(p, 0, intreg[EDI]);
+		rtarget(p->kids[1], 0, intreg[ESI]);
+		break;
+	case ARGB:
+		rtarget(p->kids[0], 0, intreg[ESI]);
+		break;
+	case CALLI: case CALLV:
+		setreg(p, intreg[EAX]);
+		break;
+	case RETI:
+		rtarget(p, 0, intreg[EAX]);
+		break;
+	}
+}
+
+static void clobber(p) Node p; {
+	static int nstack = 0;
+
+	assert(p);
+	nstack = ckstack(p, nstack);
+	assert(p->count > 0 || nstack == 0);
+	switch (p->op) {
+	case ASGNB: case ARGB:
+		spill(1<<ECX | 1<<ESI | 1<<EDI, IREG, p);
+		break;
+	case EQD: case LED: case GED: case LTD: case GTD: case NED:
+	case EQF: case LEF: case GEF: case LTF: case GTF: case NEF:
+		spill(1<<EAX, IREG, p);
+		break;
+	case CALLD: case CALLF:
+		spill(1<<EDX | 1<<EAX, IREG, p);
+		break;
+	}
+}
+#define isfp(p) (optype((p)->op)==F || optype((p)->op)==D)
+
+static int ckstack(p, n) Node p; int n; {
+	int i;
+
+	for (i = 0; i < NELEMS(p->x.kids) && p->x.kids[i]; i++)
+		if (isfp(p->x.kids[i]))
+			n--;
+	if (isfp(p) && p->count > 0)
+		n++;
+	if (n > 8)
+		error("expression too complicated\n");
+	debug(fprint(2, "(ckstack(%x)=%d)\n", p, n));
+	assert(n >= 0);
+	return n;
+}
+static int memop(p) Node p; {
+	assert(p);
+	assert(generic(p->op) == ASGN);
+	assert(p->kids[0]);
+	assert(p->kids[1]);
+	if (generic(p->kids[1]->kids[0]->op) == INDIR
+	&& sametree(p->kids[0], p->kids[1]->kids[0]->kids[0]))
+		return 3;
+	else
+		return LBURG_MAX;
+}
+static int sametree(p, q) Node p, q; {
+	return p == NULL && q == NULL
+	|| p && q && p->op == q->op && p->syms[0] == q->syms[0]
+		&& sametree(p->kids[0], q->kids[0])
+		&& sametree(p->kids[1], q->kids[1]);
+}
+static void emit2(p) Node p; {
+#define preg(f) ((f)[getregnum(p->x.kids[0])]->x.name)
+
+	if (p->op == CVCI)
+		print("movsx %s,%s\n", p->syms[RX]->x.name
+, preg(charreg));
+	else if (p->op == CVCU)
+		print("movzx %s,%s\n", p->syms[RX]->x.name
+, preg(charreg));
+	else if (p->op == CVSI)
+		print("movsx %s,%s\n", p->syms[RX]->x.name
+, preg(shortreg));
+	else if (p->op == CVSU)
+		print("movzx %s,%s\n", p->syms[RX]->x.name
+, preg(shortreg));
+	else if (p->op == CVIC || p->op == CVIS
+	      || p->op == CVUC || p->op == CVUS) {
+		char *dst = shortreg[getregnum(p)]->x.name;
+		char *src = preg(shortreg);
+		if (dst != src)
+			print("mov %s,%s\n", dst, src);
+	}
+}
+
+static void doarg(p) Node p; {
+	assert(p && p->syms[0]);
+	mkactual(4, p->syms[0]->u.c.v.i);
+}
+static void blkfetch(k, off, reg, tmp)
+int k, off, reg, tmp; {}
+static void blkstore(k, off, reg, tmp)
+int k, off, reg, tmp; {}
+static void blkloop(dreg, doff, sreg, soff, size, tmps)
+int dreg, doff, sreg, soff, size, tmps[]; {}
+static void local(p) Symbol p; {
+	if (isfloat(p->type))
+		p->sclass = AUTO;
+	if (askregvar(p, rmap[ttob(p->type)]) == 0)
+		mkauto(p);
+}
+static void function(f, caller, callee, n)
+Symbol f, callee[], caller[]; int n; {
+	int i;
+
+	print("%s:\n", f->x.name);
+	print("push ebx\n");
+	print("push esi\n");
+	print("push edi\n");
+	print("push ebp\n");
+	print("mov ebp,esp\n");
+usedmask[0] = usedmask[1] = 0;
+freemask[0] = freemask[1] = ~(unsigned)0;
+	offset = 16 + 4;
+	for (i = 0; callee[i]; i++) {
+		Symbol p = callee[i];
+		Symbol q = caller[i];
+		assert(q);
+		p->x.offset = q->x.offset = offset;
+		p->x.name = q->x.name = stringf("%d", p->x.offset);
+		p->sclass = q->sclass = AUTO;
+		offset += roundup(q->type->size, 4);
+	}
+	assert(caller[i] == 0);
+	offset = maxoffset = 0;
+	gencode(caller, callee);
+	framesize = roundup(maxoffset, 4);
+	if (framesize > 0)
+		print("sub esp,%d\n", framesize);
