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Add ARM VFP ABI support to libffi.

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From-SVN: r166032
This commit is contained in:
Chung-Lin Tang 2010-10-28 18:11:11 +00:00 committed by Anthony Green
parent f17aa4adf8
commit 46e0720d66
7 changed files with 484 additions and 30 deletions
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38
libffi/ChangeLog
View File

@ -1,3 +1,41 @@
2010-10-28 Chung-Lin Tang <cltang@codesourcery.com>
* src/arm/ffi.c (ffi_prep_args): Add VFP register argument handling
code, new parameter, and return value. Update comments.
(ffi_prep_cif_machdep): Add case for VFP struct return values. Add
call to layout_vfp_args().
(ffi_call_SYSV): Update declaration.
(ffi_call_VFP): New declaration.
(ffi_call): Add VFP struct return conditions. Call ffi_call_VFP()
when ABI is FFI_VFP.
(ffi_closure_VFP): New declaration.
(ffi_closure_SYSV_inner): Add new vfp_args parameter, update call to
ffi_prep_incoming_args_SYSV().
(ffi_prep_incoming_args_SYSV): Update parameters. Add VFP argument
case handling.
(ffi_prep_closure_loc): Pass ffi_closure_VFP to trampoline
construction under VFP hard-float.
(rec_vfp_type_p): New function.
(vfp_type_p): Same.
(place_vfp_arg): Same.
(layout_vfp_args): Same.
* src/arm/ffitarget.h (ffi_abi): Add FFI_VFP. Define FFI_DEFAULT_ABI
based on __ARM_PCS_VFP.
(FFI_EXTRA_CIF_FIELDS): Define for adding VFP hard-float specific
fields.
(FFI_TYPE_STRUCT_VFP_FLOAT): Define internally used type code.
(FFI_TYPE_STRUCT_VFP_DOUBLE): Same.
* src/arm/sysv.S (ffi_call_SYSV): Change call of ffi_prep_args() to
direct call. Move function pointer load upwards.
(ffi_call_VFP): New function.
(ffi_closure_VFP): Same.
* testsuite/lib/libffi-dg.exp (check-flags): New function.
(dg-skip-if): New function.
* testsuite/libffi.call/cls_double_va.c: Skip if target is arm*-*-*
and compiler options include -mfloat-abi=hard.
* testsuite/libffi.call/cls_longdouble_va.c: Same.
2010-10-01 Jakub Jelinek <jakub@redhat.com>
PR libffi/45677

