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Xtensa support

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This commit is contained in:
Anthony Green
2013-01-21 07:07:38 -05:00
parent 9742f91782
commit 20cae32b15
11 changed files with 689 additions and 13 deletions
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8
src/prep_cif.c
View File

@@ -143,6 +143,10 @@ ffi_status FFI_HIDDEN ffi_prep_cif_core(ffi_cif *cif, ffi_abi abi,
#ifdef TILE
&& (cif->rtype->size > 10 * FFI_SIZEOF_ARG)
#endif
#ifdef XTENSA
&& (cif->rtype->size > 16)
#endif
)
bytes = STACK_ARG_SIZE(sizeof(void*));
#endif
@@ -181,6 +185,10 @@ ffi_status FFI_HIDDEN ffi_prep_cif_core(ffi_cif *cif, ffi_abi abi,
bytes = 10 * FFI_SIZEOF_ARG;
}
#endif
#ifdef XTENSA
if (bytes <= 6*4 && bytes + STACK_ARG_SIZE((*ptr)->size) > 6*4)
bytes = 6*4;
#endif
bytes += STACK_ARG_SIZE((*ptr)->size);
}

298
src/xtensa/ffi.c Normal file
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@@ -0,0 +1,298 @@
/* -----------------------------------------------------------------------
ffi.c - Copyright (c) 2013 Tensilica, Inc.
XTENSA 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>
/*
|----------------------------------------|
| |
on entry to ffi_call ----> |----------------------------------------|
| caller stack frame for registers a0-a3 |
|----------------------------------------|
| |
| additional arguments |
entry of the function ---> |----------------------------------------|
| copy of function arguments a2-a7 |
| - - - - - - - - - - - - - |
| |
The area below the entry line becomes the new stack frame for the function.
*/
#define FFI_TYPE_STRUCT_REGS FFI_TYPE_LAST
extern void ffi_call_SYSV(void *rvalue, unsigned rsize, unsigned flags,
void(*fn)(void), unsigned nbytes, extended_cif*);
extern void ffi_closure_SYSV(void) FFI_HIDDEN;
ffi_status ffi_prep_cif_machdep(ffi_cif *cif)
{
switch(cif->rtype->type) {
case FFI_TYPE_SINT8:
case FFI_TYPE_UINT8:
case FFI_TYPE_SINT16:
case FFI_TYPE_UINT16:
cif->flags = cif->rtype->type;
break;
case FFI_TYPE_VOID:
case FFI_TYPE_FLOAT:
cif->flags = FFI_TYPE_UINT32;
break;
case FFI_TYPE_DOUBLE:
case FFI_TYPE_UINT64:
case FFI_TYPE_SINT64:
cif->flags = FFI_TYPE_UINT64; // cif->rtype->type;
break;
case FFI_TYPE_STRUCT:
cif->flags = FFI_TYPE_STRUCT; //_REGS;
/* Up to 16 bytes are returned in registers */
if (cif->rtype->size > 4 * 4) {
/* returned structure is referenced by a register; use 8 bytes
(including 4 bytes for potential additional alignment) */
cif->flags = FFI_TYPE_STRUCT;
cif->bytes += 8;
}
break;
default:
cif->flags = FFI_TYPE_UINT32;
break;
}
/* Round the stack up to a full 4 register frame, just in case
(we use this size in movsp). This way, it's also a multiple of
8 bytes for 64-bit arguments. */
cif->bytes = ALIGN(cif->bytes, 16);
return FFI_OK;
}
void ffi_prep_args(extended_cif *ecif, unsigned char* stack)
{
unsigned int i;
unsigned long *addr;
ffi_type **ptr;
union {
void **v;
char **c;
signed char **sc;
unsigned char **uc;
signed short **ss;
unsigned short **us;
unsigned int **i;
long long **ll;
float **f;
double **d;
} p_argv;
/* Verify that everything is aligned up properly */
FFI_ASSERT (((unsigned long) stack & 0x7) == 0);
p_argv.v = ecif->avalue;
addr = (unsigned long*)stack;
/* structures with a size greater than 16 bytes are passed in memory */
if (ecif->cif->rtype->type == FFI_TYPE_STRUCT && ecif->cif->rtype->size > 16)
{
*addr++ = (unsigned long)ecif->rvalue;
}
for (i = ecif->cif->nargs, ptr = ecif->cif->arg_types;
i > 0;
i--, ptr++, p_argv.v++)
{
switch ((*ptr)->type)
{
case FFI_TYPE_SINT8:
*addr++ = **p_argv.sc;
break;
case FFI_TYPE_UINT8:
*addr++ = **p_argv.uc;
break;
case FFI_TYPE_SINT16:
*addr++ = **p_argv.ss;
break;
case FFI_TYPE_UINT16:
*addr++ = **p_argv.us;
break;
case FFI_TYPE_FLOAT:
case FFI_TYPE_INT:
case FFI_TYPE_UINT32:
case FFI_TYPE_SINT32:
case FFI_TYPE_POINTER:
*addr++ = **p_argv.i;
break;
case FFI_TYPE_DOUBLE:
case FFI_TYPE_UINT64:
case FFI_TYPE_SINT64:
if (((unsigned long)addr & 4) != 0)
addr++;
*(unsigned long long*)addr = **p_argv.ll;
addr += sizeof(unsigned long long) / sizeof (addr);
break;
case FFI_TYPE_STRUCT:
{
unsigned long offs;
unsigned long size;
if (((unsigned long)addr & 4) != 0 && (*ptr)->alignment > 4)
addr++;
offs = (unsigned long) addr - (unsigned long) stack;
size = (*ptr)->size;
/* Entire structure must fit the argument registers or referenced */
if (offs < FFI_REGISTER_NARGS * 4
&& offs + size > FFI_REGISTER_NARGS * 4)
addr = (unsigned long*) (stack + FFI_REGISTER_NARGS * 4);
memcpy((char*) addr, *p_argv.c, size);
addr += (size + 3) / 4;
break;
}
default:
FFI_ASSERT(0);
}
}
}
void ffi_call(ffi_cif* cif, void(*fn)(void), void *rvalue, void **avalue)
{
extended_cif ecif;
unsigned long rsize = cif->rtype->size;
int flags = cif->flags;
void *alloc = NULL;
ecif.cif = cif;
ecif.avalue = avalue;
/* Note that for structures that are returned in registers (size <= 16 bytes)
we allocate a temporary buffer and use memcpy to copy it to the final
destination. The reason is that the target address might be misaligned or
the length not a multiple of 4 bytes. Handling all those cases would be
very complex. */
if (flags == FFI_TYPE_STRUCT && (rsize <= 16 || rvalue == NULL))
{
alloc = alloca(ALIGN(rsize, 4));
ecif.rvalue = alloc;
}
else
{
ecif.rvalue = rvalue;
}
if (cif->abi != FFI_SYSV)
FFI_ASSERT(0);
ffi_call_SYSV (ecif.rvalue, rsize, cif->flags, fn, cif->bytes, &ecif);
if (alloc != NULL && rvalue != NULL)
memcpy(rvalue, alloc, rsize);
}
extern void ffi_trampoline();
extern void ffi_cacheflush(void* start, void* end);
ffi_status
ffi_prep_closure_loc (ffi_closure* closure,
ffi_cif* cif,
void (*fun)(ffi_cif*, void*, void**, void*),
void *user_data,
void *codeloc)
{
/* copye trampoline to stack and patch 'ffi_closure_SYSV' pointer */
memcpy(closure->tramp, ffi_trampoline, FFI_TRAMPOLINE_SIZE);
*(unsigned int*)(&closure->tramp[8]) = (unsigned int)ffi_closure_SYSV;
// Do we have this function?
// __builtin___clear_cache(closer->tramp, closer->tramp + FFI_TRAMPOLINE_SIZE)
ffi_cacheflush(closure->tramp, closure->tramp + FFI_TRAMPOLINE_SIZE);
closure->cif = cif;
closure->fun = fun;
closure->user_data = user_data;
return FFI_OK;
}
long FFI_HIDDEN
ffi_closure_SYSV_inner(ffi_closure *closure, void **values, void *rvalue)
{
ffi_cif *cif;
ffi_type **arg_types;
void **avalue;
int i, areg;
cif = closure->cif;
if (cif->abi != FFI_SYSV)
return FFI_BAD_ABI;
areg = 0;
int rtype = cif->rtype->type;
if (rtype == FFI_TYPE_STRUCT && cif->rtype->size > 4 * 4)
{
rvalue = *values;
areg++;
}
cif = closure->cif;
arg_types = cif->arg_types;
avalue = alloca(cif->nargs * sizeof(void *));
for (i = 0; i < cif->nargs; i++)
{
if (arg_types[i]->alignment == 8 && (areg & 1) != 0)
areg++;
// skip the entry 16,a1 framework, add 16 bytes (4 registers)
if (areg == FFI_REGISTER_NARGS)
areg += 4;
if (arg_types[i]->type == FFI_TYPE_STRUCT)
{
int numregs = ((arg_types[i]->size + 3) & ~3) / 4;
if (areg < FFI_REGISTER_NARGS && areg + numregs > FFI_REGISTER_NARGS)
areg = FFI_REGISTER_NARGS + 4;
}
avalue[i] = &values[areg];
areg += (arg_types[i]->size + 3) / 4;
}
(closure->fun)(cif, rvalue, avalue, closure->user_data);
return rtype;
}