+	emitcode();
+	print("mov esp,ebp\n");
+	print("pop ebp\n");
+	print("pop edi\n");
+	print("pop esi\n");
+	print("pop ebx\n");
+	print("ret\n");
+}
+static void defsymbol(p) Symbol p; {
+	if (p->scope >= LOCAL && p->sclass == STATIC)
+		p->x.name = stringf("L%d", genlabel(1));
+	else if (p->generated)
+		p->x.name = stringf("$L%s", p->name);
+	else if (p->scope == GLOBAL || p->sclass == EXTERN)
+	/* CHANGE THIS FOR a.out */
+#if 0
+		p->x.name = stringf("$_%s", p->name);
+#else
+		p->x.name = stringf("$%s", p->name);
+#endif
+	else if (p->scope == CONSTANTS
+	&& (isint(p->type) || isptr(p->type))
+	&& p->name[0] == '0' && p->name[1] == 'x')
+		p->x.name = stringf("0%sH", &p->name[2]);
+	else
+		p->x.name = p->name;
+}
+static void address(q, p, n) Symbol q, p; int n; {
+	if (p->scope == GLOBAL
+	|| p->sclass == STATIC || p->sclass == EXTERN)
+		q->x.name = stringf("%s%s%d",
+			p->x.name, n >= 0 ? "+" : "", n);
+	else {
+		q->x.offset = p->x.offset + n;
+		q->x.name = stringd(q->x.offset);
+	}
+}
+static void defconst(ty, v) int ty; Value v; {
+	switch (ty) {
+		case C: print("db %d\n",   v.uc); return;
+		case S: print("dw %d\n",   v.ss); return;
+		case I: print("dd %d\n",   v.i ); return;
+		case U: print("dd 0%xH\n", v.u ); return;
+		case P: print("dd 0%xH\n", v.p ); return;
+		case F:
+			print("dd 0%xH\n", *(unsigned *)&v.f);
+			return;
+		case D: {
+			unsigned *p = (unsigned *)&v.d;
+			print("dd 0%xH,0%xH\n", p[swap], p[1 - swap]);
+			return;
+			}
+	}
+	assert(0);
+}
+static void defaddress(p) Symbol p; {
+	print("dd %s\n", p->x.name);
+}
+static void defstring(n, str) int n; char *str; {
+	char *s;
+	int inquote = 1;
+
+	print("db '");
+
+	for (s = str; s < str + n; s++)
+	{
+		if ((*s & 0x7F) == *s && *s >= ' ' && *s != '\'') {
+			if (!inquote){
+				print(", '");
+				inquote = 1;
+			}
+			print("%c",*s);
+		}
+		else
+		{
+			if (inquote){
+				print("', ");
+				inquote = 0;
+			}
+			else
+				print(", ");
+			print("%d",*s);
+		}
+	}
+	if (inquote) print("'");
+	print("\n");
+}
+static void export(p) Symbol p; {
+	print("[global %s]\n", p->x.name);
+}
+static void import(p) Symbol p; {
+	if (p->ref > 0) {
+		print("[extern %s]\n", p->x.name);
+	}
+}
+static void global(p) Symbol p; {
+	int i;
+
+	if (p->u.seg == BSS)
+		print("resb ($-$$) & %d\n",
+			p->type->align > 4 ? 3 : p->type->align-1);
+	else
+		print("times ($-$$) & %d nop\n",
+			p->type->align > 4 ? 3 : p->type->align-1);
+	print("%s:\n", p->x.name);
+	if (p->u.seg == BSS)
+		print("resb %d\n", p->type->size);
+}
+static void space(n) int n; {
+	int i;
+
+	if (cseg != BSS)
+		print("times %d db 0\n", n);
+}
+Interface x86nasmIR = {
+	1, 1, 0,  /* char */
+	2, 2, 0,  /* short */
+	4, 4, 0,  /* int */
+	4, 4, 1,  /* float */
+	8, 4, 1,  /* double */
+	4, 4, 0,  /* T * */
+	0, 4, 0,  /* struct; so that ARGB keeps stack aligned */
+	1,        /* little_endian */
+	0,        /* mulops_calls */
+	0,        /* wants_callb */
+	1,        /* wants_argb */
+	0,        /* left_to_right */
+	0,        /* wants_dag */
+	address,
+	blockbeg,
+	blockend,
+	defaddress,
+	defconst,
+	defstring,
+	defsymbol,
+	emit,
+	export,
+	function,
+	gen,
+	global,
+	import,
+	local,
+	progbeg,
+	progend,
+	segment,
+	space,
+	0, 0, 0, 0, 0, 0, 0,
+	{1, blkfetch, blkstore, blkloop,
+	    _label,
+	    _rule,
+	    _nts,
+	    _kids,
+	    _opname,
+	    _arity,
+	    _string,
+	    _templates,
+	    _isinstruction,
+	    _ntname,
+	    emit2,
+	    doarg,
+	    target,
+	    clobber,
+}
+};