diff options
Diffstat (limited to 'gcc-4.9/libffi/src/powerpc/ffi_darwin.c')
| -rw-r--r-- | gcc-4.9/libffi/src/powerpc/ffi_darwin.c | 1359 |
1 files changed, 1359 insertions, 0 deletions
diff --git a/gcc-4.9/libffi/src/powerpc/ffi_darwin.c b/gcc-4.9/libffi/src/powerpc/ffi_darwin.c new file mode 100644 index 000000000..dd897f4c6 --- /dev/null +++ b/gcc-4.9/libffi/src/powerpc/ffi_darwin.c @@ -0,0 +1,1359 @@ +/* ----------------------------------------------------------------------- + ffi_darwin.c + + Copyright (C) 1998 Geoffrey Keating + Copyright (C) 2001 John Hornkvist + Copyright (C) 2002, 2006, 2007, 2009, 2010 Free Software Foundation, Inc. + + FFI support for Darwin and AIX. + + Permission is hereby granted, free of charge, to any person obtaining + a copy of this software and associated documentation files (the + ``Software''), to deal in the Software without restriction, including + without limitation the rights to use, copy, modify, merge, publish, + distribute, sublicense, and/or sell copies of the Software, and to + permit persons to whom the Software is furnished to do so, subject to + the following conditions: + + The above copyright notice and this permission notice shall be included + in all copies or substantial portions of the Software. + + THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, EXPRESS + OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. + IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR + OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + OTHER DEALINGS IN THE SOFTWARE. + ----------------------------------------------------------------------- */ + +#include <ffi.h> +#include <ffi_common.h> + +#include <stdlib.h> + +extern void ffi_closure_ASM (void); + +enum { + /* The assembly depends on these exact flags. + For Darwin64 (when FLAG_RETURNS_STRUCT is set): + FLAG_RETURNS_FP indicates that the structure embeds FP data. + FLAG_RETURNS_128BITS signals a special struct size that is not + expanded for float content. */ + FLAG_RETURNS_128BITS = 1 << (31-31), /* These go in cr7 */ + FLAG_RETURNS_NOTHING = 1 << (31-30), + FLAG_RETURNS_FP = 1 << (31-29), + FLAG_RETURNS_64BITS = 1 << (31-28), + + FLAG_RETURNS_STRUCT = 1 << (31-27), /* This goes in cr6 */ + + FLAG_ARG_NEEDS_COPY = 1 << (31- 7), + FLAG_FP_ARGUMENTS = 1 << (31- 6), /* cr1.eq; specified by ABI */ + FLAG_4_GPR_ARGUMENTS = 1 << (31- 5), + FLAG_RETVAL_REFERENCE = 1 << (31- 4) +}; + +/* About the DARWIN ABI. */ +enum { + NUM_GPR_ARG_REGISTERS = 8, + NUM_FPR_ARG_REGISTERS = 13, + LINKAGE_AREA_GPRS = 6 +}; + +enum { ASM_NEEDS_REGISTERS = 4 }; /* r28-r31 */ + +/* ffi_prep_args is called by the assembly routine once stack space + has been allocated for the function's arguments. + + m32/m64 + + The stack layout we want looks like this: + + | Return address from ffi_call_DARWIN | higher addresses + |--------------------------------------------| + | Previous backchain pointer 4/8 | stack pointer here + |--------------------------------------------|<+ <<< on entry to + | ASM_NEEDS_REGISTERS=r28-r31 4*(4/8) | | ffi_call_DARWIN + |--------------------------------------------| | + | When we have any FP activity... the | | + | FPRs occupy NUM_FPR_ARG_REGISTERS slots | | + | here fp13 .. fp1 from high to low addr. | | + ~ ~ ~ + | Parameters (at least 8*4/8=32/64) | | NUM_GPR_ARG_REGISTERS + |--------------------------------------------| | + | TOC=R2 (AIX) Reserved (Darwin) 4/8 | | + |--------------------------------------------| | stack | + | Reserved 2*4/8 | | grows | + |--------------------------------------------| | down V + | Space for callee's LR 4/8 | | + |--------------------------------------------| | lower addresses + | Saved CR [low word for m64] 4/8 | | + |--------------------------------------------| | stack pointer here + | Current backchain pointer 4/8 |-/ during + |--------------------------------------------| <<< ffi_call_DARWIN + + */ + +#if defined(POWERPC_DARWIN64) +static void +darwin64_pass_struct_by_value + (ffi_type *, char *, unsigned, unsigned *, double **, unsigned long **); +#endif + +/* This depends on GPR_SIZE = sizeof (unsigned long) */ + +void +ffi_prep_args (extended_cif *ecif, unsigned long *const stack) +{ + const unsigned bytes = ecif->cif->bytes; + const unsigned flags = ecif->cif->flags; + const unsigned nargs = ecif->cif->nargs; +#if !defined(POWERPC_DARWIN64) + const ffi_abi abi = ecif->cif->abi; +#endif + + /* 'stacktop' points at the previous backchain pointer. */ + unsigned long *const stacktop = stack + (bytes / sizeof(unsigned long)); + + /* 'fpr_base' points at the space for fpr1, and grows upwards as + we use FPR registers. */ + double *fpr_base = (double *) (stacktop - ASM_NEEDS_REGISTERS) - NUM_FPR_ARG_REGISTERS; + int gp_count = 0, fparg_count = 0; + + /* 'next_arg' grows up as we put parameters in it. */ + unsigned long *next_arg = stack + LINKAGE_AREA_GPRS; /* 6 reserved positions. */ + + int i; + double double_tmp; + void **p_argv = ecif->avalue; + unsigned long gprvalue; + ffi_type** ptr = ecif->cif->arg_types; +#if !defined(POWERPC_DARWIN64) + char *dest_cpy; +#endif + unsigned size_al = 0; + + /* Check that everything starts aligned properly. */ + FFI_ASSERT(((unsigned) (char *) stack & 0xF) == 0); + FFI_ASSERT(((unsigned) (char *) stacktop & 0xF) == 0); + FFI_ASSERT((bytes & 0xF) == 0); + + /* Deal with return values that are actually pass-by-reference. + Rule: + Return values are referenced by r3, so r4 is the first parameter. */ + + if (flags & FLAG_RETVAL_REFERENCE) + *next_arg++ = (unsigned long) (char *) ecif->rvalue; + + /* Now for the arguments. */ + for (i = nargs; i > 0; i--, ptr++, p_argv++) + { + switch ((*ptr)->type) + { + /* If a floating-point parameter appears before all of the general- + purpose registers are filled, the corresponding GPRs that match + the size of the floating-point parameter are skipped. */ + case FFI_TYPE_FLOAT: + double_tmp = *(float *) *p_argv; + if (fparg_count < NUM_FPR_ARG_REGISTERS) + *fpr_base++ = double_tmp; +#if defined(POWERPC_DARWIN) + *(float *)next_arg = *(float *) *p_argv; +#else + *(double *)next_arg = double_tmp; +#endif + next_arg++; + gp_count++; + fparg_count++; + FFI_ASSERT(flags & FLAG_FP_ARGUMENTS); + break; + + case FFI_TYPE_DOUBLE: + double_tmp = *(double *) *p_argv; + if (fparg_count < NUM_FPR_ARG_REGISTERS) + *fpr_base++ = double_tmp; + *(double *)next_arg = double_tmp; +#ifdef POWERPC64 + next_arg++; + gp_count++; +#else + next_arg += 2; + gp_count += 2; +#endif + fparg_count++; + FFI_ASSERT(flags & FLAG_FP_ARGUMENTS); + break; + +#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE + + case FFI_TYPE_LONGDOUBLE: +# if defined(POWERPC64) && !defined(POWERPC_DARWIN64) + /* ??? This will exceed the regs count when the value starts at fp13 + and it will not put the extra bit on the stack. */ + if (fparg_count < NUM_FPR_ARG_REGISTERS) + *(long double *) fpr_base++ = *(long double *) *p_argv; + else + *(long double *) next_arg = *(long double *) *p_argv; + next_arg += 2; + fparg_count += 2; +# else + double_tmp = ((double *) *p_argv)[0]; + if (fparg_count < NUM_FPR_ARG_REGISTERS) + *fpr_base++ = double_tmp; + *(double *) next_arg = double_tmp; +# if defined(POWERPC_DARWIN64) + next_arg++; + gp_count++; +# else + next_arg += 2; + gp_count += 2; +# endif + fparg_count++; + double_tmp = ((double *) *p_argv)[1]; + if (fparg_count < NUM_FPR_ARG_REGISTERS) + *fpr_base++ = double_tmp; + *(double *) next_arg = double_tmp; +# if defined(POWERPC_DARWIN64) + next_arg++; + gp_count++; +# else + next_arg += 2; + gp_count += 2; +# endif + fparg_count++; +# endif + FFI_ASSERT(flags & FLAG_FP_ARGUMENTS); + break; +#endif + case FFI_TYPE_UINT64: + case FFI_TYPE_SINT64: +#ifdef POWERPC64 + gprvalue = *(long long *) *p_argv; + goto putgpr; +#else + *(long long *) next_arg = *(long long *) *p_argv; + next_arg += 2; + gp_count += 2; +#endif + break; + case FFI_TYPE_POINTER: + gprvalue = *(unsigned long *) *p_argv; + goto putgpr; + case FFI_TYPE_UINT8: + gprvalue = *(unsigned char *) *p_argv; + goto putgpr; + case FFI_TYPE_SINT8: + gprvalue = *(signed char *) *p_argv; + goto putgpr; + case FFI_TYPE_UINT16: + gprvalue = *(unsigned short *) *p_argv; + goto putgpr; + case FFI_TYPE_SINT16: + gprvalue = *(signed short *) *p_argv; + goto putgpr; + + case FFI_TYPE_STRUCT: + size_al = (*ptr)->size; +#if defined(POWERPC_DARWIN64) + next_arg = (unsigned long *)ALIGN((char *)next_arg, (*ptr)->alignment); + darwin64_pass_struct_by_value (*ptr, (char *) *p_argv, + (unsigned) size_al, + (unsigned int *) &fparg_count, + &fpr_base, &next_arg); +#else + dest_cpy = (char *) next_arg; + + /* If the first member of the struct is a double, then include enough + padding in the struct size to align it to double-word. */ + if ((*ptr)->elements[0]->type == FFI_TYPE_DOUBLE) + size_al = ALIGN((*ptr)->size, 8); + +# if defined(POWERPC64) + FFI_ASSERT (abi != FFI_DARWIN); + memcpy ((char *) dest_cpy, (char *) *p_argv, size_al); + next_arg += (size_al + 7) / 8; +# else + /* Structures that match the basic modes (QI 1 byte, HI 2 bytes, + SI 4 bytes) are aligned as if they were those modes. + Structures with 3 byte in size are padded upwards. */ + if (size_al < 3 && abi == FFI_DARWIN) + dest_cpy += 4 - size_al; + + memcpy((char *) dest_cpy, (char *) *p_argv, size_al); + next_arg += (size_al + 3) / 4; +# endif +#endif + break; + + case FFI_TYPE_INT: + case FFI_TYPE_SINT32: + gprvalue = *(signed int *) *p_argv; + goto putgpr; + + case FFI_TYPE_UINT32: + gprvalue = *(unsigned int *) *p_argv; + putgpr: + *next_arg++ = gprvalue; + gp_count++; + break; + default: + break; + } + } + + /* Check that we didn't overrun the stack... */ + //FFI_ASSERT(gpr_base <= stacktop - ASM_NEEDS_REGISTERS); + //FFI_ASSERT((unsigned *)fpr_base + // <= stacktop - ASM_NEEDS_REGISTERS - NUM_GPR_ARG_REGISTERS); + //FFI_ASSERT(flags & FLAG_4_GPR_ARGUMENTS || intarg_count <= 4); +} + +#if defined(POWERPC_DARWIN64) + +/* See if we can put some of the struct into fprs. + This should not be called for structures of size 16 bytes, since these are not + broken out this way. */ +static void +darwin64_scan_struct_for_floats (ffi_type *s, unsigned *nfpr) +{ + int i; + + FFI_ASSERT (s->type == FFI_TYPE_STRUCT) + + for (i = 0; s->elements[i] != NULL; i++) + { + ffi_type *p = s->elements[i]; + switch (p->type) + { + case FFI_TYPE_STRUCT: + darwin64_scan_struct_for_floats (p, nfpr); + break; + case FFI_TYPE_LONGDOUBLE: + (*nfpr) += 2; + break; + case FFI_TYPE_DOUBLE: + case FFI_TYPE_FLOAT: + (*nfpr) += 1; + break; + default: + break; + } + } +} + +static int +darwin64_struct_size_exceeds_gprs_p (ffi_type *s, char *src, unsigned *nfpr) +{ + unsigned struct_offset=0, i; + + for (i = 0; s->elements[i] != NULL; i++) + { + char *item_base; + ffi_type *p = s->elements[i]; + /* Find the start of this item (0 for the first one). */ + if (i > 0) + struct_offset = ALIGN(struct_offset, p->alignment); + + item_base = src + struct_offset; + + switch (p->type) + { + case FFI_TYPE_STRUCT: + if (darwin64_struct_size_exceeds_gprs_p (p, item_base, nfpr)) + return 1; + break; + case FFI_TYPE_LONGDOUBLE: + if (*nfpr >= NUM_FPR_ARG_REGISTERS) + return 1; + (*nfpr) += 1; + item_base += 8; + /* FALL THROUGH */ + case FFI_TYPE_DOUBLE: + if (*nfpr >= NUM_FPR_ARG_REGISTERS) + return 1; + (*nfpr) += 1; + break; + case FFI_TYPE_FLOAT: + if (*nfpr >= NUM_FPR_ARG_REGISTERS) + return 1; + (*nfpr) += 1; + break; + default: + /* If we try and place any item, that is non-float, once we've + exceeded the 8 GPR mark, then we can't fit the struct. */ + if ((unsigned long)item_base >= 8*8) + return 1; + break; + } + /* now count the size of what we just used. */ + struct_offset += p->size; + } + return 0; +} + +/* Can this struct be returned by value? */ +int +darwin64_struct_ret_by_value_p (ffi_type *s) +{ + unsigned nfp = 0; + + FFI_ASSERT (s && s->type == FFI_TYPE_STRUCT); + + /* The largest structure we can return is 8long + 13 doubles. */ + if (s->size > 168) + return 0; + + /* We can't pass more than 13 floats. */ + darwin64_scan_struct_for_floats (s, &nfp); + if (nfp > 13) + return 0; + + /* If there are not too many floats, and the struct is + small enough to accommodate in the GPRs, then it must be OK. */ + if (s->size <= 64) + return 1; + + /* Well, we have to look harder. */ + nfp = 0; + if (darwin64_struct_size_exceeds_gprs_p (s, NULL, &nfp)) + return 0; + + return 1; +} + +void +darwin64_pass_struct_floats (ffi_type *s, char *src, + unsigned *nfpr, double **fprs) +{ + int i; + double *fpr_base = *fprs; + unsigned struct_offset = 0; + + /* We don't assume anything about the alignment of the source. */ + for (i = 0; s->elements[i] != NULL; i++) + { + char *item_base; + ffi_type *p = s->elements[i]; + /* Find the start of this item (0 for the first one). */ + if (i > 0) + struct_offset = ALIGN(struct_offset, p->alignment); + item_base = src + struct_offset; + + switch (p->type) + { + case FFI_TYPE_STRUCT: + darwin64_pass_struct_floats (p, item_base, nfpr, + &fpr_base); + break; + case FFI_TYPE_LONGDOUBLE: + if (*nfpr < NUM_FPR_ARG_REGISTERS) + *fpr_base++ = *(double *)item_base; + (*nfpr) += 1; + item_base += 8; + /* FALL THROUGH */ + case FFI_TYPE_DOUBLE: + if (*nfpr < NUM_FPR_ARG_REGISTERS) + *fpr_base++ = *(double *)item_base; + (*nfpr) += 1; + break; + case FFI_TYPE_FLOAT: + if (*nfpr < NUM_FPR_ARG_REGISTERS) + *fpr_base++ = (double) *(float *)item_base; + (*nfpr) += 1; + break; + default: + break; + } + /* now count the size of what we just used. */ + struct_offset += p->size; + } + /* Update the scores. */ + *fprs = fpr_base; +} + +/* Darwin64 special rules. + Break out a struct into params and float registers. */ +static void +darwin64_pass_struct_by_value (ffi_type *s, char *src, unsigned size, + unsigned *nfpr, double **fprs, unsigned long **arg) +{ + unsigned long *next_arg = *arg; + char *dest_cpy = (char *)next_arg; + + FFI_ASSERT (s->type == FFI_TYPE_STRUCT) + + if (!size) + return; + + /* First... special cases. */ + if (size < 3 + || (size == 4 + && s->elements[0] + && s->elements[0]->type != FFI_TYPE_FLOAT)) + { + /* Must be at least one GPR, padding is unspecified in value, + let's make it zero. */ + *next_arg = 0UL; + dest_cpy += 8 - size; + memcpy ((char *) dest_cpy, src, size); + next_arg++; + } + else if (size == 16) + { + memcpy ((char *) dest_cpy, src, size); + next_arg += 2; + } + else + { + /* now the general case, we consider embedded floats. */ + memcpy ((char *) dest_cpy, src, size); + darwin64_pass_struct_floats (s, src, nfpr, fprs); + next_arg += (size+7)/8; + } + + *arg = next_arg; +} + +double * +darwin64_struct_floats_to_mem (ffi_type *s, char *dest, double *fprs, unsigned *nf) +{ + int i; + unsigned struct_offset = 0; + + /* We don't assume anything about the alignment of the source. */ + for (i = 0; s->elements[i] != NULL; i++) + { + char *item_base; + ffi_type *p = s->elements[i]; + /* Find the start of this item (0 for the first one). */ + if (i > 0) + struct_offset = ALIGN(struct_offset, p->alignment); + item_base = dest + struct_offset; + + switch (p->type) + { + case FFI_TYPE_STRUCT: + fprs = darwin64_struct_floats_to_mem (p, item_base, fprs, nf); + break; + case FFI_TYPE_LONGDOUBLE: + if (*nf < NUM_FPR_ARG_REGISTERS) + { + *(double *)item_base = *fprs++ ; + (*nf) += 1; + } + item_base += 8; + /* FALL THROUGH */ + case FFI_TYPE_DOUBLE: + if (*nf < NUM_FPR_ARG_REGISTERS) + { + *(double *)item_base = *fprs++ ; + (*nf) += 1; + } + break; + case FFI_TYPE_FLOAT: + if (*nf < NUM_FPR_ARG_REGISTERS) + { + *(float *)item_base = (float) *fprs++ ; + (*nf) += 1; + } + break; + default: + break; + } + /* now count the size of what we just used. */ + struct_offset += p->size; + } + return fprs; +} + +#endif + +/* Adjust the size of S to be correct for Darwin. + On Darwin m32, the first field of a structure has natural alignment. + On Darwin m64, all fields have natural alignment. */ + +static void +darwin_adjust_aggregate_sizes (ffi_type *s) +{ + int i; + + if (s->type != FFI_TYPE_STRUCT) + return; + + s->size = 0; + for (i = 0; s->elements[i] != NULL; i++) + { + ffi_type *p; + int align; + + p = s->elements[i]; + if (p->type == FFI_TYPE_STRUCT) + darwin_adjust_aggregate_sizes (p); +#if defined(POWERPC_DARWIN64) + /* Natural alignment for all items. */ + align = p->alignment; +#else + /* Natrual alignment for the first item... */ + if (i == 0) + align = p->alignment; + else if (p->alignment == 16 || p->alignment < 4) + /* .. subsequent items with vector or align < 4 have natural align. */ + align = p->alignment; + else + /* .. or align is 4. */ + align = 4; +#endif + /* Pad, if necessary, before adding the current item. */ + s->size = ALIGN(s->size, align) + p->size; + } + + s->size = ALIGN(s->size, s->alignment); + + /* This should not be necessary on m64, but harmless. */ + if (s->elements[0]->type == FFI_TYPE_UINT64 + || s->elements[0]->type == FFI_TYPE_SINT64 + || s->elements[0]->type == FFI_TYPE_DOUBLE + || s->elements[0]->alignment == 8) + s->alignment = s->alignment > 8 ? s->alignment : 8; + /* Do not add additional tail padding. */ +} + +/* Adjust the size of S to be correct for AIX. + Word-align double unless it is the first member of a structure. */ + +static void +aix_adjust_aggregate_sizes (ffi_type *s) +{ + int i; + + if (s->type != FFI_TYPE_STRUCT) + return; + + s->size = 0; + for (i = 0; s->elements[i] != NULL; i++) + { + ffi_type *p; + int align; + + p = s->elements[i]; + aix_adjust_aggregate_sizes (p); + align = p->alignment; + if (i != 0 && p->type == FFI_TYPE_DOUBLE) + align = 4; + s->size = ALIGN(s->size, align) + p->size; + } + + s->size = ALIGN(s->size, s->alignment); + + if (s->elements[0]->type == FFI_TYPE_UINT64 + || s->elements[0]->type == FFI_TYPE_SINT64 + || s->elements[0]->type == FFI_TYPE_DOUBLE + || s->elements[0]->alignment == 8) + s->alignment = s->alignment > 8 ? s->alignment : 8; + /* Do not add additional