231
libffi/src/arm/ffi.c
View File

@ -29,12 +29,20 @@
#include <stdlib.h>
/* ffi_prep_args is called by the assembly routine once stack space
has been allocated for the function's arguments */
/* Forward declares. */
static int vfp_type_p (ffi_type *);
static void layout_vfp_args (ffi_cif *);
void ffi_prep_args(char *stack, extended_cif *ecif)
/* ffi_prep_args is called by the assembly routine once stack space
has been allocated for the function's arguments
The vfp_space parameter is the load area for VFP regs, the return
value is cif->vfp_used (word bitset of VFP regs used for passing
arguments). These are only used for the VFP hard-float ABI.
*/
int ffi_prep_args(char *stack, extended_cif *ecif, float *vfp_space)
{
register unsigned int i;
register unsigned int i, vi = 0;
register void **p_argv;
register char *argp;
register ffi_type **p_arg;
@ -54,6 +62,21 @@ void ffi_prep_args(char *stack, extended_cif *ecif)
{
size_t z;
/* Allocated in VFP registers. */
if (ecif->cif->abi == FFI_VFP
&& vi < ecif->cif->vfp_nargs && vfp_type_p (*p_arg))
{
float* vfp_slot = vfp_space + ecif->cif->vfp_args[vi++];
if ((*p_arg)->type == FFI_TYPE_FLOAT)
*((float*)vfp_slot) = *((float*)*p_argv);
else if ((*p_arg)->type == FFI_TYPE_DOUBLE)
*((double*)vfp_slot) = *((double*)*p_argv);
else
memcpy(vfp_slot, *p_argv, (*p_arg)->size);
p_argv++;
continue;
}
/* Align if necessary */
if (((*p_arg)->alignment - 1) & (unsigned) argp) {
argp = (char *) ALIGN(argp, (*p_arg)->alignment);
@ -103,13 +126,15 @@ void ffi_prep_args(char *stack, extended_cif *ecif)
p_argv++;
argp += z;
}
return;
/* Indicate the VFP registers used. */
return ecif->cif->vfp_used;
}
/* Perform machine dependent cif processing */
ffi_status ffi_prep_cif_machdep(ffi_cif *cif)
{
int type_code;
/* Round the stack up to a multiple of 8 bytes. This isn't needed
everywhere, but it is on some platforms, and it doesn't harm anything
when it isn't needed. */
@ -130,7 +155,14 @@ ffi_status ffi_prep_cif_machdep(ffi_cif *cif)
break;
case FFI_TYPE_STRUCT:
if (cif->rtype->size <= 4)
if (cif->abi == FFI_VFP
&& (type_code = vfp_type_p (cif->rtype)) != 0)
{
/* A Composite Type passed in VFP registers, either
FFI_TYPE_STRUCT_VFP_FLOAT or FFI_TYPE_STRUCT_VFP_DOUBLE. */
cif->flags = (unsigned) type_code;
}
else if (cif->rtype->size <= 4)
/* A Composite Type not larger than 4 bytes is returned in r0. */
cif->flags = (unsigned)FFI_TYPE_INT;
else
@ -145,11 +177,18 @@ ffi_status ffi_prep_cif_machdep(ffi_cif *cif)
break;
}
/* Map out the register placements of VFP register args.
The VFP hard-float calling conventions are slightly more sophisticated than
the base calling conventions, so we do it here instead of in ffi_prep_args(). */
if (cif->abi == FFI_VFP)
layout_vfp_args (cif);
return FFI_OK;
}
extern void ffi_call_SYSV(void (*)(char *, extended_cif *), extended_cif *,
unsigned, unsigned, unsigned *, void (*fn)(void));
/* Prototypes for assembly functions, in sysv.S */
extern void ffi_call_SYSV (void (*fn)(void), extended_cif *, unsigned, unsigned, unsigned *);
extern void ffi_call_VFP (void (*fn)(void), extended_cif *, unsigned, unsigned, unsigned *);
void ffi_call(ffi_cif *cif, void (*fn)(void), void *rvalue, void **avalue)
{
@ -157,6 +196,8 @@ void ffi_call(ffi_cif *cif, void (*fn)(void), void *rvalue, void **avalue)
int small_struct = (cif->flags == FFI_TYPE_INT
&& cif->rtype->type == FFI_TYPE_STRUCT);
int vfp_struct = (cif->flags == FFI_TYPE_STRUCT_VFP_FLOAT
|| cif->flags == FFI_TYPE_STRUCT_VFP_DOUBLE);
ecif.cif = cif;
ecif.avalue = avalue;
@ -173,38 +214,51 @@ void ffi_call(ffi_cif *cif, void (*fn)(void), void *rvalue, void **avalue)
}
else if (small_struct)
ecif.rvalue = &temp;
else if (vfp_struct)
{
/* Largest case is double x 4. */
ecif.rvalue = alloca(32);
}
else
ecif.rvalue = rvalue;
switch (cif->abi)
{
case FFI_SYSV:
ffi_call_SYSV(ffi_prep_args, &ecif, cif->bytes, cif->flags, ecif.rvalue,
fn);
ffi_call_SYSV (fn, &ecif, cif->bytes, cif->flags, ecif.rvalue);
break;
case FFI_VFP:
ffi_call_VFP (fn, &ecif, cif->bytes, cif->flags, ecif.rvalue);
break;
default:
FFI_ASSERT(0);
break;
}
if (small_struct)
memcpy (rvalue, &temp, cif->rtype->size);
else if (vfp_struct)
memcpy (rvalue, ecif.rvalue, cif->rtype->size);
}
/** private members **/
static void ffi_prep_incoming_args_SYSV (char *stack, void **ret,
