diff options
Diffstat (limited to 'gcc-4.4.0/libffi/src/arm/ffi.c')
-rw-r--r-- | gcc-4.4.0/libffi/src/arm/ffi.c | 308 |
1 files changed, 308 insertions, 0 deletions
diff --git a/gcc-4.4.0/libffi/src/arm/ffi.c b/gcc-4.4.0/libffi/src/arm/ffi.c new file mode 100644 index 000000000..35b2c3477 --- /dev/null +++ b/gcc-4.4.0/libffi/src/arm/ffi.c @@ -0,0 +1,308 @@ +/* ----------------------------------------------------------------------- + ffi.c - Copyright (c) 1998 Red Hat, Inc. + + ARM Foreign Function Interface + + 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 CYGNUS SOLUTIONS 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> + +/* ffi_prep_args is called by the assembly routine once stack space + has been allocated for the function's arguments */ + +void ffi_prep_args(char *stack, extended_cif *ecif) +{ + register unsigned int i; + register void **p_argv; + register char *argp; + register ffi_type **p_arg; + + argp = stack; + + if ( ecif->cif->flags == FFI_TYPE_STRUCT ) { + *(void **) argp = ecif->rvalue; + argp += 4; + } + + p_argv = ecif->avalue; + + for (i = ecif->cif->nargs, p_arg = ecif->cif->arg_types; + (i != 0); + i--, p_arg++) + { + size_t z; + + /* Align if necessary */ + if (((*p_arg)->alignment - 1) & (unsigned) argp) { + argp = (char *) ALIGN(argp, (*p_arg)->alignment); + } + + if ((*p_arg)->type == FFI_TYPE_STRUCT) + argp = (char *) ALIGN(argp, 4); + + z = (*p_arg)->size; + if (z < sizeof(int)) + { + z = sizeof(int); + switch ((*p_arg)->type) + { + case FFI_TYPE_SINT8: + *(signed int *) argp = (signed int)*(SINT8 *)(* p_argv); + break; + + case FFI_TYPE_UINT8: + *(unsigned int *) argp = (unsigned int)*(UINT8 *)(* p_argv); + break; + + case FFI_TYPE_SINT16: + *(signed int *) argp = (signed int)*(SINT16 *)(* p_argv); + break; + + case FFI_TYPE_UINT16: + *(unsigned int *) argp = (unsigned int)*(UINT16 *)(* p_argv); + break; + + case FFI_TYPE_STRUCT: + memcpy(argp, *p_argv, (*p_arg)->size); + break; + + default: + FFI_ASSERT(0); + } + } + else if (z == sizeof(int)) + { + *(unsigned int *) argp = (unsigned int)*(UINT32 *)(* p_argv); + } + else + { + memcpy(argp, *p_argv, z); + } + p_argv++; + argp += z; + } + + return; +} + +/* Perform machine dependent cif processing */ +ffi_status ffi_prep_cif_machdep(ffi_cif *cif) +{ + /* Round the stack up to a multiple of 8 bytes. This isn't needed + everywhere, but it is on some platforms, and it doesn't harm anything + when it isn't needed. */ + cif->bytes = (cif->bytes + 7) & ~7; + + /* Set the return type flag */ + switch (cif->rtype->type) + { + case FFI_TYPE_VOID: + case FFI_TYPE_FLOAT: + case FFI_TYPE_DOUBLE: + cif->flags = (unsigned) cif->rtype->type; + break; + + case FFI_TYPE_SINT64: + case FFI_TYPE_UINT64: + cif->flags = (unsigned) FFI_TYPE_SINT64; + break; + + case FFI_TYPE_STRUCT: + if (cif->rtype->size <= 4) + /* A Composite Type not larger than 4 bytes is returned in r0. */ + cif->flags = (unsigned)FFI_TYPE_INT; + else + /* A Composite Type larger than 4 bytes, or whose size cannot + be determined statically ... is stored in memory at an + address passed [in r0]. */ + cif->flags = (unsigned)FFI_TYPE_STRUCT; + break; + + default: + cif->flags = FFI_TYPE_INT; + break; + } + + return FFI_OK; +} + +extern void ffi_call_SYSV(void (*)(char *, extended_cif *), extended_cif *, + unsigned, unsigned, unsigned *, void (*fn)()); + +void ffi_call(ffi_cif *cif, void (*fn)(), void *rvalue, void **avalue) +{ + extended_cif ecif; + + int small_struct = (cif->flags == FFI_TYPE_INT + && cif->rtype->type == FFI_TYPE_STRUCT); + + ecif.cif = cif; + ecif.avalue = avalue; + + unsigned int temp; + + /* 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->flags == FFI_TYPE_STRUCT)) + { + ecif.rvalue = alloca(cif->rtype->size); + } + else if (small_struct) + ecif.rvalue = &temp; + else + ecif.rvalue = rvalue; + + switch (cif->abi) + { + case FFI_SYSV: + ffi_call_SYSV(ffi_prep_args, &ecif, cif->bytes, cif->flags, ecif.rvalue, + fn); + + break; + default: + FFI_ASSERT(0); + break; + } + if (small_struct) + memcpy (rvalue, &temp, cif->rtype->size); +} + +/** private members **/ + +static void ffi_prep_incoming_args_SYSV (char *stack, void **ret, + void** args, ffi_cif* cif); + +void ffi_closure_SYSV (ffi_closure *); + +/* This function is jumped to by the trampoline */ + +unsigned int +ffi_closure_SYSV_inner (closure, respp, args) + ffi_closure *closure; + void **respp; + void *args; +{ + // our various things... + ffi_cif *cif; + void **arg_area; + + cif = closure->cif; + arg_area = (void**) alloca (cif->nargs * sizeof (void*)); + + /* this call will initialize ARG_AREA, such that each + * element in that array points to the corresponding + * value on the stack; and if the function returns + * a structure, it will re-set RESP to point to the + * structure return address. */ + + ffi_prep_incoming_args_SYSV(args, respp, arg_area, cif); + + (closure->fun) (cif, *respp, arg_area, closure->user_data); + + return cif->flags; +} + +/*@-exportheader@*/ +static void +ffi_prep_incoming_args_SYSV(char *stack, void **rvalue, + void **avalue, ffi_cif *cif) +/*@=exportheader@*/ +{ + register unsigned int i; + register void **p_argv; + register char *argp; + register ffi_type **p_arg; + + argp = stack; + + if ( cif->flags == FFI_TYPE_STRUCT ) { + *rvalue = *(void **) argp; + argp += 4; + } + + p_argv = avalue; + + for (i = cif->nargs, p_arg = cif->arg_types; (i != 0); i--, p_arg++) + { + size_t z; + + size_t alignment = (*p_arg)->alignment; + if (alignment < 4) + alignment = 4; + /* Align if necessary */ + if ((alignment - 1) & (unsigned) argp) { + argp = (char *) ALIGN(argp, alignment); + } + + z = (*p_arg)->size; + + /* because we're little endian, this is what it turns into. */ + + *p_argv = (void*) argp; + + p_argv++; + argp += z; + } + + return; +} + +/* How to make a trampoline. */ + +#define FFI_INIT_TRAMPOLINE(TRAMP,FUN,CTX) \ +({ unsigned char *__tramp = (unsigned char*)(TRAMP); \ + unsigned int __fun = (unsigned int)(FUN); \ + unsigned int __ctx = (unsigned int)(CTX); \ + *(unsigned int*) &__tramp[0] = 0xe92d000f; /* stmfd sp!, {r0-r3} */ \ + *(unsigned int*) &__tramp[4] = 0xe59f0000; /* ldr r0, [pc] */ \ + *(unsigned int*) &__tramp[8] = 0xe59ff000; /* ldr pc, [pc] */ \ + *(unsigned int*) &__tramp[12] = __ctx; \ + *(unsigned int*) &__tramp[16] = __fun; \ + __clear_cache((&__tramp[0]), (&__tramp[19])); \ + }) + + +/* the cif must already be prep'ed */ + +ffi_status +ffi_prep_closure_loc (ffi_closure* closure, + ffi_cif* cif, + void (*fun)(ffi_cif*,void*,void**,void*), + void *user_data, + void *codeloc) +{ + FFI_ASSERT (cif->abi == FFI_SYSV); + + FFI_INIT_TRAMPOLINE (&closure->tramp[0], \ + &ffi_closure_SYSV, \ + codeloc); + + closure->cif = cif; + closure->user_data = user_data; + closure->fun = fun; + + return FFI_OK; +} |