tail padding. */ +} + +/* Perform machine dependent cif processing. */ +ffi_status +ffi_prep_cif_machdep (ffi_cif *cif) +{ + /* All this is for the DARWIN ABI. */ + unsigned i; + ffi_type **ptr; + unsigned bytes; + unsigned fparg_count = 0, intarg_count = 0; + unsigned flags = 0; + unsigned size_al = 0; + + /* All the machine-independent calculation of cif->bytes will be wrong. + All the calculation of structure sizes will also be wrong. + Redo the calculation for DARWIN. */ + + if (cif->abi == FFI_DARWIN) + { + darwin_adjust_aggregate_sizes (cif->rtype); + for (i = 0; i < cif->nargs; i++) + darwin_adjust_aggregate_sizes (cif->arg_types[i]); + } + + if (cif->abi == FFI_AIX) + { + aix_adjust_aggregate_sizes (cif->rtype); + for (i = 0; i < cif->nargs; i++) + aix_adjust_aggregate_sizes (cif->arg_types[i]); + } + + /* Space for the frame pointer, callee's LR, CR, etc, and for + the asm's temp regs. */ + + bytes = (LINKAGE_AREA_GPRS + ASM_NEEDS_REGISTERS) * sizeof(unsigned long); + + /* Return value handling. + The rules m32 are as follows: + - 32-bit (or less) integer values are returned in gpr3; + - structures of size <= 4 bytes also returned in gpr3; + - 64-bit integer values [??? and structures between 5 and 8 bytes] are + returned in gpr3 and gpr4; + - Single/double FP values are returned in fpr1; + - Long double FP (if not equivalent to double) values are returned in + fpr1 and fpr2; + m64: + - 64-bit or smaller integral values are returned in GPR3 + - Single/double FP values are returned in fpr1; + - Long double FP values are returned in fpr1 and fpr2; + m64 Structures: + - If the structure could be accommodated in registers were it to be the + first argument to a routine, then it is returned in those registers. + m32/m64 structures otherwise: + - Larger structures values are allocated space and a pointer is passed + as the first argument. */ + switch (cif->rtype->type) + { + +#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE + case FFI_TYPE_LONGDOUBLE: + flags |= FLAG_RETURNS_128BITS; + flags |= FLAG_RETURNS_FP; + break; +#endif + + case FFI_TYPE_DOUBLE: + flags |= FLAG_RETURNS_64BITS; + /* Fall through. */ + case FFI_TYPE_FLOAT: + flags |= FLAG_RETURNS_FP; + break; + + case FFI_TYPE_UINT64: + case FFI_TYPE_SINT64: +#ifdef POWERPC64 + case FFI_TYPE_POINTER: +#endif + flags |= FLAG_RETURNS_64BITS; + break; + + case FFI_TYPE_STRUCT: +#if defined(POWERPC_DARWIN64) + { + /* Can we fit the struct into regs? */ + if (darwin64_struct_ret_by_value_p (cif->rtype)) + { + unsigned nfpr = 0; + flags |= FLAG_RETURNS_STRUCT; + if (cif->rtype->size != 16) + darwin64_scan_struct_for_floats (cif->rtype, &nfpr) ; + else + flags |= FLAG_RETURNS_128BITS; + /* Will be 0 for 16byte struct. */ + if (nfpr) + flags |= FLAG_RETURNS_FP; + } + else /* By ref. */ + { + flags |= FLAG_RETVAL_REFERENCE; + flags |= FLAG_RETURNS_NOTHING; + intarg_count++; + } + } +#elif defined(DARWIN_PPC) + if (cif->rtype->size <= 4) + flags |= FLAG_RETURNS_STRUCT; + else /* else by reference. */ + { + flags |= FLAG_RETVAL_REFERENCE; + flags |= FLAG_RETURNS_NOTHING; + intarg_count++; + } +#else /* assume we pass by ref. */ + flags |= FLAG_RETVAL_REFERENCE; + flags |= FLAG_RETURNS_NOTHING; + intarg_count++; +#endif + break; + case FFI_TYPE_VOID: + flags |= FLAG_RETURNS_NOTHING; + break; + + default: + /* Returns 32-bit integer, or similar. Nothing to do here. */ + break; + } + + /* The first NUM_GPR_ARG_REGISTERS words of integer arguments, and the + first NUM_FPR_ARG_REGISTERS fp arguments, go in registers; the rest + goes on the stack. + ??? Structures are passed as a pointer to a copy of the structure. + Stuff on the stack needs to keep proper alignment. + For m64 the count is effectively of half-GPRs. */ + for (ptr = cif->arg_types, i = cif->nargs; i > 0; i--, ptr++) + { + unsigned align_words; + switch ((*ptr)->type) + { + case FFI_TYPE_FLOAT: + case FFI_TYPE_DOUBLE: + fparg_count++; +#if !defined(POWERPC_DARWIN64) + /* If this FP arg is going on the stack, it must be + 8-byte-aligned. */ + if (fparg_count > NUM_FPR_ARG_REGISTERS + && (intarg_count & 0x01) != 0) + intarg_count++; +#endif + break; + +#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE + case FFI_TYPE_LONGDOUBLE: + fparg_count += 2; + /* If this FP arg is going on the stack, it must be + 16-byte-aligned. */ + if (fparg_count >= NUM_FPR_ARG_REGISTERS) +#if defined (POWERPC64) + intarg_count = ALIGN(intarg_count, 2); +#else + intarg_count = ALIGN(intarg_count, 