avcall-arm.c
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- #ifndef _avcall_arm_c /*-*- C -*-*/
- #define _avcall_arm_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 Acorn Risc Maschine with gcc.
- This calls a C function with an argument list built up using macros
- defined in av_call.h.
- ARM Argument Passing Conventions:
- All arguments, except the first 4 words, 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 "%r0".
- 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__("r13"); /* C names for registers */
- /*register __avword iret __asm__("r0"); */
- register __avword iret2 __asm__("r1");
- register float fret __asm__("r0"); /* r0 */
- register double dret __asm__("r0"); /* r0,r1 */
- __avword space[__AV_ALIST_WORDS]; /* space for callee's stack frame */
- __avword* argframe = sp; /* stack offset for argument list */
- int arglen = l->aptr - l->args;
- __avword i;
- for (i = 4; i < arglen; i++) /* push function args onto stack */
- argframe[i-4] = l->args[i];
- /* call function, pass 4 args in registers */
- i = (*l->func)(l->args[0], l->args[1], 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) {
- /* NB: On arm, all structure sizes are divisible by 4. */
- 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)) { /* can't occur */
- 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+3)/4;
- while (--n >= 0)
- ((__avword*)l->raddr)[n] = ((__avword*)i)[n];
- }
- } else {
- /* normal struct return convention */
- if (l->flags & __AV_REGISTER_STRUCT_RETURN) {
- if (l->rsize == sizeof(char)) { /* can't occur */
- RETURN(char, i);
- } else
- if (l->rsize == sizeof(short)) { /* can't occur */
- RETURN(short, i);
- } else
- if (l->rsize == sizeof(int)) {
- RETURN(int, i);
- } else
- if (l->rsize == 2*sizeof(__avword)) {
- ((__avword*)l->raddr)[0] = i;
- ((__avword*)l->raddr)[1] = iret2;
- }
- }
- }
- }
- return 0;
- }
- #endif /*_avcall_arm_c */