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- #ifndef _avcall_m68k_c /*-*- C -*-*/
- #define _avcall_m68k_c "$Id: avcall-m68k.c,v 1.1.1.1 1995/09/10 10:58:52 marcus Exp $"
- /**
- Copyright 1993 Bill Triggs, <bill@robots.oxford.ac.uk>,
- Oxford University Robotics Group, Oxford OX1 3PJ, U.K.
-
- Copyright 1995 Bruno Haible, <haible@ma2s2.mathematik.uni-karlsruhe.de>
-
- 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"
-
- #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 */
-
- __avword* argframe = (sp -= __AV_ALIST_WORDS); /* make room for argument list */
- int arglen = l->aptr - l->args;
- __avword i;
-
- for (i = 0; i < arglen; i++) /* push function args onto stack */
- argframe[i] = l->args[i];
-
- if (l->rtype == __AVstruct) /* push struct return address */
- #if 0
- __asm__("movel %0,a1" : : "g" (l->raddr));
- #else
- sret = l->raddr;
- #endif
- i = (*l->func)(); /* call function */
-
- switch (l->rtype) /* save return value */
- {
- case __AVvoid: break;
- case __AVword: RETURN(__avword, i); break;
- case __AVchar: RETURN(char, i); break;
- case __AVschar: RETURN(signed char, i); break;
- case __AVuchar: RETURN(unsigned char, i); break;
- case __AVshort: RETURN(short, i); break;
- case __AVushort: RETURN(unsigned short, i); break;
- case __AVint: RETURN(int, i); break;
- case __AVuint: RETURN(unsigned int, i); break;
- case __AVlong: RETURN(long, i); break;
- case __AVulong: RETURN(unsigned long, i); break;
- case __AVfloat:
- if (l->flags & __AV_SUNCC_FLOAT_RETURN)
- RETURN(float, (float)dret);
- else
- RETURN(float, fret);
- break;
- case __AVdouble: RETURN(double, dret); break;
- case __AVvoidp: RETURN(void*, i); break;
- case __AVstruct:
- if (l->flags & __AV_PCC_STRUCT_RETURN)
- { /* pcc struct return convention: need a *(TYPE*)l->raddr = *(TYPE*)i; */
- switch (l->rsize)
- {
- case sizeof(char): RETURN(char, *(char*)i); break;
- case sizeof(short): RETURN(short, *(short*)i); break;
- case sizeof(int): RETURN(int, *(int*)i); break;
- case sizeof(double):
- ((int*)l->raddr)[0] = ((int*)i)[0];
- ((int*)l->raddr)[1] = ((int*)i)[1];
- break;
- default:
- {
- int n = (l->rsize + sizeof(__avword)-1)/sizeof(__avword);
- while (--n >= 0)
- ((__avword*)l->raddr)[n] = ((__avword*)i)[n];
- }
- break;
- }
- }
- else
- { /* normal struct return convention */
- if (l->flags & __AV_REGISTER_STRUCT_RETURN)
- switch (l->rsize)
- {
- case sizeof(char): RETURN(char, i); break;
- case sizeof(short): RETURN(short, i); break;
- case sizeof(int): RETURN(int, i); break;
- case 2*sizeof(__avword):
- ((__avword*)l->raddr)[0] = i;
- ((__avword*)l->raddr)[1] = iret2;
- break;
- default: break;
- }
- }
- break;
- default: break;
- }
- sp += __AV_ALIST_WORDS;
- return 0;
- }
-
- #endif /*_avcall_m68k_c */
-