4); +#endif + break; +#endif + + case FFI_TYPE_UINT64: + case FFI_TYPE_SINT64: +#if defined(POWERPC64) + intarg_count++; +#else + /* 'long long' arguments are passed as two words, but + either both words must fit in registers or both go + on the stack. If they go on the stack, they must + be 8-byte-aligned. */ + if (intarg_count == NUM_GPR_ARG_REGISTERS-1 + || (intarg_count >= NUM_GPR_ARG_REGISTERS + && (intarg_count & 0x01) != 0)) + intarg_count++; + intarg_count += 2; +#endif + break; + + case FFI_TYPE_STRUCT: + size_al = (*ptr)->size; +#if defined(POWERPC_DARWIN64) + align_words = (*ptr)->alignment >> 3; + if (align_words) + intarg_count = ALIGN(intarg_count, align_words); + /* Base size of the struct. */ + intarg_count += (size_al + 7) / 8; + /* If 16 bytes then don't worry about floats. */ + if (size_al != 16) + /* Scan through for floats to be placed in regs. */ + darwin64_scan_struct_for_floats (*ptr, &fparg_count) ; +#else + align_words = (*ptr)->alignment >> 2; + if (align_words) + intarg_count = ALIGN(intarg_count, align_words); + /* If the first member of the struct is a double, then align + the struct to double-word. + if ((*ptr)->elements[0]->type == FFI_TYPE_DOUBLE) + size_al = ALIGN((*ptr)->size, 8); */ +# ifdef POWERPC64 + intarg_count += (size_al + 7) / 8; +# else + intarg_count += (size_al + 3) / 4; +# endif +#endif + break; + + default: + /* Everything else is passed as a 4-byte word in a GPR, either + the object itself or a pointer to it. */ + intarg_count++; + break; + } + } + + if (fparg_count != 0) + flags |= FLAG_FP_ARGUMENTS; + +#if defined(POWERPC_DARWIN64) + /* Space to image the FPR registers, if needed - which includes when they might be + used in a struct return. */ + if (fparg_count != 0 + || ((flags & FLAG_RETURNS_STRUCT) + && (flags & FLAG_RETURNS_FP))) + bytes += NUM_FPR_ARG_REGISTERS * sizeof(double); +#else + /* Space for the FPR registers, if needed. */ + if (fparg_count != 0) + bytes += NUM_FPR_ARG_REGISTERS * sizeof(double); +#endif + + /* Stack space. */ +#ifdef POWERPC64 + if ((intarg_count + fparg_count) > NUM_GPR_ARG_REGISTERS) + bytes += (intarg_count + fparg_count) * sizeof(long); +#else + if ((intarg_count + 2 * fparg_count) > NUM_GPR_ARG_REGISTERS) + bytes += (intarg_count + 2 * fparg_count) * sizeof(long); +#endif + else + bytes += NUM_GPR_ARG_REGISTERS * sizeof(long); + + /* The stack space allocated needs to be a multiple of 16 bytes. */ + bytes = ALIGN(bytes, 16) ; + + cif->flags = flags; + cif->bytes = bytes; + + return FFI_OK; +} + +extern void ffi_call_AIX(extended_cif *, long, unsigned, unsigned *, + void (*fn)(void), void (*fn2)(void)); + +extern void ffi_call_DARWIN(extended_cif *, long, unsigned, unsigned *, + void (*fn)(void), void (*fn2)(void), ffi_type*); + +void +ffi_call (ffi_cif *cif, void (*fn)(void), void *rvalue, void **avalue) +{ + extended_cif ecif; + + ecif.cif = cif; + ecif.avalue = avalue; + + /* If the return value is a struct and we don't have a return + value address then we need to make one. */ + + if ((rvalue == NULL) && + (cif->rtype->type == FFI_TYPE_STRUCT)) + { + ecif.rvalue = alloca (cif->rtype->size); + } + else + ecif.rvalue = rvalue; + + switch (cif->abi) + { + case FFI_AIX: + ffi_call_AIX(&ecif, -(long)cif->bytes, cif->flags, ecif.rvalue, fn, + FFI_FN(ffi_prep_args)); + break; + case FFI_DARWIN: + ffi_call_DARWIN(&ecif, -(long)cif->bytes, cif->flags, ecif.rvalue, fn, + FFI_FN(ffi_prep_args), cif->rtype); + break; + default: + FFI_ASSERT(0); + break; + } +} + +static void flush_icache(char *); +static void flush_range(char *, int); + +/* The layout of a function descriptor. A C function pointer really + points to one of these. */ + +typedef struct aix_fd_struct { + void *code_pointer; + void *toc; +} aix_fd; + +/* here I'd like to add the stack frame layout we use in darwin_closure.S + and aix_closure.S + + m32/m64 + + The stack layout looks like this: + + | Additional params... | | Higher address + ~ ~ ~ + | Parameters (at least 8*4/8=32/64) | | NUM_GPR_ARG_REGISTERS + |--------------------------------------------| | + | TOC=R2 (AIX) Reserved (Darwin) 4/8 | | + |--------------------------------------------| | + | Reserved 2*4/8 | | + |--------------------------------------------| | + | Space for callee's LR 4/8 | | + |--------------------------------------------| | + | Saved CR [low word for m64] 4/8 | | + |--------------------------------------------| | + | Current backchain pointer 4/8 |-/ Parent's