/* -----------------------------------------------------------------------
o32.S - Copyright (c) 1996, 1998, 2005 Red Hat, Inc.
MIPS 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>
/* Only build this code if we are compiling for o32 */
#if defined(FFI_MIPS_O32)
#define callback a0
#define bytes a2
#define flags a3
#define SIZEOF_FRAME (4 * FFI_SIZEOF_ARG + 2 * FFI_SIZEOF_ARG)
#define A3_OFF (SIZEOF_FRAME + 3 * FFI_SIZEOF_ARG)
#define FP_OFF (SIZEOF_FRAME - 2 * FFI_SIZEOF_ARG)
#define RA_OFF (SIZEOF_FRAME - 1 * FFI_SIZEOF_ARG)
.abicalls
.text
.align 2
.globl ffi_call_O32
.ent ffi_call_O32
ffi_call_O32:
$LFB0:
# Prologue
SUBU $sp, SIZEOF_FRAME # Frame size
$LCFI0:
REG_S $fp, FP_OFF($sp) # Save frame pointer
$LCFI1:
REG_S ra, RA_OFF($sp) # Save return address
$LCFI2:
move $fp, $sp
$LCFI3:
move t9, callback # callback function pointer
REG_S flags, A3_OFF($fp) # flags
# Allocate at least 4 words in the argstack
LI v0, 4 * FFI_SIZEOF_ARG
blt bytes, v0, sixteen
ADDU v0, bytes, 7 # make sure it is aligned
and v0, -8 # to an 8 byte boundry
sixteen:
SUBU $sp, v0 # move the stack pointer to reflect the
# arg space
ADDU a0, $sp, 4 * FFI_SIZEOF_ARG
jalr t9
REG_L t0, A3_OFF($fp) # load the flags word
SRL t2, t0, 4 # shift our arg info
and t0, ((1<<4)-1) # mask out the return type
ADDU $sp, 4 * FFI_SIZEOF_ARG # adjust $sp to new args
bnez t0, pass_d # make it quick for int
REG_L a0, 0*FFI_SIZEOF_ARG($sp) # just go ahead and load the
REG_L a1, 1*FFI_SIZEOF_ARG($sp) # four regs.
REG_L a2, 2*FFI_SIZEOF_ARG($sp)
REG_L a3, 3*FFI_SIZEOF_ARG($sp)
b call_it
pass_d:
bne t0, FFI_ARGS_D, pass_f
l.d $f12, 0*FFI_SIZEOF_ARG($sp) # load $fp regs from args
REG_L a2, 2*FFI_SIZEOF_ARG($sp) # passing a double
REG_L a3, 3*FFI_SIZEOF_ARG($sp)
b call_it
pass_f:
bne t0, FFI_ARGS_F, pass_d_d
l.s $f12, 0*FFI_SIZEOF_ARG($sp) # load $fp regs from args
REG_L a1, 1*FFI_SIZEOF_ARG($sp) # passing a float
REG_L a2, 2*FFI_SIZEOF_ARG($sp)
REG_L a3, 3*FFI_SIZEOF_ARG($sp)
b call_it
pass_d_d:
bne t0, FFI_ARGS_DD, pass_f_f
l.d $f12, 0*FFI_SIZEOF_ARG($sp) # load $fp regs from args
l.d $f14, 2*FFI_SIZEOF_ARG($sp) # passing two doubles
b call_it
pass_f_f:
bne t0, FFI_ARGS_FF, pass_d_f
l.s $f12, 0*FFI_SIZEOF_ARG($sp) # load $fp regs from args
l.s $f14, 1*FFI_SIZEOF_ARG($sp) # passing two floats
REG_L a2, 2*FFI_SIZEOF_ARG($sp)
REG_L a3, 3*FFI_SIZEOF_ARG($sp)
b call_it
pass_d_f:
bne t0, FFI_ARGS_DF, pass_f_d
l.d $f12, 0*FFI_SIZEOF_ARG($sp) # load $fp regs from args
l.s $f14, 2*FFI_SIZEOF_ARG($sp) # passing double and float
REG_L a3, 3*FFI_SIZEOF_ARG($sp)
b call_it
pass_f_d:
# assume that the only other combination must be float then double
# bne t0, FFI_ARGS_F_D, call_it
l.s $f12, 0*FFI_SIZEOF_ARG($sp) # load $fp regs from args
l.d $f14, 2*FFI_SIZEOF_ARG($sp) # passing double and float
call_it:
# Load the function pointer
REG_L t9, SIZEOF_FRAME + 5*FFI_SIZEOF_ARG($fp)
