/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2008-2011. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* %CopyrightEnd%
*/
#ifndef HIPE_RISC_GLUE_H
#define HIPE_RISC_GLUE_H
/* arch wrapper does:
* #include "hipe_${arch}_asm.h" // for NR_ARG_REGS, ${ARCH}_LEAF_WORDS
* #define NR_LEAF_WORDS ${ARCH}_LEAF_WORDS
* #define HIPE_ARCH_CALL_TO_NATIVE hipe_${arch}_call_to_native
* #define HIPE_ARCH_RETURN_TO_NATIVE hipe_${arch}_return_to_native
* #define HIPE_ARCH_TAILCALL_TO_NATIVE hipe_${arch}_tailcall_to_native
* #define HIPE_ARCH_THROW_TO_NATIVE hipe_${arch}_throw_to_native
* #include "hipe_risc_glue.h"
*/
/* Emulated code recursively calls native code.
The return address is `nbif_return', which is exported so that
tailcalls from native to emulated code can be identified. */
unsigned int HIPE_ARCH_CALL_TO_NATIVE(Process*);
AEXTERN(void,nbif_return,(void));
/* Native-mode stubs for calling emulated-mode closures. */
AEXTERN(void,nbif_ccallemu0,(void));
AEXTERN(void,nbif_ccallemu1,(void));
AEXTERN(void,nbif_ccallemu2,(void));
AEXTERN(void,nbif_ccallemu3,(void));
AEXTERN(void,nbif_ccallemu4,(void));
AEXTERN(void,nbif_ccallemu5,(void));
AEXTERN(void,nbif_ccallemu6,(void));
/* Default exception handler for native code. */
AEXTERN(void,nbif_fail,(void));
/* Emulated code returns to its native code caller. */
unsigned int HIPE_ARCH_RETURN_TO_NATIVE(Process*);
/* Emulated code tailcalls native code. */
unsigned int HIPE_ARCH_TAILCALL_TO_NATIVE(Process*);
/* Emulated code throws an exception to its native code caller. */
unsigned int HIPE_ARCH_THROW_TO_NATIVE(Process*);
static __inline__ unsigned int max(unsigned int x, unsigned int y)
{
return (x > y) ? x : y;
}
static __inline__ void hipe_arch_glue_init(void)
{
static struct sdesc_with_exnra nbif_return_sdesc = {
.exnra = (unsigned long)&nbif_fail,
.sdesc = {
.bucket = { .hvalue = (unsigned long)&nbif_return },
.summary = (1<<8),
},
};
hipe_init_sdesc_table(&nbif_return_sdesc.sdesc);
}
static __inline__ void hipe_push_risc_nra_frame(Process *p)
{
p->hipe.nsp -= 1;
p->hipe.nsp[0] = (Eterm)p->hipe.nra;
}
static __inline__ void hipe_pop_risc_nra_frame(Process *p)
{
p->hipe.nra = (void(*)(void))p->hipe.nsp[0];
p->hipe.nsp += 1;
}
/* PRE: arity <= NR_ARG_REGS */
static __inline__ void
hipe_write_risc_regs(Process *p, unsigned int arity, Eterm reg[])
{
#if NR_ARG_REGS > 0
int i;
for (i = arity; --i >= 0;)
p->def_arg_reg[i] = reg[i];
#endif
}
/* PRE: arity <= NR_ARG_REGS */
static __inline__ void
hipe_read_risc_regs(Process *p, unsigned int arity, Eterm reg[])
{
#if NR_ARG_REGS > 0
int i;
for (i = arity; --i >= 0;)
reg[i] = p->def_arg_reg[i];
#endif
}
static __inline__ void
hipe_push_risc_params(Process *p, unsigned int arity, Eterm reg[])
{
unsigned int i;
i = arity;
if (i > NR_ARG_REGS) {
Eterm *nsp = p->hipe.nsp;
i = NR_ARG_REGS;
do {
*--nsp = reg[i++];
} while (i < arity);
p->hipe.nsp = nsp;
i = NR_ARG_REGS;
}
/* INV: i <= NR_ARG_REGS */
hipe_write_risc_regs(p, i, reg);
}
static __inline__ void
hipe_pop_risc_params(Process *p, unsigned int arity, Eterm reg[])
{
unsigned int i;
i = arity;
if (i > NR_ARG_REGS) {
Eterm *nsp = p->hipe.nsp;
do {
reg[--i] = *nsp++;
} while (i > NR_ARG_REGS);
p->hipe.nsp = nsp;
/* INV: i == NR_ARG_REGS */
}
/* INV: i <= NR_ARG_REGS */
hipe_read_risc_regs(p, i, reg);
}
/* BEAM recursively calls native code. */
static __inline__ unsigned int
hipe_call_to_native(Process *p, unsigned int arity, Eterm reg[])
{
int nstkargs;
if ((nstkargs = arity - NR_ARG_REGS) < 0)
nstkargs = 0;
hipe_check_nstack(p, max(nstkargs + 1, NR_LEAF_WORDS));
hipe_push_risc_nra_frame(p); /* needs 1 word */
hipe_push_risc_params(p, arity, reg); /* needs nstkargs words */
return HIPE_ARCH_CALL_TO_NATIVE(p);
}
/* Native called BEAM, which now tailcalls native. */
static __inline__ unsigned int
hipe_tailcall_to_native(Process *p, unsigned int arity, Eterm reg[])
{
int nstkargs;
if ((nstkargs = arity - NR_ARG_REGS) < 0)
nstkargs = 0;
hipe_check_nstack(p, max(nstkargs, NR_LEAF_WORDS));
hipe_push_risc_params(p, arity, reg); /* needs nstkargs words */
return HIPE_ARCH_TAILCALL_TO_NATIVE(p);
}
/* BEAM called native, which has returned. Clean up. */
static __inline__ void hipe_return_from_native(Process *p)
{
hipe_pop_risc_nra_frame(p);
}
/* BEAM called native, which has thrown an exception. Clean up. */
static __inline__ void hipe_throw_from_native(Process *p)
{
hipe_pop_risc_nra_frame(p);
}
/* BEAM called native, which now calls BEAM.