frame. + |--------------------------------------------| <+ <<< on entry to ffi_closure_ASM + | Result Bytes 16 | | + |--------------------------------------------| | + ~ padding to 16-byte alignment ~ ~ + |--------------------------------------------| | + | NUM_FPR_ARG_REGISTERS slots | | + | here fp13 .. fp1 13*8 | | + |--------------------------------------------| | + | R3..R10 8*4/8=32/64 | | NUM_GPR_ARG_REGISTERS + |--------------------------------------------| | + | TOC=R2 (AIX) Reserved (Darwin) 4/8 | | + |--------------------------------------------| | stack | + | Reserved [compiler,binder] 2*4/8 | | grows | + |--------------------------------------------| | down V + | Space for callee's LR 4/8 | | + |--------------------------------------------| | lower addresses + | Saved CR [low word for m64] 4/8 | | + |--------------------------------------------| | stack pointer here + | Current backchain pointer 4/8 |-/ during + |--------------------------------------------| <<< ffi_closure_ASM. + +*/ + +ffi_status +ffi_prep_closure_loc (ffi_closure* closure, + ffi_cif* cif, + void (*fun)(ffi_cif*, void*, void**, void*), + void *user_data, + void *codeloc) +{ + unsigned int *tramp; + struct ffi_aix_trampoline_struct *tramp_aix; + aix_fd *fd; + + switch (cif->abi) + { + case FFI_DARWIN: + + FFI_ASSERT (cif->abi == FFI_DARWIN); + + tramp = (unsigned int *) &closure->tramp[0]; +#if defined(POWERPC_DARWIN64) + tramp[0] = 0x7c0802a6; /* mflr r0 */ + tramp[1] = 0x429f0015; /* bcl- 20,4*cr7+so, +0x18 (L1) */ + /* We put the addresses here. */ + tramp[6] = 0x7d6802a6; /*L1: mflr r11 */ + tramp[7] = 0xe98b0000; /* ld r12,0(r11) function address */ + tramp[8] = 0x7c0803a6; /* mtlr r0 */ + tramp[9] = 0x7d8903a6; /* mtctr r12 */ + tramp[10] = 0xe96b0008; /* lwz r11,8(r11) static chain */ + tramp[11] = 0x4e800420; /* bctr */ + + *((unsigned long *)&tramp[2]) = (unsigned long) ffi_closure_ASM; /* function */ + *((unsigned long *)&tramp[4]) = (unsigned long) codeloc; /* context */ +#else + tramp[0] = 0x7c0802a6; /* mflr r0 */ + tramp[1] = 0x429f000d; /* bcl- 20,4*cr7+so,0x10 */ + tramp[4] = 0x7d6802a6; /* mflr r11 */ + tramp[5] = 0x818b0000; /* lwz r12,0(r11) function address */ + tramp[6] = 0x7c0803a6; /* mtlr r0 */ + tramp[7] = 0x7d8903a6; /* mtctr r12 */ + tramp[8] = 0x816b0004; /* lwz r11,4(r11) static chain */ + tramp[9] = 0x4e800420; /* bctr */ + tramp[2] = (unsigned long) ffi_closure_ASM; /* function */ + tramp[3] = (unsigned long) codeloc; /* context */ +#endif + closure->cif = cif; + closure->fun = fun; + closure->user_data = user_data; + + /* Flush the icache. Only necessary on Darwin. */ + flush_range(codeloc, FFI_TRAMPOLINE_SIZE); + + break; + + case FFI_AIX: + + tramp_aix = (struct ffi_aix_trampoline_struct *) (closure->tramp); + fd = (aix_fd *)(void *)ffi_closure_ASM; + + FFI_ASSERT (cif->abi == FFI_AIX); + + tramp_aix->code_pointer = fd->code_pointer; + tramp_aix->toc = fd->toc; + tramp_aix->static_chain = codeloc; + closure->cif = cif; + closure->fun = fun; + closure->user_data = user_data; + break; + + default: + return FFI_BAD_ABI; + break; + } + return FFI_OK; +} + +static void +flush_icache(char *addr) +{ +#ifndef _AIX + __asm__ volatile ( + "dcbf 0,%0\n" + "\tsync\n" + "\ticbi 0,%0\n" + "\tsync\n" + "\tisync" + : : "r"(addr) : "memory"); +#endif +} + +static void +flush_range(char * addr1, int size) +{ +#define MIN_LINE_SIZE 32 + int i; + for (i = 0; i < size; i += MIN_LINE_SIZE) + flush_icache(addr1+i); + flush_icache(addr1+size-1); +} + +typedef union +{ + float f; + double d; +} ffi_dblfl; + +ffi_type * +ffi_closure_helper_DARWIN (ffi_closure *, void *, + unsigned long *, ffi_dblfl *); + +/* Basically the trampoline invokes ffi_closure_ASM, and on + entry, r11 holds the address of the closure. + After storing the registers that could possibly contain + parameters to be passed into the stack frame and setting + up space for a return value, ffi_closure_ASM invokes the + following helper function to do most of the work. */ + +ffi_type * +ffi_closure_helper_DARWIN (ffi_closure *closure, void *rvalue, + unsigned long *pgr, ffi_dblfl *pfr) +{ + /* rvalue is the pointer to space for return value in closure assembly + pgr is the pointer to where r3-r10 are stored in ffi_closure_ASM + pfr is the pointer to where f1-f13 are stored in ffi_closure_ASM. */ + + typedef double ldbits[2]; + + union ldu + { + ldbits lb; + long double ld; + }; + + void ** avalue; + ffi_type ** arg_types; + long i, avn; + ffi_cif * cif; + ffi_dblfl * end_pfr = pfr + NUM_FPR_ARG_REGISTERS; + unsigned size_al; +#if defined(POWERPC_DARWIN64) + unsigned fpsused = 0; +#endif + + cif = closure->cif; + avalue = alloca (cif->nargs * sizeof(void *)); + + if (cif->rtype->type == FFI_TYPE_STRUCT) + { +#if defined(POWERPC_DARWIN64) + if (!darwin64_struct_ret_by_value_p (cif->rtype)) + { + /* Won't fit into the regs - return by ref. */ + rvalue = (void *) *pgr; + pgr++; + } +#elif defined(DARWIN_PPC) + if (cif->rtype->size > 4) + { + rvalue = (void *) *pgr; + pgr++; + } +#else /* assume we return by ref. */ + rvalue = (void *) *pgr; + pgr++; +#endif + } + + i = 0; + avn = cif->nargs; + arg_types = cif->arg_types; + + /* Grab the addresses of the arguments from the stack frame. */ + while (i < avn) + { + switch (arg_types[i]->type) + { + case FFI_TYPE_SINT8: + case FFI_TYPE_UINT8: +#if defined(POWERPC64) + avalue[i] = (char *) pgr + 7; +#else + avalue[i] = (char *) pgr + 3; +#endif + pgr++; + break; + + case FFI_TYPE_SINT16: + case FFI_TYPE_UINT16: +#if defined(POWERPC64) + avalue[i] = (char *) pgr + 6; +#else + avalue[i] = (char *) pgr + 2; +#endif + pgr++; + break; + + case FFI_TYPE_SINT32: + case FFI_TYPE_UINT32: +#if defined(POWERPC64) + avalue[i] = (char *) pgr + 4; +#else + case FFI_TYPE_POINTER: + avalue[i] = pgr; +#endif + pgr++; + break; + + case FFI_TYPE_STRUCT: + size_al = arg_types[i]->size; +#if defined(POWERPC_DARWIN64) + pgr = (unsigned long *)ALIGN((char *)pgr, arg_types[i]->alignment); + if (size_al < 3 || size_al == 4) + { + avalue[i] = ((char *)pgr)+8-size_al; + if (arg_types[i]->elements[0]->type == FFI_TYPE_FLOAT + && fpsused < NUM_FPR_ARG_REGISTERS) + { + *(float *)pgr = (float) *(double *)pfr; + pfr++; + fpsused++; + } + } + else + { + if (size_al != 16) + pfr = (ffi_dblfl *) + darwin64_struct_floats_to_mem (arg_types[i], (char *)pgr, + (double *)pfr, &fpsused); + avalue[i] = pgr; + } + pgr += (size_al + 7) / 8; +#else + /* If the first member of the struct is a double, then align + the struct to double-word. */ + if (arg_types[i]->elements[0]->type == FFI_TYPE_DOUBLE) + size_al = ALIGN(arg_types[i]->size, 8); +# if defined(POWERPC64) + FFI_ASSERT (cif->abi != FFI_DARWIN); + avalue[i] = pgr; + pgr += (size_al + 7) / 8; +# else + /* Structures that match the basic modes (QI 1 byte, HI 2 bytes, + SI 4 bytes) are aligned as if they were those modes. */ + if (size_al < 3 && cif->abi == FFI_DARWIN) + avalue[i] = (char*) pgr + 4 - size_al; + else + avalue[i] = pgr; + pgr += (size_al + 3) / 4; +# endif +#endif + break; + + case FFI_TYPE_SINT64: + case FFI_TYPE_UINT64: +#if defined(POWERPC64) + case FFI_TYPE_POINTER: + avalue[i] = pgr; + pgr++; + break; +#else + /* Long long ints are passed in two gpr's. */ + avalue[i] = pgr; + pgr += 2; + break; +#endif + + case FFI_TYPE_FLOAT: + /* A float value consumes a GPR. + There are 13 64bit floating point registers. */ + if (pfr < end_pfr) + { + double temp = pfr->d; + pfr->f = (float) temp; + avalue[i] = pfr; + pfr++; + } + else + { + avalue[i] = pgr; + } + pgr++; + break; + + case FFI_TYPE_DOUBLE: + /* A double value consumes two GPRs. + There are 13 64bit floating point registers. */ + if (pfr < end_pfr) + { + avalue[i] = pfr; + pfr++; + } + else + { + avalue[i] = pgr; + } +#ifdef POWERPC64 + pgr++; +#else + pgr += 2; +#endif + break; + +#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE + + case FFI_TYPE_LONGDOUBLE: +#ifdef POWERPC64 + if (pfr + 1 < end_pfr) + { + avalue[i] = pfr; + pfr += 2; + } + else + { + if (pfr < end_pfr) + { + *pgr = *(unsigned long *) pfr; + pfr++; + } + avalue[i] = pgr; + } + pgr += 2; +#else /* POWERPC64 */ + /* A long double value consumes four GPRs and two FPRs. + There are 13 64bit floating point registers. */ + if (pfr + 1 < end_pfr) + { + avalue[i] = pfr; + pfr += 2; + } + /* Here we have the situation where one part of the long double + is stored in fpr13 and the other part is already on the stack. + We use a union to pass the long double to avalue[i]. */ + else if (pfr + 1 == end_pfr) + { + union ldu temp_ld; + memcpy (&temp_ld.lb[0], pfr, sizeof(ldbits)); + memcpy (&temp_ld.lb[1], pgr + 2, sizeof(ldbits)); + avalue[i] = &temp_ld.ld; + pfr++; + } + else + { + avalue[i] = pgr; + } + pgr += 4; +#endif /* POWERPC64 */ + break; +#endif + default: + FFI_ASSERT(0); + } + i++; + } + + (closure->fun) (cif, rvalue, avalue, closure->user_data); + + /* Tell ffi_closure_ASM to perform return type promotions. */ + return cif->rtype; +} |