| /* ----------------------------------------------------------------------- |
| ffi.c - Copyright (c) 2012 Anthony Green |
| Copyright (c) 1998, 2001, 2007, 2008 Red Hat, Inc. |
| |
| Alpha 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 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. |
| ----------------------------------------------------------------------- */ |
| |
| #include <ffi.h> |
| #include <ffi_common.h> |
| #include <stdlib.h> |
| |
| /* Force FFI_TYPE_LONGDOUBLE to be different than FFI_TYPE_DOUBLE; |
| all further uses in this file will refer to the 128-bit type. */ |
| #if defined(__LONG_DOUBLE_128__) |
| # if FFI_TYPE_LONGDOUBLE != 4 |
| # error FFI_TYPE_LONGDOUBLE out of date |
| # endif |
| #else |
| # undef FFI_TYPE_LONGDOUBLE |
| # define FFI_TYPE_LONGDOUBLE 4 |
| #endif |
| |
| extern void ffi_call_osf(void *, unsigned long, unsigned, void *, void (*)(void)) |
| FFI_HIDDEN; |
| extern void ffi_closure_osf(void) FFI_HIDDEN; |
| |
| |
| ffi_status |
| ffi_prep_cif_machdep(ffi_cif *cif) |
| { |
| /* Adjust cif->bytes to represent a minimum 6 words for the temporary |
| register argument loading area. */ |
| if (cif->bytes < 6*FFI_SIZEOF_ARG) |
| cif->bytes = 6*FFI_SIZEOF_ARG; |
| |
| /* Set the return type flag */ |
| switch (cif->rtype->type) |
| { |
| case FFI_TYPE_STRUCT: |
| case FFI_TYPE_FLOAT: |
| case FFI_TYPE_DOUBLE: |
| cif->flags = cif->rtype->type; |
| break; |
| |
| case FFI_TYPE_LONGDOUBLE: |
| /* 128-bit long double is returned in memory, like a struct. */ |
| cif->flags = FFI_TYPE_STRUCT; |
| break; |
| |
| default: |
| cif->flags = FFI_TYPE_INT; |
| break; |
| } |
| |
| return FFI_OK; |
| } |
| |
| |
| void |
| ffi_call(ffi_cif *cif, void (*fn)(void), void *rvalue, void **avalue) |
| { |
| unsigned long *stack, *argp; |
| long i, avn; |
| ffi_type **arg_types; |
| |
| /* 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) |
| rvalue = alloca(cif->rtype->size); |
| |
| /* Allocate the space for the arguments, plus 4 words of temp |
| space for ffi_call_osf. */ |
| argp = stack = alloca(cif->bytes + 4*FFI_SIZEOF_ARG); |
| |
| if (cif->flags == FFI_TYPE_STRUCT) |
| *(void **) argp++ = rvalue; |
| |
| i = 0; |
| avn = cif->nargs; |
| arg_types = cif->arg_types; |
| |
| while (i < avn) |
| { |
| size_t size = (*arg_types)->size; |
| |
| switch ((*arg_types)->type) |
| { |
| case FFI_TYPE_SINT8: |
| *(SINT64 *) argp = *(SINT8 *)(* avalue); |
| break; |
| |
| case FFI_TYPE_UINT8: |
| *(SINT64 *) argp = *(UINT8 *)(* avalue); |
| break; |
| |
| case FFI_TYPE_SINT16: |
| *(SINT64 *) argp = *(SINT16 *)(* avalue); |
| break; |
| |
| case FFI_TYPE_UINT16: |
| *(SINT64 *) argp = *(UINT16 *)(* avalue); |
| break; |
| |
| case FFI_TYPE_SINT32: |
| case FFI_TYPE_UINT32: |
| /* Note that unsigned 32-bit quantities are sign extended. */ |
| *(SINT64 *) argp = *(SINT32 *)(* avalue); |
| break; |
| |
| case FFI_TYPE_SINT64: |
| case FFI_TYPE_UINT64: |
| case FFI_TYPE_POINTER: |
| *(UINT64 *) argp = *(UINT64 *)(* avalue); |
| break; |
| |
| case FFI_TYPE_FLOAT: |
| if (argp - stack < 6) |
| { |
| /* Note the conversion -- all the fp regs are loaded as |
| doubles. The in-register format is the same. */ |
| *(double *) argp = *(float *)(* avalue); |
| } |
| else |
| *(float *) argp = *(float *)(* avalue); |
| break; |
