/* -----------------------------------------------------------------------
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o32.S - Copyright (c) 1996, 1998, 2005 Red Hat, Inc.
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MIPS Foreign Function Interface
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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``Software''), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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----------------------------------------------------------------------- */
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#define LIBFFI_ASM
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#include <fficonfig.h>
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#include <ffi.h>
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/* Only build this code if we are compiling for o32 */
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#if defined(FFI_MIPS_O32)
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#define callback a0
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#define bytes a2
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#define flags a3
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#define SIZEOF_FRAME (4 * FFI_SIZEOF_ARG + 2 * FFI_SIZEOF_ARG)
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#define A3_OFF (SIZEOF_FRAME + 3 * FFI_SIZEOF_ARG)
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#define FP_OFF (SIZEOF_FRAME - 2 * FFI_SIZEOF_ARG)
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#define RA_OFF (SIZEOF_FRAME - 1 * FFI_SIZEOF_ARG)
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.abicalls
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.text
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.align 2
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.globl ffi_call_O32
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.ent ffi_call_O32
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ffi_call_O32:
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$LFB0:
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# Prologue
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SUBU $sp, SIZEOF_FRAME # Frame size
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$LCFI0:
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REG_S $fp, FP_OFF($sp) # Save frame pointer
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$LCFI1:
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REG_S ra, RA_OFF($sp) # Save return address
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$LCFI2:
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move $fp, $sp
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$LCFI3:
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move t9, callback # callback function pointer
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REG_S flags, A3_OFF($fp) # flags
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# Allocate at least 4 words in the argstack
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LI v0, 4 * FFI_SIZEOF_ARG
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blt bytes, v0, sixteen
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ADDU v0, bytes, 7 # make sure it is aligned
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and v0, -8 # to an 8 byte boundry
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sixteen:
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SUBU $sp, v0 # move the stack pointer to reflect the
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# arg space
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ADDU a0, $sp, 4 * FFI_SIZEOF_ARG
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jalr t9
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REG_L t0, A3_OFF($fp) # load the flags word
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SRL t2, t0, 4 # shift our arg info
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and t0, ((1<<4)-1) # mask out the return type
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ADDU $sp, 4 * FFI_SIZEOF_ARG # adjust $sp to new args
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bnez t0, pass_d # make it quick for int
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REG_L a0, 0*FFI_SIZEOF_ARG($sp) # just go ahead and load the
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REG_L a1, 1*FFI_SIZEOF_ARG($sp) # four regs.
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REG_L a2, 2*FFI_SIZEOF_ARG($sp)
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REG_L a3, 3*FFI_SIZEOF_ARG($sp)
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b call_it
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pass_d:
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bne t0, FFI_ARGS_D, pass_f
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l.d $f12, 0*FFI_SIZEOF_ARG($sp) # load $fp regs from args
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REG_L a2, 2*FFI_SIZEOF_ARG($sp) # passing a double
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REG_L a3, 3*FFI_SIZEOF_ARG($sp)
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b call_it
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pass_f:
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bne t0, FFI_ARGS_F, pass_d_d
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l.s $f12, 0*FFI_SIZEOF_ARG($sp) # load $fp regs from args
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REG_L a1, 1*FFI_SIZEOF_ARG($sp) # passing a float
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REG_L a2, 2*FFI_SIZEOF_ARG($sp)
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REG_L a3, 3*FFI_SIZEOF_ARG($sp)
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b call_it
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pass_d_d:
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bne t0, FFI_ARGS_DD, pass_f_f
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l.d $f12, 0*FFI_SIZEOF_ARG($sp) # load $fp regs from args
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l.d $f14, 2*FFI_SIZEOF_ARG($sp) # passing two doubles
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b call_it
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pass_f_f:
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bne t0, FFI_ARGS_FF, pass_d_f
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l.s $f12, 0*FFI_SIZEOF_ARG($sp) # load $fp regs from args
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l.s $f14, 1*FFI_SIZEOF_ARG($sp) # passing two floats
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REG_L a2, 2*FFI_SIZEOF_ARG($sp)
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REG_L a3, 3*FFI_SIZEOF_ARG($sp)
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b call_it
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pass_d_f:
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bne t0, FFI_ARGS_DF, pass_f_d
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l.d $f12, 0*FFI_SIZEOF_ARG($sp) # load $fp regs from args
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l.s $f14, 2*FFI_SIZEOF_ARG($sp) # passing double and float
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REG_L a3, 3*FFI_SIZEOF_ARG($sp)
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b call_it
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pass_f_d:
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# assume that the only other combination must be float then double
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# bne t0, FFI_ARGS_F_D, call_it
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l.s $f12, 0*FFI_SIZEOF_ARG($sp) # load $fp regs from args
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l.d $f14, 2*FFI_SIZEOF_ARG($sp) # passing double and float
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call_it:
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# Load the function pointer
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REG_L t9, SIZEOF_FRAME + 5*FFI_SIZEOF_ARG($fp)
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# If the return value pointer is NULL, assume no return value.
