diff options
Diffstat (limited to 'libffi/src/powerpc/ffi_darwin.c')
| -rw-r--r-- | libffi/src/powerpc/ffi_darwin.c | 767 |
1 files changed, 599 insertions, 168 deletions
diff --git a/libffi/src/powerpc/ffi_darwin.c b/libffi/src/powerpc/ffi_darwin.c index 82265e832b4..ee03dab6989 100644 --- a/libffi/src/powerpc/ffi_darwin.c +++ b/libffi/src/powerpc/ffi_darwin.c @@ -3,7 +3,7 @@ Copyright (C) 1998 Geoffrey Keating Copyright (C) 2001 John Hornkvist - Copyright (C) 2002, 2006, 2007, 2009 Free Software Foundation, Inc. + Copyright (C) 2002, 2006, 2007, 2009, 2010 Free Software Foundation, Inc. FFI support for Darwin and AIX. @@ -35,11 +35,17 @@ extern void ffi_closure_ASM (void); enum { - /* The assembly depends on these exact flags. */ - FLAG_RETURNS_NOTHING = 1 << (31-30), /* These go in cr7 */ - FLAG_RETURNS_FP = 1 << (31-29), - FLAG_RETURNS_64BITS = 1 << (31-28), - FLAG_RETURNS_128BITS = 1 << (31-31), + /* 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 */ @@ -50,43 +56,61 @@ enum { /* About the DARWIN ABI. */ enum { NUM_GPR_ARG_REGISTERS = 8, - NUM_FPR_ARG_REGISTERS = 13 + NUM_FPR_ARG_REGISTERS = 13, + LINKAGE_AREA_GPRS = 6 }; -enum { ASM_NEEDS_REGISTERS = 4 }; + +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 | stack pointer here + | Previous backchain pointer 4/8 | stack pointer here |--------------------------------------------|<+ <<< on entry to - | Saved r28-r31 4*4 | | ffi_call_DARWIN + | ASM_NEEDS_REGISTERS=r28-r31 4*(4/8) | | ffi_call_DARWIN |--------------------------------------------| | - | Parameters (at least 8*4=32) | | + | 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 |--------------------------------------------| | - | Space for GPR2 4 | | + | TOC=R2 (AIX) Reserved (Darwin) 4/8 | | |--------------------------------------------| | stack | - | Reserved 2*4 | | grows | + | Reserved 2*4/8 | | grows | |--------------------------------------------| | down V - | Space for callee's LR 4 | | + | Space for callee's LR 4/8 | | |--------------------------------------------| | lower addresses - | Saved CR 4 | | + | Saved CR [low word for m64] 4/8 | | |--------------------------------------------| | stack pointer here - | Current backchain pointer 4 |-/ during + | 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)); @@ -94,18 +118,19 @@ ffi_prep_args (extended_cif *ecif, unsigned long *const stack) /* '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 fparg_count = 0; - + int gp_count = 0, fparg_count = 0; /* 'next_arg' grows up as we put parameters in it. */ - unsigned long *next_arg = stack + 6; /* 6 reserved positions. */ + 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. */ @@ -130,25 +155,30 @@ ffi_prep_args (extended_cif *ecif, unsigned long *const stack) 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) - *(double *)next_arg = double_tmp; - else + 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) - *(double *)next_arg = double_tmp; - else + 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); @@ -157,30 +187,41 @@ ffi_prep_args (extended_cif *ecif, unsigned long *const stack) #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE case FFI_TYPE_LONGDOUBLE: -#ifdef POWERPC64 +# 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 +# else double_tmp = ((double *) *p_argv)[0]; if (fparg_count < NUM_FPR_ARG_REGISTERS) *fpr_base++ = double_tmp; - else - *(double *) next_arg = 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; - else - *(double *) next_arg = 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 +# endif FFI_ASSERT(flags & FLAG_FP_ARGUMENTS); break; #endif @@ -192,6 +233,7 @@ ffi_prep_args (extended_cif *ecif, unsigned long *const stack) #else *(long long *) next_arg = *(long long *) *p_argv; next_arg += 2; + gp_count += 2; #endif break; case FFI_TYPE_POINTER: @@ -211,32 +253,35 @@ ffi_prep_args (extended_cif *ecif, unsigned long *const stack) goto putgpr; case FFI_TYPE_STRUCT: -#ifdef POWERPC64 - dest_cpy = (char *) next_arg; size_al = (*ptr)->size; - if ((*ptr)->elements[0]->type == 3) +#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 (size_al < 3 && abi == FFI_DARWIN) - dest_cpy += 4 - size_al; +# if defined(POWERPC64) + FFI_ASSERT (abi != FFI_DARWIN); memcpy ((char *) dest_cpy, (char *) *p_argv, size_al); next_arg += (size_al + 7) / 8; -#else - dest_cpy = (char *) next_arg; - +# 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. */ - size_al = (*ptr)->size; - /* 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); 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; @@ -249,6 +294,7 @@ ffi_prep_args (extended_cif *ecif, unsigned long *const stack) gprvalue = *(unsigned int *) *p_argv; putgpr: *next_arg++ = gprvalue; + gp_count++; break; default: break; @@ -262,8 +308,269 @@ ffi_prep_args (extended_cif *ecif, unsigned long *const stack) //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, the first field of a structure has natural alignment. */ + 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) @@ -280,22 +587,29 @@ darwin_adjust_aggregate_sizes (ffi_type *s) int align; p = s->elements[i]; - darwin_adjust_aggregate_sizes (p); - if (i == 0 - && (p->type == FFI_TYPE_UINT64 - || p->type == FFI_TYPE_SINT64 - || p->type == FFI_TYPE_DOUBLE - || p->alignment == 8)) - align = 8; + 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 @@ -347,7 +661,7 @@ ffi_prep_cif_machdep (ffi_cif *cif) unsigned i; ffi_type **ptr; unsigned bytes; - int fparg_count = 0, intarg_count = 0; + unsigned fparg_count = 0, intarg_count = 0; unsigned flags = 0; unsigned size_al = 0; @@ -372,16 +686,25 @@ ffi_prep_cif_machdep (ffi_cif *cif) /* Space for the frame pointer, callee's LR, CR, etc, and for the asm's temp regs. */ - bytes = (6 + ASM_NEEDS_REGISTERS) * sizeof(long); + bytes = (LINKAGE_AREA_GPRS + ASM_NEEDS_REGISTERS) * sizeof(unsigned long); - /* Return value handling. The rules are as follows: + /* 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; + - 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) @@ -410,9 +733,42 @@ ffi_prep_cif_machdep (ffi_cif *cif) 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; @@ -425,57 +781,83 @@ ffi_prep_cif_machdep (ffi_cif *cif) /* 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. */ + 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%2 != 0) + && (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 - 8-byte-aligned. */ - if (fparg_count > NUM_FPR_ARG_REGISTERS - && intarg_count%2 != 0) - intarg_count++; - intarg_count +=2; + 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%2 != 0)) + || (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. */ + the struct to double-word. if ((*ptr)->elements[0]->type == FFI_TYPE_DOUBLE) - size_al = ALIGN((*ptr)->size, 8); -#ifdef POWERPC64 + size_al = ALIGN((*ptr)->size, 8); */ +# ifdef POWERPC64 intarg_count += (size_al + 7) / 8; -#else +# else intarg_count += (size_al + 3) / 4; +# endif #endif break; @@ -490,9 +872,18 @@ ffi_prep_cif_machdep (ffi_cif *cif) 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 @@ -506,7 +897,7 @@ ffi_prep_cif_machdep (ffi_cif *cif) bytes += NUM_GPR_ARG_REGISTERS * sizeof(long); /* The stack space allocated needs to be a multiple of 16 bytes. */ - bytes = (bytes + 15) & ~0xF; + bytes = ALIGN(bytes, 16) ; cif->flags = flags; cif->bytes = bytes; @@ -516,8 +907,9 @@ ffi_prep_cif_machdep (ffi_cif *cif) 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)); + void (*fn)(void), void (*fn2)(void), ffi_type*); void ffi_call (ffi_cif *cif, void (*fn)(void), void *rvalue, void **avalue) @@ -546,7 +938,7 @@ ffi_call (ffi_cif *cif, void (*fn)(void), void *rvalue, void **avalue) break; case FFI_DARWIN: ffi_call_DARWIN(&ecif, -(long)cif->bytes, cif->flags, ecif.rvalue, fn, - FFI_FN(ffi_prep_args)); + FFI_FN(ffi_prep_args), cif->rtype); break; default: FFI_ASSERT(0); @@ -566,58 +958,48 @@ typedef struct aix_fd_struct { } aix_fd; /* here I'd like to add the stack frame layout we use in darwin_closure.S - and aix_clsoure.S - - SP previous -> +---------------------------------------+ <--- child frame - | back chain to caller 4 | - +---------------------------------------+ 4 - | saved CR 4 | - +---------------------------------------+ 8 - | saved LR 4 | - +---------------------------------------+ 12 - | reserved for compilers 4 | - +---------------------------------------+ 16 - | reserved for binders 4 | - +---------------------------------------+ 20 - | saved TOC pointer 4 | - +---------------------------------------+ 24 - | always reserved 8*4=32 (previous GPRs)| - | according to the linkage convention | - | from AIX | - +---------------------------------------+ 56 - | our FPR area 13*8=104 | - | f1 | - | . | - | f13 | - +---------------------------------------+ 160 - | result area 8 | - +---------------------------------------+ 168 - | alignement to the next multiple of 16 | -SP current --> +---------------------------------------+ 176 <- parent frame - | back chain to caller 4 | - +---------------------------------------+ 180 - | saved CR 4 | - +---------------------------------------+ 184 - | saved LR 4 | - +---------------------------------------+ 188 - | reserved for compilers 4 | - +---------------------------------------+ 192 - | reserved for binders 4 | - +---------------------------------------+ 196 - | saved TOC pointer 4 | - +---------------------------------------+ 200 - | always reserved 8*4=32 we store our | - | GPRs here | - | r3 | - | . | - | r10 | - +---------------------------------------+ 232 - | overflow part | - +---------------------------------------+ xxx - | ???? | - +---------------------------------------+ xxx + 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, @@ -631,30 +1013,44 @@ ffi_prep_closure_loc (ffi_closure* closure, switch (cif->abi) { - case FFI_DARWIN: - - FFI_ASSERT (cif->abi == FFI_DARWIN); - - tramp = (unsigned int *) &closure->tramp[0]; - 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 */ - - closure->cif = cif; - closure->fun = fun; - closure->user_data = user_data; + 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); + /* Flush the icache. Only necessary on Darwin. */ + flush_range(codeloc, FFI_TRAMPOLINE_SIZE); - break; + break; case FFI_AIX: @@ -708,7 +1104,7 @@ typedef union double d; } ffi_dblfl; -int +ffi_type * ffi_closure_helper_DARWIN (ffi_closure *, void *, unsigned long *, ffi_dblfl *); @@ -719,7 +1115,7 @@ ffi_closure_helper_DARWIN (ffi_closure *, void *, up space for a return value, ffi_closure_ASM invokes the following helper function to do most of the work. */ -int +ffi_type * ffi_closure_helper_DARWIN (ffi_closure *closure, void *rvalue, unsigned long *pgr, ffi_dblfl *pfr) { @@ -741,16 +1137,32 @@ ffi_closure_helper_DARWIN (ffi_closure *closure, void *rvalue, 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 *)); - /* Copy the caller's structure return value address so that the closure - returns the data directly to the caller. */ 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; @@ -764,7 +1176,7 @@ ffi_closure_helper_DARWIN (ffi_closure *closure, void *rvalue, { case FFI_TYPE_SINT8: case FFI_TYPE_UINT8: -#ifdef POWERPC64 +#if defined(POWERPC64) avalue[i] = (char *) pgr + 7; #else avalue[i] = (char *) pgr + 3; @@ -774,7 +1186,7 @@ ffi_closure_helper_DARWIN (ffi_closure *closure, void *rvalue, case FFI_TYPE_SINT16: case FFI_TYPE_UINT16: -#ifdef POWERPC64 +#if defined(POWERPC64) avalue[i] = (char *) pgr + 6; #else avalue[i] = (char *) pgr + 2; @@ -784,7 +1196,7 @@ ffi_closure_helper_DARWIN (ffi_closure *closure, void *rvalue, case FFI_TYPE_SINT32: case FFI_TYPE_UINT32: -#ifdef POWERPC64 +#if defined(POWERPC64) avalue[i] = (char *) pgr + 4; #else case FFI_TYPE_POINTER: @@ -794,34 +1206,53 @@ ffi_closure_helper_DARWIN (ffi_closure *closure, void *rvalue, break; case FFI_TYPE_STRUCT: -#ifdef POWERPC64 size_al = arg_types[i]->size; - if (arg_types[i]->elements[0]->type == FFI_TYPE_DOUBLE) - size_al = ALIGN (arg_types[i]->size, 8); - if (size_al < 3 && cif->abi == FFI_DARWIN) - avalue[i] = (char *) pgr + 8 - size_al; - else - avalue[i] = pgr; +#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 - /* Structures that match the basic modes (QI 1 byte, HI 2 bytes, - SI 4 bytes) are aligned as if they were those modes. */ - size_al = arg_types[i]->size; /* 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: -#ifdef POWERPC64 +#if defined(POWERPC64) case FFI_TYPE_POINTER: avalue[i] = pgr; pgr++; @@ -924,5 +1355,5 @@ ffi_closure_helper_DARWIN (ffi_closure *closure, void *rvalue, (closure->fun) (cif, rvalue, avalue, closure->user_data); /* Tell ffi_closure_ASM to perform return type promotions. */ - return cif->rtype->type; + return cif->rtype; } |