void** args, ffi_cif* cif);
void** args, ffi_cif* cif, float *vfp_stack);
void ffi_closure_SYSV (ffi_closure *);
void ffi_closure_VFP (ffi_closure *);
/* This function is jumped to by the trampoline */
unsigned int
ffi_closure_SYSV_inner (closure, respp, args)
ffi_closure_SYSV_inner (closure, respp, args, vfp_args)
ffi_closure *closure;
void **respp;
void *args;
void *vfp_args;
{
// our various things...
ffi_cif *cif;
@ -219,7 +273,7 @@ ffi_closure_SYSV_inner (closure, respp, args)
* a structure, it will re-set RESP to point to the
* structure return address. */
ffi_prep_incoming_args_SYSV(args, respp, arg_area, cif);
ffi_prep_incoming_args_SYSV(args, respp, arg_area, cif, vfp_args);
(closure->fun) (cif, *respp, arg_area, closure->user_data);
@ -229,10 +283,12 @@ ffi_closure_SYSV_inner (closure, respp, args)
/*@-exportheader@*/
static void
ffi_prep_incoming_args_SYSV(char *stack, void **rvalue,
void **avalue, ffi_cif *cif)
void **avalue, ffi_cif *cif,
/* Used only under VFP hard-float ABI. */
float *vfp_stack)
/*@=exportheader@*/
{
register unsigned int i;
register unsigned int i, vi = 0;
register void **p_argv;
register char *argp;
register ffi_type **p_arg;
@ -249,8 +305,16 @@ ffi_prep_incoming_args_SYSV(char *stack, void **rvalue,
for (i = cif->nargs, p_arg = cif->arg_types; (i != 0); i--, p_arg++)
{
size_t z;
size_t alignment;
if (cif->abi == FFI_VFP
&& vi < cif->vfp_nargs && vfp_type_p (*p_arg))
{
*p_argv++ = (void*)(vfp_stack + cif->vfp_args[vi++]);
continue;
}
size_t alignment = (*p_arg)->alignment;
alignment = (*p_arg)->alignment;
if (alignment < 4)
alignment = 4;
/* Align if necessary */
@ -295,10 +359,17 @@ ffi_prep_closure_loc (ffi_closure* closure,
void *user_data,
void *codeloc)
{
FFI_ASSERT (cif->abi == FFI_SYSV);
void (*closure_func)(ffi_closure*) = NULL;
if (cif->abi == FFI_SYSV)
closure_func = &ffi_closure_SYSV;
else if (cif->abi == FFI_VFP)
closure_func = &ffi_closure_VFP;
else
FFI_ASSERT (0);
FFI_INIT_TRAMPOLINE (&closure->tramp[0], \
&ffi_closure_SYSV, \
closure_func, \
codeloc);
closure->cif = cif;
@ -307,3 +378,123 @@ ffi_prep_closure_loc (ffi_closure* closure,
return FFI_OK;
}
/* Below are routines for VFP hard-float support. */
static int rec_vfp_type_p (ffi_type *t, int *elt, int *elnum)
{
switch (t->type)
{
case FFI_TYPE_FLOAT:
case FFI_TYPE_DOUBLE:
*elt = (int) t->type;
*elnum = 1;
return 1;
case FFI_TYPE_STRUCT_VFP_FLOAT:
*elt = FFI_TYPE_FLOAT;
*elnum = t->size / sizeof (float);
return 1;
case FFI_TYPE_STRUCT_VFP_DOUBLE:
*elt = FFI_TYPE_DOUBLE;
*elnum = t->size / sizeof (double);
return 1;
case FFI_TYPE_STRUCT:;
{
int base_elt = 0, total_elnum = 0;
ffi_type **el = t->elements;
while (*el)
{
int el_elt = 0, el_elnum = 0;
if (! rec_vfp_type_p (*el, &el_elt, &el_elnum)
|| (base_elt && base_elt != el_elt)
|| total_elnum + el_elnum > 4)
return 0;
base_elt = el_elt;
total_elnum += el_elnum;
el++;
}
*elnum = total_elnum;
*elt = base_elt;
return 1;
}
default: ;
}
return 0;
}
static int vfp_type_p (ffi_type *t)
{
int elt, elnum;
if (rec_vfp_type_p (t, &elt, &elnum))
{
if (t->type == FFI_TYPE_STRUCT)
{
if (elnum == 1)
t->type = elt;
else
t->type = (elt == FFI_TYPE_FLOAT
? FFI_TYPE_STRUCT_VFP_FLOAT
: FFI_TYPE_STRUCT_VFP_DOUBLE);
}
return (int) t->type;
}
return 0;
}
static void place_vfp_arg (ffi_cif *cif, ffi_type *t)
{
int reg = cif->vfp_reg_free;
int nregs = t->size / sizeof (float);
int align = ((t->type == FFI_TYPE_STRUCT_VFP_FLOAT
|| t->type == FFI_TYPE_FLOAT) ? 1 : 2);
/* Align register number. */
if ((reg & 1) && align == 2)
reg++;
while (reg + nregs <= 16)
{
int s, new_used = 0;
for (s = reg; s < reg + nregs; s++)
{
new_used |= (1 << s);
if (cif->vfp_used & (1 << s))
{
reg += align;
goto next_reg;
}
}
/* Found regs to allocate. */
cif->vfp_used |= new_used;
cif->vfp_args[cif->vfp_nargs++] = reg;
/* Update vfp_reg_free. */
if (cif->vfp_used & (1 << cif->vfp_reg_free))
{
reg += nregs;
while (cif->vfp_used & (1 << reg))
reg += 1;
cif->vfp_reg_free = reg;
}
return;
next_reg: ;
}
}
static void layout_vfp_args (ffi_cif *cif)
{
int i;
/* Init VFP fields */
cif->vfp_used = 0;
cif->vfp_nargs = 0;
cif->vfp_reg_free = 0;
memset (cif->vfp_args, -1, 16); /* Init to -1. */
for (i = 0; i < cif->nargs; i++)
{
ffi_type *t = cif->arg_types[i];
if (vfp_type_p (t))
place_vfp_arg (cif, t);
}
}