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REG_L t1, SIZEOF_FRAME + 4*FFI_SIZEOF_ARG($fp)
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beqz t1, noretval
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bne t2, FFI_TYPE_INT, retlonglong
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jalr t9
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REG_L t0, SIZEOF_FRAME + 4*FFI_SIZEOF_ARG($fp)
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REG_S v0, 0(t0)
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b epilogue
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retlonglong:
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# Really any 64-bit int, signed or not.
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bne t2, FFI_TYPE_UINT64, retfloat
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jalr t9
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REG_L t0, SIZEOF_FRAME + 4*FFI_SIZEOF_ARG($fp)
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REG_S v1, 4(t0)
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REG_S v0, 0(t0)
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b epilogue
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retfloat:
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bne t2, FFI_TYPE_FLOAT, retdouble
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jalr t9
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REG_L t0, SIZEOF_FRAME + 4*FFI_SIZEOF_ARG($fp)
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s.s $f0, 0(t0)
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b epilogue
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retdouble:
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bne t2, FFI_TYPE_DOUBLE, noretval
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jalr t9
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REG_L t0, SIZEOF_FRAME + 4*FFI_SIZEOF_ARG($fp)
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s.d $f0, 0(t0)
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b epilogue
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noretval:
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jalr t9
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# Epilogue
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epilogue:
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move $sp, $fp
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REG_L $fp, FP_OFF($sp) # Restore frame pointer
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REG_L ra, RA_OFF($sp) # Restore return address
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ADDU $sp, SIZEOF_FRAME # Fix stack pointer
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j ra
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$LFE0:
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.end ffi_call_O32
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/* ffi_closure_O32. Expects address of the passed-in ffi_closure
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in t4 ($12). Stores any arguments passed in registers onto the
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stack, then calls ffi_closure_mips_inner_O32, which
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then decodes them.