53
src/xtensa/ffitarget.h Normal file
View File

@@ -0,0 +1,53 @@
/* -----------------------------------------------------------------*-C-*-
ffitarget.h - Copyright (c) 2013 Tensilica, Inc.
Target configuration macros for XTENSA.
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
#define FFI_REGISTER_NARGS 6
/* ---- Definitions for closures ----------------------------------------- */
#define FFI_CLOSURES 1
#define FFI_NATIVE_RAW_API 0
#define FFI_TRAMPOLINE_SIZE 24
#endif

253
src/xtensa/sysv.S Normal file
View File

@@ -0,0 +1,253 @@
/* -----------------------------------------------------------------------
sysv.S - Copyright (c) 2013 Tensilica, Inc.
XTENSA 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.
----------------------------------------------------------------------- */
#define LIBFFI_ASM
#include <fficonfig.h>
#include <ffi.h>
#define ENTRY(name) .text; .globl name; .type name,@function; .align 4; name:
#define END(name) .size name , . - name
/* Assert that the table below is in sync with ffi.h. */
#if FFI_TYPE_UINT8 != 5 \
|| FFI_TYPE_SINT8 != 6 \
|| FFI_TYPE_UINT16 != 7 \
|| FFI_TYPE_SINT16 != 8 \
|| FFI_TYPE_UINT32 != 9 \
|| FFI_TYPE_SINT32 != 10 \
|| FFI_TYPE_UINT64 != 11
#error "xtensa/sysv.S out of sync with ffi.h"
#endif
/* ffi_call_SYSV (rvalue, rbytes, flags, (*fnaddr)(), bytes, ecif)
void *rvalue; a2
unsigned long rbytes; a3
unsigned flags; a4
void (*fnaddr)(); a5
unsigned long bytes; a6
extended_cif* ecif) a7
*/
ENTRY(ffi_call_SYSV)
entry a1, 32 # 32 byte frame for using call8 below
mov a10, a7 # a10(->arg0): ecif
sub a11, a1, a6 # a11(->arg1): stack pointer
mov a7, a1 # fp
movsp a1, a11 # set new sp = old_sp - bytes
movi a8, ffi_prep_args
callx8 a8 # ffi_prep_args(ecif, stack)
# prepare to move stack pointer back up to 6 arguments
# note that 'bytes' is already aligned
movi a10, 6*4
sub a11, a6, a10
movgez a6, a10, a11
add a6, a1, a6
# we can pass up to 6 arguments in registers
# for simplicity, just load 6 arguments
# (the stack size is at least 32 bytes, so no risk to cross boundaries)
l32i a10, a1, 0
l32i a11, a1, 4
l32i a12, a1, 8
l32i a13, a1, 12
l32i a14, a1, 16
l32i a15, a1, 20
# move stack pointer
movsp a1, a6
