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/* -----------------------------------------------------------------------
   sysv.S - Copyright (c) 1998, 2008 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 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>
#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__) || defined(__ARM_ARCH_6T2__) \
        || defined(__ARM_ARCH_6M__)
# undef __ARM_ARCH__
# define __ARM_ARCH__ 6
#endif

#if defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) \
        || defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__) \
        || defined(__ARM_ARCH_7EM__)
# undef __ARM_ARCH__
# define __ARM_ARCH__ 7
#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

/* Conditionally compile unwinder directives.  */
#ifdef __ARM_EABI__
#define UNWIND
#else
#define UNWIND @
#endif  

        
#if defined(__thumb__) && !defined(__THUMB_INTERWORK__)
.macro  ARM_FUNC_START name
        .text
        .align 0
        .thumb
        .thumb_func
        ENTRY(\name)
        bx      pc
        nop
        .arm
        UNWIND .fnstart
/* 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)
        UNWIND .fnstart
.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:   fn
        @ r1:   &ecif
        @ r2:   cif->bytes
        @ r3:   fig->flags
        @ sp+0: ecif.rvalue

        @ This assumes we are using gas.
ARM_FUNC_START ffi_call_SYSV
        @ 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, fp, r2

        @ Place all of the ffi_prep_args in position
        mov     r0, sp
        @     r1 already set

        @ Call ffi_prep_args(stack, &ecif)
        bl      ffi_prep_args

        @ move first 4 parameters in registers
        ldmia   sp, {r0-r3}

        @ and adjust stack
        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) (...)
        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
#if defined(__SOFTFP__) || defined(__ARM_EABI__)
        cmpne   r3, #FFI_TYPE_FLOAT
#endif
        streq   r0, [r2]
        beq     LSYM(Lepilogue)

        @ return INT64
        cmp     r3, #FFI_TYPE_SINT64
#if defined(__SOFTFP__) || defined(__ARM_EABI__)
        cmpne   r3, #FFI_TYPE_DOUBLE
#endif
        stmeqia r2, {r0, r1}

#if !defined(__SOFTFP__) && !defined(__ARM_EABI__)
        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:
        UNWIND .fnend
        .size    CNAME(ffi_call_SYSV),.ffi_call_SYSV_end-CNAME(ffi_call_SYSV)


/*
        unsigned int FFI_HIDDEN
        ffi_closure_SYSV_inner (closure, respp, args)
             ffi_closure *closure;
             void **respp;
             void *args;
*/

ARM_FUNC_START ffi_closure_SYSV
        UNWIND .pad #16
        add     ip, sp, #16
        stmfd   sp!, {ip, lr}
        UNWIND .save    {r0, lr}
        add     r2, sp, #8
        UNWIND .pad #16
        sub     sp, sp, #16
        str     sp, [sp, #8]
        add     r1, sp, #8
        bl      ffi_closure_SYSV_inner
        cmp     r0, #FFI_TYPE_INT
        beq     .Lretint

        cmp     r0, #FFI_TYPE_FLOAT
#if defined(__SOFTFP__) || defined(__ARM_EABI__)
        beq     .Lretint
#else
        beq     .Lretfloat
#endif

        cmp     r0, #FFI_TYPE_DOUBLE
#if defined(__SOFTFP__) || defined(__ARM_EABI__)
        beq     .Lretlonglong
#else
        beq     .Lretdouble
#endif

        cmp     r0, #FFI_TYPE_LONGDOUBLE
#if defined(__SOFTFP__) || defined(__ARM_EABI__)
        beq     .Lretlonglong
#else
        beq     .Lretlongdouble
#endif

        cmp     r0, #FFI_TYPE_SINT64
        beq     .Lretlonglong
.Lclosure_epilogue:
        add     sp, sp, #16
        ldmfd   sp, {sp, pc}
.Lretint:
        ldr     r0, [sp]
        b       .Lclosure_epilogue
.Lretlonglong:
        ldr     r0, [sp]
        ldr     r1, [sp, #4]
        b       .Lclosure_epilogue

#if !defined(__SOFTFP__) && !defined(__ARM_EABI__)
.Lretfloat:
        ldfs    f0, [sp]
        b       .Lclosure_epilogue
.Lretdouble:
        ldfd    f0, [sp]
        b       .Lclosure_epilogue
.Lretlongdouble:
        ldfd    f0, [sp]
        b       .Lclosure_epilogue
#endif

.ffi_closure_SYSV_end:
        UNWIND .fnend
        .size    CNAME(ffi_closure_SYSV),.ffi_closure_SYSV_end-CNAME(ffi_closure_SYSV)


/* Below are VFP hard-float ABI call and closure implementations.
   Add VFP FPU directive here. */
        .fpu    vfp

        @ 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)


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
        UNWIND .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)

ENTRY(ffi_arm_trampoline)
        stmfd sp!, {r0-r3}
        ldr r0, [pc]
        ldr pc, [pc]

#if defined __ELF__ && defined __linux__
        .section        .note.GNU-stack,"",%progbits
#endif