avcall-m68k.c
上传用户:shenzhenrh
上传日期:2013-05-12
资源大小:2904k
文件大小:5k
- #ifndef _avcall_m68k_c /*-*- C -*-*/
- #define _avcall_m68k_c
- /**
- Copyright 1993 Bill Triggs, <Bill.Triggs@inrialpes.fr>
- Copyright 1995-1999 Bruno Haible, <haible@clisp.cons.org>
- This is free software distributed under the GNU General Public
- Licence described in the file COPYING. Contact the author if
- you don't have this or can't live with it. There is ABSOLUTELY
- NO WARRANTY, explicit or implied, on this software.
- **/
- /*----------------------------------------------------------------------
- !!! THIS ROUTINE MUST BE COMPILED gcc -O !!!
- Foreign function interface for a m68k Sun3 with gcc/sun-cc.
- This calls a C function with an argument list built up using macros
- defined in av_call.h.
- M68k Argument Passing Conventions:
- All arguments are passed on the stack with word alignment. Doubles take
- two words. Structure args are passed as true structures embedded in the
- argument stack. To return a structure, the called function copies the
- return value to the address supplied in register "a1". Gcc without
- -fpcc-struct-return returns <= 4 byte structures as integers.
- Compile this routine with gcc -O (or -O2 or -g -O) to get the right
- register variables, or use the assembler version.
- ----------------------------------------------------------------------*/
- #include "avcall.h.in"
- #define RETURN(TYPE,VAL) (*(TYPE*)l->raddr = (TYPE)(VAL))
- int
- __builtin_avcall(av_alist* l)
- {
- register __avword* sp __asm__("sp"); /* C names for registers */
- register __avword* sret __asm__("a1"); /* structure return pointer */
- /*register __avword iret __asm__("d0"); */
- register __avword iret2 __asm__("d1");
- register float fret __asm__("d0"); /* d0 */
- register double dret __asm__("d0"); /* d0,d1 */
- register float fp_fret __asm__("fp0");
- register double fp_dret __asm__("fp0");
- __avword* argframe = (sp -= __AV_ALIST_WORDS); /* make room for argument list */
- int arglen = l->aptr - l->args;
- __avword i;
- __avword i2;
- for (i = 0; i < arglen; i++) /* push function args onto stack */
- argframe[i] = l->args[i];
- if (l->rtype == __AVstruct) /* push struct return address */
- __asm__("move%.l %0,%/a1" : : "g" (l->raddr));
- i = (*l->func)(); /* call function */
- i2 = iret2;
- /* save return value */
- if (l->rtype == __AVvoid) {
- } else
- if (l->rtype == __AVword) {
- RETURN(__avword, i);
- } else
- if (l->rtype == __AVchar) {
- RETURN(char, i);
- } else
- if (l->rtype == __AVschar) {
- RETURN(signed char, i);
- } else
- if (l->rtype == __AVuchar) {
- RETURN(unsigned char, i);
- } else
- if (l->rtype == __AVshort) {
- RETURN(short, i);
- } else
- if (l->rtype == __AVushort) {
- RETURN(unsigned short, i);
- } else
- if (l->rtype == __AVint) {
- RETURN(int, i);
- } else
- if (l->rtype == __AVuint) {
- RETURN(unsigned int, i);
- } else
- if (l->rtype == __AVlong) {
- RETURN(long, i);
- } else
- if (l->rtype == __AVulong) {
- RETURN(unsigned long, i);
- } else
- if (l->rtype == __AVlonglong || l->rtype == __AVulonglong) {
- ((__avword*)l->raddr)[0] = i;
- ((__avword*)l->raddr)[1] = i2;
- } else
- if (l->rtype == __AVfloat) {
- if (l->flags & __AV_FREG_FLOAT_RETURN) {
- RETURN(float, fp_fret);
- } else {
- if (l->flags & __AV_SUNCC_FLOAT_RETURN) {
- RETURN(float, (float)dret);
- } else {
- RETURN(float, fret);
- }
- }
- } else
- if (l->rtype == __AVdouble) {
- if (l->flags & __AV_FREG_FLOAT_RETURN) {
- RETURN(double, fp_dret);
- } else {
- RETURN(double, dret);
- }
- } else
- if (l->rtype == __AVvoidp) {
- RETURN(void*, i);
- } else
- if (l->rtype == __AVstruct) {
- /* NB: On m68k, all structure sizes are divisible by 2. */
- if (l->flags & __AV_REGISTER_STRUCT_RETURN) {
- if (l->rsize == sizeof(char)) { /* can't occur */
- RETURN(char, i);
- goto done;
- } else
- if (l->rsize == sizeof(short)) {
- RETURN(short, i);
- goto done;
- } else
- if (l->rsize == sizeof(int)) {
- RETURN(int, i);
- goto done;
- } else
- if (l->rsize == 2*sizeof(__avword)) {
- ((__avword*)l->raddr)[0] = i;
- ((__avword*)l->raddr)[1] = i2;
- goto done;
- }
- }
- if (l->flags & __AV_PCC_STRUCT_RETURN) {
- /* pcc struct return convention: need a *(TYPE*)l->raddr = *(TYPE*)i; */
- if (l->rsize == sizeof(char)) { /* can't occur */
- RETURN(char, *(char*)i);
- } else
- if (l->rsize == sizeof(short)) {
- RETURN(short, *(short*)i);
- } else
- if (l->rsize == sizeof(int)) {
- RETURN(int, *(int*)i);
- } else
- if (l->rsize == sizeof(double)) {
- ((int*)l->raddr)[0] = ((int*)i)[0];
- ((int*)l->raddr)[1] = ((int*)i)[1];
- } else {
- int n = (l->rsize + sizeof(__avword)-1)/sizeof(__avword);
- while (--n >= 0)
- ((__avword*)l->raddr)[n] = ((__avword*)i)[n];
- }
- } else {
- /* normal struct return convention */
- }
- done: ;
- }
- sp += __AV_ALIST_WORDS;
- return 0;
- }
- #endif /*_avcall_m68k_c */