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Diffstat (limited to 'Modules/_ctypes/libffi/src/nios2/ffi.c')
| -rw-r--r-- | Modules/_ctypes/libffi/src/nios2/ffi.c | 304 |
1 files changed, 0 insertions, 304 deletions
diff --git a/Modules/_ctypes/libffi/src/nios2/ffi.c b/Modules/_ctypes/libffi/src/nios2/ffi.c deleted file mode 100644 index 2efa033f9c..0000000000 --- a/Modules/_ctypes/libffi/src/nios2/ffi.c +++ /dev/null @@ -1,304 +0,0 @@ -/* libffi support for Altera Nios II. - - Copyright (c) 2013 Mentor Graphics. - - 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> - -/* The Nios II Processor Reference Handbook defines the procedure call - ABI as follows. - - Arguments are passed as if a structure containing the types of - the arguments were constructed. The first 16 bytes are passed in r4 - through r7, the remainder on the stack. The first 16 bytes of a function - taking variable arguments are passed in r4-r7 in the same way. - - Return values of types up to 8 bytes are returned in r2 and r3. For - return values greater than 8 bytes, the caller must allocate memory for - the result and pass the address as if it were argument 0. - - While this isn't specified explicitly in the ABI documentation, GCC - promotes integral arguments smaller than int size to 32 bits. - - Also of note, the ABI specifies that all structure objects are - aligned to 32 bits even if all their fields have a smaller natural - alignment. See FFI_AGGREGATE_ALIGNMENT. */ - - -/* Declare the assembly language hooks. */ - -extern UINT64 ffi_call_sysv (void (*) (char *, extended_cif *), - extended_cif *, - unsigned, - void (*fn) (void)); -extern void ffi_closure_sysv (void); - -/* Perform machine-dependent cif processing. */ - -ffi_status ffi_prep_cif_machdep (ffi_cif *cif) -{ - /* We always want at least 16 bytes in the parameter block since it - simplifies the low-level call function. Also round the parameter - block size up to a multiple of 4 bytes to preserve - 32-bit alignment of the stack pointer. */ - if (cif->bytes < 16) - cif->bytes = 16; - else - cif->bytes = (cif->bytes + 3) & ~3; - - return FFI_OK; -} - - -/* ffi_prep_args is called by the assembly routine to transfer arguments - to the stack using the pointers in the ecif array. - Note that the stack buffer is big enough to fit all the arguments, - but the first 16 bytes will be copied to registers for the actual - call. */ - -void ffi_prep_args (char *stack, extended_cif *ecif) -{ - char *argp = stack; - unsigned int i; - - /* The implicit return value pointer is passed as if it were a hidden - first argument. */ - if (ecif->cif->rtype->type == FFI_TYPE_STRUCT - && ecif->cif->rtype->size > 8) - { - (*(void **) argp) = ecif->rvalue; - argp += 4; - } - - for (i = 0; i < ecif->cif->nargs; i++) - { - void *avalue = ecif->avalue[i]; - ffi_type *atype = ecif->cif->arg_types[i]; - size_t size = atype->size; - size_t alignment = atype->alignment; - - /* Align argp as appropriate for the argument type. */ - if ((alignment - 1) & (unsigned) argp) - argp = (char *) ALIGN (argp, alignment); - - /* Copy the argument, promoting integral types smaller than a - word to word size. */ - if (size < sizeof (int)) - { - size = sizeof (int); - switch (atype->type) - { - case FFI_TYPE_SINT8: - *(signed int *) argp = (signed int) *(SINT8 *) avalue; - break; - - case FFI_TYPE_UINT8: - *(unsigned int *) argp = (unsigned int) *(UINT8 *) avalue; - break; - - case FFI_TYPE_SINT16: - *(signed int *) argp = (signed int) *(SINT16 *) avalue; - break; - - case FFI_TYPE_UINT16: - *(unsigned int *) argp = (unsigned int) *(UINT16 *) avalue; - break; - - case FFI_TYPE_STRUCT: - memcpy (argp, avalue, atype->size); - break; - - default: - FFI_ASSERT(0); - } - } - else if (size == sizeof (int)) - *(unsigned int *) argp = (unsigned int) *(UINT32 *) avalue; - else - memcpy (argp, avalue, size); - argp += size; - } -} - - -/* Call FN using the prepared CIF. RVALUE points to space allocated by - the caller for the return value, and AVALUE is an array of argument - pointers. */ - -void ffi_call (ffi_cif *cif, void (*fn) (void), void *rvalue, void **avalue) -{ - - extended_cif ecif; - UINT64 result; - - /* If bigret is true, this is the case where a return