+++ /dev/null
-/* 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 *) FFI_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 *) FFI_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;
-}
-
+++ /dev/null
-/* libffi target includes 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. */
-
-
-#ifndef LIBFFI_TARGET_H
-#define LIBFFI_TARGET_H
-
-#ifndef LIBFFI_H
-#error "Please do not include ffitarget.h directly into your source. Use ffi.h instead."
-#endif
-
-#ifndef LIBFFI_ASM
-typedef unsigned long ffi_arg;
-typedef signed long ffi_sarg;
-
-typedef enum ffi_abi {
- FFI_FIRST_ABI = 0,
- FFI_SYSV,
- FFI_LAST_ABI,
- FFI_DEFAULT_ABI = FFI_SYSV
-} ffi_abi;
-#endif
-
-/* Structures have a 4-byte alignment even if all the fields have lesser
- alignment requirements. */
-#define FFI_AGGREGATE_ALIGNMENT 4
-
-#define FFI_CLOSURES 1
-#define FFI_TRAMPOLINE_SIZE 28 /* 7 instructions */
-#define FFI_NATIVE_RAW_API 0
-
-#endif
+++ /dev/null
-/* Low-level 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. */
-
-/* This function is declared on the C side as
-
- extern UINT64 ffi_call_sysv (void (*arghook) (char *, extended_cif *),
- extended_cif *ecif,
- unsigned nbytes,
- void (*fn) (void));
-
- On input, the arguments appear as
- r4 = arghook
- r5 = ecif
- r6 = nbytes
- r7 = fn
-*/
-
- .section .text
- .align 2
- .global ffi_call_sysv
- .type ffi_call_sysv, @function
-
-ffi_call_sysv:
- .cfi_startproc
-
- /* Create the stack frame, saving r16 so we can use it locally. */
- addi sp, sp, -12
- .cfi_def_cfa_offset 12
- stw ra, 8(sp)
- stw fp, 4(sp)
- stw r16, 0(sp)
- .cfi_offset 31, -4
- .cfi_offset 28, -8
- .cfi_offset 16, -12
- mov fp, sp
- .cfi_def_cfa_register 28
- mov r16, r7
-
- /* Adjust the stack pointer to create the argument buffer
- nbytes long. */
- sub sp, sp, r6
-
- /* Call the arghook function. */
- mov r2, r4 /* fn */
- mov r4, sp /* argbuffer */
- callr r2 /* r5 already contains ecif */
-
- /* Pop off the first 16 bytes of the argument buffer on the stack,
- transferring the contents to the argument registers. */
- ldw r4, 0(sp)
- ldw r5, 4(sp)
- ldw r6, 8(sp)
- ldw r7, 12(sp)
- addi sp, sp, 16
-
- /* Call the user function, which leaves its result in r2 and r3. */
- callr r16
-
- /* Pop off the stack frame. */
- mov sp, fp
- ldw ra, 8(sp)
- ldw fp, 4(sp)
- ldw r16, 0(sp)
- addi sp, sp, 12
- ret
- .cfi_endproc
- .size ffi_call_sysv, .-ffi_call_sysv
-
-
-/* Closure trampolines jump here after putting the C helper address
- in r9 and the closure pointer in r10. The user-supplied arguments
- to the closure are in the normal places, in r4-r7 and on the
- stack. Push the register arguments on the stack too and then call the
- C helper function to deal with them. */
-
- .section .text
- .align 2
- .global ffi_closure_sysv
- .type ffi_closure_sysv, @function
-
-ffi_closure_sysv:
- .cfi_startproc
-
- /* Create the stack frame, pushing the register args on the stack
- just below the stack args. This is the same trick illustrated
- in Figure 7-3 in the Nios II Processor Reference Handbook, used
- for variable arguments and structures passed by value. */
- addi sp, sp, -20
- .cfi_def_cfa_offset 20
- stw ra, 0(sp)
- .cfi_offset 31, -20
- stw r4, 4(sp)
- .cfi_offset 4, -16
- stw r5, 8(sp)
- .cfi_offset 5, -12
- stw r6, 12(sp)
- .cfi_offset 6, -8
- stw r7, 16(sp)
- .cfi_offset 7, -4
-
- /* Call the helper.
- r4 = pointer to arguments on stack
- r5 = closure pointer (loaded in r10 by the trampoline)
- r9 = address of helper function (loaded by trampoline) */
- addi r4, sp, 4
- mov r5, r10
- callr r9
-
- /* Pop the stack and return. */
- ldw ra, 0(sp)
- addi sp, sp, 20
- .cfi_def_cfa_offset -20
- ret
- .cfi_endproc
- .size ffi_closure_sysv, .-ffi_closure_sysv
-
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