github.com/prattmic/llgo-embedded@v0.0.0-20150820070356-41cfecea0e1e/third_party/gofrontend/libffi/src/frv/eabi.S (about)

     1  /* -----------------------------------------------------------------------
     2     eabi.S - Copyright (c) 2004  Anthony Green
     3     
     4     FR-V Assembly glue.
     5  
     6     Permission is hereby granted, free of charge, to any person obtaining
     7     a copy of this software and associated documentation files (the
     8     ``Software''), to deal in the Software without restriction, including
     9     without limitation the rights to use, copy, modify, merge, publish,
    10     distribute, sublicense, and/or sell copies of the Software, and to
    11     permit persons to whom the Software is furnished to do so, subject to
    12     the following conditions:
    13  
    14     The above copyright notice and this permission notice shall be included
    15     in all copies or substantial portions of the Software.
    16  
    17     THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, EXPRESS
    18     OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
    19     MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
    20     IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR
    21     OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
    22     ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
    23     OTHER DEALINGS IN THE SOFTWARE.
    24     ----------------------------------------------------------------------- */
    25  
    26  #define LIBFFI_ASM	
    27  #include <fficonfig.h>
    28  #include <ffi.h>
    29  
    30  	.globl ffi_prep_args_EABI
    31  
    32  	.text
    33  	.p2align 4
    34  	.globl ffi_call_EABI
    35  	.type ffi_call_EABI, @function
    36  
    37  	# gr8 :   ffi_prep_args
    38  	# gr9 :   &ecif
    39  	# gr10:   cif->bytes
    40  	# gr11:   fig->flags
    41  	# gr12:   ecif.rvalue
    42  	# gr13:   fn
    43  	
    44  ffi_call_EABI:	
    45  	addi	sp, #-80, sp
    46  	sti	fp, @(sp, #24)
    47  	addi	sp, #24, fp
    48  	movsg	lr, gr5
    49  
    50  	/* Make room for the new arguments.  */
    51  	/* subi	sp, fp, gr10 */
    52  	
    53  	/* Store return address and incoming args on stack.  */
    54  	sti	gr5, @(fp, #8)
    55  	sti	gr8, @(fp, #-4)
    56  	sti	gr9, @(fp, #-8)
    57  	sti	gr10, @(fp, #-12)
    58  	sti	gr11, @(fp, #-16)
    59  	sti	gr12, @(fp, #-20)
    60  	sti	gr13, @(fp, #-24)
    61  
    62  	sub     sp, gr10, sp
    63  	
    64  	/* Call ffi_prep_args.  */
    65  	ldi	@(fp, #-4), gr4
    66  	addi	sp, #0, gr8
    67  	ldi	@(fp, #-8), gr9
    68  #ifdef __FRV_FDPIC__
    69  	ldd	@(gr4, gr0), gr14
    70  	calll	@(gr14, gr0)
    71  #else
    72  	calll	@(gr4, gr0)
    73  #endif	
    74  
    75  	/* ffi_prep_args returns the new stack pointer.  */
    76  	mov	gr8, gr4
    77  		
    78  	ldi	@(sp, #0), gr8
    79  	ldi	@(sp, #4), gr9
    80  	ldi	@(sp, #8), gr10
    81  	ldi	@(sp, #12), gr11
    82  	ldi	@(sp, #16), gr12
    83  	ldi	@(sp, #20), gr13
    84  
    85  	/* Always copy the return value pointer into the hidden
    86  	   parameter register.  This is only strictly necessary
    87  	   when we're returning an aggregate type, but it doesn't
    88  	   hurt to do this all the time, and it saves a branch.  */
    89  	ldi	@(fp, #-20), gr3
    90  
    91  	/* Use the ffi_prep_args return value for the new sp.  */
    92  	mov	gr4, sp
    93  	
    94  	/* Call the target function.  */
    95  	ldi	@(fp, -24), gr4
    96  #ifdef __FRV_FDPIC__
    97  	ldd	@(gr4, gr0), gr14
    98  	calll	@(gr14, gr0)
    99  #else
   100  	calll	@(gr4, gr0)
   101  #endif	
   102  
   103  	/* Store the result. */
   104  	ldi	@(fp, #-16), gr10  /* fig->flags */
   105  	ldi	@(fp, #-20), gr4   /* ecif.rvalue */
   106  
   107  	/* Is the return value stored in two registers?  */
   108  	cmpi	gr10, #8, icc0
   109  	bne	icc0, 0, .L2
   110  	/*   Yes, save them.  */
   111  	sti	gr8, @(gr4, #0)
   112  	sti	gr9, @(gr4, #4)
   113  	bra	.L3
   114  .L2:
   115  	/* Is the return value a structure?  */
   116  	cmpi	gr10, #-1, icc0
   117  	beq	icc0, 0, .L3
   118  	/*   No, save a 4 byte return value.  */
   119  	sti	gr8, @(gr4, #0)
   120  .L3:	
   121  
   122  	/* Restore the stack, and return.  */
   123  	ldi	@(fp, 8), gr5
   124  	ld	@(fp, gr0), fp
   125  	addi	sp,#80,sp
   126  	jmpl	@(gr5,gr0)
   127  	.size ffi_call_EABI, .-ffi_call_EABI
   128