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Diffstat (limited to 'libffi/src/powerpc/ffi.c')
| -rw-r--r-- | libffi/src/powerpc/ffi.c | 423 |
1 files changed, 0 insertions, 423 deletions
diff --git a/libffi/src/powerpc/ffi.c b/libffi/src/powerpc/ffi.c deleted file mode 100644 index 6d12d653baa..00000000000 --- a/libffi/src/powerpc/ffi.c +++ /dev/null @@ -1,423 +0,0 @@ -/* ----------------------------------------------------------------------- - ffi.c - Copyright (c) 1998 Geoffrey Keating - - PowerPC Foreign Function Interface - - $Id: ffi.c,v 1.1.1.1 1998/11/29 16:48:16 green Exp $ - - 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> - -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_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 SYSV ABI. */ -enum { - NUM_GPR_ARG_REGISTERS = 8, - NUM_FPR_ARG_REGISTERS = 8 -}; -enum { ASM_NEEDS_REGISTERS = 4 }; - -/* ffi_prep_args is called by the assembly routine once stack space - has been allocated for the function's arguments. - - The stack layout we want looks like this: - - | Return address from ffi_call_SYSV 4bytes | higher addresses - |--------------------------------------------| - | Previous backchain pointer 4 | stack pointer here - |--------------------------------------------|<+ <<< on entry to - | Saved r28-r31 4*4 | | ffi_call_SYSV - |--------------------------------------------| | - | GPR registers r3-r10 8*4 | | ffi_call_SYSV - |--------------------------------------------| | - | FPR registers f1-f8 (optional) 8*8 | | - |--------------------------------------------| | stack | - | Space for copied structures | | grows | - |--------------------------------------------| | down V - | Parameters that didn't fit in registers | | - |--------------------------------------------| | lower addresses - | Space for callee's LR 4 | | - |--------------------------------------------| | stack pointer here - | Current backchain pointer 4 |-/ during - |--------------------------------------------| <<< ffi_call_SYSV - - */ - -/*@-exportheader@*/ -void ffi_prep_args(extended_cif *ecif, unsigned *const stack) -/*@=exportheader@*/ -{ - const unsigned bytes = ecif->cif->bytes; - const unsigned flags = ecif->cif->flags; - - /* 'stacktop' points at the previous backchain pointer. */ - unsigned *const stacktop = stack + (ecif->cif->bytes / sizeof(unsigned)); - - /* 'gpr_base' points at the space for gpr3, and grows upwards as - we use GPR registers. */ - unsigned *gpr_base = stacktop - ASM_NEEDS_REGISTERS - NUM_GPR_ARG_REGISTERS; - int intarg_count = 0; - - /* 'fpr_base' points at the space for fpr1, and grows upwards as - we use FPR registers. */ - double *fpr_base = (double *)gpr_base - NUM_FPR_ARG_REGISTERS; - int fparg_count = 0; - - /* 'copy_space' grows down as we put structures in it. It should - stay 16-byte aligned. */ - char *copy_space = ((flags & FLAG_FP_ARGUMENTS) - ? (char *)fpr_base - : (char *)gpr_base); - - /* 'next_arg' grows up as we put parameters in it. */ - unsigned *next_arg = stack + 2; - - int i; - ffi_type **ptr; - double double_tmp; - void **p_argv; - size_t struct_copy_size; - unsigned gprvalue; - - /* Check that everything starts aligned properly. */ - FFI_ASSERT(((unsigned)(char *)stack & 0xF) == 0); - FFI_ASSERT(((unsigned)(char *)copy_space & 0xF) == 0); - FFI_ASSERT(((unsigned)(char *)stacktop & 0xF) == 0); - FFI_ASSERT((bytes & 0xF) == 0); - FFI_ASSERT(copy_space >= (char *)next_arg); - - /* Deal with return values that are actually pass-by-reference. */ - if (flags & FLAG_RETVAL_REFERENCE) - { - *gpr_base++ = (unsigned)(char *)ecif->rvalue; - intarg_count++; - } - - /* Now for the arguments. */ - p_argv = ecif->avalue; - for (ptr = ecif->cif->arg_types, i = ecif->cif->nargs; - i > 0; - i--, ptr++, p_argv++) - { - switch ((*ptr)->type) - { - case FFI_TYPE_FLOAT: - case FFI_TYPE_DOUBLE: - if ((*ptr)->type == FFI_TYPE_FLOAT) - double_tmp = *(float *)*p_argv; - else - double_tmp = *(double *)*p_argv; - - if (fparg_count >= NUM_FPR_ARG_REGISTERS) - { - if (intarg_count%2 != 0) - { - intarg_count++; - next_arg++; - } - *(double *)next_arg = double_tmp; - next_arg += 2; - } - else - *fpr_base++ = double_tmp; - fparg_count++; - FFI_ASSERT(flags & FLAG_FP_ARGUMENTS); - break; - - case FFI_TYPE_UINT64: - case FFI_TYPE_SINT64: - if (intarg_count == NUM_GPR_ARG_REGISTERS-1) - intarg_count++; - if (intarg_count >= NUM_GPR_ARG_REGISTERS) - { - if (intarg_count%2 != 0) - { - intarg_count++; - next_arg++; - } - *(long long *)next_arg = *(long long *)*p_argv; - next_arg += 2; - } - else - { - *(long long *)gpr_base = *(long long *)*p_argv; - gpr_base += 2; - } - intarg_count += 2; - break; - - case FFI_TYPE_STRUCT: -#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE - case FFI_TYPE_LONGDOUBLE: -#endif - struct_copy_size = ((*ptr)->size + 15) & ~0xF; - copy_space -= struct_copy_size; - memcpy(copy_space, (char *)*p_argv, (*ptr)->size); - - gprvalue = (unsigned)copy_space; - - FFI_ASSERT(copy_space > (char *)next_arg); - FFI_ASSERT(flags & FLAG_ARG_NEEDS_COPY); - 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_INT: - case FFI_TYPE_UINT32: - case FFI_TYPE_SINT32: - case FFI_TYPE_POINTER: - gprvalue = *(unsigned *)*p_argv; - putgpr: - if (intarg_count >= NUM_GPR_ARG_REGISTERS) - *next_arg++ = gprvalue; - else - *gpr_base++ = gprvalue; - intarg_count++; - break; - } - } - - /* Check that we didn't overrun the stack... */ - FFI_ASSERT(copy_space >= (char *)next_arg); - 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); -} - -/* Perform machine dependent cif processing */ -ffi_status ffi_prep_cif_machdep(ffi_cif *cif) -{ - /* All this is for the SYSV ABI. */ - int i; - ffi_type **ptr; - unsigned bytes; - int fparg_count = 0, intarg_count = 0; - unsigned flags = 0; - unsigned struct_copy_size = 0; - - /* All the machine-independent calculation of cif->bytes will be wrong. - Redo the calculation for SYSV. */ - - /* Space for the frame pointer, callee's LR, and the asm's temp regs. */ - bytes = (2 + ASM_NEEDS_REGISTERS) * sizeof(int); - - /* Space for the GPR registers. */ - bytes += NUM_GPR_ARG_REGISTERS * sizeof(int); - - /* Return value handling. The rules 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; - - Larger structures and long double (if not equivalent to double) values - are allocated space and a pointer is passed as the first argument. */ - switch (cif->rtype->type) - { - 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: - flags |= FLAG_RETURNS_64BITS; - break; - - case FFI_TYPE_STRUCT: - if (cif->abi != FFI_GCC_SYSV) - if (cif->rtype->size <= 4) - break; - else if (cif->rtype->size <= 8) - { - flags |= FLAG_RETURNS_64BITS; - break; - } - /* else fall through. */ -#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE - case FFI_TYPE_LONGDOUBLE: -#endif - intarg_count++; - flags |= FLAG_RETVAL_REFERENCE; - /* Fall through. */ - 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 and long doubles (if not equivalent - to double) are passed as a pointer to a copy of the structure. - Stuff on the stack needs to keep proper alignment. */ - for (ptr = cif->arg_types, i = cif->nargs; i > 0; i--, ptr++) - { - switch ((*ptr)->type) - { - case FFI_TYPE_FLOAT: - case FFI_TYPE_DOUBLE: - fparg_count++; - /* 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++; - break; - - case FFI_TYPE_UINT64: - case FFI_TYPE_SINT64: - /* '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++; - intarg_count += 2; - break; - - case FFI_TYPE_STRUCT: -#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE - case FFI_TYPE_LONGDOUBLE: -#endif - /* We must allocate space for a copy of these to enforce - pass-by-value. Pad the space up to a multiple of 16 - bytes (the maximum alignment required for anything under - the SYSV ABI). */ - struct_copy_size += ((*ptr)->size + 15) & ~0xF; - /* Fall through (allocate space for the pointer). */ - - 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 (intarg_count > 4) - flags |= FLAG_4_GPR_ARGUMENTS; - if (struct_copy_size != 0) - flags |= FLAG_ARG_NEEDS_COPY; - - /* Space for the FPR registers, if needed. */ - if (fparg_count != 0) - bytes += NUM_FPR_ARG_REGISTERS * sizeof(double); - - /* Stack space. */ - if (intarg_count > NUM_GPR_ARG_REGISTERS) - bytes += (intarg_count - NUM_GPR_ARG_REGISTERS) * sizeof(int); - if (fparg_count > NUM_FPR_ARG_REGISTERS) - bytes += (fparg_count - NUM_FPR_ARG_REGISTERS) * sizeof(double); - - /* The stack space allocated needs to be a multiple of 16 bytes. */ - bytes = (bytes + 15) & ~0xF; - - /* Add in the space for the copied structures. */ - bytes += struct_copy_size; - - cif->flags = flags; - cif->bytes = bytes; - - return FFI_OK; -} - -/*@-declundef@*/ -/*@-exportheader@*/ -extern void ffi_call_SYSV(/*@out@*/ extended_cif *, - unsigned, unsigned, - /*@out@*/ unsigned *, - void (*fn)()); -/*@=declundef@*/ -/*@=exportheader@*/ - -void ffi_call(/*@dependent@*/ ffi_cif *cif, - void (*fn)(), - /*@out@*/ void *rvalue, - /*@dependent@*/ 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)) - { - /*@-sysunrecog@*/ - ecif.rvalue = alloca(cif->rtype->size); - /*@=sysunrecog@*/ - } - else - ecif.rvalue = rvalue; - - - switch (cif->abi) - { - case FFI_SYSV: - case FFI_GCC_SYSV: - /*@-usedef@*/ - ffi_call_SYSV(&ecif, -cif->bytes, - cif->flags, ecif.rvalue, fn); - /*@=usedef@*/ - break; - default: - FFI_ASSERT(0); - break; - } -} |