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/* -----------------------------------------------------------------------
   sysv.S - Copyright (c) 1998 Red Hat, Inc.
   
   ARM 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 CYGNUS SOLUTIONS 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>
#ifdef HAVE_MACHINE_ASM_H
#include <machine/asm.h>
#else
#ifdef __USER_LABEL_PREFIX__
#define CONCAT1(a, b) CONCAT2(a, b)
#define CONCAT2(a, b) a ## b

/* Use the right prefix for global labels.  */
#define CNAME(x) CONCAT1 (__USER_LABEL_PREFIX__, x)
#else
#define CNAME(x) x
#endif
#define ENTRY(x) .globl CNAME(x); .type CNAME(x),%function; CNAME(x):
#endif

#ifdef __ELF__
#define LSYM(x) .x
#else
#define LSYM(x) x
#endif

/* We need a better way of testing for this, but for now, this is all 
   we can do.  */
@ This selects the minimum architecture level required.
#define __ARM_ARCH__ 3

#if defined(__ARM_ARCH_4__) || defined(__ARM_ARCH_4T__)
# undef __ARM_ARCH__
# define __ARM_ARCH__ 4
#endif
        
#if defined(__ARM_ARCH_5__) || defined(__ARM_ARCH_5T__) \
        || defined(__ARM_ARCH_5E__) || defined(__ARM_ARCH_5TE__) \
        || defined(__ARM_ARCH_5TEJ__)
# undef __ARM_ARCH__
# define __ARM_ARCH__ 5
#endif

#if defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) \
        || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6Z__) \
        || defined(__ARM_ARCH_6ZK__)
# undef __ARM_ARCH__
# define __ARM_ARCH__ 6
#endif

#if __ARM_ARCH__ >= 5
# define call_reg(x)    blx     x
#elif defined (__ARM_ARCH_4T__)
# define call_reg(x)    mov     lr, pc ; bx     x
# if defined(__thumb__) || defined(__THUMB_INTERWORK__)
#  define __INTERWORKING__
# endif
#else
# define call_reg(x)    mov     lr, pc ; mov    pc, x
#endif

#if defined(__thumb__) && !defined(__THUMB_INTERWORK__)
.macro  ARM_FUNC_START name
        .text
        .align 0
        .thumb
        .thumb_func
        ENTRY(\name)
        bx      pc
        nop
        .arm
/* A hook to tell gdb that we've switched to ARM mode.  Also used to call
   directly from other local arm routines.  */
_L__\name:              
.endm
#else
.macro  ARM_FUNC_START name
        .text
        .align 0
        .arm
        ENTRY(\name)
.endm
#endif

.macro  RETLDM  regs=, cond=, dirn=ia
#if defined (__INTERWORKING__)
        .ifc "\regs",""
        ldr\cond        lr, [sp], #4
        .else
        ldm\cond\dirn   sp!, {\regs, lr}
        .endif
        bx\cond lr
#else
        .ifc "\regs",""
        ldr\cond        pc, [sp], #4
        .else
        ldm\cond\dirn   sp!, {\regs, pc}
        .endif
#endif
.endm


        @ r0:   ffi_prep_args
        @ 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
        @ Save registers
        stmfd   sp!, {r0-r3, fp, lr}
        mov     fp, sp

        @ Make room for all of the new args.
        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)

        @ 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

        @ call (fn) (...)
        ldr     ip, [fp, #28]
        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)

@ return INT
        cmp     r3, #FFI_TYPE_INT
#ifdef __SOFTFP__
        cmpne   r3, #FFI_TYPE_FLOAT
#endif
        streq   r0, [r2]
        beq     LSYM(Lepilogue)

        @ return INT64
        cmp     r3, #FFI_TYPE_SINT64
#ifdef __SOFTFP__
        cmpne   r3, #FFI_TYPE_DOUBLE
#endif
        stmeqia r2, {r0, r1}

#ifndef __SOFTFP__
        beq     LSYM(Lepilogue)

@ return FLOAT
        cmp     r3, #FFI_TYPE_FLOAT
        stfeqs  f0, [r2]
        beq     LSYM(Lepilogue)

@ return DOUBLE or LONGDOUBLE
        cmp     r3, #FFI_TYPE_DOUBLE
        stfeqd  f0, [r2]
#endif

LSYM(Lepilogue):
        RETLDM  "r0-r3,fp"

.ffi_call_SYSV_end:
        .size    CNAME(ffi_call_SYSV),.ffi_call_SYSV_end-CNAME(ffi_call_SYSV)