| /* ----------------------------------------------------------------------- |
| 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> |
| #include "internal.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| # error FFI_TYPE_LONGDOUBLE out of date |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 *stack, void *frame, unsigned flags, |
| void *raddr, void (*fn)(void), void *closure) |
| FFI_HIDDEN; |
| extern void ffi_closure_osf(void) FFI_HIDDEN; |
| extern void ffi_go_closure_osf(void) FFI_HIDDEN; |
| |
| /* Promote a float value to its in-register double representation. |
| Unlike actually casting to double, this does not trap on NaN. */ |
| static inline UINT64 lds(void *ptr) |
| { |
| UINT64 ret; |
| asm("lds %0,%1" : "=f"(ret) : "m"(*(UINT32 *)ptr)); |
| return ret; |
| } |
| |
| /* And the reverse. */ |
| static inline void sts(void *ptr, UINT64 val) |
| { |
| asm("sts %1,%0" : "=m"(*(UINT32 *)ptr) : "f"(val)); |
| } |
| |
| ffi_status FFI_HIDDEN |
| ffi_prep_cif_machdep(ffi_cif *cif) |
| { |
| size_t bytes = 0; |
| int flags, i, avn; |
| ffi_type *rtype, *itype; |
| |
| if (cif->abi != FFI_OSF) |
| return FFI_BAD_ABI; |
| |
| /* Compute the size of the argument area. */ |
| for (i = 0, avn = cif->nargs; i < avn; i++) |
| { |
| itype = cif->arg_types[i]; |
| switch (itype->type) |
| { |
| case FFI_TYPE_INT: |
| 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_FLOAT: |
| case FFI_TYPE_DOUBLE: |
| case FFI_TYPE_LONGDOUBLE: |
| /* All take one 8 byte slot. */ |
| bytes += 8; |
| break; |
| |
| case FFI_TYPE_VOID: |
| case FFI_TYPE_STRUCT: |
| /* Passed by value in N slots. */ |
| bytes += ALIGN(itype->size, FFI_SIZEOF_ARG); |
| break; |
| |
| case FFI_TYPE_COMPLEX: |
| /* _Complex long double passed by reference; others in 2 slots. */ |
| if (itype->elements[0]->type == FFI_TYPE_LONGDOUBLE) |
| bytes += 8; |
| else |
| bytes += 16; |
| break; |
| |
| default: |
| abort(); |
| } |
| } |
| |
| /* Set the return type flag */ |
| rtype = cif->rtype; |
| switch (rtype->type) |
| { |
| case FFI_TYPE_VOID: |
| flags = ALPHA_FLAGS(ALPHA_ST_VOID, ALPHA_LD_VOID); |
| break; |
| case FFI_TYPE_INT: |
| case FFI_TYPE_UINT32: |
| case FFI_TYPE_SINT32: |
| flags = ALPHA_FLAGS(ALPHA_ST_INT, ALPHA_LD_INT32); |
| break; |
| case FFI_TYPE_FLOAT: |
| flags = ALPHA_FLAGS(ALPHA_ST_FLOAT, ALPHA_LD_FLOAT); |
| break; |
| case FFI_TYPE_DOUBLE: |
| flags = ALPHA_FLAGS(ALPHA_ST_DOUBLE, ALPHA_LD_DOUBLE); |
| break; |
| case FFI_TYPE_UINT8: |
| flags = ALPHA_FLAGS(ALPHA_ST_INT, ALPHA_LD_UINT8); |
| break; |
| case FFI_TYPE_SINT8: |
| flags = ALPHA_FLAGS(ALPHA_ST_INT, ALPHA_LD_SINT8); |
| break; |
| case FFI_TYPE_UINT16: |
| flags = ALPHA_FLAGS(ALPHA_ST_INT, ALPHA_LD_UINT16); |
| break; |
| case FFI_TYPE_SINT16: |
| flags = ALPHA_FLAGS(ALPHA_ST_INT, ALPHA_LD_SINT16); |
| break; |
| case FFI_TYPE_UINT64: |
| case FFI_TYPE_SINT64: |
| case FFI_TYPE_POINTER: |
| flags = ALPHA_FLAGS(ALPHA_ST_INT, ALPHA_LD_INT64); |
| break; |
| case FFI_TYPE_LONGDOUBLE: |
| case FFI_TYPE_STRUCT: |
| /* Passed in memory, with a hidden pointer. */ |
| flags = ALPHA_RET_IN_MEM; |
| break; |
| case FFI_TYPE_COMPLEX: |
| itype = rtype->elements[0]; |
| switch (itype->type) |
| { |
| case FFI_TYPE_FLOAT: |
| flags = ALPHA_FLAGS(ALPHA_ST_CPLXF, ALPHA_LD_CPLXF); |
| break; |
| case FFI_TYPE_DOUBLE: |
| flags = ALPHA_FLAGS(ALPHA_ST_CPLXD, ALPHA_LD_CPLXD); |
| break; |
| default: |
| if (rtype->size <= 8) |
| flags = ALPHA_FLAGS(ALPHA_ST_INT, ALPHA_LD_INT64); |
| else |
| flags = ALPHA_RET_IN_MEM; |
| break; |
| } |