| |
| case FFI_TYPE_DOUBLE: |
| *(double *) argp = *(double *)(* avalue); |
| break; |
| |
| case FFI_TYPE_LONGDOUBLE: |
| /* 128-bit long double is passed by reference. */ |
| *(long double **) argp = (long double *)(* avalue); |
| size = sizeof (long double *); |
| break; |
| |
| case FFI_TYPE_STRUCT: |
| memcpy(argp, *avalue, (*arg_types)->size); |
| break; |
| |
| default: |
| FFI_ASSERT(0); |
| } |
| |
| argp += ALIGN(size, FFI_SIZEOF_ARG) / FFI_SIZEOF_ARG; |
| i++, arg_types++, avalue++; |
| } |
| |
| ffi_call_osf(stack, cif->bytes, cif->flags, rvalue, fn); |
| } |
| |
| |
| 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; |
| |
| if (cif->abi != FFI_OSF) |
| return FFI_BAD_ABI; |
| |
| tramp = (unsigned int *) &closure->tramp[0]; |
| tramp[0] = 0x47fb0401; /* mov $27,$1 */ |
| tramp[1] = 0xa77b0010; /* ldq $27,16($27) */ |
| tramp[2] = 0x6bfb0000; /* jmp $31,($27),0 */ |
| tramp[3] = 0x47ff041f; /* nop */ |
| *(void **) &tramp[4] = ffi_closure_osf; |
| |
| closure->cif = cif; |
| closure->fun = fun; |
| closure->user_data = user_data; |
| |
| /* Flush the Icache. |
| |
| Tru64 UNIX as doesn't understand the imb mnemonic, so use call_pal |
| instead, since both Compaq as and gas can handle it. |
| |
| 0x86 is PAL_imb in Tru64 UNIX <alpha/pal.h>. */ |
| asm volatile ("call_pal 0x86" : : : "memory"); |
| |
| return FFI_OK; |
| } |
| |
| |
| long FFI_HIDDEN |
| ffi_closure_osf_inner(ffi_closure *closure, void *rvalue, unsigned long *argp) |
| { |
| ffi_cif *cif; |
| void **avalue; |
| ffi_type **arg_types; |
| long i, avn, argn; |
| |
| cif = closure->cif; |
| avalue = alloca(cif->nargs * sizeof(void *)); |
| |
| argn = 0; |
| |
| /* Copy the caller's structure return address to that the closure |
| returns the data directly to the caller. */ |
| if (cif->flags == FFI_TYPE_STRUCT) |
| { |
| rvalue = (void *) argp[0]; |
| argn = 1; |
| } |
| |
| i = 0; |
| avn = cif->nargs; |
| arg_types = cif->arg_types; |
| |
| /* Grab the addresses of the arguments from the stack frame. */ |
| while (i < avn) |
| { |
| size_t size = arg_types[i]->size; |
| |
| switch (arg_types[i]->type) |
| { |
| case FFI_TYPE_SINT8: |
| case FFI_TYPE_UINT8: |
| case FFI_TYPE_SINT16: |
| case FFI_TYPE_UINT16: |
| case FFI_TYPE_SINT32: |
| case FFI_TYPE_UINT32: |
| case FFI_TYPE_SINT64: |
| case FFI_TYPE_UINT64: |
| case FFI_TYPE_POINTER: |
| case FFI_TYPE_STRUCT: |
| avalue[i] = &argp[argn]; |
| break; |
| |
| case FFI_TYPE_FLOAT: |
| if (argn < 6) |
| { |
| /* Floats coming from registers need conversion from double |
| back to float format. */ |
| *(float *)&argp[argn - 6] = *(double *)&argp[argn - 6]; |
| avalue[i] = &argp[argn - 6]; |
| } |
| else |
| avalue[i] = &argp[argn]; |
| break; |
| |
| case FFI_TYPE_DOUBLE: |
| avalue[i] = &argp[argn - (argn < 6 ? 6 : 0)]; |
| break; |
| |
| case FFI_TYPE_LONGDOUBLE: |
| /* 128-bit long double is passed by reference. */ |
| avalue[i] = (long double *) argp[argn]; |
| size = sizeof (long double *); |
| break; |
| |
| default: |
| abort (); |
| } |
| |
| argn += ALIGN(size, FFI_SIZEOF_ARG) / FFI_SIZEOF_ARG; |
| i++; |
| } |
| |
| /* Invoke the closure. */ |
| closure->fun (cif, rvalue, avalue, closure->user_data); |
| |
| /* Tell ffi_closure_osf how to perform return type promotions. */ |
| return cif->rtype->type; |
| } |