# If the return value pointer is NULL, assume no return value.
REG_L t1, SIZEOF_FRAME + 4*FFI_SIZEOF_ARG($fp)
beqz t1, noretval
bne t2, FFI_TYPE_INT, retlonglong
jalr t9
REG_L t0, SIZEOF_FRAME + 4*FFI_SIZEOF_ARG($fp)
REG_S v0, 0(t0)
b epilogue
retlonglong:
# Really any 64-bit int, signed or not.
bne t2, FFI_TYPE_UINT64, retfloat
jalr t9
REG_L t0, SIZEOF_FRAME + 4*FFI_SIZEOF_ARG($fp)
REG_S v1, 4(t0)
REG_S v0, 0(t0)
b epilogue
retfloat:
bne t2, FFI_TYPE_FLOAT, retdouble
jalr t9
REG_L t0, SIZEOF_FRAME + 4*FFI_SIZEOF_ARG($fp)
s.s $f0, 0(t0)
b epilogue
retdouble:
bne t2, FFI_TYPE_DOUBLE, noretval
jalr t9
REG_L t0, SIZEOF_FRAME + 4*FFI_SIZEOF_ARG($fp)
s.d $f0, 0(t0)
b epilogue
noretval:
jalr t9
# Epilogue
epilogue:
move $sp, $fp
REG_L $fp, FP_OFF($sp) # Restore frame pointer
REG_L ra, RA_OFF($sp) # Restore return address
ADDU $sp, SIZEOF_FRAME # Fix stack pointer
j ra
$LFE0:
.end ffi_call_O32
/* ffi_closure_O32. Expects address of the passed-in ffi_closure
in t4 ($12). Stores any arguments passed in registers onto the
stack, then calls ffi_closure_mips_inner_O32, which
then decodes them.
Stack layout:
3 - a3 save
2 - a2 save
1 - a1 save
0 - a0 save, original sp
-1 - ra save
-2 - fp save
-3 - $16 (s0) save
-4 - cprestore
-5 - return value high (v1)
-6 - return value low (v0)
-7 - f14 (le high, be low)
-8 - f14 (le low, be high)
-9 - f12 (le high, be low)
-10 - f12 (le low, be high)
-11 - Called function a3 save
-12 - Called function a2 save
-13 - Called function a1 save
-14 - Called function a0 save, our sp and fp point here
*/
#define SIZEOF_FRAME2 (14 * FFI_SIZEOF_ARG)
#define A3_OFF2 (SIZEOF_FRAME2 + 3 * FFI_SIZEOF_ARG)
#define A2_OFF2 (SIZEOF_FRAME2 + 2 * FFI_SIZEOF_ARG)
#define A1_OFF2 (SIZEOF_FRAME2 + 1 * FFI_SIZEOF_ARG)
#define A0_OFF2 (SIZEOF_FRAME2 + 0 * FFI_SIZEOF_ARG)
#define RA_OFF2 (SIZEOF_FRAME2 - 1 * FFI_SIZEOF_ARG)
#define FP_OFF2 (SIZEOF_FRAME2 - 2 * FFI_SIZEOF_ARG)
#define S0_OFF2 (SIZEOF_FRAME2 - 3 * FFI_SIZEOF_ARG)
#define GP_OFF2 (SIZEOF_FRAME2 - 4 * FFI_SIZEOF_ARG)
#define V1_OFF2 (SIZEOF_FRAME2 - 5 * FFI_SIZEOF_ARG)
#define V0_OFF2 (SIZEOF_FRAME2 - 6 * FFI_SIZEOF_ARG)
#define FA_1_1_OFF2 (SIZEOF_FRAME2 - 7 * FFI_SIZEOF_ARG)
#define FA_1_0_OFF2 (SIZEOF_FRAME2 - 8 * FFI_SIZEOF_ARG)
#define FA_0_1_OFF2 (SIZEOF_FRAME2 - 9 * FFI_SIZEOF_ARG)
#define FA_0_0_OFF2 (SIZEOF_FRAME2 - 10 * FFI_SIZEOF_ARG)
.text
.align 2
.globl ffi_closure_O32
.ent ffi_closure_O32
ffi_closure_O32:
$LFB1:
# Prologue
.frame $fp, SIZEOF_FRAME2, ra
.set noreorder
.cpload t9
.set reorder
SUBU $sp, SIZEOF_FRAME2
.cprestore GP_OFF2
$LCFI4:
REG_S $16, S0_OFF2($sp) # Save s0
REG_S $fp, FP_OFF2($sp) # Save frame pointer
REG_S ra, RA_OFF2($sp) # Save return address
$LCFI6:
move $fp, $sp
$LCFI7:
# Store all possible argument registers. If there are more than
# four arguments, then they are stored above where we put a3.
REG_S a0, A0_OFF2($fp)
REG_S a1, A1_OFF2($fp)
REG_S a2, A2_OFF2($fp)
REG_S a3, A3_OFF2($fp)
# Load ABI enum to s0
REG_L $16, 20($12) # cif pointer follows tramp.
