avcall-mips.c
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- #ifndef _avcall_mips_c /*-*- C -*-*/
- #define _avcall_mips_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 an SGI MIPS with gcc/sgi-cc.
- This calls a C function with an argument list built up using macros
- defined in av_call.h.
- SGI MIPS Argument Passing Conventions
- - The entire argument list forms a structure with all the appropriate
- holes & alignments, and space for this is allocated in the stack frame.
- - Shorter integers are promoted to word length (sizeof(int)=sizeof(long)=4).
- - Doubles are 2 words aligned on even boundaries.
- - The first 4 words of the structure are passed in registers $4...$7, stack
- space for these is always allocated. Remaining words are passed on the
- stack.
- - If the first two args are floats or doubles, they are also passed in $f12
- and $f14. But varargs functions will expect them in the integer registers
- and we can't tell whether the function is varargs so we pass them both ways.
- - Structure arguments are copies embedded in the arglist structure.
- - Structure returns are pointers to caller-allocated space passed in as the
- first argument of the list. The function also returns the pointer.
- - Integer/pointer returns are in $2, float/double returns in $f0.
- - Under IRIX 5, the called function expects to see its own address in $25.
- This file needs to be compiled with gcc for the asm extensions, but the
- assembly version of it and the header file seem to work with SGI cc.
- ----------------------------------------------------------------------*/
- #include "avcall.h.in"
- #define RETURN(TYPE,VAL) (*(TYPE*)l->raddr = (TYPE)(VAL))
- #define OFFSETOF(struct,member) ((int)&(((struct*)0)->member))
- typedef __avword (*func_pointer)();
- register func_pointer t9 __asm__("$25");
- int
- __builtin_avcall(av_alist* l)
- {
- register __avword* sp __asm__("$sp"); /* C names for registers */
- register __avword iret2 __asm__("$3");
- register float fret __asm__("$f0");
- register double dret __asm__("$f0");
- __avword *space = __builtin_alloca(__AV_ALIST_WORDS * sizeof(__avword)); /* big space for child's stack frame */
- __avword *argframe = (__avword*)sp; /* stack offset for argument list is 0 */
- int arglen = l->aptr - l->args;
- __avword i;
- if (l->flags & __AV_FLOAT_1) /* push leading float args */
- {
- __asm__("l.d $f12,%1(%0)" : : "p" (l), "i" OFFSETOF(av_alist,floatarg[0]));
- if (l->flags & __AV_FLOAT_2)
- __asm__("l.d $f14,%1(%0)" : : "p" (l), "i" OFFSETOF(av_alist,floatarg[1]));
- }
- for (i = 4; i < arglen; i++) /* push excess function args */
- argframe[i] = l->args[i];
- i = (*(t9 = l->func))(l->args[0], l->args[1], /* call function with 1st 4 args */
- l->args[2], l->args[3]);
- /* 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] = iret2;
- } else
- if (l->rtype == __AVfloat) {
- RETURN(float, fret);
- } else
- if (l->rtype == __AVdouble) {
- RETURN(double, dret);
- } else
- if (l->rtype == __AVvoidp) {
- RETURN(void*, i);
- } else
- if (l->rtype == __AVstruct) {
- if (l->flags & __AV_PCC_STRUCT_RETURN) {
- /* pcc struct return convention: need a *(TYPE*)l->raddr = *(TYPE*)i; */
- if (l->rsize == sizeof(char)) {
- 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 */
- if (l->flags & __AV_SMALL_STRUCT_RETURN) {
- if (l->rsize == sizeof(char)) {
- RETURN(char, i);
- } else
- if (l->rsize == sizeof(short)) {
- RETURN(short, i);
- } else
- if (l->rsize == sizeof(int)) {
- RETURN(int, i);
- }
- }
- }
- }
- return 0;
- }
- #endif /*_avcall_mips_c */