18
libffi/src/arm/ffitarget.h
View File

@ -1,5 +1,7 @@
/* -----------------------------------------------------------------*-C-*-
ffitarget.h - Copyright (c) 1996-2003 Red Hat, Inc.
Copyright (c) 2010 CodeSourcery
Target configuration macros for ARM.
Permission is hereby granted, free of charge, to any person obtaining
@ -34,11 +36,25 @@ typedef signed long ffi_sarg;
typedef enum ffi_abi {
FFI_FIRST_ABI = 0,
FFI_SYSV,
FFI_VFP,
FFI_LAST_ABI,
#ifdef __ARM_PCS_VFP
FFI_DEFAULT_ABI = FFI_VFP,
#else
FFI_DEFAULT_ABI = FFI_SYSV,
FFI_LAST_ABI = FFI_DEFAULT_ABI + 1
#endif
} ffi_abi;
#endif
#define FFI_EXTRA_CIF_FIELDS \
int vfp_used; \
short vfp_reg_free, vfp_nargs; \
signed char vfp_args[16] \
/* Internally used. */
#define FFI_TYPE_STRUCT_VFP_FLOAT (FFI_TYPE_LAST + 1)
#define FFI_TYPE_STRUCT_VFP_DOUBLE (FFI_TYPE_LAST + 2)
/* ---- Definitions for closures ----------------------------------------- */
#define FFI_CLOSURES 1