Move the parameters to reg[].
Return zero if this is a tailcall, non-zero if the call is recursive.
If tailcall, also clean up native stub continuation. */
static __inline__ int
hipe_call_from_native_is_recursive(Process *p, Eterm reg[])
{
hipe_pop_risc_params(p, p->arity, reg);
if (p->hipe.nra != (void(*)(void))&nbif_return)
return 1;
hipe_pop_risc_nra_frame(p);
return 0;
}
/* BEAM called native, which called BIF that returned trap
* Discard bif parameters.
* If tailcall, also clean up native stub continuation. */
static __inline__ int
hipe_trap_from_native_is_recursive(Process *p)
{
if (p->hipe.narity > NR_ARG_REGS) {
p->hipe.nsp += (p->hipe.narity - NR_ARG_REGS);
}
if (p->hipe.nra != (void(*)(void))&nbif_return)
return 1;
hipe_pop_risc_nra_frame(p);
return 0;
}
/* Native called BIF. Is it a recursive call?
i.e should we return back to native when BIF is done? */
static __inline__ int
hipe_bifcall_from_native_is_recursive(Process *p)
{
return (p->hipe.nra != (void(*)(void))&nbif_return);
}
/* Native makes a call which needs to unload the parameters.
This differs from hipe_call_from_native_is_recursive() in
that it doesn't check for or pop the BEAM-calls-native frame.
It's currently only used in the implementation of apply. */
static __inline__ void
hipe_pop_params(Process *p, unsigned int arity, Eterm reg[])
{
hipe_pop_risc_params(p, arity, reg);
}
/* Native called BEAM, which now returns back to native. */
static __inline__ unsigned int hipe_return_to_native(Process *p)
{
return HIPE_ARCH_RETURN_TO_NATIVE(p);
}
/* Native called BEAM, which now throws an exception back to native. */
static __inline__ unsigned int hipe_throw_to_native(Process *p)
{
return HIPE_ARCH_THROW_TO_NATIVE(p);
}
/* Return the address of a stub switching a native closure call to BEAM. */
static __inline__ const void *hipe_closure_stub_address(unsigned int arity)
{
#if NR_ARG_REGS == 0
return &nbif_ccallemu0;
#else /* > 0 */
switch (arity) {
case 0: return &nbif_ccallemu0;
#if NR_ARG_REGS == 1
default: return &nbif_ccallemu1;
#else /* > 1 */
case 1: return &nbif_ccallemu1;
#if NR_ARG_REGS == 2
default: return &nbif_ccallemu2;
#else /* > 2 */
case 2: return &nbif_ccallemu2;
#if NR_ARG_REGS == 3
default: return &nbif_ccallemu3;
#else /* > 3 */
case 3: return &nbif_ccallemu3;
#if NR_ARG_REGS == 4
default: return &nbif_ccallemu4;
#else /* > 4 */
case 4: return &nbif_ccallemu4;
#if NR_ARG_REGS == 5
default: return &nbif_ccallemu5;
#else /* > 5 */
case 5: return &nbif_ccallemu5;
#if NR_ARG_REGS == 6
default: return &nbif_ccallemu6;
#else
#error "NR_ARG_REGS > 6 NOT YET IMPLEMENTED"
#endif /* > 6 */
#endif /* > 5 */
#endif /* > 4 */
#endif /* > 3 */
#endif /* > 2 */
#endif /* > 1 */
}
#endif /* > 0 */
}
#endif /* HIPE_RISC_GLUE_H */