callx8 a5 # (*fn)(args...)
# Handle return value(s)
beqz a2, .Lexit
movi a5, FFI_TYPE_STRUCT
bne a4, a5, .Lstore
movi a5, 16
blt a5, a3, .Lexit
s32i a10, a2, 0
blti a3, 5, .Lexit
addi a3, a3, -1
s32i a11, a2, 4
blti a3, 8, .Lexit
s32i a12, a2, 8
blti a3, 12, .Lexit
s32i a13, a2, 12
.Lexit: retw
.Lstore:
addi a4, a4, -FFI_TYPE_UINT8
bgei a4, 7, .Lexit # should never happen
movi a6, store_calls
add a4, a4, a4
addx4 a6, a4, a6 # store_table + idx * 8
jx a6
.align 8
store_calls:
# UINT8
s8i a10, a2, 0
retw
# SINT8
.align 8
s8i a10, a2, 0
retw
# UINT16
.align 8
s16i a10, a2, 0
retw
# SINT16
.align 8
s16i a10, a2, 0
retw
# UINT32
.align 8
s32i a10, a2, 0
retw
# SINT32
.align 8
s32i a10, a2, 0
retw
# UINT64
.align 8
s32i a10, a2, 0
s32i a11, a2, 4
retw
END(ffi_call_SYSV)
/*
* void ffi_cacheflush (unsigned long start, unsigned long end)
*/
#define EXTRA_ARGS_SIZE 24
ENTRY(ffi_cacheflush)
entry a1, 16
1: dhwbi a2, 0
ihi a2, 0
addi a2, a2, 4
blt a2, a3, 1b
retw
END(ffi_cacheflush)
/* ffi_trampoline is copied to the stack */
ENTRY(ffi_trampoline)
entry a1, 16 + (FFI_REGISTER_NARGS * 4) + (4 * 4) # [ 0]
j 2f # [ 3]
.align 4 # [ 6]
1: .long 0 # [ 8]
2: l32r a15, 1b # [12]
_mov a14, a0 # [15]
callx0 a15 # [18]
# [21]
END(ffi_trampoline)
/*
* ffi_closure()
*
* a0: closure + 21
* a14: return address (a0)
*/
ENTRY(ffi_closure_SYSV)
/* intentionally omitting entry here */
# restore return address (a0) and move pointer to closure to a10
addi a10, a0, -21
mov a0, a14
# allow up to 4 arguments as return values
addi a11, a1, 4 * 4
# save up to 6 arguments to stack (allocated by entry below)
s32i a2, a11, 0
s32i a3, a11, 4
s32i a4, a11, 8
s32i a5, a11, 12
s32i a6, a11, 16
s32i a7, a11, 20
movi a8, ffi_closure_SYSV_inner
mov a12, a1
callx8 a8 # .._inner(*closure, **avalue, *rvalue)
# load up to four return arguments
l32i a2, a1, 0
l32i a3, a1, 4
l32i a4, a1, 8
l32i a5, a1, 12
# (sign-)extend return value
movi a11, FFI_TYPE_UINT8
bne a10, a11, 1f
extui a2, a2, 0, 8
retw
1: movi a11, FFI_TYPE_SINT8
bne a10, a11, 1f
sext a2, a2, 7
retw
1: movi a11, FFI_TYPE_UINT16
bne a10, a11, 1f
extui a2, a2, 0, 16
retw
1: movi a11, FFI_TYPE_SINT16
bne a10, a11, 1f
sext a2, a2, 15
1: retw
END(ffi_closure_SYSV)