| break; |
| default: |
| abort(); |
| } |
| cif->flags = flags; |
| |
| /* Include the hidden structure pointer in args requirement. */ |
| if (flags == ALPHA_RET_IN_MEM) |
| bytes += 8; |
| /* Minimum size is 6 slots, so that ffi_call_osf can pop them. */ |
| if (bytes < 6*8) |
| bytes = 6*8; |
| cif->bytes = bytes; |
| |
| return FFI_OK; |
| } |
| |
| static unsigned long |
| extend_basic_type(void *valp, int type, int argn) |
| { |
| switch (type) |
| { |
| case FFI_TYPE_SINT8: |
| return *(SINT8 *)valp; |
| case FFI_TYPE_UINT8: |
| return *(UINT8 *)valp; |
| case FFI_TYPE_SINT16: |
| return *(SINT16 *)valp; |
| case FFI_TYPE_UINT16: |
| return *(UINT16 *)valp; |
| |
| case FFI_TYPE_FLOAT: |
| if (argn < 6) |
| return lds(valp); |
| /* FALLTHRU */ |
| |
| case FFI_TYPE_INT: |
| case FFI_TYPE_SINT32: |
| case FFI_TYPE_UINT32: |
| /* Note that unsigned 32-bit quantities are sign extended. */ |
| return *(SINT32 *)valp; |
| |
| case FFI_TYPE_SINT64: |
| case FFI_TYPE_UINT64: |
| case FFI_TYPE_POINTER: |
| case FFI_TYPE_DOUBLE: |
| return *(UINT64 *)valp; |
| |
| default: |
| abort(); |
| } |
| } |
| |
| static void |
| ffi_call_int (ffi_cif *cif, void (*fn)(void), void *rvalue, |
| void **avalue, void *closure) |
| { |
| unsigned long *argp; |
| long i, avn, argn, flags = cif->flags; |
| ffi_type **arg_types; |
| void *frame; |
| |
| /* 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 && flags == ALPHA_RET_IN_MEM) |
| rvalue = alloca(cif->rtype->size); |
| |
| /* Allocate the space for the arguments, plus 4 words of temp |
| space for ffi_call_osf. */ |
| argp = frame = alloca(cif->bytes + 4*FFI_SIZEOF_ARG); |
| frame += cif->bytes; |
| |
| argn = 0; |
| if (flags == ALPHA_RET_IN_MEM) |
| argp[argn++] = (unsigned long)rvalue; |
| |
| avn = cif->nargs; |
| arg_types = cif->arg_types; |
| |
| for (i = 0, avn = cif->nargs; i < avn; i++) |
| { |
| ffi_type *ty = arg_types[i]; |
| void *valp = avalue[i]; |
| int type = ty->type; |
| size_t size; |
| |
| switch (type) |
| { |
| case FFI_TYPE_INT: |
| 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_FLOAT: |
| case FFI_TYPE_DOUBLE: |
| argp[argn] = extend_basic_type(valp, type, argn); |
| argn++; |
| break; |
| |
| case FFI_TYPE_LONGDOUBLE: |
| by_reference: |
| /* Note that 128-bit long double is passed by reference. */ |
| argp[argn++] = (unsigned long)valp; |
| break; |
| |
| case FFI_TYPE_VOID: |
| case FFI_TYPE_STRUCT: |
| size = ty->size; |
| memcpy(argp + argn, valp, size); |
| argn += ALIGN(size, FFI_SIZEOF_ARG) / FFI_SIZEOF_ARG; |
| break; |
| |
| case FFI_TYPE_COMPLEX: |
| type = ty->elements[0]->type; |
| if (type == FFI_TYPE_LONGDOUBLE) |
| goto by_reference; |
| |
| /* Most complex types passed as two separate arguments. */ |
| size = ty->elements[0]->size; |
| argp[argn] = extend_basic_type(valp, type, argn); |
| argp[argn + 1] = extend_basic_type(valp + size, type, argn + 1); |
| argn += 2; |
| break; |
| |
| default: |
| abort(); |
| } |
| } |
| |
| flags = (flags >> ALPHA_ST_SHIFT) & 0xff; |
| ffi_call_osf(argp, frame, flags, rvalue, fn, closure); |
| } |
| |
| void |
| ffi_call (ffi_cif *cif, void (*fn)(void), void *rvalue, void **avalue) |
| { |
| ffi_call_int(cif, fn, rvalue, avalue, NULL); |
| } |
| |
| void |
| ffi_call_go (ffi_cif *cif, void (*fn)(void), void *rvalue, |
| void **avalue, void *closure) |
| { |
| ffi_call_int(cif, fn, rvalue, avalue, closure); |
| } |
| |
| 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; |
| } |
| |
| ffi_status |
| ffi_prep_go_closure (ffi_go_closure* closure, |