173
libffi/src/arm/sysv.S
View File

@ -142,12 +142,11 @@ _L__\name:
.endm
@ r0: ffi_prep_args
@ r0: fn
@ r1: &ecif
@ r2: cif->bytes
@ r3: fig->flags
@ sp+0: ecif.rvalue
@ sp+4: fn
@ This assumes we are using gas.
ARM_FUNC_START ffi_call_SYSV
@ -162,24 +161,23 @@ ARM_FUNC_START ffi_call_SYSV
sub sp, fp, r2
@ Place all of the ffi_prep_args in position
mov ip, r0
mov r0, sp
@ r1 already set
@ Call ffi_prep_args(stack, &ecif)
call_reg(ip)
bl ffi_prep_args
@ move first 4 parameters in registers
ldmia sp, {r0-r3}
@ and adjust stack
ldr ip, [fp, #8]
cmp ip, #16
movhs ip, #16
add sp, sp, ip
sub lr, fp, sp @ cif->bytes == fp - sp
ldr ip, [fp] @ load fn() in advance
cmp lr, #16
movhs lr, #16
add sp, sp, lr
@ call (fn) (...)
ldr ip, [fp, #28]
call_reg(ip)
@ Remove the space we pushed for the args
@ -230,6 +228,101 @@ LSYM(Lepilogue):
UNWIND .fnend
.size CNAME(ffi_call_SYSV),.ffi_call_SYSV_end-CNAME(ffi_call_SYSV)
@ r0: fn
@ r1: &ecif
@ r2: cif->bytes
@ r3: fig->flags
@ sp+0: ecif.rvalue
ARM_FUNC_START ffi_call_VFP
@ Save registers
stmfd sp!, {r0-r3, fp, lr}
UNWIND .save {r0-r3, fp, lr}
mov fp, sp
UNWIND .setfp fp, sp
@ Make room for all of the new args.
sub sp, sp, r2
@ Make room for loading VFP args
sub sp, sp, #64
@ Place all of the ffi_prep_args in position
mov r0, sp
@ r1 already set
sub r2, fp, #64 @ VFP scratch space
@ Call ffi_prep_args(stack, &ecif, vfp_space)
bl ffi_prep_args
@ Load VFP register args if needed
cmp r0, #0
beq LSYM(Lbase_args)
@ Load only d0 if possible
cmp r0, #3
sub ip, fp, #64
flddle d0, [ip]
fldmiadgt ip, {d0-d7}
LSYM(Lbase_args):
@ move first 4 parameters in registers
ldmia sp, {r0-r3}
@ and adjust stack
sub lr, ip, sp @ cif->bytes == (fp - 64) - sp
ldr ip, [fp] @ load fn() in advance
cmp lr, #16
movhs lr, #16
add sp, sp, lr
@ call (fn) (...)
call_reg(ip)
@ Remove the space we pushed for the args
mov sp, fp
@ Load r2 with the pointer to storage for
@ the return value
ldr r2, [sp, #24]
@ Load r3 with the return type code
ldr r3, [sp, #12]
@ If the return value pointer is NULL,
@ assume no return value.
cmp r2, #0
beq LSYM(Lepilogue_vfp)
cmp r3, #FFI_TYPE_INT
streq r0, [r2]
beq LSYM(Lepilogue_vfp)
cmp r3, #FFI_TYPE_SINT64
stmeqia r2, {r0, r1}
beq LSYM(Lepilogue_vfp)
cmp r3, #FFI_TYPE_FLOAT
fstseq s0, [r2]
beq LSYM(Lepilogue_vfp)
cmp r3, #FFI_TYPE_DOUBLE
fstdeq d0, [r2]
beq LSYM(Lepilogue_vfp)
cmp r3, #FFI_TYPE_STRUCT_VFP_FLOAT
cmpne r3, #FFI_TYPE_STRUCT_VFP_DOUBLE
fstmiadeq r2, {d0-d3}
LSYM(Lepilogue_vfp):
RETLDM "r0-r3,fp"
.ffi_call_VFP_end:
UNWIND .fnend
.size CNAME(ffi_call_VFP),.ffi_call_VFP_end-CNAME(ffi_call_VFP)
/*
unsigned int FFI_HIDDEN
ffi_closure_SYSV_inner (closure, respp, args)
@ -302,6 +395,68 @@ ARM_FUNC_START ffi_closure_SYSV
UNWIND .fnend
.size CNAME(ffi_closure_SYSV),.ffi_closure_SYSV_end-CNAME(ffi_closure_SYSV)
ARM_FUNC_START ffi_closure_VFP
fstmfdd sp!, {d0-d7}
@ r0-r3, then d0-d7
UNWIND .pad #80
add ip, sp, #80
stmfd sp!, {ip, lr}
UNWIND .save {r0, lr}
add r2, sp, #72
add r3, sp, #8
.pad #72
sub sp, sp, #72
str sp, [sp, #64]
add r1, sp, #64
bl ffi_closure_SYSV_inner
cmp r0, #FFI_TYPE_INT
beq .Lretint_vfp
cmp r0, #FFI_TYPE_FLOAT
beq .Lretfloat_vfp
cmp r0, #FFI_TYPE_DOUBLE
cmpne r0, #FFI_TYPE_LONGDOUBLE
beq .Lretdouble_vfp
cmp r0, #FFI_TYPE_SINT64
beq .Lretlonglong_vfp
cmp r0, #FFI_TYPE_STRUCT_VFP_FLOAT
beq .Lretfloat_struct_vfp
cmp r0, #FFI_TYPE_STRUCT_VFP_DOUBLE
beq .Lretdouble_struct_vfp
.Lclosure_epilogue_vfp:
add sp, sp, #72
ldmfd sp, {sp, pc}
.Lretfloat_vfp:
flds s0, [sp]
b .Lclosure_epilogue_vfp
.Lretdouble_vfp:
fldd d0, [sp]
b .Lclosure_epilogue_vfp
.Lretint_vfp:
ldr r0, [sp]
b .Lclosure_epilogue_vfp
.Lretlonglong_vfp:
ldmia sp, {r0, r1}
b .Lclosure_epilogue_vfp
.Lretfloat_struct_vfp:
fldmiad sp, {d0-d1}
b .Lclosure_epilogue_vfp
.Lretdouble_struct_vfp:
fldmiad sp, {d0-d3}
b .Lclosure_epilogue_vfp
.ffi_closure_VFP_end:
UNWIND .fnend
.size CNAME(ffi_closure_VFP),.ffi_closure_VFP_end-CNAME(ffi_closure_VFP)
#if defined __ELF__ && defined __linux__
.section .note.GNU-stack,"",%progbits
#endif

