diff options
Diffstat (limited to 'ext/ffi_c/libffi/src/vax/ffi.c')
| -rw-r--r-- | ext/ffi_c/libffi/src/vax/ffi.c | 276 |
1 files changed, 276 insertions, 0 deletions
diff --git a/ext/ffi_c/libffi/src/vax/ffi.c b/ext/ffi_c/libffi/src/vax/ffi.c new file mode 100644 index 0000000..f4d6bbb --- /dev/null +++ b/ext/ffi_c/libffi/src/vax/ffi.c @@ -0,0 +1,276 @@ +/* + * Copyright (c) 2013 Miodrag Vallat. <miod@openbsd.org> + * + * 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 AUTHORS OR COPYRIGHT HOLDERS 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. + */ + +/* + * vax Foreign Function Interface + * + * This file attempts to provide all the FFI entry points which can reliably + * be implemented in C. + */ + +#include <ffi.h> +#include <ffi_common.h> + +#include <stdlib.h> +#include <unistd.h> + +#define CIF_FLAGS_CHAR 1 /* for struct only */ +#define CIF_FLAGS_SHORT 2 /* for struct only */ +#define CIF_FLAGS_INT 4 +#define CIF_FLAGS_DINT 8 + +/* + * Foreign Function Interface API + */ + +void ffi_call_elfbsd (extended_cif *, unsigned, unsigned, void *, + void (*) ()); +void *ffi_prep_args (extended_cif *ecif, void *stack); + +void * +ffi_prep_args (extended_cif *ecif, void *stack) +{ + unsigned int i; + void **p_argv; + char *argp; + ffi_type **p_arg; + void *struct_value_ptr; + + argp = stack; + + if (ecif->cif->rtype->type == FFI_TYPE_STRUCT + && !ecif->cif->flags) + struct_value_ptr = ecif->rvalue; + else + struct_value_ptr = NULL; + + p_argv = ecif->avalue; + + for (i = ecif->cif->nargs, p_arg = ecif->cif->arg_types; + i != 0; + i--, p_arg++) + { + size_t z; + + z = (*p_arg)->size; + if (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, z); + break; + + default: + FFI_ASSERT (0); + } + z = sizeof (int); + } + else + { + memcpy (argp, *p_argv, z); + + /* Align if necessary. */ + if ((sizeof(int) - 1) & z) + z = ALIGN(z, sizeof(int)); + } + + p_argv++; + argp += z; + } + + return struct_value_ptr; +} + +ffi_status +ffi_prep_cif_machdep (ffi_cif *cif) +{ + /* Set the return type flag */ + switch (cif->rtype->type) + { + case FFI_TYPE_VOID: + cif->flags = 0; + break; + + case FFI_TYPE_STRUCT: + if (cif->rtype->elements[0]->type == FFI_TYPE_STRUCT && + cif->rtype->elements[1]) + { + cif->flags = 0; + break; + } + + if (cif->rtype->size == sizeof (char)) + cif->flags = CIF_FLAGS_CHAR; + else if (cif->rtype->size == sizeof (short)) + cif->flags = CIF_FLAGS_SHORT; + else if (cif->rtype->size == sizeof (int)) + cif->flags = CIF_FLAGS_INT; + else if (cif->rtype->size == 2 * sizeof (int)) + cif->flags = CIF_FLAGS_DINT; + else + cif->flags = 0; + break; + + default: + if (cif->rtype->size <= sizeof (int)) + cif->flags = CIF_FLAGS_INT; + else + cif->flags = CIF_FLAGS_DINT; + break; + } + + return FFI_OK; +} + +void +ffi_call (ffi_cif *cif, void (*fn) (), 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 + && cif->flags == 0) + ecif.rvalue = alloca (cif->rtype->size); + else + ecif.rvalue = rvalue; + + switch (cif->abi) + { + case FFI_ELFBSD: + ffi_call_elfbsd (&ecif, cif->bytes, cif->flags, ecif.rvalue, fn); + break; + + default: + FFI_ASSERT (0); + break; + } +} + +/* + * Closure API + */ + +void ffi_closure_elfbsd (void); +void ffi_closure_struct_elfbsd (void); +unsigned int ffi_closure_elfbsd_inner (ffi_closure *, void *, char *); + +static void +ffi_prep_closure_elfbsd (ffi_cif *cif, void **avalue, char *stackp) +{ + unsigned int i; + void **p_argv; + ffi_type **p_arg; + + p_argv = avalue; + + for (i = cif->nargs, p_arg = cif->arg_types; i != 0; i--, p_arg++) + { + size_t z; + + z = (*p_arg)->size; + *p_argv = stackp; + + /* Align if necessary */ + if ((sizeof (int) - 1) & z) + z = ALIGN(z, sizeof (int)); + + p_argv++; + stackp += z; + } +} + +unsigned int +ffi_closure_elfbsd_inner (ffi_closure *closure, void *resp, char *stack) +{ + ffi_cif *cif; + void **arg_area; + + cif = closure->cif; + arg_area = (void **) alloca (cif->nargs * sizeof (void *)); + + ffi_prep_closure_elfbsd (cif, arg_area, stack); + + (closure->fun) (cif, resp, arg_area, closure->user_data); + + return cif->flags; +} + +ffi_status +ffi_prep_closure_loc (ffi_closure *closure, ffi_cif *cif, + void (*fun)(ffi_cif *, void *, void **, void *), + void *user_data, void *codeloc) +{ + char *tramp = (char *) codeloc; + void *fn; + + FFI_ASSERT (cif->abi == FFI_ELFBSD); + + /* entry mask */ + *(unsigned short *)(tramp + 0) = 0x0000; + /* movl #closure, r0 */ + tramp[2] = 0xd0; + tramp[3] = 0x8f; + *(unsigned int *)(tramp + 4) = (unsigned int) closure; + tramp[8] = 0x50; + + if (cif->rtype->type == FFI_TYPE_STRUCT + && !cif->flags) + fn = &ffi_closure_struct_elfbsd; + else + fn = &ffi_closure_elfbsd; + + /* jmpl #fn */ + tramp[9] = 0x17; + tramp[10] = 0xef; + *(unsigned int *)(tramp + 11) = (unsigned int)fn + 2 - + (unsigned int)tramp - 9 - 6; + + closure->cif = cif; + closure->user_data = user_data; + closure->fun = fun; + + return FFI_OK; +} |