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/**
*
* Varargs for PYR/GNU CC
*
* WARNING -- WARNING -- DANGER
*
* The code in this file implements varargs for gcc on a pyr in
* a way that is compatible with code compiled by the Pyramid Technology
* C compiler.
* As such, it depends strongly on the Pyramid conventions for
* parameter passing.ct and indepenent implementation.
* These (somewhat bizarre) paramter-passing conventions are described
* in the ``OSx Operating System Porting Guide''.
*
* A quick summary is useful:
* 12 of the 48 register-windowed regs available for
* parameter passing. Parameters of a function call that are eligible
* to be passed in registers are assigned registers from TR0/PR0 onwards;
* all other arguments are passed on the stack.
* Structure and union parameters are *never* passed in registers,
* even if they are small enough to fit. They are always passed on
* the stack.
*
* Double-sized parameters cannot be passed in TR11, because
* TR12 is not used for passing parameters. If, in the absence of this
* rule, a double-sized param would have been passed in TR11,
* that parameter is passed on the stack and no parameters are
* passed in TR11.
*
* It is only known to work for passing 32-bit integer quantities
* (ie chars, shorts, ints/enums, longs), doubles, or pointers.
* Passing structures on a Pyramid via varargs is a loser.
* Passing an object larger than 8 bytes on a pyramid via varargs may
* also be a loser.
*
*/
/*
* pointer to next stack parameter in __va_buf[0]
* pointer to next parameter register in __va_buf[1]
* Count of registers seen at __va_buf[2]
* saved pr0..pr11 in __va_buf[3..14]
* # of calls to va_arg (debugging) at __va_buf[15]
*/
typedef void *__voidptr;
#if 1
typedef struct __va_regs {
__voidptr __stackp,__regp,__count;
__voidptr __pr0,__pr1,__pr2,__pr3,__pr4,__pr5,__pr6,__pr7,__pr8,__pr9,__pr10,__pr11;
} __va_regs;
typedef __va_regs __va_buf;
#else
/* __va_buf[0] = address of next arg passed on the stack
__va_buf[1] = address of next arg passed in a register
__va_buf[2] = register-# of next arg passed in a register
*/
typedef __voidptr(*__va_buf);
#endif
#define va_alist \
__va0,__va1,__va2,__va3,__va4,__va5,__va6,__va7,__va8,__va9,__va10,__va11, \
__builtin_va_alist
#define va_dcl __voidptr va_alist;
#define va_list __va_buf
/* __asm ("rcsp %0" : "=r" ( _AP [0]));*/
#define va_start(_AP) \
_AP = ((struct __va_regs) { \
&(_AP.__pr0), (void*)&__builtin_va_alist, (void*)0, \
__va0,__va1,__va2,__va3,__va4,__va5, \
__va6,__va7,__va8,__va9,__va10,__va11})
#define va_arg(_AP, _MODE) \
({__voidptr *__ap = (__voidptr*)&_AP; \
register int __size = sizeof (_MODE); \
register int __onstack = \
(__size > 8 || ( (int)(__ap[2]) > 11) || \
(__size==8 && (int)(__ap[2])==11)); \
register int* __param_addr = ((int*)((__ap) [__onstack])); \
\
((void *)__ap[__onstack])+=__size; \
if (__onstack==0 || (int)(__ap[2])==11) \
__ap[2]+= (__size >> 2); \
*(( _MODE *)__param_addr); \
})
#define va_end(_X)
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