value of larger - than 8 bytes is handled by being passed by reference as an implicit - argument. */ - int bigret = (cif->rtype->type == FFI_TYPE_STRUCT - && cif->rtype->size > 8); - - ecif.cif = cif; - ecif.avalue = avalue; - - /* Allocate space for return value if this is the pass-by-reference case - and the caller did not provide a buffer. */ - if (rvalue == NULL && bigret) - ecif.rvalue = alloca (cif->rtype->size); - else - ecif.rvalue = rvalue; - - result = ffi_call_sysv (ffi_prep_args, &ecif, cif->bytes, fn); - - /* Now result contains the 64 bit contents returned from fn in - r2 and r3. Copy the value of the appropriate size to the user-provided - rvalue buffer. */ - if (rvalue && !bigret) - switch (cif->rtype->size) - { - case 1: - *(UINT8 *)rvalue = (UINT8) result; - break; - case 2: - *(UINT16 *)rvalue = (UINT16) result; - break; - case 4: - *(UINT32 *)rvalue = (UINT32) result; - break; - case 8: - *(UINT64 *)rvalue = (UINT64) result; - break; - default: - memcpy (rvalue, (void *)&result, cif->rtype->size); - break; - } -} - -/* This function is invoked from the closure trampoline to invoke - CLOSURE with argument block ARGS. Parse ARGS according to - CLOSURE->cfi and invoke CLOSURE->fun. */ - -static UINT64 -ffi_closure_helper (unsigned char *args, - ffi_closure *closure) -{ - ffi_cif *cif = closure->cif; - unsigned char *argp = args; - void **parsed_args = alloca (cif->nargs * sizeof (void *)); - UINT64 result; - void *retptr; - unsigned int i; - - /* First figure out what to do about the return type. If this is the - big-structure-return case, the first arg is the hidden return buffer - allocated by the caller. */ - if (cif->rtype->type == FFI_TYPE_STRUCT - && cif->rtype->size > 8) - { - retptr = *((void **) argp); - argp += 4; - } - else - retptr = (void *) &result; - - /* Fill in the array of argument pointers. */ - for (i = 0; i < cif->nargs; i++) - { - size_t size = cif->arg_types[i]->size; - size_t alignment = cif->arg_types[i]->alignment; - - /* Align argp as appropriate for the argument type. */ - if ((alignment - 1) & (unsigned) argp) - argp = (char *) ALIGN (argp, alignment); - - /* Arguments smaller than an int are promoted to int. */ - if (size < sizeof (int)) - size = sizeof (int); - - /* Store the pointer. */ - parsed_args[i] = argp; - argp += size; - } - - /* Call the user-supplied function. */ - (closure->fun) (cif, retptr, parsed_args, closure->user_data); - return result; -} - - -/* Initialize CLOSURE with a trampoline to call FUN with - CIF and USER_DATA. */ -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 = (unsigned int *) &closure->tramp[0]; - int i; - - if (cif->abi != FFI_SYSV) - return FFI_BAD_ABI; - - /* The trampoline looks like: - movhi r8, %hi(ffi_closure_sysv) - ori r8, r8, %lo(ffi_closure_sysv) - movhi r9, %hi(ffi_closure_helper) - ori r0, r9, %lo(ffi_closure_helper) - movhi r10, %hi(closure) - ori r10, r10, %lo(closure) - jmp r8 - and then ffi_closure_sysv retrieves the closure pointer out of r10 - in addition to the arguments passed in the normal way for the call, - and invokes ffi_closure_helper. We encode the pointer to - ffi_closure_helper in the trampoline because making a PIC call - to it in ffi_closure_sysv would be messy (it would have to indirect - through the GOT). */ - -#define HI(x) ((((unsigned int) (x)) >> 16) & 0xffff) -#define LO(x) (((unsigned int) (x)) & 0xffff) - tramp[0] = (0 << 27) | (8 << 22) | (HI (ffi_closure_sysv) << 6) | 0x34; - tramp[1] = (8 << 27) | (8 << 22) | (LO (ffi_closure_sysv) << 6) | 0x14; - tramp[2] = (0 << 27) | (9 << 22) | (HI (ffi_closure_helper) << 6) | 0x34; - tramp[3] = (9 << 27) | (9 << 22) | (LO (ffi_closure_helper) << 6) | 0x14; - tramp[4] = (0 << 27) | (10 << 22) | (HI (closure) << 6) | 0x34; - tramp[5] = (10 << 27) | (10 << 22) | (LO (closure) << 6) | 0x14; - tramp[6] = (8 << 27) | (0x0d << 11) | 0x3a; -#undef HI -#undef LO - - /* Flush the caches. - See Example 9-4 in the Nios II Software Developer's Handbook. */ - for (i = 0; i < 7; i++) - asm volatile ("flushd 0(%0); flushi %0" :: "r"(tramp + i) : "memory"); - asm volatile ("flushp" ::: "memory"); - - closure->cif = cif; - closure->fun = fun; - closure->user_data = user_data; - - return FFI_OK; -} - |