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Stack layout:
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3 - a3 save
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2 - a2 save
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1 - a1 save
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0 - a0 save, original sp
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-1 - ra save
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-2 - fp save
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-3 - $16 (s0) save
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-4 - cprestore
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-5 - return value high (v1)
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-6 - return value low (v0)
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-7 - f14 (le high, be low)
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-8 - f14 (le low, be high)
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-9 - f12 (le high, be low)
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-10 - f12 (le low, be high)
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-11 - Called function a3 save
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-12 - Called function a2 save
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-13 - Called function a1 save
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-14 - Called function a0 save, our sp and fp point here
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*/
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#define SIZEOF_FRAME2 (14 * FFI_SIZEOF_ARG)
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#define A3_OFF2 (SIZEOF_FRAME2 + 3 * FFI_SIZEOF_ARG)
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#define A2_OFF2 (SIZEOF_FRAME2 + 2 * FFI_SIZEOF_ARG)
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#define A1_OFF2 (SIZEOF_FRAME2 + 1 * FFI_SIZEOF_ARG)
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#define A0_OFF2 (SIZEOF_FRAME2 + 0 * FFI_SIZEOF_ARG)
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#define RA_OFF2 (SIZEOF_FRAME2 - 1 * FFI_SIZEOF_ARG)
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#define FP_OFF2 (SIZEOF_FRAME2 - 2 * FFI_SIZEOF_ARG)
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#define S0_OFF2 (SIZEOF_FRAME2 - 3 * FFI_SIZEOF_ARG)
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#define GP_OFF2 (SIZEOF_FRAME2 - 4 * FFI_SIZEOF_ARG)
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#define V1_OFF2 (SIZEOF_FRAME2 - 5 * FFI_SIZEOF_ARG)
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#define V0_OFF2 (SIZEOF_FRAME2 - 6 * FFI_SIZEOF_ARG)
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#define FA_1_1_OFF2 (SIZEOF_FRAME2 - 7 * FFI_SIZEOF_ARG)
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#define FA_1_0_OFF2 (SIZEOF_FRAME2 - 8 * FFI_SIZEOF_ARG)
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#define FA_0_1_OFF2 (SIZEOF_FRAME2 - 9 * FFI_SIZEOF_ARG)
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#define FA_0_0_OFF2 (SIZEOF_FRAME2 - 10 * FFI_SIZEOF_ARG)
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.text
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.align 2
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.globl ffi_closure_O32
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.ent ffi_closure_O32
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ffi_closure_O32:
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$LFB1:
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# Prologue
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.frame $fp, SIZEOF_FRAME2, ra
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.set noreorder
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.cpload t9
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.set reorder
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SUBU $sp, SIZEOF_FRAME2
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.cprestore GP_OFF2
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$LCFI4:
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REG_S $16, S0_OFF2($sp) # Save s0
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REG_S $fp, FP_OFF2($sp) # Save frame pointer
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REG_S ra, RA_OFF2($sp) # Save return address
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$LCFI6:
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move $fp, $sp
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$LCFI7:
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# Store all possible argument registers. If there are more than
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# four arguments, then they are stored above where we put a3.
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REG_S a0, A0_OFF2($fp)
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REG_S a1, A1_OFF2($fp)
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REG_S a2, A2_OFF2($fp)
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REG_S a3, A3_OFF2($fp)
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# Load ABI enum to s0
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REG_L $16, 20($12) # cif pointer follows tramp.
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REG_L $16, 0($16) # abi is first member.
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li $13, 1 # FFI_O32
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bne $16, $13, 1f # Skip fp save if FFI_O32_SOFT_FLOAT
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# Store all possible float/double registers.
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s.d $f12, FA_0_0_OFF2($fp)
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s.d $f14, FA_1_0_OFF2($fp)
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1:
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# Call ffi_closure_mips_inner_O32 to do the work.
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la t9, ffi_closure_mips_inner_O32
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move a0, $12 # Pointer to the ffi_closure
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addu a1, $fp, V0_OFF2
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addu a2, $fp, A0_OFF2
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addu a3, $fp, FA_0_0_OFF2
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jalr t9
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# Load the return value into the appropriate register.
