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

     1  /* -----------------------------------------------------------------------
     2     arcompact.S - Copyright (c) 2013 Synposys, Inc. (www.synopsys.com)
     3     
     4     ARCompact Foreign Function Interface 
     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 RENESAS TECHNOLOGY 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  #ifdef HAVE_MACHINE_ASM_H
    30  #include <machine/asm.h>
    31  #else
    32  #define CNAME(x) x
    33  #define ENTRY(x) .globl CNAME(x)` .type CNAME(x),%function` CNAME(x):
    34  #endif
    35  
    36  .text
    37  
    38          /* R0:   ffi_prep_args */
    39          /* R1:   &ecif */
    40          /* R2:   cif->bytes */
    41          /* R3:   fig->flags */
    42          /* R4:   ecif.rvalue */
    43          /* R5:   fn */
    44  ENTRY(ffi_call_ARCompact)
    45          /* Save registers.  */
    46          st.a       fp, [sp, -4]        /* fp + 20, fp */
    47          push_s     blink               /* fp + 16, blink */
    48          st.a       r4, [sp, -4]        /* fp + 12, ecif.rvalue */
    49          push_s     r3                  /* fp +  8, fig->flags */
    50          st.a       r5, [sp, -4]        /* fp +  4, fn */
    51          push_s     r2                  /* fp +  0, cif->bytes */
    52          mov        fp, sp
    53  
    54          /* Make room for all of the new args.  */
    55          sub        sp, sp, r2
    56  
    57          /* Place all of the ffi_prep_args in position.  */
    58          /* ffi_prep_args(char *stack, extended_cif *ecif) */
    59          /* R1 already set.  */
    60  
    61          /* And call.  */
    62          jl_s.d     [r0]
    63          mov_s      r0, sp
    64  
    65          ld.ab      r12, [fp, 4]        /* cif->bytes */
    66          ld.ab      r11, [fp, 4]        /* fn */
    67  
    68          /* Move first 8 parameters in registers...  */
    69          ld_s       r0, [sp]
    70          ld_s       r1, [sp, 4]
    71          ld_s       r2, [sp, 8]
    72          ld_s       r3, [sp, 12]
    73          ld         r4, [sp, 16]
    74          ld         r5, [sp, 20]
    75          ld         r6, [sp, 24]
    76          ld         r7, [sp, 28]
    77  
    78          /* ...and adjust the stack.  */
    79          min        r12, r12, 32
    80  
    81          /* Call the function.  */
    82          jl.d       [r11]
    83          add        sp, sp, r12 
    84  
    85          mov        sp, fp        
    86          pop_s      r3        /* fig->flags, return type */
    87          pop_s      r2        /* ecif.rvalue, pointer for return value */
    88  
    89          /* If the return value pointer is NULL, assume no return value.  */
    90          breq.d     r2, 0, epilogue
    91          pop_s      blink
    92  
    93          /* Return INT.  */
    94          brne       r3, FFI_TYPE_INT, return_double
    95          b.d        epilogue
    96          st_s       r0, [r2]        
    97  
    98  return_double:
    99          brne       r3, FFI_TYPE_DOUBLE, epilogue
   100          st_s       r0, [r2]        
   101          st_s       r1, [r2,4]
   102  
   103  epilogue:
   104          j_s.d      [blink]
   105          ld.ab      fp, [sp, 4]
   106  
   107  ENTRY(ffi_closure_ARCompact)
   108          st.a       r0, [sp, -32]
   109          st_s       r1, [sp, 4]
   110          st_s       r2, [sp, 8]
   111          st_s       r3, [sp, 12]
   112          st         r4, [sp, 16]
   113          st         r5, [sp, 20]
   114          st         r6, [sp, 24]
   115          st         r7, [sp, 28]
   116  
   117          /* pointer to arguments */
   118          mov_s      r2, sp
   119  
   120          /* return value goes here */
   121          sub        sp, sp, 8
   122          mov_s      r1, sp
   123  
   124          push_s     blink
   125          
   126          bl.d       ffi_closure_inner_ARCompact
   127          mov_s      r0, r8                /* codeloc, set by trampoline */
   128  
   129          pop_s      blink
   130  
   131          /* set return value to r1:r0 */
   132          pop_s      r0
   133          pop_s      r1
   134          j_s.d      [blink]
   135          add_s      sp, sp, 32