REG_L $16, 0($16) # abi is first member.
li $13, 1 # FFI_O32
bne $16, $13, 1f # Skip fp save if FFI_O32_SOFT_FLOAT
# Store all possible float/double registers.
s.d $f12, FA_0_0_OFF2($fp)
s.d $f14, FA_1_0_OFF2($fp)
1:
# Call ffi_closure_mips_inner_O32 to do the work.
la t9, ffi_closure_mips_inner_O32
move a0, $12 # Pointer to the ffi_closure
addu a1, $fp, V0_OFF2
addu a2, $fp, A0_OFF2
addu a3, $fp, FA_0_0_OFF2
jalr t9
# Load the return value into the appropriate register.
move $8, $2
li $9, FFI_TYPE_VOID
beq $8, $9, closure_done
li $13, 1 # FFI_O32
bne $16, $13, 1f # Skip fp restore if FFI_O32_SOFT_FLOAT
li $9, FFI_TYPE_FLOAT
l.s $f0, V0_OFF2($fp)
beq $8, $9, closure_done
li $9, FFI_TYPE_DOUBLE
l.d $f0, V0_OFF2($fp)
beq $8, $9, closure_done
1:
REG_L $3, V1_OFF2($fp)
REG_L $2, V0_OFF2($fp)
closure_done:
# Epilogue
move $sp, $fp
REG_L $16, S0_OFF2($sp) # Restore s0
REG_L $fp, FP_OFF2($sp) # Restore frame pointer
REG_L ra, RA_OFF2($sp) # Restore return address
ADDU $sp, SIZEOF_FRAME2
j ra
$LFE1:
.end ffi_closure_O32
/* DWARF-2 unwind info. */
.section .eh_frame,"a",@progbits
$Lframe0:
.4byte $LECIE0-$LSCIE0 # Length of Common Information Entry
$LSCIE0:
.4byte 0x0 # CIE Identifier Tag
.byte 0x1 # CIE Version
.ascii "zR\0" # CIE Augmentation
.uleb128 0x1 # CIE Code Alignment Factor
.sleb128 4 # CIE Data Alignment Factor
.byte 0x1f # CIE RA Column
.uleb128 0x1 # Augmentation size
.byte 0x00 # FDE Encoding (absptr)
.byte 0xc # DW_CFA_def_cfa
.uleb128 0x1d
.uleb128 0x0
.align 2
$LECIE0:
$LSFDE0:
.4byte $LEFDE0-$LASFDE0 # FDE Length
$LASFDE0:
.4byte $LASFDE0-$Lframe0 # FDE CIE offset
.4byte $LFB0 # FDE initial location
.4byte $LFE0-$LFB0 # FDE address range
.uleb128 0x0 # Augmentation size
.byte 0x4 # DW_CFA_advance_loc4
.4byte $LCFI0-$LFB0
.byte 0xe # DW_CFA_def_cfa_offset
.uleb128 0x18
.byte 0x4 # DW_CFA_advance_loc4
.4byte $LCFI2-$LCFI0
.byte 0x11 # DW_CFA_offset_extended_sf
.uleb128 0x1e # $fp
.sleb128 -2 # SIZEOF_FRAME2 - 2*FFI_SIZEOF_ARG($sp)
.byte 0x11 # DW_CFA_offset_extended_sf
.uleb128 0x1f # $ra
.sleb128 -1 # SIZEOF_FRAME2 - 1*FFI_SIZEOF_ARG($sp)
.byte 0x4 # DW_CFA_advance_loc4
.4byte $LCFI3-$LCFI2
.byte 0xc # DW_CFA_def_cfa
.uleb128 0x1e
.uleb128 0x18
.align 2
$LEFDE0:
$LSFDE1:
.4byte $LEFDE1-$LASFDE1 # FDE Length
$LASFDE1:
.4byte $LASFDE1-$Lframe0 # FDE CIE offset
.4byte $LFB1 # FDE initial location
.4byte $LFE1-$LFB1 # FDE address range
.uleb128 0x0 # Augmentation size
.byte 0x4 # DW_CFA_advance_loc4
.4byte $LCFI4-$LFB1
.byte 0xe # DW_CFA_def_cfa_offset
.uleb128 0x38
.byte 0x4 # DW_CFA_advance_loc4
.4byte $LCFI6-$LCFI4
.byte 0x11 # DW_CFA_offset_extended_sf
.uleb128 0x10 # $16
.sleb128 -3 # SIZEOF_FRAME2 - 3*FFI_SIZEOF_ARG($sp)
.byte 0x11 # DW_CFA_offset_extended_sf
.uleb128 0x1e # $fp
.sleb128 -2 # SIZEOF_FRAME2 - 2*FFI_SIZEOF_ARG($sp)
.byte 0x11 # DW_CFA_offset_extended_sf
.uleb128 0x1f # $ra
.sleb128 -1 # SIZEOF_FRAME2 - 1*FFI_SIZEOF_ARG($sp)
.byte 0x4 # DW_CFA_advance_loc4
.4byte $LCFI7-$LCFI6
.byte 0xc # DW_CFA_def_cfa
.uleb128 0x1e
.uleb128 0x38
.align 2
$LEFDE1:
#endif