50
libffi/testsuite/lib/libffi-dg.exp
View File

@ -272,6 +272,56 @@ proc dg-xfail-if { args } {
}
}
proc check-flags { args } {
# The args are within another list; pull them out.
set args [lindex $args 0]
# The next two arguments are optional. If they were not specified,
# use the defaults.
if { [llength $args] == 2 } {
lappend $args [list "*"]
}
if { [llength $args] == 3 } {
lappend $args [list ""]
}
# If the option strings are the defaults, or the same as the
# defaults, there is no need to call check_conditional_xfail to
# compare them to the actual options.
if { [string compare [lindex $args 2] "*"] == 0
&& [string compare [lindex $args 3] "" ] == 0 } {
set result 1
} else {
# The target list might be an effective-target keyword, so replace
# the original list with "*-*-*", since we already know it matches.
set result [check_conditional_xfail [lreplace $args 1 1 "*-*-*"]]
}
return $result
}
proc dg-skip-if { args } {
# Verify the number of arguments. The last two are optional.
set args [lreplace $args 0 0]
if { [llength $args] < 2 || [llength $args] > 4 } {
error "dg-skip-if 2: need 2, 3, or 4 arguments"
}
# Don't bother if we're already skipping the test.
upvar dg-do-what dg-do-what
if { [lindex ${dg-do-what} 1] == "N" } {
return
}
set selector [list target [lindex $args 1]]
if { [dg-process-target $selector] == "S" } {
if [check-flags $args] {
upvar dg-do-what dg-do-what
set dg-do-what [list [lindex ${dg-do-what} 0] "N" "P"]
}
}
}
# We need to make sure that additional_files and additional_sources
# are both cleared out after every test. It is not enough to clear

2
libffi/testsuite/libffi.call/cls_double_va.c
View File

@ -6,6 +6,8 @@
/* { dg-do run { xfail strongarm*-*-* xscale*-*-* } } */
/* { dg-output "" { xfail avr32*-*-* } } */
/* { dg-skip-if "" arm*-*-* { "-mfloat-abi=hard" } { "" } } */
#include "ffitest.h"
static void

2
libffi/testsuite/libffi.call/cls_longdouble_va.c
View File

@ -6,6 +6,8 @@
/* { dg-do run { xfail strongarm*-*-* xscale*-*-* } } */
/* { dg-output "" { xfail avr32*-*-* x86_64-*-mingw* } } */
/* { dg-skip-if "" arm*-*-* { "-mfloat-abi=hard" } { "" } } */
#include "ffitest.h"
static void