| ffi_cif* cif, |
| void (*fun)(ffi_cif*, void*, void**, void*)) |
| { |
| if (cif->abi != FFI_OSF) |
| return FFI_BAD_ABI; |
| |
| closure->tramp = (void *)ffi_go_closure_osf; |
| closure->cif = cif; |
| closure->fun = fun; |
| |
| return FFI_OK; |
| } |
| |
| long FFI_HIDDEN |
| ffi_closure_osf_inner (ffi_cif *cif, |
| void (*fun)(ffi_cif*, void*, void**, void*), |
| void *user_data, |
| void *rvalue, unsigned long *argp) |
| { |
| void **avalue; |
| ffi_type **arg_types; |
| long i, avn, argn, flags; |
| |
| avalue = alloca(cif->nargs * sizeof(void *)); |
| flags = cif->flags; |
| argn = 0; |
| |
| /* Copy the caller's structure return address to that the closure |
| returns the data directly to the caller. */ |
| if (flags == ALPHA_RET_IN_MEM) |
| { |
| rvalue = (void *) argp[0]; |
| argn = 1; |
| } |
| |
| arg_types = cif->arg_types; |
| |
| /* Grab the addresses of the arguments from the stack frame. */ |
| for (i = 0, avn = cif->nargs; i < avn; i++) |
| { |
| ffi_type *ty = arg_types[i]; |
| int type = ty->type; |
| void *valp = &argp[argn]; |
| size_t size; |
| |
| switch (type) |
| { |
| case FFI_TYPE_INT: |
| 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: |
| argn += 1; |
| break; |
| |
| case FFI_TYPE_VOID: |
| case FFI_TYPE_STRUCT: |
| size = ty->size; |
| argn += ALIGN(size, FFI_SIZEOF_ARG) / FFI_SIZEOF_ARG; |
| break; |
| |
| case FFI_TYPE_FLOAT: |
| /* Floats coming from registers need conversion from double |
| back to float format. */ |
| if (argn < 6) |
| { |
| valp = &argp[argn - 6]; |
| sts(valp, argp[argn - 6]); |
| } |
| argn += 1; |
| break; |
| |
| case FFI_TYPE_DOUBLE: |
| if (argn < 6) |
| valp = &argp[argn - 6]; |
| argn += 1; |
| break; |
| |
| case FFI_TYPE_LONGDOUBLE: |
| by_reference: |
| /* 128-bit long double is passed by reference. */ |
| valp = (void *)argp[argn]; |
| argn += 1; |
| break; |
| |
| case FFI_TYPE_COMPLEX: |
| type = ty->elements[0]->type; |
| switch (type) |
| { |
| case FFI_TYPE_SINT64: |
| case FFI_TYPE_UINT64: |
| /* Passed as separate arguments, but they wind up sequential. */ |
| break; |
| |
| case FFI_TYPE_INT: |
| case FFI_TYPE_SINT8: |
| case FFI_TYPE_UINT8: |
| case FFI_TYPE_SINT16: |
| case FFI_TYPE_UINT16: |
| case FFI_TYPE_SINT32: |
| case FFI_TYPE_UINT32: |
| /* Passed as separate arguments. Disjoint, but there's room |
| enough in one slot to hold the pair. */ |
| size = ty->elements[0]->size; |
| memcpy(valp + size, valp + 8, size); |
| break; |
| |
| case FFI_TYPE_FLOAT: |
| /* Passed as separate arguments. Disjoint, and each piece |
| may need conversion back to float. */ |
| if (argn < 6) |
| { |
| valp = &argp[argn - 6]; |
| sts(valp, argp[argn - 6]); |
| } |
| if (argn + 1 < 6) |
| sts(valp + 4, argp[argn + 1 - 6]); |
| else |
| *(UINT32 *)(valp + 4) = argp[argn + 1]; |
| break; |
| |
| case FFI_TYPE_DOUBLE: |
| /* Passed as separate arguments. Only disjoint if one part |
| is in fp regs and the other is on the stack. */ |
| if (argn < 5) |
| valp = &argp[argn - 6]; |
| else if (argn == 5) |
| { |
| valp = alloca(16); |
| ((UINT64 *)valp)[0] = argp[5 - 6]; |
| ((UINT64 *)valp)[1] = argp[6]; |
| } |
| break; |
| |
| case FFI_TYPE_LONGDOUBLE: |
| goto by_reference; |
| |
| default: |
| abort(); |
| } |
| argn += 2; |
| break; |
| |
| default: |
| abort (); |
| } |
| |
| avalue[i] = valp; |
| } |
| |
| /* Invoke the closure. */ |
| fun (cif, rvalue, avalue, user_data); |
| |
| /* Tell ffi_closure_osf how to perform return type promotions. */ |
| return (flags >> ALPHA_LD_SHIFT) & 0xff; |
| } |