145 lines
4.8 KiB
C
145 lines
4.8 KiB
C
/* GNU C varargs support for the PowerPC with V.4 calling sequence */
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/* Define __gnuc_va_list. */
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#ifndef __GNUC_VA_LIST
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#define __GNUC_VA_LIST
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/* Note that the names in this structure are in the user's namespace, but
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that the V.4 abi explicitly states that these names should be used. */
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typedef struct {
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char gpr; /* index into the array of 8 GPRs stored in the
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register save area gpr=0 corresponds to r3,
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gpr=1 to r4, etc. */
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char fpr; /* index into the array of 8 FPRs stored in the
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register save area fpr=0 corresponds to f1,
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fpr=1 to f2, etc. */
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char *overflow_arg_area; /* location on stack that holds the next
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overflow argument */
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char *reg_save_area; /* where r3:r10 and f1:f8, if saved are stored */
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} __gnuc_va_list[1];
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#endif /* not __GNUC_VA_LIST */
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/* If this is for internal libc use, don't define anything but
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__gnuc_va_list. */
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#if defined (_STDARG_H) || defined (_VARARGS_H)
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/* Register save area located below the frame pointer */
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typedef struct {
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long __gp_save[8]; /* save area for GP registers */
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double __fp_save[8]; /* save area for FP registers */
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} __va_regsave_t;
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/* Macros to access the register save area */
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/* We cast to void * and then to TYPE * because this avoids
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a warning about increasing the alignment requirement. */
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#define __VA_FP_REGSAVE(AP,TYPE) \
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((TYPE *) (void *) (&(((__va_regsave_t *) \
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(AP)->reg_save_area)->__fp_save[(int)(AP)->fpr])))
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#define __VA_GP_REGSAVE(AP,TYPE) \
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((TYPE *) (void *) (&(((__va_regsave_t *) \
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(AP)->reg_save_area)->__gp_save[(int)(AP)->gpr])))
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/* Common code for va_start for both varargs and stdarg. This depends
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on the format of rs6000_args in rs6000.h. The fields used are:
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#0 WORDS # words used for GP regs/stack values
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#1 FREGNO next available FP register
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#2 NARGS_PROTOTYPE # args left in the current prototype
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#3 ORIG_NARGS original value of NARGS_PROTOTYPE
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#4 VARARGS_OFFSET offset from frame pointer of varargs area */
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#define __va_words __builtin_args_info (0)
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#define __va_fregno __builtin_args_info (1)
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#define __va_nargs __builtin_args_info (2)
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#define __va_orig_nargs __builtin_args_info (3)
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#define __va_varargs_offset __builtin_args_info (4)
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#define __va_start_common(AP, FAKE) \
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__extension__ ({ \
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register int __words = __va_words - FAKE; \
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\
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(AP)->gpr = (__words < 8) ? __words : 8; \
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(AP)->fpr = __va_fregno - 33; \
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(AP)->reg_save_area = (((char *) __builtin_frame_address (0)) \
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+ __va_varargs_offset); \
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(AP)->overflow_arg_area = ((char *)__builtin_saveregs () \
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+ (((__words >= 8) ? __words - 8 : 0) \
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* sizeof (long))); \
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(void)0; \
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})
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#ifdef _STDARG_H /* stdarg.h support */
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/* Calling __builtin_next_arg gives the proper error message if LASTARG is
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not indeed the last argument. */
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#define va_start(AP,LASTARG) \
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(__builtin_next_arg (LASTARG), __va_start_common (AP, 0))
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#else /* varargs.h support */
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#define va_start(AP) __va_start_common (AP, 1)
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#define va_alist __va_1st_arg
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#define va_dcl register int va_alist; ...
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#endif /* _STDARG_H */
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#ifdef _SOFT_FLOAT
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#define __va_float_p(TYPE) 0
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#else
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#define __va_float_p(TYPE) (__builtin_classify_type(*(TYPE *)0) == 8)
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#endif
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#define __va_aggregate_p(TYPE) (__builtin_classify_type(*(TYPE *)0) >= 12)
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#define __va_size(TYPE) ((sizeof(TYPE) + sizeof (long) - 1) / sizeof (long))
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#define va_arg(AP,TYPE) \
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__extension__ (*({ \
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register TYPE *__ptr; \
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\
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if (__va_float_p (TYPE) && (AP)->fpr < 8) \
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{ \
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__ptr = __VA_FP_REGSAVE (AP, TYPE); \
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(AP)->fpr++; \
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} \
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\
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else if (__va_aggregate_p (TYPE) && (AP)->gpr < 8) \
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{ \
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__ptr = * __VA_GP_REGSAVE (AP, TYPE *); \
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(AP)->gpr++; \
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} \
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\
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else if (!__va_float_p (TYPE) && !__va_aggregate_p (TYPE) \
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&& (AP)->gpr + __va_size(TYPE) <= 8) \
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{ \
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__ptr = __VA_GP_REGSAVE (AP, TYPE); \
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(AP)->gpr += __va_size (TYPE); \
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} \
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\
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else if (!__va_float_p (TYPE) && !__va_aggregate_p (TYPE) \
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&& (AP)->gpr < 8) \
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{ \
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(AP)->gpr = 8; \
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__ptr = (TYPE *) (void *) ((AP)->overflow_arg_area); \
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(AP)->overflow_arg_area += __va_size (TYPE) * sizeof (long); \
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} \
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\
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else if (__va_aggregate_p (TYPE)) \
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{ \
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__ptr = * (TYPE **) (void *) ((AP)->overflow_arg_area); \
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(AP)->overflow_arg_area += sizeof (TYPE *); \
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} \
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else \
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{ \
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__ptr = (TYPE *) (void *) ((AP)->overflow_arg_area); \
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(AP)->overflow_arg_area += __va_size (TYPE) * sizeof (long); \
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} \
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\
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__ptr; \
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}))
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#define va_end(AP) ((void)0)
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#endif /* defined (_STDARG_H) || defined (_VARARGS_H) */
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