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move $8, $2
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li $9, FFI_TYPE_VOID
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beq $8, $9, closure_done
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li $13, 1 # FFI_O32
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bne $16, $13, 1f # Skip fp restore if FFI_O32_SOFT_FLOAT
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li $9, FFI_TYPE_FLOAT
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l.s $f0, V0_OFF2($fp)
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beq $8, $9, closure_done
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li $9, FFI_TYPE_DOUBLE
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l.d $f0, V0_OFF2($fp)
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beq $8, $9, closure_done
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1:
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REG_L $3, V1_OFF2($fp)
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REG_L $2, V0_OFF2($fp)
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closure_done:
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# Epilogue
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move $sp, $fp
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REG_L $16, S0_OFF2($sp) # Restore s0
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REG_L $fp, FP_OFF2($sp) # Restore frame pointer
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REG_L ra, RA_OFF2($sp) # Restore return address
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ADDU $sp, SIZEOF_FRAME2
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j ra
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$LFE1:
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.end ffi_closure_O32
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/* DWARF-2 unwind info. */
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.section .eh_frame,"a",@progbits
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$Lframe0:
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.4byte $LECIE0-$LSCIE0 # Length of Common Information Entry
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$LSCIE0:
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.4byte 0x0 # CIE Identifier Tag
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.byte 0x1 # CIE Version
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.ascii "zR\0" # CIE Augmentation
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.uleb128 0x1 # CIE Code Alignment Factor
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.sleb128 4 # CIE Data Alignment Factor
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.byte 0x1f # CIE RA Column
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.uleb128 0x1 # Augmentation size
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.byte 0x00 # FDE Encoding (absptr)
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.byte 0xc # DW_CFA_def_cfa
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.uleb128 0x1d
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.uleb128 0x0
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.align 2
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$LECIE0:
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$LSFDE0:
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.4byte $LEFDE0-$LASFDE0 # FDE Length
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$LASFDE0:
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.4byte $LASFDE0-$Lframe0 # FDE CIE offset
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.4byte $LFB0 # FDE initial location
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.4byte $LFE0-$LFB0 # FDE address range
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.uleb128 0x0 # Augmentation size
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.byte 0x4 # DW_CFA_advance_loc4
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.4byte $LCFI0-$LFB0
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.byte 0xe # DW_CFA_def_cfa_offset
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.uleb128 0x18
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.byte 0x4 # DW_CFA_advance_loc4
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.4byte $LCFI2-$LCFI0
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.byte 0x11 # DW_CFA_offset_extended_sf
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.uleb128 0x1e # $fp
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.sleb128 -2 # SIZEOF_FRAME2 - 2*FFI_SIZEOF_ARG($sp)
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.byte 0x11 # DW_CFA_offset_extended_sf
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.uleb128 0x1f # $ra
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.sleb128 -1 # SIZEOF_FRAME2 - 1*FFI_SIZEOF_ARG($sp)
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.byte 0x4 # DW_CFA_advance_loc4
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.4byte $LCFI3-$LCFI2
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.byte 0xc # DW_CFA_def_cfa
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.uleb128 0x1e
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.uleb128 0x18
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.align 2
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$LEFDE0:
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$LSFDE1:
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.4byte $LEFDE1-$LASFDE1 # FDE Length
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$LASFDE1:
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.4byte $LASFDE1-$Lframe0 # FDE CIE offset
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.4byte $LFB1 # FDE initial location
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.4byte $LFE1-$LFB1 # FDE address range
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.uleb128 0x0 # Augmentation size
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.byte 0x4 # DW_CFA_advance_loc4
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.4byte $LCFI4-$LFB1
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.byte 0xe # DW_CFA_def_cfa_offset
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.uleb128 0x38
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.byte 0x4 # DW_CFA_advance_loc4
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.4byte $LCFI6-$LCFI4
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.byte 0x11 # DW_CFA_offset_extended_sf
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.uleb128 0x10 # $16
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.sleb128 -3 # SIZEOF_FRAME2 - 3*FFI_SIZEOF_ARG($sp)
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.byte 0x11 # DW_CFA_offset_extended_sf
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.uleb128 0x1e # $fp
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.sleb128 -2 # SIZEOF_FRAME2 - 2*FFI_SIZEOF_ARG($sp)
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.byte 0x11 # DW_CFA_offset_extended_sf
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.uleb128 0x1f # $ra
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.sleb128 -1 # SIZEOF_FRAME2 - 1*FFI_SIZEOF_ARG($sp)
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.byte 0x4 # DW_CFA_advance_loc4
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.4byte $LCFI7-$LCFI6
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.byte 0xc # DW_CFA_def_cfa
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.uleb128 0x1e
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.uleb128 0x38
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.align 2
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$LEFDE1:
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#endif
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